[PATCH v4 2/2] radeon: use memcpy_to/fromio for UVD fw upload

[Alex Deucher]

Applied with the RB fixed.

Thanks!

Alex

On Fri, Jun 4, 2021 at 7:53 AM Chen Li <chenli at uniontech.com> wrote:
>
>
> I met a gpu addr bug recently and the kernel log
> tells me the pc is memcpy/memset and link register is
> radeon_uvd_resume.
>
> As we know, in some architectures, optimized memcpy/memset
> may not work well on device memory. Trival memcpy_toio/memset_io
> can fix this problem.
>
> BTW, amdgpu has already done it in:
> commit ba0b2275a678 ("drm/amdgpu: use memcpy_to/fromio for UVD fw upload"),
> that's why it has no this issue on the same gpu and platform.
>
> Signed-off-by: Chen Li <chenli at uniontech.com>
> Reviewed-by: Christian König
> ---
>  drivers/gpu/drm/radeon/radeon_uvd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
> index 85a1f2c31749..753da95e6abb 100644
> --- a/drivers/gpu/drm/radeon/radeon_uvd.c
> +++ b/drivers/gpu/drm/radeon/radeon_uvd.c
> @@ -288,7 +288,7 @@ int radeon_uvd_resume(struct radeon_device *rdev)
>         if (rdev->uvd.vcpu_bo == NULL)
>                 return -EINVAL;
>
> -       memcpy(rdev->uvd.cpu_addr, rdev->uvd_fw->data, rdev->uvd_fw->size);
> +       memcpy_toio((void __iomem *)rdev->uvd.cpu_addr, rdev->uvd_fw->data, rdev->uvd_fw->size);
>
>         size = radeon_bo_size(rdev->uvd.vcpu_bo);
>         size -= rdev->uvd_fw->size;
> @@ -296,7 +296,7 @@ int radeon_uvd_resume(struct radeon_device *rdev)
>         ptr = rdev->uvd.cpu_addr;
>         ptr += rdev->uvd_fw->size;
>
> -       memset(ptr, 0, size);
> +       memset_io((void __iomem *)ptr, 0, size);
>
>         return 0;
>  }
> --
> 2.31.1
>
>
>
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx