[PATCH] drm/amdgpu: Reorder ttm_resource_manager_evict_all() before disabling ttm resource manager

[Leslie Shi]

ttm_resource_manager_evict_all() evicts objects out of resource manager
until lru is empty. ttm_resource_manager_set_used() WARN_ON non-empty lru.
This patch exchanges these two function calls to avoid following call trace
during amdgpu driver unload:

WARNING: CPU: 6 PID: 22873 at
include/drm/ttm/ttm_resource.h:229 amdgpu_vram_mgr_fini+0x145/0x160 [amdgpu]

Call Trace:
    amdgpu_ttm_fini+0x2c2/0x370 [amdgpu]
    amdgpu_bo_fini+0x25/0x90 [amdgpu]
    gmc_v10_0_sw_fini+0x2b/0x40 [amdgpu]
    amdgpu_device_fini_sw+0xd2/0x370 [amdgpu]
    amdgpu_driver_release_kms+0x16/0x30 [amdgpu]
    drm_dev_release+0x28/0x40 [drm]
    devm_drm_dev_init_release+0x30/0x50 [drm]
    devm_action_release+0x15/0x20
    release_nodes+0x19a/0x1e0
    devres_release_all+0x3f/0x50
    device_release_driver_internal+0x11e/0x1e0
    driver_detach+0x4c/0x90
    bus_remove_driver+0x5c/0xd0
    driver_unregister+0x31/0x50
    pci_unregister_driver+0x40/0x90
    amdgpu_exit+0x15/0x12a [amdgpu]

Signed-off-by: Leslie Shi <Yuliang.Shi at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c     | 4 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_preempt_mgr.c | 4 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c    | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
index c5263908caec..e472a0d639fa 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -308,12 +308,12 @@ void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
 	struct ttm_resource_manager *man = &mgr->manager;
 	int ret;
 
-	ttm_resource_manager_set_used(man, false);
-
 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 	if (ret)
 		return;
 
+	ttm_resource_manager_set_used(man, false);
+
 	spin_lock(&mgr->lock);
 	drm_mm_takedown(&mgr->mm);
 	spin_unlock(&mgr->lock);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_preempt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_preempt_mgr.c
index 786afe4f58f9..798be117c3bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_preempt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_preempt_mgr.c
@@ -182,12 +182,12 @@ void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
 	struct ttm_resource_manager *man = &mgr->manager;
 	int ret;
 
-	ttm_resource_manager_set_used(man, false);
-
 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 	if (ret)
 		return;
 
+	ttm_resource_manager_set_used(man, false);
+
 	device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
 
 	ttm_resource_manager_cleanup(man);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 6c99ef700cc8..f94f2b271544 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -718,12 +718,12 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
 	int ret;
 	struct amdgpu_vram_reservation *rsv, *temp;
 
-	ttm_resource_manager_set_used(man, false);
-
 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 	if (ret)
 		return;
 
+	ttm_resource_manager_set_used(man, false);
+
 	spin_lock(&mgr->lock);
 	list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, node)
 		kfree(rsv);
-- 
2.25.1