[PATCH] drm/amdgpu: return an error for hw access in INFO ioctl when in reset

[Alex Deucher]

ping?

On Fri, Jun 26, 2020 at 10:04 AM Alex Deucher <alexdeucher at gmail.com> wrote:
>
> When the GPU is in reset, accessing the hw is unreliable and could
> interfere with the reset.  Return an error in those cases.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 341d072edd95..fd51d6554ee2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -684,6 +684,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
>                 if (info->read_mmr_reg.count > 128)
>                         return -EINVAL;
>
> +               if (adev->in_gpu_reset)
> +                       return -EPERM;
> +
>                 regs = kmalloc_array(info->read_mmr_reg.count, sizeof(*regs), GFP_KERNEL);
>                 if (!regs)
>                         return -ENOMEM;
> @@ -854,6 +857,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
>                 if (!adev->pm.dpm_enabled)
>                         return -ENOENT;
>
> +               if (adev->in_gpu_reset)
> +                       return -EPERM;
> +
>                 switch (info->sensor_info.type) {
>                 case AMDGPU_INFO_SENSOR_GFX_SCLK:
>                         /* get sclk in Mhz */
> --
> 2.25.4
>