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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2017 Netronome Systems, Inc.
3 * Copyright (C) 2019 Mellanox Technologies. All rights reserved
4 */
5
6#include <linux/completion.h>
7#include <linux/device.h>
8#include <linux/idr.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>
15
16#include "netdevsim.h"
17
18static DEFINE_IDA(nsim_bus_dev_ids);
19static LIST_HEAD(nsim_bus_dev_list);
20static DEFINE_MUTEX(nsim_bus_dev_list_lock);
21static bool nsim_bus_enable;
22static refcount_t nsim_bus_devs; /* Including the bus itself. */
23static DECLARE_COMPLETION(nsim_bus_devs_released);
24
25static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
26{
27 return container_of(dev, struct nsim_bus_dev, dev);
28}
29
30static ssize_t
31nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
32 const char *buf, size_t count)
33{
34 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
35 unsigned int num_vfs;
36 int ret;
37
38 ret = kstrtouint(buf, 0, &num_vfs);
39 if (ret)
40 return ret;
41
42 device_lock(dev);
43 ret = -ENOENT;
44 if (dev_get_drvdata(dev))
45 ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
46 device_unlock(dev);
47
48 return ret ? ret : count;
49}
50
51static ssize_t
52nsim_bus_dev_numvfs_show(struct device *dev,
53 struct device_attribute *attr, char *buf)
54{
55 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
56
57 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
58}
59
60static struct device_attribute nsim_bus_dev_numvfs_attr =
61 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
62 nsim_bus_dev_numvfs_store);
63
64static ssize_t
65new_port_store(struct device *dev, struct device_attribute *attr,
66 const char *buf, size_t count)
67{
68 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
69 unsigned int port_index;
70 int ret;
71
72 /* Prevent to use nsim_bus_dev before initialization. */
73 if (!smp_load_acquire(&nsim_bus_dev->init))
74 return -EBUSY;
75 ret = kstrtouint(buf, 0, &port_index);
76 if (ret)
77 return ret;
78
79 ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
80 return ret ? ret : count;
81}
82
83static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
84
85static ssize_t
86del_port_store(struct device *dev, struct device_attribute *attr,
87 const char *buf, size_t count)
88{
89 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
90 unsigned int port_index;
91 int ret;
92
93 /* Prevent to use nsim_bus_dev before initialization. */
94 if (!smp_load_acquire(&nsim_bus_dev->init))
95 return -EBUSY;
96 ret = kstrtouint(buf, 0, &port_index);
97 if (ret)
98 return ret;
99
100 ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
101 return ret ? ret : count;
102}
103
104static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
105
106static 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,
110 NULL,
111};
112
113static const struct attribute_group nsim_bus_dev_attr_group = {
114 .attrs = nsim_bus_dev_attrs,
115};
116
117static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
118 &nsim_bus_dev_attr_group,
119 NULL,
120};
121
122static void nsim_bus_dev_release(struct device *dev)
123{
124 struct nsim_bus_dev *nsim_bus_dev;
125
126 nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
127 kfree(nsim_bus_dev);
128 if (refcount_dec_and_test(&nsim_bus_devs))
129 complete(&nsim_bus_devs_released);
130}
131
132static struct device_type nsim_bus_dev_type = {
133 .groups = nsim_bus_dev_attr_groups,
134 .release = nsim_bus_dev_release,
135};
136
137static struct nsim_bus_dev *
138nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
139
140static ssize_t
141new_device_store(const struct bus_type *bus, const char *buf, size_t count)
142{
143 unsigned int id, port_count, num_queues;
144 struct nsim_bus_dev *nsim_bus_dev;
145 int err;
146
147 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
148 switch (err) {
149 case 1:
150 port_count = 1;
151 fallthrough;
152 case 2:
153 num_queues = 1;
154 fallthrough;
155 case 3:
156 if (id > INT_MAX) {
157 pr_err("Value of \"id\" is too big.\n");
158 return -EINVAL;
159 }
160 break;
161 default:
162 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
163 return -EINVAL;
164 }
165
166 mutex_lock(&nsim_bus_dev_list_lock);
167 /* Prevent to use resource before initialization. */
168 if (!smp_load_acquire(&nsim_bus_enable)) {
169 err = -EBUSY;
170 goto err;
171 }
172
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);
176 goto err;
177 }
178
179 refcount_inc(&nsim_bus_devs);
180 /* Allow using nsim_bus_dev */
181 smp_store_release(&nsim_bus_dev->init, true);
182
183 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
184 mutex_unlock(&nsim_bus_dev_list_lock);
185
186 return count;
187err:
188 mutex_unlock(&nsim_bus_dev_list_lock);
189 return err;
190}
191static BUS_ATTR_WO(new_device);
192
193static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
194
195static ssize_t
196del_device_store(const struct bus_type *bus, const char *buf, size_t count)
197{
198 struct nsim_bus_dev *nsim_bus_dev, *tmp;
199 unsigned int id;
200 int err;
201
202 err = sscanf(buf, "%u", &id);
203 switch (err) {
204 case 1:
205 if (id > INT_MAX) {
206 pr_err("Value of \"id\" is too big.\n");
207 return -EINVAL;
208 }
209 break;
210 default:
211 pr_err("Format for deleting device is \"id\" (uint).\n");
212 return -EINVAL;
213 }
214
215 err = -ENOENT;
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);
220 return -EBUSY;
221 }
222 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
223 if (nsim_bus_dev->dev.id != id)
224 continue;
225 list_del(&nsim_bus_dev->list);
226 nsim_bus_dev_del(nsim_bus_dev);
227 err = 0;
228 break;
229 }
230 mutex_unlock(&nsim_bus_dev_list_lock);
231 return !err ? count : err;
232}
233static BUS_ATTR_WO(del_device);
234
235static struct attribute *nsim_bus_attrs[] = {
236 &bus_attr_new_device.attr,
237 &bus_attr_del_device.attr,
238 NULL
239};
240ATTRIBUTE_GROUPS(nsim_bus);
241
242static int nsim_bus_probe(struct device *dev)
243{
244 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
245
246 return nsim_drv_probe(nsim_bus_dev);
247}
248
249static void nsim_bus_remove(struct device *dev)
250{
251 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
252
253 nsim_drv_remove(nsim_bus_dev);
254}
255
256static int nsim_num_vf(struct device *dev)
257{
258 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
259
260 return nsim_bus_dev->num_vfs;
261}
262
263static struct bus_type nsim_bus = {
264 .name = DRV_NAME,
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,
270};
271
272#define NSIM_BUS_DEV_MAX_VFS 4
273
274static struct nsim_bus_dev *
275nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
276{
277 struct nsim_bus_dev *nsim_bus_dev;
278 int err;
279
280 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
281 if (!nsim_bus_dev)
282 return ERR_PTR(-ENOMEM);
283
284 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
285 if (err < 0)
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);
296
297 err = device_register(&nsim_bus_dev->dev);
298 if (err)
299 goto err_nsim_bus_dev_id_free;
300
301 return nsim_bus_dev;
302
303err_nsim_bus_dev_id_free:
304 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
305 put_device(&nsim_bus_dev->dev);
306 nsim_bus_dev = NULL;
307err_nsim_bus_dev_free:
308 kfree(nsim_bus_dev);
309 return ERR_PTR(err);
310}
311
312static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
313{
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);
318}
319
320static struct device_driver nsim_driver = {
321 .name = DRV_NAME,
322 .bus = &nsim_bus,
323 .owner = THIS_MODULE,
324};
325
326int nsim_bus_init(void)
327{
328 int err;
329
330 err = bus_register(&nsim_bus);
331 if (err)
332 return err;
333 err = driver_register(&nsim_driver);
334 if (err)
335 goto err_bus_unregister;
336 refcount_set(&nsim_bus_devs, 1);
337 /* Allow using resources */
338 smp_store_release(&nsim_bus_enable, true);
339 return 0;
340
341err_bus_unregister:
342 bus_unregister(&nsim_bus);
343 return err;
344}
345
346void nsim_bus_exit(void)
347{
348 struct nsim_bus_dev *nsim_bus_dev, *tmp;
349
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);
354
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);
359 }
360 mutex_unlock(&nsim_bus_dev_list_lock);
361
362 wait_for_completion(&nsim_bus_devs_released);
363
364 driver_unregister(&nsim_driver);
365 bus_unregister(&nsim_bus);
366}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2017 Netronome Systems, Inc.
3 * Copyright (C) 2019 Mellanox Technologies. All rights reserved
4 */
5
6#include <linux/device.h>
7#include <linux/idr.h>
8#include <linux/kernel.h>
9#include <linux/list.h>
10#include <linux/mutex.h>
11#include <linux/slab.h>
12#include <linux/sysfs.h>
13
14#include "netdevsim.h"
15
16static DEFINE_IDA(nsim_bus_dev_ids);
17static LIST_HEAD(nsim_bus_dev_list);
18static DEFINE_MUTEX(nsim_bus_dev_list_lock);
19static bool nsim_bus_enable;
20
21static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
22{
23 return container_of(dev, struct nsim_bus_dev, dev);
24}
25
26static ssize_t
27nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
28 const char *buf, size_t count)
29{
30 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
31 unsigned int num_vfs;
32 int ret;
33
34 ret = kstrtouint(buf, 0, &num_vfs);
35 if (ret)
36 return ret;
37
38 device_lock(dev);
39 ret = -ENOENT;
40 if (dev_get_drvdata(dev))
41 ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
42 device_unlock(dev);
43
44 return ret ? ret : count;
45}
46
47static ssize_t
48nsim_bus_dev_numvfs_show(struct device *dev,
49 struct device_attribute *attr, char *buf)
50{
51 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
52
53 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
54}
55
56static struct device_attribute nsim_bus_dev_numvfs_attr =
57 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
58 nsim_bus_dev_numvfs_store);
59
60static ssize_t
61new_port_store(struct device *dev, struct device_attribute *attr,
62 const char *buf, size_t count)
63{
64 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
65 unsigned int port_index;
66 int ret;
67
68 /* Prevent to use nsim_bus_dev before initialization. */
69 if (!smp_load_acquire(&nsim_bus_dev->init))
70 return -EBUSY;
71 ret = kstrtouint(buf, 0, &port_index);
72 if (ret)
73 return ret;
74
75 ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
76 return ret ? ret : count;
77}
78
79static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
80
81static ssize_t
82del_port_store(struct device *dev, struct device_attribute *attr,
83 const char *buf, size_t count)
84{
85 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
86 unsigned int port_index;
87 int ret;
88
89 /* Prevent to use nsim_bus_dev before initialization. */
90 if (!smp_load_acquire(&nsim_bus_dev->init))
91 return -EBUSY;
92 ret = kstrtouint(buf, 0, &port_index);
93 if (ret)
94 return ret;
95
96 ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
97 return ret ? ret : count;
98}
99
100static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
101
102static struct attribute *nsim_bus_dev_attrs[] = {
103 &nsim_bus_dev_numvfs_attr.attr,
104 &nsim_bus_dev_new_port_attr.attr,
105 &nsim_bus_dev_del_port_attr.attr,
106 NULL,
107};
108
109static const struct attribute_group nsim_bus_dev_attr_group = {
110 .attrs = nsim_bus_dev_attrs,
111};
112
113static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
114 &nsim_bus_dev_attr_group,
115 NULL,
116};
117
118static void nsim_bus_dev_release(struct device *dev)
119{
120 struct nsim_bus_dev *nsim_bus_dev;
121
122 nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
123 kfree(nsim_bus_dev);
124}
125
126static struct device_type nsim_bus_dev_type = {
127 .groups = nsim_bus_dev_attr_groups,
128 .release = nsim_bus_dev_release,
129};
130
131static struct nsim_bus_dev *
132nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
133
134static ssize_t
135new_device_store(struct bus_type *bus, const char *buf, size_t count)
136{
137 unsigned int id, port_count, num_queues;
138 struct nsim_bus_dev *nsim_bus_dev;
139 int err;
140
141 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
142 switch (err) {
143 case 1:
144 port_count = 1;
145 fallthrough;
146 case 2:
147 num_queues = 1;
148 fallthrough;
149 case 3:
150 if (id > INT_MAX) {
151 pr_err("Value of \"id\" is too big.\n");
152 return -EINVAL;
153 }
154 break;
155 default:
156 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
157 return -EINVAL;
158 }
159
160 mutex_lock(&nsim_bus_dev_list_lock);
161 /* Prevent to use resource before initialization. */
162 if (!smp_load_acquire(&nsim_bus_enable)) {
163 err = -EBUSY;
164 goto err;
165 }
166
167 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
168 if (IS_ERR(nsim_bus_dev)) {
169 err = PTR_ERR(nsim_bus_dev);
170 goto err;
171 }
172
173 /* Allow using nsim_bus_dev */
174 smp_store_release(&nsim_bus_dev->init, true);
175
176 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
177 mutex_unlock(&nsim_bus_dev_list_lock);
