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i965/bufmgr: Skip wait ioctl when not busy.

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If the buffer is idle, we I915_GEM_WAIT will return immediately,
so we may as well skip the ioctl altogether.  We can't trust the
"idle" flag for external buffers, but for most, it should be fine.

Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke 2017-07-17 12:57:20 -07:00
parent 38e2142f39
commit bdae2ddff8
1 changed files with 4 additions and 0 deletions
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4
src/mesa/drivers/dri/i965/brw_bufmgr.c
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@ -924,6 +924,10 @@ brw_bo_wait(struct brw_bo *bo, int64_t timeout_ns)
struct drm_i915_gem_wait wait;
int ret;
/* If we know it's idle, don't bother with the kernel round trip */
if (bo->idle && !bo->external)
return 0;
memclear(wait);
wait.bo_handle = bo->gem_handle;
wait.timeout_ns = timeout_ns;