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drm/i915/gt: Only unwedge if we can reset first

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Unwedging the GPU requires a successful GPU reset before we restore the
default submission, or else we may see residual context switch events
that we were not expecting.

v2: Pull in the special-case reset_clobbers_display, and explain why it
should be safe in the context of unwedging.

v3: Just forget all about resets before unwedging if it will clobber the
display; risk it all.

Reported-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20190927160335.10622-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-09-27 17:03:35 +01:00
parent 50d16d44cc
commit 1d6f1d16d3
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/i915/gt/intel_reset.c
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@ -821,6 +821,7 @@ static bool __intel_gt_unset_wedged(struct intel_gt *gt)
struct intel_gt_timelines *timelines = &gt->timelines;
struct intel_timeline *tl;
unsigned long flags;
bool ok;
if (!test_bit(I915_WEDGED, &gt->reset.flags))
return true;
@ -867,7 +868,12 @@ static bool __intel_gt_unset_wedged(struct intel_gt *gt)
}
spin_unlock_irqrestore(&timelines->lock, flags);
intel_gt_sanitize(gt, false);
/* We must reset pending GPU events before restoring our submission */
ok = !HAS_EXECLISTS(gt->i915); /* XXX better agnosticism desired */
if (!INTEL_INFO(gt->i915)->gpu_reset_clobbers_display)
ok = __intel_gt_reset(gt, ALL_ENGINES) == 0;
if (!ok)
return false;
/*
* Undo nop_submit_request. We prevent all new i915 requests from