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bc38a6ab RD |
1 | /* |
2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. | |
3 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
2a1d9b7f RD |
4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
5 | * Copyright (c) 2005 Voltaire, Inc. All rights reserved. | |
bc38a6ab RD |
6 | * |
7 | * This software is available to you under a choice of one of two | |
8 | * licenses. You may choose to be licensed under the terms of the GNU | |
9 | * General Public License (GPL) Version 2, available from the file | |
10 | * COPYING in the main directory of this source tree, or the | |
11 | * OpenIB.org BSD license below: | |
12 | * | |
13 | * Redistribution and use in source and binary forms, with or | |
14 | * without modification, are permitted provided that the following | |
15 | * conditions are met: | |
16 | * | |
17 | * - Redistributions of source code must retain the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer. | |
20 | * | |
21 | * - Redistributions in binary form must reproduce the above | |
22 | * copyright notice, this list of conditions and the following | |
23 | * disclaimer in the documentation and/or other materials | |
24 | * provided with the distribution. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
27 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
28 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
29 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
30 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
31 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
32 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
33 | * SOFTWARE. | |
34 | * | |
35 | * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $ | |
36 | */ | |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/fs.h> | |
43 | #include <linux/poll.h> | |
44 | #include <linux/file.h> | |
45 | #include <linux/mount.h> | |
46 | ||
47 | #include <asm/uaccess.h> | |
48 | ||
49 | #include "uverbs.h" | |
50 | ||
51 | MODULE_AUTHOR("Roland Dreier"); | |
52 | MODULE_DESCRIPTION("InfiniBand userspace verbs access"); | |
53 | MODULE_LICENSE("Dual BSD/GPL"); | |
54 | ||
55 | #define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */ | |
56 | ||
57 | enum { | |
58 | IB_UVERBS_MAJOR = 231, | |
59 | IB_UVERBS_BASE_MINOR = 192, | |
60 | IB_UVERBS_MAX_DEVICES = 32 | |
61 | }; | |
62 | ||
63 | #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) | |
64 | ||
65 | DECLARE_MUTEX(ib_uverbs_idr_mutex); | |
66 | DEFINE_IDR(ib_uverbs_pd_idr); | |
67 | DEFINE_IDR(ib_uverbs_mr_idr); | |
68 | DEFINE_IDR(ib_uverbs_mw_idr); | |
69 | DEFINE_IDR(ib_uverbs_ah_idr); | |
70 | DEFINE_IDR(ib_uverbs_cq_idr); | |
71 | DEFINE_IDR(ib_uverbs_qp_idr); | |
72 | ||
73 | static spinlock_t map_lock; | |
74 | static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); | |
75 | ||
76 | static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, | |
77 | const char __user *buf, int in_len, | |
78 | int out_len) = { | |
79 | [IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params, | |
80 | [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, | |
81 | [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, | |
82 | [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, | |
83 | [IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid, | |
84 | [IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey, | |
85 | [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, | |
86 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, | |
87 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, | |
88 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, | |
89 | [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, | |
90 | [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, | |
91 | [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, | |
92 | [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, | |
93 | [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, | |
94 | [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, | |
