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| author | Christian König <christian.koenig@amd.com> | 2017-10-13 17:24:31 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2017-10-19 15:27:11 -0400 |
| commit | 2642cf110d08a403f585a051e4cbf45a90b3adea (patch) | |
| tree | c2d63a127f6abcd8da692f9bb6a8bcb9a5b72ead /drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | |
| parent | 5c42c64f7d54ba560b0b001e4e73e4a1aeed1355 (diff) | |
| download | lwn-2642cf110d08a403f585a051e4cbf45a90b3adea.tar.gz lwn-2642cf110d08a403f585a051e4cbf45a90b3adea.zip | |
drm/amdgpu: reserve root PD while releasing it
Otherwise somebody could try to evict it at the same time and try to use
half torn down structures.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index c559d76ff695..010d14195a5e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -2759,8 +2759,9 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm) { struct amdgpu_bo_va_mapping *mapping, *tmp; bool prt_fini_needed = !!adev->gart.gart_funcs->set_prt; + struct amdgpu_bo *root; u64 fault; - int i; + int i, r; /* Clear pending page faults from IH when the VM is destroyed */ while (kfifo_get(&vm->faults, &fault)) @@ -2795,7 +2796,15 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm) amdgpu_vm_free_mapping(adev, vm, mapping, NULL); } - amdgpu_vm_free_levels(&vm->root); + root = amdgpu_bo_ref(vm->root.base.bo); + r = amdgpu_bo_reserve(root, true); + if (r) { + dev_err(adev->dev, "Leaking page tables because BO reservation failed\n"); + } else { + amdgpu_vm_free_levels(&vm->root); + amdgpu_bo_unreserve(root); + } + amdgpu_bo_unref(&root); dma_fence_put(vm->last_update); for (i = 0; i < AMDGPU_MAX_VMHUBS; i++) amdgpu_vm_free_reserved_vmid(adev, vm, i); |