[SRU][P:linux][PATCH v2 5/8] drm/xe/hwmon: Expose powerX_cap_interval

[Thibault Ferrante]

From: Karthik Poosa <karthik.poosa at intel.com>

BugLink: https://bugs.launchpad.net/bugs/2122435

Expose powerX_cap_interval to manage burst power limit time window.

Signed-off-by: Karthik Poosa <karthik.poosa at intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar at intel.com>
Link: https://lore.kernel.org/r/20250529163458.2354509-5-karthik.poosa@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
(cherry picked from commit 719d8a59595287557352893478f0c4e0df32b107)
Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu at intel.com>
Signed-off-by: Thibault Ferrante <thibault.ferrante at canonical.com>
---
 .../ABI/testing/sysfs-driver-intel-xe-hwmon    | 18 ++++++++++++++++++
 drivers/gpu/drm/xe/xe_hwmon.c                  | 16 +++++++++++++---
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
index 3ebb1d48e797..e9f72147e3dd 100644
--- a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
+++ b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
@@ -162,3 +162,21 @@ Description:	RW. Package burst (PL2) power limit in microwatts.
 		compared to PL1.
 
 		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_cap_interval
+Date:		May 2025
+KernelVersion:	6.15
+Contact:	intel-xe at lists.freedesktop.org
+Description:	RW. Card burst power limit interval (Tau in PL2/Tau) in
+		milliseconds over which sustained power is averaged.
+
+		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_cap_interval
+Date:		May 2025
+KernelVersion:	6.15
+Contact:	intel-xe at lists.freedesktop.org
+Description:	RW. Package burst power limit interval (Tau in PL2/Tau) in
+		milliseconds over which sustained power is averaged.
+
+		Only supported for particular Intel Xe graphics platforms.
diff --git a/drivers/gpu/drm/xe/xe_hwmon.c b/drivers/gpu/drm/xe/xe_hwmon.c
index 384981b74632..451cea26a443 100644
--- a/drivers/gpu/drm/xe/xe_hwmon.c
+++ b/drivers/gpu/drm/xe/xe_hwmon.c
@@ -458,7 +458,7 @@ xe_hwmon_power_max_interval_show(struct device *dev, struct device_attribute *at
 	u32 x, y, x_w = 2; /* 2 bits */
 	u64 r, tau4, out;
 	int channel = (to_sensor_dev_attr(attr)->index % 2) ? CHANNEL_PKG : CHANNEL_CARD;
-	u32 power_attr = PL1_HWMON_ATTR;
+	u32 power_attr = (to_sensor_dev_attr(attr)->index > 1) ? PL2_HWMON_ATTR : PL1_HWMON_ATTR;
 
 	int ret = 0;
 
@@ -513,7 +513,7 @@ xe_hwmon_power_max_interval_store(struct device *dev, struct device_attribute *a
 	u64 tau4, r, max_win;
 	unsigned long val;
 	int channel = (to_sensor_dev_attr(attr)->index % 2) ? CHANNEL_PKG : CHANNEL_CARD;
-	u32 power_attr = PL1_HWMON_ATTR;
+	u32 power_attr = (to_sensor_dev_attr(attr)->index > 1) ? PL2_HWMON_ATTR : PL1_HWMON_ATTR;
 	int ret;
 
 	ret = kstrtoul(buf, 0, &val);
@@ -591,10 +591,20 @@ static SENSOR_DEVICE_ATTR(power1_max_interval, 0664,
 static SENSOR_DEVICE_ATTR(power2_max_interval, 0664,
 			  xe_hwmon_power_max_interval_show,
 			  xe_hwmon_power_max_interval_store, SENSOR_INDEX_PKG_PL1);
+/* PSYS PL2 */
+static SENSOR_DEVICE_ATTR(power1_cap_interval, 0664,
+			  xe_hwmon_power_max_interval_show,
+			  xe_hwmon_power_max_interval_store, SENSOR_INDEX_PSYS_PL2);
+/* PKG PL2 */
+static SENSOR_DEVICE_ATTR(power2_cap_interval, 0664,
+			  xe_hwmon_power_max_interval_show,
+			  xe_hwmon_power_max_interval_store, SENSOR_INDEX_PKG_PL2);
 
 static struct attribute *hwmon_attributes[] = {
 	&sensor_dev_attr_power1_max_interval.dev_attr.attr,
 	&sensor_dev_attr_power2_max_interval.dev_attr.attr,
+	&sensor_dev_attr_power1_cap_interval.dev_attr.attr,
+	&sensor_dev_attr_power2_cap_interval.dev_attr.attr,
 	NULL
 };
 
@@ -605,7 +615,7 @@ static umode_t xe_hwmon_attributes_visible(struct kobject *kobj,
 	struct xe_hwmon *hwmon = dev_get_drvdata(dev);
 	int ret = 0;
 	int channel = (index % 2) ? CHANNEL_PKG : CHANNEL_CARD;
-	u32 power_attr = PL1_HWMON_ATTR;
+	u32 power_attr = (index > 1) ? PL2_HWMON_ATTR : PL1_HWMON_ATTR;
 	u32 uval;
 
 	xe_pm_runtime_get(hwmon->xe);
-- 
2.48.1