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drm/amdgpu: reserve root PD while releasing it

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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>
This commit is contained in:
Christian König 2017-10-13 17:24:31 +02:00 committed by Alex Deucher
parent 5c42c64f7d
commit 2642cf110d
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -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);