patch-2.1.8 linux/drivers/block/ide-tape.c
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- Lines: 6729
- Date:
Wed Nov 6 14:49:31 1996
- Orig file:
v2.1.7/linux/drivers/block/ide-tape.c
- Orig date:
Tue Oct 29 19:58:03 1996
diff -u --recursive --new-file v2.1.7/linux/drivers/block/ide-tape.c linux/drivers/block/ide-tape.c
@@ -1,5 +1,5 @@
/*
- * linux/drivers/block/ide-tape.c Version 1.8 - ALPHA Sep 26, 1996
+ * linux/drivers/block/ide-tape.c Version 1.10 - BETA Nov 5, 1996
*
* Copyright (C) 1995, 1996 Gadi Oxman <gadio@netvision.net.il>
*
@@ -27,13 +27,16 @@
* The block device major and minor numbers are determined from the
* tape's relative position in the ide interfaces, as explained in ide.c.
*
- * The character device interface consists of two devices:
+ * The character device interface consists of the following devices:
*
- * ht0 major=37,minor=0 first IDE tape, rewind on close.
- * nht0 major=37,minor=128 first IDE tape, no rewind on close.
+ * ht0 major 37, minor 0 first IDE tape, rewind on close.
+ * ht1 major 37, minor 1 second IDE tape, rewind on close.
+ * ...
+ * nht0 major 37, minor 128 first IDE tape, no rewind on close.
+ * nht1 major 37, minor 129 second IDE tape, no rewind on close.
+ * ...
*
- * Run /usr/src/linux/scripts/MAKEDEV.ide to create the above entries.
- * We currently support only one ide tape drive.
+ * Run linux/scripts/MAKEDEV.ide to create the above entries.
*
* The general magnetic tape commands compatible interface, as defined by
* include/linux/mtio.h, is accessible through the character device.
@@ -49,13 +52,7 @@
* following scenario:
*
* 1. ide-tape is operating in the pipelined operation mode.
- * 2. All character device read/write requests consist of an
- * integral number of the tape's recommended data transfer unit
- * (which is shown on initialization and can be received with
- * an ioctl).
- * As of version 1.3 of the driver, this is no longer as critical
- * as it used to be.
- * 3. No buffering is performed by the user backup program.
+ * 2. No buffering is performed by the user backup program.
*
* Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
*
@@ -189,15 +186,22 @@
* Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model.
* Ver 1.8 Sep 26 96 Attempt to find a better balance between good
* interactive response and high system throughput.
- *
- * We are currently in an *alpha* stage. The driver is not complete and not
- * much tested. I would strongly suggest to:
- *
- * 1. Connect the tape to a separate interface and irq.
- * 2. Be truly prepared for a kernel crash and the resulting data loss.
- * 3. Don't rely too much on the resulting backups.
- *
- * Other than that, enjoy !
+ * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather
+ * than requiring an explicit FSF command.
+ * Abort pending requests at end of media.
+ * MTTELL was sometimes returning incorrect results.
+ * Return the real block size in the MTIOCGET ioctl.
+ * Some error recovery bug fixes.
+ * Ver 1.10 Nov 5 96 Major reorganization.
+ * Reduced CPU overhead a bit by eliminating internal
+ * bounce buffers.
+ * Added module support.
+ * Added multiple tape drives support.
+ * Added partition support.
+ * Rewrote DSC handling.
+ * Some portability fixes.
+ * Removed ide-tape.h.
+ * Additional minor changes.
*
* Here are some words from the first releases of hd.c, which are quoted
* in ide.c and apply here as well:
@@ -280,7 +284,7 @@
* pipelined mode might be the best option.
*
* You can enable/disable/tune the pipelined operation mode by adjusting
- * the compile time parameters in ide-tape.h.
+ * the compile time parameters below.
*/
/*
@@ -308,7 +312,7 @@
*/
#include <linux/config.h>
-#include <linux/hdreg.h>
+#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
@@ -328,167 +332,443 @@
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
+#include <asm/unaligned.h>
+#include <asm/bitops.h>
/*
* Main Linux ide driver include file
- *
- * Automatically includes our include file - ide-tape.h.
*/
-
-#include "ide.h"
+#include "ide.h"
/*
- * Supported ATAPI tape drives packet commands
+ * For general magnetic tape device compatibility.
*/
+#include <linux/mtio.h>
-#define IDETAPE_TEST_UNIT_READY_CMD 0x00
-#define IDETAPE_REWIND_CMD 0x01
-#define IDETAPE_REQUEST_SENSE_CMD 0x03
-#define IDETAPE_READ_CMD 0x08
-#define IDETAPE_WRITE_CMD 0x0a
-#define IDETAPE_WRITE_FILEMARK_CMD 0x10
-#define IDETAPE_SPACE_CMD 0x11
-#define IDETAPE_INQUIRY_CMD 0x12
-#define IDETAPE_ERASE_CMD 0x19
-#define IDETAPE_MODE_SENSE_CMD 0x1a
-#define IDETAPE_LOAD_UNLOAD_CMD 0x1b
-#define IDETAPE_LOCATE_CMD 0x2b
-#define IDETAPE_READ_POSITION_CMD 0x34
+/**************************** Tunable parameters *****************************/
/*
- * Some defines for the SPACE command
+ * Pipelined mode parameters.
+ *
+ * We try to use the minimum number of stages which is enough to
+ * keep the tape constantly streaming. To accomplish that, we implement
+ * a feedback loop around the maximum number of stages:
*
- * (The code field in the SPACE packet command).
+ * We start from MIN maximum stages (we will not even use MIN stages
+ * if we don't need them), increment it by RATE*(MAX-MIN)
+ * whenever we sense that the pipeline is empty, until we reach
+ * the optimum value or until we reach MAX.
+ *
+ * Setting the following parameter to 0 will disable the pipelined mode.
*/
-
-#define IDETAPE_SPACE_OVER_FILEMARK 1
-#define IDETAPE_SPACE_TO_EOD 3
+#define IDETAPE_MIN_PIPELINE_STAGES 100
+#define IDETAPE_MAX_PIPELINE_STAGES 200
+#define IDETAPE_INCREASE_STAGES_RATE 20
/*
- * Some defines for the LOAD UNLOAD command
+ * Assuming the tape shares an interface with another device, the default
+ * behavior is to service our pending pipeline requests as soon as
+ * possible, but to gracefully postpone them in favor of the other device
+ * when the tape is busy. This has the potential to maximize our
+ * throughput and in the same time, to make efficient use of the IDE bus.
+ *
+ * Note that when we transfer data to / from the tape, we co-operate with
+ * the relatively fast tape buffers and the tape will perform the
+ * actual media access in the background, without blocking the IDE
+ * bus. This means that as long as the maximum IDE bus throughput is much
+ * higher than the sum of our maximum throughput and the maximum
+ * throughput of the other device, we should probably leave the default
+ * behavior.
+ *
+ * However, if it is still desired to give the other device a share even
+ * in our own (small) bus bandwidth, you can set IDETAPE_LOW_TAPE_PRIORITY
+ * to 1. This will let the other device finish *all* its pending requests
+ * before we even check if we can service our next pending request.
*/
-
-#define IDETAPE_LU_LOAD_MASK 1
-#define IDETAPE_LU_RETENSION_MASK 2
-#define IDETAPE_LU_EOT_MASK 4
+#define IDETAPE_LOW_TAPE_PRIORITY 0
/*
- * Our ioctls - We will use 0x034n and 0x035n
+ * The following are used to debug the driver:
+ *
+ * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
+ * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in
+ * some places.
+ *
+ * Setting them to 0 will restore normal operation mode:
*
- * Nothing special meanwhile.
- * mtio.h MTIOCTOP compatible commands are supported on the character
- * device interface.
+ * 1. Disable logging normal successful operations.
+ * 2. Disable self-sanity checks.
+ * 3. Errors will still be logged, of course.
+ *
+ * All the #if DEBUG code will be removed some day, when the driver
+ * is verified to be stable enough. This will make it much more
+ * esthetic.
*/
+#define IDETAPE_DEBUG_LOG 0
+#define IDETAPE_DEBUG_BUGS 1
/*
- * Special requests for our block device strategy routine.
- *
- * In order to service a character device command, we add special
- * requests to the tail of our block device request queue and wait
- * for their completion.
+ * After each failed packet command we issue a request sense command
+ * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
*
+ * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
*/
+#define IDETAPE_MAX_PC_RETRIES 3
-#define IDETAPE_FIRST_REQUEST 90
+/*
+ * With each packet command, we allocate a buffer of
+ * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
+ * commands (Not for READ/WRITE commands).
+ */
+#define IDETAPE_PC_BUFFER_SIZE 256
/*
- * IDETAPE_PACKET_COMMAND_REQUEST_TYPE1 is used to queue a packet command
- * in the request queue. We will wait for DSC before issuing the command
- * if it is still not set. In that case, we will temporary replace the
- * cmd field to type 2 and restore it back to type 1 when we receive DSC
- * and can start with sending the command.
+ * In various places in the driver, we need to allocate storage
+ * for packet commands and requests, which will remain valid while
+ * we leave the driver to wait for an interrupt or a timeout event.
*/
-
-#define IDETAPE_PACKET_COMMAND_REQUEST_TYPE1 90
-#define IDETAPE_PACKET_COMMAND_REQUEST_TYPE2 91
+#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
/*
- * IDETAPE_READ_REQUEST and IDETAPE_WRITE_REQUEST are used by our
- * character device interface to request read/write operations from
- * our block device interface.
+ * DSC polling parameters.
+ *
+ * Polling for DSC (a single bit in the status register) is a very
+ * important function in ide-tape. There are two cases in which we
+ * poll for DSC:
*
- * In case a read or write request was requested by the buffer cache
- * and not by our character device interface, the cmd field in the
- * request will contain READ and WRITE instead.
+ * 1. Before a read/write packet command, to ensure that we
+ * can transfer data from/to the tape's data buffers, without
+ * causing an actual media access. In case the tape is not
+ * ready yet, we take out our request from the device
+ * request queue, so that ide.c will service requests from
+ * the other device on the same interface meanwhile.
*
- * We handle both cases in a similar way. The main difference is that
- * in our own requests, buffer head is NULL and idetape_end_request
- * will update the errors field if the request was not completed.
+ * 2. After the successful initialization of a "media access
+ * packet command", which is a command which can take a long
+ * time to complete (it can be several seconds or even an hour).
+ *
+ * Again, we postpone our request in the middle to free the bus
+ * for the other device. The polling frequency here should be
+ * lower than the read/write frequency since those media access
+ * commands are slow. We start from a "fast" frequency -
+ * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
+ * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
+ * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
+ *
+ * We also set a timeout for the timer, in case something goes wrong.
+ * The timeout should be longer then the maximum execution time of a
+ * tape operation.
+ */
+
+/*
+ * The following parameter is used to select the point in the internal
+ * tape fifo in which we will start to refill the buffer. Decreasing
+ * the following parameter will improve the system's latency and
+ * interactive response, while using a high value might improve sytem
+ * throughput.
+ */
+#define IDETAPE_FIFO_THRESHOLD 2
+
+/*
+ * DSC timings.
*/
+#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
+#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
+#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
+#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
+#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
+#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
+#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
-#define IDETAPE_READ_REQUEST 92
-#define IDETAPE_WRITE_REQUEST 93
+/*************************** End of tunable parameters ***********************/
-#define IDETAPE_LAST_REQUEST 93
+typedef enum {
+ idetape_direction_none,
+ idetape_direction_read,
+ idetape_direction_write
+} idetape_chrdev_direction_t;
/*
- * A macro which can be used to check if a we support a given
- * request command.
+ * Our view of a packet command.
*/
+typedef struct idetape_packet_command_s {
+ u8 c[12]; /* Actual packet bytes */
+ int retries; /* On each retry, we increment retries */
+ int error; /* Error code */
+ int request_transfer; /* Bytes to transfer */
+ int actually_transferred; /* Bytes actually transferred */
+ int buffer_size; /* Size of our data buffer */
+ struct buffer_head *bh;
+ char *b_data;
+ int b_count;
+ byte *buffer; /* Data buffer */
+ byte *current_position; /* Pointer into the above buffer */
+ void (*callback) (ide_drive_t *); /* Called when this packet command is completed */
+ byte pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
+ unsigned int flags; /* Status/Action bit flags */
+} idetape_pc_t;
-#define IDETAPE_REQUEST_CMD(cmd) ((cmd >= IDETAPE_FIRST_REQUEST) && (cmd <= IDETAPE_LAST_REQUEST))
+/*
+ * Packet command flag bits.
+ */
+#define PC_ABORT 0 /* Set when an error is considered normal - We won't retry */
+#define PC_WAIT_FOR_DSC 1 /* 1 When polling for DSC on a media access command */
+#define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */
+#define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */
+#define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */
+#define PC_WRITING 5 /* Data direction */
/*
- * We are now able to postpone an idetape request in the stage
- * where it is polling for DSC and service requests from the other
- * ide device meanwhile.
+ * Capabilities and Mechanical Status Page
+ */
+typedef struct {
+ unsigned page_code :6; /* Page code - Should be 0x2a */
+ unsigned reserved1_67 :2;
+ u8 page_length; /* Page Length - Should be 0x12 */
+ u8 reserved2, reserved3;
+ unsigned ro :1; /* Read Only Mode */
+ unsigned reserved4_1234 :4;
+ unsigned sprev :1; /* Supports SPACE in the reverse direction */
+ unsigned reserved4_67 :2;
+ unsigned reserved5_012 :3;
+ unsigned efmt :1; /* Supports ERASE command initiated formatting */
+ unsigned reserved5_4 :1;
+ unsigned qfa :1; /* Supports the QFA two partition formats */
+ unsigned reserved5_67 :2;
+ unsigned lock :1; /* Supports locking the volume */
+ unsigned locked :1; /* The volume is locked */
+ unsigned prevent :1; /* The device defaults in the prevent state after power up */
+ unsigned eject :1; /* The device can eject the volume */
+ unsigned reserved6_45 :2; /* Reserved */
+ unsigned ecc :1; /* Supports error correction */
+ unsigned cmprs :1; /* Supports data compression */
+ unsigned reserved7_0 :1;
+ unsigned blk512 :1; /* Supports 512 bytes block size */
+ unsigned blk1024 :1; /* Supports 1024 bytes block size */
+ unsigned reserved7_3_6 :4;
+ unsigned slowb :1; /* The device restricts the byte count for PIO */
+ /* transfers for slow buffer memory ??? */
+ u16 max_speed; /* Maximum speed supported in KBps */
+ u8 reserved10, reserved11;
+ u16 ctl; /* Continuous Transfer Limit in blocks */
+ u16 speed; /* Current Speed, in KBps */
+ u16 buffer_size; /* Buffer Size, in 512 bytes */
+ u8 reserved18, reserved19;
+} idetape_capabilities_page_t;
+
+/*
+ * A pipeline stage.
+ */
+typedef struct idetape_stage_s {
+ struct request rq; /* The corresponding request */
+ struct buffer_head *bh; /* The data buffers */
+ struct idetape_stage_s *next; /* Pointer to the next stage */
+} idetape_stage_t;
+
+/*
+ * Most of our global data which we need to save even as we leave the
+ * driver due to an interrupt or a timer event is stored in a variable
+ * of type idetape_tape_t, defined below.
*/
+typedef struct {
+ ide_drive_t *drive;
-#define IDETAPE_RQ_POSTPONED 0x1234
+ /*
+ * Since a typical character device operation requires more
+ * than one packet command, we provide here enough memory
+ * for the maximum of interconnected packet commands.
+ * The packet commands are stored in the circular array pc_stack.
+ * pc_stack_index points to the last used entry, and warps around
+ * to the start when we get to the last array entry.
+ *
+ * pc points to the current processed packet command.
+ *
+ * failed_pc points to the last failed packet command, or contains
+ * NULL if we do not need to retry any packet command. This is
+ * required since an additional packet command is needed before the
+ * retry, to get detailed information on what went wrong.
+ */
+ idetape_pc_t *pc; /* Current packet command */
+ idetape_pc_t *failed_pc; /* Last failed packet command */
+ idetape_pc_t pc_stack[IDETAPE_PC_STACK];/* Packet command stack */
+ int pc_stack_index; /* Next free packet command storage space */
+ struct request rq_stack[IDETAPE_PC_STACK];
+ int rq_stack_index; /* We implement a circular array */
+
+ /*
+ * DSC polling variables.
+ *
+ * While polling for DSC we use postponed_rq to postpone the
+ * current request so that ide.c will be able to service
+ * pending requests on the other device. Note that at most
+ * we will have only one DSC (usually data transfer) request
+ * in the device request queue. Additional requests can be
+ * queued in our internal pipeline, but they will be visible
+ * to ide.c only one at a time.
+ */
+ struct request *postponed_rq;
+ unsigned long dsc_polling_start; /* The time in which we started polling for DSC */
+ struct timer_list dsc_timer; /* Timer used to poll for dsc */
+ unsigned long best_dsc_rw_frequency; /* Read/Write dsc polling frequency */
+ unsigned long dsc_polling_frequency; /* The current polling frequency */
+ unsigned long dsc_timeout; /* Maximum waiting time */
+
+ /*
+ * Position information
+ */
+ byte partition;
+ unsigned int block_address; /* Current block */
+
+ /*
+ * Last error information
+ */
+ byte sense_key, asc, ascq;
+
+ /*
+ * Character device operation
+ */
+ unsigned int minor;
+ char name[4]; /* device name */
+ idetape_chrdev_direction_t chrdev_direction; /* Current character device data transfer direction */
+
+ /*
+ * Device information
+ */
+ unsigned short tape_block_size; /* Usually 512 or 1024 bytes */
+ int user_bs_factor;
+ idetape_capabilities_page_t capabilities; /* Copy of the tape's Capabilities and Mechanical Page */
+
+ /*
+ * Active data transfer request parameters.
+ *
+ * At most, there is only one ide-tape originated data transfer
+ * request in the device request queue. This allows ide.c to
+ * easily service requests from the other device when we
+ * postpone our active request. In the pipelined operation
+ * mode, we use our internal pipeline structure to hold
+ * more data requests.
+ *
+ * The data buffer size is chosen based on the tape's
+ * recommendation.
+ */
+ struct request *active_data_request; /* Pointer to the request which is waiting in the device request queue */
+ int stage_size; /* Data buffer size (chosen based on the tape's recommendation */
+ idetape_stage_t *merge_stage;
+ int merge_stage_size;
+ struct buffer_head *bh;
+ char *b_data;
+ int b_count;
+
+ /*
+ * Pipeline parameters.
+ *
+ * To accomplish non-pipelined mode, we simply set the following
+ * variables to zero (or NULL, where appropriate).
+ */
+ int nr_stages; /* Number of currently used stages */
+ int nr_pending_stages; /* Number of pending stages */
+ int max_stages; /* We will not allocate more than this number of stages */
+ idetape_stage_t *first_stage; /* The first stage which will be removed from the pipeline */
+ idetape_stage_t *active_stage; /* The currently active stage */
+ idetape_stage_t *next_stage; /* Will be serviced after the currently active request */
+ idetape_stage_t *last_stage; /* New requests will be added to the pipeline here */
+ idetape_stage_t *cache_stage; /* Optional free stage which we can use */
+ int pages_per_stage;
+ int excess_bh_size; /* Wasted space in each stage */
+
+ unsigned int flags; /* Status/Action flags */
+} idetape_tape_t;
+
+/*
+ * Tape flag bits values.
+ */
+#define IDETAPE_IGNORE_DSC 0
+#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
+#define IDETAPE_BUSY 2 /* Device already opened */
+#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
+#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
+#define IDETAPE_FILEMARK 5 /* Currently on a filemark */
/*
- * Error codes which are returned in rq->errors to the higher part
- * of the driver.
+ * Supported ATAPI tape drives packet commands
*/
-
-#define IDETAPE_RQ_ERROR_GENERAL 1
-#define IDETAPE_RQ_ERROR_FILEMARK 2
-#define IDETAPE_RQ_ERROR_EOD 3
+#define IDETAPE_TEST_UNIT_READY_CMD 0x00
+#define IDETAPE_REWIND_CMD 0x01
+#define IDETAPE_REQUEST_SENSE_CMD 0x03
+#define IDETAPE_READ_CMD 0x08
+#define IDETAPE_WRITE_CMD 0x0a
+#define IDETAPE_WRITE_FILEMARK_CMD 0x10
+#define IDETAPE_SPACE_CMD 0x11
+#define IDETAPE_INQUIRY_CMD 0x12
+#define IDETAPE_ERASE_CMD 0x19
+#define IDETAPE_MODE_SENSE_CMD 0x1a
+#define IDETAPE_LOAD_UNLOAD_CMD 0x1b
+#define IDETAPE_LOCATE_CMD 0x2b
+#define IDETAPE_READ_POSITION_CMD 0x34
/*
- * ATAPI Task File Registers (Re-definition of the ATA Task File
- * Registers for an ATAPI packet command).
- * From Table 3-2 of QIC-157C.
+ * Some defines for the SPACE command
*/
+#define IDETAPE_SPACE_OVER_FILEMARK 1
+#define IDETAPE_SPACE_TO_EOD 3
-/* Read Access */
+/*
+ * Some defines for the LOAD UNLOAD command
+ */
+#define IDETAPE_LU_LOAD_MASK 1
+#define IDETAPE_LU_RETENSION_MASK 2
+#define IDETAPE_LU_EOT_MASK 4
-#define IDETAPE_DATA_OFFSET (0)
-#define IDETAPE_ERROR_OFFSET (1)
-#define IDETAPE_IREASON_OFFSET (2)
-#define IDETAPE_RESERVED3_OFFSET (3)
-#define IDETAPE_BCOUNTL_OFFSET (4)
-#define IDETAPE_BCOUNTH_OFFSET (5)
-#define IDETAPE_DRIVESEL_OFFSET (6)
-#define IDETAPE_STATUS_OFFSET (7)
+/*
+ * Special requests for our block device strategy routine.
+ *
+ * In order to service a character device command, we add special
+ * requests to the tail of our block device request queue and wait
+ * for their completion.
+ *
+ */
+#define IDETAPE_FIRST_RQ 90
-#define IDETAPE_DATA_REG (HWIF(drive)->io_base+IDETAPE_DATA_OFFSET)
-#define IDETAPE_ERROR_REG (HWIF(drive)->io_base+IDETAPE_ERROR_OFFSET)
-#define IDETAPE_IREASON_REG (HWIF(drive)->io_base+IDETAPE_IREASON_OFFSET)
-#define IDETAPE_RESERVED3_REG (HWIF(drive)->io_base+IDETAPE_RESERVED3_OFFSET)
-#define IDETAPE_BCOUNTL_REG (HWIF(drive)->io_base+IDETAPE_BCOUNTL_OFFSET)
-#define IDETAPE_BCOUNTH_REG (HWIF(drive)->io_base+IDETAPE_BCOUNTH_OFFSET)
-#define IDETAPE_DRIVESEL_REG (HWIF(drive)->io_base+IDETAPE_DRIVESEL_OFFSET)
-#define IDETAPE_STATUS_REG (HWIF(drive)->io_base+IDETAPE_STATUS_OFFSET)
+/*
+ * IDETAPE_PC_RQ is used to queue a packet command in the request queue.
+ */
+#define IDETAPE_PC_RQ 90
-/* Write Access */
+/*
+ * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our
+ * character device interface to request read/write operations from
+ * our block device interface.
+ */
+#define IDETAPE_READ_RQ 92
+#define IDETAPE_WRITE_RQ 93
+#define IDETAPE_ABORTED_WRITE_RQ 94
-#define IDETAPE_FEATURES_OFFSET (1)
-#define IDETAPE_ATACOMMAND_OFFSET (7)
+#define IDETAPE_LAST_RQ 94
-#define IDETAPE_FEATURES_REG (HWIF(drive)->io_base+IDETAPE_FEATURES_OFFSET)
-#define IDETAPE_ATACOMMAND_REG (HWIF(drive)->io_base+IDETAPE_ATACOMMAND_OFFSET)
-#define IDETAPE_CONTROL_REG (HWIF(drive)->ctl_port)
+/*
+ * A macro which can be used to check if a we support a given
+ * request command.
+ */
+#define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ))
+/*
+ * We are now able to postpone an idetape request in the stage
+ * where it is polling for DSC and service requests from the other
+ * ide device meanwhile.
+ */
+#define IDETAPE_RQ_POSTPONED 0x1234
/*
- * Structure of the various task file registers
+ * Error codes which are returned in rq->errors to the higher part
+ * of the driver.
*/
+#define IDETAPE_ERROR_GENERAL 101
+#define IDETAPE_ERROR_FILEMARK 102
+#define IDETAPE_ERROR_EOD 103
/*
* The ATAPI Status Register.
*/
-
typedef union {
unsigned all :8;
struct {
@@ -496,11 +776,9 @@
unsigned idx :1; /* Reserved */
unsigned corr :1; /* Correctable error occurred */
unsigned drq :1; /* Data is request by the device */
- unsigned dsc :1; /* Set when a media access command is finished */
- /* Reads / Writes are NOT media access commands */
+ unsigned dsc :1; /* Buffer availability / Media access command finished */
unsigned reserved5 :1; /* Reserved */
- unsigned drdy :1; /* Ignored for ATAPI commands */
- /* (The device is ready to accept ATA command) */
+ unsigned drdy :1; /* Ignored for ATAPI commands (ready to accept ATA command) */
unsigned bsy :1; /* The device has access to the command block */
} b;
} idetape_status_reg_t;
@@ -508,7 +786,6 @@
/*
* The ATAPI error register.
*/
-
typedef union {
unsigned all :8;
struct {
@@ -523,7 +800,6 @@
/*
* ATAPI Feature Register
*/
-
typedef union {
unsigned all :8;
struct {
@@ -537,7 +813,6 @@
/*
* ATAPI Byte Count Register.
*/
-
typedef union {
unsigned all :16;
struct {
@@ -549,7 +824,6 @@
/*
* ATAPI Interrupt Reason Register.
*/
-
typedef union {
unsigned all :8;
struct {
@@ -562,7 +836,6 @@
/*
* ATAPI Drive Select Register
*/
-
typedef union {
unsigned all :8;
struct {
@@ -577,7 +850,6 @@
/*
* ATAPI Device Control Register
*/
-
typedef union {
unsigned all :8;
struct {
@@ -593,126 +865,91 @@
* idetape_chrdev_t provides the link between out character device
* interface and our block device interface and the corresponding
* ide_drive_t structure.
- *
- * We currently support only one tape drive.
- *
*/
-
typedef struct {
ide_drive_t *drive;
- int major,minor;
- char name[4];
} idetape_chrdev_t;
/*
* The following is used to format the general configuration word of
* the ATAPI IDENTIFY DEVICE command.
