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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-02-07 15:13:50 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-02-08 11:44:27 +0000 |
| commit | 0d73e7a095f768fad5a002bf6732c675e2aee44b (patch) | |
| tree | 1c0de6b6c77e0c8912acd095c3e18e2aed776e83 /drivers/gpu/drm/i915/i915_gem.c | |
| parent | 11a18f631959fd1ca10856c836a827683536770c (diff) | |
| download | linux-0d73e7a095f768fad5a002bf6732c675e2aee44b.tar.bz2 | |
drm/i915: Mark the device as wedged from the beginning of set-wedged
Reduce the window of opportunity for set-wedged being called
concurrently with reset (after i915_reset() has performed the
i915_gem_unset_wedged()) by moving the set_bit(I915_WEDGED) to before we
complete the inflight requests. When i915_reset() is being blocked on a
request, such completion may allow it to start and beginning resetting
the GPU before i915_gem_set_wedged() has finished (and so before
set-wedge will have marked the device as wedged). As such,
i915_gem_init_hw() may see a wedged device even from inside
i915_reset().
References: 36703e79a982 ("drm/i915: Break modeset deadlocks on reset")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207151350.20883-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 021588950a52..349f127330c8 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3205,6 +3205,9 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) intel_engine_dump(engine, &p, "%s\n", engine->name); } + set_bit(I915_WEDGED, &i915->gpu_error.flags); + smp_mb__after_atomic(); + /* * First, stop submission to hw, but do not yet complete requests by * rolling the global seqno forward (since this would complete requests @@ -3244,7 +3247,8 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) for_each_engine(engine, i915, id) { unsigned long flags; - /* Mark all pending requests as complete so that any concurrent + /* + * Mark all pending requests as complete so that any concurrent * (lockless) lookup doesn't try and wait upon the request as we * reset it. */ @@ -3254,7 +3258,6 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) spin_unlock_irqrestore(&engine->timeline->lock, flags); } - set_bit(I915_WEDGED, &i915->gpu_error.flags); wake_up_all(&i915->gpu_error.reset_queue); } |