[AMD Official Use Only]
> -----Original Message-----
> From: Lazar, Lijo <Lijo.Lazar@xxxxxxx>
> Sent: Monday, January 10, 2022 3:36 PM
> To: Quan, Evan <Evan.Quan@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>
> Subject: Re: [PATCH] drm/amd/pm: correct the checks for fan attributes
> support
>
>
>
> On 1/10/2022 11:30 AM, Evan Quan wrote:
> > Before we relied on the return values from the corresponding interfaces.
> > That is with low efficiency. And the wrong intermediate variable used
> > makes the fan mode stuck at manual mode which then causes overheating
> in
> > 3D graphics tests.
> >
> > Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
> > Change-Id: Ia93ccf3b929c12e6d10b50c8f3596783ac63f0e3
> > ---
> > drivers/gpu/drm/amd/pm/amdgpu_dpm.c | 23
> +++++++++++++++++++++++
> > drivers/gpu/drm/amd/pm/amdgpu_pm.c | 20 ++++++++++----------
> > drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h | 12 ++++++++++++
> > 3 files changed, 45 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
> b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
> > index 68d2e80a673b..e732418a9558 100644
> > --- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
> > +++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
> > @@ -1547,3 +1547,26 @@ int amdgpu_dpm_get_dpm_clock_table(struct
> amdgpu_device *adev,
> >
> > return ret;
> > }
> > +
> > +int amdgpu_dpm_is_fan_operation_supported(struct amdgpu_device
> *adev,
> > + enum fan_operation_id id)
> > +{
> > + const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
> > +
> > + switch (id) {
> > + case FAN_CONTROL_MODE_RETRIEVING:
> > + return pp_funcs->get_fan_control_mode ? 1 : 0;
> > + case FAN_CONTROL_MODE_SETTING:
> > + return pp_funcs->set_fan_control_mode ? 1 : 0;
> > + case FAN_SPEED_PWM_RETRIEVING:
> > + return pp_funcs->get_fan_speed_pwm ? 1 : 0;
> > + case FAN_SPEED_PWM_SETTING:
> > + return pp_funcs->set_fan_speed_pwm ? 1 : 0;
> > + case FAN_SPEED_RPM_RETRIEVING:
> > + return pp_funcs->get_fan_speed_rpm ? 1 : 0;
> > + case FAN_SPEED_RPM_SETTING:
> > + return pp_funcs->set_fan_speed_rpm ? 1 : 0;
> > + default:
> > + return 0;
> > + }
> > +}
> > diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > index d3eab245e0fe..57721750c51a 100644
> > --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> > @@ -3263,15 +3263,15 @@ static umode_t
> hwmon_attributes_visible(struct kobject *kobj,
> > return 0;
> >
> > /* mask fan attributes if we have no bindings for this asic to expose
> */
> > - if (((amdgpu_dpm_get_fan_speed_pwm(adev, &speed) == -EINVAL)
> &&
> > + if ((!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_PWM_RETRIEVING) &&
>
> As per the current logic, it's really checking the hardware registers.
[Quan, Evan] I probably should mention the "current" version you see now is actually a regression introduced by the commit below:
801771de0331 drm/amd/pm: do not expose power implementation details to amdgpu_pm.c
The very early version(which works good) is something like below:
- if (!is_support_sw_smu(adev)) {
- /* mask fan attributes if we have no bindings for this asic to expose */
- if ((!adev->powerplay.pp_funcs->get_fan_speed_pwm &&
- attr == &sensor_dev_attr_pwm1.dev_attr.attr) || /* can't query fan */
- (!adev->powerplay.pp_funcs->get_fan_control_mode &&
- attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr)) /* can't query state */
- effective_mode &= ~S_IRUGO;
So, the changes here are really just back to old working version. It aims to provide a quick fix for the failures reported by CQE.
> For ex: we could have some SKUs that have PMFW based fan control and for
> some other SKUs, AIBs could be having a different cooling solution which
> doesn't make use of PMFW.