*/
-
struct idetape_id_gcw {
-
- unsigned packet_size :2; /* Packet Size */
- unsigned reserved2 :1; /* Reserved */
- unsigned reserved3 :1; /* Reserved */
- unsigned reserved4 :1; /* Reserved */
- unsigned drq_type :2; /* Command packet DRQ type */
- unsigned removable :1; /* Removable media */
- unsigned device_type :5; /* Device type */
- unsigned reserved13 :1; /* Reserved */
- unsigned protocol :2; /* Protocol type */
+ unsigned packet_size :2; /* Packet Size */
+ unsigned reserved234 :3; /* Reserved */
+ unsigned drq_type :2; /* Command packet DRQ type */
+ unsigned removable :1; /* Removable media */
+ unsigned device_type :5; /* Device type */
+ unsigned reserved13 :1; /* Reserved */
+ unsigned protocol :2; /* Protocol type */
};
/*
* INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
*/
-
typedef struct {
- unsigned device_type :5; /* Peripheral Device Type */
- unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
- unsigned reserved1_6t0 :7; /* Reserved */
- unsigned rmb :1; /* Removable Medium Bit */
- unsigned ansi_version :3; /* ANSI Version */
- unsigned ecma_version :3; /* ECMA Version */
- unsigned iso_version :2; /* ISO Version */
- unsigned response_format :4; /* Response Data Format */
- unsigned reserved3_45 :2; /* Reserved */
- unsigned reserved3_6 :1; /* TrmIOP - Reserved */
- unsigned reserved3_7 :1; /* AENC - Reserved */
- byte additional_length; /* Additional Length (total_length-4) */
- byte reserved_5; /* Reserved */
- byte reserved_6; /* Reserved */
- unsigned reserved7_0 :1; /* SftRe - Reserved */
- unsigned reserved7_1 :1; /* CmdQue - Reserved */
- unsigned reserved7_2 :1; /* Reserved */
- unsigned reserved7_3 :1; /* Linked - Reserved */
- unsigned reserved7_4 :1; /* Sync - Reserved */
- unsigned reserved7_5 :1; /* WBus16 - Reserved */
- unsigned reserved7_6 :1; /* WBus32 - Reserved */
- unsigned reserved7_7 :1; /* RelAdr - Reserved */
- byte vendor_id [8]; /* Vendor Identification */
- byte product_id [16]; /* Product Identification */
- byte revision_level [4]; /* Revision Level */
- byte vendor_specific [20]; /* Vendor Specific - Optional */
- byte reserved56t95 [40]; /* Reserved - Optional */
-
- /* Additional information may be returned */
+ unsigned device_type :5; /* Peripheral Device Type */
+ unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
+ unsigned reserved1_6t0 :7; /* Reserved */
+ unsigned rmb :1; /* Removable Medium Bit */
+ unsigned ansi_version :3; /* ANSI Version */
+ unsigned ecma_version :3; /* ECMA Version */
+ unsigned iso_version :2; /* ISO Version */
+ unsigned response_format :4; /* Response Data Format */
+ unsigned reserved3_45 :2; /* Reserved */
+ unsigned reserved3_6 :1; /* TrmIOP - Reserved */
+ unsigned reserved3_7 :1; /* AENC - Reserved */
+ u8 additional_length; /* Additional Length (total_length-4) */
+ u8 rsv5, rsv6, rsv7; /* Reserved */
+ u8 vendor_id[8]; /* Vendor Identification */
+ u8 product_id[16]; /* Product Identification */
+ u8 revision_level[4]; /* Revision Level */
+ u8 vendor_specific[20]; /* Vendor Specific - Optional */
+ u8 reserved56t95[40]; /* Reserved - Optional */
+ /* Additional information may be returned */
} idetape_inquiry_result_t;
/*
* READ POSITION packet command - Data Format (From Table 6-57)
*/
-
typedef struct {
- unsigned reserved0_10 :2; /* Reserved */
- unsigned bpu :1; /* Block Position Unknown */
- unsigned reserved0_543 :3; /* Reserved */
- unsigned eop :1; /* End Of Partition */
- unsigned bop :1; /* Beginning Of Partition */
- byte partition_num; /* Partition Number */
- byte reserved_2; /* Reserved */
- byte reserved_3; /* Reserved */
- unsigned long first_block; /* First Block Location */
- unsigned long last_block; /* Last Block Location (Optional) */
- byte reserved_12; /* Reserved */
- byte blocks_in_buffer_2; /* Blocks In Buffer - MSB (Optional) */
- byte blocks_in_buffer_1;
- byte blocks_in_buffer_0; /* Blocks In Buffer - LSB (Optional) */
- unsigned long bytes_in_buffer; /* Bytes In Buffer (Optional) */
+ unsigned reserved0_10 :2; /* Reserved */
+ unsigned bpu :1; /* Block Position Unknown */
+ unsigned reserved0_543 :3; /* Reserved */
+ unsigned eop :1; /* End Of Partition */
+ unsigned bop :1; /* Beginning Of Partition */
+ u8 partition; /* Partition Number */
+ u8 reserved2, reserved3; /* Reserved */
+ u32 first_block; /* First Block Location */
+ u32 last_block; /* Last Block Location (Optional) */
+ u8 reserved12; /* Reserved */
+ u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
+ u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
} idetape_read_position_result_t;
/*
* REQUEST SENSE packet command result - Data Format.
*/
-
typedef struct {
- unsigned error_code :7; /* Current of deferred errors */
- unsigned valid :1; /* The information field conforms to QIC-157C */
- unsigned reserved_1 :8; /* Segment Number - Reserved */
- unsigned sense_key :4; /* Sense Key */
- unsigned reserved2_4 :1; /* Reserved */
- unsigned ili :1; /* Incorrect Length Indicator */
- unsigned eom :1; /* End Of Medium */
- unsigned filemark :1; /* Filemark */
-
- /*
- * We can't use a 32 bit variable, since it will be re-aligned
- * by GCC, as we are not on a 32 bit boundary.
- */
-
- byte information1; /* MSB - Information - Command specific */
- byte information2;
- byte information3;
- byte information4; /* LSB */
- byte asl; /* Additional sense length (n-7) */
- unsigned long command_specific; /* Additional command specific information */
- byte asc; /* Additional Sense Code */
- byte ascq; /* Additional Sense Code Qualifier */
- byte replaceable_unit_code; /* Field Replaceable Unit Code */
- unsigned sk_specific1 :7; /* Sense Key Specific */
- unsigned sksv :1; /* Sense Key Specific information is valid */
- byte sk_specific2; /* Sense Key Specific */
- byte sk_specific3; /* Sense Key Specific */
- byte pad [2]; /* Padding to 20 bytes */
+ unsigned error_code :7; /* Current of deferred errors */
+ unsigned valid :1; /* The information field conforms to QIC-157C */
+ u8 reserved1 :8; /* Segment Number - Reserved */
+ unsigned sense_key :4; /* Sense Key */
+ unsigned reserved2_4 :1; /* Reserved */
+ unsigned ili :1; /* Incorrect Length Indicator */
+ unsigned eom :1; /* End Of Medium */
+ unsigned filemark :1; /* Filemark */
+ u32 information __attribute__ ((packed));
+ u8 asl; /* Additional sense length (n-7) */
+ u32 command_specific; /* Additional command specific information */
+ u8 asc; /* Additional Sense Code */
+ u8 ascq; /* Additional Sense Code Qualifier */
+ u8 replaceable_unit_code; /* Field Replaceable Unit Code */
+ unsigned sk_specific1 :7; /* Sense Key Specific */
+ unsigned sksv :1; /* Sense Key Specific information is valid */
+ u8 sk_specific2; /* Sense Key Specific */
+ u8 sk_specific3; /* Sense Key Specific */
+ u8 pad[2]; /* Padding to 20 bytes */
} idetape_request_sense_result_t;
/*
@@ -720,19 +957,16 @@
* packet commands. Those packet commands are still not supported
* by ide-tape.
*/
-
#define IDETAPE_CAPABILITIES_PAGE 0x2a
/*
* Mode Parameter Header for the MODE SENSE packet command
*/
-
typedef struct {
- byte mode_data_length; /* The length of the following data that is */
- /* available to be transferred */
- byte medium_type; /* Medium Type */
- byte dsp; /* Device Specific Parameter */
- byte bdl; /* Block Descriptor Length */
+ u8 mode_data_length; /* Length of the following data transfer */
+ u8 medium_type; /* Medium Type */
+ u8 dsp; /* Device Specific Parameter */
+ u8 bdl; /* Block Descriptor Length */
} idetape_mode_parameter_header_t;
/*
@@ -740,1708 +974,684 @@
*
* Support for block descriptors is optional.
*/
-
typedef struct {
- byte density_code; /* Medium density code */
- byte blocks1; /* Number of blocks - MSB */
- byte blocks2; /* Number of blocks - Middle byte */
- byte blocks3; /* Number of blocks - LSB */
- byte reserved4; /* Reserved */
- byte length1; /* Block Length - MSB */
- byte length2; /* Block Length - Middle byte */
- byte length3; /* Block Length - LSB */
+ u8 density_code; /* Medium density code */
+ u8 blocks[3]; /* Number of blocks */
+ u8 reserved4; /* Reserved */
+ u8 length[3]; /* Block Length */
} idetape_parameter_block_descriptor_t;
/*
* The Data Compression Page, as returned by the MODE SENSE packet command.
*/
-
typedef struct {
- unsigned page_code :6; /* Page Code - Should be 0xf */
- unsigned reserved :1; /* Reserved */
- unsigned ps :1;
- byte page_length; /* Page Length - Should be 14 */
- unsigned reserved2 :6; /* Reserved */
- unsigned dcc :1; /* Data Compression Capable */
- unsigned dce :1; /* Data Compression Enable */
- unsigned reserved3 :5; /* Reserved */
- unsigned red :2; /* Report Exception on Decompression */
- unsigned dde :1; /* Data Decompression Enable */
- unsigned long ca; /* Compression Algorithm */
- unsigned long da; /* Decompression Algorithm */
- byte reserved_12; /* Reserved */
- byte reserved_13; /* Reserved */
- byte reserved_14; /* Reserved */
- byte reserved_15; /* Reserved */
+ unsigned page_code :6; /* Page Code - Should be 0xf */
+ unsigned reserved0 :1; /* Reserved */
+ unsigned ps :1;
+ u8 page_length; /* Page Length - Should be 14 */
+ unsigned reserved2 :6; /* Reserved */
+ unsigned dcc :1; /* Data Compression Capable */
+ unsigned dce :1; /* Data Compression Enable */
+ unsigned reserved3 :5; /* Reserved */
+ unsigned red :2; /* Report Exception on Decompression */
+ unsigned dde :1; /* Data Decompression Enable */
+ u32 ca; /* Compression Algorithm */
+ u32 da; /* Decompression Algorithm */
+ u8 reserved[4]; /* Reserved */
} idetape_data_compression_page_t;
/*
* The Medium Partition Page, as returned by the MODE SENSE packet command.
*/
-
typedef struct {
- unsigned page_code :6; /* Page Code - Should be 0x11 */
- unsigned reserved1_6 :1; /* Reserved */
- unsigned ps :1;
- byte page_length; /* Page Length - Should be 6 */
- byte map; /* Maximum Additional Partitions - Should be 0 */
- byte apd; /* Additional Partitions Defined - Should be 0 */
- unsigned reserved4_012 :3; /* Reserved */
- unsigned psum :2; /* Should be 0 */
- unsigned idp :1; /* Should be 0 */
- unsigned sdp :1; /* Should be 0 */
- unsigned fdp :1; /* Fixed Data Partitions */
- byte mfr; /* Medium Format Recognition */
- byte reserved6; /* Reserved */
- byte reserved7; /* Reserved */
+ unsigned page_code :6; /* Page Code - Should be 0x11 */
+ unsigned reserved1_6 :1; /* Reserved */
+ unsigned ps :1;
+ u8 page_length; /* Page Length - Should be 6 */
+ u8 map; /* Maximum Additional Partitions - Should be 0 */
+ u8 apd; /* Additional Partitions Defined - Should be 0 */
+ unsigned reserved4_012 :3; /* Reserved */
+ unsigned psum :2; /* Should be 0 */
+ unsigned idp :1; /* Should be 0 */
+ unsigned sdp :1; /* Should be 0 */
+ unsigned fdp :1; /* Fixed Data Partitions */
+ u8 mfr; /* Medium Format Recognition */
+ u8 reserved[2]; /* Reserved */
} idetape_medium_partition_page_t;
-/*
- * Prototypes of various functions in ide-tape.c
- *
- * The following functions are called from ide.c, and their prototypes
- * are available in ide.h:
- *
- * idetape_identify_device
- * idetape_setup
- * idetape_blkdev_ioctl
- * idetape_do_request
- * idetape_blkdev_open
- * idetape_blkdev_release
- * idetape_register_chrdev (void);
- */
-
-/*
- * The following functions are used to transfer data from / to the
- * tape's data register.
- */
-
-void idetape_input_data (ide_drive_t *drive,void *buffer, unsigned long bcount);
-void idetape_output_data (ide_drive_t *drive,void *buffer, unsigned long bcount);
-void idetape_discard_data (ide_drive_t *drive, unsigned long bcount);
-
-/*
- * Packet command related functions.
- */
-
-void idetape_issue_packet_command (ide_drive_t *drive,idetape_packet_command_t *pc,ide_handler_t *handler);
-void idetape_pc_intr (ide_drive_t *drive);
+#define IDETAPE_MIN(a,b) ((a)<(b) ? (a):(b))
+#define IDETAPE_MAX(a,b) ((a)>(b) ? (a):(b))
/*
- * DSC handling functions.
+ * Run time configurable parameters.
*/
-
-void idetape_postpone_request (ide_drive_t *drive);
-void idetape_poll_for_dsc (unsigned long data);
-void idetape_poll_for_dsc_direct (unsigned long data);
-void idetape_put_back_postponed_request (ide_drive_t *drive);
-void idetape_media_access_finished (ide_drive_t *drive);
+typedef struct {
+ int dsc_rw_frequency;
+ int dsc_media_access_frequency;
+ int nr_stages;
+} idetape_config_t;
/*
- * Some more packet command related functions.
+ * The variables below are used for the character device interface.
+ * Additional state variables are defined in our ide_drive_t structure.
*/
-
-void idetape_pc_callback (ide_drive_t *drive);
-void idetape_retry_pc (ide_drive_t *drive);
-void idetape_zero_packet_command (idetape_packet_command_t *pc);
-void idetape_queue_pc_head (ide_drive_t *drive,idetape_packet_command_t *pc,struct request *rq);
-void idetape_analyze_error (ide_drive_t *drive,idetape_request_sense_result_t *result);
-
-idetape_packet_command_t *idetape_next_pc_storage (ide_drive_t *drive);
-struct request *idetape_next_rq_storage (ide_drive_t *drive);
+static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES];
+static int idetape_chrdev_present = 0;
/*
- * Various packet commands
- */
-
-void idetape_create_inquiry_cmd (idetape_packet_command_t *pc);
-void idetape_inquiry_callback (ide_drive_t *drive);
-void idetape_create_locate_cmd (idetape_packet_command_t *pc,unsigned long block,byte partition);
-void idetape_create_rewind_cmd (idetape_packet_command_t *pc);
-void idetape_create_write_filemark_cmd (idetape_packet_command_t *pc,int write_filemark);
-void idetape_create_load_unload_cmd (idetape_packet_command_t *pc,int cmd);
-void idetape_create_space_cmd (idetape_packet_command_t *pc,long count,byte cmd);
-void idetape_create_erase_cmd (idetape_packet_command_t *pc);
-void idetape_create_test_unit_ready_cmd (idetape_packet_command_t *pc);
-void idetape_create_read_position_cmd (idetape_packet_command_t *pc);
-void idetape_read_position_callback (ide_drive_t *drive);
-void idetape_create_read_cmd (idetape_packet_command_t *pc,unsigned long length);
-void idetape_read_callback (ide_drive_t *drive);
-void idetape_create_write_cmd (idetape_packet_command_t *pc,unsigned long length);
-void idetape_write_callback (ide_drive_t *drive);
-void idetape_create_request_sense_cmd (idetape_packet_command_t *pc);
-void idetape_create_mode_sense_cmd (idetape_packet_command_t *pc,byte page_code);
-void idetape_request_sense_callback (ide_drive_t *drive);
-
-void idetape_display_inquiry_result (byte *buffer);
-
-/*
- * Character device callback functions.
- *
- * We currently support:
- *
- * OPEN, RELEASE, READ, WRITE and IOCTL.
- */
-
-int idetape_chrdev_read (struct inode *inode, struct file *file, char *buf, int count);
-int idetape_chrdev_write (struct inode *inode, struct file *file, const char *buf, int count);
-int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
-int idetape_chrdev_open (struct inode *inode, struct file *file);
-void idetape_chrdev_release (struct inode *inode,struct file *file);
-
-/*
- * idetape_mtioctop implements general magnetic tape io control
- * commands, as defined in include/linux/mtio.h. Those commands are
- * accessed through the character device interface, using the MTIOCTOP
- * ioctl.
+ * Too bad. The drive wants to send us data which we are not ready to accept.
+ * Just throw it away.
*/
-
-int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count);
+static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
+{
+ while (bcount--)
+ IN_BYTE (IDE_DATA_REG);
+}
-/*
- * idetape_space_over_filemarks handles the MTFSF, MTFSFM, ... mtio.h
- * commands.
- */
-
-int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count);
+static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
+{
+ struct buffer_head *bh = pc->bh;
+ int count;
+
+ while (bcount) {
+#if IDETAPE_DEBUG_BUGS
+ if (bh == NULL) {
+ printk (KERN_ERR "ide-tape: bh == NULL in idetape_input_buffers\n");
+ idetape_discard_data (drive, bcount);
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ count = IDETAPE_MIN (bh->b_size - bh->b_count, bcount);
+ atapi_input_bytes (drive, bh->b_data + bh->b_count, count);
+ bcount -= count; bh->b_count += count;
+ if (bh->b_count == bh->b_size) {
+ bh = bh->b_reqnext;
+ if (bh)
+ bh->b_count = 0;
+ }
+ }
+ pc->bh = bh;
+}
-/*
- * idetape_add_chrdev_read_request is called from idetape_chrdev_read
- * to service a character device read request and add read-ahead
- * requests to our pipeline.
- */
-
-int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks,char *buffer);
+static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
+{
+ struct buffer_head *bh = pc->bh;
+ int count;
+
+ while (bcount) {
+#if IDETAPE_DEBUG_BUGS
+ if (bh == NULL) {
+ printk (KERN_ERR "ide-tape: bh == NULL in idetape_output_buffers\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ count = IDETAPE_MIN (pc->b_count, bcount);
+ atapi_output_bytes (drive, pc->b_data, count);
+ bcount -= count; pc->b_data += count; pc->b_count -= count;
+ if (!pc->b_count) {
+ pc->bh = bh = bh->b_reqnext;
+ if (bh) {
+ pc->b_data = bh->b_data;
+ pc->b_count = bh->b_count;
+ }
+ }
+ }
+}
-/*
- * idetape_add_chrdev_write_request adds a character device write
- * request to the pipeline.
- */
-
-int idetape_add_chrdev_write_request (ide_drive_t *drive,int blocks,char *buffer);
+#ifdef CONFIG_BLK_DEV_TRITON
+static void idetape_update_buffers (idetape_pc_t *pc)
+{
+ struct buffer_head *bh = pc->bh;
+ int count, bcount = pc->actually_transferred;
-/*
- * idetape_queue_rw_tail will add a command to the tail of the device
- * request queue and wait for it to finish. This is used when we
- * can not allocate pipeline stages (or in non-pipelined mode).
- */
-
-int idetape_queue_rw_tail (ide_drive_t *drive,int cmd,int blocks,char *buffer);
+ if (test_bit (PC_WRITING, &pc->flags))
+ return;
+ while (bcount) {
+#if IDETAPE_DEBUG_BUGS
+ if (bh == NULL) {
+ printk (KERN_ERR "ide-tape: bh == NULL in idetape_update_buffers\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ count = IDETAPE_MIN (bh->b_size, bcount);
+ bh->b_count = count;
+ if (bh->b_count == bh->b_size)
+ bh = bh->b_reqnext;
+ bcount -= count;
+ }
+ pc->bh = bh;
+}
+#endif /* CONFIG_BLK_DEV_TRITON */
/*
- * Adds a packet command request to the tail of the device request
- * queue and waits for it to be serviced.
+ * idetape_poll_for_dsc gets invoked by a timer (which was set
+ * by idetape_postpone_request) to reinsert our postponed request
+ * into the request queue.
+ *
+ * Note that the procedure done here is different than the method
+ * we are using in idetape_queue_pc_head - There we are putting
+ * request(s) before our currently called request.
+ *
+ * Here, on the other hand, HWGROUP(drive)->rq is not our request
+ * but rather a request to another device. Therefore, we will let
+ * it finish and only then service our postponed request --> We don't
+ * touch HWGROUP(drive)->rq.
*/
-
-int idetape_queue_pc_tail (ide_drive_t *drive,idetape_packet_command_t *pc);
+static void idetape_poll_for_dsc (unsigned long data)
+{
+ ide_drive_t *drive=(ide_drive_t *) data;
+ idetape_tape_t *tape = drive->driver_data;
-int idetape_position_tape (ide_drive_t *drive,unsigned long block);
-int idetape_rewind_tape (ide_drive_t *drive);
-int idetape_flush_tape_buffers (ide_drive_t *drive);
+ del_timer (&tape->dsc_timer);
-/*
- * Used to get device information
- */
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "ide-tape: Putting back postponed request\n");
+#endif /* IDETAPE_DEBUG_LOG */
+#if IDETAPE_DEBUG_BUGS
+ if (tape->postponed_rq == NULL) {
+ printk (KERN_ERR "tape->postponed_rq is NULL in idetape_poll_for_dsc\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
-void idetape_get_mode_sense_results (ide_drive_t *drive);
+ (void) ide_do_drive_cmd (drive, tape->postponed_rq, ide_next);
+}
/*
- * General utility functions
+ * idetape_postpone_request postpones the current request so that
+ * ide.c will be able to service requests from another device on
+ * the same hwgroup while we are polling for DSC.
*/
-
-unsigned long idetape_swap_long (unsigned long temp);
-unsigned short idetape_swap_short (unsigned short temp);
+static void idetape_postpone_request (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct request *rq;
+
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_postpone_request\n");
+#endif /* IDETAPE_DEBUG_LOG */
+#if IDETAPE_DEBUG_BUGS
+ if (tape->postponed_rq != NULL)
+ printk (KERN_ERR "ide-tape.c bug - postponed_rq not NULL in idetape_postpone_request\n");
+#endif /* IDETAPE_DEBUG_BUGS */
-#define IDETAPE_MIN(a,b) ((a)<(b) ? (a):(b))
+ /*
+ * Set the timer parameters.
+ */
+ tape->dsc_timer.expires=jiffies + tape->dsc_polling_frequency;
+ tape->dsc_timer.data=(unsigned long) drive;
+ tape->dsc_timer.function = &idetape_poll_for_dsc;
+ init_timer (&tape->dsc_timer);
-/*
- * Pipeline related functions
- */
+ /*
+ * Remove current request from the request queue:
+ */
+ tape->postponed_rq = rq = HWGROUP(drive)->rq;
+ rq->rq_status = IDETAPE_RQ_POSTPONED;
+ blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
+ HWGROUP(drive)->rq = NULL;
-idetape_pipeline_stage_t *idetape_kmalloc_stage (ide_drive_t *drive);
-void idetape_kfree_stage (idetape_pipeline_stage_t *stage);
-void idetape_copy_buffer_from_stage (idetape_pipeline_stage_t *stage,char *buffer);
-void idetape_copy_buffer_to_stage (idetape_pipeline_stage_t *stage,char *buffer);
-void idetape_increase_max_pipeline_stages (ide_drive_t *drive);
-void idetape_add_stage_tail (ide_drive_t *drive,idetape_pipeline_stage_t *stage);
-void idetape_remove_stage_head (ide_drive_t *drive);
-void idetape_active_next_stage (ide_drive_t *drive);
-void idetape_wait_for_pipeline (ide_drive_t *drive);
-void idetape_discard_read_pipeline (ide_drive_t *drive);
-void idetape_empty_write_pipeline (ide_drive_t *drive);
-void idetape_insert_pipeline_into_queue (ide_drive_t *drive);
+ add_timer(&tape->dsc_timer); /* Activate the polling timer */
+}
/*
- * For general magnetic tape device compatibility.
- */
-
-#include <linux/mtio.h>
-
-/*
- * Global variables
- *
- * The variables below are used for the character device interface.
- *
- * Additional state variables are defined in our ide_drive_t structure.
- */
-
-idetape_chrdev_t idetape_chrdev; /* Character device interface information */
-byte idetape_drive_already_found=0; /* 1 when the above data structure is initialized */
-
-/*
- * Our character device supporting functions, passed to register_chrdev.
- */
-
-static struct file_operations idetape_fops = {
- NULL, /* lseek - default */
- idetape_chrdev_read, /* read */
- idetape_chrdev_write, /* write */
- NULL, /* readdir - bad */
- NULL, /* select */
- idetape_chrdev_ioctl, /* ioctl */
- NULL, /* mmap */
- idetape_chrdev_open, /* open */
- idetape_chrdev_release, /* release */
- NULL, /* fsync */
- NULL, /* fasync */
- NULL, /* check_media_change */
- NULL /* revalidate */
-};
-
-
-/*
- * idetape_identify_device is called by do_identify in ide.c during
- * the device probing stage to check the contents of the ATAPI IDENTIFY
- * command results, in case the device type is tape. We return:
- *
- * 1 If the tape can be supported by us, based on the information
- * we have so far.
- *
- * 0 If this tape driver is not currently supported by us.
- *
- * In case we decide to support the tape, we store the current drive
- * pointer in our character device global variables, so that we can
- * pass between both interfaces.
- */
-
-int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id)
-
-{
- struct idetape_id_gcw gcw;
- unsigned short *ptr;
- int support=1;
-#if IDETAPE_DEBUG_LOG
- unsigned short mask,i;
-#endif /* IDETAPE_DEBUG_LOG */
-
- ptr=(unsigned short *) &gcw;
- *ptr=id->config;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Dumping ATAPI Identify Device tape parameters\n");
-
- printk ("Protocol Type: ");
- switch (gcw.protocol) {
- case 0: case 1: printk ("ATA\n");break;
- case 2: printk ("ATAPI\n");break;
- case 3: printk ("Reserved (Unknown to ide-tape)\n");break;
- }
-
- printk ("Device Type: %x - ",gcw.device_type);
- switch (gcw.device_type) {
- case 0: printk ("Direct-access Device\n");break;
- case 1: printk ("Streaming Tape Device\n");break;
- case 2: case 3: case 4: printk ("Reserved\n");break;
- case 5: printk ("CD-ROM Device\n");break;
- case 6: printk ("Reserved\n");
- case 7: printk ("Optical memory Device\n");break;
- case 0x1f: printk ("Unknown or no Device type\n");break;
- default: printk ("Reserved\n");
- }
- printk ("Removable: %s",gcw.removable ? "Yes\n":"No\n");
-
- printk ("Command Packet DRQ Type: ");
- switch (gcw.drq_type) {
- case 0: printk ("Microprocessor DRQ\n");break;
- case 1: printk ("Interrupt DRQ\n");break;
- case 2: printk ("Accelerated DRQ\n");break;
- case 3: printk ("Reserved\n");break;
- }
-
- printk ("Command Packet Size: ");
- switch (gcw.packet_size) {
- case 0: printk ("12 bytes\n");break;
- case 1: printk ("16 bytes\n");break;
- default: printk ("Reserved\n");break;
- }
- printk ("Model: %s\n",id->model);
- printk ("Firmware Revision: %s\n",id->fw_rev);
- printk ("Serial Number: %s\n",id->serial_no);
- printk ("Write buffer size: %d bytes\n",id->buf_size*512);
- printk ("DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
- printk ("LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
- printk ("IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
- printk ("IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
- printk ("ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
- printk ("PIO Cycle Timing Category: %d\n",id->tPIO);
- printk ("DMA Cycle Timing Category: %d\n",id->tDMA);
- printk ("Single Word DMA supported modes: ");
- for (i=0,mask=1;i<8;i++,mask=mask << 1) {
- if (id->dma_1word & mask)
- printk ("%d ",i);
- if (id->dma_1word & (mask << 8))
- printk ("(active) ");
- }
- printk ("\n");
-
- printk ("Multi Word DMA supported modes: ");
- for (i=0,mask=1;i<8;i++,mask=mask << 1) {
- if (id->dma_mword & mask)
- printk ("%d ",i);
- if (id->dma_mword & (mask << 8))
- printk ("(active) ");
- }
- printk ("\n");
-
- if (id->field_valid & 0x0002) {
- printk ("Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None");
- printk ("Minimum Multi-word DMA cycle per word: ");
- if (id->eide_dma_min == 0)
- printk ("Not supported\n");
- else
- printk ("%d ns\n",id->eide_dma_min);
-
- printk ("Manufacturer\'s Recommended Multi-word cycle: ");
- if (id->eide_dma_time == 0)
- printk ("Not supported\n");
- else
- printk ("%d ns\n",id->eide_dma_time);
-
- printk ("Minimum PIO cycle without IORDY: ");
- if (id->eide_pio == 0)
- printk ("Not supported\n");
- else
- printk ("%d ns\n",id->eide_pio);
-
- printk ("Minimum PIO cycle with IORDY: ");
- if (id->eide_pio_iordy == 0)
- printk ("Not supported\n");
- else
- printk ("%d ns\n",id->eide_pio_iordy);
-
- }
-
- else {
- printk ("According to the device, fields 64-70 are not valid.\n");
- }
-#endif /* IDETAPE_DEBUG_LOG */
-
- /* Check that we can support this device */
-
- if (gcw.protocol !=2 ) {
- printk ("ide-tape: Protocol is not ATAPI\n");support=0;
- }
-
- if (gcw.device_type != 1) {
- printk ("ide-tape: Device type is not set to tape\n");support=0;
- }
-
- if (!gcw.removable) {
- printk ("ide-tape: The removable flag is not set\n");support=0;
- }
-
- if (gcw.drq_type != 2) {
- printk ("ide-tape: Sorry, DRQ types other than Accelerated DRQ\n");
- printk ("ide-tape: are still not supported by the driver\n");support=0;
- }
-
- if (gcw.packet_size != 0) {
- printk ("ide-tape: Packet size is not 12 bytes long\n");
- if (gcw.packet_size == 1)
- printk ("ide-tape: Sorry, padding to 16 bytes is still not supported\n");
- support=0;
- }
-
- if (idetape_drive_already_found) {
- printk ("ide-tape: Sorry, only one ide tape drive is supported by the driver\n");
- support=0;
- }
- else {
- idetape_drive_already_found=1;
- idetape_chrdev.drive=drive;
- idetape_chrdev.major=IDETAPE_MAJOR;
- idetape_chrdev.minor=0;
- idetape_chrdev.name[0]='h';
- idetape_chrdev.name[1]='t';
- idetape_chrdev.name[2]='0';
- idetape_chrdev.name[3]=0;
- }
-
- return (support); /* In case support=0, we will not install the driver */
-}
-
-/*
- * idetape_register_chrdev calls register_chrdev to register our character
- * device interface. The connection to the ide_drive_t structure, which
- * is used by the entire ide driver is provided by our global variable
- * idetape_chrdev.drive, which was initialized earlier, during the device
- * probing stage.
