[PATCH 5/7] drm/amdgpu/userq: move waiting for last fence before umap

[Alex Deucher]

Need to wait for the last fence before unmapping.  This
also fixes a memory leak in amdgpu_userqueue_cleanup()
when the fence isn't signalled.

Fixes: 5b1163621548 ("drm/amdgpu/userq: rework front end call sequence")
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 23 ++++++++++++-------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
index 763532de5588d..a2b92b549c0f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
@@ -84,22 +84,27 @@ amdgpu_userqueue_map_helper(struct amdgpu_userq_mgr *uq_mgr,
 }
 
 static void
-amdgpu_userqueue_cleanup(struct amdgpu_userq_mgr *uq_mgr,
-                        struct amdgpu_usermode_queue *queue,
-                        int queue_id)
+amdgpu_userqueue_wait_for_last_fence(struct amdgpu_userq_mgr *uq_mgr,
+                                    struct amdgpu_usermode_queue *queue)
 {
        struct amdgpu_device *adev = uq_mgr->adev;
-       const struct amdgpu_userq_funcs *uq_funcs = 
adev->userq_funcs[queue->queue_type];
        struct dma_fence *f = queue->last_fence;
        int ret;
 
        if (f && !dma_fence_is_signaled(f)) {
                ret = dma_fence_wait_timeout(f, true, msecs_to_jiffies(100));
-               if (ret <= 0) {
-                       DRM_ERROR("Timed out waiting for fence f=%p\n", f);
-                       return;
-               }
+               if (ret <= 0)
+                       dev_err(adev->dev, "Timed out waiting for fence 
f=%p\n", f);
        }
+}
+
+static void
+amdgpu_userqueue_cleanup(struct amdgpu_userq_mgr *uq_mgr,
+                        struct amdgpu_usermode_queue *queue,
+                        int queue_id)
+{
+       struct amdgpu_device *adev = uq_mgr->adev;
+       const struct amdgpu_userq_funcs *uq_funcs = 
adev->userq_funcs[queue->queue_type];
 
        uq_funcs->mqd_destroy(uq_mgr, queue);
        queue->fence_drv->fence_drv_xa_ptr = NULL;
@@ -305,6 +310,7 @@ amdgpu_userqueue_destroy(struct drm_file *filp, int 
queue_id)
                mutex_unlock(&uq_mgr->userq_mutex);
                return -EINVAL;
        }
+       amdgpu_userqueue_wait_for_last_fence(uq_mgr, queue);
        r = amdgpu_userqueue_unmap_helper(uq_mgr, queue);
        amdgpu_bo_unpin(queue->db_obj.obj);
        amdgpu_bo_unref(&queue->db_obj.obj);
@@ -779,6 +785,7 @@ void amdgpu_userq_mgr_fini(struct amdgpu_userq_mgr 
*userq_mgr)
 
        mutex_lock(&userq_mgr->userq_mutex);
        idr_for_each_entry(&userq_mgr->userq_idr, queue, queue_id) {
+               amdgpu_userqueue_wait_for_last_fence(userq_mgr, queue);
                amdgpu_userqueue_unmap_helper(userq_mgr, queue);
                amdgpu_userqueue_cleanup(userq_mgr, queue, queue_id);
        }
-- 
2.49.0