Re: [PATCH] drm/amdgpu: put the audio codec into suspend state before gpu reset V2

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On Tue, Apr 28, 2020 at 12:08 AM Quan, Evan <Evan.Quan@xxxxxxx> wrote:
>
> Hi Alex,
>
> The pm_runtime_autosuspend_expiration() return 0 due to ->use_autosuspend and autosuspend_delay are all zeros.
> This seems not kernel specific. As I can see this on 5.6-drm-next kernel and ubuntu original 5.3.46 kernel.
> Any insights why that happened?
> And maybe a compromise is: try the pm_runtime_autosuspend_expiration() first. And if failed(report 0), use a fixed interval(3S).

Seems fine.

Alex

>
> Regards,
> Evan
> -----Original Message-----
> From: Alex Deucher <alexdeucher@xxxxxxxxx>
> Sent: Wednesday, April 22, 2020 9:35 PM
> To: Quan, Evan <Evan.Quan@xxxxxxx>
> Cc: amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>
> Subject: Re: [PATCH] drm/amdgpu: put the audio codec into suspend state before gpu reset V2
>
> On Tue, Apr 21, 2020 at 10:42 PM Evan Quan <evan.quan@xxxxxxx> wrote:
> >
> > At default, the autosuspend delay of audio controller is 3S. If the
> > gpu reset is triggered within 3S(after audio controller idle), the
> > audio controller may be unable into suspended state. Then the sudden
> > gpu reset will cause some audio errors. The change here is targeted to
> > resolve this.
> >
> > However if the audio controller is in use when the gpu reset
> > triggered, this change may be still not enough to put the audio
> > controller into suspend state. Under this case, the gpu reset will
> > still proceed but there will be a warning message printed("failed to
> > suspend display audio").
> >
> > V2: limit this for BACO and mode1 reset only
> >
> > Change-Id: I33d85e6fcad1882eb33f9cde8916d57be8d5a87a
> > Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 70
> > ++++++++++++++++++++++
> >  1 file changed, 70 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index 2d4b78d96426..70f43b1aed78 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -69,6 +69,7 @@
> >
> >  #include <linux/suspend.h>
> >  #include <drm/task_barrier.h>
> > +#include <linux/pm_runtime.h>
> >
> >  MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
> >  MODULE_FIRMWARE("amdgpu/vega12_gpu_info.bin");
> > @@ -4146,6 +4147,59 @@ static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
> >         mutex_unlock(&adev->lock_reset);  }
> >
> > +static void amdgpu_device_resume_display_audio(struct amdgpu_device
> > +*adev) {
> > +       struct pci_dev *p = NULL;
> > +
> > +       p = pci_get_domain_bus_and_slot(pci_domain_nr(adev->pdev->bus),
> > +                       adev->pdev->bus->number, 1);
> > +       if (p) {
> > +               pm_runtime_enable(&(p->dev));
> > +               pm_runtime_resume(&(p->dev));
> > +       }
> > +}
> > +
> > +static int amdgpu_device_suspend_display_audio(struct amdgpu_device
> > +*adev) {
> > +       enum amd_reset_method reset_method;
> > +       struct pci_dev *p = NULL;
> > +       unsigned long end_jiffies;
> > +
> > +       /*
> > +        * For now, only BACO and mode1 reset are confirmed
> > +        * to suffer the audio issue without proper suspended.
> > +        */
> > +       reset_method = amdgpu_asic_reset_method(adev);
> > +       if ((reset_method != AMD_RESET_METHOD_BACO) &&
> > +            (reset_method != AMD_RESET_METHOD_MODE1))
> > +               return -EINVAL;
> > +
> > +       p = pci_get_domain_bus_and_slot(pci_domain_nr(adev->pdev->bus),
> > +                       adev->pdev->bus->number, 1);
> > +       if (!p)
> > +               return -ENODEV;
> > +
> > +       /*
> > +        * 3S is the audio controller default autosuspend delay setting.
> > +        * 4S used here is guaranteed to cover that.
> > +        */
>
> Instead of hardcoding 3S, we should probably use
> pm_runtime_autosuspend_expiration() to query how much time is left and then use that.  That way this will work even if userspace has changed the delay.  With that fixed:
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
>
> Alex
>
>
> > +       end_jiffies = msecs_to_jiffies(4000) + jiffies;
> > +       while (!pm_runtime_status_suspended(&(p->dev))) {
> > +               if (!pm_runtime_suspend(&(p->dev)))
> > +                       break;
> > +
> > +               if (time_after(jiffies, end_jiffies)) {
> > +                       dev_warn(adev->dev, "failed to suspend display audio\n");
> > +                       /* TODO: abort the succeeding gpu reset? */
> > +                       return -ETIMEDOUT;
> > +               }
> > +       }
> > +
> > +       pm_runtime_disable(&(p->dev));
> > +
> > +       return 0;
> > +}
> > +
> >  /**
> >   * amdgpu_device_gpu_recover - reset the asic and recover scheduler
> >   *
> > @@ -4170,6 +4224,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> >         bool use_baco =
> >                 (amdgpu_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) ?
> >                 true : false;
> > +       bool audio_suspended = false;
> >
> >         /*
> >          * Flush RAM to disk so that after reboot @@ -4227,6 +4282,19
> > @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> >                         return 0;
> >                 }
> >
> > +               /*
> > +                * Try to put the audio codec into suspend state
> > +                * before gpu reset started.
> > +                *
> > +                * Due to the power domain of the graphics device
> > +                * is shared with AZ power domain. Without this,
> > +                * we may change the audio hardware from behind
> > +                * the audio driver's back. That will trigger
> > +                * some audio codec errors.
> > +                */
> > +               if (!amdgpu_device_suspend_display_audio(tmp_adev))
> > +                       audio_suspended = true;
> > +
> >                 amdgpu_ras_set_error_query_ready(tmp_adev, false);
> >
> >
> > cancel_delayed_work_sync(&tmp_adev->delayed_init_work);
> > @@ -4339,6 +4407,8 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> >                 /*unlock kfd: SRIOV would do it separately */
> >                 if (!(in_ras_intr && !use_baco) && !amdgpu_sriov_vf(tmp_adev))
> >                         amdgpu_amdkfd_post_reset(tmp_adev);
> > +               if (audio_suspended)
> > +                       amdgpu_device_resume_display_audio(tmp_adev);
> >                 amdgpu_device_unlock_adev(tmp_adev);
> >         }
> >
> > --
> > 2.26.2
> >
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