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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/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/rtnetlink.h>
12#include <linux/slab.h>
13#include <linux/sysfs.h>
14
15#include "netdevsim.h"
16
17static DEFINE_IDA(nsim_bus_dev_ids);
18static LIST_HEAD(nsim_bus_dev_list);
19static DEFINE_MUTEX(nsim_bus_dev_list_lock);
20static bool nsim_bus_enable;
21
22static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
23{
24 return container_of(dev, struct nsim_bus_dev, dev);
25}
26
27static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
28 unsigned int num_vfs)
29{
30 struct nsim_dev *nsim_dev;
31 int err = 0;
32
33 if (nsim_bus_dev->max_vfs < num_vfs)
34 return -ENOMEM;
35
36 if (!nsim_bus_dev->vfconfigs)
37 return -ENOMEM;
38 nsim_bus_dev->num_vfs = num_vfs;
39
40 nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
41 if (nsim_esw_mode_is_switchdev(nsim_dev)) {
42 err = nsim_esw_switchdev_enable(nsim_dev, NULL);
43 if (err)
44 nsim_bus_dev->num_vfs = 0;
45 }
46
47 return err;
48}
49
50void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
51{
52 struct nsim_dev *nsim_dev;
53
54 nsim_bus_dev->num_vfs = 0;
55 nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
56 if (nsim_esw_mode_is_switchdev(nsim_dev))
57 nsim_esw_legacy_enable(nsim_dev, NULL);
58}
59
60static ssize_t
61nsim_bus_dev_numvfs_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 num_vfs;
66 int ret;
67
68 ret = kstrtouint(buf, 0, &num_vfs);
69 if (ret)
70 return ret;
71
72 mutex_lock(&nsim_bus_dev->vfs_lock);
73 if (nsim_bus_dev->num_vfs == num_vfs)
74 goto exit_good;
75 if (nsim_bus_dev->num_vfs && num_vfs) {
76 ret = -EBUSY;
77 goto exit_unlock;
78 }
79
80 if (num_vfs) {
81 ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
82 if (ret)
83 goto exit_unlock;
84 } else {
85 nsim_bus_dev_vfs_disable(nsim_bus_dev);
86 }
87exit_good:
88 ret = count;
89exit_unlock:
90 mutex_unlock(&nsim_bus_dev->vfs_lock);
91
92 return ret;
93}
94
95static ssize_t
96nsim_bus_dev_numvfs_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
98{
99 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
100
101 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
102}
103
104static struct device_attribute nsim_bus_dev_numvfs_attr =
105 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
106 nsim_bus_dev_numvfs_store);
107
108ssize_t nsim_bus_dev_max_vfs_read(struct file *file,
109 char __user *data,
110 size_t count, loff_t *ppos)
111{
112 struct nsim_bus_dev *nsim_bus_dev = file->private_data;
113 char buf[11];
114 ssize_t len;
115
116 len = snprintf(buf, sizeof(buf), "%u\n", nsim_bus_dev->max_vfs);
117 if (len < 0)
118 return len;
119
120 return simple_read_from_buffer(data, count, ppos, buf, len);
121}
122
123ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
124 const char __user *data,
125 size_t count, loff_t *ppos)
126{
127 struct nsim_bus_dev *nsim_bus_dev = file->private_data;
128 struct nsim_vf_config *vfconfigs;
129 ssize_t ret;
130 char buf[10];
131 u32 val;
132
133 if (*ppos != 0)
134 return 0;
135
136 if (count >= sizeof(buf))
137 return -ENOSPC;
138
139 mutex_lock(&nsim_bus_dev->vfs_lock);
140 /* Reject if VFs are configured */
141 if (nsim_bus_dev->num_vfs) {
142 ret = -EBUSY;
143 goto unlock;
144 }
145
146 ret = copy_from_user(buf, data, count);
147 if (ret) {
148 ret = -EFAULT;
149 goto unlock;
150 }
151
152 buf[count] = '\0';
153 ret = kstrtouint(buf, 10, &val);
