[Intel-gfx] [PATCH] drm/i915: Mark device as wedged if we fail to resume

[Chris Wilson]

During module load, if we fail to initialise the rings, we abort the
load reporting EIO. However during resume, even though we report EIO as
we fail to reinitialize the ringbuffers, the resume continues and the
device is restored - albeit in a non-functional state. As we cannot
execute any commands on the GPU, it is effectively wedged, mark it so.

This is not sufficient to prevent UXA from persistently failing to
recover, but it is the right thing to do neverthless.

Reported-by: Jiri Kosina <jikos at jikos.cz>
References: https://bugs.freedesktop.org/show_bug.cgi?id=76554
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8a644b17f0ba..b84bb6bd97f3 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -565,6 +565,8 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
 		mutex_lock(&dev->struct_mutex);
 
 		error = i915_gem_init_hw(dev);
+		if (error)
+			atomic_set_mask(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
 		mutex_unlock(&dev->struct_mutex);
 
 		/* We need working interrupts for modeset enabling ... */
-- 
1.9.1