Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
new file mode 100644
index 0000000..1a0ff3d
--- /dev/null
+++ b/drivers/net/netdevsim/bus.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2017 Netronome Systems, Inc.
+ * Copyright (C) 2019 Mellanox Technologies. All rights reserved
+ */
+
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#include "netdevsim.h"
+
+static DEFINE_IDA(nsim_bus_dev_ids);
+static LIST_HEAD(nsim_bus_dev_list);
+static DEFINE_MUTEX(nsim_bus_dev_list_lock);
+
+static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
+{
+ return container_of(dev, struct nsim_bus_dev, dev);
+}
+
+static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
+ unsigned int num_vfs)
+{
+ nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
+ sizeof(struct nsim_vf_config),
+ GFP_KERNEL);
+ if (!nsim_bus_dev->vfconfigs)
+ return -ENOMEM;
+ nsim_bus_dev->num_vfs = num_vfs;
+
+ return 0;
+}
+
+static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
+{
+ kfree(nsim_bus_dev->vfconfigs);
+ nsim_bus_dev->vfconfigs = NULL;
+ nsim_bus_dev->num_vfs = 0;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+ unsigned int num_vfs;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &num_vfs);
+ if (ret)
+ return ret;
+
+ rtnl_lock();
+ if (nsim_bus_dev->num_vfs == num_vfs)
+ goto exit_good;
+ if (nsim_bus_dev->num_vfs && num_vfs) {
+ ret = -EBUSY;
+ goto exit_unlock;
+ }
+
+ if (num_vfs) {
+ ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
+ if (ret)
+ goto exit_unlock;
+ } else {
+ nsim_bus_dev_vfs_disable(nsim_bus_dev);
+ }
+exit_good:
+ ret = count;
+exit_unlock:
+ rtnl_unlock();
+
+ return ret;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
+}
+
+static struct device_attribute nsim_bus_dev_numvfs_attr =
+ __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
+ nsim_bus_dev_numvfs_store);
+
+static ssize_t
+new_port_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+ unsigned int port_index;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &port_index);
+ if (ret)
+ return ret;
+ ret = nsim_dev_port_add(nsim_bus_dev, port_index);
+ return ret ? ret : count;
+}
+
+static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
+
+static ssize_t
+del_port_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+ unsigned int port_index;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &port_index);
+ if (ret)
+ return ret;
+ ret = nsim_dev_port_del(nsim_bus_dev, port_index);
+ return ret ? ret : count;
+}
+
+static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
+
+static struct attribute *nsim_bus_dev_attrs[] = {
+ &nsim_bus_dev_numvfs_attr.attr,
+ &nsim_bus_dev_new_port_attr.attr,
+ &nsim_bus_dev_del_port_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group nsim_bus_dev_attr_group = {
+ .attrs = nsim_bus_dev_attrs,
+};
+
+static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
+ &nsim_bus_dev_attr_group,
+ NULL,
+};
+
+static void nsim_bus_dev_release(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ nsim_bus_dev_vfs_disable(nsim_bus_dev);
+}
+
+static struct device_type nsim_bus_dev_type = {
+ .groups = nsim_bus_dev_attr_groups,
+ .release = nsim_bus_dev_release,
+};
+
+static struct nsim_bus_dev *
+nsim_bus_dev_new(unsigned int id, unsigned int port_count);
+
+static ssize_t
+new_device_store(struct bus_type *bus, const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev;
+ unsigned int port_count;
+ unsigned int id;
+ int err;
+
+ err = sscanf(buf, "%u %u", &id, &port_count);
+ switch (err) {
+ case 1:
+ port_count = 1;
+ /* fall through */
+ case 2:
+ if (id > INT_MAX) {
+ pr_err("Value of \"id\" is too big.\n");
+ return -EINVAL;
+ }
+ break;
