[PATCH v2] drm/i915/gt: Add sysfs RAPL PL1 interface

[Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx>]

Adding sysfs attribute rapl_pl1_freq_mhz. This shows the RAPL PL1
FREQUENCY LIMIT.

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     |  4 ++++
 drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c | 15 +++++++++++++++
 drivers/gpu/drm/i915/gt/intel_rps.c         | 18 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_rps.h         |  1 +
 4 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 7fa18a3b3957..1c78fc89a37a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1656,6 +1656,10 @@
 #define GT0_PACKAGE_POWER_SKU_UNIT		_MMIO(0x250068)
 #define GT0_PLATFORM_ENERGY_STATUS		_MMIO(0x25006c)
 
+#define XEHPSDV_RAPL_PL1_FREQ_LIMIT		_MMIO(0x250070)
+#define MTL_RAPL_PL1_FREQ_LIMIT		_MMIO(0x281070)
+#define   RAPL_PL1_FREQ_LIMIT_MASK		REG_GENMASK(15, 0)
+
 /*
  * Standalone Media's non-engine GT registers are located at their regular GT
  * offsets plus 0x380000.  This extra offset is stored inside the intel_uncore
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
index 28f27091cd3b..0b52962e2856 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
@@ -451,6 +451,16 @@ static ssize_t punit_req_freq_mhz_show(struct kobject *kobj,
 	return sysfs_emit(buff, "%u\n", preq);
 }
 
+static ssize_t rapl_pl1_freq_mhz_show(struct kobject *kobj,
+				      struct kobj_attribute *attr,
+				      char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
+	u32 rapl_pl1 = intel_rps_read_rapl_pl1(&gt->rps);
+
+	return sysfs_emit(buff, "%u\n", rapl_pl1);
+}
+
 struct intel_gt_bool_throttle_attr {
 	struct attribute attr;
 	ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
@@ -480,6 +490,7 @@ struct intel_gt_bool_throttle_attr attr_##sysfs_func__ = { \
 }
 
 INTEL_GT_ATTR_RO(punit_req_freq_mhz);
+INTEL_GT_ATTR_RO(rapl_pl1_freq_mhz);
 static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_status, GT0_PERF_LIMIT_REASONS_MASK);
 static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_pl1, POWER_LIMIT_1_MASK);
 static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_pl2, POWER_LIMIT_2_MASK);
@@ -744,6 +755,10 @@ void intel_gt_sysfs_pm_init(struct intel_gt *gt, struct kobject *kobj)
 	if (ret)
 		gt_warn(gt, "failed to create punit_req_freq_mhz sysfs (%pe)", ERR_PTR(ret));
 
+	ret = sysfs_create_file(kobj, &attr_rapl_pl1_freq_mhz.attr);
+	if (ret)
+		gt_warn(gt, "failed to create rapl_pl1_freq_mhz sysfs (%pe)", ERR_PTR(ret));
+
 	if (i915_mmio_reg_valid(intel_gt_perf_limit_reasons_reg(gt))) {
 		ret = sysfs_create_files(kobj, throttle_reason_attrs);
 		if (ret)
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index f5d7b5126433..f66d6f47f2cf 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -2202,6 +2202,24 @@ u32 intel_rps_get_max_frequency(struct intel_rps *rps)
 		return intel_gpu_freq(rps, rps->max_freq_softlimit);
 }
 
+u32 intel_rps_read_rapl_pl1(struct intel_rps *rps)
+{
+	struct drm_i915_private *i915 = rps_to_i915(rps);
+	u32 rapl_pl1;
+	u32 rapl;
+
+	if (IS_METEORLAKE(i915))
+		rapl_pl1 = intel_uncore_read(rps_to_gt(rps)->uncore, MTL_RAPL_PL1_FREQ_LIMIT);
+	else if (IS_XEHPSDV(i915))
+		rapl_pl1  = intel_uncore_read(rps_to_gt(rps)->uncore, XEHPSDV_RAPL_PL1_FREQ_LIMIT);
+
+
+	if (IS_METEORLAKE(i915) || IS_XEHPSDV(i915))
+		rapl = REG_FIELD_GET(RAPL_PL1_FREQ_LIMIT_MASK, rapl_pl1);
+
+	return rapl;
+}
+
 /**
  * intel_rps_get_max_raw_freq - returns the max frequency in some raw format.
  * @rps: the intel_rps structure
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index c622962c6bef..c37d297c9d82 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -51,6 +51,7 @@ u32 intel_rps_get_rp1_frequency(struct intel_rps *rps);
 u32 intel_rps_get_rpn_frequency(struct intel_rps *rps);
 u32 intel_rps_read_punit_req(struct intel_rps *rps);
 u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
+u32 intel_rps_read_rapl_pl1(struct intel_rps *rps);
 u32 intel_rps_read_rpstat(struct intel_rps *rps);
 u32 intel_rps_read_rpstat_fw(struct intel_rps *rps);
 void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps);
-- 
2.34.1