drm/i915/guc: Convert golden context init to iosys_map

Now the map is saved during creation, so use it to initialize the
golden context, reading from shmem and writing to either system or IO
memory.

v2: Do not use a map iterator: add an offset to keep track of
destination

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: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220216174147.3073235-7-lucas.demarchi@intel.com

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

@@ -512,18 +512,16 @@ static struct intel_engine_cs *find_engine_state(struct intel_gt *gt, u8 engine_
 
 static void guc_init_golden_context(struct intel_guc *guc)
 {
-	struct __guc_ads_blob *blob = guc->ads_blob;
 	struct intel_engine_cs *engine;
 	struct intel_gt *gt = guc_to_gt(guc);
-	u32 addr_ggtt, offset;
-	u32 total_size = 0, alloc_size, real_size;
+	unsigned long offset;
+	u32 addr_ggtt, total_size = 0, alloc_size, real_size;
 	u8 engine_class, guc_class;
-	u8 *ptr;
 
 	if (!intel_uc_uses_guc_submission(&gt->uc))
 		return;
 
-	GEM_BUG_ON(!blob);
+	GEM_BUG_ON(iosys_map_is_null(&guc->ads_map));
 
 	/*
 	 * Go back and fill in the golden context data now that it is
@@ -531,15 +529,13 @@ static void guc_init_golden_context(struct intel_guc *guc)
 	 */
 	offset = guc_ads_golden_ctxt_offset(guc);
 	addr_ggtt = intel_guc_ggtt_offset(guc, guc->ads_vma) + offset;
-	ptr = ((u8 *)blob) + 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 (!blob->system_info.engine_enabled_masks[guc_class])
+		if (!ads_blob_read(guc, system_info.engine_enabled_masks[guc_class]))
 			continue;
 
 		real_size = intel_engine_context_size(gt, engine_class);
@@ -550,18 +546,20 @@ static void guc_init_golden_context(struct intel_guc *guc)
 		if (!engine) {
 			drm_err(&gt->i915->drm, "No engine state recorded for class %d!\n",
 				engine_class);
-			blob->ads.eng_state_size[guc_class] = 0;
-			blob->ads.golden_context_lrca[guc_class] = 0;
+			ads_blob_write(guc, ads.eng_state_size[guc_class], 0);
+			ads_blob_write(guc, ads.golden_context_lrca[guc_class], 0);
 			continue;
 		}
 
-		GEM_BUG_ON(blob->ads.eng_state_size[guc_class] !=
+		GEM_BUG_ON(ads_blob_read(guc, ads.eng_state_size[guc_class]) !=
 			   real_size - LRC_SKIP_SIZE);
-		GEM_BUG_ON(blob->ads.golden_context_lrca[guc_class] != addr_ggtt);
+		GEM_BUG_ON(ads_blob_read(guc, ads.golden_context_lrca[guc_class]) != addr_ggtt);
+
 		addr_ggtt += alloc_size;
 
-		shmem_read(engine->default_state, 0, ptr, real_size);
-		ptr += alloc_size;
+		shmem_read_to_iosys_map(engine->default_state, 0, &guc->ads_map,
+					offset, real_size);
+		offset += alloc_size;
 	}
 
 	GEM_BUG_ON(guc->ads_golden_ctxt_size != total_size);