[Intel-gfx] [PATCH 4/7] drm/i915/hwmon: Show device level energy usage

[Dixit, Ashutosh]

On Thu, 25 Aug 2022 06:21:15 -0700, Badal Nilawar wrote:
>
> From: Dale B Stimson <dale.b.stimson at intel.com>
>
> Use i915 HWMON to display device level energy input.
>
> v2:
>   - Updated the date and kernel version in feature description

A few things to delete below but since no other changes this is:

Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>

> diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon
> index 9a2d10edfce8..03d71c6869d3 100644
> --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon
> +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon
> @@ -25,3 +25,11 @@ Contact:	dri-devel at lists.freedesktop.org
>  Description:	RO. Card default power limit (default TDP setting).
>
>		Only supported for particular Intel i915 graphics platforms.
> +
> +What:		/sys/devices/.../hwmon/hwmon<i>/energy1_input
> +Date:		June 2022
> +KernelVersion:	5.19

Need to update kernel version on all patches now at least to 6.0 if not
6.1.

> +static int
> +hwm_energy(struct hwm_drvdata *ddat, long *energy)
> +{
> +	struct intel_uncore *uncore = ddat->uncore;
> +	struct i915_hwmon *hwmon = ddat->hwmon;
> +	struct hwm_energy_info *ei = &ddat->ei;
> +	intel_wakeref_t wakeref;
> +	i915_reg_t rgaddr;
> +	u32 reg_val;
> +
> +	rgaddr = hwmon->rg.energy_status_all;
> +
> +	if (!i915_mmio_reg_valid(rgaddr))
> +		return -EOPNOTSUPP;

Delete two lines above. Something like this is only needed if we have
i915_hwmon_energy_status_get() which we are deleting
below. hwm_energy_is_visible() takes care of making the sysfs node
invisible when something cannot be supported and has the same check.

> +int
> +i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy)
> +{
> +	struct i915_hwmon *hwmon = i915->hwmon;
> +	struct hwm_drvdata *ddat = &hwmon->ddat;
> +
> +	return hwm_energy(ddat, energy);
> +}

Let's delete this function, there are no users for it at present.

> diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h
> index 7ca9cf2c34c9..4e5b6c149f3a 100644
> --- a/drivers/gpu/drm/i915/i915_hwmon.h
> +++ b/drivers/gpu/drm/i915/i915_hwmon.h
> @@ -17,4 +17,5 @@ static inline void i915_hwmon_register(struct drm_i915_private *i915) { };
>  static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { };
>  #endif
>
> +int i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy);

Delete.