drm/i915/xelpmp: Add multicast steering for media GT

MTL's media IP (Xe_LPM+) only has a single type of steering ("OAADDRM")
which selects between media slice 0 and media slice 1.  We'll always
steer to media slice 0 unless it is fused off (which is the case when
VD0, VE0, and SFC0 are all reported as unavailable).

Bspec: 67789
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221014230239.1023689-15-matthew.d.roper@intel.com

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

@@ -42,6 +42,7 @@ static const char * const intel_steering_types[] = {
 	"LNCF",
 	"GAM",
 	"DSS",
+	"OADDRM",
 	"INSTANCE 0",
 };
 
@@ -129,6 +130,11 @@ static const struct intel_mmio_range xelpg_dss_steering_table[] = {
 	{ 0x00DE80, 0x00E8FF },		/* DSS (0xE000-0xE0FF reserved) */
 };
 
+static const struct intel_mmio_range xelpmp_oaddrm_steering_table[] = {
+	{ 0x393200, 0x39323F },
+	{ 0x393400, 0x3934FF },
+};
+
 void intel_gt_mcr_init(struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
@@ -151,8 +157,9 @@ void intel_gt_mcr_init(struct intel_gt *gt)
 			drm_warn(&i915->drm, "mslice mask all zero!\n");
 	}
 
-	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70) &&
-	    gt->type == GT_PRIMARY) {
+	if (MEDIA_VER(i915) >= 13 && gt->type == GT_MEDIA) {
+		gt->steering_table[OADDRM] = xelpmp_oaddrm_steering_table;
+	} else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70)) {
 		fuse = REG_FIELD_GET(GT_L3_EXC_MASK,
 				     intel_uncore_read(gt->uncore, XEHP_FUSE4));
 
@@ -514,6 +521,13 @@ static void get_nonterminated_steering(struct intel_gt *gt,
 		*group = 0;
 		*instance = 0;
 		break;
+	case OADDRM:
+		if ((VDBOX_MASK(gt) | VEBOX_MASK(gt) | gt->info.sfc_mask) & BIT(0))
+			*group = 0;
+		else
+			*group = 1;
+		*instance = 0;
+		break;
 	default:
 		MISSING_CASE(type);
 		*group = 0;

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

@@ -61,6 +61,7 @@ enum intel_steering_type {
 	LNCF,
 	GAM,
 	DSS,
+	OADDRM,
 
 	/*
 	 * On some platforms there are multiple types of MCR registers that

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

@@ -1598,14 +1598,27 @@ xelpg_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
 	debug_dump_steering(gt);
 }
 
+static void
+xelpmp_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
+{
+	/* FIXME: Actual workarounds will be added in future patch(es) */
+
+	debug_dump_steering(gt);
+}
+
 static void
 gt_init_workarounds(struct intel_gt *gt, struct i915_wa_list *wal)
 {
 	struct drm_i915_private *i915 = gt->i915;
 
-	/* FIXME: Media GT handling will be added in an upcoming patch */
-	if (gt->type == GT_MEDIA)
+	if (gt->type == GT_MEDIA) {
+		if (MEDIA_VER(i915) >= 13)
+			xelpmp_gt_workarounds_init(gt, wal);
+		else
+			MISSING_CASE(MEDIA_VER(i915));
+
 		return;
+	}
 
 	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
 		xelpg_gt_workarounds_init(gt, wal);