[PATCH v5 7/7] drm/i915/gt: Adding new sysfs frequency attributes

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

From: Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx>

This patch adds the following new sysfs frequency attributes;
	- punit_req_freq_mhz
	- throttle_reason_status
	- throttle_reason_pl1
	- throttle_reason_pl2
	- throttle_reason_pl4
	- throttle_reason_thermal
	- throttle_reason_prochot
	- throttle_reason_ratl
	- throttle_reason_vr_thermalert
	- throttle_reason_vr_tdc

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Dale B Stimson <dale.b.stimson@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c | 142 ++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_rps.c         |  83 ++++++++++++
 drivers/gpu/drm/i915/gt/intel_rps.h         |  10 ++
 drivers/gpu/drm/i915/i915_reg.h             |  11 ++
 4 files changed, 246 insertions(+)

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 8e86b8f675f1..8be676cd1607 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
@@ -463,6 +463,141 @@ static ssize_t rps_rp_mhz_show(struct device *dev,
 static const struct attribute * const gen6_rps_attrs[] = GEN6_RPS_ATTR;
 static const struct attribute * const gen6_gt_attrs[]  = GEN6_GT_ATTR;
 
+static ssize_t punit_req_freq_mhz_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	u32 preq = intel_rps_read_punit_req_frequency(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%d\n", preq);
+}
+
+static ssize_t throttle_reason_status_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool status = !!intel_rps_read_throttle_reason_status(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", status);
+}
+
+static ssize_t throttle_reason_pl1_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool pl1 = !!intel_rps_read_throttle_reason_pl1(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", pl1);
+}
+
+static ssize_t throttle_reason_pl2_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool pl2 = !!intel_rps_read_throttle_reason_pl2(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", pl2);
+}
+
+static ssize_t throttle_reason_pl4_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool pl4 = !!intel_rps_read_throttle_reason_pl4(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", pl4);
+}
+
+static ssize_t throttle_reason_thermal_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool thermal = !!intel_rps_read_throttle_reason_thermal(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", thermal);
+}
+
+static ssize_t throttle_reason_prochot_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool prochot = !!intel_rps_read_throttle_reason_prochot(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", prochot);
+}
+
+static ssize_t throttle_reason_ratl_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool ratl = !!intel_rps_read_throttle_reason_ratl(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", ratl);
+}
+
+static ssize_t throttle_reason_vr_thermalert_show(struct device *dev,
+						  struct device_attribute *attr,
+						  char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool thermalert = !!intel_rps_read_throttle_reason_vr_thermalert(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", thermalert);
+}
+
+static ssize_t throttle_reason_vr_tdc_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buff)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
+	struct intel_rps *rps = &gt->rps;
+	bool tdc = !!intel_rps_read_throttle_reason_vr_tdc(rps);
+
+	return scnprintf(buff, PAGE_SIZE, "%u\n", tdc);
+}
+
+static DEVICE_ATTR_RO(punit_req_freq_mhz);
+static DEVICE_ATTR_RO(throttle_reason_status);
+static DEVICE_ATTR_RO(throttle_reason_pl1);
+static DEVICE_ATTR_RO(throttle_reason_pl2);
+static DEVICE_ATTR_RO(throttle_reason_pl4);
+static DEVICE_ATTR_RO(throttle_reason_thermal);
+static DEVICE_ATTR_RO(throttle_reason_prochot);
+static DEVICE_ATTR_RO(throttle_reason_ratl);
+static DEVICE_ATTR_RO(throttle_reason_vr_thermalert);
+static DEVICE_ATTR_RO(throttle_reason_vr_tdc);
+
+static const struct attribute *freq_attrs[] = {
+	&dev_attr_punit_req_freq_mhz.attr,
+	&dev_attr_throttle_reason_status.attr,
+	&dev_attr_throttle_reason_pl1.attr,
+	&dev_attr_throttle_reason_pl2.attr,
+	&dev_attr_throttle_reason_pl4.attr,
+	&dev_attr_throttle_reason_thermal.attr,
+	&dev_attr_throttle_reason_prochot.attr,
+	&dev_attr_throttle_reason_ratl.attr,
+	&dev_attr_throttle_reason_vr_thermalert.attr,
+	&dev_attr_throttle_reason_vr_tdc.attr,
+	NULL
+};
+
 static int intel_sysfs_rps_init(struct intel_gt *gt, struct kobject *kobj,
 				const struct attribute * const *attrs)
 {
@@ -493,4 +628,11 @@ void intel_gt_sysfs_pm_init(struct intel_gt *gt, struct kobject *kobj)
 	if (ret)
 		drm_warn(&gt->i915->drm,
 			 "failed to create gt%u RPS sysfs files", gt->info.id);
+
+	ret = sysfs_create_files(kobj, freq_attrs);
+	if (ret)
+		drm_warn(&gt->i915->drm,
+			 "failed to create gt%u throttle sysfs files",
+			 gt->info.id);
+
 }
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index fd95449ed46d..94c78cfaf9c9 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -2286,6 +2286,89 @@ void intel_rps_lower_unslice(struct intel_rps *rps)
 	mutex_unlock(&rps->lock);
 }
 
