[PATCH v3 4/5] drm/xe/hwmon: Expose powerX_cap_interval

[Nilawar, Badal]

On 01-05-2025 02:06, Karthik Poosa wrote:
> Expose powerX_cap_interval to manage burst power limit time window.
>
> Signed-off-by: Karthik Poosa <karthik.poosa at intel.com>

Looks good to me.
Reviewed-by: Badal Nilawar <badal.nilawar at intel.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 9dc2ee348aa6..124fa0883924 100644
> --- a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
> +++ b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
> @@ -176,3 +176,21 @@ Description:	RW. Package burst (PL2) power limit in microwatts.
>   		limit. Writing values > 0 and <= TDP will enable the power limit.
>   
>   		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 115758c88175..ada8c15829a3 100644
> --- a/drivers/gpu/drm/xe/xe_hwmon.c
> +++ b/drivers/gpu/drm/xe/xe_hwmon.c
> @@ -473,7 +473,7 @@ 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;
>   
> @@ -528,7 +528,7 @@ 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);
> @@ -612,10 +612,20 @@ 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
>   };
>   
> @@ -626,7 +636,7 @@ 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);