patch-2.4.8 linux/drivers/char/drm/dma.c

• Lines: 547
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.7/linux/drivers/char/drm/dma.c
• Orig date: Tue Jul 3 17:08:19 2001

diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/dma.c linux/drivers/char/drm/dma.c
@@ -1,546 +0,0 @@
-/* dma.c -- DMA IOCTL and function support -*- linux-c -*-
- * Created: Fri Mar 19 14:30:16 1999 by faith@precisioninsight.com
- *
- * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
- * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- * 
- * Authors:
- *    Rickard E. (Rik) Faith <faith@valinuxa.com>
- *
- */
-
-#define __NO_VERSION__
-#include "drmP.h"
-
-#include <linux/interrupt.h>	/* For task queue support */
-
-void drm_dma_setup(drm_device_t *dev)
-{
-	int i;
-	
-	if (!(dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER))) {
-                printk(KERN_ERR "drm_dma_setup: can't drm_alloc dev->dma");
-                return;
-        }       
-	memset(dev->dma, 0, sizeof(*dev->dma));
-	for (i = 0; i <= DRM_MAX_ORDER; i++)
-		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
-}
-
-void drm_dma_takedown(drm_device_t *dev)
-{
-	drm_device_dma_t  *dma = dev->dma;
-	int		  i, j;
-
-	if (!dma) return;
-	
-				/* Clear dma buffers */
-	for (i = 0; i <= DRM_MAX_ORDER; i++) {
-		if (dma->bufs[i].seg_count) {
-			DRM_DEBUG("order %d: buf_count = %d,"
-				  " seg_count = %d\n",
-				  i,
-				  dma->bufs[i].buf_count,
-				  dma->bufs[i].seg_count);
-			for (j = 0; j < dma->bufs[i].seg_count; j++) {
-				drm_free_pages(dma->bufs[i].seglist[j],
-					       dma->bufs[i].page_order,
-					       DRM_MEM_DMA);
-			}
-			drm_free(dma->bufs[i].seglist,
-				 dma->bufs[i].seg_count
-				 * sizeof(*dma->bufs[0].seglist),
-				 DRM_MEM_SEGS);
-		}
-	   	if(dma->bufs[i].buf_count) {
-		   	for(j = 0; j < dma->bufs[i].buf_count; j++) {
-			   if(dma->bufs[i].buflist[j].dev_private) {
-			      drm_free(dma->bufs[i].buflist[j].dev_private,
-				       dma->bufs[i].buflist[j].dev_priv_size,
-				       DRM_MEM_BUFS);
-			   }
-			}
-		   	drm_free(dma->bufs[i].buflist,
-				 dma->bufs[i].buf_count *
-				 sizeof(*dma->bufs[0].buflist),
-				 DRM_MEM_BUFS);
-		   	drm_freelist_destroy(&dma->bufs[i].freelist);
-		}
-	}
-	
-	if (dma->buflist) {
-		drm_free(dma->buflist,
-			 dma->buf_count * sizeof(*dma->buflist),
-			 DRM_MEM_BUFS);
-	}
-
-	if (dma->pagelist) {
-		drm_free(dma->pagelist,
-			 dma->page_count * sizeof(*dma->pagelist),
-			 DRM_MEM_PAGES);
-	}
-	drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
-	dev->dma = NULL;
-}
-
-#if DRM_DMA_HISTOGRAM
-/* This is slow, but is useful for debugging. */
-int drm_histogram_slot(unsigned long count)
-{
-	int value = DRM_DMA_HISTOGRAM_INITIAL;
-	int slot;
-
-	for (slot = 0;
-	     slot < DRM_DMA_HISTOGRAM_SLOTS;
-	     ++slot, value = DRM_DMA_HISTOGRAM_NEXT(value)) {
-		if (count < value) return slot;
-	}
-	return DRM_DMA_HISTOGRAM_SLOTS - 1;
-}
-
-void drm_histogram_compute(drm_device_t *dev, drm_buf_t *buf)
-{
-	cycles_t queued_to_dispatched;
-	cycles_t dispatched_to_completed;
-	cycles_t completed_to_freed;
-	int	 q2d, d2c, c2f, q2c, q2f;
-	
-	if (buf->time_queued) {
-		queued_to_dispatched	= (buf->time_dispatched
-					   - buf->time_queued);
-		dispatched_to_completed = (buf->time_completed
-					   - buf->time_dispatched);
-		completed_to_freed	= (buf->time_freed
-					   - buf->time_completed);
-