154 if (ret) {
155 ret = -EIO;
156 goto unlock;
157 }
158
159 /* max_vfs limited by the maximum number of provided port indexes */
160 if (val > NSIM_DEV_VF_PORT_INDEX_MAX - NSIM_DEV_VF_PORT_INDEX_BASE) {
161 ret = -ERANGE;
162 goto unlock;
163 }
164
165 vfconfigs = kcalloc(val, sizeof(struct nsim_vf_config), GFP_KERNEL | __GFP_NOWARN);
166 if (!vfconfigs) {
167 ret = -ENOMEM;
168 goto unlock;
169 }
170
171 kfree(nsim_bus_dev->vfconfigs);
172 nsim_bus_dev->vfconfigs = vfconfigs;
173 nsim_bus_dev->max_vfs = val;
174 *ppos += count;
175 ret = count;
176unlock:
177 mutex_unlock(&nsim_bus_dev->vfs_lock);
178 return ret;
179}
180
181static ssize_t
182new_port_store(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
184{
185 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
186 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
187 struct devlink *devlink;
188 unsigned int port_index;
189 int ret;
190
191 /* Prevent to use nsim_bus_dev before initialization. */
192 if (!smp_load_acquire(&nsim_bus_dev->init))
193 return -EBUSY;
194 ret = kstrtouint(buf, 0, &port_index);
195 if (ret)
196 return ret;
197
198 devlink = priv_to_devlink(nsim_dev);
199
200 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
201 devlink_reload_disable(devlink);
202 ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
203 devlink_reload_enable(devlink);
204 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
205 return ret ? ret : count;
206}
207
208static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
209
210static ssize_t
211del_port_store(struct device *dev, struct device_attribute *attr,
212 const char *buf, size_t count)
213{
214 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
215 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
216 struct devlink *devlink;
217 unsigned int port_index;
218 int ret;
219
220 /* Prevent to use nsim_bus_dev before initialization. */
221 if (!smp_load_acquire(&nsim_bus_dev->init))
222 return -EBUSY;
223 ret = kstrtouint(buf, 0, &port_index);
224 if (ret)
225 return ret;
226
227 devlink = priv_to_devlink(nsim_dev);
228
229 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
230 devlink_reload_disable(devlink);
231 ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
232 devlink_reload_enable(devlink);
233 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
234 return ret ? ret : count;
235}
236
237static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
238
239static struct attribute *nsim_bus_dev_attrs[] = {
240 &nsim_bus_dev_numvfs_attr.attr,
241 &nsim_bus_dev_new_port_attr.attr,
242 &nsim_bus_dev_del_port_attr.attr,
243 NULL,
244};
245
246static const struct attribute_group nsim_bus_dev_attr_group = {
247 .attrs = nsim_bus_dev_attrs,
248};
249
250static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
251 &nsim_bus_dev_attr_group,
252 NULL,
253};
254
255static void nsim_bus_dev_release(struct device *dev)
256{
257}
258
259static struct device_type nsim_bus_dev_type = {
260 .groups = nsim_bus_dev_attr_groups,
261 .release = nsim_bus_dev_release,
262};
263
264static struct nsim_bus_dev *
265nsim_bus_dev_new(unsigned int id, unsigned int port_count);
266
267static ssize_t
268new_device_store(struct bus_type *bus, const char *buf, size_t count)
269{
270 struct nsim_bus_dev *nsim_bus_dev;
271 unsigned int port_count;
272 unsigned int id;
273 int err;
274
275 err = sscanf(buf, "%u %u", &id, &port_count);
276 switch (err) {