95 | [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, | |
96 | }; | |
97 | ||
98 | static struct vfsmount *uverbs_event_mnt; | |
99 | ||
100 | static void ib_uverbs_add_one(struct ib_device *device); | |
101 | static void ib_uverbs_remove_one(struct ib_device *device); | |
102 | ||
103 | static int ib_dealloc_ucontext(struct ib_ucontext *context) | |
104 | { | |
105 | struct ib_uobject *uobj, *tmp; | |
106 | ||
107 | if (!context) | |
108 | return 0; | |
109 | ||
110 | down(&ib_uverbs_idr_mutex); | |
111 | ||
112 | /* XXX Free AHs */ | |
113 | ||
114 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { | |
115 | struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); | |
116 | idr_remove(&ib_uverbs_qp_idr, uobj->id); | |
117 | ib_destroy_qp(qp); | |
118 | list_del(&uobj->list); | |
119 | kfree(uobj); | |
120 | } | |
121 | ||
122 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { | |
123 | struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); | |
124 | idr_remove(&ib_uverbs_cq_idr, uobj->id); | |
125 | ib_destroy_cq(cq); | |
126 | list_del(&uobj->list); | |
127 | kfree(uobj); | |
128 | } | |
129 | ||
130 | /* XXX Free SRQs */ | |
131 | /* XXX Free MWs */ | |
132 | ||
133 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { | |
134 | struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); | |
e1bcfcaa | 135 | struct ib_device *mrdev = mr->device; |
bc38a6ab RD |
136 | struct ib_umem_object *memobj; |
137 | ||
138 | idr_remove(&ib_uverbs_mr_idr, uobj->id); | |
139 | ib_dereg_mr(mr); | |
140 | ||
141 | memobj = container_of(uobj, struct ib_umem_object, uobject); | |
e1bcfcaa | 142 | ib_umem_release_on_close(mrdev, &memobj->umem); |
bc38a6ab RD |
143 | |
144 | list_del(&uobj->list); | |
145 | kfree(memobj); | |
146 | } | |
147 | ||
148 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { | |
149 | struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); | |
150 | idr_remove(&ib_uverbs_pd_idr, uobj->id); | |
151 | ib_dealloc_pd(pd); | |
152 | list_del(&uobj->list); | |
153 | kfree(uobj); | |
154 | } | |
155 | ||
156 | up(&ib_uverbs_idr_mutex); | |
157 | ||
158 | return context->device->dealloc_ucontext(context); | |
159 | } | |
160 | ||
161 | static void ib_uverbs_release_file(struct kref *ref) | |
162 | { | |
163 | struct ib_uverbs_file *file = | |
164 | container_of(ref, struct ib_uverbs_file, ref); | |
165 | ||
166 | module_put(file->device->ib_dev->owner); | |
167 | kfree(file); | |
168 | } | |
169 | ||
170 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, | |
171 | size_t count, loff_t *pos) | |
172 | { | |
173 | struct ib_uverbs_event_file *file = filp->private_data; | |
174 | void *event; | |
175 | int eventsz; | |
176 | int ret = 0; | |
177 | ||
178 | spin_lock_irq(&file->lock); | |
179 | ||
180 | while (list_empty(&file->event_list) && file->fd >= 0) { | |
181 | spin_unlock_irq(&file->lock); | |
182 | ||
183 | if (filp->f_flags & O_NONBLOCK) | |
184 | return -EAGAIN; | |
185 | ||
186 | if (wait_event_interruptible(file->poll_wait, | |
187 | !list_empty(&file->event_list) || | |
188 | file->fd < 0)) | |
189 | return -ERESTARTSYS; | |
190 | ||
191 | spin_lock_irq(&file->lock); | |
192 | } | |
193 | ||
194 | if (file->fd < 0) { | |
195 | spin_unlock_irq(&file->lock); | |
196 | return -ENODEV; | |
197 | } | |
198 | ||
199 | if (file->is_async) { | |
200 | event = list_entry(file->event_list.next, | |
201 | struct ib_uverbs_async_event, list); | |
202 | eventsz = sizeof (struct ib_uverbs_async_event_desc); | |
203 | } else { | |
204 | event = list_entry(file->event_list.next, | |
205 | struct ib_uverbs_comp_event, list); | |
206 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); | |
207 | } | |
208 | ||
209 | if (eventsz > count) { | |
210 | ret = -EINVAL; | |
211 | event = NULL; | |
212 | } else | |
213 | list_del(file->event_list.next); | |
214 | ||
215 | spin_unlock_irq(&file->lock); | |
216 | ||
217 | if (event) { | |
218 | if (copy_to_user(buf, event, eventsz)) | |
219 | ret = -EFAULT; | |
