[PATCH 2/5] drm/i915/mtl: pass the GSC CS info to the GuC

[Matt Roper]

On Thu, Oct 27, 2022 at 03:15:51PM -0700, Daniele Ceraolo Spurio wrote:
> We need to tell the GuC that the GSC CS is there. The GuC interface
> swaps COMPUTE and OTHER class, so we also need to handle that.

When I first read the second sentence here, I thought you were saying
that the GuC interface had changed and redefined its own enums, but
that's not the case.  I think you just meant that the FOO_CLASS and
GUC_FOO_CLASS enums are nearly the same except that they order COMPUTE
and OTHER classes differently.  Honestly I think that's already pretty
clear from the existing values and mapping tables, even before this
patch, so I'd just leave this sentence off to avoid confusion.

Otherwise,

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> 
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c  | 11 +++++------
>  drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h |  7 +++++--
>  2 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> index 34ef4f36e660..63e3d98788bd 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> @@ -478,6 +478,11 @@ static void fill_engine_enable_masks(struct intel_gt *gt,
>  	info_map_write(info_map, engine_enabled_masks[GUC_BLITTER_CLASS], BCS_MASK(gt));
>  	info_map_write(info_map, engine_enabled_masks[GUC_VIDEO_CLASS], VDBOX_MASK(gt));
>  	info_map_write(info_map, engine_enabled_masks[GUC_VIDEOENHANCE_CLASS], VEBOX_MASK(gt));
> +
> +	/* The GSC engine is an instance (6) of OTHER_CLASS */
> +	if (gt->engine[GSC0])
> +		info_map_write(info_map, engine_enabled_masks[GUC_GSC_OTHER_CLASS],
> +			       BIT(gt->engine[GSC0]->instance));
>  }
>  
>  #define LR_HW_CONTEXT_SIZE (80 * sizeof(u32))
> @@ -519,9 +524,6 @@ static int guc_prep_golden_context(struct intel_guc *guc)
>  	}
>  
>  	for (engine_class = 0; engine_class <= MAX_ENGINE_CLASS; ++engine_class) {
> -		if (engine_class == OTHER_CLASS)
> -			continue;
> -
>  		guc_class = engine_class_to_guc_class(engine_class);
>  
>  		if (!info_map_read(&info_map, engine_enabled_masks[guc_class]))
> @@ -599,9 +601,6 @@ static void guc_init_golden_context(struct intel_guc *guc)
>  	addr_ggtt = intel_guc_ggtt_offset(guc, guc->ads_vma) + offset;
>  
>  	for (engine_class = 0; engine_class <= MAX_ENGINE_CLASS; ++engine_class) {
> -		if (engine_class == OTHER_CLASS)
> -			continue;
> -
>  		guc_class = engine_class_to_guc_class(engine_class);
>  		if (!ads_blob_read(guc, system_info.engine_enabled_masks[guc_class]))
>  			continue;
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
> index 968ebd79dce7..4ae5fc2f6002 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
> @@ -47,7 +47,8 @@
>  #define GUC_VIDEOENHANCE_CLASS		2
>  #define GUC_BLITTER_CLASS		3
>  #define GUC_COMPUTE_CLASS		4
> -#define GUC_LAST_ENGINE_CLASS		GUC_COMPUTE_CLASS
> +#define GUC_GSC_OTHER_CLASS		5
> +#define GUC_LAST_ENGINE_CLASS		GUC_GSC_OTHER_CLASS
>  #define GUC_MAX_ENGINE_CLASSES		16
>  #define GUC_MAX_INSTANCES_PER_CLASS	32
>  
> @@ -169,6 +170,7 @@ static u8 engine_class_guc_class_map[] = {
>  	[COPY_ENGINE_CLASS]       = GUC_BLITTER_CLASS,
>  	[VIDEO_DECODE_CLASS]      = GUC_VIDEO_CLASS,
>  	[VIDEO_ENHANCEMENT_CLASS] = GUC_VIDEOENHANCE_CLASS,
> +	[OTHER_CLASS]             = GUC_GSC_OTHER_CLASS,
>  	[COMPUTE_CLASS]           = GUC_COMPUTE_CLASS,
>  };
>  
> @@ -178,12 +180,13 @@ static u8 guc_class_engine_class_map[] = {
>  	[GUC_VIDEO_CLASS]        = VIDEO_DECODE_CLASS,
>  	[GUC_VIDEOENHANCE_CLASS] = VIDEO_ENHANCEMENT_CLASS,
>  	[GUC_COMPUTE_CLASS]      = COMPUTE_CLASS,
> +	[GUC_GSC_OTHER_CLASS]    = OTHER_CLASS,
>  };
>  
>  static inline u8 engine_class_to_guc_class(u8 class)
>  {
>  	BUILD_BUG_ON(ARRAY_SIZE(engine_class_guc_class_map) != MAX_ENGINE_CLASS + 1);
> -	GEM_BUG_ON(class > MAX_ENGINE_CLASS || class == OTHER_CLASS);
> +	GEM_BUG_ON(class > MAX_ENGINE_CLASS);
>  
>  	return engine_class_guc_class_map[class];
>  }
> -- 
> 2.37.3
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation