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i965: Issue performance warnings when copying the program cache BO.

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We don't really want unnecessary buffer copying, so it'd be nice to know
when it's happening.

v2: Drop stall warnings when doing a read-only CPU mapping of the cache
    BO.  The GPU also uses it in a read-only fashion, so there won't be
    any stalls, even though the buffer is busy.  (Thanks to Chris Wilson
    for catching this mistake.)

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net> [v1]
This commit is contained in:
Kenneth Graunke 2014-08-21 10:50:31 -07:00
parent a4fe727a5d
commit 4c766c7959
1 changed files with 3 additions and 0 deletions
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3
src/mesa/drivers/dri/i965/brw_state_cache.c
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@ -241,6 +241,8 @@ brw_upload_item_data(struct brw_cache *cache,
struct brw_cache_item *item,
const void *data)
{
struct brw_context *brw = cache->brw;
/* Allocate space in the cache BO for our new program. */
if (cache->next_offset + item->size > cache->bo->size) {
uint32_t new_size = cache->bo->size * 2;
@ -255,6 +257,7 @@ brw_upload_item_data(struct brw_cache *cache,
* recreate it.
*/
if (cache->bo_used_by_gpu) {
perf_debug("Copying busy program cache buffer.\n");
brw_cache_new_bo(cache, cache->bo->size);
}