- */
-
-void idetape_register_chrdev (void)
-
-{
- int major,minor;
- ide_drive_t *drive;
-
- if (!idetape_drive_already_found)
- return;
-
- drive=idetape_chrdev.drive;
- major=idetape_chrdev.major;
- minor=idetape_chrdev.minor;
-
- if (register_chrdev (major,idetape_chrdev.name,&idetape_fops)) {
- printk ("Unable to register character device interface !\n");
- /* ??? */
- }
- else {
- printk ("ide-tape: %s <-> %s : Character device interface on major = %d\n",
- drive->name,idetape_chrdev.name,major);
- }
-}
-
-/*
- * idetape_setup is called from the ide driver in the partition table
- * identification stage, to:
- *
- * 1. Initialize our various state variables.
- * 2. Ask the tape for its capabilities.
- * 3. Allocate a buffer which will be used for data
- * transfer. The buffer size is chosen based on
- * the recommendation which we received in step (2).
- *
- * Note that at this point ide.c already assigned us an irq, so that
- * we can queue requests here and wait for their completion.
- */
-
-void idetape_setup (ide_drive_t *drive)
-
-{
- idetape_tape_t *tape=&(drive->tape);
- unsigned int allocation_length;
-#if IDETAPE_ANTICIPATE_READ_WRITE_DSC
- ide_hwif_t *hwif = HWIF(drive);
- unsigned long t1, tmid, tn;
-#endif /* IDETAPE_ANTICIPATE_READ_WRITE_DSC */
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_setup\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- drive->ready_stat = 0; /* With an ATAPI device, we can issue packet commands */
- /* regardless of the state of DRDY */
- HWIF(drive)->tape_drive=drive;
-
- tape->block_address=0;
- tape->block_address_valid=0;
- tape->pc_stack_index=0;
- tape->failed_pc=NULL;
- tape->postponed_rq=NULL;
- tape->busy=0;
- tape->active_data_request=NULL;
- tape->current_number_of_stages=0;
- tape->first_stage=tape->next_stage=tape->last_stage=NULL;
- tape->error_in_pipeline_stage=0;
- tape->request_status=0;
- tape->chrdev_direction=idetape_direction_none;
- tape->reset_issued=0;
- tape->pc=&(tape->pc_stack [0]);
-
-#if IDETAPE_PIPELINE
- tape->max_number_of_stages=IDETAPE_MIN_PIPELINE_STAGES;
- printk ("ide-tape: Operating in pipelined (fast and tricky) operation mode.\n");
-#else
- tape->max_number_of_stages=0;
- printk ("ide-tape: Operating in non-pipelined (slow and safe) operation mode.\n");
-#endif /* IDETAPE_PIPELINE */
-
- idetape_get_mode_sense_results (drive);
-
- tape->data_buffer_size = tape->capabilities.ctl * tape->tape_block_size;
- while (tape->data_buffer_size > 0xffff) {
- tape->capabilities.ctl /= 2;
- tape->data_buffer_size = tape->capabilities.ctl * tape->tape_block_size;
- }
- allocation_length=tape->data_buffer_size;
- if (tape->data_buffer_size % IDETAPE_ALLOCATION_BLOCK)
- allocation_length+=IDETAPE_ALLOCATION_BLOCK;
-
-#if IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE
- tape->data_buffer=tape->merge_buffer=NULL;
-#else
- tape->data_buffer=kmalloc (allocation_length,GFP_KERNEL);
- tape->merge_buffer=kmalloc (allocation_length,GFP_KERNEL);
- if (tape->data_buffer == NULL || tape->merge_buffer == NULL) {
- printk ("ide-tape: FATAL - Can not allocate 2 buffers of %d bytes each\n",allocation_length);
- printk ("ide-tape: Aborting character device installation\n");
- idetape_drive_already_found=0;
- unregister_chrdev (idetape_chrdev.major,idetape_chrdev.name);
- return;
- }
-#endif /* IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE */
-
- tape->merge_buffer_size=tape->merge_buffer_offset=0;
-
-#if IDETAPE_ANTICIPATE_READ_WRITE_DSC
-
- /*
- * Cleverly select the DSC read/write polling frequency, based
- * on the tape's speed, its recommended transfer unit, its
- * internal buffer size and our operation mode.
- *
- * In the pipelined operation mode we aim for "catching" the
- * tape when its internal buffer is about 50% full. This will
- * dramatically reduce our polling frequency and will also
- * leave enough time for the ongoing request of the other device
- * to complete before the buffer is completely empty. We will
- * then completely refill the buffer with requests from our
- * internal pipeline.
- *
- * When operating in the non-pipelined operation mode, we
- * can't allow ourself this luxury. Instead, we will try to take
- * full advantage of the internal tape buffer by waiting only
- * for one request to complete. This will increase our load
- * on linux but will usually still fail to keep the tape
- * constantly streaming.
- */
-
- /*
- * We will ignore the above algorithm for now, as it can have
- * a bad effect on interactive response under some conditions.
- * The following attempts to find a balance between good latency
- * and good system throughput. It will be nice to have all this
- * configurable in run time at some point.
- */
- t1 = (tape->data_buffer_size * HZ) / (tape->capabilities.speed * 1000);
- tmid = (tape->capabilities.buffer_size * 32 * HZ) / (tape->capabilities.speed * 125);
- tn = (IDETAPE_FIFO_THRESHOLD * tape->data_buffer_size * HZ) / (tape->capabilities.speed * 1000);
-
- if (tape->max_number_of_stages) {
- if (drive->using_dma)
- tape->best_dsc_rw_frequency = tmid;
- else {
- if (hwif->drives[drive->select.b.unit ^ 1].present || hwif->next != hwif)
- tape->best_dsc_rw_frequency = IDETAPE_MIN ((tn + tmid) / 2, tmid);
- else
- tape->best_dsc_rw_frequency = IDETAPE_MIN (tn, tmid);
- }
- } else
- tape->best_dsc_rw_frequency = t1;
-
- /*
- * Ensure that the number we got makes sense.
- */
-
- if (tape->best_dsc_rw_frequency > IDETAPE_DSC_READ_WRITE_LOWEST_FREQUENCY) {
- printk ("ide-tape: Although the recommended polling period is %lu jiffies, \n",tape->best_dsc_rw_frequency);
- printk ("ide-tape: we will use %u jiffies\n",IDETAPE_DSC_READ_WRITE_LOWEST_FREQUENCY);
- printk ("ide-tape: (It may well be that we are wrong here)\n");
- tape->best_dsc_rw_frequency = IDETAPE_DSC_READ_WRITE_LOWEST_FREQUENCY;
- }
-
- if (tape->best_dsc_rw_frequency < IDETAPE_DSC_READ_WRITE_FALLBACK_FREQUENCY) {
- printk ("ide-tape: Although the recommended polling period is %lu jiffies, \n",tape->best_dsc_rw_frequency);
- printk ("ide-tape: we will use %u jiffies\n",IDETAPE_DSC_READ_WRITE_FALLBACK_FREQUENCY);
- tape->best_dsc_rw_frequency = IDETAPE_DSC_READ_WRITE_FALLBACK_FREQUENCY;
- }
-
-#else
- tape->best_dsc_rw_frequency=IDETAPE_DSC_READ_WRITE_FALLBACK_FREQUENCY;
-#endif /* IDETAPE_ANTICIPATE_READ_WRITE_DSC */
-
- printk (KERN_INFO "ide-tape: %s <-> %s, %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n",
- drive->name, "ht0", tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->data_buffer_size,
- tape->data_buffer_size / 1024, tape->max_number_of_stages * tape->data_buffer_size / 1024,
- tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":"");
- return;
-}
-
-/*
- * idetape_get_mode_sense_results asks the tape about its various
- * parameters. In particular, we will adjust our data transfer buffer
- * size to the recommended value as returned by the tape.
- */
-
-void idetape_get_mode_sense_results (ide_drive_t *drive)
-
-{
- int retval;
- idetape_tape_t *tape=&(drive->tape);
- idetape_mode_parameter_header_t *header;
- idetape_capabilities_page_t *capabilities;
- idetape_packet_command_t pc;
-
- idetape_create_mode_sense_cmd (&pc,IDETAPE_CAPABILITIES_PAGE);
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
- retval=idetape_queue_pc_tail (drive,&pc);
-
- header=(idetape_mode_parameter_header_t *) pc.buffer;
- capabilities=(idetape_capabilities_page_t *) (pc.buffer+sizeof (idetape_mode_parameter_header_t));
-
- capabilities->max_speed=idetape_swap_short (capabilities->max_speed);
- capabilities->ctl=idetape_swap_short (capabilities->ctl);
- capabilities->speed=idetape_swap_short (capabilities->speed);
- capabilities->buffer_size=idetape_swap_short (capabilities->buffer_size);
-
- tape->capabilities=*capabilities; /* Save us a copy */
- tape->tape_block_size=capabilities->blk512 ? 512:1024;
-
- if (retval) {
- printk ("ide-tape: Can't get tape parameters\n");
- printk ("ide-tape: Assuming some default parameters\n");
- tape->tape_block_size=512;
- tape->capabilities.ctl=52;
- tape->capabilities.speed=450;
- tape->capabilities.buffer_size=6*52;
- return;
- }
-
-#if IDETAPE_DEBUG_LOG
- printk ("Dumping the results of the MODE SENSE packet command\n");
- printk ("Mode Parameter Header:\n");
- printk ("Mode Data Length - %d\n",header->mode_data_length);
- printk ("Medium Type - %d\n",header->medium_type);
- printk ("Device Specific Parameter - %d\n",header->dsp);
- printk ("Block Descriptor Length - %d\n",header->bdl);
-
- printk ("Capabilities and Mechanical Status Page:\n");
- printk ("Page code - %d\n",capabilities->page_code);
- printk ("Page length - %d\n",capabilities->page_length);
- printk ("Read only - %s\n",capabilities->ro ? "Yes":"No");
- printk ("Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
- printk ("Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
- printk ("Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
- printk ("Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
- printk ("The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
- printk ("The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
- printk ("Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
- printk ("Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
- printk ("Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
- printk ("Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
- printk ("Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
- printk ("Restricted byte count for PIO transfers - %s\n",capabilities->slowb ? "Yes":"No");
- printk ("Maximum supported speed in KBps - %d\n",capabilities->max_speed);
- printk ("Continuous transfer limits in blocks - %d\n",capabilities->ctl);
- printk ("Current speed in KBps - %d\n",capabilities->speed);
- printk ("Buffer size - %d\n",capabilities->buffer_size*512);
-#endif /* IDETAPE_DEBUG_LOG */
-}
-
-/*
- * Packet Command Interface
- *
- * The current Packet Command is available in tape->pc, and will not
- * change until we finish handling it. Each packet command is associated
- * with a callback function that will be called when the command is
- * finished.
- *
- * The handling will be done in three stages:
- *
- * 1. idetape_issue_packet_command will send the packet command to the
- * drive, and will set the interrupt handler to idetape_pc_intr.
- *
- * 2. On each interrupt, idetape_pc_intr will be called. This step
- * will be repeated until the device signals us that no more
- * interrupts will be issued.
- *
- * 3. ATAPI Tape media access commands have immediate status with a
- * delayed process. In case of a successful initiation of a
- * media access packet command, the DSC bit will be set when the
- * actual execution of the command is finished.
- * Since the tape drive will not issue an interrupt, we have to
- * poll for this event. In this case, we define the request as
- * "low priority request" by setting rq_status to
- * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
- * the driver.
- *
- * ide.c will then give higher priority to requests which
- * originate from the other device, until will change rq_status
- * to RQ_ACTIVE.
- *
- * 4. When the packet command is finished, it will be checked for errors.
- *
- * 5. In case an error was found, we queue a request sense packet command
- * in front of the request queue and retry the operation up to
- * IDETAPE_MAX_PC_RETRIES times.
- *
- * 6. In case no error was found, or we decided to give up and not
- * to retry again, the callback function will be called and then
- * we will handle the next request.
- *
- */
-
-void idetape_issue_packet_command (ide_drive_t *drive,idetape_packet_command_t *pc,ide_handler_t *handler)
-
-{
- idetape_tape_t *tape;
- idetape_bcount_reg_t bcount;
- idetape_ireason_reg_t ireason;
- int dma_ok=0;
-
- tape=&(drive->tape);
-
-#if IDETAPE_DEBUG_BUGS
- if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- printk ("ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n");
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
- tape->failed_pc=pc;
- tape->pc=pc; /* Set the current packet command */
-
- if (pc->retries > IDETAPE_MAX_PC_RETRIES || pc->abort) {
-
- /*
- * We will "abort" retrying a packet command in case
- * a legitimate error code was received (crossing a
- * filemark, or DMA error in the end of media, for
- * example).
- */
-
- if (!pc->abort) {
- printk ("ide-tape: %s: I/O error, ",drive->name);
- printk ("pc = %x, key = %x, asc = %x, ascq = %x\n",pc->c[0],tape->sense_key,tape->asc,tape->ascq);
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Maximum retries reached - Giving up\n");
-#endif /* IDETAPE_DEBUG_LOG */
- pc->error=1; /* Giving up */
- }
- tape->failed_pc=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (pc->callback==NULL)
- printk ("ide-tape: ide-tape bug - Callback function not set !\n");
- else
-#endif /* IDETAPE_DEBUG_BUGS */
- (*pc->callback)(drive);
- return;
- }
-
-#if IDETAPE_DEBUG_LOG
- printk ("Retry number - %d\n",pc->retries);
-#endif /* IDETAPE_DEBUG_LOG */
-
- pc->retries++;
-
-/*
- * We no longer call ide_wait_stat to wait for the drive to be ready,
- * as ide.c already does this for us in do_request.
- */
-
- pc->actually_transferred=0; /* We haven't transferred any data yet */
- pc->current_position=pc->buffer;
- bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */
-
-#ifdef CONFIG_BLK_DEV_TRITON
- if (pc->dma_error) {
- printk ("ide-tape: DMA disabled, reverting to PIO\n");
- drive->using_dma=0;
- pc->dma_error=0;
- }
- if (pc->request_transfer && pc->dma_recommended && drive->using_dma) {
- dma_ok=!(HWIF(drive)->dmaproc(pc->writing ? ide_dma_write : ide_dma_read, drive));
- }
-#endif /* CONFIG_BLK_DEV_TRITON */
-
- OUT_BYTE (drive->ctl,IDETAPE_CONTROL_REG);
- OUT_BYTE (dma_ok ? 1:0,IDETAPE_FEATURES_REG); /* Use PIO/DMA */
- OUT_BYTE (bcount.b.high,IDETAPE_BCOUNTH_REG);
- OUT_BYTE (bcount.b.low,IDETAPE_BCOUNTL_REG);
- OUT_BYTE (drive->select.all,IDETAPE_DRIVESEL_REG);
-
- ide_set_handler (drive,handler,WAIT_CMD); /* Set the interrupt routine */
- OUT_BYTE (WIN_PACKETCMD,IDETAPE_ATACOMMAND_REG); /* Issue the packet command */
- if (ide_wait_stat (drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { /* Wait for DRQ to be ready - Assuming Accelerated DRQ */
- /*
- * We currently only support tape drives which report
- * accelerated DRQ assertion. For this case, specs
- * allow up to 50us. We really shouldn't get here.
- *
- * ??? Still needs to think what to do if we reach
- * here anyway.
- */
-
- printk ("ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
- return;
- }
-
- ireason.all=IN_BYTE (IDETAPE_IREASON_REG);
- if (!ireason.b.cod || ireason.b.io) {
- printk ("ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n");
- ide_do_reset (drive);
- return;
- }
-
- ide_output_data (drive,pc->c,12/4); /* Send the actual packet */
-#ifdef CONFIG_BLK_DEV_TRITON
- if ((pc->dma_in_progress=dma_ok)) { /* Begin DMA, if necessary */
- pc->dma_error=0;
- (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
- }
-#endif /* CONFIG_BLK_DEV_TRITON */
-}
-
-/*
- * idetape_pc_intr is the usual interrupt handler which will be called
- * during a packet command. We will transfer some of the data (as
- * requested by the drive) and will re-point interrupt handler to us.
- * When data transfer is finished, we will act according to the
- * algorithm described before idetape_issue_packet_command.
+ * idetape_queue_pc_head generates a new packet command request in front
+ * of the request queue, before the current request, so that it will be
+ * processed immediately, on the next pass through the driver.
*
- */
-
-
-void idetape_pc_intr (ide_drive_t *drive)
-
-{
- idetape_tape_t *tape=&(drive->tape);
- idetape_status_reg_t status;
- idetape_bcount_reg_t bcount;
- idetape_ireason_reg_t ireason;
- idetape_packet_command_t *pc=tape->pc;
- unsigned long temp;
-
-#ifdef CONFIG_BLK_DEV_TRITON
- if (pc->dma_in_progress) {
- if ((pc->dma_error=HWIF(drive)->dmaproc(ide_dma_status_bad, drive)))
- /*
- * We will currently correct the following in
- * idetape_analyze_error.
- */
- pc->actually_transferred=HWIF(drive)->dmaproc(ide_dma_transferred, drive);
- else
- pc->actually_transferred=pc->request_transfer;
- (void) (HWIF(drive)->dmaproc(ide_dma_abort, drive)); /* End DMA */
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: DMA finished\n");
-#endif /* IDETAPE_DEBUG_LOG */
- }
-#endif /* CONFIG_BLK_DEV_TRITON */
-
- status.all=IN_BYTE (IDETAPE_STATUS_REG); /* Clear the interrupt */
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_pc_intr interrupt handler\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (!status.b.drq) { /* No more interrupts */
-#if IDETAPE_DEBUG_LOG
- printk ("Packet command completed\n");
- printk ("Total bytes transferred: %lu\n",pc->actually_transferred);
-#endif /* IDETAPE_DEBUG_LOG */
- pc->dma_in_progress=0;
-
- sti ();
-
- if (status.b.check || pc->dma_error) { /* Error detected */
-#if IDETAPE_DEBUG_LOG
- /*
- * Without debugging, we only log an error if we decided to
- * give up retrying.
- */
- printk ("ide-tape: %s: I/O error, ",drive->name);
-#endif /* IDETAPE_DEBUG_LOG */
- if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- printk ("ide-tape: I/O error in request sense command\n");
- ide_do_reset (drive);
- return;
- }
-
- idetape_retry_pc (drive); /* Retry operation */
- return;
- }
- pc->error=0;
- if (pc->wait_for_dsc && !status.b.dsc) { /* Media access command */
- tape->dsc_polling_frequency=IDETAPE_DSC_FAST_MEDIA_ACCESS_FREQUENCY;
- idetape_postpone_request (drive); /* Allow ide.c to handle other requests */
- return;
- }
- if (tape->failed_pc == pc)
- tape->failed_pc=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (pc->callback==NULL)
- printk ("ide-tape: ide-tape bug - Callback function not set !\n");
- else
-#endif /* IDETAPE_DEBUG_BUGS */
- (*pc->callback)(drive); /* Command finished - Call the callback function */
- return;
- }
-#ifdef CONFIG_BLK_DEV_TRITON
- if (pc->dma_in_progress) {
- pc->dma_in_progress=0;
- printk ("ide-tape: The tape wants to issue more interrupts in DMA mode\n");
- printk ("ide-tape: DMA disabled, reverting to PIO\n");
- drive->using_dma=0;
- ide_do_reset (drive);
- return;
- }
-#endif /* CONFIG_BLK_DEV_TRITON */
- bcount.b.high=IN_BYTE (IDETAPE_BCOUNTH_REG); /* Get the number of bytes to transfer */
- bcount.b.low=IN_BYTE (IDETAPE_BCOUNTL_REG); /* on this interrupt */
- ireason.all=IN_BYTE (IDETAPE_IREASON_REG); /* Read the interrupt reason register */
-
- if (ireason.b.cod) {
- printk ("ide-tape: CoD != 0 in idetape_pc_intr\n");
- ide_do_reset (drive);
- return;
- }
- if (ireason.b.io != !(pc->writing)) { /* Hopefully, we will never get here */
- printk ("ide-tape: We wanted to %s, ",pc->writing ? "Write":"Read");
- printk ("but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write");
- ide_do_reset (drive);
- return;
- }
-
- if (!pc->writing) { /* Reading - Check that we have enough space */
- temp=(unsigned long) pc->actually_transferred + bcount.all;
- if ( temp > pc->request_transfer) {
- if (temp > pc->buffer_size) {
- printk ("ide-tape: The tape wants to send us more data than requested - discarding data\n");
- idetape_discard_data (drive,bcount.all);
- ide_set_handler (drive,&idetape_pc_intr,WAIT_CMD);
- return;
- }
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: The tape wants to send us more data than requested - allowing transfer\n");
-#endif /* IDETAPE_DEBUG_LOG */
- }
- }
-#if IDETAPE_DEBUG_BUGS
- if (bcount.all && !pc->buffer) {
- printk ("ide-tape: ide-tape.c bug - Buffer not set in idetape_pc_intr. Discarding data.\n");
-
- if (!pc->writing) {
- printk ("ide-tape: Discarding data\n");
- idetape_discard_data (drive,bcount.all);
- ide_set_handler (drive,&idetape_pc_intr,WAIT_CMD);
- return;
- }
- else { /* ??? */
- }
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- if (pc->writing)
- idetape_output_data (drive,pc->current_position,bcount.all); /* Write the current buffer */
- else
- idetape_input_data (drive,pc->current_position,bcount.all); /* Read the current buffer */
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: %s %d bytes\n",pc->writing ? "Wrote":"Received",bcount.all);
-#endif /* IDETAPE_DEBUG_LOG */
- pc->actually_transferred+=bcount.all; /* Update the current position */
- pc->current_position+=bcount.all;
-
- ide_set_handler (drive,&idetape_pc_intr,WAIT_CMD); /* And set the interrupt handler again */
-}
-
-/*
- * idetape_postpone_request postpones the current request so that
- * ide.c will be able to service requests from another device on
- * the same hwgroup while we are polling for DSC.
- */
-
-void idetape_postpone_request (ide_drive_t *drive)
-
-{
- idetape_tape_t *tape=&(drive->tape);
- struct request *rq;
- idetape_status_reg_t status;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_postpone_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (tape->postponed_rq != NULL)
- printk ("ide-tape.c bug - postponed_rq not NULL in idetape_postpone_request\n");
-#endif /* IDETAPE_DEBUG_BUGS */
-
- tape->dsc_timer.expires=jiffies + tape->dsc_polling_frequency; /* Set timer to poll for */
- tape->dsc_timeout=jiffies+IDETAPE_DSC_TIMEOUT; /* actual completion */
- tape->dsc_timer.data=(unsigned long) drive;
- tape->dsc_timer.function=&idetape_poll_for_dsc;
- init_timer (&(tape->dsc_timer));
-
- /*
- * Remove current request from the request queue:
- */
-
- tape->postponed_rq = rq = HWGROUP(drive)->rq;
- rq->rq_status = IDETAPE_RQ_POSTPONED;
- blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
- HWGROUP(drive)->rq = NULL;
-
- /*
- * Check the status again - Maybe we can save one polling period.
- */
-
- status.all=IN_BYTE (IDETAPE_STATUS_REG);
- tape->last_status=status.all;
- tape->request_status=1;
-
- tape->dsc_polling_start=jiffies;
- add_timer(&(tape->dsc_timer)); /* Activate the polling timer */
-}
-
-/*
- * idetape_poll_for_dsc_direct is called from idetape_poll_for_dsc
- * to handle the case in which we can safely communicate with the tape
- * (since no other request for this hwgroup is active).
- */
-
-void idetape_poll_for_dsc_direct (unsigned long data)
-
-{
- ide_drive_t *drive=(ide_drive_t *) data;
- idetape_tape_t *tape=&(drive->tape);
- idetape_status_reg_t status;
-
-#if IDETAPE_DEBUG_LOG
- printk ("%s: idetape_poll_for_dsc_direct called\n",drive->name);
-#endif /* IDETAPE_DEBUG_LOG */
-
- OUT_BYTE(drive->select.all,IDE_SELECT_REG);
- status.all=IN_BYTE (IDETAPE_STATUS_REG);
-
- if (status.b.dsc) { /* DSC received */
- tape->dsc_received=1;
- del_timer (&(tape->dsc_timer)); /* Stop polling and put back the postponed */
- idetape_put_back_postponed_request (drive); /* request in the request queue */
- return;
- }
-
- if (jiffies > tape->dsc_timeout) { /* Timeout */
- tape->dsc_received=0;
- del_timer (&(tape->dsc_timer));
- /* ??? */
- idetape_put_back_postponed_request (drive);
- return;
- }
-
- /* Poll again */
-
- if (jiffies - tape->dsc_polling_start > IDETAPE_FAST_SLOW_THRESHOLD)
- tape->dsc_timer.expires = jiffies + IDETAPE_DSC_SLOW_MEDIA_ACCESS_FREQUENCY;
- else
- tape->dsc_timer.expires = jiffies + tape->dsc_polling_frequency;
- add_timer(&(tape->dsc_timer));
- return;
-}
-
-/*
- * idetape_poll_for_dsc gets invoked by a timer (which was set
- * by idetape_postpone_request) to poll for the DSC bit
- * in the status register.
+ * idetape_queue_pc_head is called from the request handling part of
+ * the driver (the "bottom" part). Safe storage for the request should
+ * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
+ * before calling idetape_queue_pc_head.
*
- * We take care not to perform any tape access if the driver is
- * accessing the other device. We will instead ask ide.c to sample
- * the tape status register on our behalf in the next call to do_request,
- * at the point in which the other device is idle, or assume that
- * DSC was received even though we won't verify it (but when we assume
- * that, it will usually have a solid basis).
+ * Memory for those requests is pre-allocated at initialization time, and
+ * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
+ * space for the maximum possible number of inter-dependent packet commands.
*
- * The use of cli () below is a must, as we inspect and change
- * the device request list while another request is active.
+ * The higher level of the driver - The ioctl handler and the character
+ * device handling functions should queue request to the lower level part
+ * and wait for their completion using idetape_queue_pc_tail or
+ * idetape_queue_rw_tail.
*/
-
-void idetape_poll_for_dsc (unsigned long data)
-
+static void idetape_queue_pc_head (ide_drive_t *drive,idetape_pc_t *pc,struct request *rq)
{
- ide_drive_t *drive=(ide_drive_t *) data;
unsigned int major = HWIF(drive)->major;
- idetape_tape_t *tape=&(drive->tape);
struct blk_dev_struct *bdev = &blk_dev[major];
- struct request *next_rq;
- unsigned long flags;
- idetape_status_reg_t status;
-
-#if IDETAPE_DEBUG_LOG
- printk ("%s: idetape_poll_for_dsc called\n",drive->name);
-#endif /* IDETAPE_DEBUG_LOG */
-
- save_flags (flags);cli ();
-
- /*
- * Check if the other device is idle. If there are no requests,
- * we can safely access the tape.
- */
-
- if (HWGROUP (drive)->rq == NULL) {
- sti ();
- idetape_poll_for_dsc_direct (data);
- return;
- }
-
- /*
- * If DSC was received, re-insert our postponed request into
- * the request queue (using ide_next).
- */
-
- status.all=tape->last_status;
-
- if (status.b.dsc) { /* DSC received */
- tape->dsc_received=1;
- idetape_put_back_postponed_request (drive);
- del_timer (&(tape->dsc_timer));
- restore_flags (flags);
- return;
- }
-
- /*
- * At this point, DSC may have been received, but we can't
- * check it. We now have two options:
- *
- * 1. The "simple" method - We can continue polling
- * until we know the value of DSC.
- *
- * but we also have a more clever option :-)
- *
- * 2. We can sometimes more or less anticipate in
- * advance how much time it will take for
- * the tape to perform the request. This is the
- * place to take advantage of this !
- *
- * We can assume that DSC was received, put
- * back our request, and hope that we will have
- * a "cache hit". This will only work when
- * we haven't initiated the packet command yet,
- * but this is the common read/write case. As
- * for the slower media access commands, fallback
- * to method 1 above.
- *
- * When using method 2, we can also take advantage of the
- * knowledge of the tape's internal buffer size - We can
- * precalculate the time it will take for the tape to complete
- * servicing not only one request, but rather, say, 50% of its
- * internal buffer. The polling period will then be much larger,
- * decreasing our load on Linux, and we will also call
- * idetape_postpone_request less often, as there will usually
- * be more room in the internal tape buffer while we are in
- * idetape_do_request.
