patch-2.4.21 linux-2.4.21/arch/ia64/sn/io/sn1/xbow.c
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- Lines: 1087
- Date:
2003-06-13 07:51:30.000000000 -0700
- Orig file:
linux-2.4.20/arch/ia64/sn/io/sn1/xbow.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.20/arch/ia64/sn/io/sn1/xbow.c linux-2.4.21/arch/ia64/sn/io/sn1/xbow.c
@@ -0,0 +1,1086 @@
+/* $Id: xbow.c,v 1.3 2002/11/21 17:51:57 jh Exp $
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1992-1997,2000-2002 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <asm/sn/sgi.h>
+#include <asm/sn/iograph.h>
+#include <asm/sn/invent.h>
+#include <asm/sn/hcl.h>
+#include <asm/sn/labelcl.h>
+#include <asm/sn/hack.h>
+#include <asm/sn/pci/bridge.h>
+#include <asm/sn/xtalk/xtalk_private.h>
+#include <asm/sn/simulator.h>
+
+/* #define DEBUG 1 */
+/* #define XBOW_DEBUG 1 */
+
+
+/*
+ * Files needed to get the device driver entry points
+ */
+
+#include <asm/sn/xtalk/xbow.h>
+#include <asm/sn/xtalk/xtalk.h>
+#include <asm/sn/xtalk/xswitch.h>
+#include <asm/sn/xtalk/xwidget.h>
+
+#include <asm/sn/prio.h>
+#include <asm/sn/hcl_util.h>
+
+
+#define NEW(ptr) (ptr = kmalloc(sizeof (*(ptr)), GFP_KERNEL))
+#define DEL(ptr) (kfree(ptr))
+
+int xbow_devflag = D_MP;
+
+/*
+ * This file supports the Xbow chip. Main functions: initializtion,
+ * error handling, and GBR.
+ */
+
+/*
+ * each vertex corresponding to an xbow chip
+ * has a "fastinfo" pointer pointing at one
+ * of these things.
+ */
+typedef struct xbow_soft_s *xbow_soft_t;
+
+struct xbow_soft_s {
+ devfs_handle_t conn; /* our connection point */
+ devfs_handle_t vhdl; /* xbow's private vertex */
+ devfs_handle_t busv; /* the xswitch vertex */
+ xbow_t *base; /* PIO pointer to crossbow chip */
+ char *name; /* hwgraph name */
+
+ xbow_perf_t xbow_perfcnt[XBOW_PERF_COUNTERS];
+ xbow_perf_link_t xbow_perflink[MAX_XBOW_PORTS];
+ xbow_link_status_t xbow_link_status[MAX_XBOW_PORTS];
+ spinlock_t xbow_perf_lock;
+ int link_monitor;
+ widget_cfg_t *wpio[MAX_XBOW_PORTS]; /* cached PIO pointer */
+
+ /* Bandwidth allocation state. Bandwidth values are for the
+ * destination port since contention happens there.
+ * Implicit mapping from xbow ports (8..f) -> (0..7) array indices.
+ */
+ spinlock_t xbow_bw_alloc_lock; /* bw allocation lock */
+ unsigned long long bw_hiwm[MAX_XBOW_PORTS]; /* hiwater mark values */
+ unsigned long long bw_cur_used[MAX_XBOW_PORTS]; /* bw used currently */
+};
+
+#define xbow_soft_set(v,i) hwgraph_fastinfo_set((v), (arbitrary_info_t)(i))
+#define xbow_soft_get(v) ((xbow_soft_t)hwgraph_fastinfo_get((v)))
+
+/*
+ * Function Table of Contents
+ */
+
+void xbow_mlreset(xbow_t *);
+void xbow_init(void);
+int xbow_attach(devfs_handle_t);
+
+int xbow_open(devfs_handle_t *, int, int, cred_t *);
+int xbow_close(devfs_handle_t, int, int, cred_t *);
+
+int xbow_map(devfs_handle_t, vhandl_t *, off_t, size_t, uint);
+int xbow_unmap(devfs_handle_t, vhandl_t *);
+int xbow_ioctl(devfs_handle_t, int, void *, int, struct cred *, int *);
+
+int xbow_widget_present(xbow_t *, int);
+static int xbow_link_alive(xbow_t *, int);
+devfs_handle_t xbow_widget_lookup(devfs_handle_t, int);
+
+void xbow_intr_preset(void *, int, xwidgetnum_t, iopaddr_t, xtalk_intr_vector_t);
+
+
+
+void xbow_update_perf_counters(devfs_handle_t);
+xbow_perf_link_t *xbow_get_perf_counters(devfs_handle_t);
+int xbow_enable_perf_counter(devfs_handle_t, int, int, int);
+xbow_link_status_t *xbow_get_llp_status(devfs_handle_t);
+void xbow_update_llp_status(devfs_handle_t);
+
+int xbow_disable_llp_monitor(devfs_handle_t);
+int xbow_enable_llp_monitor(devfs_handle_t);
+int xbow_prio_bw_alloc(devfs_handle_t, xwidgetnum_t, xwidgetnum_t,
+ unsigned long long, unsigned long long);
+
+xswitch_reset_link_f xbow_reset_link;
+
+void idbg_xbowregs(int64_t);
+
+xswitch_provider_t xbow_provider =
+{
+ xbow_reset_link,
+};
+
+/*
+ * xbow_mlreset: called at mlreset time if the
+ * platform specific code determines that there is
+ * a crossbow in a critical path that must be
+ * functional before the driver would normally get
+ * the device properly set up.
