On Mon, Feb 07, 2022 at 10:41:55AM +0800, Liu, Aaron wrote:
> Bypass group programming (utcl2_harvest) aims to forbid UTCL2 to send
> invalidation command to harvested SE/SA. Once invalidation command comes
> into harvested SE/SA, SE/SA has no response and system hang.
>
> This patch is to add checking if the GART table is already allocated before
> invalidating TLB. The new procedure is as following:
> 1. Calling amdgpu_gtt_mgr_init() in amdgpu_ttm_init(). After this step GTT
> BOs can be allocated, but GART mappings are still ignored.
> 2. Calling amdgpu_gart_table_vram_alloc() from the GMC code. This allocates
> the GART backing store.
> 3. Initializing the hardware, and programming the backing store into VMID0
> for all VMHUBs.
> 4. Calling amdgpu_gtt_mgr_recover() to make sure the table is updated with
> the GTT allocations done before it was allocated.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> Signed-off-by: Aaron Liu <aaron.liu@xxxxxxx>
Acked-by: Huang Rui <ray.huang@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
> index 91d8207336c1..01cb89ffbd56 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
> @@ -259,6 +259,9 @@ void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
> {
> int i;
>
> + if (!adev->gart.ptr)
> + return;
> +
> mb();
> amdgpu_device_flush_hdp(adev, NULL);
> for (i = 0; i < adev->num_vmhubs; i++)
> --
> 2.25.1
>