- *
- * For this method to work well, the ongoing request of the
- * other device should be serviced by the time the tape is
- * still working on its remaining 50% internal buffer. This
- * will usually happen when the other device is much faster
- * than the tape.
- */
-
-#if IDETAPE_ANTICIPATE_READ_WRITE_DSC
-
- /*
- * Method 2.
- *
- * There is a high chance that DSC was received, even though
- * we couldn't verify it. Let's hope that it's a "cache hit"
- * rather than a "cache miss". Someday I will probably add a
- * feedback loop around the number of "cache hits" which will
- * fine-tune the polling period.
- */
-
- if (tape->postponed_rq->cmd != IDETAPE_PACKET_COMMAND_REQUEST_TYPE1) {
-
- /*
- * We can use this method only when the packet command
- * was still not initiated.
- */
-
- idetape_put_back_postponed_request (drive);
- del_timer (&(tape->dsc_timer));
- restore_flags (flags);
- return;
- }
-#endif /* IDETAPE_ANTICIPATE_READ_WRITE_DSC */
-
- /*
- * Fallback to method 1.
- */
-
- next_rq=bdev->current_request;
- if (next_rq == HWGROUP (drive)->rq)
- next_rq=next_rq->next;
-
- if (next_rq == NULL) {
-
- /*
- * There will not be another request after the currently
- * ongoing request, so ide.c won't be able to sample
- * the status register on our behalf in do_request.
- *
- * In case we are waiting for DSC before the packet
- * command was initiated, we will put back our postponed
- * request and have another look at the status register
- * in idetape_do_request, as done in method 2 above.
- *
- * In case we already initiated the command, we can't
- * put it back, but it is anyway a slow media access
- * command. We will just give up and poll again until
- * we are lucky.
- */
-
- if (tape->postponed_rq->cmd == IDETAPE_PACKET_COMMAND_REQUEST_TYPE1) {
-
- /*
- * Media access command - Poll again.
- *
- * We set tape->request_status to 1, just in case
- * other requests are added while we are waiting.
- */
-
- tape->request_status=1;
- restore_flags (flags);
- tape->dsc_timer.expires = jiffies + tape->dsc_polling_frequency;
- add_timer(&(tape->dsc_timer));
- return;
- }
-
- /*
- * The packet command hasn't been sent to the tape yet -
- * We can safely put back the request and have another
- * look at the status register in idetape_do_request.
- */
-
- idetape_put_back_postponed_request (drive);
- del_timer (&(tape->dsc_timer));
- restore_flags (flags);
- return;
- }
-
- /*
- * There will be another request after the current request.
- *
- * Request ide.c to sample for us the tape's status register
- * before the next request.
- */
-
- tape->request_status=1;
- restore_flags (flags);
- if (jiffies > tape->dsc_timeout) { /* Timeout */
- tape->dsc_received=0;
- /* ??? */
- idetape_put_back_postponed_request (drive);
- del_timer (&(tape->dsc_timer));
- restore_flags (flags);
- return;
- }
+ bdev->current_request=HWGROUP (drive)->rq; /* Since we may have taken it out */
- /* Poll again */
-
- if (jiffies - tape->dsc_polling_start > IDETAPE_FAST_SLOW_THRESHOLD)
- tape->dsc_timer.expires = jiffies + IDETAPE_DSC_SLOW_MEDIA_ACCESS_FREQUENCY;
- else
- tape->dsc_timer.expires = jiffies + tape->dsc_polling_frequency;
- add_timer(&(tape->dsc_timer));
- return;
+ ide_init_drive_cmd (rq);
+ rq->buffer = (char *) pc;
+ rq->cmd = IDETAPE_PC_RQ;
+ (void) ide_do_drive_cmd (drive, rq, ide_preempt);
}
/*
- * idetape_put_back_postponed_request gets called when we decided to
- * stop polling for DSC and continue servicing our postponed request.
+ * idetape_next_pc_storage returns a pointer to a place in which we can
+ * safely store a packet command, even though we intend to leave the
+ * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
+ * commands is allocated at initialization time.
*/
-
-void idetape_put_back_postponed_request (ide_drive_t *drive)
-
+static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
{
- idetape_tape_t *tape = &(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Putting back postponed request\n");
+ printk (KERN_INFO "ide-tape: pc_stack_index=%d\n",tape->pc_stack_index);
#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (tape->postponed_rq == NULL) {
- printk ("tape->postponed_rq is NULL in put_back_postponed_request\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- (void) ide_do_drive_cmd (drive, tape->postponed_rq, ide_next);
-
- /*
- * Note that the procedure done here is different than the method
- * we are using in idetape_queue_pc_head - There we are putting
- * request(s) before our currently called request.
- *
- * Here, on the other hand, HWGROUP(drive)->rq is not our
- * request but rather a request to another device. Therefore,
- * we will let it finish and only then service our postponed
- * request --> We don't touch HWGROUP(drive)->rq.
- */
+ if (tape->pc_stack_index==IDETAPE_PC_STACK)
+ tape->pc_stack_index=0;
+ return (&tape->pc_stack[tape->pc_stack_index++]);
}
-void idetape_media_access_finished (ide_drive_t *drive)
-
+/*
+ * idetape_next_rq_storage is used along with idetape_next_pc_storage.
+ * Since we queue packet commands in the request queue, we need to
+ * allocate a request, along with the allocation of a packet command.
+ */
+
+/**************************************************************
+ * *
+ * This should get fixed to use kmalloc(GFP_ATOMIC, ..) *
+ * followed later on by kfree(). -ml *
+ * *
+ **************************************************************/
+
+static struct request *idetape_next_rq_storage (ide_drive_t *drive)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_status_reg_t status;
- idetape_packet_command_t *pc;
-
- pc=tape->pc;
-
- status.all=IN_BYTE (IDETAPE_STATUS_REG);
+ idetape_tape_t *tape = drive->driver_data;
- if (tape->dsc_received) {
#if IDETAPE_DEBUG_LOG
- printk ("DSC received\n");
+ printk (KERN_INFO "ide-tape: rq_stack_index=%d\n",tape->rq_stack_index);
#endif /* IDETAPE_DEBUG_LOG */
- if (status.b.check) { /* Error detected */
- printk ("ide-tape: %s: I/O error, ",drive->name);
- idetape_retry_pc (drive); /* Retry operation */
- return;
- }
- pc->error=0;
- if (tape->failed_pc == pc)
- tape->failed_pc=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (pc->callback==NULL)
- printk ("ide-tape: ide-tape bug - Callback function not set !\n");
- else
-#endif /* IDETAPE_DEBUG_BUGS */
- (*pc->callback)(drive);
-
- return;
- }
- else {
- printk ("ide-tape: %s: DSC timeout.\n",drive->name);
- /* ??? */
- pc->error=1;
- tape->failed_pc=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (pc->callback==NULL)
- printk ("ide-tape: ide-tape bug - Callback function not set !\n");
- else
-#endif /* IDETAPE_DEBUG_BUGS */
- (*pc->callback)(drive);
- return;
- }
+ if (tape->rq_stack_index==IDETAPE_PC_STACK)
+ tape->rq_stack_index=0;
+ return (&tape->rq_stack[tape->rq_stack_index++]);
}
-
/*
- * idetape_retry_pc is called when an error was detected during the
- * last packet command. We queue a request sense packet command in
- * the head of the request list.
+ * Pipeline related functions
*/
-
-void idetape_retry_pc (ide_drive_t *drive)
+static inline int idetape_pipeline_active (idetape_tape_t *tape)
{
- idetape_tape_t *tape = &drive->tape;
- idetape_packet_command_t *pc;
- struct request *new_rq;
-
- idetape_error_reg_t error;
- error.all=IN_BYTE (IDETAPE_ERROR_REG);
- pc=idetape_next_pc_storage (drive);
- new_rq=idetape_next_rq_storage (drive);
- idetape_create_request_sense_cmd (pc);
- pc->buffer=pc->temp_buffer;
- pc->buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc->current_position=pc->temp_buffer;
- tape->reset_issued = 1;
- idetape_queue_pc_head (drive,pc,new_rq);
+ return tape->active_data_request != NULL;
}
/*
- * General packet command callback function.
+ * idetape_kfree_stage calls kfree to completely free a stage, along with
+ * its related buffers.
*/
-
-void idetape_pc_callback (ide_drive_t *drive)
-
+static void __idetape_kfree_stage (idetape_stage_t *stage)
{
- idetape_tape_t *tape;
- struct request *rq;
-
- tape=&(drive->tape);
- rq=HWGROUP(drive)->rq;
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_pc_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
- if (!tape->pc->error) {
-#if IDETAPE_DEBUG_LOG
- printk ("Request completed\n");
-#endif /* IDETAPE_DEBUG_LOG */
- idetape_end_request (1,HWGROUP (drive));
- }
- else {
- idetape_end_request (0,HWGROUP (drive));
+ struct buffer_head *prev_bh, *bh = stage->bh;
+ int size;
+
+ while (bh != NULL) {
+ if (bh->b_data != NULL) {
+ size = (int) bh->b_size;
+ while (size > 0) {
+ free_page ((unsigned long) bh->b_data);
+ size -= PAGE_SIZE;
+ bh->b_data += PAGE_SIZE;
+ }
+ }
+ prev_bh = bh;
+ bh = bh->b_reqnext;
+ kfree (prev_bh);
}
- return;
+ kfree (stage);
}
+static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
+{
+ if (tape->cache_stage == NULL)
+ tape->cache_stage = stage;
+ else
+ __idetape_kfree_stage (stage);
+}
-void idetape_read_callback (ide_drive_t *drive)
-
+/*
+ * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
+ * stage, along with all the necessary small buffers which together make
+ * a buffer of size tape->stage_size (or a bit more). We attempt to
+ * combine sequential pages as much as possible.
+ *
+ * Returns a pointer to the new allocated stage, or NULL if we
+ * can't (or don't want to) allocate a stage.
+ *
+ * Pipeline stages are optional and are used to increase performance.
+ * If we can't allocate them, we'll manage without them.
+ */
+static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape)
{
- idetape_tape_t *tape=&(drive->tape);
- struct request *rq=HWGROUP(drive)->rq;
- int blocks_read=tape->pc->actually_transferred/tape->tape_block_size;
+ idetape_stage_t *stage;
+ struct buffer_head *prev_bh, *bh;
+ int pages = tape->pages_per_stage;
+ char *b_data;
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_read_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
+ if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
+ return NULL;
+ stage->next = NULL;
- tape->block_address+=blocks_read;
- rq->current_nr_sectors-=blocks_read;
+ bh = stage->bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL);
+ if (bh == NULL)
+ goto abort;
+ bh->b_reqnext = NULL;
+ if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
+ goto abort;
+ bh->b_size = PAGE_SIZE;
+ set_bit (BH_Lock, &bh->b_state);
- if (!tape->pc->error)
- idetape_end_request (1,HWGROUP (drive));
- else {
- rq->errors=tape->pc->error;
- switch (rq->errors) {
- case IDETAPE_RQ_ERROR_FILEMARK:
- case IDETAPE_RQ_ERROR_EOD:
- break;
+ while (--pages) {
+ if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
+ goto abort;
+ if (bh->b_data == b_data + PAGE_SIZE && virt_to_bus (bh->b_data) == virt_to_bus (b_data) + PAGE_SIZE) {
+ bh->b_size += PAGE_SIZE;
+ bh->b_data -= PAGE_SIZE;
+ continue;
}
- idetape_end_request (0,HWGROUP (drive));
+ if (b_data == bh->b_data + bh->b_size && virt_to_bus (b_data) == virt_to_bus (bh->b_data) + bh->b_size) {
+ bh->b_size += PAGE_SIZE;
+ continue;
+ }
+ prev_bh = bh;
+ if ((bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL)) == NULL) {
+ free_page ((unsigned long) b_data);
+ goto abort;
+ }
+ bh->b_reqnext = NULL;
+ bh->b_data = b_data;
+ bh->b_size = PAGE_SIZE;
+ set_bit (BH_Lock, &bh->b_state);
+ prev_bh->b_reqnext = bh;
}
- return;
+ bh->b_size -= tape->excess_bh_size;
+ return stage;
+abort:
+ __idetape_kfree_stage (stage);
+ return NULL;
}
-void idetape_write_callback (ide_drive_t *drive)
-
+static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
{
- idetape_tape_t *tape=&(drive->tape);
- struct request *rq=HWGROUP(drive)->rq;
- int blocks_written=tape->pc->actually_transferred/tape->tape_block_size;
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_write_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
+ idetape_stage_t *cache_stage = tape->cache_stage;
- tape->block_address+=blocks_written;
- rq->current_nr_sectors-=blocks_written;
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_kmalloc_stage\n");
+#endif /* IDETAPE_DEBUG_LOG */
- if (!tape->pc->error)
- idetape_end_request (1,HWGROUP (drive));
- else {
- rq->errors=tape->pc->error;
- idetape_end_request (0,HWGROUP (drive));
+ if (tape->nr_stages >= tape->max_stages)
+ return NULL;
+ if (cache_stage != NULL) {
+ tape->cache_stage = NULL;
+ return cache_stage;
}
- return;
+ return __idetape_kmalloc_stage (tape);
}
-void idetape_inquiry_callback (ide_drive_t *drive)
-
+static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char *buf, int n)
{
- idetape_tape_t *tape;
-
- tape=&(drive->tape);
-
- idetape_display_inquiry_result (tape->pc->buffer);
- idetape_pc_callback (drive);
- return;
-}
+ struct buffer_head *bh = tape->bh;
+ int count;
-/*
- * idetape_input_data is called to read data from the tape's data
- * register. We basically let ide_input_data do the job, but we also
- * take care about the remaining bytes which can not be transferred
- * in 32-bit data transfers.
- */
-
-void idetape_input_data (ide_drive_t *drive,void *buffer, unsigned long bcount)
+ while (n) {
+#if IDETAPE_DEBUG_BUGS
+ if (bh == NULL) {
+ printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_from_user\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ count = IDETAPE_MIN (bh->b_size - bh->b_count, n);
+ copy_from_user (bh->b_data + bh->b_count, buf, count);
+ n -= count; bh->b_count += count; buf += count;
+ if (bh->b_count == bh->b_size) {
+ bh = bh->b_reqnext;
+ if (bh)
+ bh->b_count = 0;
+ }
+ }
+ tape->bh = bh;
+}
+static void idetape_copy_stage_to_user (idetape_tape_t *tape, char *buf, idetape_stage_t *stage, int n)
{
- unsigned long wcount;
-
- wcount=bcount >> 2;
- bcount -= 4*wcount;
-
- if (wcount)
- ide_input_data (drive,buffer,wcount);
-
- if (bcount) {
- ((byte *)buffer) += 4*wcount;
- insb (IDETAPE_DATA_REG,buffer,bcount);
+ struct buffer_head *bh = tape->bh;
+ int count;
+
+ while (n) {
+#if IDETAPE_DEBUG_BUGS
+ if (bh == NULL) {
+ printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_to_user\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ count = IDETAPE_MIN (tape->b_count, n);
+ copy_to_user (buf, tape->b_data, count);
+ n -= count; tape->b_data += count; tape->b_count -= count; buf += count;
+ if (!tape->b_count) {
+ tape->bh = bh = bh->b_reqnext;
+ if (bh) {
+ tape->b_data = bh->b_data;
+ tape->b_count = bh->b_count;
+ }
+ }
}
}
-/*
- * idetape_output_data is used to write data to the tape.
- */
-
-void idetape_output_data (ide_drive_t *drive,void *buffer, unsigned long bcount)
-
+static void idetape_init_merge_stage (idetape_tape_t *tape)
{
- unsigned long wcount;
-
- wcount=bcount >> 2;
- bcount -= 4*wcount;
-
- if (wcount)
- ide_output_data (drive,buffer,wcount);
+ struct buffer_head *bh = tape->merge_stage->bh;
- if (bcount) {
- ((byte *)buffer) += 4*wcount;
- outsb (IDETAPE_DATA_REG,buffer,bcount);
+ tape->bh = bh;
+ if (tape->chrdev_direction == idetape_direction_write)
+ bh->b_count = 0;
+ else {
+ tape->b_data = bh->b_data;
+ tape->b_count = bh->b_count;
}
}
+static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
+{
+ struct buffer_head *tmp;
+
+ tmp = stage->bh;
+ stage->bh = tape->merge_stage->bh;
+ tape->merge_stage->bh = tmp;
+ idetape_init_merge_stage (tape);
+}
+
/*
- * Too bad. The drive wants to send us data which we are not ready to accept.
- * Just throw it away.
+ * idetape_increase_max_pipeline_stages is a part of the feedback
+ * loop which tries to find the optimum number of stages. In the
+ * feedback loop, we are starting from a minimum maximum number of
+ * stages, and if we sense that the pipeline is empty, we try to
+ * increase it, until we reach the user compile time memory limit.
*/
-
-void idetape_discard_data (ide_drive_t *drive, unsigned long bcount)
-
+static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
{
- unsigned long i;
+ idetape_tape_t *tape = drive->driver_data;
- for (i=0;i<bcount;i++)
- IN_BYTE (IDETAPE_DATA_REG);
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_increase_max_pipeline_stages\n");
+#endif /* IDETAPE_DEBUG_LOG */
+
+ tape->max_stages = IDETAPE_MIN (tape->max_stages + IDETAPE_INCREASE_STAGES_RATE, IDETAPE_MAX_PIPELINE_STAGES);
}
/*
- * Issue an INQUIRY packet command.
+ * idetape_add_stage_tail adds a new stage at the end of the pipeline.
*/
-
-void idetape_create_inquiry_cmd (idetape_packet_command_t *pc)
-
+static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating INQUIRY packet command\n");
-#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=36;
- pc->callback=&idetape_inquiry_callback;
- pc->writing=0;
+ idetape_tape_t *tape = drive->driver_data;
+ unsigned long flags;
- idetape_zero_packet_command (pc);
- pc->c[0]=IDETAPE_INQUIRY_CMD;
- pc->c[4]=255;
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_add_stage_tail\n");
+#endif /* IDETAPE_DEBUG_LOG */
+ save_flags (flags);
+ cli ();
+ stage->next=NULL;
+ if (tape->last_stage != NULL)
+ tape->last_stage->next=stage;
+ else
+ tape->first_stage=tape->next_stage=stage;
+ tape->last_stage=stage;
+ if (tape->next_stage == NULL)
+ tape->next_stage=tape->last_stage;
+ tape->nr_stages++;
+ tape->nr_pending_stages++;
+ restore_flags (flags);
}
/*
- * Format the INQUIRY command results.
+ * idetape_remove_stage_head removes tape->first_stage from the pipeline.
+ * The caller should avoid race conditions.
*/
-
-void idetape_display_inquiry_result (byte *buffer)
-
+static void idetape_remove_stage_head (ide_drive_t *drive)
{
- idetape_inquiry_result_t *result;
-
- result=(idetape_inquiry_result_t *) buffer;
- ide_fixstring (result->vendor_id,8,0);
- ide_fixstring (result->product_id,16,0);
- ide_fixstring (result->revision_level,4,0);
-
- if (result->response_format != 2) {
- printk ("The INQUIRY Data Format is unknown to us !\n");
- printk ("Assuming QIC-157C format.\n");
- }
-
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *stage;
+
#if IDETAPE_DEBUG_LOG
- printk ("Dumping INQUIRY command results:\n");
- printk ("Response Data Format: %d - ",result->response_format);
- switch (result->response_format) {
- case 2:
- printk ("As specified in QIC-157 Revision C\n");
- break;
- default:
- printk ("Unknown\n");
- break;
+ printk (KERN_INFO "Reached idetape_remove_stage_head\n");
+#endif /* IDETAPE_DEBUG_LOG */
+#if IDETAPE_DEBUG_BUGS
+ if (tape->first_stage == NULL) {
+ printk (KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
+ return;
}
-
- printk ("Device Type: %x - ",result->device_type);
- switch (result->device_type) {
- case 0: printk ("Direct-access Device\n");break;
- case 1: printk ("Streaming Tape Device\n");break;
- case 2: case 3: case 4: printk ("Reserved\n");break;
- case 5: printk ("CD-ROM Device\n");break;
- case 6: printk ("Reserved\n");
- case 7: printk ("Optical memory Device\n");break;
- case 0x1f: printk ("Unknown or no Device type\n");break;
- default: printk ("Reserved\n");
+ if (tape->active_stage == tape->first_stage) {
+ printk (KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
+ return;
}
-
- printk ("Removable Medium: %s",result->rmb ? "Yes\n":"No\n");
-
- printk ("ANSI Version: %d - ",result->ansi_version);
- switch (result->ansi_version) {
- case 2:
- printk ("QIC-157 Revision C\n");
- break;
- default:
- printk ("Unknown\n");
- break;
+#endif /* IDETAPE_DEBUG_BUGS */
+ stage=tape->first_stage;
+ tape->first_stage=stage->next;
+ idetape_kfree_stage (tape, stage);
+ tape->nr_stages--;
+ if (tape->first_stage == NULL) {
+ tape->last_stage=NULL;
+#if IDETAPE_DEBUG_BUGS
+ if (tape->next_stage != NULL)
+ printk (KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
+ if (tape->nr_stages)
+ printk (KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
+#endif /* IDETAPE_DEBUG_BUGS */
}
+}
- printk ("ECMA Version: ");
- if (result->ecma_version)
- printk ("%d\n",result->ecma_version);
- else
- printk ("Not supported\n");
-
- printk ("ISO Version: ");
- if (result->iso_version)
- printk ("%d\n",result->iso_version);
- else
- printk ("Not supported\n");
+/*
+ * idetape_active_next_stage will declare the next stage as "active".
+ */
+static void idetape_active_next_stage (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *stage=tape->next_stage;
+ struct request *rq = &stage->rq;
- printk ("Additional Length: %d\n",result->additional_length);
- printk ("Vendor Identification: %s\n",result->vendor_id);
- printk ("Product Identification: %s\n",result->product_id);
- printk ("Product Revision Level: %s\n",result->revision_level);
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_active_next_stage\n");
#endif /* IDETAPE_DEBUG_LOG */
+#if IDETAPE_DEBUG_BUGS
+ if (stage == NULL) {
+ printk (KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
+ return;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
- if (result->device_type != 1)
- printk ("Device type is not set to tape\n");
+ rq->buffer = NULL;
+ rq->bh = stage->bh;
+ tape->active_data_request=rq;
+ tape->active_stage=stage;
+ tape->next_stage=stage->next;
+}
- if (!result->rmb)
- printk ("The removable flag is not set\n");
+/*
+ * idetape_insert_pipeline_into_queue is used to start servicing the
+ * pipeline stages, starting from tape->next_stage.
+ */
+static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
- if (result->ansi_version != 2) {
- printk ("The Ansi Version is unknown to us !\n");
- printk ("Assuming compliance with QIC-157C specification.\n");
+ if (tape->next_stage == NULL)
+ return;
+ if (!idetape_pipeline_active (tape)) {
+ idetape_active_next_stage (drive);
+ (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end);
}
}
-void idetape_create_request_sense_cmd (idetape_packet_command_t *pc)
-
+static void idetape_abort_pipeline (ide_drive_t *drive)
{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating REQUEST SENSE packet command\n");
-#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=18;
- pc->callback=&idetape_request_sense_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c[0]=IDETAPE_REQUEST_SENSE_CMD;
- pc->c[4]=255;
-}
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *stage = tape->next_stage;
-void idetape_request_sense_callback (ide_drive_t *drive)
+ while (stage) {
+ stage->rq.cmd = IDETAPE_ABORTED_WRITE_RQ;
+ stage = stage->next;
+ }
+}
+/*
+ * idetape_end_request is used to finish servicing a request, and to
+ * insert a pending pipeline request into the main device queue.
+ */
+static void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
{
- idetape_tape_t *tape=&(drive->tape);
+ ide_drive_t *drive = hwgroup->drive;
+ struct request *rq = hwgroup->rq;
+ idetape_tape_t *tape = drive->driver_data;
+ unsigned int major = HWIF(drive)->major;
+ struct blk_dev_struct *bdev = &blk_dev[major];
+ int error;
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_request_sense_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
- if (!tape->pc->error) {
-#if IDETAPE_DEBUG_LOG
- printk ("Request completed\n");
+ printk (KERN_INFO "Reached idetape_end_request\n");
#endif /* IDETAPE_DEBUG_LOG */
- idetape_analyze_error (drive,(idetape_request_sense_result_t *) tape->pc->buffer);
- idetape_end_request (1,HWGROUP (drive));
- }
- else {
- printk ("Error in REQUEST SENSE itself - Aborting request!\n");
- idetape_end_request (0,HWGROUP (drive));
+
+ bdev->current_request=rq; /* Since we may have taken it out */
+
+ switch (uptodate) {
+ case 0: error = IDETAPE_ERROR_GENERAL; break;
+ case 1: error = 0; break;
+ default: error = uptodate;
+ }
+ rq->errors = error;
+ if (error)
+ tape->failed_pc = NULL;
+
+ if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */
+ tape->active_stage = NULL;
+ tape->active_data_request = NULL;
+ tape->nr_pending_stages--;
+ if (rq->cmd == IDETAPE_WRITE_RQ) {
+ if (error) {
+ set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
+ if (error == IDETAPE_ERROR_EOD)
+ idetape_abort_pipeline (drive);
+ }
+ idetape_remove_stage_head (drive);
+ }
+ if (tape->next_stage != NULL) {
+ idetape_active_next_stage (drive);
+
+ /*
+ * Insert the next request into the request queue.
+ * The choice of using ide_next or ide_end is now left to the user.
+ */
+#if IDETAPE_LOW_TAPE_PRIORITY
+ (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end);
+#else
+ (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_next);
+#endif /* IDETAPE_LOW_TAPE_PRIORITY */
+ } else if (!error)
+ idetape_increase_max_pipeline_stages (drive);
}
- return;
+ ide_end_drive_cmd (drive, 0, 0);
}
/*
@@ -2449,515 +1659,603 @@
* to analyze the request sense. We currently do not utilize this
* information.
*/
-
-void idetape_analyze_error (ide_drive_t *drive,idetape_request_sense_result_t *result)
-
+static void idetape_analyze_error (ide_drive_t *drive,idetape_request_sense_result_t *result)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_packet_command_t *pc=tape->failed_pc;
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t *pc = tape->failed_pc;
- tape->sense_key=result->sense_key;
- tape->asc=result->asc;
- tape->ascq=result->ascq;
-
-#if IDETAPE_DEBUG_LOG
+ tape->sense_key = result->sense_key; tape->asc = result->asc; tape->ascq = result->ascq;
+#if IDETAPE_DEBUG_LOG
/*
* Without debugging, we only log an error if we decided to
* give up retrying.
*/
- printk ("ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n",pc->c[0],result->sense_key,result->asc,result->ascq);
+ printk (KERN_INFO "ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n",pc->c[0],result->sense_key,result->asc,result->ascq);
#endif /* IDETAPE_DEBUG_LOG */
- if (pc->c[0] == IDETAPE_READ_CMD) {
- if (result->filemark) {
- pc->error=IDETAPE_RQ_ERROR_FILEMARK;
- pc->abort=1;
- }
- }
-
- if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
- if (result->sense_key == 8) {
- pc->error=IDETAPE_RQ_ERROR_EOD;
- pc->abort=1;
- }
- }
-
-#if 1
#ifdef CONFIG_BLK_DEV_TRITON
/*
* Correct pc->actually_transferred by asking the tape.
*/
-
- if (pc->dma_error && pc->abort) {
- unsigned long *long_ptr=(unsigned long *) &(result->information1);
- pc->actually_transferred=pc->request_transfer-tape->tape_block_size*idetape_swap_long (*long_ptr);
- }
+ if (test_bit (PC_DMA_ERROR, &pc->flags)) {
+ pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl (get_unaligned (&result->information));
+ idetape_update_buffers (pc);
+ }
#endif /* CONFIG_BLK_DEV_TRITON */
-#endif
-}
-
-void idetape_create_test_unit_ready_cmd (idetape_packet_command_t *pc)
-
-{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating TEST UNIT READY packet command\n");
-#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c[0]=IDETAPE_TEST_UNIT_READY_CMD;
+ if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
+ pc->error = IDETAPE_ERROR_FILEMARK;
+ set_bit (PC_ABORT, &pc->flags);
+ }
+ if (pc->c[0] == IDETAPE_WRITE_CMD) {
+ if (result->eom || (result->sense_key == 0xd && result->asc == 0x0 && result->ascq == 0x2)) {
+ pc->error = IDETAPE_ERROR_EOD;
+ set_bit (PC_ABORT, &pc->flags);
+ }
+ }
+ if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
+ if (result->sense_key == 8) {
+ pc->error = IDETAPE_ERROR_EOD;
+ set_bit (PC_ABORT, &pc->flags);
+ }
+ if (!test_bit (PC_ABORT, &pc->flags) && pc->actually_transferred)
+ pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
+ }
}
-void idetape_create_locate_cmd (idetape_packet_command_t *pc,unsigned long block,byte partition)
-
+static void idetape_request_sense_callback (ide_drive_t *drive)
{
- unsigned long *ptr;
+ idetape_tape_t *tape = drive->driver_data;
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating LOCATE packet command\n");
+ printk (KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_LOCATE_CMD;
- pc->c [1]=2;
- ptr=(unsigned long *) &(pc->c[3]);
- *ptr=idetape_swap_long (block);
- pc->c[8]=partition;
+ if (!tape->pc->error) {
+ idetape_analyze_error (drive,(idetape_request_sense_result_t *) tape->pc->buffer);
+ idetape_end_request (1,HWGROUP (drive));
+ } else {
+ printk (KERN_ERR "Error in REQUEST SENSE itself - Aborting request!\n");
+ idetape_end_request (0,HWGROUP (drive));
+ }
}
-void idetape_create_rewind_cmd (idetape_packet_command_t *pc)
-
+/*
+ * idetape_init_pc initializes a packet command.
