[PATCH] drm/amdgpu: Avoid extra evict-restore process.

[Gang Ba]

If vm belongs to another process, this is fclose after fork,
wait may enable signaling KFD eviction fence and cause parent process queue evicted.

Signed-off-by: Gang Ba <Gang.Ba at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index f042372d9f2e..8ee1b7e62dee 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2410,6 +2410,13 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
  */
 long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout)
 {
+	/* If vm belongs to another process, this is fclose after fork,
+	 * wait may enable signaling KFD eviction fence and cause parent process queue evicted.
+	 */
+	if (vm->task_info->tgid &&
+	    vm->task_info->tgid != current->group_leader->pid)
+	      return 0;
+
 	timeout = dma_resv_wait_timeout(vm->root.bo->tbo.base.resv,
 					DMA_RESV_USAGE_BOOKKEEP,
 					true, timeout);
-- 
2.34.1