-		q2d = drm_histogram_slot(queued_to_dispatched);
-		d2c = drm_histogram_slot(dispatched_to_completed);
-		c2f = drm_histogram_slot(completed_to_freed);
-
-		q2c = drm_histogram_slot(queued_to_dispatched
-					 + dispatched_to_completed);
-		q2f = drm_histogram_slot(queued_to_dispatched
-					 + dispatched_to_completed
-					 + completed_to_freed);
-		
-		atomic_inc(&dev->histo.total);
-		atomic_inc(&dev->histo.queued_to_dispatched[q2d]);
-		atomic_inc(&dev->histo.dispatched_to_completed[d2c]);
-		atomic_inc(&dev->histo.completed_to_freed[c2f]);
-		
-		atomic_inc(&dev->histo.queued_to_completed[q2c]);
-		atomic_inc(&dev->histo.queued_to_freed[q2f]);
-
-	}
-	buf->time_queued     = 0;
-	buf->time_dispatched = 0;
-	buf->time_completed  = 0;
-	buf->time_freed	     = 0;
-}
-#endif
-
-void drm_free_buffer(drm_device_t *dev, drm_buf_t *buf)
-{
-	drm_device_dma_t *dma = dev->dma;
-
-	if (!buf) return;
-	
-	buf->waiting  = 0;
-	buf->pending  = 0;
-	buf->pid      = 0;
-	buf->used     = 0;
-#if DRM_DMA_HISTOGRAM
-	buf->time_completed = get_cycles();
-#endif
-	if (waitqueue_active(&buf->dma_wait)) {
-		wake_up_interruptible(&buf->dma_wait);
-	} else {
-				/* If processes are waiting, the last one
-				   to wake will put the buffer on the free
-				   list.  If no processes are waiting, we
-				   put the buffer on the freelist here. */
-		drm_freelist_put(dev, &dma->bufs[buf->order].freelist, buf);
-	}
-}
-
-void drm_reclaim_buffers(drm_device_t *dev, pid_t pid)
-{
-	drm_device_dma_t *dma = dev->dma;
-	int		 i;
-
-	if (!dma) return;
-	for (i = 0; i < dma->buf_count; i++) {
-		if (dma->buflist[i]->pid == pid) {
-			switch (dma->buflist[i]->list) {
-			case DRM_LIST_NONE:
-				drm_free_buffer(dev, dma->buflist[i]);
-				break;
-			case DRM_LIST_WAIT:
-				dma->buflist[i]->list = DRM_LIST_RECLAIM;
-				break;
-			default:
-				/* Buffer already on hardware. */
-				break;
-			}
-		}
-	}
-}
-
-int drm_context_switch(drm_device_t *dev, int old, int new)
-{
-	char	    buf[64];
-	drm_queue_t *q;
-
-	atomic_inc(&dev->total_ctx);
-
-	if (test_and_set_bit(0, &dev->context_flag)) {
-		DRM_ERROR("Reentering -- FIXME\n");
-		return -EBUSY;
-	}
-
-#if DRM_DMA_HISTOGRAM
-	dev->ctx_start = get_cycles();
-#endif
-	
-	DRM_DEBUG("Context switch from %d to %d\n", old, new);
-
-	if (new >= dev->queue_count) {
-		clear_bit(0, &dev->context_flag);
-		return -EINVAL;
-	}
-
-	if (new == dev->last_context) {
-		clear_bit(0, &dev->context_flag);
-		return 0;
-	}
-	
-	q = dev->queuelist[new];
-	atomic_inc(&q->use_count);
-	if (atomic_read(&q->use_count) == 1) {
-		atomic_dec(&q->use_count);
-		clear_bit(0, &dev->context_flag);
-		return -EINVAL;
-	}
-
-	if (drm_flags & DRM_FLAG_NOCTX) {
-		drm_context_switch_complete(dev, new);
-	} else {
-		sprintf(buf, "C %d %d\n", old, new);
-		drm_write_string(dev, buf);
-	}
-	
-	atomic_dec(&q->use_count);
-	
-	return 0;
-}
-
-int drm_context_switch_complete(drm_device_t *dev, int new)
-{
-	drm_device_dma_t *dma = dev->dma;
-	
-	dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */
-	dev->last_switch  = jiffies;
-	
-	if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
-		DRM_ERROR("Lock isn't held after context switch\n");
-	}
-
-	if (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
-		if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
-				  DRM_KERNEL_CONTEXT)) {
-			DRM_ERROR("Cannot free lock\n");
-		}
-	}
-	
-#if DRM_DMA_HISTOGRAM