+ */
+static void idetape_init_pc (idetape_pc_t *pc)
{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating REWIND packet command\n");
-#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_REWIND_CMD;
+ memset (pc->c, 0, 12);
+ pc->retries = 0;
+ pc->flags = 0;
+ pc->request_transfer = 0;
+ pc->buffer = pc->pc_buffer;
+ pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
+ pc->bh = NULL;
+ pc->b_data = NULL;
+}
+
+static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
+ pc->c[4] = 255;
+ pc->request_transfer = 18;
+ pc->callback = &idetape_request_sense_callback;
}
/*
- * A mode sense command is used to "sense" tape parameters.
+ * idetape_retry_pc is called when an error was detected during the
+ * last packet command. We queue a request sense packet command in
+ * the head of the request list.
*/
-
-void idetape_create_mode_sense_cmd (idetape_packet_command_t *pc,byte page_code)
-
+static void idetape_retry_pc (ide_drive_t *drive)
{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating MODE SENSE packet command - Page %d\n",page_code);
-#endif /* IDETAPE_DEBUG_LOG */
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t *pc;
+ struct request *rq;
+ idetape_error_reg_t error;
- pc->wait_for_dsc=0;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- switch (page_code) {
- case IDETAPE_CAPABILITIES_PAGE:
- pc->request_transfer=24;
- }
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_MODE_SENSE_CMD;
- pc->c [1]=8; /* DBD = 1 - Don't return block descriptors for now */
- pc->c [2]=page_code;
- pc->c [3]=255; /* Don't limit the returned information */
- pc->c [4]=255; /* (We will just discard data in that case) */
+ error.all = IN_BYTE (IDE_ERROR_REG);
+ pc = idetape_next_pc_storage (drive);
+ rq = idetape_next_rq_storage (drive);
+ idetape_create_request_sense_cmd (pc);
+ set_bit (IDETAPE_IGNORE_DSC, &tape->flags);
+ idetape_queue_pc_head (drive, pc, rq);
}
/*
- * idetape_create_write_filemark_cmd will:
- *
- * 1. Write a filemark if write_filemark=1.
- * 2. Flush the device buffers without writing a filemark
- * if write_filemark=0.
+ * idetape_pc_intr is the usual interrupt handler which will be called
+ * during a packet command. We will transfer some of the data (as
+ * requested by the drive) and will re-point interrupt handler to us.
+ * When data transfer is finished, we will act according to the
+ * algorithm described before idetape_issue_packet_command.
*
*/
-
-void idetape_create_write_filemark_cmd (idetape_packet_command_t *pc,int write_filemark)
-
+static void idetape_pc_intr (ide_drive_t *drive)
{
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_status_reg_t status;
+ idetape_bcount_reg_t bcount;
+ idetape_ireason_reg_t ireason;
+ idetape_pc_t *pc=tape->pc;
+ unsigned int temp;
+
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "ide-tape: Reached idetape_pc_intr interrupt handler\n");
+#endif /* IDETAPE_DEBUG_LOG */
+
+#ifdef CONFIG_BLK_DEV_TRITON
+ if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
+ if (HWIF(drive)->dmaproc(ide_dma_status_bad, drive)) {
+ set_bit (PC_DMA_ERROR, &pc->flags);
+ /*
+ * We will currently correct the following in
+ * idetape_analyze_error.
+ */
+ pc->actually_transferred=HWIF(drive)->dmaproc(ide_dma_transferred, drive);
+ } else {
+ pc->actually_transferred=pc->request_transfer;
+ idetape_update_buffers (pc);
+ }
+ (void) (HWIF(drive)->dmaproc(ide_dma_abort, drive)); /* End DMA */
#if IDETAPE_DEBUG_LOG
- printk ("Creating WRITE FILEMARK packet command\n");
- if (!write_filemark)
- printk ("which will only flush buffered data\n");
+ printk (KERN_INFO "ide-tape: DMA finished\n");
#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_WRITE_FILEMARK_CMD;
- if (write_filemark)
- pc->c [4]=1;
-}
+ }
+#endif /* CONFIG_BLK_DEV_TRITON */
-void idetape_create_load_unload_cmd (idetape_packet_command_t *pc,int cmd)
+ status.all = GET_STAT(); /* Clear the interrupt */
-{
+ if (!status.b.drq) { /* No more interrupts */
#if IDETAPE_DEBUG_LOG
- printk ("Creating LOAD UNLOAD packet command, cmd=%d\n",cmd);
+ printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
#endif /* IDETAPE_DEBUG_LOG */
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_LOAD_UNLOAD_CMD;
- pc->c [4]=cmd;
-}
+ clear_bit (PC_DMA_IN_PROGRESS, &pc->flags);
-void idetape_create_erase_cmd (idetape_packet_command_t *pc)
-
-{
+ ide_sti();
+ if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) { /* Error detected */
#if IDETAPE_DEBUG_LOG
- printk ("Creating ERASE command\n");
+ printk (KERN_INFO "ide-tape: %s: I/O error, ",tape->name);
#endif /* IDETAPE_DEBUG_LOG */
+ if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
+ printk (KERN_ERR "ide-tape: I/O error in request sense command\n");
+ ide_do_reset (drive);
+ return;
+ }
+ idetape_retry_pc (drive); /* Retry operation */
+ return;
+ }
+ pc->error = 0;
+ if (test_bit (PC_WAIT_FOR_DSC, &pc->flags) && !status.b.dsc) { /* Media access command */
+ tape->dsc_polling_start = jiffies;
+ tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
+ tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
+ idetape_postpone_request (drive); /* Allow ide.c to handle other requests */
+ return;
+ }
+ if (tape->failed_pc == pc)
+ tape->failed_pc=NULL;
+ pc->callback(drive); /* Command finished - Call the callback function */
+ return;
+ }
+#ifdef CONFIG_BLK_DEV_TRITON
+ if (clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
+ printk (KERN_ERR "ide-tape: The tape wants to issue more interrupts in DMA mode\n");
+ printk (KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
+ drive->using_dma=0;
+ ide_do_reset (drive);
+ return;
+ }
+#endif /* CONFIG_BLK_DEV_TRITON */
+ bcount.b.high=IN_BYTE (IDE_BCOUNTH_REG); /* Get the number of bytes to transfer */
+ bcount.b.low=IN_BYTE (IDE_BCOUNTL_REG); /* on this interrupt */
+ ireason.all=IN_BYTE (IDE_IREASON_REG);
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_ERASE_CMD;
- pc->c [1]=1;
-}
-
-void idetape_create_read_cmd (idetape_packet_command_t *pc,unsigned long length)
-
-{
- union convert {
- unsigned all :32;
- struct {
- unsigned b1 :8;
- unsigned b2 :8;
- unsigned b3 :8;
- unsigned b4 :8;
- } b;
- } original;
-
+ if (ireason.b.cod) {
+ printk (KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
+ ide_do_reset (drive);
+ return;
+ }
+ if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) { /* Hopefully, we will never get here */
+ printk (KERN_ERR "ide-tape: We wanted to %s, ", ireason.b.io ? "Write":"Read");
+ printk (KERN_ERR "but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write");
+ ide_do_reset (drive);
+ return;
+ }
+ if (!test_bit (PC_WRITING, &pc->flags)) { /* Reading - Check that we have enough space */
+ temp = pc->actually_transferred + bcount.all;
+ if ( temp > pc->request_transfer) {
+ if (temp > pc->buffer_size) {
+ printk (KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
+ idetape_discard_data (drive,bcount.all);
+ ide_set_handler (drive,&idetape_pc_intr,WAIT_CMD);
+ return;
+ }
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating READ packet command\n");
+ printk (KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
#endif /* IDETAPE_DEBUG_LOG */
+ }
+ }
+ if (test_bit (PC_WRITING, &pc->flags)) {
+ if (pc->bh != NULL)
+ idetape_output_buffers (drive, pc, bcount.all);
+ else
+ atapi_output_bytes (drive,pc->current_position,bcount.all); /* Write the current buffer */
+ } else {
+ if (pc->bh != NULL)
+ idetape_input_buffers (drive, pc, bcount.all);
+ else
+ atapi_input_bytes (drive,pc->current_position,bcount.all); /* Read the current buffer */
+ }
+ pc->actually_transferred+=bcount.all; /* Update the current position */
+ pc->current_position+=bcount.all;
+
+ ide_set_handler (drive,&idetape_pc_intr,WAIT_CMD); /* And set the interrupt handler again */
+}
+
+/*
+ * Packet Command Interface
+ *
+ * The current Packet Command is available in tape->pc, and will not
+ * change until we finish handling it. Each packet command is associated
+ * with a callback function that will be called when the command is
+ * finished.
+ *
+ * The handling will be done in three stages:
+ *
+ * 1. idetape_issue_packet_command will send the packet command to the
+ * drive, and will set the interrupt handler to idetape_pc_intr.
+ *
+ * 2. On each interrupt, idetape_pc_intr will be called. This step
+ * will be repeated until the device signals us that no more
+ * interrupts will be issued.
+ *
+ * 3. ATAPI Tape media access commands have immediate status with a
+ * delayed process. In case of a successful initiation of a
+ * media access packet command, the DSC bit will be set when the
+ * actual execution of the command is finished.
+ * Since the tape drive will not issue an interrupt, we have to
+ * poll for this event. In this case, we define the request as
+ * "low priority request" by setting rq_status to
+ * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
+ * the driver.
+ *
+ * ide.c will then give higher priority to requests which
+ * originate from the other device, until will change rq_status
+ * to RQ_ACTIVE.
+ *
+ * 4. When the packet command is finished, it will be checked for errors.
+ *
+ * 5. In case an error was found, we queue a request sense packet command
+ * in front of the request queue and retry the operation up to
+ * IDETAPE_MAX_PC_RETRIES times.
+ *
+ * 6. In case no error was found, or we decided to give up and not
+ * to retry again, the callback function will be called and then
+ * we will handle the next request.
+ *
+ */
+static void idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_bcount_reg_t bcount;
+ idetape_ireason_reg_t ireason;
+ int dma_ok=0;
+
+#if IDETAPE_DEBUG_BUGS
+ if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
+ printk (KERN_ERR "ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n");
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+
+ if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
+ tape->failed_pc=pc;
+ tape->pc=pc; /* Set the current packet command */
- original.all=length;
+ if (pc->retries > IDETAPE_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) {
+ /*
+ * We will "abort" retrying a packet command in case
+ * a legitimate error code was received (crossing a
+ * filemark, or DMA error in the end of media, for
+ * example).
+ */
+ if (!test_bit (PC_ABORT, &pc->flags)) {
+ printk (KERN_ERR "ide-tape: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n",
+ tape->name, pc->c[0], tape->sense_key, tape->asc, tape->ascq);
+ pc->error = IDETAPE_ERROR_GENERAL; /* Giving up */
+ }
+ tape->failed_pc=NULL;
+ pc->callback(drive);
+ return;
+ }
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Retry number - %d\n",pc->retries);
+#endif /* IDETAPE_DEBUG_LOG */
- pc->wait_for_dsc=0;
- pc->callback=&idetape_read_callback;
- pc->writing=0;
+ pc->retries++;
+ pc->actually_transferred=0; /* We haven't transferred any data yet */
+ pc->current_position=pc->buffer;
+ bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */
- idetape_zero_packet_command (pc);
+#ifdef CONFIG_BLK_DEV_TRITON
+ if (clear_bit (PC_DMA_ERROR, &pc->flags)) {
+ printk (KERN_WARNING "ide-tape: DMA disabled, reverting to PIO\n");
+ drive->using_dma=0;
+ }
+ if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
+ dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
+#endif /* CONFIG_BLK_DEV_TRITON */
- pc->c [0]=IDETAPE_READ_CMD;
- pc->c [1]=1;
- pc->c [4]=original.b.b1;
- pc->c [3]=original.b.b2;
- pc->c [2]=original.b.b3;
+ OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
+ OUT_BYTE (dma_ok ? 1:0,IDE_FEATURE_REG); /* Use PIO/DMA */
+ OUT_BYTE (bcount.b.high,IDE_BCOUNTH_REG);
+ OUT_BYTE (bcount.b.low,IDE_BCOUNTL_REG);
+ OUT_BYTE (drive->select.all,IDE_SELECT_REG);
- if (length)
- pc->dma_recommended=1;
+ ide_set_handler (drive, &idetape_pc_intr, WAIT_CMD); /* Set the interrupt routine */
+ OUT_BYTE (WIN_PACKETCMD,IDE_COMMAND_REG); /* Issue the packet command */
- return;
+ if (ide_wait_stat (drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { /* Wait for DRQ to be ready - Assuming Accelerated DRQ */
+ /*
+ * We currently only support tape drives which report
+ * accelerated DRQ assertion. For this case, specs
+ * allow up to 50us. We really shouldn't get here.
+ *
+ * ??? Still needs to think what to do if we reach
+ * here anyway.
+ */
+ printk (KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
+ return;
+ }
+ ireason.all=IN_BYTE (IDE_IREASON_REG);
+ if (!ireason.b.cod || ireason.b.io) {
+ printk (KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n");
+ ide_do_reset (drive);
+ return;
+ }
+ atapi_output_bytes (drive,pc->c,12); /* Send the actual packet */
+#ifdef CONFIG_BLK_DEV_TRITON
+ if (dma_ok) { /* Begin DMA, if necessary */
+ set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
+ (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
+ }
+#endif /* CONFIG_BLK_DEV_TRITON */
}
-void idetape_create_space_cmd (idetape_packet_command_t *pc,long count,byte cmd)
+static void idetape_media_access_finished (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t *pc = tape->pc;
+ idetape_status_reg_t status;
+
+ status.all = GET_STAT();
+ if (status.b.dsc) {
+ if (status.b.check) { /* Error detected */
+ printk (KERN_ERR "ide-tape: %s: I/O error, ",tape->name);
+ idetape_retry_pc (drive); /* Retry operation */
+ return;
+ }
+ pc->error = 0;
+ if (tape->failed_pc == pc)
+ tape->failed_pc = NULL;
+ } else {
+ pc->error = IDETAPE_ERROR_GENERAL;
+ tape->failed_pc = NULL;
+ }
+ pc->callback (drive);
+}
+/*
+ * General packet command callback function.
+ */
+static void idetape_pc_callback (ide_drive_t *drive)
{
- union convert {
- unsigned all :32;
- struct {
- unsigned b1 :8;
- unsigned b2 :8;
- unsigned b3 :8;
- unsigned b4 :8;
- } b;
- } original;
+ idetape_tape_t *tape = drive->driver_data;
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating SPACE packet command\n");
+ printk (KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
#endif /* IDETAPE_DEBUG_LOG */
- original.all=count;
+ idetape_end_request (tape->pc->error ? 0:1, HWGROUP(drive));
+}
- pc->request_transfer=0;
- pc->buffer=NULL;
- pc->current_position=NULL;
- pc->buffer_size=0;
- pc->wait_for_dsc=1;
- pc->callback=&idetape_pc_callback;
- pc->writing=0;
-
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_SPACE_CMD;
- pc->c [1]=cmd;
- pc->c [4]=original.b.b1;
- pc->c [3]=original.b.b2;
- pc->c [2]=original.b.b3;
-
- return;
-}
-
-void idetape_create_write_cmd (idetape_packet_command_t *pc,unsigned long length)
-
-{
- union convert {
- unsigned all :32;
- struct {
- unsigned b1 :8;
- unsigned b2 :8;
- unsigned b3 :8;
- unsigned b4 :8;
- } b;
- } original;
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating WRITE packet command\n");
+static void idetape_rw_callback (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct request *rq = HWGROUP(drive)->rq;
+ int blocks = tape->pc->actually_transferred / tape->tape_block_size;
+
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
#endif /* IDETAPE_DEBUG_LOG */
- original.all=length;
+ tape->block_address += blocks;
+ rq->current_nr_sectors -= blocks;
- pc->wait_for_dsc=0;
- pc->callback=&idetape_write_callback;
- pc->writing=1;
+ if (!tape->pc->error)
+ idetape_end_request (1, HWGROUP (drive));
+ else
+ idetape_end_request (tape->pc->error, HWGROUP (drive));
+}
- idetape_zero_packet_command (pc);
+static void idetape_create_locate_cmd (idetape_pc_t *pc, unsigned int block, byte partition)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_LOCATE_CMD;
+ pc->c[1] = 2;
+ put_unaligned (htonl (block), (unsigned int *) &pc->c[3]);
+ pc->c[8] = partition;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
+}
- pc->c [0]=IDETAPE_WRITE_CMD;
- pc->c [1]=1;
- pc->c [4]=original.b.b1;
- pc->c [3]=original.b.b2;
- pc->c [2]=original.b.b3;
+static void idetape_create_rewind_cmd (idetape_pc_t *pc)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_REWIND_CMD;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
+}
- if (length)
- pc->dma_recommended=1;
+/*
+ * A mode sense command is used to "sense" tape parameters.
+ */
+static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, byte page_code)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_MODE_SENSE_CMD;
+ pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors for now */
+ pc->c[2] = page_code;
+ pc->c[3] = 255; /* Don't limit the returned information */
+ pc->c[4] = 255; /* (We will just discard data in that case) */
+ if (page_code == IDETAPE_CAPABILITIES_PAGE)
+ pc->request_transfer = 24;
+#if IDETAPE_DEBUG_BUGS
+ else
+ printk (KERN_ERR "ide-tape: unsupported page code in create_mode_sense_cmd\n");
+#endif /* IDETAPE_DEBUG_BUGS */
+ pc->callback = &idetape_pc_callback;
+}
- return;
+/*
+ * idetape_create_write_filemark_cmd will:
+ *
+ * 1. Write a filemark if write_filemark=1.
+ * 2. Flush the device buffers without writing a filemark
+ * if write_filemark=0.
+ *
+ */
+static void idetape_create_write_filemark_cmd (idetape_pc_t *pc,int write_filemark)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
+ pc->c[4] = write_filemark;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
}
-void idetape_create_read_position_cmd (idetape_packet_command_t *pc)
+static void idetape_create_load_unload_cmd (idetape_pc_t *pc,int cmd)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
+ pc->c[4] = cmd;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
+}
+static void idetape_create_erase_cmd (idetape_pc_t *pc)
{
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Creating READ POSITION packet command\n");
-#endif /* IDETAPE_DEBUG_LOG */
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_ERASE_CMD;
+ pc->c[1] = 1;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
+}
- pc->request_transfer=20;
- pc->wait_for_dsc=0;
- pc->callback=&idetape_read_position_callback;
- pc->writing=0;
+static void idetape_create_read_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_READ_CMD;
+ put_unaligned (htonl (length), (unsigned int *) &pc->c[1]);
+ pc->c[1] = 1;
+ pc->callback = &idetape_rw_callback;
+ pc->bh = bh;
+ bh->b_count = 0;
+ pc->buffer = NULL;
+ pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
+ if (pc->request_transfer == tape->stage_size)
+ set_bit (PC_DMA_RECOMMENDED, &pc->flags);
+}
- idetape_zero_packet_command (pc);
- pc->c [0]=IDETAPE_READ_POSITION_CMD;
- pc->c [1]=0;
+static void idetape_create_space_cmd (idetape_pc_t *pc,int count,byte cmd)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_SPACE_CMD;
+ put_unaligned (htonl (count), (unsigned int *) &pc->c[1]);
+ pc->c[1] = cmd;
+ set_bit (PC_WAIT_FOR_DSC, &pc->flags);
+ pc->callback = &idetape_pc_callback;
}
-void idetape_read_position_callback (ide_drive_t *drive)
+static void idetape_create_write_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh)
+{
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_WRITE_CMD;
+ put_unaligned (htonl (length), (unsigned int *) &pc->c[1]);
+ pc->c[1] = 1;
+ pc->callback = &idetape_rw_callback;
+ set_bit (PC_WRITING, &pc->flags);
+ pc->bh = bh;
+ pc->b_data = bh->b_data;
+ pc->b_count = bh->b_count;
+ pc->buffer = NULL;
+ pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
+ if (pc->request_transfer == tape->stage_size)
+ set_bit (PC_DMA_RECOMMENDED, &pc->flags);
+}
+static void idetape_read_position_callback (ide_drive_t *drive)
{
- idetape_tape_t *tape;
- struct request *rq;
+ idetape_tape_t *tape = drive->driver_data;
idetape_read_position_result_t *result;
- tape=&(drive->tape);
-
#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_read_position_callback\n");
+ printk (KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
#endif /* IDETAPE_DEBUG_LOG */
- rq=HWGROUP(drive)->rq;
-
if (!tape->pc->error) {
- result=(idetape_read_position_result_t *) tape->pc->buffer;
+ result = (idetape_read_position_result_t *) tape->pc->buffer;
#if IDETAPE_DEBUG_LOG
- printk ("Request completed\n");
- printk ("Dumping the results of the READ POSITION command\n");
- printk ("BOP - %s\n",result->bop ? "Yes":"No");
- printk ("EOP - %s\n",result->eop ? "Yes":"No");
+ printk (KERN_INFO "BOP - %s\n",result->bop ? "Yes":"No");
+ printk (KERN_INFO "EOP - %s\n",result->eop ? "Yes":"No");
#endif /* IDETAPE_DEBUG_LOG */
if (result->bpu) {
- printk ("ide-tape: Block location is unknown to the tape\n");
- printk ("Aborting request\n");
- tape->block_address_valid=0;
+ printk (KERN_INFO "ide-tape: Block location is unknown to the tape\n");
+ clear_bit (IDETAPE_ADDRESS_VALID, &tape->flags);
idetape_end_request (0,HWGROUP (drive));
- }
- else {
+ } else {
#if IDETAPE_DEBUG_LOG
- printk ("Block Location - %lu\n",idetape_swap_long (result->first_block));
+ printk (KERN_INFO "Block Location - %lu\n", ntohl (result->first_block));
#endif /* IDETAPE_DEBUG_LOG */
- tape->block_address=idetape_swap_long (result->first_block);
- tape->block_address_valid=1;
+ tape->partition = result->partition;
+ tape->block_address = ntohl (result->first_block);
+ set_bit (IDETAPE_ADDRESS_VALID, &tape->flags);
idetape_end_request (1,HWGROUP (drive));
}
- }
- else {
- printk ("Aborting request\n");
+ } else
idetape_end_request (0,HWGROUP (drive));
- }
- return;
-}
-
-/*
- * Our special ide-tape ioctl's.
- *
- * Currently there aren't any significant ioctl's.
- * mtio.h compatible commands should be issued to the character device
- * interface.
- */
-
-int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- idetape_packet_command_t pc;
-
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: Reached idetape_blkdev_ioctl\n");
-#endif /* IDETAPE_DEBUG_LOG */
- switch (cmd) {
- default:
- return -EIO;
- }
}
-/*
- * Functions which handle requests.
- */
-
-/*
- * idetape_end_request is used to end a request.
- */
-
-void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
-
+static void idetape_create_read_position_cmd (idetape_pc_t *pc)
{
- ide_drive_t *drive = hwgroup->drive;
- struct request *rq = hwgroup->rq;
- idetape_tape_t *tape = &(drive->tape);
- unsigned int major = HWIF(drive)->major;
- struct blk_dev_struct *bdev = &blk_dev[major];
- int error;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_end_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- bdev->current_request=rq; /* Since we may have taken it out */
-
- if (!rq->errors) /* In case rq->errors is already set, */
- rq->errors=!uptodate; /* we won't change it. */
- error=rq->errors;
-
- if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */
-
- if (rq->cmd == IDETAPE_READ_REQUEST) {
-#if IDETAPE_DEBUG_BUGS
- if (tape->active_stage == NULL)
- printk ("ide-tape: bug: active_stage is NULL in idetape_end_request\n");
- else
-#endif /* IDETAPE_DEBUG_BUGS */
- idetape_copy_buffer_to_stage (tape->active_stage,tape->data_buffer);
- }
-
- tape->active_stage=NULL;
- tape->active_data_request=NULL;
-
- if (rq->cmd == IDETAPE_WRITE_REQUEST) {
- if (rq->errors)
- tape->error_in_pipeline_stage=rq->errors;
- idetape_remove_stage_head (drive);
- }
-
- if (tape->next_stage == NULL) {
- if (!error)
- idetape_increase_max_pipeline_stages (drive);
- ide_end_drive_cmd (drive, 0, 0);
- return;
- }
-
- idetape_active_next_stage (drive);
-
- /*
- * Insert the next request into the request queue.
- *
- * The choice of using ide_next or ide_end is now left
- * to the user.
- */
-
-#if IDETAPE_LOW_TAPE_PRIORITY
- (void) ide_do_drive_cmd (drive,tape->active_data_request,ide_end);
-#else
- (void) ide_do_drive_cmd (drive,tape->active_data_request,ide_next);
-#endif /* IDETAPE_LOW_TAPE_PRIORITY */
- }
- ide_end_drive_cmd (drive, 0, 0);
+ idetape_init_pc (pc);
+ pc->c[0] = IDETAPE_READ_POSITION_CMD;
+ pc->request_transfer = 20;
+ pc->callback = &idetape_read_position_callback;
}
/*
* idetape_do_request is our request handling function.
*/
-
-void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
-
+static void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_packet_command_t *pc;
- unsigned int major = HWIF(drive)->major;
- struct blk_dev_struct *bdev = &blk_dev[major];
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t *pc;
+ struct blk_dev_struct *bdev = &blk_dev[HWIF(drive)->major];
+ struct request *postponed_rq = tape->postponed_rq;
idetape_status_reg_t status;
#if IDETAPE_DEBUG_LOG
- printk ("Current request:\n");
- printk ("rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
- printk ("sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
+ printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
+ printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
#endif /* IDETAPE_DEBUG_LOG */
- if (!IDETAPE_REQUEST_CMD (rq->cmd)) {
-
+ if (!IDETAPE_RQ_CMD (rq->cmd)) {
/*
* We do not support buffer cache originated requests.
*/
-
- printk ("ide-tape: Unsupported command in request queue\n");
- printk ("ide-tape: The block device interface should not be used for data transfers.\n");
- printk ("ide-tape: Use the character device interfaces\n");
- printk ("ide-tape: /dev/ht0 and /dev/nht0 instead.\n");
- printk ("ide-tape: (Run linux/scripts/MAKEDEV.ide to create them)\n");
- printk ("ide-tape: Aborting request.\n");
-
+ printk (KERN_NOTICE "ide-tape: %s: Unsupported command in request queue\n", drive->name);
ide_end_request (0,HWGROUP (drive)); /* Let the common code handle it */
return;
}
@@ -2980,131 +2278,81 @@
*
* The potential fragmentation inefficiency was pointed to me
* by Mark Lord.
+ *
+ * Uhuh.. the following "fix" is actually not entirely correct.
+ * Some day we should probably move to a per device request
+ * queue, rather than per interface.
*/
-
if (rq->next != NULL && rq->rq_dev != rq->next->rq_dev)
bdev->current_request=rq->next;
- /* Retry a failed packet command */
-
+ /*
+ * Retry a failed packet command
+ */
if (tape->failed_pc != NULL && tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- idetape_issue_packet_command (drive,tape->failed_pc,&idetape_pc_intr);
+ idetape_issue_packet_command (drive, tape->failed_pc);
return;
}
-
- /* Check if we have a postponed request */
-
- if (tape->postponed_rq != NULL) {
#if IDETAPE_DEBUG_BUGS
- if (tape->postponed_rq->rq_status != RQ_ACTIVE || rq != tape->postponed_rq) {
- printk ("ide-tape: ide-tape.c bug - Two DSC requests were queued\n");
+ if (postponed_rq != NULL)
+ if (postponed_rq->rq_status != RQ_ACTIVE || rq != postponed_rq) {
+ printk (KERN_ERR "ide-tape: ide-tape.c bug - Two DSC requests were queued\n");
idetape_end_request (0,HWGROUP (drive));
return;
}
#endif /* IDETAPE_DEBUG_BUGS */
- if (rq->cmd == IDETAPE_PACKET_COMMAND_REQUEST_TYPE1) {
-
- /* Media access command */
-
- tape->postponed_rq = NULL;
- idetape_media_access_finished (drive);
- return;
- }
-
- /*
- * Read / Write command - DSC polling was done before the
- * actual command - Continue normally so that the command
- * will be performed below.