277 case 1:
278 port_count = 1;
279 fallthrough;
280 case 2:
281 if (id > INT_MAX) {
282 pr_err("Value of \"id\" is too big.\n");
283 return -EINVAL;
284 }
285 break;
286 default:
287 pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
288 return -EINVAL;
289 }
290
291 mutex_lock(&nsim_bus_dev_list_lock);
292 /* Prevent to use resource before initialization. */
293 if (!smp_load_acquire(&nsim_bus_enable)) {
294 err = -EBUSY;
295 goto err;
296 }
297
298 nsim_bus_dev = nsim_bus_dev_new(id, port_count);
299 if (IS_ERR(nsim_bus_dev)) {
300 err = PTR_ERR(nsim_bus_dev);
301 goto err;
302 }
303
304 /* Allow using nsim_bus_dev */
305 smp_store_release(&nsim_bus_dev->init, true);
306
307 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
308 mutex_unlock(&nsim_bus_dev_list_lock);
309
310 return count;
311err:
312 mutex_unlock(&nsim_bus_dev_list_lock);
313 return err;
314}
315static BUS_ATTR_WO(new_device);
316
317static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
318
319static ssize_t
320del_device_store(struct bus_type *bus, const char *buf, size_t count)
321{
322 struct nsim_bus_dev *nsim_bus_dev, *tmp;
323 unsigned int id;
324 int err;
325
326 err = sscanf(buf, "%u", &id);
327 switch (err) {
328 case 1:
329 if (id > INT_MAX) {
330 pr_err("Value of \"id\" is too big.\n");
331 return -EINVAL;
332 }
333 break;
334 default:
335 pr_err("Format for deleting device is \"id\" (uint).\n");
336 return -EINVAL;
337 }
338
339 err = -ENOENT;
340 mutex_lock(&nsim_bus_dev_list_lock);
341 /* Prevent to use resource before initialization. */
342 if (!smp_load_acquire(&nsim_bus_enable)) {
343 mutex_unlock(&nsim_bus_dev_list_lock);
344 return -EBUSY;
345 }
346 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
347 if (nsim_bus_dev->dev.id != id)
348 continue;
349 list_del(&nsim_bus_dev->list);
350 nsim_bus_dev_del(nsim_bus_dev);
351 err = 0;
352 break;
353 }
354 mutex_unlock(&nsim_bus_dev_list_lock);
355 return !err ? count : err;
356}
357static BUS_ATTR_WO(del_device);
358
359static struct attribute *nsim_bus_attrs[] = {
360 &bus_attr_new_device.attr,
361 &bus_attr_del_device.attr,
362 NULL
363};
364ATTRIBUTE_GROUPS(nsim_bus);
365
366static int nsim_bus_probe(struct device *dev)
367{
368 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
369
370 return nsim_dev_probe(nsim_bus_dev);
371}
372
373static int nsim_bus_remove(struct device *dev)
374{
375 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
376
377 nsim_dev_remove(nsim_bus_dev);
378 return 0;
379}
380
381static int nsim_num_vf(struct device *dev)
382{
383 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
384
385 return nsim_bus_dev->num_vfs;
386}
387
388static struct bus_type nsim_bus = {
389 .name = DRV_NAME,
390 .dev_name = DRV_NAME,
391 .bus_groups = nsim_bus_groups,
392 .probe = nsim_bus_probe,
393 .remove = nsim_bus_remove,
394 .num_vf = nsim_num_vf,
395};
396
397#define NSIM_BUS_DEV_MAX_VFS 4
398
399static struct nsim_bus_dev *
400nsim_bus_dev_new(unsigned int id, unsigned int port_count)
401{
402 struct nsim_bus_dev *nsim_bus_dev;
403 int err;
404
405 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
406 if (!nsim_bus_dev)
407 return ERR_PTR(-ENOMEM);
408
409 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
410 if (err < 0)
411 goto err_nsim_bus_dev_free;
412 nsim_bus_dev->dev.id = err;
413 nsim_bus_dev->dev.bus = &nsim_bus;
414 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
415 nsim_bus_dev->port_count = port_count;
