summaryrefslogtreecommitdiff
path: root/bsd/drm_lists.h
diff options
context:
space:
mode:
authorDavid Dawes <dawes@xfree86.org>2002-01-27 18:23:04 +0000
committerDavid Dawes <dawes@xfree86.org>2002-01-27 18:23:04 +0000
commit16bd14926e02e4dbc6e74689bdb3eb90f30a0233 (patch)
tree9d7cb6b98165c9e2a9091c41a39acca11d6fa162 /bsd/drm_lists.h
parentf18a6d836b5e0081dff9217b44e88e74c421c576 (diff)
Initial revision
Diffstat (limited to 'bsd/drm_lists.h')
-rw-r--r--bsd/drm_lists.h236
1 files changed, 236 insertions, 0 deletions
diff --git a/bsd/drm_lists.h b/bsd/drm_lists.h
new file mode 100644
index 00000000..ea6d34a7
--- /dev/null
+++ b/bsd/drm_lists.h
@@ -0,0 +1,236 @@
+/* drm_lists.h -- Buffer list handling routines -*- linux-c -*-
+ * Created: Mon Apr 19 20:54:22 1999 by faith@valinux.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
+ * VA LINUX SYSTEMS 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>
+ * Gareth Hughes <gareth@valinux.com>
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#if __HAVE_DMA_WAITLIST
+
+int DRM(waitlist_create)(drm_waitlist_t *bl, int count)
+{
+ if (bl->count)
+ DRM_OS_RETURN( EINVAL );
+
+ bl->bufs = DRM(alloc)((bl->count + 2) * sizeof(*bl->bufs),
+ DRM_MEM_BUFLISTS);
+
+ if(!bl->bufs) DRM_OS_RETURN(ENOMEM);
+
+ bl->count = count;
+ bl->rp = bl->bufs;
+ bl->wp = bl->bufs;
+ bl->end = &bl->bufs[bl->count+1];
+ DRM_OS_SPININIT( bl->write_lock, "writelock" );
+ DRM_OS_SPININIT( bl->read_lock, "readlock" );
+ return 0;
+}
+
+int DRM(waitlist_destroy)(drm_waitlist_t *bl)
+{
+ if (bl->rp != bl->wp)
+ DRM_OS_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);
+ if (!left) {
+ DRM_ERROR("Overflow while adding buffer %d from pid %d\n",
+ buf->idx, buf->pid);
+ DRM_OS_RETURN( EINVAL );
+ }
+#if __HAVE_DMA_HISTOGRAM
+ getnanotime(&buf->time_queued);
+#endif
+ buf->list = DRM_LIST_WAIT;
+
+ DRM_OS_SPINLOCK(&bl->write_lock);
+ s = spldrm();
+ *bl->wp = buf;
+ if (++bl->wp >= bl->end) bl->wp = bl->bufs;
+ splx(s);
+ DRM_OS_SPINUNLOCK(&bl->write_lock);
+
+ return 0;
+}
+
+drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl)
+{
+ drm_buf_t *buf;
+ int s;
+
+ DRM_OS_SPINLOCK(&bl->read_lock);
+ s = spldrm();
+ buf = *bl->rp;
+ if (bl->rp == bl->wp) {
+ splx(s);
+ DRM_OS_SPINUNLOCK(&bl->read_lock);
+ return NULL;
+ }
+ if (++bl->rp >= bl->end) bl->rp = bl->bufs;
+ splx(s);
+ DRM_OS_SPINUNLOCK(&bl->read_lock);
+
+ return buf;
+}
+
+#endif /* __HAVE_DMA_WAITLIST */
+
+
+#if __HAVE_DMA_FREELIST
+
+int DRM(freelist_create)(drm_freelist_t *bl, int count)
+{
+ atomic_set(&bl->count, 0);
+ bl->next = NULL;
+ bl->waiting = 0;
+
+ bl->low_mark = 0;
+ bl->high_mark = 0;
+ atomic_set(&bl->wfh, 0);
+ DRM_OS_SPININIT( bl->lock, "freelistlock" );
+ ++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 __HAVE_DMA_HISTOGRAM
+ getnanotime(&buf->time_queued);
+ DRM(histogram_compute)(dev, buf);
+#endif
+ buf->list = DRM_LIST_FREE;
+
+ DRM_OS_SPINLOCK( &bl->lock );
+ buf->next = bl->next;
+ bl->next = buf;
+ DRM_OS_SPINUNLOCK( &bl->lock );
+
+ atomic_inc(&bl->count);
+ if (atomic_read(&bl->count) > dma->buf_count) {
+ DRM_ERROR("%ld of %d buffers free after addition of %d\n",
+ (unsigned long)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);
+ DRM_OS_WAKEUP_INT(&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 */
+ DRM_OS_SPINLOCK(&bl->lock);
+ if (!bl->next) {
+ DRM_OS_SPINUNLOCK(&bl->lock);
+ return NULL;
+ }
+ buf = bl->next;
+ bl->next = bl->next->next;
+ DRM_OS_SPINUNLOCK(&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;
+ 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)) {
+ if (block) {
+ for (;;) {
+ if (!atomic_read(&bl->wfh)
+ && (buf = DRM(freelist_try(bl)))) break;
+ error = tsleep(&bl->waiting, PZERO|PCATCH,
+ "drmfg", 0);
+ if (error)
+ break;
+ }
+ }
+ return buf;
+ }
+
+ return DRM(freelist_try)(bl);
+}
+
+#endif /* __HAVE_DMA_FREELIST */