- */
-
- tape->postponed_rq = NULL;
- }
- status.all=IN_BYTE (IDETAPE_STATUS_REG);
+ tape->postponed_rq = NULL;
/*
- * After a software reset, the status register is locked. We
- * will ignore the DSC value for our very first packet command,
- * which will restore DSC operation.
+ * If the tape is still busy, postpone our request and service
+ * the other device meanwhile.
*/
-
- if (tape->reset_issued) {
- status.b.dsc=1;
- tape->reset_issued=0;
+ status.all = GET_STAT();
+ if (!clear_bit (IDETAPE_IGNORE_DSC, &tape->flags) && !status.b.dsc) {
+ if (postponed_rq == NULL) {
+ tape->dsc_polling_start = jiffies;
+ tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
+ tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
+ } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) {
+ printk (KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name);
+ if (rq->cmd == IDETAPE_PC_RQ)
+ idetape_media_access_finished (drive);
+ else
+ ide_do_reset (drive);
+ return;
+ } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD)
+ tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
+ idetape_postpone_request (drive);
+ return;
}
-
switch (rq->cmd) {
- case IDETAPE_READ_REQUEST:
- if (!status.b.dsc) { /* Tape buffer not ready to accept r/w command */
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: DSC != 1 - Postponing read request\n");
-#endif /* IDETAPE_DEBUG_LOG */
- tape->dsc_polling_frequency=tape->best_dsc_rw_frequency;
- idetape_postpone_request (drive); /* Allow ide.c to process requests from */
- return;
- }
-
+ case IDETAPE_READ_RQ:
pc=idetape_next_pc_storage (drive);
-
- idetape_create_read_cmd (pc,rq->current_nr_sectors);
-
- pc->buffer=rq->buffer;
- pc->buffer_size=rq->current_nr_sectors*tape->tape_block_size;
- pc->current_position=rq->buffer;
- pc->request_transfer=rq->current_nr_sectors*tape->tape_block_size;
-
- idetape_issue_packet_command (drive,pc,&idetape_pc_intr);
- return;
-
- case IDETAPE_WRITE_REQUEST:
- if (!status.b.dsc) { /* Tape buffer not ready to accept r/w command */
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: DSC != 1 - Postponing write request\n");
-#endif /* IDETAPE_DEBUG_LOG */
- tape->dsc_polling_frequency=tape->best_dsc_rw_frequency;
- idetape_postpone_request (drive); /* Allow ide.c to process requests from */
- return;
- }
-
+ idetape_create_read_cmd (tape, pc, rq->current_nr_sectors, rq->bh);
+ break;
+ case IDETAPE_WRITE_RQ:
pc=idetape_next_pc_storage (drive);
-
- idetape_create_write_cmd (pc,rq->current_nr_sectors);
-
- pc->buffer=rq->buffer;
- pc->buffer_size=rq->current_nr_sectors*tape->tape_block_size;
- pc->current_position=rq->buffer;
- pc->request_transfer=rq->current_nr_sectors*tape->tape_block_size;
-
- idetape_issue_packet_command (drive,pc,&idetape_pc_intr);
+ idetape_create_write_cmd (tape, pc, rq->current_nr_sectors, rq->bh);
+ break;
+ case IDETAPE_ABORTED_WRITE_RQ:
+ rq->cmd = IDETAPE_WRITE_RQ;
+ rq->errors = IDETAPE_ERROR_EOD;
+ idetape_end_request (1, HWGROUP(drive));
return;
-
- case IDETAPE_PACKET_COMMAND_REQUEST_TYPE1:
- case IDETAPE_PACKET_COMMAND_REQUEST_TYPE2:
-/*
- * This should be unnecessary (postponing of a general packet command),
- * but I have occasionally missed DSC on a media access command otherwise.
- * ??? Still have to figure it out ...
- */
- if (!status.b.dsc) { /* Tape buffers are still not ready */
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: DSC != 1 - Postponing packet command request\n");
-#endif /* IDETAPE_DEBUG_LOG */
- rq->cmd=IDETAPE_PACKET_COMMAND_REQUEST_TYPE2; /* Note that we are waiting for DSC *before* we */
- /* even issued the command */
- tape->dsc_polling_frequency=IDETAPE_DSC_READ_WRITE_FALLBACK_FREQUENCY;
- idetape_postpone_request (drive); /* Allow ide.c to process requests from */
+ case IDETAPE_PC_RQ:
+ if (postponed_rq != NULL) {
+ idetape_media_access_finished (drive);
return;
}
- rq->cmd=IDETAPE_PACKET_COMMAND_REQUEST_TYPE1;
- pc=(idetape_packet_command_t *) rq->buffer;
- idetape_issue_packet_command (drive,pc,&idetape_pc_intr);
- return;
-#if IDETAPE_DEBUG_BUGS
+ pc=(idetape_pc_t *) rq->buffer;
+ break;
default:
- printk ("ide-tape: bug in IDETAPE_REQUEST_CMD macro\n");
+ printk (KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n");
idetape_end_request (0,HWGROUP (drive));
-#endif /* IDETAPE_DEBUG_BUGS */
- }
+ return;
+ }
+ idetape_issue_packet_command (drive, pc);
}
/*
@@ -3127,72 +2375,34 @@
* the request to the request list without waiting for it to be serviced !
* In that case, we usually use idetape_queue_pc_head.
*/
-
-int idetape_queue_pc_tail (ide_drive_t *drive,idetape_packet_command_t *pc)
+static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
{
struct request rq;
ide_init_drive_cmd (&rq);
rq.buffer = (char *) pc;
- rq.cmd = IDETAPE_PACKET_COMMAND_REQUEST_TYPE1;
+ rq.cmd = IDETAPE_PC_RQ;
return ide_do_drive_cmd (drive, &rq, ide_wait);
}
/*
- * idetape_queue_pc_head generates a new packet command request in front
- * of the request queue, before the current request, so that it will be
- * processed immediately, on the next pass through the driver.
- *
- * idetape_queue_pc_head is called from the request handling part of
- * the driver (the "bottom" part). Safe storage for the request should
- * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
- * before calling idetape_queue_pc_head.
- *
- * Memory for those requests is pre-allocated at initialization time, and
- * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
- * space for the maximum possible number of inter-dependent packet commands.
- *
- * The higher level of the driver - The ioctl handler and the character
- * device handling functions should queue request to the lower level part
- * and wait for their completion using idetape_queue_pc_tail or
- * idetape_queue_rw_tail.
- */
-
-void idetape_queue_pc_head (ide_drive_t *drive,idetape_packet_command_t *pc,struct request *rq)
-
-{
- unsigned int major = HWIF(drive)->major;
- struct blk_dev_struct *bdev = &blk_dev[major];
-
- bdev->current_request=HWGROUP (drive)->rq; /* Since we may have taken it out */
-
- ide_init_drive_cmd (rq);
- rq->buffer = (char *) pc;
- rq->cmd = IDETAPE_PACKET_COMMAND_REQUEST_TYPE1;
- (void) ide_do_drive_cmd (drive, rq, ide_preempt);
-}
-
-/*
* idetape_wait_for_request installs a semaphore in a pending request
* and sleeps until it is serviced.
*
* The caller should ensure that the request will not be serviced
* before we install the semaphore (usually by disabling interrupts).
*/
-
-void idetape_wait_for_request (struct request *rq)
-
+static void idetape_wait_for_request (struct request *rq)
{
struct semaphore sem = MUTEX_LOCKED;
#if IDETAPE_DEBUG_BUGS
- if (rq == NULL || !IDETAPE_REQUEST_CMD (rq->cmd)) {
- printk ("ide-tape: bug: Trying to sleep on non-valid request\n");
- return;
+ if (rq == NULL || !IDETAPE_RQ_CMD (rq->cmd)) {
+ printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
+ return;
}
#endif /* IDETAPE_DEBUG_BUGS */
-
- rq->sem=&sem;
+ rq->sem = &sem;
down (&sem);
}
@@ -3200,93 +2410,93 @@
* idetape_queue_rw_tail generates a read/write request for the block
* device interface and wait for it to be serviced.
*/
-
-int idetape_queue_rw_tail (ide_drive_t *drive,int cmd,int blocks,char *buffer)
-
+static int idetape_queue_rw_tail (ide_drive_t *drive, int cmd, int blocks, struct buffer_head *bh)
{
- idetape_tape_t *tape = &(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
struct request rq;
#if IDETAPE_DEBUG_LOG
- printk ("idetape_queue_rw_tail: cmd=%d\n",cmd);
+ printk (KERN_INFO "idetape_queue_rw_tail: cmd=%d\n",cmd);
#endif /* IDETAPE_DEBUG_LOG */
#if IDETAPE_DEBUG_BUGS
- if (tape->active_data_request != NULL) {
- printk ("ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
+ if (idetape_pipeline_active (tape)) {
+ printk (KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
return (0);
}
#endif /* IDETAPE_DEBUG_BUGS */
ide_init_drive_cmd (&rq);
- rq.buffer = buffer;
+ rq.bh = bh;
rq.cmd = cmd;
rq.sector = tape->block_address;
rq.nr_sectors = rq.current_nr_sectors = blocks;
(void) ide_do_drive_cmd (drive, &rq, ide_wait);
- return (tape->tape_block_size*(blocks-rq.current_nr_sectors));
+ idetape_init_merge_stage (tape);
+ if (rq.errors == IDETAPE_ERROR_GENERAL)
+ return -EIO;
+ return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
}
/*
- * idetape_add_chrdev_read_request handles character device read requests
- * when operating in the pipelined operation mode.
+ * idetape_add_chrdev_read_request is called from idetape_chrdev_read
+ * to service a character device read request and add read-ahead
+ * requests to our pipeline.
*/
-
-int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks,char *buffer)
-
+static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
{
- idetape_tape_t *tape = &(drive->tape);
- idetape_pipeline_stage_t *new_stage;
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *new_stage;
unsigned long flags;
struct request rq,*rq_ptr;
int bytes_read;
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_add_chrdev_read_request\n");
+ printk (KERN_INFO "Reached idetape_add_chrdev_read_request\n");
#endif /* IDETAPE_DEBUG_LOG */
ide_init_drive_cmd (&rq);
- rq.cmd = IDETAPE_READ_REQUEST;
+ rq.cmd = IDETAPE_READ_RQ;
rq.sector = tape->block_address;
rq.nr_sectors = rq.current_nr_sectors = blocks;
- if (tape->active_data_request != NULL || tape->current_number_of_stages <= tape->max_number_of_stages / 4) {
- new_stage=idetape_kmalloc_stage (drive);
+ if (idetape_pipeline_active (tape) || tape->nr_stages <= tape->max_stages / 4) {
+ new_stage=idetape_kmalloc_stage (tape);
while (new_stage != NULL) {
new_stage->rq=rq;
- save_flags (flags);cli ();
idetape_add_stage_tail (drive,new_stage);
- restore_flags (flags);
- new_stage=idetape_kmalloc_stage (drive);
+ new_stage=idetape_kmalloc_stage (tape);
}
- if (tape->active_data_request == NULL)
+ if (!idetape_pipeline_active (tape))
idetape_insert_pipeline_into_queue (drive);
}
-
if (tape->first_stage == NULL) {
-
/*
* Linux is short on memory. Revert to non-pipelined
* operation mode for this request.
*/
-
- return (idetape_queue_rw_tail (drive,IDETAPE_READ_REQUEST,blocks,buffer));
- }
-
- save_flags (flags);cli ();
- if (tape->active_data_request == &(tape->first_stage->rq))
+ return (idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bh));
+ }
+ save_flags (flags);
+ cli ();
+ if (tape->active_stage == tape->first_stage)
idetape_wait_for_request (tape->active_data_request);
restore_flags (flags);
- rq_ptr=&(tape->first_stage->rq);
- bytes_read=tape->tape_block_size*(rq_ptr->nr_sectors-rq_ptr->current_nr_sectors);
- rq_ptr->nr_sectors=rq_ptr->current_nr_sectors=0;
- idetape_copy_buffer_from_stage (tape->first_stage,buffer);
- if (rq_ptr->errors != IDETAPE_RQ_ERROR_FILEMARK)
+ rq_ptr = &tape->first_stage->rq;
+ bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
+ rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
+
+ idetape_switch_buffers (tape, tape->first_stage);
+
+ if (rq_ptr->errors != IDETAPE_ERROR_FILEMARK) {
+ clear_bit (IDETAPE_FILEMARK, &tape->flags);
idetape_remove_stage_head (drive);
+ } else
+ set_bit (IDETAPE_FILEMARK, &tape->flags);
#if IDETAPE_DEBUG_BUGS
if (bytes_read > blocks*tape->tape_block_size) {
- printk ("ide-tape: bug: trying to return more bytes than requested\n");
+ printk (KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
bytes_read=blocks*tape->tape_block_size;
}
#endif /* IDETAPE_DEBUG_BUGS */
@@ -3304,60 +2514,47 @@
* 3. If we still can't allocate a stage, fallback to
* non-pipelined operation mode for this request.
*/
-
-int idetape_add_chrdev_write_request (ide_drive_t *drive,int blocks,char *buffer)
-
+static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
{
- idetape_tape_t *tape = &(drive->tape);
- idetape_pipeline_stage_t *new_stage;
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *new_stage;
unsigned long flags;
struct request *rq;
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_add_chrdev_write_request\n");
+ printk (KERN_INFO "Reached idetape_add_chrdev_write_request\n");
#endif /* IDETAPE_DEBUG_LOG */
-
-
- new_stage=idetape_kmalloc_stage (drive);
- /*
- * If we don't have a new stage, wait for more and more requests
- * to finish, and try to allocate after each one.
- *
+ /*
+ * Attempt to allocate a new stage.
* Pay special attention to possible race conditions.
*/
-
- while (new_stage == NULL) {
- save_flags (flags);cli ();
- if (tape->active_data_request != NULL) {
+ while ((new_stage = idetape_kmalloc_stage (tape)) == NULL) {
+ save_flags (flags);
+ cli ();
+ if (idetape_pipeline_active (tape)) {
idetape_wait_for_request (tape->active_data_request);
restore_flags (flags);
- new_stage=idetape_kmalloc_stage (drive);
- }
- else {
+ } else {
+ restore_flags (flags);
+ idetape_insert_pipeline_into_queue (drive);
+ if (idetape_pipeline_active (tape))
+ continue;
/*
* Linux is short on memory. Fallback to
* non-pipelined operation mode for this request.
*/
-
- restore_flags (flags);
- return (idetape_queue_rw_tail (drive,IDETAPE_WRITE_REQUEST,blocks,buffer));
+ return idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
}
}
-
- rq=&(new_stage->rq);
-
+ rq = &new_stage->rq;
ide_init_drive_cmd (rq);
- rq->cmd = IDETAPE_WRITE_REQUEST;
+ rq->cmd = IDETAPE_WRITE_RQ;
rq->sector = tape->block_address; /* Doesn't actually matter - We always assume sequential access */
- rq->nr_sectors = blocks;
- rq->current_nr_sectors = blocks;
+ rq->nr_sectors = rq->current_nr_sectors = blocks;
- idetape_copy_buffer_to_stage (new_stage,buffer);
-
- save_flags (flags);cli ();
+ idetape_switch_buffers (tape, new_stage);
idetape_add_stage_tail (drive,new_stage);
- restore_flags (flags);
/*
* Check if we are currently servicing requests in the bottom
@@ -3367,111 +2564,127 @@
* starting to service requests, so that we will be able to
* keep up with the higher speeds of the tape.
*/
+ if (!idetape_pipeline_active (tape) && tape->nr_stages >= (3 * tape->max_stages) / 4)
+ idetape_insert_pipeline_into_queue (drive);
- if (tape->active_data_request == NULL && tape->current_number_of_stages >= (3 * tape->max_number_of_stages) / 4)
- idetape_insert_pipeline_into_queue (drive);
-
- if (tape->error_in_pipeline_stage) { /* Return a deferred error */
- tape->error_in_pipeline_stage=0;
- return (-EIO);
- }
-
- return (blocks);
+ if (clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags)) /* Return a deferred error */
+ return -EIO;
+ return blocks;
}
-void idetape_discard_read_pipeline (ide_drive_t *drive)
-
+static void idetape_discard_read_pipeline (ide_drive_t *drive)
{
- idetape_tape_t *tape = &(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
unsigned long flags;
#if IDETAPE_DEBUG_BUGS
if (tape->chrdev_direction != idetape_direction_read) {
- printk ("ide-tape: bug: Trying to discard read pipeline, but we are not reading.\n");
+ printk (KERN_ERR "ide-tape: bug: Trying to discard read pipeline, but we are not reading.\n");
return;
}
#endif /* IDETAPE_DEBUG_BUGS */
-
- tape->merge_buffer_size=tape->merge_buffer_offset=0;
- tape->chrdev_direction=idetape_direction_none;
+ tape->merge_stage_size = 0;
+ if (tape->merge_stage != NULL) {
+ __idetape_kfree_stage (tape->merge_stage);
+ tape->merge_stage = NULL;
+ }
+ tape->chrdev_direction = idetape_direction_none;
if (tape->first_stage == NULL)
return;
- save_flags (flags);cli ();
- tape->next_stage=NULL;
- if (tape->active_data_request != NULL)
+ save_flags (flags);
+ cli ();
+ tape->next_stage = NULL;
+ if (idetape_pipeline_active (tape))
idetape_wait_for_request (tape->active_data_request);
restore_flags (flags);
while (tape->first_stage != NULL)
idetape_remove_stage_head (drive);
-
-#if IDETAPE_PIPELINE
- tape->max_number_of_stages=IDETAPE_MIN_PIPELINE_STAGES;
-#else
- tape->max_number_of_stages=0;
-#endif /* IDETAPE_PIPELINE */
+ tape->nr_pending_stages = 0;
+ tape->max_stages = IDETAPE_MIN_PIPELINE_STAGES;
}
/*
* idetape_wait_for_pipeline will wait until all pending pipeline
* requests are serviced. Typically called on device close.
*/
-
-void idetape_wait_for_pipeline (ide_drive_t *drive)
-
+static void idetape_wait_for_pipeline (ide_drive_t *drive)
{
- idetape_tape_t *tape = &(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
unsigned long flags;
- if (tape->active_data_request == NULL)
- idetape_insert_pipeline_into_queue (drive);
-
- save_flags (flags);cli ();
- if (tape->active_data_request == NULL) {
- restore_flags (flags);
- return;
- }
-
- if (tape->last_stage != NULL)
- idetape_wait_for_request (&(tape->last_stage->rq));
+ if (!idetape_pipeline_active (tape))
+ idetape_insert_pipeline_into_queue (drive);
- else if (tape->active_data_request != NULL)
- idetape_wait_for_request (tape->active_data_request);
+ save_flags (flags);
+ cli ();
+ if (!idetape_pipeline_active (tape))
+ goto abort;
+#if IDETAPE_DEBUG_BUGS
+ if (tape->last_stage == NULL)
+ printk ("ide-tape: tape->last_stage == NULL\n");
+ else
+#endif /* IDETAPE_DEBUG_BUGS */
+ idetape_wait_for_request (&tape->last_stage->rq);
+abort:
restore_flags (flags);
}
-void idetape_empty_write_pipeline (ide_drive_t *drive)
+static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct buffer_head *bh;
+ int count, blocks;
+
+ while (bcount) {
+ bh = tape->merge_stage->bh;
+ count = IDETAPE_MIN (tape->stage_size, bcount);
+ bcount -= count;
+ blocks = count / tape->tape_block_size;
+ while (count) {
+ bh->b_count = IDETAPE_MIN (count, bh->b_size);
+ memset (bh->b_data, 0, bh->b_count);
+ count -= bh->b_count;
+ bh = bh->b_reqnext;
+ }
+ idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
+ }
+}
+static void idetape_empty_write_pipeline (ide_drive_t *drive)
{
- idetape_tape_t *tape = &(drive->tape);
- int blocks;
+ idetape_tape_t *tape = drive->driver_data;
+ int blocks, i;
#if IDETAPE_DEBUG_BUGS
if (tape->chrdev_direction != idetape_direction_write) {
- printk ("ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
+ printk (KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
return;
}
- if (tape->merge_buffer_size > tape->data_buffer_size) {
- printk ("ide-tape: bug: merge_buffer too big\n");
- tape->merge_buffer_size = tape->data_buffer_size;
+ if (tape->merge_stage_size > tape->stage_size) {
+ printk (KERN_ERR "ide-tape: bug: merge_buffer too big\n");
+ tape->merge_stage_size = tape->stage_size;
}
#endif /* IDETAPE_DEBUG_BUGS */
-
- if (tape->merge_buffer_size) {
- blocks=tape->merge_buffer_size/tape->tape_block_size;
- if (tape->merge_buffer_size % tape->tape_block_size) {
+ if (tape->merge_stage_size) {
+ blocks=tape->merge_stage_size/tape->tape_block_size;
+ if (tape->merge_stage_size % tape->tape_block_size) {
blocks++;
- memset (tape->merge_buffer+tape->merge_buffer_size,0,tape->data_buffer_size-tape->merge_buffer_size);
+ i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
+ memset (tape->merge_stage->bh->b_data + tape->merge_stage->bh->b_count, 0, i);
+ tape->merge_stage->bh->b_count += i;
}
- (void) idetape_add_chrdev_write_request (drive,blocks,tape->merge_buffer);
- tape->merge_buffer_size=0;
+ (void) idetape_add_chrdev_write_request (drive, blocks);
+ tape->merge_stage_size = 0;
}
-
idetape_wait_for_pipeline (drive);
-
- tape->error_in_pipeline_stage=0;
+ if (tape->merge_stage != NULL) {
+ __idetape_kfree_stage (tape->merge_stage);
+ tape->merge_stage = NULL;
+ }
+ clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
tape->chrdev_direction=idetape_direction_none;
/*
@@ -3480,185 +2693,241 @@
* as some systems are constantly on, and the system load
* can be totally different on the next backup).
*/
+ tape->max_stages = IDETAPE_MIN_PIPELINE_STAGES;
+#if IDETAPE_DEBUG_BUGS
+ if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->nr_stages != 0) {
+ printk (KERN_ERR "ide-tape: ide-tape pipeline bug\n");
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+}
+
+static int idetape_pipeline_size (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_stage_t *stage;
+ struct request *rq;
+ int size = 0;
-#if IDETAPE_PIPELINE
- tape->max_number_of_stages=IDETAPE_MIN_PIPELINE_STAGES;
-#else
- tape->max_number_of_stages=0;
-#endif /* IDETAPE_PIPELINE */
-#if IDETAPE_DEBUG_BUGS
- if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->current_number_of_stages != 0) {
- printk ("ide-tape: ide-tape pipeline bug\n");
+ idetape_wait_for_pipeline (drive);
+ stage = tape->first_stage;
+ while (stage != NULL) {
+ rq = &stage->rq;
+ size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
+ if (rq->errors == IDETAPE_ERROR_FILEMARK)
+ size += tape->tape_block_size;
+ stage = stage->next;
}
-#endif /* IDETAPE_DEBUG_BUGS */
+ size += tape->merge_stage_size;
+ return size;
}
/*
- * idetape_zero_packet_command just zeros a packet command and
- * sets the number of retries to 0, as we haven't retried it yet.
+ * idetape_position_tape positions the tape to the requested block
+ * using the LOCATE packet command. A READ POSITION command is then
+ * issued to check where we are positioned.
+ *
+ * Like all higher level operations, we queue the commands at the tail
+ * of the request queue and wait for their completion.
+ *
*/
-
-void idetape_zero_packet_command (idetape_packet_command_t *pc)
+static int idetape_position_tape (ide_drive_t *drive, unsigned int block, byte partition)
+{
+ int retval;
+ idetape_pc_t pc;
+
+ idetape_create_locate_cmd (&pc, block, partition);
+ retval=idetape_queue_pc_tail (drive,&pc);
+ if (retval) return (retval);
+
+ idetape_create_read_position_cmd (&pc);
+ return (idetape_queue_pc_tail (drive,&pc));
+}
+/*
+ * Rewinds the tape to the Beginning Of the current Partition (BOP).
+ *
+ * We currently support only one partition.
+ */
+static int idetape_rewind_tape (ide_drive_t *drive)
{
- int i;
+ int retval;
+ idetape_pc_t pc;
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Reached idetape_rewind_tape\n");
+#endif /* IDETAPE_DEBUG_LOG */
- for (i=0;i<12;i++)
- pc->c[i]=0;
- pc->retries=0;
- pc->abort=0;
- pc->dma_recommended=0;
- pc->dma_error=0;
+ idetape_create_rewind_cmd (&pc);
+ retval=idetape_queue_pc_tail (drive,&pc);
+ if (retval) return (retval);
+
+ idetape_create_read_position_cmd (&pc);
+ return (idetape_queue_pc_tail (drive,&pc));
+}
+
+static int idetape_flush_tape_buffers (ide_drive_t *drive)
+{
+ idetape_pc_t pc;
+
+ idetape_create_write_filemark_cmd (&pc,0);
+ return (idetape_queue_pc_tail (drive,&pc));
}
/*
- * idetape_swap_shorts converts a 16 bit number from little endian
- * to big endian format.
+ * Our special ide-tape ioctl's.
+ *
+ * Currently there aren't any ioctl's.
+ * mtio.h compatible commands should be issued to the character device
+ * interface.
*/
-
-unsigned short idetape_swap_short (unsigned short temp)
-
+static int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
{
- union convert {
- unsigned all :16;
- struct {
- unsigned b1 :8;
- unsigned b2 :8;
- } b;
- } original,converted;
-
- original.all=temp;
- converted.b.b1=original.b.b2;
- converted.b.b2=original.b.b1;
- return (converted.all);
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_config_t config;
+
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
+#endif /* IDETAPE_DEBUG_LOG */
+ switch (cmd) {
+ case 0x0340:
+ if (copy_from_user ((char *) &config, (char *) arg, sizeof (idetape_config_t)))
+ return -EFAULT;
+ tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
+ tape->max_stages = config.nr_stages;
+ break;
+ case 0x0350:
+ config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
+ config.nr_stages = tape->max_stages;
+ if (copy_to_user ((char *) arg, (char *) &config, sizeof (idetape_config_t)))
+ return -EFAULT;
+ break;
+ default:
+ return -EIO;
+ }
+ return 0;
}
/*
- * idetape_swap_long converts from little endian to big endian format.
+ * The block device interface should not be used for data transfers.
+ * However, we still allow opening it so that we can issue general
+ * ide driver configuration ioctl's, such as the interrupt unmask feature.
*/
-
-unsigned long idetape_swap_long (unsigned long temp)
-
+static int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
- union convert {
- unsigned all :32;
- struct {
- unsigned b1 :8;
- unsigned b2 :8;
- unsigned b3 :8;
- unsigned b4 :8;
- } b;
- } original,converted;
-
- original.all=temp;
- converted.b.b1=original.b.b4;
- converted.b.b2=original.b.b3;
- converted.b.b3=original.b.b2;
- converted.b.b4=original.b.b1;
- return (converted.all);
+ MOD_INC_USE_COUNT;
+ return 0;
}
+static void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+ MOD_DEC_USE_COUNT;
+}
/*
- * idetape_next_pc_storage returns a pointer to a place in which we can
- * safely store a packet command, even though we intend to leave the
- * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
- * commands is allocated at initialization time.
+ * idetape_pre_reset is called before an ATAPI/ATA software reset.
*/
-
-idetape_packet_command_t *idetape_next_pc_storage (ide_drive_t *drive)
-
+static void idetape_pre_reset (ide_drive_t *drive)
{
- idetape_tape_t *tape;
-
- tape=&(drive->tape);
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: pc_stack_index=%d\n",tape->pc_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
- if (tape->pc_stack_index==IDETAPE_PC_STACK)
- tape->pc_stack_index=0;
- return (&(tape->pc_stack [tape->pc_stack_index++]));
+ idetape_tape_t *tape = drive->driver_data;
+ if (tape != NULL)
+ set_bit (IDETAPE_IGNORE_DSC, &tape->flags);
}
/*
- * idetape_next_rq_storage is used along with idetape_next_pc_storage.
- * Since we queue packet commands in the request queue, we need to
- * allocate a request, along with the allocation of a packet command.
