From 9542776d2b5d87c4c6e736867ef4254d58d2e041 Mon Sep 17 00:00:00 2001 From: christian koenig Date: Thu, 19 Apr 2018 11:08:24 +0200 Subject: [PATCH 4507/5725] drm/amdgpu: further optimize amdgpu_vm_handle_moved MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Splice the moved list to a local one to avoid taking the lock over and over again. Change-Id: I690a56f9ef5914f781aa584407d9abff2c77f99f Signed-off-by: Christian König Reviewed-by: Chunming Zhou Reviewed-by: Junwei Zhang Signed-off-by: Kalyan Alle --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 47dfcdb..a8dbd20 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -1811,19 +1811,18 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev, int amdgpu_vm_handle_moved(struct amdgpu_device *adev, struct amdgpu_vm *vm) { + struct amdgpu_bo_va *bo_va, *tmp; + struct list_head moved; bool clear; - int r = 0; + int r; + INIT_LIST_HEAD(&moved); spin_lock(&vm->moved_lock); - while (!list_empty(&vm->moved)) { - struct amdgpu_bo_va *bo_va; - struct reservation_object *resv; - - bo_va = list_first_entry(&vm->moved, - struct amdgpu_bo_va, base.vm_status); - spin_unlock(&vm->moved_lock); + list_splice_init(&vm->moved, &moved); + spin_unlock(&vm->moved_lock); - resv = bo_va->base.bo->tbo.resv; + list_for_each_entry_safe(bo_va, tmp, &moved, base.vm_status) { + struct reservation_object *resv = bo_va->base.bo->tbo.resv; /* Per VM BOs never need to bo cleared in the page tables */ if (resv == vm->root.base.bo->tbo.resv) @@ -1836,17 +1835,19 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev, clear = true; r = amdgpu_vm_bo_update(adev, bo_va, clear); - if (r) - return r; + if (r) { + spin_lock(&vm->moved_lock); + list_splice(&moved, &vm->moved); + spin_unlock(&vm->moved_lock); + return r; + } if (!clear && resv != vm->root.base.bo->tbo.resv) reservation_object_unlock(resv); - spin_lock(&vm->moved_lock); } - spin_unlock(&vm->moved_lock); - return r; + return 0; } /** -- 2.7.4