+static u32 __rps_read_mmio(struct intel_gt *gt, i915_reg_t reg32)
+{
+	intel_wakeref_t wakeref;
+	u32 val;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		val = intel_uncore_read(gt->uncore, reg32);
+
+	return val;
+}
+
+u32 intel_rps_read_throttle_reason_status(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 status = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & GT0_PERF_LIMIT_REASONS_MASK;
+
+	return status;
+}
+
+u32 intel_rps_read_throttle_reason_pl1(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 pl1 = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & POWER_LIMIT_1_MASK;
+
+	return pl1;
+}
+
+u32 intel_rps_read_throttle_reason_pl2(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 pl2 = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & POWER_LIMIT_2_MASK;
+
+	return pl2;
+}
+
+u32 intel_rps_read_throttle_reason_pl4(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 pl4 = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & POWER_LIMIT_4_MASK;
+
+	return pl4;
+}
+
+u32 intel_rps_read_throttle_reason_thermal(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 thermal = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & THERMAL_LIMIT_MASK;
+
+	return thermal;
+}
+
+u32 intel_rps_read_throttle_reason_prochot(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 prochot = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & PROCHOT_MASK;
+
+	return prochot;
+}
+
+u32 intel_rps_read_throttle_reason_ratl(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 ratl = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & RATL_MASK;
+
+	return ratl;
+}
+
+u32 intel_rps_read_throttle_reason_vr_thermalert(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 thermalert = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & VR_THERMALERT_MASK;
+
+	return thermalert;
+}
+
+u32 intel_rps_read_throttle_reason_vr_tdc(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+	u32 tdc = __rps_read_mmio(gt, GT0_PERF_LIMIT_REASONS) & VR_TDC_MASK;
+
+	return tdc;
+}
+
 /* External interface for intel_ips.ko */
 
 static struct drm_i915_private __rcu *ips_mchdev;
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index c6d76a3d1331..b45ab983895c 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -47,6 +47,16 @@ u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
 u32 intel_rps_read_state_cap(struct intel_rps *rps);
 void intel_rps_raise_unslice(struct intel_rps *rps);
 void intel_rps_lower_unslice(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_status(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_pl1(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_pl2(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_pl4(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_thermal(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_prochot(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_ratl(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_vr_thermalert(struct intel_rps *rps);
+u32 intel_rps_read_throttle_reason_vr_tdc(struct intel_rps *rps);
 
 void gen5_rps_irq_handler(struct intel_rps *rps);
 void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2243d9d1d941..c4f53e5404cd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1836,6 +1836,17 @@
 #define GEN9_RP_STATE_LIMITS	_MMIO(0x138148)
 #define XEHPSDV_RP_STATE_CAP	_MMIO(0x250014)
 
+#define GT0_PERF_LIMIT_REASONS		_MMIO(0x1381A8)
+#define   GT0_PERF_LIMIT_REASONS_MASK	0x00000de3
+#define   PROCHOT_MASK			BIT(1)
+#define   THERMAL_LIMIT_MASK		BIT(2)
+#define   RATL_MASK			BIT(6)
+#define   VR_THERMALERT_MASK		BIT(7)
+#define   VR_TDC_MASK			BIT(8)
+#define   POWER_LIMIT_4_MASK		BIT(9)
+#define   POWER_LIMIT_1_MASK		BIT(11)
+#define   POWER_LIMIT_2_MASK		BIT(12)
+
 #define CHV_CLK_CTL1			_MMIO(0x101100)
 #define VLV_CLK_CTL2			_MMIO(0x101104)
 #define   CLK_CTL2_CZCOUNT_30NS_SHIFT	28
-- 
2.27.0