Re: [PATCH v3 27/37] drm/i915: Don't try to place HWS in non-existing mappable region

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Quoting Matthew Auld (2019-08-09 23:26:33)
> From: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
> 
> HWS placement restrictions can't just rely on HAS_LLC flag.
> 
> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gt/intel_engine_cs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> index 634ef45b77da..46658ecd8975 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> @@ -512,7 +512,7 @@ static int pin_ggtt_status_page(struct intel_engine_cs *engine,
>         unsigned int flags;
>  
>         flags = PIN_GLOBAL;
> -       if (!HAS_LLC(engine->i915))
> +       if (!HAS_LLC(engine->i915) && HAS_MAPPABLE_APERTURE(engine->i915))

Should we risk IS_GEN() <= 9 instead?

>                 /*
>                  * On g33, we cannot place HWS above 256MiB, so
>                  * restrict its pinning to the low mappable arena.
> -- 
> 2.20.1
> 
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