drm/i915/gt: Apply workaround 22016122933 correctly

WA_22016122933 was recently applied to all MeteorLake engines, which is
simultaneously too broad (should only apply to Media engines) and too
specific (should apply to all platforms that use the same media engine
as MeteorLake).  Correct this in cases where coherency settings are
modified.

There were also two additional places where the workaround was applied
unconditionally.  The change was confirmed as necessary for all
platforms, so the workaround label was removed.
Suggested-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Acked-by: Fei Yang <fei.yang@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230801153242.2445478-4-jonathan.cavitt@intel.com
Link: https://patchwork.freedesktop.org/patch/msgid/20230807121957.598420-4-andi.shyti@linux.intel.com

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

@@ -1009,9 +1009,10 @@ enum i915_map_type intel_gt_coherent_map_type(struct intel_gt *gt,
 					      bool always_coherent)
 {
 	/*
-	 * Wa_22016122933: always return I915_MAP_WC for MTL
+	 * Wa_22016122933: always return I915_MAP_WC for Media
+	 * version 13.0 when the object is on the Media GT
 	 */
-	if (i915_gem_object_is_lmem(obj) || IS_METEORLAKE(gt->i915))
+	if (i915_gem_object_is_lmem(obj) || intel_gt_needs_wa_22016122933(gt))
 		return I915_MAP_WC;
 	if (HAS_LLC(gt->i915) || always_coherent)
 		return I915_MAP_WB;

drivers/gpu/drm/i915/gt/intel_gt.h

@@ -6,6 +6,7 @@
 #ifndef __INTEL_GT__
 #define __INTEL_GT__
 
+#include "i915_drv.h"
 #include "intel_engine_types.h"
 #include "intel_gt_types.h"
 #include "intel_reset.h"
@@ -24,6 +25,11 @@ static inline bool gt_is_root(struct intel_gt *gt)
 	return !gt->info.id;
 }
 
+static inline bool intel_gt_needs_wa_22016122933(struct intel_gt *gt)
+{
+	return MEDIA_VER_FULL(gt->i915) == IP_VER(13, 0) && gt->type == GT_MEDIA;
+}
+
 static inline struct intel_gt *uc_to_gt(struct intel_uc *uc)
 {
 	return container_of(uc, struct intel_gt, uc);

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

@@ -1095,10 +1095,11 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
 	if (IS_ERR(obj)) {
 		obj = i915_gem_object_create_shmem(engine->i915, context_size);
 		/*
-		 * Wa_22016122933: For MTL the shared memory needs to be mapped
-		 * as WC on CPU side and UC (PAT index 2) on GPU side
+		 * Wa_22016122933: For Media version 13.0, all Media GT shared
+		 * memory needs to be mapped as WC on CPU side and UC (PAT
+		 * index 2) on GPU side.
 		 */
-		if (IS_METEORLAKE(engine->i915))
+		if (intel_gt_needs_wa_22016122933(engine->gt))
 			i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
 	}
 	if (IS_ERR(obj))

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

@@ -298,10 +298,6 @@ static int gsc_fw_load_prepare(struct intel_gsc_uc *gsc)
 	memcpy_toio(gsc->local_vaddr, src, gsc->fw.size);
 	memset_io(gsc->local_vaddr + gsc->fw.size, 0, gsc->local->size - gsc->fw.size);
 
-	/*
-	 * Wa_22016122933: Making sure the data in dst is
-	 * visible to GSC right away
-	 */
 	intel_guc_write_barrier(&gt->uc.guc);
 
 	i915_gem_object_unpin_map(gsc->fw.obj);

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

@@ -745,10 +745,11 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
 		return ERR_CAST(obj);
 
 	/*
-	 * Wa_22016122933: For MTL the shared memory needs to be mapped
-	 * as WC on CPU side and UC (PAT index 2) on GPU side
+	 * Wa_22016122933: For Media version 13.0, all Media GT shared
+	 * memory needs to be mapped as WC on CPU side and UC (PAT
+	 * index 2) on GPU side.
 	 */
-	if (IS_METEORLAKE(gt->i915))
+	if (intel_gt_needs_wa_22016122933(gt))
 		i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
 
 	vma = i915_vma_instance(obj, &gt->ggtt->vm, NULL);

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

@@ -960,10 +960,6 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg)
 	/* now update descriptor */
 	WRITE_ONCE(desc->head, head);
 
-	/*
-	 * Wa_22016122933: Making sure the head update is
-	 * visible to GuC right away
-	 */
 	intel_guc_write_barrier(ct_to_guc(ct));
 
 	return available - len;