patch-2.4.8 linux/drivers/char/drm/lists.c
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- Lines: 219
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.4.7/linux/drivers/char/drm/lists.c
- Orig date:
Sun Oct 1 20:00:00 2000
diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/lists.c linux/drivers/char/drm/lists.c
@@ -1,218 +0,0 @@
-/* lists.c -- Buffer list handling routines -*- linux-c -*-
- * Created: Mon Apr 19 20:54:22 1999 by faith@precisioninsight.com
- *
- * Copyright 1999 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@valinux.com>
- *
- */
-
-#define __NO_VERSION__
-#include "drmP.h"
-
-int drm_waitlist_create(drm_waitlist_t *bl, int count)
-{
- if (bl->count) return -EINVAL;
-
- bl->count = count;
- bl->bufs = drm_alloc((bl->count + 2) * sizeof(*bl->bufs),
- DRM_MEM_BUFLISTS);
- bl->rp = bl->bufs;
- bl->wp = bl->bufs;
- bl->end = &bl->bufs[bl->count+1];
- bl->write_lock = SPIN_LOCK_UNLOCKED;
- bl->read_lock = SPIN_LOCK_UNLOCKED;
- return 0;
-}
-
-int drm_waitlist_destroy(drm_waitlist_t *bl)
-{
- if (bl->rp != bl->wp) return -EINVAL;
- if (bl->bufs) drm_free(bl->bufs,
- (bl->count + 2) * sizeof(*bl->bufs),
- DRM_MEM_BUFLISTS);
- bl->count = 0;
- bl->bufs = NULL;
- bl->rp = NULL;
- bl->wp = NULL;
- bl->end = NULL;
- return 0;
-}
-
-int drm_waitlist_put(drm_waitlist_t *bl, drm_buf_t *buf)
-{
- int left;
- unsigned long flags;
-
- left = DRM_LEFTCOUNT(bl);
- if (!left) {
- DRM_ERROR("Overflow while adding buffer %d from pid %d\n",
- buf->idx, buf->pid);
- return -EINVAL;
- }
-#if DRM_DMA_HISTOGRAM
- buf->time_queued = get_cycles();
-#endif
- buf->list = DRM_LIST_WAIT;
-
- spin_lock_irqsave(&bl->write_lock, flags);
- *bl->wp = buf;
- if (++bl->wp >= bl->end) bl->wp = bl->bufs;
- spin_unlock_irqrestore(&bl->write_lock, flags);
-
- return 0;
-}
-
-drm_buf_t *drm_waitlist_get(drm_waitlist_t *bl)
-{
- drm_buf_t *buf;
- unsigned long flags;
-
- spin_lock_irqsave(&bl->read_lock, flags);
- buf = *bl->rp;
- if (bl->rp == bl->wp) {
- spin_unlock_irqrestore(&bl->read_lock, flags);
- return NULL;
- }
- if (++bl->rp >= bl->end) bl->rp = bl->bufs;
- spin_unlock_irqrestore(&bl->read_lock, flags);
-
- return buf;
-}
-
-int drm_freelist_create(drm_freelist_t *bl, int count)
-{
- atomic_set(&bl->count, 0);
- bl->next = NULL;
- init_waitqueue_head(&bl->waiting);
- bl->low_mark = 0;
- bl->high_mark = 0;
- atomic_set(&bl->wfh, 0);
- bl->lock = SPIN_LOCK_UNLOCKED;
- ++bl->initialized;
- return 0;
-}
-
-int drm_freelist_destroy(drm_freelist_t *bl)
-{
- atomic_set(&bl->count, 0);
- bl->next = NULL;
- return 0;
-}
-
-int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf)
-{
- drm_device_dma_t *dma = dev->dma;
-
- if (!dma) {
- DRM_ERROR("No DMA support\n");
- return 1;
- }
-
- if (buf->waiting || buf->pending || buf->list == DRM_LIST_FREE) {
- DRM_ERROR("Freed buffer %d: w%d, p%d, l%d\n",
- buf->idx, buf->waiting, buf->pending, buf->list);
- }
- if (!bl) return 1;
-#if DRM_DMA_HISTOGRAM
- buf->time_freed = get_cycles();
- drm_histogram_compute(dev, buf);
-#endif
- buf->list = DRM_LIST_FREE;
-
- spin_lock(&bl->lock);
- buf->next = bl->next;
- bl->next = buf;
- spin_unlock(&bl->lock);
-
- atomic_inc(&bl->count);
- if (atomic_read(&bl->count) > dma->buf_count) {
- DRM_ERROR("%d of %d buffers free after addition of %d\n",
- atomic_read(&bl->count), dma->buf_count, buf->idx);
- return 1;
- }
- /* Check for high water mark */
- if (atomic_read(&bl->wfh) && atomic_read(&bl->count)>=bl->high_mark) {
- atomic_set(&bl->wfh, 0);
- wake_up_interruptible(&bl->waiting);
- }
- return 0;
-}
-
-static drm_buf_t *drm_freelist_try(drm_freelist_t *bl)
-{
- drm_buf_t *buf;
-
- if (!bl) return NULL;
-
- /* Get buffer */
- spin_lock(&bl->lock);
- if (!bl->next) {
- spin_unlock(&bl->lock);
- return NULL;
- }
- buf = bl->next;
- bl->next = bl->next->next;
- spin_unlock(&bl->lock);
-
- atomic_dec(&bl->count);
- buf->next = NULL;
- buf->list = DRM_LIST_NONE;
- if (buf->waiting || buf->pending) {
- DRM_ERROR("Free buffer %d: w%d, p%d, l%d\n",
- buf->idx, buf->waiting, buf->pending, buf->list);
- }
-
- return buf;
-}
-
-drm_buf_t *drm_freelist_get(drm_freelist_t *bl, int block)
-{
- drm_buf_t *buf = NULL;
- DECLARE_WAITQUEUE(entry, current);
-
- if (!bl || !bl->initialized) return NULL;
-
- /* Check for low water mark */
- if (atomic_read(&bl->count) <= bl->low_mark) /* Became low */
- atomic_set(&bl->wfh, 1);
- if (atomic_read(&bl->wfh)) {
- if (block) {
- add_wait_queue(&bl->waiting, &entry);
- for (;;) {
- current->state = TASK_INTERRUPTIBLE;
- if (!atomic_read(&bl->wfh)
- && (buf = drm_freelist_try(bl))) break;
- schedule();
- if (signal_pending(current)) break;
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&bl->waiting, &entry);
- }
- return buf;
- }
-
- return drm_freelist_try(bl);
-}
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