[RFC PATCH 07/13] drm/amdgpu: enhance amdgpu_ras_pre_fini() to better support SR

[Jiang Liu]

Enhance amdgpu_ras_pre_fini() to better support suspend/resume by:
1) fix possible resource leakage. amdgpu_release_ras_context() only
   kfree(con) but doesn't release resources associated with the con
   object.
2) call amdgpu_ras_pre_fini() in amdgpu_device_suspend() to undo what
   has been done by amdgpu_ras_late_init(), because amdgpu_device_resume()
   will invoke amdgpu_ras_late_init() on resume.
3) move amdgpu_ras_recovery_fini() from amdgpu_ras_pre_fini() to
   amdgpu_ras_fini()
4) move calling of `obj->ras_fini()` from amdgpu_ras_fini() to
   amdgpu_ras_pre_fini().

Signed-off-by: Jiang Liu <gerry at linux.alibaba.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  6 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c    | 45 ++++++++++++++--------
 2 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 602322bd7cb8..7ee8f9d73c3c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4599,6 +4599,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	return 0;
 
 release_ras_con:
+	amdgpu_ras_pre_fini(adev);
+	amdgpu_ras_fini(adev);
 	if (amdgpu_sriov_vf(adev))
 		amdgpu_virt_release_full_gpu(adev, true);
 
@@ -4613,8 +4615,6 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		adev->virt.ops = NULL;
 		r = -EAGAIN;
 	}
-	amdgpu_release_ras_context(adev);
-
 failed:
 	amdgpu_vf_error_trans_all(adev);
 
@@ -4875,6 +4875,8 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
 
 	cancel_delayed_work_sync(&adev->delayed_init_work);
 
+	/* disable ras feature must before hw fini */
+	amdgpu_ras_pre_fini(adev);
 	amdgpu_ras_suspend(adev);
 
 	amdgpu_device_ip_suspend_phase1(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 040969d56541..bc90035ee25b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -4064,42 +4064,50 @@ int amdgpu_ras_late_init(struct amdgpu_device *adev)
 int amdgpu_ras_pre_fini(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct amdgpu_ras_block_list *node, *tmp;
+	struct amdgpu_ras_block_object *obj;
 
-	if (!adev->ras_enabled || !con)
-		return 0;
+	if (amdgpu_sriov_vf(adev) && !amdgpu_sriov_ras_telemetry_en(adev))
+		goto disable;
 
+	list_for_each_entry_safe(node, tmp, &adev->ras_list, node) {
+		obj = node->ras_obj;
+		if (!obj) {
+			continue;
+		}
+
+		if (!amdgpu_ras_is_supported(adev, obj->ras_comm.block))
+			continue;
+
+		if (obj->ras_fini) {
+			obj->ras_fini(adev, &obj->ras_comm);
+		} else
+			amdgpu_ras_block_late_fini_default(adev, &obj->ras_comm);
+	}
 
+disable:
 	/* Need disable ras on all IPs here before ip [hw/sw]fini */
-	if (AMDGPU_RAS_GET_FEATURES(con->features))
+	if (con && AMDGPU_RAS_GET_FEATURES(con->features))
 		amdgpu_ras_disable_all_features(adev, 0);
-	amdgpu_ras_recovery_fini(adev);
+
 	return 0;
 }
 
 int amdgpu_ras_fini(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras_block_list *ras_node, *tmp;
-	struct amdgpu_ras_block_object *obj = NULL;
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 
 	if (!adev->ras_enabled || !con)
-		return 0;
+		goto out_free_context;
 
 	list_for_each_entry_safe(ras_node, tmp, &adev->ras_list, node) {
-		if (ras_node->ras_obj) {
-			obj = ras_node->ras_obj;
-			if (amdgpu_ras_is_supported(adev, obj->ras_comm.block) &&
-			    obj->ras_fini)
-				obj->ras_fini(adev, &obj->ras_comm);
-			else
-				amdgpu_ras_block_late_fini_default(adev, &obj->ras_comm);
-		}
-
 		/* Clear ras blocks from ras_list and free ras block list node */
 		list_del(&ras_node->node);
 		kfree(ras_node);
 	}
 
+	amdgpu_ras_recovery_fini(adev);
 	amdgpu_ras_fs_fini(adev);
 	amdgpu_ras_interrupt_remove_all(adev);
 
@@ -4117,8 +4125,11 @@ int amdgpu_ras_fini(struct amdgpu_device *adev)
 
 	cancel_delayed_work_sync(&con->ras_counte_delay_work);
 
-	amdgpu_ras_set_context(adev, NULL);
-	kfree(con);
+out_free_context:
+	if (con) {
+		amdgpu_ras_set_context(adev, NULL);
+		kfree(con);
+	}
 
 	return 0;
 }
-- 
2.43.5