drm/i915/execlists: Leave resetting ring to intel_ring

We need to allow concurrent intel_context_unpin, which means avoiding
doing destructive operations like intel_ring_reset(). This was already
fixed for intel_ring_unpin() in commit 228f71a888fe ("drm/i915/gt: Make
intel_ring_unpin() safe for concurrent pint"), but I overlooked that
execlists_context_unpin() also made the same mistake.

Reported-by: Matthew Brost <matthew.brost@intel.com>
Fixes: 650750226ff3 ("drm/i915/gt: Drop mutex serialisation between context pin/unpin")
References: 228f71a888fe ("drm/i915/gt: Make intel_ring_unpin() safe for concurrent pint")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200115175829.2761329-1-chris@chris-wilson.co.uk
(cherry picked from commit f3c0efc9fe7a4e61544034f525348a3aa86ac5aa)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 5d8c1ebe07313e73ad2916cf486fc19f4b5f7671..d879e5e926af4ba7108a7107945cd1f35f9b2df8 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2532,7 +2532,6 @@ static void execlists_context_unpin(struct intel_context *ce)
                      ce->engine);
 
        i915_gem_object_unpin_map(ce->state->obj);
-       intel_ring_reset(ce->ring, ce->ring->tail);
 }
 
 static void