[Intel-gfx] [CI 1/3] drm/i915/gt: Flush GT interrupt handler before changing interrupt state

[Mika Kuoppala]

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

> Before we clear any state that may be being written by an interrupt
> handler on another core, flush the interrupt handlers.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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

> ---
>  drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> index b31ce0d60028..e8c20f80e353 100644
> --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> @@ -2656,7 +2656,10 @@ static void enable_error_interrupt(struct intel_engine_cs *engine)
>  {
>  	u32 status;
>  
> +	/* Flush ongoing GT interrupts before touching interrupt state */
> +	synchronize_hardirq(engine->i915->drm.irq);
>  	engine->execlists.error_interrupt = 0;
> +
>  	ENGINE_WRITE(engine, RING_EMR, ~0u);
>  	ENGINE_WRITE(engine, RING_EIR, ~0u); /* clear all existing errors */
>  
> -- 
> 2.20.1
>
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