Am 06.01.24 um 00:00 schrieb Felix Kuehling:
Properly mark kfd_process->ef as __rcu and consistently use the right
accessor functions.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202312052245.yFpBSgNH-lkp@xxxxxxxxx/
Signed-off-by: Felix Kuehling <felix.kuehling@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
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 | 7 +++++--
4 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index cf6ed5fce291..f262b9d89541 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -311,7 +311,7 @@ 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 48697b789342..5f445d856769 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -2802,7 +2802,7 @@ 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
@@ -2837,7 +2837,7 @@ 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 745024b31340..17fbedbf3651 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..717a60d7a4ea 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1110,6 +1110,7 @@ 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;
kfd_process_dequeue_from_all_devices(p);
pqm_uninit(&p->pqm);
@@ -1118,7 +1119,9 @@ 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);
+ synchronize_rcu();
+ ef = rcu_access_pointer(p->ef);
+ dma_fence_signal(ef);
kfd_process_remove_sysfs(p);
@@ -1127,7 +1130,7 @@ 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);
