[PATCH] drm/i915: Use correct index for backtracking HUNG semaphores

[PATCH] drm/i915: Use correct index for backtracking HUNG semaphores

[Chris Wilson]

When decoding the semaphores inside hangcheck, we need to use the hw-id
and not the local array index.

Fixes: de1add360522 ("drm/i915: Decouple execbuf uAPI ...")
Testcase: igt/gem_exec_whisper/hang # gen6-7
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
---
 drivers/gpu/drm/i915/i915_irq.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6ed5b240ee06..238a353454e9 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2877,7 +2877,7 @@ semaphore_wait_to_signaller_ring(struct intel_engine_cs *engine, u32 ipehr,
 			if (engine == signaller)
 				continue;
 
-			if (offset == signaller->semaphore.signal_ggtt[engine->id])
+			if (offset == signaller->semaphore.signal_ggtt[engine->hw_id])
 				return signaller;
 		}
 	} else {
@@ -2887,13 +2887,13 @@ semaphore_wait_to_signaller_ring(struct intel_engine_cs *engine, u32 ipehr,
 			if(engine == signaller)
 				continue;
 
-			if (sync_bits == signaller->semaphore.mbox.wait[engine->id])
+			if (sync_bits == signaller->semaphore.mbox.wait[engine->hw_id])
 				return signaller;
 		}
 	}
 
-	DRM_DEBUG_DRIVER("No signaller ring found for ring %i, ipehr 0x%08x, offset 0x%016llx\n",
-			 engine->id, ipehr, offset);
+	DRM_DEBUG_DRIVER("No signaller ring found for %s, ipehr 0x%08x, offset 0x%016llx\n",
+			 engine->name, ipehr, offset);
 
 	return ERR_PTR(-ENODEV);
 }
-- 
2.9.3

Re: [Intel-gfx] [PATCH] drm/i915: Use correct index for backtracking HUNG semaphores

[Joonas Lahtinen]

On la, 2016-10-01 at 20:42 +0100, Chris Wilson wrote:
> When decoding the semaphores inside hangcheck, we need to use the hw-id
> and not the local array index.
> 
> Fixes: de1add360522 ("drm/i915: Decouple execbuf uAPI ...")
> Testcase: igt/gem_exec_whisper/hang # gen6-7
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: stable@vger.kernel.org

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation