[Intel-gfx] [PATCH 4/4] drm/i915: Include interesting seqno in the missed breadcrumb debug

[Mika Kuoppala]

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

> Knowing the neighbouring seqno (current on hw, last submitted to hw)
> provide some useful breadcrumbs to the debug log.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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

> ---
>  drivers/gpu/drm/i915/intel_breadcrumbs.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
> index 9ccbf26124c6..35da5928bd8a 100644
> --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
> +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
> @@ -64,10 +64,12 @@ static unsigned long wait_timeout(void)
>  
>  static noinline void missed_breadcrumb(struct intel_engine_cs *engine)
>  {
> -	DRM_DEBUG_DRIVER("%s missed breadcrumb at %pF, irq posted? %s\n",
> +	DRM_DEBUG_DRIVER("%s missed breadcrumb at %pF, irq posted? %s, current seqno=%x, last=%x\n",
>  			 engine->name, __builtin_return_address(0),
>  			 yesno(test_bit(ENGINE_IRQ_BREADCRUMB,
> -					&engine->irq_posted)));
> +					&engine->irq_posted)),
> +			 intel_engine_get_seqno(engine),
> +			 intel_engine_last_submit(engine));
>  
>  	set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
>  }
> -- 
> 2.11.0
>
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