[Intel-gfx] [PATCH 1/6] drm/i915: Missed interrupt simulation is no more, tell the world

[Mika Kuoppala]

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

> Using the guc, we cannot disable the user interrupt generation as we use
> it for driving submission. And from Icelake, we no longer have the
> ability to individually mask interrupt generation from each engine,
> disabling our ability to fake missed interrupts.
>
> In both cases, report back to userspace that the missed interrupt
> generator is no longer available.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 1f7051e97afb..b4744a68cd88 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4117,6 +4117,17 @@ i915_ring_test_irq_set(void *data, u64 val)
>  {
>  	struct drm_i915_private *i915 = data;
>  
> +	/* GuC keeps the user interrupt permanently enabled for submission */
> +	if (USES_GUC_SUBMISSION(i915))
> +		return -ENODEV;
> +
> +	/*
> +	 * From icl, we can no longer individually mask interrupt generation
> +	 * from each engine.
> +	 */
> +	if (INTEL_GEN(i915) >= 11)
> +		return -ENODEV;

Perhaps we can go with sw masks in future.

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


> +
>  	val &= INTEL_INFO(i915)->ring_mask;
>  	DRM_DEBUG_DRIVER("Masking interrupts on rings 0x%08llx\n", val);
>  
> -- 
> 2.19.0.rc2