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drm/i915: Tidy up some error messages around reset failure

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On blb and pnv, we are seeing sporadic

  i915 0000:00:02.0: Resetting chip after gpu hang
  [drm:intel_gpu_reset [i915]] rcs0: timed out on STOP_RING
  [drm:i915_reset [i915]] *ERROR* Failed hw init on reset -5

which notably lack the actual root cause of the error. Ostensibly it
should be the init_ring_common() that failed, but it's error paths are
covered by DRM_ERROR.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207111545.17078-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2018-02-07 11:15:45 +00:00
parent c22b355ff7
commit 8177e11252
3 changed files with 21 additions and 14 deletions
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18
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -453,13 +453,13 @@ static int init_ring_common(struct intel_engine_cs *engine)
if (!stop_ring(engine)) {
/* G45 ring initialization often fails to reset head to zero */
DRM_DEBUG_KMS("%s head not reset to zero "
"ctl %08x head %08x tail %08x start %08x\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_HEAD(engine),
I915_READ_TAIL(engine),
I915_READ_START(engine));
DRM_DEBUG_DRIVER("%s head not reset to zero "
"ctl %08x head %08x tail %08x start %08x\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_HEAD(engine),
I915_READ_TAIL(engine),
I915_READ_START(engine));
if (!stop_ring(engine)) {
DRM_ERROR("failed to set %s head to zero "
@@ -492,8 +492,8 @@ static int init_ring_common(struct intel_engine_cs *engine)
/* WaClearRingBufHeadRegAtInit:ctg,elk */
if (I915_READ_HEAD(engine))
DRM_DEBUG("%s initialization failed [head=%08x], fudging\n",
engine->name, I915_READ_HEAD(engine));
DRM_DEBUG_DRIVER("%s initialization failed [head=%08x], fudging\n",
engine->name, I915_READ_HEAD(engine));
intel_ring_update_space(ring);
I915_WRITE_HEAD(engine, ring->head);