+ *
+ * what do we need to do, that the boot prom can
+ * not be counted on to have already done, that is
+ * generic across all platforms using crossbows?
+ */
+/*ARGSUSED */
+void
+xbow_mlreset(xbow_t * xbow)
+{
+}
+
+/*
+ * xbow_init: called with the rest of the device
+ * driver XXX_init routines. This platform *might*
+ * have a Crossbow chip, or even several, but it
+ * might have none. Register with the crosstalk
+ * generic provider so when we encounter the chip
+ * the right magic happens.
+ */
+void
+xbow_init(void)
+{
+
+#if DEBUG && ATTACH_DEBUG
+ printk("xbow_init\n");
+#endif
+
+ xwidget_driver_register(PXBOW_WIDGET_PART_NUM,
+ 0, /* XXBOW_WIDGET_MFGR_NUM, */
+ "xbow_",
+ CDL_PRI_HI); /* attach before friends */
+
+
+ xwidget_driver_register(XXBOW_WIDGET_PART_NUM,
+ 0, /* XXBOW_WIDGET_MFGR_NUM, */
+ "xbow_",
+ CDL_PRI_HI); /* attach before friends */
+
+ xwidget_driver_register(XBOW_WIDGET_PART_NUM,
+ XBOW_WIDGET_MFGR_NUM,
+ "xbow_",
+ CDL_PRI_HI); /* attach before friends */
+}
+
+#ifdef XBRIDGE_REGS_SIM
+/* xbow_set_simulated_regs: sets xbow regs as needed
+ * for powering through the boot
+ */
+void
+xbow_set_simulated_regs(xbow_t *xbow, int port)
+{
+ /*
+ * turn on link
+ */
+ xbow->xb_link(port).link_status = (1<<31);
+ /*
+ * and give it a live widget too
+ */
+ xbow->xb_link(port).link_aux_status = XB_AUX_STAT_PRESENT;
+ /*
+ * zero the link control reg
+ */
+ xbow->xb_link(port).link_control = 0x0;
+}
+#endif /* XBRIDGE_REGS_SIM */
+
+/*
+ * xbow_attach: the crosstalk provider has
+ * determined that there is a crossbow widget
+ * present, and has handed us the connection
+ * point for that vertex.
+ *
+ * We not only add our own vertex, but add
+ * some "xtalk switch" data to the switch
+ * vertex (at the connect point's parent) if
+ * it does not have any.
+ */
+
+/*ARGSUSED */
+int
+xbow_attach(devfs_handle_t conn)
+{
+ /*REFERENCED */
+ devfs_handle_t vhdl;
+ devfs_handle_t busv;
+ xbow_t *xbow;
+ xbow_soft_t soft;
+ int port;
+ xswitch_info_t info;
+ char devnm[MAXDEVNAME], *s;
+ xbowreg_t id;
+ int rev;
+ int i;
+ int xbow_num;
+
+#if DEBUG && ATTACH_DEBUG
+#if defined(SUPPORT_PRINTING_V_FORMAT)
+ printk("%v: xbow_attach\n", conn);
+#else
+ printk("0x%x: xbow_attach\n", conn);
+#endif
+#endif
+
+ /*
+ * Get a PIO pointer to the base of the crossbow
+ * chip.
+ */
+#ifdef XBRIDGE_REGS_SIM
+ printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: allocating %ld bytes for xbow_s\n", sizeof(xbow_t));
+ xbow = (xbow_t *) kmalloc(sizeof(xbow_t), GFP_KERNEL);
+ /*
+ * turn on ports e and f like in a real live ibrick
+ */
+ xbow_set_simulated_regs(xbow, 0xe);
+ xbow_set_simulated_regs(xbow, 0xf);
+#else
+ xbow = (xbow_t *) xtalk_piotrans_addr(conn, 0, 0, sizeof(xbow_t), 0);
+#endif /* XBRIDGE_REGS_SIM */
+
+ /*
+ * Locate the "switch" vertex: it is the parent
+ * of our connection point.
+ */
+ busv = hwgraph_connectpt_get(conn);
+#if DEBUG && ATTACH_DEBUG
+ printk("xbow_attach: Bus Vertex 0x%p, conn 0x%p, xbow register 0x%p wid= 0x%x\n", busv, conn, xbow, *(volatile u32 *)xbow);
+#endif
+
+ ASSERT(busv != GRAPH_VERTEX_NONE);
+
+ /*
+ * Create our private vertex, and connect our
+ * driver information to it. This makes it possible
+ * for diagnostic drivers to open the crossbow
+ * vertex for access to registers.
+ */
+
+ /*
+ * We need to teach xbow drivers to provide the right set of
+ * file ops.
