[Intel-gfx] [PATCH] drm/i915: Restore the kernel context after verifying the w/a

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> As a safety net, flush the engine verifications and restore the kernel
> context.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/issues/971
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Acked-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_gt.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index da2b6e2ae692..88b6c904607c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -538,6 +538,10 @@ static int __engines_verify_workarounds(struct intel_gt *gt)
>  			err = -EIO;
>  	}
>  
> +	/* Flush and restore the kernel context for safety */
> +	if (intel_gt_wait_for_idle(gt, I915_GEM_IDLE_TIMEOUT) == -ETIME)
> +		err = -EIO;
> +
>  	return err;
>  }
>  
> -- 
> 2.25.0
>
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