drm/amdgpu: decouple sysfs creating of bad page node

Bad page information should not be exposed by sysfs when
bad page retirement is disabled, so decouple it from ras
sysfs group creating, and add one guard before creating.
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -1027,6 +1027,33 @@ static ssize_t amdgpu_ras_sysfs_features_read(struct device *dev,
 	return scnprintf(buf, PAGE_SIZE, "feature mask: 0x%x\n", con->features);
 }
 
+static void amdgpu_ras_sysfs_add_bad_page_node(struct amdgpu_device *adev)
+{
+	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct attribute_group group;
+	struct bin_attribute *bin_attrs[] = {
+		&con->badpages_attr,
+		NULL,
+	};
+
+	con->badpages_attr = (struct bin_attribute) {
+		.attr = {
+			.name = "gpu_vram_bad_pages",
+			.mode = S_IRUGO,
+		},
+		.size = 0,
+		.private = NULL,
+		.read = amdgpu_ras_sysfs_badpages_read,
+	};
+
+	group.name = RAS_FS_NAME;
+	group.bin_attrs = bin_attrs;
+
+	sysfs_bin_attr_init(bin_attrs[0]);
+
+	sysfs_update_group(&adev->dev->kobj, &group);
+}
+
 static int amdgpu_ras_sysfs_create_feature_node(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
@@ -1034,14 +1061,9 @@ static int amdgpu_ras_sysfs_create_feature_node(struct amdgpu_device *adev)
 		&con->features_attr.attr,
 		NULL
 	};
-	struct bin_attribute *bin_attrs[] = {
-		&con->badpages_attr,
-		NULL
-	};
 	struct attribute_group group = {
 		.name = RAS_FS_NAME,
 		.attrs = attrs,
-		.bin_attrs = bin_attrs,
 	};
 
 	con->features_attr = (struct device_attribute) {
@@ -1052,22 +1074,20 @@ static int amdgpu_ras_sysfs_create_feature_node(struct amdgpu_device *adev)
 			.show = amdgpu_ras_sysfs_features_read,
 	};
 
-	con->badpages_attr = (struct bin_attribute) {
-		.attr = {
-			.name = "gpu_vram_bad_pages",
-			.mode = S_IRUGO,
-		},
-		.size = 0,
-		.private = NULL,
-		.read = amdgpu_ras_sysfs_badpages_read,
-	};
-
 	sysfs_attr_init(attrs[0]);
-	sysfs_bin_attr_init(bin_attrs[0]);
 
 	return sysfs_create_group(&adev->dev->kobj, &group);
 }
 
+static void amdgpu_ras_sysfs_remove_bad_page_node(struct amdgpu_device *adev)
+{
+	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+
+	sysfs_remove_file_from_group(&adev->dev->kobj,
+				&con->badpages_attr.attr,
+				RAS_FS_NAME);
+}
+
 static int amdgpu_ras_sysfs_remove_feature_node(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
@@ -1075,14 +1095,9 @@ static int amdgpu_ras_sysfs_remove_feature_node(struct amdgpu_device *adev)
 		&con->features_attr.attr,
 		NULL
 	};
-	struct bin_attribute *bin_attrs[] = {
-		&con->badpages_attr,
-		NULL
-	};
 	struct attribute_group group = {
 		.name = RAS_FS_NAME,
 		.attrs = attrs,
-		.bin_attrs = bin_attrs,
 	};
 
 	sysfs_remove_group(&adev->dev->kobj, &group);
@@ -1151,6 +1166,9 @@ static int amdgpu_ras_sysfs_remove_all(struct amdgpu_device *adev)
 		amdgpu_ras_sysfs_remove(adev, &obj->head);
 	}
 
+	if (amdgpu_bad_page_threshold != 0)
+		amdgpu_ras_sysfs_remove_bad_page_node(adev);
+
 	amdgpu_ras_sysfs_remove_feature_node(adev);
 
 	return 0;
@@ -1278,6 +1296,9 @@ static int amdgpu_ras_fs_init(struct amdgpu_device *adev)
 {
 	amdgpu_ras_sysfs_create_feature_node(adev);
 
+	if (amdgpu_bad_page_threshold != 0)
+		amdgpu_ras_sysfs_add_bad_page_node(adev);
+
 	return 0;
 }