+ default:
+ pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
+ return -EINVAL;
+ }
+ nsim_bus_dev = nsim_bus_dev_new(id, port_count);
+ if (IS_ERR(nsim_bus_dev))
+ return PTR_ERR(nsim_bus_dev);
+
+ mutex_lock(&nsim_bus_dev_list_lock);
+ list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
+ mutex_unlock(&nsim_bus_dev_list_lock);
+
+ return count;
+}
+static BUS_ATTR_WO(new_device);
+
+static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
+
+static ssize_t
+del_device_store(struct bus_type *bus, const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev, *tmp;
+ unsigned int id;
+ int err;
+
+ err = sscanf(buf, "%u", &id);
+ switch (err) {
+ case 1:
+ if (id > INT_MAX) {
+ pr_err("Value of \"id\" is too big.\n");
+ return -EINVAL;
+ }
+ break;
+ default:
+ pr_err("Format for deleting device is \"id\" (uint).\n");
+ return -EINVAL;
+ }
+
+ err = -ENOENT;
+ mutex_lock(&nsim_bus_dev_list_lock);
+ list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
+ if (nsim_bus_dev->dev.id != id)
+ continue;
+ list_del(&nsim_bus_dev->list);
+ nsim_bus_dev_del(nsim_bus_dev);
+ err = 0;
+ break;
+ }
+ mutex_unlock(&nsim_bus_dev_list_lock);
+ return !err ? count : err;
+}
+static BUS_ATTR_WO(del_device);
+
+static struct attribute *nsim_bus_attrs[] = {
+ &bus_attr_new_device.attr,
+ &bus_attr_del_device.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(nsim_bus);
+
+static int nsim_bus_probe(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ return nsim_dev_probe(nsim_bus_dev);
+}
+
+static int nsim_bus_remove(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ nsim_dev_remove(nsim_bus_dev);
+ return 0;
+}
+
+static int nsim_num_vf(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ return nsim_bus_dev->num_vfs;
+}
+
+static struct bus_type nsim_bus = {
+ .name = DRV_NAME,
+ .dev_name = DRV_NAME,
+ .bus_groups = nsim_bus_groups,
+ .probe = nsim_bus_probe,
+ .remove = nsim_bus_remove,
+ .num_vf = nsim_num_vf,
+};
+
+static struct nsim_bus_dev *
+nsim_bus_dev_new(unsigned int id, unsigned int port_count)
+{
+ struct nsim_bus_dev *nsim_bus_dev;
+ int err;
+
+ nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
+ if (!nsim_bus_dev)
+ return ERR_PTR(-ENOMEM);
+
+ err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
+ if (err < 0)
+ goto err_nsim_bus_dev_free;
+ nsim_bus_dev->dev.id = err;
+ nsim_bus_dev->dev.bus = &nsim_bus;
+ nsim_bus_dev->dev.type = &nsim_bus_dev_type;
+ nsim_bus_dev->port_count = port_count;
+
+ err = device_register(&nsim_bus_dev->dev);
+ if (err)
+ goto err_nsim_bus_dev_id_free;
+ return nsim_bus_dev;
+
+err_nsim_bus_dev_id_free:
+ ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
+err_nsim_bus_dev_free:
+ kfree(nsim_bus_dev);
+ return ERR_PTR(err);
+}
+
+static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
+{
+ device_unregister(&nsim_bus_dev->dev);
+ ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
+ kfree(nsim_bus_dev);
+}
+
+static struct device_driver nsim_driver = {
+ .name = DRV_NAME,
+ .bus = &nsim_bus,
+ .owner = THIS_MODULE,
+};
+
+int nsim_bus_init(void)
+{
+ int err;
+
+ err = bus_register(&nsim_bus);
+ if (err)
+ return err;
+ err = driver_register(&nsim_driver);
+ if (err)
+ goto err_bus_unregister;
+ return 0;
+
+err_bus_unregister:
+ bus_unregister(&nsim_bus);
+ return err;
+}
+
+void nsim_bus_exit(void)
+{
+ struct nsim_bus_dev *nsim_bus_dev, *tmp;
+
+ mutex_lock(&nsim_bus_dev_list_lock);
+ list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
+ list_del(&nsim_bus_dev->list);
+ nsim_bus_dev_del(nsim_bus_dev);
+ }
+ mutex_unlock(&nsim_bus_dev_list_lock);
+ driver_unregister(&nsim_driver);
+ bus_unregister(&nsim_bus);
+}