+ */
+ vhdl = NULL;
+ vhdl = hwgraph_register(conn, EDGE_LBL_XBOW,
+ 0, DEVFS_FL_AUTO_DEVNUM,
+ 0, 0,
+ S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 0, 0,
+ /* &hcl_fops */ (void *)&vhdl, NULL);
+ if (!vhdl) {
+ printk(KERN_WARNING "xbow_attach: Unable to create char device for xbow conn %p\n",
+ (void *)conn);
+ }
+
+ /*
+ * Allocate the soft state structure and attach
+ * it to the xbow's vertex
+ */
+ NEW(soft);
+ soft->conn = conn;
+ soft->vhdl = vhdl;
+ soft->busv = busv;
+ soft->base = xbow;
+ /* does the universe really need another macro? */
+ /* xbow_soft_set(vhdl, (arbitrary_info_t) soft); */
+ hwgraph_fastinfo_set(vhdl, (arbitrary_info_t) soft);
+
+#define XBOW_NUM_SUFFIX_FORMAT "[xbow# %d]"
+
+ /* Add xbow number as a suffix to the hwgraph name of the xbow.
+ * This is helpful while looking at the error/warning messages.
+ */
+ xbow_num = 0;
+
+ /*
+ * get the name of this xbow vertex and keep the info.
+ * This is needed during errors and interupts, but as
+ * long as we have it, we can use it elsewhere.
+ */
+ s = dev_to_name(vhdl, devnm, MAXDEVNAME);
+ soft->name = kmalloc(strlen(s) + strlen(XBOW_NUM_SUFFIX_FORMAT) + 1,
+ GFP_KERNEL);
+ sprintf(soft->name,"%s"XBOW_NUM_SUFFIX_FORMAT, s,xbow_num);
+
+#ifdef XBRIDGE_REGS_SIM
+ /* my o200/ibrick has id=0x2d002049, but XXBOW_WIDGET_PART_NUM is defined
+ * as 0xd000, so I'm using that for the partnum bitfield.
+ */
+ printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: need xb_wid_id value!!\n");
+ id = 0x2d000049;
+#else
+ id = xbow->xb_wid_id;
+#endif /* XBRIDGE_REGS_SIM */
+ rev = XWIDGET_PART_REV_NUM(id);
+
+ mutex_spinlock_init(&soft->xbow_perf_lock);
+ soft->xbow_perfcnt[0].xp_perf_reg = &xbow->xb_perf_ctr_a;
+ soft->xbow_perfcnt[1].xp_perf_reg = &xbow->xb_perf_ctr_b;
+
+ /* Initialization for GBR bw allocation */
+ mutex_spinlock_init(&soft->xbow_bw_alloc_lock);
+
+#define XBOW_8_BIT_PORT_BW_MAX (400 * 1000 * 1000) /* 400 MB/s */
+#define XBOW_16_BIT_PORT_BW_MAX (800 * 1000 * 1000) /* 800 MB/s */
+
+ /* Set bandwidth hiwatermark and current values */
+ for (i = 0; i < MAX_XBOW_PORTS; i++) {
+ soft->bw_hiwm[i] = XBOW_16_BIT_PORT_BW_MAX; /* for now */
+ soft->bw_cur_used[i] = 0;
+ }
+
+ /*
+ * Enable xbow error interrupts
+ */
+ xbow->xb_wid_control = (XB_WID_CTRL_REG_ACC_IE | XB_WID_CTRL_XTALK_IE);
+
+ /*
+ * take a census of the widgets present,
+ * leaving notes at the switch vertex.
+ */
+ info = xswitch_info_new(busv);
+
+ for (port = MAX_PORT_NUM - MAX_XBOW_PORTS;
+ port < MAX_PORT_NUM; ++port) {
+ if (!xbow_link_alive(xbow, port)) {
+#if DEBUG && XBOW_DEBUG
+ printk(KERN_INFO "0x%p link %d is not alive\n",
+ busv, port);
+#endif
+ continue;
+ }
+ if (!xbow_widget_present(xbow, port)) {
+#if DEBUG && XBOW_DEBUG
+ printk(KERN_INFO "0x%p link %d is alive but no widget is present\n", busv, port);
+#endif
+ continue;
+ }
+#if DEBUG && XBOW_DEBUG
+ printk(KERN_INFO "0x%p link %d has a widget\n",
+ busv, port);
+#endif
+
+ xswitch_info_link_is_ok(info, port);
+ /*
+ * Turn some error interrupts on
+ * and turn others off. The PROM has
+ * some things turned on we don't
+ * want to see (bandwidth allocation
+ * errors for instance); so if it
+ * is not listed here, it is not on.
+ */
+ xbow->xb_link(port).link_control =
+ ( (xbow->xb_link(port).link_control
+ /*
+ * Turn off these bits; they are non-fatal,
+ * but we might want to save some statistics
+ * on the frequency of these errors.
+ * XXX FIXME XXX
+ */
+ & ~XB_CTRL_RCV_CNT_OFLOW_IE
+ & ~XB_CTRL_XMT_CNT_OFLOW_IE
+ & ~XB_CTRL_BNDWDTH_ALLOC_IE
+ & ~XB_CTRL_RCV_IE)
+ /*
+ * These are the ones we want to turn on.
+ */
+ | (XB_CTRL_ILLEGAL_DST_IE
+ | XB_CTRL_OALLOC_IBUF_IE
+ | XB_CTRL_XMT_MAX_RTRY_IE
+ | XB_CTRL_MAXREQ_TOUT_IE
+ | XB_CTRL_XMT_RTRY_IE
+ | XB_CTRL_SRC_TOUT_IE) );
+ }
+
+ xswitch_provider_register(busv, &xbow_provider);
+
+ return 0; /* attach successful */
+}
+
+/*ARGSUSED */
+int
+xbow_open(devfs_handle_t *devp, int oflag, int otyp, cred_t *credp)
+{
+ return 0;
+
+}
+
+/*ARGSUSED */
+int
+xbow_close(devfs_handle_t dev, int oflag, int otyp, cred_t *crp)
+{
+ return 0;
+}
+
+/*ARGSUSED */
+int
+xbow_map(devfs_handle_t dev, vhandl_t *vt, off_t off, size_t len, uint prot)
+{
+ devfs_handle_t vhdl = dev_to_vhdl(dev);
+ xbow_soft_t soft = xbow_soft_get(vhdl);
+ int error;
+
+ ASSERT(soft);
+ len = ctob(btoc(len));
+ /* XXX- this ignores the offset!!! */
+ error = v_mapphys(vt, (void *) soft->base, len);
+ return error;
+}
+
+/*ARGSUSED */
+int
+xbow_unmap(devfs_handle_t dev, vhandl_t *vt)
+{
+ return 0;
+}
+
+/* This contains special-case code for grio. There are plans to make
+ * this general sometime in the future, but till then this should
+ * be good enough.
+ */
+xwidgetnum_t
+xbow_widget_num_get(devfs_handle_t dev)
+{
+ devfs_handle_t tdev;
+ char devname[MAXDEVNAME];
+ xwidget_info_t xwidget_info;
+ int i;
+
+ vertex_to_name(dev, devname, MAXDEVNAME);
+
+ /* If this is a pci controller vertex, traverse up using
+ * the ".." links to get to the widget.
+ */
+ if (strstr(devname, EDGE_LBL_PCI) &&
+ strstr(devname, EDGE_LBL_CONTROLLER)) {
+ tdev = dev;
+ for (i=0; i< 2; i++) {
+ if (hwgraph_edge_get(tdev,
+ HWGRAPH_EDGELBL_DOTDOT, &tdev) !=
+ GRAPH_SUCCESS)
+ return XWIDGET_NONE;
+ }
+
+ if ((xwidget_info = xwidget_info_chk(tdev)) != NULL) {
+ return (xwidget_info_id_get(xwidget_info));
+ } else {
+ return XWIDGET_NONE;
+ }
+ }
+
+ return XWIDGET_NONE;
+}
+
+int
+xbow_ioctl(devfs_handle_t dev,
+ int cmd,
+ void *arg,
+ int flag,
+ struct cred *cr,
+ int *rvalp)
+{
+ devfs_handle_t vhdl;
+ int error = 0;
+
+#if defined (DEBUG)
+ int rc;
+ devfs_handle_t conn;
+ struct xwidget_info_s *xwidget_info;
+ xbow_soft_t xbow_soft;
+#endif
+ *rvalp = 0;
+
+ vhdl = dev_to_vhdl(dev);
+#if defined (DEBUG)
+ xbow_soft = xbow_soft_get(vhdl);
+ conn = xbow_soft->conn;
+
+ xwidget_info = xwidget_info_get(conn);
+ ASSERT_ALWAYS(xwidget_info != NULL);
+
+ rc = xwidget_hwid_is_xswitch(&xwidget_info->w_hwid);
+ ASSERT_ALWAYS(rc != 0);
+#endif
+ switch (cmd) {
+
+ case XBOWIOC_LLP_ERROR_ENABLE:
+ if ((error = xbow_enable_llp_monitor(vhdl)) != 0)
+ error = EINVAL;
+
+ break;
+
+ case XBOWIOC_LLP_ERROR_DISABLE:
+
+ if ((error = xbow_disable_llp_monitor(vhdl)) != 0)
+ error = EINVAL;
+
+ break;
+
+ default:
+ break;
+
+ }
+ return error;
+}
+
+/*
+ * xbow_widget_present: See if a device is present
+ * on the specified port of this crossbow.
+ */
+int
+xbow_widget_present(xbow_t *xbow, int port)
+{
+ if ( IS_RUNNING_ON_SIMULATOR() ) {
+ if ( (port == 14) || (port == 15) ) {
+ return 1;
+ }
+ else {
+ return 0;
+ }
+ }
+ else {
+ /* WAR: port 0xf on PIC is missing present bit */
+ /* Need this for PIC */
+ if (IS_PIC_XBOW(xbow->xb_wid_id) && port == 0xf) {
+ return 1;
+ }
+ return xbow->xb_link(port).link_aux_status & XB_AUX_STAT_PRESENT;
+ }
+}
+
+static int
+xbow_link_alive(xbow_t * xbow, int port)
+{
+ xbwX_stat_t xbow_linkstat;
+
+ xbow_linkstat.linkstatus = xbow->xb_link(port).link_status;
+ return (xbow_linkstat.link_alive);
+}
+
+/*
+ * xbow_widget_lookup
+ * Lookup the edges connected to the xbow specified, and
+ * retrieve the handle corresponding to the widgetnum
+ * specified.