416 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
417 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
418 mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
419 mutex_init(&nsim_bus_dev->vfs_lock);
420 /* Disallow using nsim_bus_dev */
421 smp_store_release(&nsim_bus_dev->init, false);
422
423 nsim_bus_dev->vfconfigs = kcalloc(nsim_bus_dev->max_vfs,
424 sizeof(struct nsim_vf_config),
425 GFP_KERNEL | __GFP_NOWARN);
426 if (!nsim_bus_dev->vfconfigs) {
427 err = -ENOMEM;
428 goto err_nsim_bus_dev_id_free;
429 }
430
431 err = device_register(&nsim_bus_dev->dev);
432 if (err)
433 goto err_nsim_vfs_free;
434
435 return nsim_bus_dev;
436
437err_nsim_vfs_free:
438 kfree(nsim_bus_dev->vfconfigs);
439err_nsim_bus_dev_id_free:
440 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
441err_nsim_bus_dev_free:
442 kfree(nsim_bus_dev);
443 return ERR_PTR(err);
444}
445
446static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
447{
448 /* Disallow using nsim_bus_dev */
449 smp_store_release(&nsim_bus_dev->init, false);
450 device_unregister(&nsim_bus_dev->dev);
451 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
452 kfree(nsim_bus_dev->vfconfigs);
453 kfree(nsim_bus_dev);
454}
455
456static struct device_driver nsim_driver = {
457 .name = DRV_NAME,
458 .bus = &nsim_bus,
459 .owner = THIS_MODULE,
460};
461
462int nsim_bus_init(void)
463{
464 int err;
465
466 err = bus_register(&nsim_bus);
467 if (err)
468 return err;
469 err = driver_register(&nsim_driver);
470 if (err)
471 goto err_bus_unregister;
472 /* Allow using resources */
473 smp_store_release(&nsim_bus_enable, true);
474 return 0;
475
476err_bus_unregister:
477 bus_unregister(&nsim_bus);
478 return err;
479}
480
481void nsim_bus_exit(void)
482{
483 struct nsim_bus_dev *nsim_bus_dev, *tmp;
484
485 /* Disallow using resources */
486 smp_store_release(&nsim_bus_enable, false);
487
488 mutex_lock(&nsim_bus_dev_list_lock);
489 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
490 list_del(&nsim_bus_dev->list);
491 nsim_bus_dev_del(nsim_bus_dev);
492 }
493 mutex_unlock(&nsim_bus_dev_list_lock);
494
495 driver_unregister(&nsim_driver);
496 bus_unregister(&nsim_bus);
497}
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/rtnetlink.h>
12#include <linux/slab.h>
13#include <linux/sysfs.h>
14
15#include "netdevsim.h"
16
17static DEFINE_IDA(nsim_bus_dev_ids);
18static LIST_HEAD(nsim_bus_dev_list);
19static DEFINE_MUTEX(nsim_bus_dev_list_lock);
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 int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
27 unsigned int num_vfs)
28{
29 nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
30 sizeof(struct nsim_vf_config),
31 GFP_KERNEL);
32 if (!nsim_bus_dev->vfconfigs)
33 return -ENOMEM;
34 nsim_bus_dev->num_vfs = num_vfs;
35
36 return 0;
37}
38
39static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
40{
41 kfree(nsim_bus_dev->vfconfigs);
42 nsim_bus_dev->vfconfigs = NULL;
43 nsim_bus_dev->num_vfs = 0;
44}
45
46static ssize_t
47nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
48 const char *buf, size_t count)
49{
50 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
51 unsigned int num_vfs;
52 int ret;
53
54 ret = kstrtouint(buf, 0, &num_vfs);
55 if (ret)
56 return ret;
57
58 rtnl_lock();
59 if (nsim_bus_dev->num_vfs == num_vfs)
60 goto exit_good;
61 if (nsim_bus_dev->num_vfs && num_vfs) {
62 ret = -EBUSY;
63 goto exit_unlock;
64 }
