Re: [Intel-gfx] [PATCH V5 1/5] drm/i915/gt: Add support of mocs propagation

[Matt Roper <matthew.d.roper@intel.com>]

On Fri, Sep 03, 2021 at 02:51:49PM +0530, Ayaz A Siddiqui wrote:
> Now there are lots of Command and registers that require mocs index
> programming.
> So propagating mocs_index from mocs to gt so that it can be
> used directly without having platform-specific checks.
> 
> V2:
> Changed 'i915_mocs_index_gt' to anonymous structure.
> 
> Cc: CQ Tang<cq.tang@intel.com>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> Signed-off-by: Ayaz A Siddiqui <ayaz.siddiqui@intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt.c       |  2 ++
>  drivers/gpu/drm/i915/gt/intel_gt_types.h |  4 ++++
>  drivers/gpu/drm/i915/gt/intel_mocs.c     | 13 +++++++++++++
>  drivers/gpu/drm/i915/gt/intel_mocs.h     |  1 +
>  4 files changed, 20 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 62d40c9866427..2aeaae036a6f8 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -682,6 +682,8 @@ int intel_gt_init(struct intel_gt *gt)
>  		goto err_pm;
>  	}
>  
> +	set_mocs_index(gt);
> +
>  	err = intel_engines_init(gt);
>  	if (err)
>  		goto err_engines;
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> index a81e21bf1bd1a..6fdcde64c1800 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> @@ -192,6 +192,10 @@ struct intel_gt {
>  
>  		unsigned long mslice_mask;
>  	} info;
> +
> +	struct {
> +		u8 uc_index;
> +	} mocs;
>  };
>  
>  enum intel_gt_scratch_field {
> diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.c b/drivers/gpu/drm/i915/gt/intel_mocs.c
> index 582c4423b95d6..7ccac15d9a331 100644
> --- a/drivers/gpu/drm/i915/gt/intel_mocs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_mocs.c
> @@ -22,6 +22,7 @@ struct drm_i915_mocs_table {
>  	unsigned int size;
>  	unsigned int n_entries;
>  	const struct drm_i915_mocs_entry *table;
> +	u8 uc_index;
>  };
>  
>  /* Defines for the tables (XXX_MOCS_0 - XXX_MOCS_63) */
> @@ -340,14 +341,18 @@ static unsigned int get_mocs_settings(const struct drm_i915_private *i915,
>  {
>  	unsigned int flags;
>  
> +	memset(table, 0, sizeof(struct drm_i915_mocs_table));
> +
>  	if (IS_DG1(i915)) {
>  		table->size = ARRAY_SIZE(dg1_mocs_table);
>  		table->table = dg1_mocs_table;
> +		table->uc_index = 1;
>  		table->n_entries = GEN9_NUM_MOCS_ENTRIES;
>  	} else if (GRAPHICS_VER(i915) >= 12) {
>  		table->size  = ARRAY_SIZE(tgl_mocs_table);
>  		table->table = tgl_mocs_table;
>  		table->n_entries = GEN9_NUM_MOCS_ENTRIES;
> +		table->uc_index = 3;
>  	} else if (GRAPHICS_VER(i915) == 11) {
>  		table->size  = ARRAY_SIZE(icl_mocs_table);
>  		table->table = icl_mocs_table;
> @@ -504,6 +509,14 @@ static u32 global_mocs_offset(void)
>  	return i915_mmio_reg_offset(GEN12_GLOBAL_MOCS(0));
>  }
>  
> +void set_mocs_index(struct intel_gt *gt)

Hi Ayaz,

I overlooked it when doing my review before, but for non-static
functions like this we should have a proper function name prefix
(intel_* in this case).

Would you mind writing a small patch to rename this?

Thanks.


Matt

> +{
> +	struct drm_i915_mocs_table table;
> +
> +	get_mocs_settings(gt->i915, &table);
> +	gt->mocs.uc_index = table.uc_index;
> +}
> +
>  void intel_mocs_init(struct intel_gt *gt)
>  {
>  	struct drm_i915_mocs_table table;
> diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.h b/drivers/gpu/drm/i915/gt/intel_mocs.h
> index d83274f5163bd..8a09d64b115f7 100644
> --- a/drivers/gpu/drm/i915/gt/intel_mocs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_mocs.h
> @@ -36,5 +36,6 @@ struct intel_gt;
>  
>  void intel_mocs_init(struct intel_gt *gt);
>  void intel_mocs_init_engine(struct intel_engine_cs *engine);
> +void set_mocs_index(struct intel_gt *gt);
>  
>  #endif
> -- 
> 2.26.2
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795