[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/iommu/iommu-sysfs.c b/src/kernel/linux/v4.14/drivers/iommu/iommu-sysfs.c
new file mode 100644
index 0000000..36d1a7c
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/iommu/iommu-sysfs.c
@@ -0,0 +1,133 @@
+/*
+ * IOMMU sysfs class support
+ *
+ * Copyright (C) 2014 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+/*
+ * We provide a common class "devices" group which initially has no attributes.
+ * As devices are added to the IOMMU, we'll add links to the group.
+ */
+static struct attribute *devices_attr[] = {
+ NULL,
+};
+
+static const struct attribute_group iommu_devices_attr_group = {
+ .name = "devices",
+ .attrs = devices_attr,
+};
+
+static const struct attribute_group *iommu_dev_groups[] = {
+ &iommu_devices_attr_group,
+ NULL,
+};
+
+static void iommu_release_device(struct device *dev)
+{
+ kfree(dev);
+}
+
+static struct class iommu_class = {
+ .name = "iommu",
+ .dev_release = iommu_release_device,
+ .dev_groups = iommu_dev_groups,
+};
+
+static int __init iommu_dev_init(void)
+{
+ return class_register(&iommu_class);
+}
+postcore_initcall(iommu_dev_init);
+
+/*
+ * Init the struct device for the IOMMU. IOMMU specific attributes can
+ * be provided as an attribute group, allowing a unique namespace per
+ * IOMMU type.
+ */
+int iommu_device_sysfs_add(struct iommu_device *iommu,
+ struct device *parent,
+ const struct attribute_group **groups,
+ const char *fmt, ...)
+{
+ va_list vargs;
+ int ret;
+
+ iommu->dev = kzalloc(sizeof(*iommu->dev), GFP_KERNEL);
+ if (!iommu->dev)
+ return -ENOMEM;
+
+ device_initialize(iommu->dev);
+
+ iommu->dev->class = &iommu_class;
+ iommu->dev->parent = parent;
+ iommu->dev->groups = groups;
+
+ va_start(vargs, fmt);
+ ret = kobject_set_name_vargs(&iommu->dev->kobj, fmt, vargs);
+ va_end(vargs);
+ if (ret)
+ goto error;
+
+ ret = device_add(iommu->dev);
+ if (ret)
+ goto error;
+
+ dev_set_drvdata(iommu->dev, iommu);
+
+ return 0;
+
+error:
+ put_device(iommu->dev);
+ return ret;
+}
+
+void iommu_device_sysfs_remove(struct iommu_device *iommu)
+{
+ dev_set_drvdata(iommu->dev, NULL);
+ device_unregister(iommu->dev);
+ iommu->dev = NULL;
+}
+/*
+ * IOMMU drivers can indicate a device is managed by a given IOMMU using
+ * this interface. A link to the device will be created in the "devices"
+ * directory of the IOMMU device in sysfs and an "iommu" link will be
+ * created under the linked device, pointing back at the IOMMU device.
+ */
+int iommu_device_link(struct iommu_device *iommu, struct device *link)
+{
+ int ret;
+
+ if (!iommu || IS_ERR(iommu))
+ return -ENODEV;
+
+ ret = sysfs_add_link_to_group(&iommu->dev->kobj, "devices",
+ &link->kobj, dev_name(link));
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_link_nowarn(&link->kobj, &iommu->dev->kobj, "iommu");
+ if (ret)
+ sysfs_remove_link_from_group(&iommu->dev->kobj, "devices",
+ dev_name(link));
+
+ return ret;
+}
+
+void iommu_device_unlink(struct iommu_device *iommu, struct device *link)
+{
+ if (!iommu || IS_ERR(iommu))
+ return;
+
+ sysfs_remove_link(&link->kobj, "iommu");
+ sysfs_remove_link_from_group(&iommu->dev->kobj, "devices", dev_name(link));
+}