+ * If not found, return 0.
+ */
+devfs_handle_t
+xbow_widget_lookup(devfs_handle_t vhdl,
+ int widgetnum)
+{
+ xswitch_info_t xswitch_info;
+ devfs_handle_t conn;
+
+ xswitch_info = xswitch_info_get(vhdl);
+ conn = xswitch_info_vhdl_get(xswitch_info, widgetnum);
+ return conn;
+}
+
+/*
+ * xbow_intr_preset: called during mlreset time
+ * if the platform specific code needs to route
+ * an xbow interrupt before the xtalk infrastructure
+ * is available for use.
+ *
+ * Also called from xbow_setwidint, so we don't
+ * replicate the guts of the routine.
+ *
+ * XXX- probably should be renamed xbow_wid_intr_set or
+ * something to reduce confusion.
+ */
+/*ARGSUSED3 */
+void
+xbow_intr_preset(void *which_widget,
+ int which_widget_intr,
+ xwidgetnum_t targ,
+ iopaddr_t addr,
+ xtalk_intr_vector_t vect)
+{
+ xbow_t *xbow = (xbow_t *) which_widget;
+
+ xbow->xb_wid_int_upper = ((0xFF000000 & (vect << 24)) |
+ (0x000F0000 & (targ << 16)) |
+ XTALK_ADDR_TO_UPPER(addr));
+ xbow->xb_wid_int_lower = XTALK_ADDR_TO_LOWER(addr);
+
+}
+
+int xbow_xmit_retry_errors = 0;
+
+int
+xbow_xmit_retry_error(xbow_soft_t soft,
+ int port)
+{
+ xswitch_info_t info;
+ devfs_handle_t vhdl;
+ widget_cfg_t *wid;
+ widgetreg_t id;
+ int part;
+ int mfgr;
+
+ wid = soft->wpio[port - BASE_XBOW_PORT];
+ if (wid == NULL) {
+ /* If we can't track down a PIO
+ * pointer to our widget yet,
+ * leave our caller knowing that
+ * we are interested in this
+ * interrupt if it occurs in
+ * the future.
+ */
+ info = xswitch_info_get(soft->busv);
+ if (!info)
+ return 1;
+ vhdl = xswitch_info_vhdl_get(info, port);
+ if (vhdl == GRAPH_VERTEX_NONE)
+ return 1;
+ wid = (widget_cfg_t *) xtalk_piotrans_addr
+ (vhdl, 0, 0, sizeof *wid, 0);
+ if (!wid)
+ return 1;
+ soft->wpio[port - BASE_XBOW_PORT] = wid;
+ }
+ id = wid->w_id;
+ part = XWIDGET_PART_NUM(id);
+ mfgr = XWIDGET_MFG_NUM(id);
+
+ /* If this thing is not a Bridge,
+ * do not activate the WAR, and
+ * tell our caller we do not need
+ * to be called again.
+ */
+ if ((part != BRIDGE_WIDGET_PART_NUM) ||
+ (mfgr != BRIDGE_WIDGET_MFGR_NUM)) {
+ /* FIXME: add Xbridge to the WAR.
+ * Shouldn't hurt anything. Later need to
+ * check if we can remove this.
+ */
+ if ((part != XBRIDGE_WIDGET_PART_NUM) ||
+ (mfgr != XBRIDGE_WIDGET_MFGR_NUM))
+ return 0;
+ }
+
+ /* count how many times we
+ * have picked up after
+ * LLP Transmit problems.
+ */
+ xbow_xmit_retry_errors++;
+
+ /* rewrite the control register
+ * to fix things up.
