drm/xe/mtl: Add support to get C6 residency/status of MTL

Add the registers to get C6 residency of MTL SAMedia and
C6 status of MTL gts

v2:
   - move register definitions to regs header (Anshuman)
   - correct reg definition for mtl rc status
   - make idle_status function common (Badal)

v3:
   - remove extra line in commit message
   - use only media type check in initialization
   - use graphics ver check (Anshuman)

v4:
   - remove extra lines (Anshuman)

Bspec: 66300
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -16,6 +16,11 @@
 #define MEDIA_GT_GSI_OFFSET				0x380000
 #define MEDIA_GT_GSI_LENGTH				0x40000
 
+/* MTL workpoint reg to get core C state and actual freq of 3D, SAMedia */
+#define MTL_MIRROR_TARGET_WP1				XE_REG(0xc60)
+#define   MTL_CAGF_MASK					REG_GENMASK(8, 0)
+#define   MTL_CC_MASK					REG_GENMASK(12, 9)
+
 /* RPM unit config (Gen8+) */
 #define RPM_CONFIG0					XE_REG(0xd00)
 #define   RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_MASK		REG_GENMASK(5, 3)
@@ -349,10 +354,12 @@
 #define   FORCEWAKE_USER			BIT(1)
 #define   FORCEWAKE_KERNEL_FALLBACK		BIT(15)
 
+#define MTL_MEDIA_MC6				XE_REG(0x138048)
+
 #define GT_CORE_STATUS				XE_REG(0x138060)
 #define   RCN_MASK				REG_GENMASK(2, 0)
-#define   GT_RC0				0
-#define   GT_RC6				3
+#define   GT_C0					0
+#define   GT_C6					3
 
 #define GT_GFX_RC6_LOCKED			XE_REG(0x138104)
 #define GT_GFX_RC6				XE_REG(0x138108)

drivers/gpu/drm/xe/xe_gt_idle_sysfs.c

@@ -142,11 +142,17 @@ void xe_gt_idle_sysfs_init(struct xe_gt_idle *gtidle)
 		return;
 	}
 
-	sprintf(gtidle->name, "gt%d-rc\n", gt->info.id);
-	/* Multiplier for  RC6 Residency counter in units of 1.28us */
+	if (xe_gt_is_media_type(gt)) {
+		sprintf(gtidle->name, "gt%d-mc\n", gt->info.id);
+		gtidle->idle_residency = xe_guc_pc_mc6_residency;
+	} else {
+		sprintf(gtidle->name, "gt%d-rc\n", gt->info.id);
+		gtidle->idle_residency = xe_guc_pc_rc6_residency;
+	}
+
+	/* Multiplier for Residency counter in units of 1.28us */
 	gtidle->residency_multiplier = 1280;
-	gtidle->idle_residency = xe_guc_pc_rc6_residency;
-	gtidle->idle_status = xe_guc_pc_rc_status;
+	gtidle->idle_status = xe_guc_pc_c_status;
 
 	err = sysfs_create_files(kobj, gt_idle_attrs);
 	if (err) {

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -34,9 +34,6 @@
 #define GT_PERF_STATUS		XE_REG(0x1381b4)
 #define   GEN12_CAGF_MASK	REG_GENMASK(19, 11)
 
-#define MTL_MIRROR_TARGET_WP1	XE_REG(0xc60)
-#define   MTL_CAGF_MASK		REG_GENMASK(8, 0)
-
 #define GT_FREQUENCY_MULTIPLIER	50
 #define GEN9_FREQ_SCALER	3
 
@@ -568,22 +565,30 @@ static ssize_t freq_max_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR_RW(freq_max);
 
 /**
- * xe_guc_pc_rc_status - get the current Render C state
+ * xe_guc_pc_c_status - get the current GT C state
  * @pc: XE_GuC_PC instance
  */
-enum xe_gt_idle_state xe_guc_pc_rc_status(struct xe_guc_pc *pc)
+enum xe_gt_idle_state xe_guc_pc_c_status(struct xe_guc_pc *pc)
 {
 	struct xe_gt *gt = pc_to_gt(pc);
-	u32 reg;
+	u32 reg, gt_c_state;
 
 	xe_device_mem_access_get(gt_to_xe(gt));
-	reg = xe_mmio_read32(gt, GT_CORE_STATUS);
+
+	if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1270) {
+		reg = xe_mmio_read32(gt, MTL_MIRROR_TARGET_WP1);
+		gt_c_state = REG_FIELD_GET(MTL_CC_MASK, reg);
+	} else {
+		reg = xe_mmio_read32(gt, GT_CORE_STATUS);
+		gt_c_state = REG_FIELD_GET(RCN_MASK, reg);
+	}
+
 	xe_device_mem_access_put(gt_to_xe(gt));
 
-	switch (REG_FIELD_GET(RCN_MASK, reg)) {
-	case GT_RC6:
+	switch (gt_c_state) {
+	case GT_C6:
 		return GT_IDLE_C6;
-	case GT_RC0:
+	case GT_C0:
 		return GT_IDLE_C0;
 	default:
 		return GT_IDLE_UNKNOWN;
@@ -606,6 +611,22 @@ u64 xe_guc_pc_rc6_residency(struct xe_guc_pc *pc)
 	return reg;
 }
 
+/**
+ * xe_guc_pc_mc6_residency - mc6 residency counter
+ * @pc: Xe_GuC_PC instance
+ */
+u64 xe_guc_pc_mc6_residency(struct xe_guc_pc *pc)
+{
+	struct xe_gt *gt = pc_to_gt(pc);
+	u64 reg;
+
+	xe_device_mem_access_get(gt_to_xe(gt));
+	reg = xe_mmio_read32(gt, MTL_MEDIA_MC6);
+	xe_device_mem_access_put(gt_to_xe(gt));
+
+	return reg;
+}
+
 static const struct attribute *pc_attrs[] = {
 	&dev_attr_freq_act.attr,
 	&dev_attr_freq_cur.attr,

drivers/gpu/drm/xe/xe_guc_pc.h

@@ -12,6 +12,7 @@ int xe_guc_pc_init(struct xe_guc_pc *pc);
 int xe_guc_pc_start(struct xe_guc_pc *pc);
 int xe_guc_pc_stop(struct xe_guc_pc *pc);
 
-enum xe_gt_idle_state xe_guc_pc_rc_status(struct xe_guc_pc *pc);
+enum xe_gt_idle_state xe_guc_pc_c_status(struct xe_guc_pc *pc);
 u64 xe_guc_pc_rc6_residency(struct xe_guc_pc *pc);
+u64 xe_guc_pc_mc6_residency(struct xe_guc_pc *pc);
 #endif /* _XE_GUC_PC_H_ */