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-rw-r--r--bsd/drm/lists.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/bsd/drm/lists.c b/bsd/drm/lists.c
new file mode 100644
index 00000000..9f9b5f7a
--- /dev/null
+++ b/bsd/drm/lists.c
@@ -0,0 +1,258 @@
+/* lists.c -- Buffer list handling routines -*- c -*-
+ * Created: Mon Apr 19 20:54:22 1999 by faith@precisioninsight.com
+ * Revised: Fri Aug 20 09:27:01 1999 by faith@precisioninsight.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * 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.
+ *
+ * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/lists.c,v 1.3 1999/08/20 15:07:02 faith Exp $
+ * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/lists.c,v 1.1 1999/09/25 14:38:01 dawes Exp $
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+int drm_waitlist_create(drm_waitlist_t *bl, int count)
+{
+ DRM_DEBUG("%d\n", 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];
+ simple_lock_init(&bl->write_lock);
+ simple_lock_init(&bl->read_lock);
+ return 0;
+}
+
+int drm_waitlist_destroy(drm_waitlist_t *bl)
+{
+ DRM_DEBUG("\n");
+ 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;
+ int s;
+
+ left = DRM_LEFTCOUNT(bl);
+ DRM_DEBUG("put %d (%d left, rp = %p, wp = %p)\n",
+ buf->idx, left, bl->rp, bl->wp);
+ if (!left) {
+ DRM_ERROR("Overflow while adding buffer %d from pid %d\n",
+ buf->idx, buf->pid);
+ return EINVAL;
+ }
+#if DRM_DMA_HISTOGRAM
+ getnanotime(&buf->time_queued);
+#endif
+ buf->list = DRM_LIST_WAIT;
+
+ simple_lock(&bl->write_lock);
+ s = spldrm();
+ *bl->wp = buf;
+ if (++bl->wp >= bl->end) bl->wp = bl->bufs;
+ splx(s);
+ simple_unlock(&bl->write_lock);
+
+ return 0;
+}
+
+drm_buf_t *drm_waitlist_get(drm_waitlist_t *bl)
+{
+ drm_buf_t *buf;
+ int s;
+
+ simple_lock(&bl->read_lock);
+ s = spldrm();
+ buf = *bl->rp;
+ if (bl->rp == bl->wp) {
+ splx(s);
+ simple_unlock(&bl->read_lock);
+ return NULL;
+ }
+ if (++bl->rp >= bl->end) bl->rp = bl->bufs;
+ splx(s);
+ simple_unlock(&bl->read_lock);
+
+ DRM_DEBUG("get %d\n", buf->idx);
+ return buf;
+}
+
+int drm_freelist_create(drm_freelist_t *bl, int count)
+{
+ DRM_DEBUG("\n");
+ atomic_set(&bl->count, 0);
+ bl->next = NULL;
+ bl->waiting = 0;
+ bl->low_mark = 0;
+ bl->high_mark = 0;
+ atomic_set(&bl->wfh, 0);
+ ++bl->initialized;
+ return 0;
+}
+
+int drm_freelist_destroy(drm_freelist_t *bl)
+{
+ DRM_DEBUG("\n");
+ 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)
+{
+ unsigned int old;
+ unsigned int new;
+ char failed;
+ int count = 0;
+ 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);
+ }
+ DRM_DEBUG("%d, count = %d, wfh = %d, w%d, p%d\n",
+ buf->idx, atomic_read(&bl->count), atomic_read(&bl->wfh),
+ buf->waiting, buf->pending);
+ if (!bl) return 1;
+#if DRM_DMA_HISTOGRAM
+ getnanotime(&buf->time_freed);
+ drm_histogram_compute(dev, buf);
+#endif
+ buf->list = DRM_LIST_FREE;
+ do {
+ old = (unsigned long)bl->next;
+ buf->next = (void *)old;
+ new = (unsigned long)buf;
+ _DRM_CAS(&bl->next, old, new, failed);
+ if (++count > DRM_LOOPING_LIMIT) {
+ DRM_ERROR("Looping\n");
+ return 1;
+ }
+ } while (failed);
+ 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);
+ if (bl->waiting)
+ wakeup(&bl->waiting);
+ }
+ return 0;
+}
+
+static drm_buf_t *drm_freelist_try(drm_freelist_t *bl)
+{
+ unsigned int old;
+ unsigned int new;
+ char failed;
+ drm_buf_t *buf;
+ int count = 0;
+
+ if (!bl) return NULL;
+
+ /* Get buffer */
+ do {
+ old = (unsigned int)bl->next;
+ if (!old) {
+ return NULL;
+ }
+ new = (unsigned long)bl->next->next;
+ _DRM_CAS(&bl->next, old, new, failed);
+ if (++count > DRM_LOOPING_LIMIT) {
+ DRM_ERROR("Looping\n");
+ return NULL;
+ }
+ } while (failed);
+ atomic_dec(&bl->count);
+
+ buf = (drm_buf_t *)old;
+ buf->next = NULL;
+ buf->list = DRM_LIST_NONE;
+ DRM_DEBUG("%d, count = %d, wfh = %d, w%d, p%d\n",
+ buf->idx, atomic_read(&bl->count), atomic_read(&bl->wfh),
+ buf->waiting, buf->pending);
+ 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;
+ int error;
+
+ 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)) {
+ DRM_DEBUG("Block = %d, count = %d, wfh = %d\n",
+ block, atomic_read(&bl->count),
+ atomic_read(&bl->wfh));
+ if (block) {
+ atomic_inc(&bl->waiting);
+ for (;;) {
+ if (!atomic_read(&bl->wfh)
+ && (buf = drm_freelist_try(bl))) break;
+ error = tsleep(&bl->waiting, PZERO|PCATCH,
+ "drmfg", 0);
+ if (error)
+ break;
+ }
+ atomic_dec(&bl->waiting);
+ }
+ return buf;
+ }
+
+ DRM_DEBUG("Count = %d, wfh = %d\n",
+ atomic_read(&bl->count), atomic_read(&bl->wfh));
+ return drm_freelist_try(bl);
+}
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