drm/amdkfd: Check correct memory types for is_system variable

To catch GPU mapping of system memory, TTM_PL_TT and AMDGPU_PL_PREEMPT
must be checked.

Fixes: 628e1ac ("drm/amdkfd: mark GFX12 system and peer GPU memory mappings as MTYPE_NC")
Signed-off-by: Sreekant Somasekharan <sreekant.somasekharan@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Sreekant Somasekharan

drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c

@@ -524,7 +524,8 @@ static void gmc_v12_0_get_vm_pte(struct amdgpu_device *adev,
 
 	bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	coherent = bo->flags & AMDGPU_GEM_CREATE_COHERENT;
-	is_system = bo->tbo.resource->mem_type == TTM_PL_SYSTEM;
+	is_system = (bo->tbo.resource->mem_type == TTM_PL_TT) ||
+		(bo->tbo.resource->mem_type == AMDGPU_PL_PREEMPT);
 
 	/* WA for HW bug */
 	if (is_system || ((bo_adev != adev) && coherent))