linux-kernel - Re: [PATCH 3/4] hwmon: (occ) Add sysfs entries for additional extended status bits

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Message-ID: <CACPK8XeTJU0E6LCmEMhvebXTh23+3PHfbCoHsn_0fH9d0=rDZg@mail.gmail.com>
Date:   Wed, 16 Feb 2022 06:12:07 +0000
From:   Joel Stanley <joel@....id.au>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-hwmon@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 3/4] hwmon: (occ) Add sysfs entries for additional
 extended status bits

On Tue, 15 Feb 2022 at 15:11, Eddie James <eajames@...ux.ibm.com> wrote:
>
> Add sysfs entries for DVFS due to a VRM Vdd over-temperature condition,
> and add the GPU throttling condition bits (such that if bit 1 is set,
> GPU1 is throttling).
>
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Reviewed-by: Joel Stanley <joel@....id.au>

> ---
>  drivers/hwmon/occ/sysfs.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c
> index 88f655887c95..b2f788a77746 100644
> --- a/drivers/hwmon/occ/sysfs.c
> +++ b/drivers/hwmon/occ/sysfs.c
> @@ -19,6 +19,8 @@
>  #define OCC_EXT_STAT_DVFS_POWER                BIT(6)
>  #define OCC_EXT_STAT_MEM_THROTTLE      BIT(5)
>  #define OCC_EXT_STAT_QUICK_DROP                BIT(4)
> +#define OCC_EXT_STAT_DVFS_VDD          BIT(3)
> +#define OCC_EXT_STAT_GPU_THROTTLE      GENMASK(2, 0)
>
>  static ssize_t occ_sysfs_show(struct device *dev,
>                               struct device_attribute *attr, char *buf)
> @@ -69,6 +71,12 @@ static ssize_t occ_sysfs_show(struct device *dev,
>         case 9:
>                 val = header->mode;
>                 break;
> +       case 10:
> +               val = !!(header->ext_status & OCC_EXT_STAT_DVFS_VDD);
> +               break;
> +       case 11:
> +               val = header->ext_status & OCC_EXT_STAT_GPU_THROTTLE;
> +               break;
>         default:
>                 return -EINVAL;
>         }
> @@ -96,6 +104,8 @@ static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
>  static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
>  static SENSOR_DEVICE_ATTR(occ_ips_status, 0444, occ_sysfs_show, NULL, 8);
>  static SENSOR_DEVICE_ATTR(occ_mode, 0444, occ_sysfs_show, NULL, 9);
> +static SENSOR_DEVICE_ATTR(occ_dvfs_vdd, 0444, occ_sysfs_show, NULL, 10);
> +static SENSOR_DEVICE_ATTR(occ_gpu_throttle, 0444, occ_sysfs_show, NULL, 11);
>  static DEVICE_ATTR_RO(occ_error);
>
>  static struct attribute *occ_attributes[] = {
> @@ -109,6 +119,8 @@ static struct attribute *occ_attributes[] = {
>         &sensor_dev_attr_occs_present.dev_attr.attr,
>         &sensor_dev_attr_occ_ips_status.dev_attr.attr,
>         &sensor_dev_attr_occ_mode.dev_attr.attr,
> +       &sensor_dev_attr_occ_dvfs_vdd.dev_attr.attr,
> +       &sensor_dev_attr_occ_gpu_throttle.dev_attr.attr,
>         &dev_attr_occ_error.attr,
>         NULL
>  };
> @@ -166,6 +178,18 @@ void occ_sysfs_poll_done(struct occ *occ)
>                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
>         }
>
> +       if ((header->ext_status & OCC_EXT_STAT_DVFS_VDD) !=
> +           (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_VDD)) {
> +               name = sensor_dev_attr_occ_dvfs_vdd.dev_attr.attr.name;
> +               sysfs_notify(&occ->bus_dev->kobj, NULL, name);
> +       }
> +
> +       if ((header->ext_status & OCC_EXT_STAT_GPU_THROTTLE) !=
> +           (occ->prev_ext_stat & OCC_EXT_STAT_GPU_THROTTLE)) {
> +               name = sensor_dev_attr_occ_gpu_throttle.dev_attr.attr.name;
> +               sysfs_notify(&occ->bus_dev->kobj, NULL, name);
> +       }
> +
>         if ((header->status & OCC_STAT_MASTER) &&
>             header->occs_present != occ->prev_occs_present) {
>                 name = sensor_dev_attr_occs_present.dev_attr.attr.name;
> --
> 2.27.0
>