> -----Original Message----- > From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf > Of Christian König > Sent: Friday, October 13, 2017 11:26 AM > To: amd-gfx at lists.freedesktop.org > Subject: [PATCH] drm/amdgpu: reserve root PD while releasing it > > From: Christian König <christian.koenig at amd.com> > > Otherwise somebody could try to evict it at the same time and try to use > halve torn down structures. > > Signed-off-by: Christian König <christian.koenig at amd.com> Reviewed-by: Alex Deucher <alexander.deucher at amd.com> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 13 +++++++++++-- > 1 file 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 b72ef2c652d0..ef8b7a9a735a 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)) > @@ -2794,7 +2795,15 @@ 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); > -- > 2.11.0 > > _______________________________________________ > amd-gfx mailing list > amd-gfx at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
