Hi Michel,
> This seems like a bad idea, as it would cause basically any userspace
which
> wants to use the GPU to fail to start during a GPU reset.
[Emily] Yes, this is what the change want to do, when driver is doing gpu
recover or hardware is doing reset,
it doesn't want to be interrupted, and during the reset any driver open kms is
meaningless. This behavior could
let the gpu recover and hardware reset back more quickly. After finished the
reset, we will set adev->in_gpu_reset=0
again, then could allow the application open the kms.
Best Wishes,
Emily Deng
> -----Original Message-----
> From: Michel Dänzer [mailto:[email protected]]
> Sent: Wednesday, April 25, 2018 3:48 PM
> To: Deng, Emily <[email protected]>
> Cc: [email protected]; Liu, Monk <[email protected]>
> Subject: Re: [PATCH] drm/amdgpu/sriov: reject kms open if TDR not finished
> or failed
>
> On 2018-04-25 08:39 AM, Emily Deng wrote:
> > Signed-off-by: Monk Liu <[email protected]>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > index 6d55cae..adeca71 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > @@ -847,6 +847,9 @@ int amdgpu_driver_open_kms(struct drm_device
> *dev, struct drm_file *file_priv)
> > struct amdgpu_fpriv *fpriv;
> > int r, pasid;
> >
> > + if (adev->in_gpu_reset)
> > + return -ECANCELED;
>
> This seems like a bad idea, as it would cause basically any userspace which
> wants to use the GPU to fail to start during a GPU reset.
>
>
> --
> Earthling Michel Dänzer | http://www.amd.com
> Libre software enthusiast | Mesa and X developer
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