[PATCH] drm/amdgpu: ensure no PCIe peer access for CPU XGMI iolinks

[Alex Deucher]

On Fri, Aug 26, 2022 at 11:48 AM Alex Sierra <alex.sierra at amd.com> wrote:
>
> [Why] Devices with CPU XGMI iolink do not support PCIe peer access.
>
> Signed-off-by: Alex Sierra <alex.sierra at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index ce7d117efdb5..1ff66718639d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -5538,7 +5538,8 @@ bool amdgpu_device_is_peer_accessible(struct amdgpu_device *adev,
>         return pcie_p2p && p2p_access && (adev->gmc.visible_vram_size &&
>                 adev->gmc.real_vram_size == adev->gmc.visible_vram_size &&
>                 !(adev->gmc.aper_base & address_mask ||
> -                 aper_limit & address_mask));
> +                 aper_limit & address_mask) &&
> +               !adev->gmc.xgmi.connected_to_cpu);
>  #else
>         return false;
>  #endif
> --
> 2.32.0
>