1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2017 Netronome Systems, Inc.
3 * Copyright (C) 2019 Mellanox Technologies. All rights reserved
6 #include <linux/completion.h>
7 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/list.h>
11 #include <linux/mutex.h>
12 #include <linux/refcount.h>
13 #include <linux/slab.h>
14 #include <linux/sysfs.h>
16 #include "netdevsim.h"
18 static DEFINE_IDA(nsim_bus_dev_ids);
19 static LIST_HEAD(nsim_bus_dev_list);
20 static DEFINE_MUTEX(nsim_bus_dev_list_lock);
21 static bool nsim_bus_enable;
22 static refcount_t nsim_bus_devs; /* Including the bus itself. */
23 static DECLARE_COMPLETION(nsim_bus_devs_released);
25 static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
27 return container_of(dev, struct nsim_bus_dev, dev);
31 nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
32 const char *buf, size_t count)
34 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
38 ret = kstrtouint(buf, 0, &num_vfs);
44 if (dev_get_drvdata(dev))
45 ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
48 return ret ? ret : count;
52 nsim_bus_dev_numvfs_show(struct device *dev,
53 struct device_attribute *attr, char *buf)
55 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
57 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
60 static struct device_attribute nsim_bus_dev_numvfs_attr =
61 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
62 nsim_bus_dev_numvfs_store);
65 new_port_store(struct device *dev, struct device_attribute *attr,
66 const char *buf, size_t count)
68 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
69 unsigned int port_index;
72 /* Prevent to use nsim_bus_dev before initialization. */
73 if (!smp_load_acquire(&nsim_bus_dev->init))
75 ret = kstrtouint(buf, 0, &port_index);
79 ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
80 return ret ? ret : count;
83 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
86 del_port_store(struct device *dev, struct device_attribute *attr,
87 const char *buf, size_t count)
89 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
90 unsigned int port_index;
93 /* Prevent to use nsim_bus_dev before initialization. */
94 if (!smp_load_acquire(&nsim_bus_dev->init))
96 ret = kstrtouint(buf, 0, &port_index);
100 ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
101 return ret ? ret : count;
104 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
106 static struct attribute *nsim_bus_dev_attrs[] = {
107 &nsim_bus_dev_numvfs_attr.attr,
108 &nsim_bus_dev_new_port_attr.attr,
109 &nsim_bus_dev_del_port_attr.attr,
113 static const struct attribute_group nsim_bus_dev_attr_group = {
114 .attrs = nsim_bus_dev_attrs,
117 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
118 &nsim_bus_dev_attr_group,
122 static void nsim_bus_dev_release(struct device *dev)
124 struct nsim_bus_dev *nsim_bus_dev;
126 nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
128 if (refcount_dec_and_test(&nsim_bus_devs))
129 complete(&nsim_bus_devs_released);
132 static struct device_type nsim_bus_dev_type = {
133 .groups = nsim_bus_dev_attr_groups,
134 .release = nsim_bus_dev_release,
137 static struct nsim_bus_dev *
138 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
141 new_device_store(const struct bus_type *bus, const char *buf, size_t count)
143 unsigned int id, port_count, num_queues;
144 struct nsim_bus_dev *nsim_bus_dev;
147 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
157 pr_err("Value of \"id\" is too big.\n");
162 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
166 mutex_lock(&nsim_bus_dev_list_lock);
167 /* Prevent to use resource before initialization. */
168 if (!smp_load_acquire(&nsim_bus_enable)) {
173 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
174 if (IS_ERR(nsim_bus_dev)) {
175 err = PTR_ERR(nsim_bus_dev);
179 refcount_inc(&nsim_bus_devs);
180 /* Allow using nsim_bus_dev */
181 smp_store_release(&nsim_bus_dev->init, true);
