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drm/i915: Wait for reset to complete before returning from debugfs/i915_wedged

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Provide some serialisation between user operations by waiting for the
reset initiated by setting i915_wedged to complete.

The automatic wait here makes
        echo 1 > i915_wedged; cat i915_error_state
do the right thing, and not risk reporting "No error collected".

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170316171305.12972-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-03-16 17:13:05 +00:00
parent 2e8f9d3229
commit d3df42b76f
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/i915_debugfs.c
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@ -4135,6 +4135,10 @@ i915_wedged_set(void *data, u64 val)
i915_handle_error(dev_priv, val,
"Manually setting wedged to %llu", val);
wait_on_bit(&dev_priv->gpu_error.flags,
I915_RESET_HANDOFF,
TASK_UNINTERRUPTIBLE);
return 0;
}