[Intel-gfx] [PATCH 3/7] drm/i915: Restrict sentinel requests further

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Disallow sentinel requests follow previous sentinels to make request
cancellation work better when faced with a chain of requests which have
all been marked as in error.

Because in cases where we end up with a stream of cancelled requests we
want to turn of request coalescing so they each will get individually
skipped by the execlists_schedule_in (which is called per ELSP port, not
per request).

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 4c2acb5a6c0a..4b870eca9693 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -896,7 +896,7 @@ static bool can_merge_rq(const struct i915_request *prev,
 	if (__i915_request_is_complete(next))
 		return true;
 
-	if (unlikely((i915_request_flags(prev) ^ i915_request_flags(next)) &
+	if (unlikely((i915_request_flags(prev) | i915_request_flags(next)) &
 		     (BIT(I915_FENCE_FLAG_NOPREEMPT) |
 		      BIT(I915_FENCE_FLAG_SENTINEL))))
 		return false;
-- 
2.27.0