On 06/20/2018 10:37 AM, Abramov, Slava wrote:
> I see some functions in amdgpu_pm.c have function level documentation,
> so that it would be good to have this for newly added functions.
Sure I can add some comments/docs.
> Another comment is inline.
>
>
>>From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Tom St Denis <tom.stdenis at amd.com>
>
> >Sent: Wednesday, June 20, 2018 8:31 AM
> >To: amd-gfx at lists.freedesktop.org
> >Cc: StDenis, Tom
> >Subject: [PATCH] drm/amd/amdgpu: Add a GPU_LOAD entry to sysfs
> >
> >This adds what should be a stable interface to read GPU
> >load from userspace.
> >
> >Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
> >---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 41
> ++++++++++++++++++++++++++++++++++
> > 1 file changed, 41 insertions(+)
> >
> >diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> >index 113edffb5960..d57b414ac228 100644
> >--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> >+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
> >@@ -918,6 +918,37 @@ static ssize_t
> amdgpu_set_pp_power_profile_mode(struct device *dev,
> >Â Â Â Â Â return -EINVAL;
> > }
> >
> >+static ssize_t amdgpu_get_busy_level(struct device *dev,
> >+Â Â Â Â Â Â Â Â struct device_attribute *attr,
> >+Â Â Â Â Â Â Â Â char *buf)
> >+{
> >+Â Â Â Â struct drm_device *ddev = dev_get_drvdata(dev);
> >+Â Â Â Â struct amdgpu_device *adev = ddev->dev_private;
> >+Â Â Â Â int r, value, size = sizeof(value);
> >+
> >+Â Â Â Â /* sanity check PP is enabled */
> >+Â Â Â Â if (!(adev->powerplay.pp_funcs &&
> >+Â Â Â Â Â Â Â adev->powerplay.pp_funcs->read_sensor))
> >+Â Â Â Â Â Â Â Â return -EINVAL;
> >+
> >+Â Â Â Â /* get the temperature */
>
> Is load is the same thing as temperature?
Nope, there is a separate sensor for that but it is included in hwmon
and Alex would rather not duplicate it.
GPU_LOAD is a value returned by firmware based on the RLC busy status (I
think...).
Tom