178
179 return count;
180err:
181 mutex_unlock(&nsim_bus_dev_list_lock);
182 return err;
183}
184static BUS_ATTR_WO(new_device);
185
186static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
187
188static ssize_t
189del_device_store(struct bus_type *bus, const char *buf, size_t count)
190{
191 struct nsim_bus_dev *nsim_bus_dev, *tmp;
192 unsigned int id;
193 int err;
194
195 err = sscanf(buf, "%u", &id);
196 switch (err) {
197 case 1:
198 if (id > INT_MAX) {
199 pr_err("Value of \"id\" is too big.\n");
200 return -EINVAL;
201 }
202 break;
203 default:
204 pr_err("Format for deleting device is \"id\" (uint).\n");
205 return -EINVAL;
206 }
207
208 err = -ENOENT;
209 mutex_lock(&nsim_bus_dev_list_lock);
210 /* Prevent to use resource before initialization. */
211 if (!smp_load_acquire(&nsim_bus_enable)) {
212 mutex_unlock(&nsim_bus_dev_list_lock);
213 return -EBUSY;
214 }
215 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
216 if (nsim_bus_dev->dev.id != id)
217 continue;
218 list_del(&nsim_bus_dev->list);
219 nsim_bus_dev_del(nsim_bus_dev);
220 err = 0;
221 break;
222 }
223 mutex_unlock(&nsim_bus_dev_list_lock);
224 return !err ? count : err;
225}
226static BUS_ATTR_WO(del_device);
227
228static struct attribute *nsim_bus_attrs[] = {
229 &bus_attr_new_device.attr,
230 &bus_attr_del_device.attr,
231 NULL
232};
233ATTRIBUTE_GROUPS(nsim_bus);
234
235static int nsim_bus_probe(struct device *dev)
236{
237 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
238
239 return nsim_drv_probe(nsim_bus_dev);
240}
241
242static void nsim_bus_remove(struct device *dev)
243{
244 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
245
246 nsim_drv_remove(nsim_bus_dev);
247}
248
249static int nsim_num_vf(struct device *dev)
250{
251 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
252
253 return nsim_bus_dev->num_vfs;
254}
255
256static struct bus_type nsim_bus = {
257 .name = DRV_NAME,
258 .dev_name = DRV_NAME,
259 .bus_groups = nsim_bus_groups,
260 .probe = nsim_bus_probe,
261 .remove = nsim_bus_remove,
262 .num_vf = nsim_num_vf,
263};
264
265#define NSIM_BUS_DEV_MAX_VFS 4
266
267static struct nsim_bus_dev *
268nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
269{
270 struct nsim_bus_dev *nsim_bus_dev;
271 int err;
272
273 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
274 if (!nsim_bus_dev)
275 return ERR_PTR(-ENOMEM);
276
277 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
278 if (err < 0)
279 goto err_nsim_bus_dev_free;
280 nsim_bus_dev->dev.id = err;
281 nsim_bus_dev->dev.bus = &nsim_bus;
282 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
283 nsim_bus_dev->port_count = port_count;
284 nsim_bus_dev->num_queues = num_queues;
285 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
286 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
287 /* Disallow using nsim_bus_dev */
288 smp_store_release(&nsim_bus_dev->init, false);
289
290 err = device_register(&nsim_bus_dev->dev);
291 if (err)
292 goto err_nsim_bus_dev_id_free;
293
294 return nsim_bus_dev;
295
296err_nsim_bus_dev_id_free:
297 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
298 put_device(&nsim_bus_dev->dev);
299 nsim_bus_dev = NULL;
300err_nsim_bus_dev_free:
301 kfree(nsim_bus_dev);
302 return ERR_PTR(err);
303}
304
305static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
306{
307 /* Disallow using nsim_bus_dev */
308 smp_store_release(&nsim_bus_dev->init, false);
309 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
310 device_unregister(&nsim_bus_dev->dev);
311}
312
313static struct device_driver nsim_driver = {
314 .name = DRV_NAME,
315 .bus = &nsim_bus,
316 .owner = THIS_MODULE,
317};
318
319int nsim_bus_init(void)
320{
321 int err;
322
323 err = bus_register(&nsim_bus);
324 if (err)
325 return err;
326 err = driver_register(&nsim_driver);
327 if (err)
328 goto err_bus_unregister;
329 /* Allow using resources */
330 smp_store_release(&nsim_bus_enable, true);
331 return 0;
332
333err_bus_unregister:
334 bus_unregister(&nsim_bus);
335 return err;
336}
337
338void nsim_bus_exit(void)
339{
340 struct nsim_bus_dev *nsim_bus_dev, *tmp;
341
342 /* Disallow using resources */
343 smp_store_release(&nsim_bus_enable, false);
344
345 mutex_lock(&nsim_bus_dev_list_lock);
346 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
347 list_del(&nsim_bus_dev->list);
348 nsim_bus_dev_del(nsim_bus_dev);
349 }
350 mutex_unlock(&nsim_bus_dev_list_lock);
351
352 driver_unregister(&nsim_driver);
353 bus_unregister(&nsim_bus);
354}