xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/i915: Add a tracepoint for using a semaphore

Browse Source 
So that we can find the callers who introduce a ring stall. A single
ring stall is not too unwelcome, the right issue becomes when they start
to interlock and prevent any concurrent work. That, however, is a little
tricker to detect with a mere tracepoint!

v2: Rebrand it as a ring event, rather than an object event.
v3: Include the seqno in the tracepoint for posterity or something.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson
2013-09-25 11:43:28 +01:00
committed by Daniel Vetter
parent f56383cb9f
commit b52b89da09
2 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_gem.c
View File

@@ -2625,6 +2625,7 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj,
if (ret)
return ret;
trace_i915_gem_ring_sync_to(from, to, seqno);
ret = to->sync_to(to, from, seqno);
if (!ret)
/* We use last_read_seqno because sync_to()