drm/xe: Introduce the RPa information

RPa is the Achievable frequency, defined by PCODE at runtime
based on multiple running conditions.

v2: Remove RPA_MASK from i915 file

Cc: Vinay Belgaumkar <[email protected]>
Reviewed-by: Jonathan Cavitt <[email protected]>
Reviewed-by: Vinay Belgaumkar <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: rodrigovivi

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

@@ -44,12 +44,16 @@
 
 #define MTL_RP_STATE_CAP			XE_REG(0x138000)
 
+#define MTL_GT_RPA_FREQUENCY			XE_REG(0x138008)
 #define MTL_GT_RPE_FREQUENCY			XE_REG(0x13800c)
 
 #define MTL_MEDIAP_STATE_CAP			XE_REG(0x138020)
 #define   MTL_RPN_CAP_MASK			REG_GENMASK(24, 16)
 #define   MTL_RP0_CAP_MASK			REG_GENMASK(8, 0)
 
+#define MTL_MPA_FREQUENCY			XE_REG(0x138028)
+#define   MTL_RPA_MASK				REG_GENMASK(8, 0)
+
 #define MTL_MPE_FREQUENCY			XE_REG(0x13802c)
 #define   MTL_RPE_MASK				REG_GENMASK(8, 0)
 

drivers/gpu/drm/xe/xe_gt_freq.c

@@ -115,6 +115,20 @@ static ssize_t rpe_freq_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(rpe_freq);
 
+static ssize_t rpa_freq_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct xe_guc_pc *pc = dev_to_pc(dev);
+	u32 freq;
+
+	xe_pm_runtime_get(dev_to_xe(dev));
+	freq = xe_guc_pc_get_rpa_freq(pc);
+	xe_pm_runtime_put(dev_to_xe(dev));
+
+	return sysfs_emit(buf, "%d\n", freq);
+}
+static DEVICE_ATTR_RO(rpa_freq);
+
 static ssize_t rpn_freq_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
@@ -202,6 +216,7 @@ static const struct attribute *freq_attrs[] = {
 	&dev_attr_act_freq.attr,
 	&dev_attr_cur_freq.attr,
 	&dev_attr_rp0_freq.attr,
+	&dev_attr_rpa_freq.attr,
 	&dev_attr_rpe_freq.attr,
 	&dev_attr_rpn_freq.attr,
 	&dev_attr_min_freq.attr,

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -38,6 +38,7 @@
 
 #define FREQ_INFO_REC	XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x5ef0)
 #define   RPE_MASK		REG_GENMASK(15, 8)
+#define   RPA_MASK		REG_GENMASK(31, 16)
 
 #define GT_PERF_STATUS		XE_REG(0x1381b4)
 #define   CAGF_MASK	REG_GENMASK(19, 11)
@@ -328,6 +329,19 @@ static int pc_set_max_freq(struct xe_guc_pc *pc, u32 freq)
 				   freq);
 }
 
+static void mtl_update_rpa_value(struct xe_guc_pc *pc)
+{
+	struct xe_gt *gt = pc_to_gt(pc);
+	u32 reg;
+
+	if (xe_gt_is_media_type(gt))
+		reg = xe_mmio_read32(&gt->mmio, MTL_MPA_FREQUENCY);
+	else
+		reg = xe_mmio_read32(&gt->mmio, MTL_GT_RPA_FREQUENCY);
+
+	pc->rpa_freq = decode_freq(REG_FIELD_GET(MTL_RPA_MASK, reg));
+}
+
 static void mtl_update_rpe_value(struct xe_guc_pc *pc)
 {
 	struct xe_gt *gt = pc_to_gt(pc);
@@ -341,6 +355,25 @@ static void mtl_update_rpe_value(struct xe_guc_pc *pc)
 	pc->rpe_freq = decode_freq(REG_FIELD_GET(MTL_RPE_MASK, reg));
 }
 
+static void tgl_update_rpa_value(struct xe_guc_pc *pc)
+{
+	struct xe_gt *gt = pc_to_gt(pc);
+	struct xe_device *xe = gt_to_xe(gt);
+	u32 reg;
+
+	/*
+	 * For PVC we still need to use fused RP1 as the approximation for RPe
+	 * For other platforms than PVC we get the resolved RPe directly from
+	 * PCODE at a different register
+	 */
+	if (xe->info.platform == XE_PVC)
+		reg = xe_mmio_read32(&gt->mmio, PVC_RP_STATE_CAP);
+	else
+		reg = xe_mmio_read32(&gt->mmio, FREQ_INFO_REC);
+
+	pc->rpa_freq = REG_FIELD_GET(RPA_MASK, reg) * GT_FREQUENCY_MULTIPLIER;
+}
+
 static void tgl_update_rpe_value(struct xe_guc_pc *pc)
 {
 	struct xe_gt *gt = pc_to_gt(pc);
@@ -365,10 +398,13 @@ static void pc_update_rp_values(struct xe_guc_pc *pc)
 	struct xe_gt *gt = pc_to_gt(pc);
 	struct xe_device *xe = gt_to_xe(gt);
 
-	if (GRAPHICS_VERx100(xe) >= 1270)
+	if (GRAPHICS_VERx100(xe) >= 1270) {
+		mtl_update_rpa_value(pc);
 		mtl_update_rpe_value(pc);
-	else
+	} else {
+		tgl_update_rpa_value(pc);
 		tgl_update_rpe_value(pc);
+	}
 
 	/*
 	 * RPe is decided at runtime by PCODE. In the rare case where that's
@@ -447,6 +483,19 @@ u32 xe_guc_pc_get_rp0_freq(struct xe_guc_pc *pc)
 	return pc->rp0_freq;
 }
 
+/**
+ * xe_guc_pc_get_rpa_freq - Get the RPa freq
+ * @pc: The GuC PC
+ *
+ * Returns: RPa freq.
+ */
+u32 xe_guc_pc_get_rpa_freq(struct xe_guc_pc *pc)
+{
+	pc_update_rp_values(pc);
+
+	return pc->rpa_freq;
+}
+
 /**
  * xe_guc_pc_get_rpe_freq - Get the RPe freq
  * @pc: The GuC PC

drivers/gpu/drm/xe/xe_guc_pc.h

@@ -21,6 +21,7 @@ int xe_guc_pc_unset_gucrc_mode(struct xe_guc_pc *pc);
 u32 xe_guc_pc_get_act_freq(struct xe_guc_pc *pc);
 int xe_guc_pc_get_cur_freq(struct xe_guc_pc *pc, u32 *freq);
 u32 xe_guc_pc_get_rp0_freq(struct xe_guc_pc *pc);
+u32 xe_guc_pc_get_rpa_freq(struct xe_guc_pc *pc);
 u32 xe_guc_pc_get_rpe_freq(struct xe_guc_pc *pc);
 u32 xe_guc_pc_get_rpn_freq(struct xe_guc_pc *pc);
 int xe_guc_pc_get_min_freq(struct xe_guc_pc *pc, u32 *freq);

drivers/gpu/drm/xe/xe_guc_pc_types.h

@@ -17,6 +17,8 @@ struct xe_guc_pc {
 	struct xe_bo *bo;
 	/** @rp0_freq: HW RP0 frequency - The Maximum one */
 	u32 rp0_freq;
+	/** @rpa_freq: HW RPa frequency - The Achievable one */
+	u32 rpa_freq;
 	/** @rpe_freq: HW RPe frequency - The Efficient one */
 	u32 rpe_freq;
 	/** @rpn_freq: HW RPN frequency - The Minimum one */