drm/i915/guc: Use guc_class instead of engine_class in fw interface

GuC has its own defines for the engine classes. They're currently
mapping 1:1 to the defines used by the driver, but there is no guarantee
this will continue in the future. Given that we've been caught off-guard
in the past by similar divergences, we can prepare for the changes by
introducing helper functions to convert from engine class to GuC class and
back again.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210603051630.2635-21-matthew.brost@intel.com

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -265,6 +265,7 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
 	const struct engine_info *info = &intel_engines[id];
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_engine_cs *engine;
+	u8 guc_class;
 
 	BUILD_BUG_ON(MAX_ENGINE_CLASS >= BIT(GEN11_ENGINE_CLASS_WIDTH));
 	BUILD_BUG_ON(MAX_ENGINE_INSTANCE >= BIT(GEN11_ENGINE_INSTANCE_WIDTH));
@@ -293,9 +294,10 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
 	engine->i915 = i915;
 	engine->gt = gt;
 	engine->uncore = gt->uncore;
-	engine->mmio_base = __engine_mmio_base(i915, info->mmio_bases);
 	engine->hw_id = info->hw_id;
-	engine->guc_id = MAKE_GUC_ID(info->class, info->instance);
+	guc_class = engine_class_to_guc_class(info->class);
+	engine->guc_id = MAKE_GUC_ID(guc_class, info->instance);
+	engine->mmio_base = __engine_mmio_base(i915, info->mmio_bases);
 
 	engine->irq_handler = nop_irq_handler;
 

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

@@ -6,6 +6,7 @@
 #include "gt/intel_gt.h"
 #include "gt/intel_lrc.h"
 #include "intel_guc_ads.h"
+#include "intel_guc_fwif.h"
 #include "intel_uc.h"
 #include "i915_drv.h"
 
@@ -104,7 +105,7 @@ static void guc_mapping_table_init(struct intel_gt *gt,
 				GUC_MAX_INSTANCES_PER_CLASS;
 
 	for_each_engine(engine, gt, id) {
-		u8 guc_class = engine->class;
+		u8 guc_class = engine_class_to_guc_class(engine->class);
 
 		system_info->mapping_table[guc_class][engine->instance] =
 			engine->instance;
@@ -124,7 +125,7 @@ static void __guc_ads_init(struct intel_guc *guc)
 	struct __guc_ads_blob *blob = guc->ads_blob;
 	const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
 	u32 base;
-	u8 engine_class;
+	u8 engine_class, guc_class;
 
 	/* GuC scheduling policies */
 	guc_policies_init(&blob->policies);
@@ -140,22 +141,25 @@ static void __guc_ads_init(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);
+
 		/*
 		 * TODO: Set context pointer to default state to allow
 		 * GuC to re-init guilty contexts after internal reset.
 		 */
-		blob->ads.golden_context_lrca[engine_class] = 0;
+		blob->ads.golden_context_lrca[guc_class] = 0;
-		blob->ads.eng_state_size[engine_class] =
+		blob->ads.eng_state_size[guc_class] =
 			intel_engine_context_size(guc_to_gt(guc),
 						  engine_class) -
 			skipped_size;
 	}
 
 	/* System info */
-	blob->system_info.engine_enabled_masks[RENDER_CLASS] = 1;
+	blob->system_info.engine_enabled_masks[GUC_RENDER_CLASS] = 1;
-	blob->system_info.engine_enabled_masks[COPY_ENGINE_CLASS] = 1;
+	blob->system_info.engine_enabled_masks[GUC_BLITTER_CLASS] = 1;
-	blob->system_info.engine_enabled_masks[VIDEO_DECODE_CLASS] = VDBOX_MASK(gt);
+	blob->system_info.engine_enabled_masks[GUC_VIDEO_CLASS] = VDBOX_MASK(gt);
-	blob->system_info.engine_enabled_masks[VIDEO_ENHANCEMENT_CLASS] = VEBOX_MASK(gt);
+	blob->system_info.engine_enabled_masks[GUC_VIDEOENHANCE_CLASS] = VEBOX_MASK(gt);
 
 	blob->system_info.generic_gt_sysinfo[GUC_GENERIC_GT_SYSINFO_SLICE_ENABLED] =
 		hweight8(gt->info.sseu.slice_mask);

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

@@ -9,6 +9,7 @@
 #include <linux/bits.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
+#include "gt/intel_engine_types.h"
 
 #include "abi/guc_actions_abi.h"
 #include "abi/guc_errors_abi.h"
@@ -32,6 +33,12 @@
 #define GUC_VIDEO_ENGINE2		4
 #define GUC_MAX_ENGINES_NUM		(GUC_VIDEO_ENGINE2 + 1)
 
+#define GUC_RENDER_CLASS		0
+#define GUC_VIDEO_CLASS			1
+#define GUC_VIDEOENHANCE_CLASS		2
+#define GUC_BLITTER_CLASS		3
+#define GUC_RESERVED_CLASS		4
+#define GUC_LAST_ENGINE_CLASS		GUC_RESERVED_CLASS
 #define GUC_MAX_ENGINE_CLASSES		16
 #define GUC_MAX_INSTANCES_PER_CLASS	32
 
@@ -129,6 +136,25 @@
 #define GUC_ID_TO_ENGINE_INSTANCE(guc_id) \
 	(((guc_id) & GUC_ENGINE_INSTANCE_MASK) >> GUC_ENGINE_INSTANCE_SHIFT)
 
+static inline u8 engine_class_to_guc_class(u8 class)
+{
+	BUILD_BUG_ON(GUC_RENDER_CLASS != RENDER_CLASS);
+	BUILD_BUG_ON(GUC_BLITTER_CLASS != COPY_ENGINE_CLASS);
+	BUILD_BUG_ON(GUC_VIDEO_CLASS != VIDEO_DECODE_CLASS);
+	BUILD_BUG_ON(GUC_VIDEOENHANCE_CLASS != VIDEO_ENHANCEMENT_CLASS);
+	GEM_BUG_ON(class > MAX_ENGINE_CLASS || class == OTHER_CLASS);
+
+	return class;
+}
+
+static inline u8 guc_class_to_engine_class(u8 guc_class)
+{
+	GEM_BUG_ON(guc_class > GUC_LAST_ENGINE_CLASS);
+	GEM_BUG_ON(guc_class == GUC_RESERVED_CLASS);
+
+	return guc_class;
+}
+
 /* Work item for submitting workloads into work queue of GuC. */
 struct guc_wq_item {
 	u32 header;