+ * Character device interface functions
*/
-
-/**************************************************************
- * *
- * This should get fixed to use kmalloc(GFP_ATOMIC, ..) *
- * followed later on by kfree(). -ml *
- * *
- **************************************************************/
-
-struct request *idetape_next_rq_storage (ide_drive_t *drive)
-
+static ide_drive_t *get_drive_ptr (kdev_t i_rdev)
{
- idetape_tape_t *tape;
+ unsigned int i = MINOR(i_rdev) & ~0x80;
- tape=&(drive->tape);
-
-#if IDETAPE_DEBUG_LOG
- printk ("ide-tape: rq_stack_index=%d\n",tape->rq_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
- if (tape->rq_stack_index==IDETAPE_PC_STACK)
- tape->rq_stack_index=0;
- return (&(tape->rq_stack [tape->rq_stack_index++]));
+ if (i >= MAX_HWIFS * MAX_DRIVES)
+ return NULL;
+ return (idetape_chrdevs[i].drive);
}
/*
- * Block device interface functions
+ * idetape_space_over_filemarks is now a bit more complicated than just
+ * passing the command to the tape since we may have crossed some
+ * filemarks during our pipelined read-ahead mode.
*
- * The block device interface should not be used for data transfers.
- * However, we still allow opening it so that we can issue general
- * ide driver configuration ioctl's, such as the interrupt unmask feature.
+ * As a minor side effect, the pipeline enables us to support MTFSFM when
+ * the filemark is in our internal pipeline even if the tape doesn't
+ * support spacing over filemarks in the reverse direction.
*/
-
-int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
-
+static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
{
- idetape_tape_t *tape=&(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t pc;
unsigned long flags;
-
- save_flags (flags);cli ();
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_blkdev_open\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->busy) {
- restore_flags (flags); /* Allowing access only through one */
- return (-EBUSY); /* one file descriptor */
- }
-
- tape->busy=1;
- restore_flags (flags);
-
- return (0);
-}
+ int retval,count=0;
-void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
+ if (tape->chrdev_direction == idetape_direction_read) {
-{
- idetape_tape_t *tape=&(drive->tape);
- unsigned long flags;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_blkdev_release\n");
-#endif /* IDETAPE_DEBUG_LOG */
+ /*
+ * We have a read-ahead buffer. Scan it for crossed
+ * filemarks.
+ */
+ tape->merge_stage_size = 0;
+ clear_bit (IDETAPE_FILEMARK, &tape->flags);
+ while (tape->first_stage != NULL) {
+ /*
+ * Wait until the first read-ahead request
+ * is serviced.
+ */
+ save_flags (flags);
+ cli ();
+ if (tape->active_stage == tape->first_stage)
+ idetape_wait_for_request (tape->active_data_request);
+ restore_flags (flags);
- save_flags (flags);cli ();
- tape->busy=0;
- restore_flags (flags);
+ if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
+ count++;
+ if (count == mt_count) {
+ switch (mt_op) {
+ case MTFSF:
+ idetape_remove_stage_head (drive);
+ case MTFSFM:
+ return (0);
+ default:
+ break;
+ }
+ }
+ idetape_remove_stage_head (drive);
+ }
+ idetape_discard_read_pipeline (drive);
+ }
- return;
+ /*
+ * The filemark was not found in our internal pipeline.
+ * Now we can issue the space command.
+ */
+ switch (mt_op) {
+ case MTFSF:
+ idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
+ return (idetape_queue_pc_tail (drive,&pc));
+ case MTFSFM:
+ if (!tape->capabilities.sprev)
+ return (-EIO);
+ retval = idetape_space_over_filemarks (drive, MTFSF, mt_count-count);
+ if (retval) return (retval);
+ return (idetape_space_over_filemarks (drive, MTBSF, 1));
+ case MTBSF:
+ if (!tape->capabilities.sprev)
+ return (-EIO);
+ idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK);
+ return (idetape_queue_pc_tail (drive,&pc));
+ case MTBSFM:
+ if (!tape->capabilities.sprev)
+ return (-EIO);
+ retval = idetape_space_over_filemarks (drive, MTBSF, mt_count+count);
+ if (retval) return (retval);
+ return (idetape_space_over_filemarks (drive, MTFSF, 1));
+ default:
+ printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
+ return (-EIO);
+ }
}
-/*
- * Character device interface functions
- */
/*
* Our character device read / write functions.
@@ -3667,10 +2936,6 @@
* an integral number of the "continuous transfer limit", which is
* a parameter of the specific tape (26 KB on my particular tape).
*
- * For best results use an integral number of the tape's parameter
- * (which is displayed in the driver installation stage and is returned
- * by the MTIOCGET ioctl).
- *
* As of version 1.3 of the driver, the character device provides an
* abstract continuous view of the media - any mix of block sizes (even 1
* byte) on the same backup/restore procedure is supported. The driver
@@ -3679,226 +2944,150 @@
* size will only result in a (slightly) increased driver overhead, but
* will no longer hit performance.
*/
-
-int idetape_chrdev_read (struct inode *inode, struct file *file, char *buf, int count)
-
+static long idetape_chrdev_read (struct inode *inode, struct file *file, char *buf, unsigned long count)
{
- ide_drive_t *drive=idetape_chrdev.drive;
- idetape_tape_t *tape=&(drive->tape);
- char *buf_ptr=buf;
- int bytes_read,temp,actually_read=0;
+ ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
+ idetape_tape_t *tape = drive->driver_data;
+ int bytes_read,temp,actually_read=0, original_count = count;
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_chrdev_read\n");
+ printk (KERN_INFO "Reached idetape_chrdev_read\n");
#endif /* IDETAPE_DEBUG_LOG */
-
+
if (tape->chrdev_direction != idetape_direction_read) { /* Initialize read operation */
if (tape->chrdev_direction == idetape_direction_write) {
idetape_empty_write_pipeline (drive);
idetape_flush_tape_buffers (drive);
}
-
+#if IDETAPE_DEBUG_BUGS
+ if (tape->merge_stage || tape->merge_stage_size) {
+ printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
+ tape->merge_stage_size = 0;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ if ((tape->merge_stage = __idetape_kmalloc_stage (tape)) == NULL)
+ return -ENOMEM;
+ tape->chrdev_direction = idetape_direction_read;
+
/*
* Issue a read 0 command to ensure that DSC handshake
* is switched from completion mode to buffer available
* mode.
*/
-
- bytes_read=idetape_queue_rw_tail (drive,IDETAPE_READ_REQUEST,0,tape->merge_buffer);
- if (bytes_read < 0)
- return (bytes_read);
-
- tape->chrdev_direction=idetape_direction_read;
+ bytes_read = idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bh);
+ if (bytes_read < 0) {
+ kfree (tape->merge_stage);
+ tape->merge_stage = NULL;
+ tape->chrdev_direction = idetape_direction_none;
+ return bytes_read;
+ }
+ if (test_bit (IDETAPE_DETECT_BS, &tape->flags))
+ if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0)
+ tape->user_bs_factor = count / tape->tape_block_size;
}
-
if (count==0)
return (0);
-
- if (tape->merge_buffer_size) {
-#if IDETAPE_DEBUG_BUGS
- if (tape->merge_buffer_offset+tape->merge_buffer_size > tape->data_buffer_size) {
- printk ("ide-tape: bug: merge buffer too big\n");
- tape->merge_buffer_offset=0;tape->merge_buffer_size=tape->data_buffer_size-1;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- actually_read=IDETAPE_MIN (tape->merge_buffer_size,count);
- copy_to_user (buf_ptr,tape->merge_buffer+tape->merge_buffer_offset,actually_read);
- buf_ptr+=actually_read;tape->merge_buffer_size-=actually_read;
- count-=actually_read;tape->merge_buffer_offset+=actually_read;
+ if (tape->merge_stage_size) {
+ actually_read=IDETAPE_MIN (tape->merge_stage_size,count);
+ idetape_copy_stage_to_user (tape, buf, tape->merge_stage, actually_read);
+ buf += actually_read; tape->merge_stage_size -= actually_read; count-=actually_read;
}
-
- while (count >= tape->data_buffer_size) {
- bytes_read=idetape_add_chrdev_read_request (drive,tape->capabilities.ctl,tape->merge_buffer);
+ while (count >= tape->stage_size) {
+ bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl);
if (bytes_read <= 0)
- return (actually_read);
- copy_to_user (buf_ptr,tape->merge_buffer,bytes_read);
- buf_ptr+=bytes_read;count-=bytes_read;actually_read+=bytes_read;
+ goto finish;
+ idetape_copy_stage_to_user (tape, buf, tape->merge_stage, bytes_read);
+ buf += bytes_read; count -= bytes_read; actually_read += bytes_read;
}
-
if (count) {
- bytes_read=idetape_add_chrdev_read_request (drive,tape->capabilities.ctl,tape->merge_buffer);
+ bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl);
if (bytes_read <= 0)
- return (actually_read);
+ goto finish;
temp=IDETAPE_MIN (count,bytes_read);
- copy_to_user (buf_ptr,tape->merge_buffer,temp);
+ idetape_copy_stage_to_user (tape, buf, tape->merge_stage, temp);
actually_read+=temp;
- tape->merge_buffer_offset=temp;
- tape->merge_buffer_size=bytes_read-temp;
+ tape->merge_stage_size=bytes_read-temp;
}
+finish:
+ if (actually_read < original_count && test_bit (IDETAPE_FILEMARK, &tape->flags))
+ idetape_space_over_filemarks (drive, MTFSF, 1);
return (actually_read);
}
-int idetape_chrdev_write (struct inode *inode, struct file *file, const char *buf, int count)
-
+static long idetape_chrdev_write (struct inode *inode, struct file *file, const char *buf, unsigned long count)
{
- ide_drive_t *drive=idetape_chrdev.drive;
- idetape_tape_t *tape=&(drive->tape);
- const char *buf_ptr=buf;
+ ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
+ idetape_tape_t *tape = drive->driver_data;
int retval,actually_written=0;
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_chrdev_write\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */
- if (tape->chrdev_direction == idetape_direction_read)
- idetape_discard_read_pipeline (drive);
-
- /*
- * Issue a write 0 command to ensure that DSC handshake
- * is switched from completion mode to buffer available
- * mode.
- */
-
- retval=idetape_queue_rw_tail (drive,IDETAPE_WRITE_REQUEST,0,tape->merge_buffer);
- if (retval < 0)
- return (retval);
-
- tape->chrdev_direction=idetape_direction_write;
- }
-
- if (count==0)
- return (0);
-
- if (tape->merge_buffer_size) {
-#if IDETAPE_DEBUG_BUGS
- if (tape->merge_buffer_size >= tape->data_buffer_size) {
- printk ("ide-tape: bug: merge buffer too big\n");
- tape->merge_buffer_size=0;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- actually_written=IDETAPE_MIN (tape->data_buffer_size-tape->merge_buffer_size,count);
- copy_from_user (tape->merge_buffer+tape->merge_buffer_size,buf_ptr,actually_written);
- buf_ptr+=actually_written;tape->merge_buffer_size+=actually_written;count-=actually_written;
-
- if (tape->merge_buffer_size == tape->data_buffer_size) {
- tape->merge_buffer_size=0;
- retval=idetape_add_chrdev_write_request (drive,tape->capabilities.ctl,tape->merge_buffer);
- if (retval <= 0)
- return (retval);
- }
- }
-
- while (count >= tape->data_buffer_size) {
- copy_from_user (tape->merge_buffer,buf_ptr,tape->data_buffer_size);
- buf_ptr+=tape->data_buffer_size;count-=tape->data_buffer_size;
- retval=idetape_add_chrdev_write_request (drive,tape->capabilities.ctl,tape->merge_buffer);
- actually_written+=tape->data_buffer_size;
- if (retval <= 0)
- return (retval);
- }
-
- if (count) {
- actually_written+=count;
- copy_from_user (tape->merge_buffer,buf_ptr,count);
- tape->merge_buffer_size+=count;
- }
- return (actually_written);
-}
-
-/*
- * Our character device ioctls.
- *
- * General mtio.h magnetic io commands are supported here, and not in
- * the corresponding block interface.
- *
- * The following ioctls are supported:
- *
- * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
- *
- * MTIOCGET - The mt_dsreg field in the returned mtget structure
- * will be set to (recommended block size <<
- * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK, which
- * is currently equal to the size itself.
- * The other mtget fields are not supported.
- *
- * Note that we do not actually return the tape's
- * block size. Rather, we provide the recommended
- * number of bytes which should be used as a "user
- * block size" with the character device read/write
- * functions to maximize throughput.
- *
- * MTIOCPOS - The current tape "position" is returned.
- * (A unique number which can be used with the MTSEEK
- * operation to return to this position in some
- * future time, provided this place was not overwritten
- * meanwhile).
- *
- * Our own ide-tape ioctls are supported on both interfaces.
- */
-
-int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-
-{
- ide_drive_t *drive=idetape_chrdev.drive;
- idetape_tape_t *tape=&(drive->tape);
- idetape_packet_command_t pc;
- struct mtop mtop;
- struct mtget mtget;
- struct mtpos mtpos;
- int retval;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_chrdev_ioctl, cmd=%u\n",cmd);
+ printk (KERN_INFO "Reached idetape_chrdev_write\n");
#endif /* IDETAPE_DEBUG_LOG */
- if (tape->chrdev_direction == idetape_direction_write) {
- idetape_empty_write_pipeline (drive);
- idetape_flush_tape_buffers (drive);
- }
+ if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */
+ if (tape->chrdev_direction == idetape_direction_read)
+ idetape_discard_read_pipeline (drive);
+#if IDETAPE_DEBUG_BUGS
+ if (tape->merge_stage || tape->merge_stage_size) {
+ printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
+ tape->merge_stage_size = 0;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ if ((tape->merge_stage = __idetape_kmalloc_stage (tape)) == NULL)
+ return -ENOMEM;
+ tape->chrdev_direction = idetape_direction_write;
+ idetape_init_merge_stage (tape);
- if (tape->chrdev_direction == idetape_direction_read && cmd != MTIOCTOP)
- idetape_discard_read_pipeline (drive);
-
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
+ /*
+ * Issue a write 0 command to ensure that DSC handshake
+ * is switched from completion mode to buffer available
+ * mode.
+ */
+ retval = idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bh);
+ if (retval < 0) {
+ kfree (tape->merge_stage);
+ tape->merge_stage = NULL;
+ tape->chrdev_direction = idetape_direction_none;
+ return retval;
+ }
+ if (test_bit (IDETAPE_DETECT_BS, &tape->flags))
+ if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0)
+ tape->user_bs_factor = count / tape->tape_block_size;
+ }
+ if (count==0)
+ return (0);
+ if (tape->merge_stage_size) {
+#if IDETAPE_DEBUG_BUGS
+ if (tape->merge_stage_size >= tape->stage_size) {
+ printk (KERN_ERR "ide-tape: bug: merge buffer too big\n");
+ tape->merge_stage_size=0;
+ }
+#endif /* IDETAPE_DEBUG_BUGS */
+ actually_written=IDETAPE_MIN (tape->stage_size-tape->merge_stage_size,count);
+ idetape_copy_stage_from_user (tape, tape->merge_stage, buf, actually_written);
+ buf+=actually_written;tape->merge_stage_size+=actually_written;count-=actually_written;
- switch (cmd) {
- case MTIOCTOP:
- retval=verify_area (VERIFY_READ,(char *) arg,sizeof (struct mtop));
- if (retval) return (retval);
- copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop));
- return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count));
- case MTIOCGET:
- mtget.mt_dsreg=(tape->data_buffer_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
- retval=verify_area (VERIFY_WRITE,(char *) arg,sizeof (struct mtget));
- if (retval) return (retval);
- copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget));
- return (0);
- case MTIOCPOS:
- idetape_create_read_position_cmd (&pc);
- retval=idetape_queue_pc_tail (drive,&pc);
- if (retval) return (retval);
- mtpos.mt_blkno=tape->block_address;
- retval=verify_area (VERIFY_WRITE,(char *) arg,sizeof (struct mtpos));
- if (retval) return (retval);
- copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos));
- return (0);
- default:
- return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg));
+ if (tape->merge_stage_size == tape->stage_size) {
+ tape->merge_stage_size = 0;
+ retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl);
+ if (retval <= 0)
+ return (retval);
+ }
+ }
+ while (count >= tape->stage_size) {
+ idetape_copy_stage_from_user (tape, tape->merge_stage, buf, tape->stage_size);
+ buf+=tape->stage_size;count-=tape->stage_size;
+ retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl);
+ actually_written+=tape->stage_size;
+ if (retval <= 0)
+ return (retval);
+ }
+ if (count) {
+ actually_written+=count;
+ idetape_copy_stage_from_user (tape, tape->merge_stage, buf, count);
+ tape->merge_stage_size+=count;
}
+ return (actually_written);
}
/*
@@ -3918,7 +3107,6 @@
*
* MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
*
- *
* Note:
*
* MTBSF and MTBSFM are not supported when the tape doesn't
@@ -3932,8 +3120,10 @@
*
* MTREW - Rewinds tape.
*
+ * MTLOAD - Loads the tape.
+ *
* MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
- * prevents further access until the media is replaced.
+ * MTUNLOAD prevents further access until the media is replaced.
*
* MTNOP - Flushes tape buffers.
*
@@ -3944,35 +3134,33 @@
*
* MTERASE - Erases tape.
*
- * MTSEEK - Positions the tape in a specific block number, which
- * was previously received using the MTIOCPOS ioctl,
- * assuming this place was not overwritten meanwhile.
+ * MTSETBLK - Sets the user block size to mt_count bytes. If
+ * mt_count is 0, we will attempt to autodetect
+ * the block size.
+ *
+ * MTSEEK - Positions the tape in a specific block number, where
+ * each block is assumed to contain which user_block_size
+ * bytes.
+ *
+ * MTSETPART - Switches to another tape partition.
*
* The following commands are currently not supported:
*
- * MTFSR, MTBSR, MTFSS, MTBSS, MTWSM, MTSETBLK, MTSETDENSITY,
+ * MTFSR, MTBSR, MTFSS, MTBSS, MTWSM, MTSETDENSITY,
* MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
*/
-
-int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
-
+static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_packet_command_t pc;
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t pc;
int i,retval;
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
-
#if IDETAPE_DEBUG_LOG
- printk ("Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count);
+ printk (KERN_INFO "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count);
#endif /* IDETAPE_DEBUG_LOG */
-
/*
* Commands which need our pipelined read-ahead stages.
*/
-
switch (mt_op) {
case MTFSF:
case MTFSFM:
@@ -3988,7 +3176,6 @@
/*
* Empty the pipeline.
*/
-
if (tape->chrdev_direction == idetape_direction_read)
idetape_discard_read_pipeline (drive);
@@ -4002,6 +3189,10 @@
return (0);
case MTREW:
return (idetape_rewind_tape (drive));
+ case MTLOAD:
+ idetape_create_load_unload_cmd (&pc, IDETAPE_LU_LOAD_MASK);
+ return (idetape_queue_pc_tail (drive,&pc));
+ case MTUNLOAD:
case MTOFFL:
idetape_create_load_unload_cmd (&pc,!IDETAPE_LU_LOAD_MASK);
return (idetape_queue_pc_tail (drive,&pc));
@@ -4014,607 +3205,582 @@
idetape_create_space_cmd (&pc,0,IDETAPE_SPACE_TO_EOD);
return (idetape_queue_pc_tail (drive,&pc));
case MTERASE:
- retval=idetape_rewind_tape (drive);
- if (retval) return (retval);
+ (void) idetape_rewind_tape (drive);
idetape_create_erase_cmd (&pc);
return (idetape_queue_pc_tail (drive,&pc));
+ case MTSETBLK:
+ if (mt_count) {
+ if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
+ return -EIO;
+ tape->user_bs_factor = mt_count / tape->tape_block_size;
+ clear_bit (IDETAPE_DETECT_BS, &tape->flags);
+ } else
+ set_bit (IDETAPE_DETECT_BS, &tape->flags);
+ return 0;
case MTSEEK:
- return (idetape_position_tape (drive,mt_count));
+ return (idetape_position_tape (drive, mt_count * tape->user_bs_factor, tape->partition));
+ case MTSETPART:
+ return (idetape_position_tape (drive, 0, mt_count));
default:
- printk ("ide-tape: MTIO operation %d not supported\n",mt_op);
+ printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
return (-EIO);
}
}
/*
- * idetape_space_over_filemarks is now a bit more complicated than just
- * passing the command to the tape since we may have crossed some
- * filemarks during our pipelined read-ahead mode.
+ * Our character device ioctls.
*
- * As a minor side effect, the pipeline enables us to support MTFSFM when
- * the filemark is in our internal pipeline even if the tape doesn't
- * support spacing over filemarks in the reverse direction.
- */
-
-int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
-
-{
- idetape_tape_t *tape=&(drive->tape);
- idetape_packet_command_t pc;
- unsigned long flags;
- int retval,count=0,errors;
-
- if (tape->chrdev_direction == idetape_direction_read) {
-
- /*
- * We have a read-ahead buffer. Scan it for crossed
- * filemarks.
- */
-
- tape->merge_buffer_size=tape->merge_buffer_offset=0;
- while (tape->first_stage != NULL) {
-
- /*
- * Wait until the first read-ahead request
- * is serviced.
- */
-
- save_flags (flags);cli ();
- if (tape->active_data_request == &(tape->first_stage->rq))
- idetape_wait_for_request (tape->active_data_request);
- restore_flags (flags);
-
- errors=tape->first_stage->rq.errors;
- if (errors == IDETAPE_RQ_ERROR_FILEMARK)
- count++;
-
- if (count == mt_count) {
- switch (mt_op) {
- case MTFSF:
- idetape_remove_stage_head (drive);
- case MTFSFM:
- return (0);
- }
- }
- idetape_remove_stage_head (drive);
- }
- idetape_discard_read_pipeline (drive);
- }
-
- /*
- * The filemark was not found in our internal pipeline.
- * Now we can issue the space command.
- */
-
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
-
- switch (mt_op) {
- case MTFSF:
- idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTFSFM:
- if (!tape->capabilities.sprev)
- return (-EIO);
- retval=idetape_mtioctop (drive,MTFSF,mt_count-count);
- if (retval) return (retval);
- return (idetape_mtioctop (drive,MTBSF,1));
- case MTBSF:
- if (!tape->capabilities.sprev)
- return (-EIO);
- idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTBSFM:
- if (!tape->capabilities.sprev)
- return (-EIO);
- retval=idetape_mtioctop (drive,MTBSF,mt_count+count);
- if (retval) return (retval);
- return (idetape_mtioctop (drive,MTFSF,1));
- default:
- printk ("ide-tape: MTIO operation %d not supported\n",mt_op);
- return (-EIO);
- }
-}
-
-/*
- * Our character device open function.
- */
-
-int idetape_chrdev_open (struct inode *inode, struct file *filp)
-
-{
- ide_drive_t *drive=idetape_chrdev.drive;
- idetape_tape_t *tape=&(drive->tape);
- unsigned long flags;
- unsigned int minor=MINOR (inode->i_rdev),allocation_length;
-
- save_flags (flags);cli ();
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_chrdev_open\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (minor!=0 && minor!=128) { /* Currently supporting only one */
- restore_flags (flags); /* tape drive */
- return (-ENXIO);
- }
-
- if (tape->busy) {
- restore_flags (flags); /* Allowing access only through one */
- return (-EBUSY); /* one file descriptor */
- }
-
- tape->busy=1;
- restore_flags (flags);
-
- allocation_length=tape->data_buffer_size;
- if (tape->data_buffer_size % IDETAPE_ALLOCATION_BLOCK)
- allocation_length+=IDETAPE_ALLOCATION_BLOCK;
-
-#if IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE
- if (tape->data_buffer == NULL)
- tape->data_buffer=kmalloc (allocation_length,GFP_KERNEL);
- if (tape->data_buffer == NULL)
- goto sorry;
- if (tape->merge_buffer == NULL)
- tape->merge_buffer=kmalloc (allocation_length,GFP_KERNEL);
- if (tape->merge_buffer == NULL) {
- kfree (tape->data_buffer);
- sorry:
- printk ("ide-tape: FATAL - Can not allocate continuous buffer of %d bytes\n",allocation_length);
- tape->busy=0;
- return (-EIO);
- }
-#endif /* IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE */
-
- if (!tape->block_address_valid) {
- if (idetape_rewind_tape (drive)) {
- printk ("ide-tape: Rewinding tape failed\n");
- tape->busy=0;
- return (-EIO);
- }
- }
-
- return (0);
-}
-
-/*
- * Our character device release function.
- */
-
-void idetape_chrdev_release (struct inode *inode, struct file *filp)
-
-{
- ide_drive_t *drive=idetape_chrdev.drive;
- idetape_tape_t *tape=&(drive->tape);
- unsigned int minor=MINOR (inode->i_rdev);
- idetape_packet_command_t pc;
- unsigned long flags;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_chrdev_release\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->chrdev_direction == idetape_direction_write) {
- idetape_empty_write_pipeline (drive);
- idetape_create_write_filemark_cmd (&pc,1); /* Write a filemark */
- if (idetape_queue_pc_tail (drive,&pc))
- printk ("ide-tape: Couldn't write a filemark\n");
- }
-
- if (tape->chrdev_direction == idetape_direction_read) {
- if (minor < 128)
- idetape_discard_read_pipeline (drive);
- else
- idetape_wait_for_pipeline (drive);
- }
-
- if (minor < 128)
- if (idetape_rewind_tape (drive))
- printk ("ide-tape: Rewinding tape failed\n");
-
-#if IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE
- kfree (tape->data_buffer);
- tape->data_buffer=NULL;
- if (!tape->merge_buffer_size) {
- kfree (tape->merge_buffer);
- tape->merge_buffer=NULL;
- }
-#endif /* IDETAPE_MINIMIZE_IDLE_MEMORY_USAGE */
-
- save_flags (flags);cli ();
- tape->busy=0;
- restore_flags (flags);
-
- return;
-}
-
-/*
- * idetape_position_tape positions the tape to the requested block
- * using the LOCATE packet command. A READ POSITION command is then
- * issued to check where we are positioned.
+ * General mtio.h magnetic io commands are supported here, and not in
+ * the corresponding block interface.
*
- * Like all higher level operations, we queue the commands at the tail
- * of the request queue and wait for their completion.
- *
- */
-
-int idetape_position_tape (ide_drive_t *drive,unsigned long block)
-
-{
- int retval;
- idetape_packet_command_t pc;
-
- idetape_create_locate_cmd (&pc,block,0);
- retval=idetape_queue_pc_tail (drive,&pc);
- if (retval!=0) return (retval);
-
- idetape_create_read_position_cmd (&pc);
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
- return (idetape_queue_pc_tail (drive,&pc));
-}
-
-/*
- * Rewinds the tape to the Beginning Of the current Partition (BOP).
+ * The following ioctls are supported:
*
- * We currently support only one partition.
- */
-
-int idetape_rewind_tape (ide_drive_t *drive)
-
-{
- int retval;
- idetape_packet_command_t pc;
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_rewind_tape\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- idetape_create_rewind_cmd (&pc);
- retval=idetape_queue_pc_tail (drive,&pc);
- if (retval) return (retval);
-
- idetape_create_read_position_cmd (&pc);
- pc.buffer=pc.temp_buffer;
- pc.buffer_size=IDETAPE_TEMP_BUFFER_SIZE;
- pc.current_position=pc.temp_buffer;
- return (idetape_queue_pc_tail (drive,&pc));
-}
-
-int idetape_flush_tape_buffers (ide_drive_t *drive)
-
-{
- idetape_packet_command_t pc;
-
- idetape_create_write_filemark_cmd (&pc,0);
- return (idetape_queue_pc_tail (drive,&pc));
-}
-
-/*
- * Pipeline related functions
- */
-
-/*
- * idetape_kmalloc_stage uses kmalloc to allocate a pipeline stage,
- * along with all the necessary small buffers which together make
- * a buffer of size tape->data_buffer_size or a bit more, in case
- * it is not a multiply of IDETAPE_ALLOCATION_BLOCK (it isn't ...).
+ * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
*
- * Returns a pointer to the new allocated stage, or NULL if we
- * can't (or don't want to, in case we already have too many stages)
- * allocate a stage.
+ * MTIOCGET - The mt_dsreg field in the returned mtget structure
+ * will be set to (user block size in bytes <<
+ * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
*
- * Pipeline stages are optional and are used to increase performance.
- * If we can't allocate them, we'll manage without them.
+ * The mt_blkno is set to the current user block number.
+ * The other mtget fields are not supported.
+ *
+ * MTIOCPOS - The current tape "block position" is returned. We
+ * assume that each block contains user_block_size
+ * bytes.
+ *
+ * Our own ide-tape ioctls are supported on both interfaces.
