drm/i915/guc: Remove plain ads_blob pointer

Now we have the access to content of GuC ADS either using iosys_map
API or using a temporary buffer. Remove guc->ads_blob as there shouldn't
be updates using the bare pointer anymore.

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220216174147.3073235-17-lucas.demarchi@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc.h

@@ -147,8 +147,7 @@ struct intel_guc {
 
 	/** @ads_vma: object allocated to hold the GuC ADS */
 	struct i915_vma *ads_vma;
-	/** @ads_blob: contents of the GuC ADS */
-	struct __guc_ads_blob *ads_blob;
+	/** @ads_map: contents of the GuC ADS */
 	struct iosys_map ads_map;
 	/** @ads_regset_size: size of the save/restore regsets in the ADS */
 	u32 ads_regset_size;

drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c

@@ -667,6 +667,7 @@ static void __guc_ads_init(struct intel_guc *guc)
  */
 int intel_guc_ads_create(struct intel_guc *guc)
 {
+	void *ads_blob;
 	u32 size;
 	int ret;
 
@@ -691,14 +692,14 @@ int intel_guc_ads_create(struct intel_guc *guc)
 	size = guc_ads_blob_size(guc);
 
 	ret = intel_guc_allocate_and_map_vma(guc, size, &guc->ads_vma,
-					     (void **)&guc->ads_blob);
+					     &ads_blob);
 	if (ret)
 		return ret;
 
 	if (i915_gem_object_is_lmem(guc->ads_vma->obj))
-		iosys_map_set_vaddr_iomem(&guc->ads_map, (void __iomem *)guc->ads_blob);
+		iosys_map_set_vaddr_iomem(&guc->ads_map, (void __iomem *)ads_blob);
 	else
-		iosys_map_set_vaddr(&guc->ads_map, guc->ads_blob);
+		iosys_map_set_vaddr(&guc->ads_map, ads_blob);
 
 	__guc_ads_init(guc);
 
@@ -720,7 +721,6 @@ void intel_guc_ads_init_late(struct intel_guc *guc)
 void intel_guc_ads_destroy(struct intel_guc *guc)
 {
 	i915_vma_unpin_and_release(&guc->ads_vma, I915_VMA_RELEASE_MAP);
-	guc->ads_blob = NULL;
 	iosys_map_clear(&guc->ads_map);
 	kfree(guc->ads_regset);
 }