65
66 if (num_vfs) {
67 ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
68 if (ret)
69 goto exit_unlock;
70 } else {
71 nsim_bus_dev_vfs_disable(nsim_bus_dev);
72 }
73exit_good:
74 ret = count;
75exit_unlock:
76 rtnl_unlock();
77
78 return ret;
79}
80
81static ssize_t
82nsim_bus_dev_numvfs_show(struct device *dev,
83 struct device_attribute *attr, char *buf)
84{
85 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
86
87 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
88}
89
90static struct device_attribute nsim_bus_dev_numvfs_attr =
91 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
92 nsim_bus_dev_numvfs_store);
93
94static ssize_t
95new_port_store(struct device *dev, struct device_attribute *attr,
96 const char *buf, size_t count)
97{
98 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
99 unsigned int port_index;
100 int ret;
101
102 ret = kstrtouint(buf, 0, &port_index);
103 if (ret)
104 return ret;
105 ret = nsim_dev_port_add(nsim_bus_dev, port_index);
106 return ret ? ret : count;
107}
108
109static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
110
111static ssize_t
112del_port_store(struct device *dev, struct device_attribute *attr,
113 const char *buf, size_t count)
114{
115 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
116 unsigned int port_index;
117 int ret;
118
119 ret = kstrtouint(buf, 0, &port_index);
120 if (ret)
121 return ret;
122 ret = nsim_dev_port_del(nsim_bus_dev, port_index);
123 return ret ? ret : count;
124}
125
126static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
127
128static struct attribute *nsim_bus_dev_attrs[] = {
129 &nsim_bus_dev_numvfs_attr.attr,
130 &nsim_bus_dev_new_port_attr.attr,
131 &nsim_bus_dev_del_port_attr.attr,
132 NULL,
133};
134
135static const struct attribute_group nsim_bus_dev_attr_group = {
136 .attrs = nsim_bus_dev_attrs,
137};
138
139static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
140 &nsim_bus_dev_attr_group,
141 NULL,
142};
143
144static void nsim_bus_dev_release(struct device *dev)
145{
146 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
147
148 nsim_bus_dev_vfs_disable(nsim_bus_dev);
149}
150
151static struct device_type nsim_bus_dev_type = {
152 .groups = nsim_bus_dev_attr_groups,
153 .release = nsim_bus_dev_release,
154};
155
156static struct nsim_bus_dev *
157nsim_bus_dev_new(unsigned int id, unsigned int port_count);
158
159static ssize_t
160new_device_store(struct bus_type *bus, const char *buf, size_t count)
161{
162 struct nsim_bus_dev *nsim_bus_dev;
163 unsigned int port_count;
164 unsigned int id;
165 int err;
166
167 err = sscanf(buf, "%u %u", &id, &port_count);
168 switch (err) {
169 case 1:
170 port_count = 1;
171 /* fall through */
172 case 2:
173 if (id > INT_MAX) {
174 pr_err("Value of \"id\" is too big.\n");
175 return -EINVAL;
176 }
177 break;
178 default:
179 pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
180 return -EINVAL;
181 }
182 nsim_bus_dev = nsim_bus_dev_new(id, port_count);
183 if (IS_ERR(nsim_bus_dev))
184 return PTR_ERR(nsim_bus_dev);
185
186 mutex_lock(&nsim_bus_dev_list_lock);
187 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
188 mutex_unlock(&nsim_bus_dev_list_lock);
189
190 return count;
191}
192static BUS_ATTR_WO(new_device);
193
194static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
195
196static ssize_t
197del_device_store(struct bus_type *bus, const char *buf, size_t count)
198{