+ */
+ wid->w_control = wid->w_control;
+ wid->w_control;
+
+ return 1;
+}
+
+void
+xbow_update_perf_counters(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ xbow_perf_t *xbow_perf = xbow_soft->xbow_perfcnt;
+ xbow_perf_link_t *xbow_plink = xbow_soft->xbow_perflink;
+ xbow_perfcount_t perf_reg;
+ unsigned long s;
+ int link, i;
+
+ for (i = 0; i < XBOW_PERF_COUNTERS; i++, xbow_perf++) {
+ if (xbow_perf->xp_mode == XBOW_MONITOR_NONE)
+ continue;
+
+ s = mutex_spinlock(&xbow_soft->xbow_perf_lock);
+
+ perf_reg.xb_counter_val = *(xbowreg_t *) xbow_perf->xp_perf_reg;
+
+ link = perf_reg.xb_perf.link_select;
+
+ (xbow_plink + link)->xlp_cumulative[xbow_perf->xp_curmode] +=
+ ((perf_reg.xb_perf.count - xbow_perf->xp_current) & XBOW_COUNTER_MASK);
+ xbow_perf->xp_current = perf_reg.xb_perf.count;
+
+ mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
+ }
+}
+
+xbow_perf_link_t *
+xbow_get_perf_counters(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ xbow_perf_link_t *xbow_perf_link = xbow_soft->xbow_perflink;
+
+ return xbow_perf_link;
+}
+
+int
+xbow_enable_perf_counter(devfs_handle_t vhdl, int link, int mode, int counter)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ xbow_perf_t *xbow_perf = xbow_soft->xbow_perfcnt;
+ xbow_linkctrl_t xbow_link_ctrl;
+ xbow_t *xbow = xbow_soft->base;
+ xbow_perfcount_t perf_reg;
+ unsigned long s;
+ int i;
+
+ link -= BASE_XBOW_PORT;
+ if ((link < 0) || (link >= MAX_XBOW_PORTS))
+ return -1;
+
+ if ((mode < XBOW_MONITOR_NONE) || (mode > XBOW_MONITOR_DEST_LINK))
+ return -1;
+
+ if ((counter < 0) || (counter >= XBOW_PERF_COUNTERS))
+ return -1;
+
+ s = mutex_spinlock(&xbow_soft->xbow_perf_lock);
+
+ if ((xbow_perf + counter)->xp_mode && mode) {
+ mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
+ return -1;
+ }
+ for (i = 0; i < XBOW_PERF_COUNTERS; i++) {
+ if (i == counter)
+ continue;
+ if (((xbow_perf + i)->xp_link == link) &&
+ ((xbow_perf + i)->xp_mode)) {
+ mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
+ return -1;
+ }
+ }
+ xbow_perf += counter;
+
+ xbow_perf->xp_curlink = xbow_perf->xp_link = link;
+ xbow_perf->xp_curmode = xbow_perf->xp_mode = mode;
+
+ xbow_link_ctrl.xbl_ctrlword = xbow->xb_link_raw[link].link_control;
+ xbow_link_ctrl.xb_linkcontrol.perf_mode = mode;
+ xbow->xb_link_raw[link].link_control = xbow_link_ctrl.xbl_ctrlword;
+
+ perf_reg.xb_counter_val = *(xbowreg_t *) xbow_perf->xp_perf_reg;
+ perf_reg.xb_perf.link_select = link;
+ *(xbowreg_t *) xbow_perf->xp_perf_reg = perf_reg.xb_counter_val;
+ xbow_perf->xp_current = perf_reg.xb_perf.count;
+
+ mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
+ return 0;
+}
+
+xbow_link_status_t *
+xbow_get_llp_status(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ xbow_link_status_t *xbow_llp_status = xbow_soft->xbow_link_status;
+
+ return xbow_llp_status;
+}
+
+void
+xbow_update_llp_status(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ xbow_link_status_t *xbow_llp_status = xbow_soft->xbow_link_status;
+ xbow_t *xbow;
+ xbwX_stat_t lnk_sts;
+ xbow_aux_link_status_t aux_sts;
+ int link;
+ devfs_handle_t xwidget_vhdl;
+ char *xwidget_name;
+
+ xbow = (xbow_t *) xbow_soft->base;
+ for (link = 0; link < MAX_XBOW_PORTS; link++, xbow_llp_status++) {
+ /* Get the widget name corresponding the current link.
+ * Note : 0 <= link < MAX_XBOW_PORTS(8).
+ * BASE_XBOW_PORT(0x8) <= xwidget number < MAX_PORT_NUM (0x10)
+ */
+ xwidget_vhdl = xbow_widget_lookup(xbow_soft->busv,link+BASE_XBOW_PORT);
+ xwidget_name = xwidget_name_get(xwidget_vhdl);
+ aux_sts.aux_linkstatus
+ = xbow->xb_link_raw[link].link_aux_status;
+ lnk_sts.linkstatus = xbow->xb_link_raw[link].link_status_clr;
+
+ if (lnk_sts.link_alive == 0)
+ continue;
+
+ xbow_llp_status->rx_err_count +=
+ aux_sts.xb_aux_linkstatus.rx_err_cnt;
+
+ xbow_llp_status->tx_retry_count +=
+ aux_sts.xb_aux_linkstatus.tx_retry_cnt;
+
+ if (lnk_sts.linkstatus & ~(XB_STAT_RCV_ERR | XB_STAT_XMT_RTRY_ERR | XB_STAT_LINKALIVE)) {
+#ifdef LATER
+ printk(KERN_WARNING "link %d[%s]: bad status 0x%x\n",
+ link, xwidget_name, lnk_sts.linkstatus);
+#endif
+ }
+ }
+}
+
+int
+xbow_disable_llp_monitor(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+ int port;
+
+ for (port = 0; port < MAX_XBOW_PORTS; port++) {
+ xbow_soft->xbow_link_status[port].rx_err_count = 0;
+ xbow_soft->xbow_link_status[port].tx_retry_count = 0;
+ }
+
+ xbow_soft->link_monitor = 0;
+ return 0;
+}
+
+int
+xbow_enable_llp_monitor(devfs_handle_t vhdl)
+{
+ xbow_soft_t xbow_soft = xbow_soft_get(vhdl);
+
+ xbow_soft->link_monitor = 1;
+ return 0;
+}
+
+
+int
+xbow_reset_link(devfs_handle_t xconn_vhdl)
+{
+ xwidget_info_t widget_info;
+ xwidgetnum_t port;
+ xbow_t *xbow;
+ xbowreg_t ctrl;
+ xbwX_stat_t stat;
+ unsigned itick;
+ unsigned dtick;
+ static int ticks_per_ms = 0;
+
+ if (!ticks_per_ms) {
+ itick = get_timestamp();
+ us_delay(1000);
+ ticks_per_ms = get_timestamp() - itick;
+ }
+ widget_info = xwidget_info_get(xconn_vhdl);
+ port = xwidget_info_id_get(widget_info);
+
+#ifdef XBOW_K1PTR /* defined if we only have one xbow ... */
+ xbow = XBOW_K1PTR;
+#else
+ {
+ devfs_handle_t xbow_vhdl;
+ xbow_soft_t xbow_soft;
+
+ hwgraph_traverse(xconn_vhdl, ".master/xtalk/0/xbow", &xbow_vhdl);
+ xbow_soft = xbow_soft_get(xbow_vhdl);
+ xbow = xbow_soft->base;
+ }
+#endif
+
+ /*
+ * This requires three PIOs (reset the link, check for the
+ * reset, restore the control register for the link) plus
+ * 10us to wait for the reset. We allow up to 1ms for the
+ * widget to come out of reset before giving up and
+ * returning a failure.