*/
-
-idetape_pipeline_stage_t *idetape_kmalloc_stage (ide_drive_t *drive)
-
+static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_pipeline_stage_t *new_stage;
- idetape_buffer_head_t *prev_bh,*bh;
- int buffers_num,i;
-
+ ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t pc;
+ struct mtop mtop;
+ struct mtget mtget;
+ struct mtpos mtpos;
+ int retval, block_offset = 0;
+
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_kmalloc_stage\n");
+ printk (KERN_INFO "Reached idetape_chrdev_ioctl, cmd=%u\n",cmd);
#endif /* IDETAPE_DEBUG_LOG */
- if (tape->current_number_of_stages>=tape->max_number_of_stages) {
- return (NULL);
+ if (tape->chrdev_direction == idetape_direction_write) {
+ idetape_empty_write_pipeline (drive);
+ idetape_flush_tape_buffers (drive);
}
-
- new_stage=(idetape_pipeline_stage_t *) kmalloc (sizeof (idetape_pipeline_stage_t),GFP_KERNEL);
- if (new_stage==NULL)
- return (NULL);
-
- new_stage->next=new_stage->prev=NULL;
-
- buffers_num=tape->data_buffer_size / IDETAPE_ALLOCATION_BLOCK;
- if (tape->data_buffer_size % IDETAPE_ALLOCATION_BLOCK)
- buffers_num++;
-
- prev_bh=new_stage->bh=(idetape_buffer_head_t *) kmalloc (sizeof (idetape_buffer_head_t),GFP_KERNEL);
- if (new_stage->bh==NULL) {
- idetape_kfree_stage (new_stage);
- return (NULL);
- }
- new_stage->bh->next=NULL;
-
- new_stage->bh->data=kmalloc (IDETAPE_ALLOCATION_BLOCK,GFP_KERNEL);
- if (new_stage->bh->data==NULL) {
- idetape_kfree_stage (new_stage);
- return (NULL);
+ if (cmd == MTIOCGET || cmd == MTIOCPOS) {
+ block_offset = idetape_pipeline_size (drive) / (tape->tape_block_size * tape->user_bs_factor);
+ idetape_create_read_position_cmd (&pc);
+ retval=idetape_queue_pc_tail (drive,&pc);
+ if (retval) return (retval);
}
-
- for (i=1;i<buffers_num;i++) {
- bh=(idetape_buffer_head_t *) kmalloc (sizeof (idetape_buffer_head_t),GFP_KERNEL);
- if (bh==NULL) {
- idetape_kfree_stage (new_stage);
- return (NULL);
- }
- bh->next=NULL;
- prev_bh->next=bh;
- bh->data=kmalloc (IDETAPE_ALLOCATION_BLOCK,GFP_KERNEL);
- if (bh->data == NULL) {
- idetape_kfree_stage (new_stage);
- return (NULL);
- }
- prev_bh=bh;
+ switch (cmd) {
+ case MTIOCTOP:
+ if (copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop)))
+ return -EFAULT;
+ return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count));
+ case MTIOCGET:
+ memset (&mtget, 0, sizeof (struct mtget));
+ mtget.mt_blkno = tape->block_address / tape->user_bs_factor - block_offset;
+ mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
+ if (copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget)))
+ return -EFAULT;
+ return 0;
+ case MTIOCPOS:
+ mtpos.mt_blkno = tape->block_address / tape->user_bs_factor - block_offset;
+ if (copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos)))
+ return -EFAULT;
+ return 0;
+ default:
+ if (tape->chrdev_direction == idetape_direction_read)
+ idetape_discard_read_pipeline (drive);
+ return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg));
}
- return (new_stage);
}
/*
- * idetape_kfree_stage calls kfree to completely free a stage, along with
- * its related buffers.
+ * Our character device open function.
*/
-
-void idetape_kfree_stage (idetape_pipeline_stage_t *stage)
-
+static int idetape_chrdev_open (struct inode *inode, struct file *filp)
{
- idetape_buffer_head_t *prev_bh,*bh;
-
- if (stage == NULL)
- return;
-
+ ide_drive_t *drive;
+ idetape_tape_t *tape;
+ idetape_pc_t pc;
+
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_kfree_stage\n");
+ printk (KERN_INFO "Reached idetape_chrdev_open\n");
#endif /* IDETAPE_DEBUG_LOG */
- bh=stage->bh;
-
- while (bh != NULL) {
- prev_bh=bh;
- if (bh->data != NULL)
- kfree (bh->data);
- bh=bh->next;
- kfree (prev_bh);
- }
-
- kfree (stage);
- return;
+ if ((drive = get_drive_ptr (inode->i_rdev)) == NULL)
+ return -ENXIO;
+ tape = drive->driver_data;
+
+ if (set_bit (IDETAPE_BUSY, &tape->flags))
+ return -EBUSY;
+ MOD_INC_USE_COUNT;
+ idetape_create_read_position_cmd (&pc);
+ (void) idetape_queue_pc_tail (drive,&pc);
+ if (!test_bit (IDETAPE_ADDRESS_VALID, &tape->flags))
+ (void) idetape_rewind_tape (drive);
+ MOD_DEC_USE_COUNT;
+
+ if (tape->chrdev_direction == idetape_direction_none)
+ MOD_INC_USE_COUNT;
+ return 0;
}
/*
- * idetape_copy_buffer_from_stage and idetape_copy_buffer_to_stage
- * copy data from/to the small buffers into/from a continuous buffer.
+ * Our character device release function.
*/
-
-void idetape_copy_buffer_from_stage (idetape_pipeline_stage_t *stage,char *buffer)
-
+static void idetape_chrdev_release (struct inode *inode, struct file *filp)
{
- idetape_buffer_head_t *bh;
- char *ptr;
-
+ ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
+ idetape_tape_t *tape = drive->driver_data;
+ unsigned int minor=MINOR (inode->i_rdev);
+ idetape_pc_t pc;
+
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_copy_buffer_from_stage\n");
+ printk (KERN_INFO "Reached idetape_chrdev_release\n");
#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (buffer == NULL) {
- printk ("ide-tape: bug: buffer is null in copy_buffer_from_stage\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- ptr=buffer;
- bh=stage->bh;
-
- while (bh != NULL) {
-#if IDETAPE_DEBUG_BUGS
- if (bh->data == NULL) {
- printk ("ide-tape: bug: bh->data is null\n");
- return;
+
+ if (tape->chrdev_direction == idetape_direction_write) {
+ idetape_empty_write_pipeline (drive);
+ tape->merge_stage = __idetape_kmalloc_stage (tape);
+ if (tape->merge_stage != NULL) {
+ idetape_pad_zeros (drive, tape->tape_block_size * (tape->user_bs_factor - 1));
+ __idetape_kfree_stage (tape->merge_stage);
+ tape->merge_stage = NULL;
}
-#endif /* IDETAPE_DEBUG_BUGS */
- memcpy (ptr,bh->data,IDETAPE_ALLOCATION_BLOCK);
- bh=bh->next;
- ptr=ptr+IDETAPE_ALLOCATION_BLOCK;
+ idetape_create_write_filemark_cmd (&pc,1); /* Write a filemark */
+ if (idetape_queue_pc_tail (drive,&pc))
+ printk (KERN_ERR "ide-tape: Couldn't write a filemark\n");
+ }
+ if (tape->chrdev_direction == idetape_direction_read) {
+ if (minor < 128)
+ idetape_discard_read_pipeline (drive);
+ else
+ idetape_wait_for_pipeline (drive);
}
- return;
+ if (tape->cache_stage != NULL) {
+ __idetape_kfree_stage (tape->cache_stage);
+ tape->cache_stage = NULL;
+ }
+ if (minor < 128)
+ (void) idetape_rewind_tape (drive);
+
+ clear_bit (IDETAPE_BUSY, &tape->flags);
+ if (tape->chrdev_direction == idetape_direction_none)
+ MOD_DEC_USE_COUNT;
}
/*
- * Here we copy a continuous data buffer to the various small buffers
- * in the pipeline stage.
+ * idetape_identify_device is called to check the contents of the
+ * ATAPI IDENTIFY command results. We return:
+ *
+ * 1 If the tape can be supported by us, based on the information
+ * we have so far.
+ *
+ * 0 If this tape driver is not currently supported by us.
*/
-
-void idetape_copy_buffer_to_stage (idetape_pipeline_stage_t *stage,char *buffer)
-
+static int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id)
{
- idetape_buffer_head_t *bh;
- char *ptr;
-
+ struct idetape_id_gcw gcw;
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_copy_buffer_to_stage\n");
+ unsigned short mask,i;
#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (buffer == NULL) {
- printk ("ide-tape: bug: buffer is null in copy_buffer_to_stage\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- ptr=buffer;
- bh=stage->bh;
-
- while (bh != NULL) {
-#if IDETAPE_DEBUG_BUGS
- if (bh->data == NULL) {
- printk ("ide-tape: bug: bh->data is null\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- memcpy (bh->data,ptr,IDETAPE_ALLOCATION_BLOCK);
- bh=bh->next;
- ptr=ptr+IDETAPE_ALLOCATION_BLOCK;
- }
- return;
-}
-
-/*
- * idetape_increase_max_pipeline_stages is a part of the feedback
- * loop which tries to find the optimum number of stages. In the
- * feedback loop, we are starting from a minimum maximum number of
- * stages, and if we sense that the pipeline is empty, we try to
- * increase it, until we reach the user compile time memory limit.
- */
-void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
+ *((unsigned short *) &gcw) = id->config;
-{
- idetape_tape_t *tape=&(drive->tape);
-
#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_increase_max_pipeline_stages\n");
-#endif /* IDETAPE_DEBUG_LOG */
+ printk (KERN_INFO "Dumping ATAPI Identify Device tape parameters\n");
+ printk (KERN_INFO "Protocol Type: ");
+ switch (gcw.protocol) {
+ case 0: case 1: printk (KERN_INFO "ATA\n");break;
+ case 2: printk (KERN_INFO "ATAPI\n");break;
+ case 3: printk (KERN_INFO "Reserved (Unknown to ide-tape)\n");break;
+ }
+ printk (KERN_INFO "Device Type: %x - ",gcw.device_type);
+ switch (gcw.device_type) {
+ case 0: printk (KERN_INFO "Direct-access Device\n");break;
+ case 1: printk (KERN_INFO "Streaming Tape Device\n");break;
+ case 2: case 3: case 4: printk (KERN_INFO "Reserved\n");break;
+ case 5: printk (KERN_INFO "CD-ROM Device\n");break;
+ case 6: printk (KERN_INFO "Reserved\n");
+ case 7: printk (KERN_INFO "Optical memory Device\n");break;
+ case 0x1f: printk (KERN_INFO "Unknown or no Device type\n");break;
+ default: printk (KERN_INFO "Reserved\n");
+ }
+ printk (KERN_INFO "Removable: %s",gcw.removable ? "Yes\n":"No\n");
+ printk (KERN_INFO "Command Packet DRQ Type: ");
+ switch (gcw.drq_type) {
+ case 0: printk (KERN_INFO "Microprocessor DRQ\n");break;
+ case 1: printk (KERN_INFO "Interrupt DRQ\n");break;
+ case 2: printk (KERN_INFO "Accelerated DRQ\n");break;
+ case 3: printk (KERN_INFO "Reserved\n");break;
+ }
+ printk (KERN_INFO "Command Packet Size: ");
+ switch (gcw.packet_size) {
+ case 0: printk (KERN_INFO "12 bytes\n");break;
+ case 1: printk (KERN_INFO "16 bytes\n");break;
+ default: printk (KERN_INFO "Reserved\n");break;
+ }
+ printk (KERN_INFO "Model: %s\n",id->model);
+ printk (KERN_INFO "Firmware Revision: %s\n",id->fw_rev);
+ printk (KERN_INFO "Serial Number: %s\n",id->serial_no);
+ printk (KERN_INFO "Write buffer size: %d bytes\n",id->buf_size*512);
+ printk (KERN_INFO "DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
+ printk (KERN_INFO "LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
+ printk (KERN_INFO "IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
+ printk (KERN_INFO "IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
+ printk (KERN_INFO "ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
+ printk (KERN_INFO "PIO Cycle Timing Category: %d\n",id->tPIO);
+ printk (KERN_INFO "DMA Cycle Timing Category: %d\n",id->tDMA);
+ printk (KERN_INFO "Single Word DMA supported modes: ");
+ for (i=0,mask=1;i<8;i++,mask=mask << 1) {
+ if (id->dma_1word & mask)
+ printk (KERN_INFO "%d ",i);
+ if (id->dma_1word & (mask << 8))
+ printk (KERN_INFO "(active) ");
+ }
+ printk (KERN_INFO "\n");
+ printk (KERN_INFO "Multi Word DMA supported modes: ");
+ for (i=0,mask=1;i<8;i++,mask=mask << 1) {
+ if (id->dma_mword & mask)
+ printk (KERN_INFO "%d ",i);
+ if (id->dma_mword & (mask << 8))
+ printk (KERN_INFO "(active) ");
+ }
+ printk (KERN_INFO "\n");
+ if (id->field_valid & 0x0002) {
+ printk (KERN_INFO "Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None");
+ printk (KERN_INFO "Minimum Multi-word DMA cycle per word: ");
+ if (id->eide_dma_min == 0)
+ printk (KERN_INFO "Not supported\n");
+ else
+ printk (KERN_INFO "%d ns\n",id->eide_dma_min);
- tape->max_number_of_stages+=IDETAPE_INCREASE_STAGES_RATE;
+ printk (KERN_INFO "Manufacturer\'s Recommended Multi-word cycle: ");
+ if (id->eide_dma_time == 0)
+ printk (KERN_INFO "Not supported\n");
+ else
+ printk (KERN_INFO "%d ns\n",id->eide_dma_time);
- if (tape->max_number_of_stages >= IDETAPE_MAX_PIPELINE_STAGES)
- tape->max_number_of_stages = IDETAPE_MAX_PIPELINE_STAGES;
+ printk (KERN_INFO "Minimum PIO cycle without IORDY: ");
+ if (id->eide_pio == 0)
+ printk (KERN_INFO "Not supported\n");
+ else
+ printk (KERN_INFO "%d ns\n",id->eide_pio);
-#if IDETAPE_DEBUG_LOG
- printk ("Maximum number of stages: %d\n",tape->max_number_of_stages);
+ printk (KERN_INFO "Minimum PIO cycle with IORDY: ");
+ if (id->eide_pio_iordy == 0)
+ printk (KERN_INFO "Not supported\n");
+ else
+ printk (KERN_INFO "%d ns\n",id->eide_pio_iordy);
+
+ } else
+ printk (KERN_INFO "According to the device, fields 64-70 are not valid.\n");
#endif /* IDETAPE_DEBUG_LOG */
- return;
+ /* Check that we can support this device */
+
+ if (gcw.protocol !=2 )
+ printk (KERN_ERR "ide-tape: Protocol is not ATAPI\n");
+ else if (gcw.device_type != 1)
+ printk (KERN_ERR "ide-tape: Device type is not set to tape\n");
+ else if (!gcw.removable)
+ printk (KERN_ERR "ide-tape: The removable flag is not set\n");
+ else if (gcw.drq_type != 2) {
+ printk (KERN_ERR "ide-tape: Sorry, DRQ types other than Accelerated DRQ\n");
+ printk (KERN_ERR "ide-tape: are still not supported by the driver\n");
+ } else if (gcw.packet_size != 0) {
+ printk (KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
+ if (gcw.packet_size == 1)
+ printk (KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
+ } else
+ return 1;
+ return 0;
}
/*
- * idetape_add_stage_tail adds a new stage at the end of the pipeline.
- *
- * Caller should disable interrupts, if necessary.
+ * idetape_get_mode_sense_results asks the tape about its various
+ * parameters. In particular, we will adjust our data transfer buffer
+ * size to the recommended value as returned by the tape.
*/
-
-void idetape_add_stage_tail (ide_drive_t *drive,idetape_pipeline_stage_t *stage)
-
+static void idetape_get_mode_sense_results (ide_drive_t *drive)
{
- idetape_tape_t *tape=&(drive->tape);
+ idetape_tape_t *tape = drive->driver_data;
+ idetape_pc_t pc;
+ idetape_mode_parameter_header_t *header;
+ idetape_capabilities_page_t *capabilities;
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_add_stage_tail\n");
+ idetape_create_mode_sense_cmd (&pc,IDETAPE_CAPABILITIES_PAGE);
+ if (idetape_queue_pc_tail (drive,&pc)) {
+ printk (KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
+ tape->tape_block_size = 512; tape->capabilities.ctl = 52;
+ tape->capabilities.speed = 450; tape->capabilities.buffer_size = 6 * 52;
+ return;
+ }
+ header = (idetape_mode_parameter_header_t *) pc.buffer;
+ capabilities = (idetape_capabilities_page_t *) (header + 1);
+
+ capabilities->max_speed = ntohs (capabilities->max_speed);
+ capabilities->ctl = ntohs (capabilities->ctl);
+ capabilities->speed = ntohs (capabilities->speed);
+ capabilities->buffer_size = ntohs (capabilities->buffer_size);
+
+ tape->capabilities = *capabilities; /* Save us a copy */
+ tape->tape_block_size = capabilities->blk512 ? 512:1024;
+#if IDETAPE_DEBUG_LOG
+ printk (KERN_INFO "Dumping the results of the MODE SENSE packet command\n");
+ printk (KERN_INFO "Mode Parameter Header:\n");
+ printk (KERN_INFO "Mode Data Length - %d\n",header->mode_data_length);
+ printk (KERN_INFO "Medium Type - %d\n",header->medium_type);
+ printk (KERN_INFO "Device Specific Parameter - %d\n",header->dsp);
+ printk (KERN_INFO "Block Descriptor Length - %d\n",header->bdl);
+
+ printk (KERN_INFO "Capabilities and Mechanical Status Page:\n");
+ printk (KERN_INFO "Page code - %d\n",capabilities->page_code);
+ printk (KERN_INFO "Page length - %d\n",capabilities->page_length);
+ printk (KERN_INFO "Read only - %s\n",capabilities->ro ? "Yes":"No");
+ printk (KERN_INFO "Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
+ printk (KERN_INFO "Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
+ printk (KERN_INFO "Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
+ printk (KERN_INFO "Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
+ printk (KERN_INFO "The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
+ printk (KERN_INFO "The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
+ printk (KERN_INFO "Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
+ printk (KERN_INFO "Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
+ printk (KERN_INFO "Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
+ printk (KERN_INFO "Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
+ printk (KERN_INFO "Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
+ printk (KERN_INFO "Restricted byte count for PIO transfers - %s\n",capabilities->slowb ? "Yes":"No");
+ printk (KERN_INFO "Maximum supported speed in KBps - %d\n",capabilities->max_speed);
+ printk (KERN_INFO "Continuous transfer limits in blocks - %d\n",capabilities->ctl);
+ printk (KERN_INFO "Current speed in KBps - %d\n",capabilities->speed);
+ printk (KERN_INFO "Buffer size - %d\n",capabilities->buffer_size*512);
#endif /* IDETAPE_DEBUG_LOG */
-
- stage->next=NULL;
- stage->prev=tape->last_stage;
- if (tape->last_stage != NULL)
- tape->last_stage->next=stage;
- else
- tape->first_stage=tape->next_stage=stage;
- tape->last_stage=stage;
- if (tape->next_stage == NULL)
- tape->next_stage=tape->last_stage;
- tape->current_number_of_stages++;
}
/*
- * idetape_remove_stage_head removes tape->first_stage from the pipeline.
+ * ide_setup is called to:
+ *
+ * 1. Initialize our various state variables.
+ * 2. Ask the tape for its capabilities.
+ * 3. Allocate a buffer which will be used for data
+ * transfer. The buffer size is chosen based on
+ * the recommendation which we received in step (2).
*
- * Again, caller should avoid race conditions.
+ * Note that at this point ide.c already assigned us an irq, so that
+ * we can queue requests here and wait for their completion.
*/
-
-void idetape_remove_stage_head (ide_drive_t *drive)
-
+static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_pipeline_stage_t *stage;
-
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_remove_stage_head\n");
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (tape->first_stage == NULL) {
- printk ("ide-tape: bug: tape->first_stage is NULL\n");
- return;
+ ide_hwif_t *hwif = HWIF(drive);
+ unsigned long t1, tmid, tn, t;
+
+ drive->driver_data = tape;
+ drive->ready_stat = 0; /* An ATAPI device ignores DRDY */
+ memset (tape, 0, sizeof (idetape_tape_t));
+ tape->drive = drive;
+ tape->minor = minor;
+ tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor;
+ tape->chrdev_direction = idetape_direction_none;
+ tape->pc = tape->pc_stack;
+ tape->max_stages = IDETAPE_MIN_PIPELINE_STAGES;
+
+ idetape_get_mode_sense_results (drive);
+
+ tape->user_bs_factor = 1;
+ tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
+ while (tape->stage_size > 0xffff) {
+ printk (KERN_NOTICE "ide-tape: decreasing stage size\n");
+ tape->capabilities.ctl /= 2;
+ tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
}
- if (tape->active_stage == tape->first_stage) {
- printk ("ide-tape: bug: Trying to free our active pipeline stage\n");
- return;
+ tape->pages_per_stage = tape->stage_size / PAGE_SIZE;
+ if (tape->stage_size % PAGE_SIZE) {
+ tape->pages_per_stage++;
+ tape->excess_bh_size = PAGE_SIZE - tape->stage_size % PAGE_SIZE;
}
-#endif /* IDETAPE_DEBUG_BUGS */
- stage=tape->first_stage;
- tape->first_stage=stage->next;
- idetape_kfree_stage (stage);
- tape->current_number_of_stages--;
- if (tape->first_stage == NULL) {
- tape->last_stage=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (tape->next_stage != NULL)
- printk ("ide-tape: bug: tape->next_stage != NULL\n");
- if (tape->current_number_of_stages)
- printk ("ide-tape: bug: current_number_of_stages should be 0 now\n");
-#endif /* IDETAPE_DEBUG_BUGS */
+
+ /*
+ * Select the "best" DSC read/write polling frequency.
+ * The following algorithm attempts to find a balance between
+ * good latency and good system throughput. It will be nice to
+ * have all this configurable in run time at some point.
+ */
+ t1 = (tape->stage_size * HZ) / (tape->capabilities.speed * 1000);
+ tmid = (tape->capabilities.buffer_size * 32 * HZ) / (tape->capabilities.speed * 125);
+ tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (tape->capabilities.speed * 1000);
+
+ if (tape->max_stages) {
+ if (drive->using_dma)
+ t = tmid;
+ else {
+ if (hwif->drives[drive->select.b.unit ^ 1].present || hwif->next != hwif)
+ t = (tn + tmid) / 2;
+ else
+ t = tn;
+ }
+ } else
+ t = t1;
+ t = IDETAPE_MIN (t, tmid);
+
+ /*
+ * Ensure that the number we got makes sense.
+ */
+ tape->best_dsc_rw_frequency = IDETAPE_MAX (IDETAPE_MIN (t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
+ if (tape->best_dsc_rw_frequency != t) {
+ printk (KERN_NOTICE "ide-tape: Although the recommended polling period is %lu jiffies\n", t);
+ printk (KERN_NOTICE "ide-tape: we will use %lu jiffies\n", tape->best_dsc_rw_frequency);
}
+ printk (KERN_INFO "ide-tape: %s <-> %s, %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n",
+ drive->name, tape->name, tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->stage_size,
+ tape->stage_size / 1024, tape->max_stages * tape->stage_size / 1024,
+ tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":"");
}
+static int idetape_cleanup (ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ int minor = tape->minor;
+ unsigned long flags;
+
+ save_flags (flags);
+ cli ();
+ if (test_bit (IDETAPE_BUSY, &tape->flags) || tape->first_stage != NULL || tape->merge_stage_size || drive->usage) {
+ restore_flags(flags);
+ return 1;
+ }
+ idetape_chrdevs[minor].drive = NULL;
+ restore_flags (flags);
+ DRIVER(drive)->busy = 0;
+ (void) ide_unregister_subdriver (drive);
+ drive->driver_data = NULL;
+ kfree (tape);
+ for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++)
+ if (idetape_chrdevs[minor].drive != NULL)
+ return 0;
+ unregister_chrdev (IDETAPE_MAJOR, "ht");
+ idetape_chrdev_present = 0;
+ return 0;
+}
+
+int idetape_init (void);
+
+static ide_module_t idetape_module = {
+ IDE_DRIVER_MODULE,
+ idetape_init,
+ NULL
+};
+
/*
- * idetape_insert_pipeline_into_queue is used to start servicing the
- * pipeline stages, starting from tape->next_stage.
+ * IDE subdriver functions, registered with ide.c
*/
-
-void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
+static ide_driver_t idetape_driver = {
+ ide_tape, /* media */
+ 1, /* busy */
+ 1, /* supports_dma */
+ idetape_cleanup, /* cleanup */
+ idetape_do_request, /* do_request */
+ idetape_end_request, /* end_request */
+ idetape_blkdev_ioctl, /* ioctl */
+ idetape_blkdev_open, /* open */
+ idetape_blkdev_release, /* release */
+ NULL, /* media_change */
+ idetape_pre_reset, /* pre_reset */
+ NULL, /* capacity */
+ NULL /* special */
+};
-{
- idetape_tape_t *tape=&(drive->tape);
+/*
+ * Our character device supporting functions, passed to register_chrdev.
+ */
+static struct file_operations idetape_fops = {
+ NULL, /* lseek - default */
+ idetape_chrdev_read, /* read */
+ idetape_chrdev_write, /* write */
+ NULL, /* readdir - bad */
+ NULL, /* select */
+ idetape_chrdev_ioctl, /* ioctl */
+ NULL, /* mmap */
+ idetape_chrdev_open, /* open */
+ idetape_chrdev_release, /* release */
+ NULL, /* fsync */
+ NULL, /* fasync */
+ NULL, /* check_media_change */
+ NULL /* revalidate */
+};
- if (tape->next_stage == NULL)
- return;
+/*
+ * idetape_init will register the driver for each tape.
+ */
+int idetape_init (void)
+{
+ ide_drive_t *drive;
+ idetape_tape_t *tape;
+ int minor, failed = 0, supported = 0;
- if (tape->active_data_request == NULL) {
- idetape_active_next_stage (drive);
- (void) (ide_do_drive_cmd (drive,tape->active_data_request,ide_end));
- return;
- }
+ MOD_INC_USE_COUNT;
+ if (!idetape_chrdev_present)
+ for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++ )
+ idetape_chrdevs[minor].drive = NULL;
+
+ if ((drive = ide_scan_devices (ide_tape, NULL, failed++)) == NULL) {
+ ide_register_module (&idetape_module);
+ MOD_DEC_USE_COUNT;
+ return 0;
+ }
+ if (!idetape_chrdev_present && register_chrdev (IDETAPE_MAJOR, "ht", &idetape_fops)) {
+ printk (KERN_ERR "ide-tape: Failed to register character device interface\n");
+ MOD_DEC_USE_COUNT;
+ return -EBUSY;
+ }
+ do {
+ if (!idetape_identify_device (drive, drive->id)) {
+ printk (KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
+ continue;
+ }
+ tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL);
+ if (tape == NULL) {
+ printk (KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
+ continue;
+ }
+ if (ide_register_subdriver (drive, &idetape_driver, IDE_SUBDRIVER_VERSION)) {
+ printk (KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name);
+ kfree (tape);
+ continue;
+ }
+ for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++);
+ idetape_setup (drive, tape, minor);
+ idetape_chrdevs[minor].drive = drive;
+ supported++; failed--;
+ } while ((drive = ide_scan_devices (ide_tape, NULL, failed++)) != NULL);
+ if (!idetape_chrdev_present && !supported) {
+ unregister_chrdev (IDETAPE_MAJOR, "ht");
+ } else
+ idetape_chrdev_present = 1;
+ ide_register_module (&idetape_module);
+ MOD_DEC_USE_COUNT;
+ return 0;
}
-/*
- * idetape_active_next_stage will declare the next stage as "active".
- */
-
-void idetape_active_next_stage (ide_drive_t *drive)
+#ifdef MODULE
+int init_module (void)
+{
+ return idetape_init ();
+}
+void cleanup_module (void)
{
- idetape_tape_t *tape=&(drive->tape);
- idetape_pipeline_stage_t *stage=tape->next_stage;
- struct request *rq=&(stage->rq);
+ ide_drive_t *drive;
+ int minor;
-#if IDETAPE_DEBUG_LOG
- printk ("Reached idetape_active_next_stage\n");
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (stage == NULL) {
- printk ("ide-tape: bug: Trying to activate a non existing stage\n");
- return;
+ for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) {
+ drive = idetape_chrdevs[minor].drive;
+ if (drive != NULL && idetape_cleanup (drive))
+ printk (KERN_ERR "ide-tape: %s: cleanup_module() called while still busy\n", drive->name);
}
-#endif /* IDETAPE_DEBUG_BUGS */
- if (rq->cmd == IDETAPE_WRITE_REQUEST)
- idetape_copy_buffer_from_stage (stage,tape->data_buffer);
-
- rq->buffer=tape->data_buffer;
- tape->active_data_request=rq;
- tape->active_stage=stage;
- tape->next_stage=stage->next;
+ ide_unregister_module(&idetape_module);
}
+#endif /* MODULE */
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