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uoPzFY/yeeZ3II/PlAuvFFxGLbHIzMMAbMpQRhLWTgAtOeVP8vu+hY5JpGRZhPfSXBbNlDlJew6oAiFeMkbK4MNvp6Q723owR63HCxD+Fv/xIWEyh2bhtIBwLLV8X0xWpToqBSo7uhjs+YAIXxOf7b1pQhfAByHJqP2cLECylj+qLkKWiaGBqiVQuwXzwsDzUk+JFtSjqDjF/4KJ6efGTawm6DCQktJabpFNPvBC2BK6VoWjv9aVYVtu5Sp/KrZWg/HpK4lSzCkBQW/dD4DZLIY7ciNNW3BDpOuDaFCxGDwwc5itIrp/0mNbAoKYXTjJDoBQT24p1CXo/NKORp23AsbRdyyUnDIj4OlwFCB0y6bqc68UdJFcEsCDsTmw5lzYiU2XDQMmRz4pBRYnRbtKtWAf9YFEc2cj/yTxHnTb85n1a3DD2a7u1wSj3aw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2023-12-05 17:20, Felix Kuehling wrote: > Properly mark kfd_process->ef as __rcu and consistently access it with > rcu_dereference_protected. > > Reported-by: kernel test robot > Closes: https://lore.kernel.org/oe-kbuild-all/202312052245.yFpBSgNH-lkp@intel.com/ > Signed-off-by: Felix Kuehling ping. Christian, would you review this patch, please? Thanks,   Felix > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 2 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 4 ++-- > drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 2 +- > drivers/gpu/drm/amd/amdkfd/kfd_process.c | 6 ++++-- > 4 files changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h > index f2e920734c98..20cb266dcedd 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h > @@ -314,7 +314,7 @@ void amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(struct kgd_mem *mem); > int amdgpu_amdkfd_map_gtt_bo_to_gart(struct amdgpu_device *adev, struct amdgpu_bo *bo); > > int amdgpu_amdkfd_gpuvm_restore_process_bos(void *process_info, > - struct dma_fence **ef); > + struct dma_fence __rcu **ef); > int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct amdgpu_device *adev, > struct kfd_vm_fault_info *info); > int amdgpu_amdkfd_gpuvm_import_dmabuf_fd(struct amdgpu_device *adev, int fd, > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c > index 7d91f99acb59..8ba6f6c8363d 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c > @@ -2806,7 +2806,7 @@ static void amdgpu_amdkfd_restore_userptr_worker(struct work_struct *work) > put_task_struct(usertask); > } > > -static void replace_eviction_fence(struct dma_fence **ef, > +static void replace_eviction_fence(struct dma_fence __rcu **ef, > struct dma_fence *new_ef) > { > struct dma_fence *old_ef = rcu_replace_pointer(*ef, new_ef, true > @@ -2841,7 +2841,7 @@ static void replace_eviction_fence(struct dma_fence **ef, > * 7. Add fence to all PD and PT BOs. > * 8. Unreserve all BOs > */ > -int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef) > +int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence __rcu **ef) > { > struct amdkfd_process_info *process_info = info; > struct amdgpu_vm *peer_vm; > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h > index 45366b4ca976..5a24097a9f28 100644 > --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h > @@ -917,7 +917,7 @@ struct kfd_process { > * fence will be triggered during eviction and new one will be created > * during restore > */ > - struct dma_fence *ef; > + struct dma_fence __rcu *ef; > > /* Work items for evicting and restoring BOs */ > struct delayed_work eviction_work; > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c > index 71df51fcc1b0..14b11d61f8dd 100644 > --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c > @@ -1110,6 +1110,8 @@ static void kfd_process_wq_release(struct work_struct *work) > { > struct kfd_process *p = container_of(work, struct kfd_process, > release_work); > + struct dma_fence *ef = rcu_dereference_protected(p->ef, > + kref_read(&p->ref) == 0); > > kfd_process_dequeue_from_all_devices(p); > pqm_uninit(&p->pqm); > @@ -1118,7 +1120,7 @@ static void kfd_process_wq_release(struct work_struct *work) > * destroyed. This allows any BOs to be freed without > * triggering pointless evictions or waiting for fences. > */ > - dma_fence_signal(p->ef); > + dma_fence_signal(ef); > > kfd_process_remove_sysfs(p); > > @@ -1127,7 +1129,7 @@ static void kfd_process_wq_release(struct work_struct *work) > svm_range_list_fini(p); > > kfd_process_destroy_pdds(p); > - dma_fence_put(p->ef); > + dma_fence_put(ef); > > kfd_event_free_process(p); >