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authorGeorge Sapountzis <gsap7@yahoo.gr>2006-07-16 02:15:02 +0300
committerGeorge Sapountzis <gsap7@yahoo.gr>2006-10-02 22:47:14 +0300
commiteea150e776657faca7d5b76aca75a33dc74fbc9d (patch)
treebcef7cd6ace57f37acebd225b717e1d6e39ed67c /shared-core/mach64_dma.c
parentd1b31a228b72b8dd8e588f0a0cc8eeabc3845f70 (diff)
Bug 6242: [mach64] Use private DMA buffers, part #1.
Factor out from mach64_freelist_get() the code to reclaim a completed buffer, this is to improve readability for me.
Diffstat (limited to 'shared-core/mach64_dma.c')
-rw-r--r--shared-core/mach64_dma.c155
1 files changed, 80 insertions, 75 deletions
diff --git a/shared-core/mach64_dma.c b/shared-core/mach64_dma.c
index 36fddf0e..3f4394c0 100644
--- a/shared-core/mach64_dma.c
+++ b/shared-core/mach64_dma.c
@@ -1329,17 +1329,88 @@ int mach64_do_release_used_buffers(drm_mach64_private_t * dev_priv)
return 0;
}
+static int mach64_do_reclaim_completed(drm_mach64_private_t * dev_priv)
+{
+ drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
+ struct list_head *ptr;
+ struct list_head *tmp;
+ drm_mach64_freelist_t *entry;
+ u32 head, tail, ofs;
+
+ mach64_ring_tick(dev_priv, ring);
+ head = ring->head;
+ tail = ring->tail;
+
+ if (head == tail) {
+#if MACH64_EXTRA_CHECKING
+ if (MACH64_READ(MACH64_GUI_STAT) & MACH64_GUI_ACTIVE) {
+ DRM_ERROR("Empty ring with non-idle engine!\n");
+ mach64_dump_ring_info(dev_priv);
+ return -1;
+ }
+#endif
+ /* last pass is complete, so release everything */
+ mach64_do_release_used_buffers(dev_priv);
+ DRM_DEBUG("%s: idle engine, freed all buffers.\n",
+ __FUNCTION__);
+ if (list_empty(&dev_priv->free_list)) {
+ DRM_ERROR("Freelist empty with idle engine\n");
+ return -1;
+ }
+ return 0;
+ }
+ /* Look for a completed buffer and bail out of the loop
+ * as soon as we find one -- don't waste time trying
+ * to free extra bufs here, leave that to do_release_used_buffers
+ */
+ list_for_each_safe(ptr, tmp, &dev_priv->pending) {
+ entry = list_entry(ptr, drm_mach64_freelist_t, list);
+ ofs = entry->ring_ofs;
+ if (entry->discard &&
+ ((head < tail && (ofs < head || ofs >= tail)) ||
+ (head > tail && (ofs < head && ofs >= tail)))) {
+#if MACH64_EXTRA_CHECKING
+ int i;
+
+ for (i = head; i != tail; i = (i + 4) & ring->tail_mask)
+ {
+ u32 o1 = le32_to_cpu(((u32 *) ring->
+ start)[i + 1]);
+ u32 o2 = GETBUFADDR(entry->buf);
+
+ if (o1 == o2) {
+ DRM_ERROR
+ ("Attempting to free used buffer: "
+ "i=%d buf=0x%08x\n",
+ i, o1);
+ mach64_dump_ring_info(dev_priv);
+ return -1;
+ }
+ }
+#endif
+ /* found a processed buffer */
+ entry->buf->pending = 0;
+ list_del(ptr);
+ list_add_tail(ptr, &dev_priv->free_list);
+ DRM_DEBUG
+ ("%s: freed processed buffer (head=%d tail=%d "
+ "buf ring ofs=%d).\n",
+ __FUNCTION__, head, tail, ofs);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
drm_buf_t *mach64_freelist_get(drm_mach64_private_t * dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
drm_mach64_freelist_t *entry;
struct list_head *ptr;
- struct list_head *tmp;
int t;
if (list_empty(&dev_priv->free_list)) {
- u32 head, tail, ofs;
-
if (list_empty(&dev_priv->pending)) {
DRM_ERROR
("Couldn't get buffer - pending and free lists empty\n");
@@ -1351,81 +1422,15 @@ drm_buf_t *mach64_freelist_get(drm_mach64_private_t * dev_priv)
return NULL;
}
- tail = ring->tail;
for (t = 0; t < dev_priv->usec_timeout; t++) {
- mach64_ring_tick(dev_priv, ring);
- head = ring->head;
+ int ret;
- if (head == tail) {
-#if MACH64_EXTRA_CHECKING
- if (MACH64_READ(MACH64_GUI_STAT) &
- MACH64_GUI_ACTIVE) {
- DRM_ERROR
- ("Empty ring with non-idle engine!\n");
- mach64_dump_ring_info(dev_priv);
- return NULL;
- }
-#endif
- /* last pass is complete, so release everything */
- mach64_do_release_used_buffers(dev_priv);
- DRM_DEBUG
- ("%s: idle engine, freed all buffers.\n",
- __FUNCTION__);
- if (list_empty(&dev_priv->free_list)) {
- DRM_ERROR
- ("Freelist empty with idle engine\n");
- return NULL;
- }
+ ret = mach64_do_reclaim_completed(dev_priv);
+ if (ret == 0)
goto _freelist_entry_found;
- }
- /* Look for a completed buffer and bail out of the loop
- * as soon as we find one -- don't waste time trying
- * to free extra bufs here, leave that to do_release_used_buffers
- */
- list_for_each_safe(ptr, tmp, &dev_priv->pending) {
- entry =
- list_entry(ptr, drm_mach64_freelist_t,
- list);
- ofs = entry->ring_ofs;
- if (entry->discard &&
- ((head < tail
- && (ofs < head || ofs >= tail))
- || (head > tail
- && (ofs < head && ofs >= tail)))) {
-#if MACH64_EXTRA_CHECKING
- int i;
-
- for (i = head; i != tail;
- i = (i + 4) & ring->tail_mask) {
- u32 o1 =
- le32_to_cpu(((u32 *) ring->
- start)[i + 1]);
- u32 o2 = GETBUFADDR(entry->buf);
-
- if (o1 == o2) {
- DRM_ERROR
- ("Attempting to free used buffer: "
- "i=%d buf=0x%08x\n",
- i, o1);
- mach64_dump_ring_info
- (dev_priv);
- return NULL;
- }
- }
-#endif
- /* found a processed buffer */
- entry->buf->pending = 0;
- list_del(ptr);
- entry->buf->used = 0;
- list_add_tail(ptr,
- &dev_priv->placeholders);
- DRM_DEBUG
- ("%s: freed processed buffer (head=%d tail=%d "
- "buf ring ofs=%d).\n",
- __FUNCTION__, head, tail, ofs);
- return entry->buf;
- }
- }
+ if (ret < 0)
+ return NULL;
+
DRM_UDELAY(1);
}
mach64_dump_ring_info(dev_priv);