Re: [PATCH 05/15] drm/i915/guc/slpc: Allocate, initialize and release SLPC

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

On 26.07.2021 21:07, Vinay Belgaumkar wrote:
> Allocate data structures for SLPC and functions for
> initializing on host side.
> 
> v2: Address review comments (Michal W)
> v3: Remove unnecessary header includes (Michal W)
> 
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
> Signed-off-by: Sundaresan Sujaritha <sujaritha.sundaresan@intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc.c        | 11 ++++++
>  drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c   | 36 ++++++++++++++++++-
>  .../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h |  2 ++
>  3 files changed, 48 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> index 5b0f8c541b69..13d162353b1a 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> @@ -336,6 +336,12 @@ int intel_guc_init(struct intel_guc *guc)
>  			goto err_ct;
>  	}
>  
> +	if (intel_guc_slpc_is_used(guc)) {
> +		ret = intel_guc_slpc_init(&guc->slpc);
> +		if (ret)
> +			goto err_submission;
> +	}
> +
>  	/* now that everything is perma-pinned, initialize the parameters */
>  	guc_init_params(guc);
>  
> @@ -346,6 +352,8 @@ int intel_guc_init(struct intel_guc *guc)
>  
>  	return 0;
>  
> +err_submission:
> +	intel_guc_submission_fini(guc);
>  err_ct:
>  	intel_guc_ct_fini(&guc->ct);
>  err_ads:
> @@ -368,6 +376,9 @@ void intel_guc_fini(struct intel_guc *guc)
>  
>  	i915_ggtt_disable_guc(gt->ggtt);
>  
> +	if (intel_guc_slpc_is_used(guc))
> +		intel_guc_slpc_fini(&guc->slpc);
> +
>  	if (intel_guc_submission_is_used(guc))
>  		intel_guc_submission_fini(guc);
>  
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> index 7275100ef8f8..bae4e33db0f8 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> @@ -12,6 +12,16 @@ static inline struct intel_guc *slpc_to_guc(struct intel_guc_slpc *slpc)
>  	return container_of(slpc, struct intel_guc, slpc);
>  }
>  
> +static inline struct intel_gt *slpc_to_gt(struct intel_guc_slpc *slpc)
> +{
> +	return guc_to_gt(slpc_to_guc(slpc));
> +}
> +
> +static inline struct drm_i915_private *slpc_to_i915(struct intel_guc_slpc *slpc)
> +{
> +	return slpc_to_gt(slpc)->i915;
> +}
> +
>  static bool __detect_slpc_supported(struct intel_guc *guc)
>  {
>  	/* GuC SLPC is unavailable for pre-Gen12 */
> @@ -35,11 +45,35 @@ void intel_guc_slpc_init_early(struct intel_guc_slpc *slpc)
>  	guc->slpc_selected = __guc_slpc_selected(guc);
>  }
>  
> +static int slpc_shared_data_init(struct intel_guc_slpc *slpc)
> +{
> +	struct intel_guc *guc = slpc_to_guc(slpc);
> +	struct drm_i915_private *i915 = slpc_to_i915(slpc);
> +	u32 size = PAGE_ALIGN(sizeof(struct slpc_shared_data));
> +	int err;
> +
> +	err = intel_guc_allocate_and_map_vma(guc, size, &slpc->vma, (void **)&slpc->vaddr);
> +	if (unlikely(err)) {
> +		drm_err(&i915->drm,
> +			"Failed to allocate SLPC struct (err=%pe)\n",
> +			ERR_PTR(err));
> +		return err;
> +	}
> +
> +	return err;
> +}
> +
>  int intel_guc_slpc_init(struct intel_guc_slpc *slpc)
>  {
> -	return 0;
> +	GEM_BUG_ON(slpc->vma);
> +
> +	return slpc_shared_data_init(slpc);
>  }
>  
>  void intel_guc_slpc_fini(struct intel_guc_slpc *slpc)
>  {
> +	if (!slpc->vma)
> +		return;
> +
> +	i915_vma_unpin_and_release(&slpc->vma, I915_VMA_RELEASE_MAP);
>  }
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> index bfe4a7f9ce15..edcf4c05bd9f 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> @@ -7,6 +7,8 @@
>  #define _INTEL_GUC_SLPC_TYPES_H_
>  
>  struct intel_guc_slpc {
> +	struct i915_vma *vma;
> +	struct slpc_shared_data *vaddr;
>  };
>  
>  #endif
> 

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>