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From:   Gabriel C <nix.or.die@gmail.com>
Date:   Sun, 29 Apr 2018 18:13:04 +0200
Message-ID: <CAEJqkggcXnTWwNvidc=qG5fWFu8Q-6uGtrapi88e5t3u7wD12Q@mail.gmail.com>
Subject: Re: [PATCH 2/2] hwmon: (k10temp) Display both Tctl and Tdie
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Clemens Ladisch <clemens@ladisch.de>,
        Jean Delvare <jdelvare@suse.com>, linux-hwmon@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Brian Woods <brian.woods@amd.com>
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Sender: linux-kernel-owner@vger.kernel.org
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2018-04-27 5:13 GMT+02:00 Guenter Roeck <linux@roeck-us.net>:
> On some AMD CPUs, there is a different between the die temperature
> (Tdie) and the reported temperature (Tctl). Tdie is the real measured
> temperature, and Tctl is used for fan control. Lets report both for
> affected CPUs.
>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  drivers/hwmon/k10temp.c | 55 ++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 48 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index b06bb1f90853..1135b8f1ad0f 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -80,6 +80,7 @@ struct k10temp_data {
>         void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>         int temp_offset;
>         u32 temp_adjust_mask;
> +       bool show_tdie;
>  };
>
>  struct tctl_offset {
> @@ -140,17 +141,24 @@ static void read_tempreg_nb_f17(struct pci_dev *pdev, u32 *regval)
>                           F17H_M01H_REPORTED_TEMP_CTRL_OFFSET, regval);
>  }
>
> -static ssize_t temp1_input_show(struct device *dev,
> -                               struct device_attribute *attr, char *buf)
> +unsigned int get_raw_temp(struct k10temp_data *data)
>  {
> -       struct k10temp_data *data = dev_get_drvdata(dev);
> -       u32 regval;
>         unsigned int temp;
> +       u32 regval;
>
>         data->read_tempreg(data->pdev, &regval);
>         temp = (regval >> 21) * 125;
>         if (regval & data->temp_adjust_mask)
>                 temp -= 49000;
> +       return temp;
> +}
> +
> +static ssize_t temp1_input_show(struct device *dev,
> +                               struct device_attribute *attr, char *buf)
> +{
> +       struct k10temp_data *data = dev_get_drvdata(dev);
> +       unsigned int temp = get_raw_temp(data);
> +
>         if (temp > data->temp_offset)
>                 temp -= data->temp_offset;
>         else
> @@ -159,6 +167,23 @@ static ssize_t temp1_input_show(struct device *dev,
>         return sprintf(buf, "%u\n", temp);
>  }
>
> +static ssize_t temp2_input_show(struct device *dev,
> +                               struct device_attribute *devattr, char *buf)
> +{
> +       struct k10temp_data *data = dev_get_drvdata(dev);
> +       unsigned int temp = get_raw_temp(data);
> +
> +       return sprintf(buf, "%u\n", temp);
> +}
> +
> +static ssize_t temp_label_show(struct device *dev,
> +                              struct device_attribute *devattr, char *buf)
> +{
> +       struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +
> +       return sprintf(buf, "%s\n", attr->index ? "Tctl" : "Tdie");
> +}
> +
>  static ssize_t temp1_max_show(struct device *dev,
>                               struct device_attribute *attr, char *buf)
>  {
> @@ -187,16 +212,23 @@ static DEVICE_ATTR_RO(temp1_max);
>  static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
>  static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
>
> +static SENSOR_DEVICE_ATTR(temp1_label, 0444, temp_label_show, NULL, 0);
> +static DEVICE_ATTR_RO(temp2_input);
> +static SENSOR_DEVICE_ATTR(temp2_label, 0444, temp_label_show, NULL, 1);
> +
>  static umode_t k10temp_is_visible(struct kobject *kobj,
>                                   struct attribute *attr, int index)
>  {
>         struct device *dev = container_of(kobj, struct device, kobj);
>         struct k10temp_data *data = dev_get_drvdata(dev);
>         struct pci_dev *pdev = data->pdev;
> +       u32 reg;
>
> -       if (index >= 2) {
> -               u32 reg;
> -
> +       switch (index) {
> +       case 0 ... 1:   /* temp1_input, temp1_max */
> +       default:
> +               break;
> +       case 2 ... 3:   /* temp1_crit, temp1_crit_hyst */
>                 if (!data->read_htcreg)
>                         return 0;
>
> @@ -208,6 +240,11 @@ static umode_t k10temp_is_visible(struct kobject *kobj,
>                 data->read_htcreg(data->pdev, &reg);
>                 if (!(reg & HTC_ENABLE))
>                         return 0;
> +               break;
> +       case 4 ... 6:   /* temp1_label, temp2_input, temp2_label */
> +               if (!data->show_tdie)
> +                       return 0;
> +               break;
>         }
>         return attr->mode;
>  }
> @@ -217,6 +254,9 @@ static struct attribute *k10temp_attrs[] = {
>         &dev_attr_temp1_max.attr,
>         &sensor_dev_attr_temp1_crit.dev_attr.attr,
>         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
> +       &sensor_dev_attr_temp1_label.dev_attr.attr,
> +       &dev_attr_temp2_input.attr,
> +       &sensor_dev_attr_temp2_label.dev_attr.attr,
>         NULL
>  };
>
> @@ -292,6 +332,7 @@ static int k10temp_probe(struct pci_dev *pdev,
>         } else if (boot_cpu_data.x86 == 0x17) {
>                 data->temp_adjust_mask = 0x80000;
>                 data->read_tempreg = read_tempreg_nb_f17;
> +               data->show_tdie = true;
>         } else {
>                 data->read_htcreg = read_htcreg_pci;
>                 data->read_tempreg = read_tempreg_pci;
> --
> 2.7.4
>

On my EPYC box Tdie and Tctl seems to have the same value.
However the code is working fine and both values are displayed now.

Tested-by: Gabriel Craciunescu <nix.or.die@gmail.com>

Regards