Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> If we fail to recover the HW state upon resume (i.e. our attempt to
> clear the wedged bit and reset during i915_gem_sanitize() fails), then
> skip the HW restart inside i915_gem_init_hw(). We will ultimate do the
> the HW restart when sucessfully unwedgeding and reseting the HW later,
successfully unwedging
> but attempting to restore a wedged device upon resume is risky as the HW
> is in an unknown state.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index d9d39b309ce8..5993222c81ae 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4835,6 +4835,10 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
> init_unused_rings(dev_priv);
>
> BUG_ON(!dev_priv->kernel_context);
> + if (i915_terminally_wedged(&dev_priv->gpu_error)) {
> + ret = -EIO;
> + goto out;
> + }
>
> ret = i915_ppgtt_init_hw(dev_priv);
> if (ret) {
> --
> 2.15.0.rc0
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