183 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
184 mutex_unlock(&nsim_bus_dev_list_lock);
188 mutex_unlock(&nsim_bus_dev_list_lock);
191 static BUS_ATTR_WO(new_device);
193 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
196 del_device_store(const struct bus_type *bus, const char *buf, size_t count)
198 struct nsim_bus_dev *nsim_bus_dev, *tmp;
202 err = sscanf(buf, "%u", &id);
206 pr_err("Value of \"id\" is too big.\n");
211 pr_err("Format for deleting device is \"id\" (uint).\n");
216 mutex_lock(&nsim_bus_dev_list_lock);
217 /* Prevent to use resource before initialization. */
218 if (!smp_load_acquire(&nsim_bus_enable)) {
219 mutex_unlock(&nsim_bus_dev_list_lock);
222 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
223 if (nsim_bus_dev->dev.id != id)
225 list_del(&nsim_bus_dev->list);
226 nsim_bus_dev_del(nsim_bus_dev);
230 mutex_unlock(&nsim_bus_dev_list_lock);
231 return !err ? count : err;
233 static BUS_ATTR_WO(del_device);
235 static struct attribute *nsim_bus_attrs[] = {
236 &bus_attr_new_device.attr,
237 &bus_attr_del_device.attr,
240 ATTRIBUTE_GROUPS(nsim_bus);
242 static int nsim_bus_probe(struct device *dev)
244 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
246 return nsim_drv_probe(nsim_bus_dev);
249 static void nsim_bus_remove(struct device *dev)
251 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
253 nsim_drv_remove(nsim_bus_dev);
256 static int nsim_num_vf(struct device *dev)
258 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
260 return nsim_bus_dev->num_vfs;
263 static struct bus_type nsim_bus = {
265 .dev_name = DRV_NAME,
266 .bus_groups = nsim_bus_groups,
267 .probe = nsim_bus_probe,
268 .remove = nsim_bus_remove,
269 .num_vf = nsim_num_vf,
272 #define NSIM_BUS_DEV_MAX_VFS 4
274 static struct nsim_bus_dev *
275 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
277 struct nsim_bus_dev *nsim_bus_dev;
280 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
282 return ERR_PTR(-ENOMEM);
284 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
286 goto err_nsim_bus_dev_free;
287 nsim_bus_dev->dev.id = err;
288 nsim_bus_dev->dev.bus = &nsim_bus;
289 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
290 nsim_bus_dev->port_count = port_count;
291 nsim_bus_dev->num_queues = num_queues;
292 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
293 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
294 /* Disallow using nsim_bus_dev */
295 smp_store_release(&nsim_bus_dev->init, false);
297 err = device_register(&nsim_bus_dev->dev);
299 goto err_nsim_bus_dev_id_free;
303 err_nsim_bus_dev_id_free:
304 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
305 put_device(&nsim_bus_dev->dev);
307 err_nsim_bus_dev_free:
312 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
314 /* Disallow using nsim_bus_dev */
315 smp_store_release(&nsim_bus_dev->init, false);
316 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
317 device_unregister(&nsim_bus_dev->dev);
320 static struct device_driver nsim_driver = {
323 .owner = THIS_MODULE,
326 int nsim_bus_init(void)
330 err = bus_register(&nsim_bus);
333 err = driver_register(&nsim_driver);
335 goto err_bus_unregister;
336 refcount_set(&nsim_bus_devs, 1);
337 /* Allow using resources */
338 smp_store_release(&nsim_bus_enable, true);
342 bus_unregister(&nsim_bus);
346 void nsim_bus_exit(void)
348 struct nsim_bus_dev *nsim_bus_dev, *tmp;
350 /* Disallow using resources */
351 smp_store_release(&nsim_bus_enable, false);
352 if (refcount_dec_and_test(&nsim_bus_devs))
353 complete(&nsim_bus_devs_released);
355 mutex_lock(&nsim_bus_dev_list_lock);
356 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
357 list_del(&nsim_bus_dev->list);
358 nsim_bus_dev_del(nsim_bus_dev);
360 mutex_unlock(&nsim_bus_dev_list_lock);
362 wait_for_completion(&nsim_bus_devs_released);
364 driver_unregister(&nsim_driver);
365 bus_unregister(&nsim_bus);