+ */
+ ctrl = xbow->xb_link(port).link_control;
+ xbow->xb_link(port).link_reset = 0;
+ itick = get_timestamp();
+ while (1) {
+ stat.linkstatus = xbow->xb_link(port).link_status;
+ if (stat.link_alive)
+ break;
+ dtick = get_timestamp() - itick;
+ if (dtick > ticks_per_ms) {
+ return -1; /* never came out of reset */
+ }
+ DELAY(2); /* don't beat on link_status */
+ }
+ xbow->xb_link(port).link_control = ctrl;
+ return 0;
+}
+
+/*
+ * Dump xbow registers.
+ * input parameter is either a pointer to
+ * the xbow chip or the vertex handle for
+ * an xbow vertex.
+ */
+void
+idbg_xbowregs(int64_t regs)
+{
+ xbow_t *xbow;
+ int i;
+ xb_linkregs_t *link;
+
+ xbow = (xbow_t *) regs;
+
+#ifdef LATER
+ qprintf("Printing xbow registers starting at 0x%x\n", xbow);
+ qprintf("wid %x status %x erruppr %x errlower %x control %x timeout %x\n",
+ xbow->xb_wid_id, xbow->xb_wid_stat, xbow->xb_wid_err_upper,
+ xbow->xb_wid_err_lower, xbow->xb_wid_control,
+ xbow->xb_wid_req_timeout);
+ qprintf("intr uppr %x lower %x errcmd %x llp ctrl %x arb_reload %x\n",
+ xbow->xb_wid_int_upper, xbow->xb_wid_int_lower,
+ xbow->xb_wid_err_cmdword, xbow->xb_wid_llp,
+ xbow->xb_wid_arb_reload);
+#endif
+
+ for (i = 8; i <= 0xf; i++) {
+ link = &xbow->xb_link(i);
+#ifdef LATER
+ qprintf("Link %d registers\n", i);
+ qprintf("\tctrl %x stat %x arbuppr %x arblowr %x auxstat %x\n",
+ link->link_control, link->link_status,
+ link->link_arb_upper, link->link_arb_lower,
+ link->link_aux_status);
+#endif
+ }
+}
+
+
+#define XBOW_ARB_RELOAD_TICKS 25
+ /* granularity: 4 MB/s, max: 124 MB/s */
+#define GRANULARITY ((100 * 1000000) / XBOW_ARB_RELOAD_TICKS)
+
+#define XBOW_BYTES_TO_GBR(BYTES_per_s) (int) (BYTES_per_s / GRANULARITY)
+
+#define XBOW_GBR_TO_BYTES(cnt) (bandwidth_t) ((cnt) * GRANULARITY)
+
+#define CEILING_BYTES_TO_GBR(gbr, bytes_per_sec) \
+ ((XBOW_GBR_TO_BYTES(gbr) < bytes_per_sec) ? gbr+1 : gbr)
+
+#define XBOW_ARB_GBR_MAX 31
+
+#define ABS(x) ((x > 0) ? (x) : (-1 * x))
+ /* absolute value */
+
+int
+xbow_bytes_to_gbr(bandwidth_t old_bytes_per_sec, bandwidth_t bytes_per_sec)
+{
+ int gbr_granted;
+ int new_total_gbr;
+ int change_gbr;
+ bandwidth_t new_total_bw;
+
+#ifdef GRIO_DEBUG
+ printk("xbow_bytes_to_gbr: old_bytes_per_sec %lld bytes_per_sec %lld\n",
+ old_bytes_per_sec, bytes_per_sec);
+#endif /* GRIO_DEBUG */
+
+ gbr_granted = CEILING_BYTES_TO_GBR((XBOW_BYTES_TO_GBR(old_bytes_per_sec)),
+ old_bytes_per_sec);
+ new_total_bw = old_bytes_per_sec + bytes_per_sec;
+ new_total_gbr = CEILING_BYTES_TO_GBR((XBOW_BYTES_TO_GBR(new_total_bw)),
+ new_total_bw);
+
+ change_gbr = new_total_gbr - gbr_granted;
+
+#ifdef GRIO_DEBUG
+ printk("xbow_bytes_to_gbr: gbr_granted %d new_total_gbr %d change_gbr %d\n",
+ gbr_granted, new_total_gbr, change_gbr);
+#endif /* GRIO_DEBUG */
+
+ return (change_gbr);
+}
+
+/* Conversion from GBR to bytes */
+bandwidth_t
+xbow_gbr_to_bytes(int gbr)
+{
+ return (XBOW_GBR_TO_BYTES(gbr));
+}
+
+/* Given the vhdl for the desired xbow, the src and dest. widget ids
+ * and the req_bw value, this xbow driver entry point accesses the
+ * xbow registers and allocates the desired bandwidth if available.
