[PATCH 5/9] drm/amdgpu: rework moved handling in the VM

[Christian König]

From: Christian König <christian.koenig at amd.com>

Instead of using the vm_state use a separate flag to note
that the BO was moved.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 13 +++++++------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  3 +++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 16148ef..85189f1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1787,13 +1787,13 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 	else
 		flags = 0x0;
 
-	/* We access vm_status without the status lock here, but that is ok
-	 * because when we don't clear the BO is locked and so the status can't
-	 * change
-	 */
-	if ((!clear && !list_empty(&bo_va->base.vm_status)) ||
-	    bo_va->cleared != clear)
+	if (!clear && bo_va->base.moved) {
+		bo_va->base.moved = false;
+		list_splice_init(&bo_va->valids, &bo_va->invalids);
+
+	} else if (bo_va->cleared != clear) {
 		list_splice_init(&bo_va->valids, &bo_va->invalids);
+	}
 
 	list_for_each_entry(mapping, &bo_va->invalids, list) {
 		r = amdgpu_vm_bo_split_mapping(adev, exclusive, pages_addr, vm,
@@ -2418,6 +2418,7 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
 	struct amdgpu_vm_bo_base *bo_base;
 
 	list_for_each_entry(bo_base, &bo->va, bo_list) {
+		bo_base->moved = true;
 		spin_lock(&bo_base->vm->status_lock);
 		list_move(&bo_base->vm_status, &bo_base->vm->moved);
 		spin_unlock(&bo_base->vm->status_lock);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index e705f0f..ff093d4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -105,6 +105,9 @@ struct amdgpu_vm_bo_base {
 
 	/* protected by spinlock */
 	struct list_head		vm_status;
+
+	/* protected by the BO being reserved */
+	bool				moved;
 };
 
 struct amdgpu_vm_pt {
-- 
2.7.4