199 struct nsim_bus_dev *nsim_bus_dev, *tmp;
200 unsigned int id;
201 int err;
202
203 err = sscanf(buf, "%u", &id);
204 switch (err) {
205 case 1:
206 if (id > INT_MAX) {
207 pr_err("Value of \"id\" is too big.\n");
208 return -EINVAL;
209 }
210 break;
211 default:
212 pr_err("Format for deleting device is \"id\" (uint).\n");
213 return -EINVAL;
214 }
215
216 err = -ENOENT;
217 mutex_lock(&nsim_bus_dev_list_lock);
218 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
219 if (nsim_bus_dev->dev.id != id)
220 continue;
221 list_del(&nsim_bus_dev->list);
222 nsim_bus_dev_del(nsim_bus_dev);
223 err = 0;
224 break;
225 }
226 mutex_unlock(&nsim_bus_dev_list_lock);
227 return !err ? count : err;
228}
229static BUS_ATTR_WO(del_device);
230
231static struct attribute *nsim_bus_attrs[] = {
232 &bus_attr_new_device.attr,
233 &bus_attr_del_device.attr,
234 NULL
235};
236ATTRIBUTE_GROUPS(nsim_bus);
237
238static int nsim_bus_probe(struct device *dev)
239{
240 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
241
242 return nsim_dev_probe(nsim_bus_dev);
243}
244
245static int nsim_bus_remove(struct device *dev)
246{
247 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
248
249 nsim_dev_remove(nsim_bus_dev);
250 return 0;
251}
252
253static int nsim_num_vf(struct device *dev)
254{
255 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
256
257 return nsim_bus_dev->num_vfs;
258}
259
260static struct bus_type nsim_bus = {
261 .name = DRV_NAME,
262 .dev_name = DRV_NAME,
263 .bus_groups = nsim_bus_groups,
264 .probe = nsim_bus_probe,
265 .remove = nsim_bus_remove,
266 .num_vf = nsim_num_vf,
267};
268
269static struct nsim_bus_dev *
270nsim_bus_dev_new(unsigned int id, unsigned int port_count)
271{
272 struct nsim_bus_dev *nsim_bus_dev;
273 int err;
274
275 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
276 if (!nsim_bus_dev)
277 return ERR_PTR(-ENOMEM);
278
279 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
280 if (err < 0)
281 goto err_nsim_bus_dev_free;
282 nsim_bus_dev->dev.id = err;
283 nsim_bus_dev->dev.bus = &nsim_bus;
284 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
285 nsim_bus_dev->port_count = port_count;
286
287 err = device_register(&nsim_bus_dev->dev);
288 if (err)
289 goto err_nsim_bus_dev_id_free;
290 return nsim_bus_dev;
291
292err_nsim_bus_dev_id_free:
293 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
294err_nsim_bus_dev_free:
295 kfree(nsim_bus_dev);
296 return ERR_PTR(err);
297}
298
299static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
300{
301 device_unregister(&nsim_bus_dev->dev);
302 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
303 kfree(nsim_bus_dev);
304}
305
306static struct device_driver nsim_driver = {
307 .name = DRV_NAME,
308 .bus = &nsim_bus,
309 .owner = THIS_MODULE,
310};
311
312int nsim_bus_init(void)
313{
314 int err;
315
316 err = bus_register(&nsim_bus);
317 if (err)
318 return err;
319 err = driver_register(&nsim_driver);
320 if (err)
321 goto err_bus_unregister;
322 return 0;
323
324err_bus_unregister:
325 bus_unregister(&nsim_bus);
326 return err;
327}
328
329void nsim_bus_exit(void)
330{
331 struct nsim_bus_dev *nsim_bus_dev, *tmp;
332
333 mutex_lock(&nsim_bus_dev_list_lock);
334 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
335 list_del(&nsim_bus_dev->list);
336 nsim_bus_dev_del(nsim_bus_dev);
337 }
338 mutex_unlock(&nsim_bus_dev_list_lock);
339 driver_unregister(&nsim_driver);
340 bus_unregister(&nsim_bus);
341}