Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> The guc (and huc) currently inexcruitably depend on struct_mutex for
> device reinitialisation from inside the reset, and indeed taking any
> mutex here is verboten (as we must be able to reset from underneath any
> of our mutexes). That makes recovering the guc unviable without, for
> example, reserving contiguous vma space and pages for it to use.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Acked-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
We do want ack from Daniele as well.
-Mika
> ---
> drivers/gpu/drm/i915/i915_reset.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
> index f9512e07646d..c9a844d2626f 100644
> --- a/drivers/gpu/drm/i915/i915_reset.c
> +++ b/drivers/gpu/drm/i915/i915_reset.c
> @@ -590,6 +590,9 @@ int intel_gpu_reset(struct drm_i915_private *i915, unsigned int engine_mask)
>
> bool intel_has_gpu_reset(struct drm_i915_private *i915)
> {
> + if (USES_GUC(i915))
> + return false;
> +
> return intel_get_gpu_reset(i915);
> }
>
> --
> 2.20.1
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