>
>
> > attr == &sensor_dev_attr_pwm1.dev_attr.attr) || /* can't query
> fan */
> > - ((amdgpu_dpm_get_fan_control_mode(adev, &speed) == -
> EOPNOTSUPP) &&
> > + (!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_CONTROL_MODE_RETRIEVING) &&
> > attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr)) /* can't
> query state */
> > effective_mode &= ~S_IRUGO;
> >
> > - if (((amdgpu_dpm_set_fan_speed_pwm(adev, speed) == -EINVAL)
> &&
> > + if ((!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_PWM_SETTING) &&
> > attr == &sensor_dev_attr_pwm1.dev_attr.attr) || /* can't
> manage fan */
> > - ((amdgpu_dpm_set_fan_control_mode(adev, speed) == -
> EOPNOTSUPP) &&
> > + (!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_CONTROL_MODE_SETTING) &&
> > attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr)) /* can't
> manage state */
> > effective_mode &= ~S_IWUSR;
> >
> > @@ -3291,16 +3291,16 @@ static umode_t
> hwmon_attributes_visible(struct kobject *kobj,
> > return 0;
> >
> > /* hide max/min values if we can't both query and manage the fan */
> > - if (((amdgpu_dpm_set_fan_speed_pwm(adev, speed) == -EINVAL)
> &&
> > - (amdgpu_dpm_get_fan_speed_pwm(adev, &speed) == -EINVAL)
> &&
> > - (amdgpu_dpm_set_fan_speed_rpm(adev, speed) == -EINVAL)
> &&
> > - (amdgpu_dpm_get_fan_speed_rpm(adev, &speed) == -EINVAL))
> &&
> > + if ((!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_PWM_SETTING) &&
> > + !amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_PWM_RETRIEVING) &&
> > + !amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_RPM_SETTING) &&
> > + !amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_RPM_RETRIEVING)) &&
>
> If this is the case, I think we should set pm.no_fan since nothing is
> possible.
[Quan, Evan] Yep, I agree a more optimized version should be something like that.
Let's take this a quick solution and do further optimizations later.
BR
Evan
>
> Thanks,
> Lijo
>
> > (attr == &sensor_dev_attr_pwm1_max.dev_attr.attr ||
> > attr == &sensor_dev_attr_pwm1_min.dev_attr.attr))
> > return 0;
> >
> > - if ((amdgpu_dpm_set_fan_speed_rpm(adev, speed) == -EINVAL)
> &&
> > - (amdgpu_dpm_get_fan_speed_rpm(adev, &speed) == -EINVAL)
> &&
> > + if ((!amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_RPM_SETTING) &&
> > + !amdgpu_dpm_is_fan_operation_supported(adev,
> FAN_SPEED_RPM_RETRIEVING)) &&
> > (attr == &sensor_dev_attr_fan1_max.dev_attr.attr ||
> > attr == &sensor_dev_attr_fan1_min.dev_attr.attr))
> > return 0;
> > diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> > index ba857ca75392..9e18151a3c46 100644
> > --- a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> > +++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
> > @@ -330,6 +330,16 @@ struct amdgpu_pm {
> > bool pp_force_state_enabled;
> > };
> >
> > +enum fan_operation_id
> > +{
> > + FAN_CONTROL_MODE_RETRIEVING = 0,
> > + FAN_CONTROL_MODE_SETTING = 1,
> > + FAN_SPEED_PWM_RETRIEVING = 2,
> > + FAN_SPEED_PWM_SETTING = 3,
> > + FAN_SPEED_RPM_RETRIEVING = 4,
> > + FAN_SPEED_RPM_SETTING = 5,
> > +};
> > +
> > u32 amdgpu_dpm_get_vblank_time(struct amdgpu_device *adev);
> > int amdgpu_dpm_read_sensor(struct amdgpu_device *adev, enum
> amd_pp_sensors sensor,
> > void *data, uint32_t *size);
> > @@ -510,4 +520,6 @@ enum pp_smu_status
> amdgpu_dpm_get_uclk_dpm_states(struct amdgpu_device *adev,
> > unsigned int *num_states);
> > int amdgpu_dpm_get_dpm_clock_table(struct amdgpu_device *adev,
> > struct dpm_clocks *clock_table);
> > +int amdgpu_dpm_is_fan_operation_supported(struct amdgpu_device
> *adev,
> > + enum fan_operation_id id);
> > #endif
> >
