Re: [PATCH] drm/amdgpu: don't attach the tlb fence for SI

["Timur Kristóf" <timur.kristof@gmail.com>]

On Tue, 2025-12-02 at 14:29 -0500, Alex Deucher wrote:
> SI hardware doesn't support pasids, user mode queues, or
> KIQ/MES so there is no need for this.  Doing so results in
> a segfault as these callbacks are non-existent for SI.
> 
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4744
> Fixes: f3854e04b708 ("drm/amdgpu: attach tlb fence to the PTs
> update")
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Thank you Alex!

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 6a2ea200d90c8..0eccb31793ca7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1069,7 +1069,9 @@ amdgpu_vm_tlb_flush(struct
> amdgpu_vm_update_params *params,
>  	}
>  
>  	/* Prepare a TLB flush fence to be attached to PTs */
> -	if (!params->unlocked) {
> +	if (!params->unlocked &&
> +	    /* SI doesn't support pasid or KIQ/MES */
> +	    params->adev->family > AMDGPU_FAMILY_SI) {
>  		amdgpu_vm_tlb_fence_create(params->adev, vm, fence);
>  
>  		/* Makes sure no PD/PT is freed before the flush */