-	atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
-						      - dev->ctx_start)]);
-		   
-#endif
-	clear_bit(0, &dev->context_flag);
-	wake_up_interruptible(&dev->context_wait);
-	
-	return 0;
-}
-
-void drm_clear_next_buffer(drm_device_t *dev)
-{
-	drm_device_dma_t *dma = dev->dma;
-	
-	dma->next_buffer = NULL;
-	if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {
-		wake_up_interruptible(&dma->next_queue->flush_queue);
-	}
-	dma->next_queue	 = NULL;
-}
-
-
-int drm_select_queue(drm_device_t *dev, void (*wrapper)(unsigned long))
-{
-	int	   i;
-	int	   candidate = -1;
-	int	   j	     = jiffies;
-
-	if (!dev) {
-		DRM_ERROR("No device\n");
-		return -1;
-	}
-	if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) {
-				/* This only happens between the time the
-				   interrupt is initialized and the time
-				   the queues are initialized. */
-		return -1;
-	}
-
-				/* Doing "while locked" DMA? */
-	if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {
-		return DRM_KERNEL_CONTEXT;
-	}
-
-				/* If there are buffers on the last_context
-				   queue, and we have not been executing
-				   this context very long, continue to
-				   execute this context. */
-	if (dev->last_switch <= j
-	    && dev->last_switch + DRM_TIME_SLICE > j
-	    && DRM_WAITCOUNT(dev, dev->last_context)) {
-		return dev->last_context;
-	}
-
-				/* Otherwise, find a candidate */
-	for (i = dev->last_checked + 1; i < dev->queue_count; i++) {
-		if (DRM_WAITCOUNT(dev, i)) {
-			candidate = dev->last_checked = i;
-			break;
-		}
-	}
-
-	if (candidate < 0) {
-		for (i = 0; i < dev->queue_count; i++) {
-			if (DRM_WAITCOUNT(dev, i)) {
-				candidate = dev->last_checked = i;
-				break;
-			}
-		}
-	}
-
-	if (wrapper
-	    && candidate >= 0
-	    && candidate != dev->last_context
-	    && dev->last_switch <= j
-	    && dev->last_switch + DRM_TIME_SLICE > j) {
-		if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) {
-			del_timer(&dev->timer);
-			dev->timer.function = wrapper;
-			dev->timer.data	    = (unsigned long)dev;
-			dev->timer.expires  = dev->last_switch+DRM_TIME_SLICE;
-			add_timer(&dev->timer);
-		}
-		return -1;
-	}
-
-	return candidate;
-}
-
-
-int drm_dma_enqueue(drm_device_t *dev, drm_dma_t *d)
-{
-	int		  i;
-	drm_queue_t	  *q;
-	drm_buf_t	  *buf;
-	int		  idx;
-	int		  while_locked = 0;
-	drm_device_dma_t  *dma = dev->dma;
-	DECLARE_WAITQUEUE(entry, current);
-
-	DRM_DEBUG("%d\n", d->send_count);
-
-	if (d->flags & _DRM_DMA_WHILE_LOCKED) {
-		int context = dev->lock.hw_lock->lock;
-		
-		if (!_DRM_LOCK_IS_HELD(context)) {
-			DRM_ERROR("No lock held during \"while locked\""
-				  " request\n");
-			return -EINVAL;
-		}
-		if (d->context != _DRM_LOCKING_CONTEXT(context)
-		    && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {
-			DRM_ERROR("Lock held by %d while %d makes"
-				  " \"while locked\" request\n",
-				  _DRM_LOCKING_CONTEXT(context),
-				  d->context);
-			return -EINVAL;
-		}
-		q = dev->queuelist[DRM_KERNEL_CONTEXT];
-		while_locked = 1;
-	} else {
-		q = dev->queuelist[d->context];
-	}
-
-
-	atomic_inc(&q->use_count);
-	if (atomic_read(&q->block_write)) {
-		add_wait_queue(&q->write_queue, &entry);
-		atomic_inc(&q->block_count);
-		for (;;) {
-			current->state = TASK_INTERRUPTIBLE;
-			if (!atomic_read(&q->block_write)) break;
-			schedule();
-			if (signal_pending(current)) {
-				atomic_dec(&q->use_count);
-				remove_wait_queue(&q->write_queue, &entry);
-				return -EINTR;
-			}
-		}
-		atomic_dec(&q->block_count);
-		current->state = TASK_RUNNING;
-		remove_wait_queue(&q->write_queue, &entry);
-	}
-	
-	for (i = 0; i < d->send_count; i++) {
-		idx = d->send_indices[i];
-		if (idx < 0 || idx >= dma->buf_count) {
-			atomic_dec(&q->use_count);
-			DRM_ERROR("Index %d (of %d max)\n",
-				  d->send_indices[i], dma->buf_count - 1);
-			return -EINVAL;
-		}
-		buf = dma->buflist[ idx ];
-		if (buf->pid != current->pid) {
-			atomic_dec(&q->use_count);
-			DRM_ERROR("Process %d using buffer owned by %d\n",
-				  current->pid, buf->pid);
-			return -EINVAL;
-		}
-		if (buf->list != DRM_LIST_NONE) {
-			atomic_dec(&q->use_count);
-			DRM_ERROR("Process %d using buffer %d on list %d\n",
-				  current->pid, buf->idx, buf->list);
-		}
-		buf->used	  = d->send_sizes[i];
-		buf->while_locked = while_locked;
-		buf->context	  = d->context;
-		if (!buf->used) {
-			DRM_ERROR("Queueing 0 length buffer\n");
-		}
-		if (buf->pending) {
-			atomic_dec(&q->use_count);
-			DRM_ERROR("Queueing pending buffer:"
-				  " buffer %d, offset %d\n",
-				  d->send_indices[i], i);
-			return -EINVAL;
-		}
-		if (buf->waiting) {
-			atomic_dec(&q->use_count);
-			DRM_ERROR("Queueing waiting buffer:"
-				  " buffer %d, offset %d\n",
-				  d->send_indices[i], i);
-			return -EINVAL;
-		}
-		buf->waiting = 1;
-		if (atomic_read(&q->use_count) == 1
-		    || atomic_read(&q->finalization)) {
-			drm_free_buffer(dev, buf);
-		} else {
-			drm_waitlist_put(&q->waitlist, buf);
-			atomic_inc(&q->total_queued);
-		}
-	}
-	atomic_dec(&q->use_count);
-	
-	return 0;
-}
-
-static int drm_dma_get_buffers_of_order(drm_device_t *dev, drm_dma_t *d,
-					int order)
-{
-	int		  i;
-	drm_buf_t	  *buf;
-	drm_device_dma_t  *dma = dev->dma;
-	
-	for (i = d->granted_count; i < d->request_count; i++) {
-		buf = drm_freelist_get(&dma->bufs[order].freelist,
-				       d->flags & _DRM_DMA_WAIT);
-		if (!buf) break;
-		if (buf->pending || buf->waiting) {
-			DRM_ERROR("Free buffer %d in use by %d (w%d, p%d)\n",
-				  buf->idx,
-				  buf->pid,
-				  buf->waiting,
-				  buf->pending);
-		}
-		buf->pid     = current->pid;
-		if (copy_to_user(&d->request_indices[i],
-				 &buf->idx,
-				 sizeof(buf->idx)))
-			return -EFAULT;
-
-		if (copy_to_user(&d->request_sizes[i],
-				 &buf->total,
-				 sizeof(buf->total)))
-			return -EFAULT;
-
-		++d->granted_count;
-	}
-	return 0;
-}
-
-
-int drm_dma_get_buffers(drm_device_t *dev, drm_dma_t *dma)
-{
-	int		  order;
-	int		  retcode = 0;
-	int		  tmp_order;
-	
-	order = drm_order(dma->request_size);
-
-	dma->granted_count = 0;
-	retcode		   = drm_dma_get_buffers_of_order(dev, dma, order);
-
-	if (dma->granted_count < dma->request_count
-	    && (dma->flags & _DRM_DMA_SMALLER_OK)) {
-		for (tmp_order = order - 1;
-		     !retcode
-			     && dma->granted_count < dma->request_count
-			     && tmp_order >= DRM_MIN_ORDER;
-		     --tmp_order) {
-			
-			retcode = drm_dma_get_buffers_of_order(dev, dma,
-							       tmp_order);
-		}
-	}
-
-	if (dma->granted_count < dma->request_count
-	    && (dma->flags & _DRM_DMA_LARGER_OK)) {
-		for (tmp_order = order + 1;
-		     !retcode
-			     && dma->granted_count < dma->request_count
-			     && tmp_order <= DRM_MAX_ORDER;
-		     ++tmp_order) {
-			
-			retcode = drm_dma_get_buffers_of_order(dev, dma,
-							       tmp_order);
-		}
-	}
-	return 0;
-}