+ *
+ * If bandwidth allocation is successful, return success else return failure.
+ */
+int
+xbow_prio_bw_alloc(devfs_handle_t vhdl,
+ xwidgetnum_t src_wid,
+ xwidgetnum_t dest_wid,
+ unsigned long long old_alloc_bw,
+ unsigned long long req_bw)
+{
+ xbow_soft_t soft = xbow_soft_get(vhdl);
+ volatile xbowreg_t *xreg;
+ xbowreg_t mask;
+ unsigned long s;
+ int error = 0;
+ bandwidth_t old_bw_BYTES, req_bw_BYTES;
+ xbowreg_t old_xreg;
+ int old_bw_GBR, req_bw_GBR, new_bw_GBR;
+
+#ifdef GRIO_DEBUG
+ printk("xbow_prio_bw_alloc: vhdl %d src_wid %d dest_wid %d req_bw %lld\n",
+ (int) vhdl, (int) src_wid, (int) dest_wid, req_bw);
+#endif
+
+ ASSERT(XBOW_WIDGET_IS_VALID(src_wid));
+ ASSERT(XBOW_WIDGET_IS_VALID(dest_wid));
+
+ s = mutex_spinlock(&soft->xbow_bw_alloc_lock);
+
+ /* Get pointer to the correct register */
+ xreg = XBOW_PRIO_ARBREG_PTR(soft->base, dest_wid, src_wid);
+
+ /* Get mask for GBR count value */
+ mask = XB_ARB_GBR_MSK << XB_ARB_GBR_SHFT(src_wid);
+
+ req_bw_GBR = xbow_bytes_to_gbr(old_alloc_bw, req_bw);
+ req_bw_BYTES = (req_bw_GBR < 0) ? (-1 * xbow_gbr_to_bytes(ABS(req_bw_GBR)))
+ : xbow_gbr_to_bytes(req_bw_GBR);
+
+#ifdef GRIO_DEBUG
+ printk("req_bw %lld req_bw_BYTES %lld req_bw_GBR %d\n",
+ req_bw, req_bw_BYTES, req_bw_GBR);
+#endif /* GRIO_DEBUG */
+
+ old_bw_BYTES = soft->bw_cur_used[(int) dest_wid - MAX_XBOW_PORTS];
+ old_xreg = *xreg;
+ old_bw_GBR = (((*xreg) & mask) >> XB_ARB_GBR_SHFT(src_wid));
+
+#ifdef GRIO_DEBUG
+ ASSERT(XBOW_BYTES_TO_GBR(old_bw_BYTES) == old_bw_GBR);
+
+ printk("old_bw_BYTES %lld old_bw_GBR %d\n", old_bw_BYTES, old_bw_GBR);
+
+ printk("req_bw_BYTES %lld old_bw_BYTES %lld soft->bw_hiwm %lld\n",
+ req_bw_BYTES, old_bw_BYTES,
+ soft->bw_hiwm[(int) dest_wid - MAX_XBOW_PORTS]);
+
+#endif /* GRIO_DEBUG */
+
+ /* Accept the request only if we don't exceed the destination
+ * port HIWATER_MARK *AND* the max. link GBR arbitration count
+ */
+ if (((old_bw_BYTES + req_bw_BYTES) <=
+ soft->bw_hiwm[(int) dest_wid - MAX_XBOW_PORTS]) &&
+ (req_bw_GBR + old_bw_GBR <= XBOW_ARB_GBR_MAX)) {
+
+ new_bw_GBR = (old_bw_GBR + req_bw_GBR);
+
+ /* Set this in the xbow link register */
+ *xreg = (old_xreg & ~mask) | \
+ (new_bw_GBR << XB_ARB_GBR_SHFT(src_wid) & mask);
+
+ soft->bw_cur_used[(int) dest_wid - MAX_XBOW_PORTS] =
+ xbow_gbr_to_bytes(new_bw_GBR);
+ } else {
+ error = 1;
+ }
+
+ mutex_spinunlock(&soft->xbow_bw_alloc_lock, s);
+
+ return (error);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)