[PATCH] drm/amd/amdgpu: Add a GPU_LOAD entry to sysfs

[Alex Deucher]

On Wed, Jun 20, 2018 at 10:39 AM, Tom St Denis <tstdenis at amd.com> wrote:
>
>
> 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,
>>  >         return -EINVAL;
>>  > }
>>  >
>>  >+static ssize_t amdgpu_get_busy_level(struct device *dev,
>>  >+               struct device_attribute *attr,
>>  >+               char *buf)
>>  >+{
>>  >+       struct drm_device *ddev = dev_get_drvdata(dev);
>>  >+       struct amdgpu_device *adev = ddev->dev_private;
>>  >+       int r, value, size = sizeof(value);
>>  >+
>>  >+       /* sanity check PP is enabled */
>>  >+       if (!(adev->powerplay.pp_funcs &&
>>  >+             adev->powerplay.pp_funcs->read_sensor))
>>  >+               return -EINVAL;
>>  >+
>>  >+       /* 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...).

It's the overall busy status of all blocks that contribute to what the
SMU considers busy for the purpose of dynamic clocking.

Alex

>
> Tom
>
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