Re: [PATCH 3/3] drm/amdgpu: add saved_bo to save vce 4.0 context when suspend

[Leo Liu <leo.liu-5C7GfCeVMHo@public.gmane.org>]

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On 05/31/2017 03:54 PM, Deucher, Alexander wrote:
> > -----Original Message-----
> > From: amd-gfx [mailto:amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org] On Behalf
> > Of Leo Liu
> > Sent: Wednesday, May 31, 2017 3:28 PM
> > To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> > Cc: Liu, Leo
> > Subject: [PATCH 3/3] drm/amdgpu: add saved_bo to save vce 4.0 context
> > when suspend
> >
> > We are using PSP to resume firmware after suspend, and it is
> > resumed at where it got suspended, so we'd better save the
> > the context.
> >
> > Signed-off-by: Leo Liu <leo.liu-5C7GfCeVMHo@public.gmane.org>
>
> Patches 1, 2 are:
> Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>
> A few comments below on patch 3.
>
>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h |  1 +
> >  drivers/gpu/drm/amd/amdgpu/vce_v4_0.c   | 39
> > ++++++++++++++++++++++++++++-----
> >  2 files changed, 35 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> > index c93f74a..5ce54cd 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h
> > @@ -34,6 +34,7 @@ struct amdgpu_vce {
> >        struct amdgpu_bo        *vcpu_bo;
> >        uint64_t                gpu_addr;
> >        void                    *cpu_addr;
> > +     void                    *saved_bo;
> >        unsigned                fw_version;
> >        unsigned                fb_version;
> >        atomic_t handles[AMDGPU_MAX_VCE_HANDLES];
> > diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
> > b/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
> > index 0b7fcc1..2230a99 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
> > @@ -522,8 +522,22 @@ static int vce_v4_0_hw_fini(void *handle)
> >
> >  static int vce_v4_0_suspend(void *handle)
> >  {
> > -     int r;
> >        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > +     int r;
> > +
> > +     if (adev->vce.vcpu_bo == NULL)
> > +             return 0;
> > +
> > +     if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
> > +             unsigned size = amdgpu_bo_size(adev->vce.vcpu_bo);
> > +             void *ptr = adev->vce.cpu_addr;
> > +
> > +             adev->vce.saved_bo = kmalloc(size, GFP_KERNEL);
>
> Might want to avoid malloc/free in the suspend/resume paths.  Just 
> malloc/free the memory at sw_init/fini time.

Just waste a bit memory if it never goes to suspend, but sure, I will 
fix it in v2.

Thanks,
Leo

>
> > +             if (!adev->vce.saved_bo)
> > +                     return -ENOMEM;
> > +
> > +             memcpy_fromio(adev->vce.saved_bo, ptr, size);
> > +     }
> >
> >        r = vce_v4_0_hw_fini(adev);
> >        if (r)
> > @@ -534,12 +548,27 @@ static int vce_v4_0_suspend(void *handle)
> >
> >  static int vce_v4_0_resume(void *handle)
> >  {
> > -     int r;
> >        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> > +     int r;
> >
> > -     r = amdgpu_vce_resume(adev);
> > -     if (r)
> > -             return r;
> > +     if (adev->vce.vcpu_bo == NULL)
> > +             return -EINVAL;
> > +
> > +     if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
> > +             unsigned size = amdgpu_bo_size(adev->vce.vcpu_bo);
> > +             void *ptr = adev->vce.cpu_addr;
> > +
> > +             if (adev->vce.saved_bo != NULL) {
> > +                     memcpy_toio(ptr, adev->vce.saved_bo, size);
> > +                     kfree(adev->vce.saved_bo);
> > +                     adev->vce.saved_bo = NULL;
> > +             } else
>
> Kernel coding style; should be } else { ... } to match the chunk above.
>
> > +                     memset_io(ptr, 0, size);
> > +     } else {
> > +             r = amdgpu_vce_resume(adev);
> > +             if (r)
> > +                     return r;
> > +     }
> >
> >        return vce_v4_0_hw_init(adev);
> >  }
> > --
> > 2.7.4
> >
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> > amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
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