220 | else | |
221 | ret = eventsz; | |
222 | } | |
223 | ||
224 | kfree(event); | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | static unsigned int ib_uverbs_event_poll(struct file *filp, | |
230 | struct poll_table_struct *wait) | |
231 | { | |
232 | unsigned int pollflags = 0; | |
233 | struct ib_uverbs_event_file *file = filp->private_data; | |
234 | ||
235 | poll_wait(filp, &file->poll_wait, wait); | |
236 | ||
237 | spin_lock_irq(&file->lock); | |
238 | if (file->fd < 0) | |
239 | pollflags = POLLERR; | |
240 | else if (!list_empty(&file->event_list)) | |
241 | pollflags = POLLIN | POLLRDNORM; | |
242 | spin_unlock_irq(&file->lock); | |
243 | ||
244 | return pollflags; | |
245 | } | |
246 | ||
247 | static void ib_uverbs_event_release(struct ib_uverbs_event_file *file) | |
248 | { | |
249 | struct list_head *entry, *tmp; | |
250 | ||
251 | spin_lock_irq(&file->lock); | |
252 | if (file->fd != -1) { | |
253 | file->fd = -1; | |
254 | list_for_each_safe(entry, tmp, &file->event_list) | |
255 | if (file->is_async) | |
256 | kfree(list_entry(entry, struct ib_uverbs_async_event, list)); | |
257 | else | |
258 | kfree(list_entry(entry, struct ib_uverbs_comp_event, list)); | |
259 | } | |
260 | spin_unlock_irq(&file->lock); | |
261 | } | |
262 | ||
abdf119b GN |
263 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
264 | { | |
265 | struct ib_uverbs_event_file *file = filp->private_data; | |
266 | ||
267 | return fasync_helper(fd, filp, on, &file->async_queue); | |
268 | } | |
269 | ||
bc38a6ab RD |
270 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
271 | { | |
272 | struct ib_uverbs_event_file *file = filp->private_data; | |
273 | ||
274 | ib_uverbs_event_release(file); | |
abdf119b | 275 | ib_uverbs_event_fasync(-1, filp, 0); |
bc38a6ab RD |
276 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static struct file_operations uverbs_event_fops = { | |
282 | /* | |
283 | * No .owner field since we artificially create event files, | |
284 | * so there is no increment to the module reference count in | |
285 | * the open path. All event files come from a uverbs command | |
286 | * file, which already takes a module reference, so this is OK. | |
287 | */ | |
288 | .read = ib_uverbs_event_read, | |
289 | .poll = ib_uverbs_event_poll, | |
abdf119b GN |
290 | .release = ib_uverbs_event_close, |
291 | .fasync = ib_uverbs_event_fasync | |
bc38a6ab RD |
292 | }; |
293 | ||
294 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
295 | { | |
296 | struct ib_uverbs_file *file = cq_context; | |
297 | struct ib_uverbs_comp_event *entry; | |
298 | unsigned long flags; | |
299 | ||
300 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
301 | if (!entry) | |
302 | return; | |
303 | ||
304 | entry->desc.cq_handle = cq->uobject->user_handle; | |
305 | ||
306 | spin_lock_irqsave(&file->comp_file[0].lock, flags); | |
307 | list_add_tail(&entry->list, &file->comp_file[0].event_list); | |
308 | spin_unlock_irqrestore(&file->comp_file[0].lock, flags); | |
309 | ||
310 | wake_up_interruptible(&file->comp_file[0].poll_wait); | |
abdf119b | 311 | kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN); |
bc38a6ab RD |
312 | } |
313 | ||
314 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, | |
315 | __u64 element, __u64 event) | |
316 | { | |
317 | struct ib_uverbs_async_event *entry; | |
318 | unsigned long flags; | |
319 | ||
320 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
321 | if (!entry) | |
322 | return; | |
323 | ||
324 | entry->desc.element = element; | |
325 | entry->desc.event_type = event; | |
326 | ||
327 | spin_lock_irqsave(&file->async_file.lock, flags); | |
328 | list_add_tail(&entry->list, &file->async_file.event_list); | |
329 | spin_unlock_irqrestore(&file->async_file.lock, flags); | |
330 | ||
331 | wake_up_interruptible(&file->async_file.poll_wait); | |
abdf119b | 332 | kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN); |
bc38a6ab RD |
333 | } |
334 | ||
335 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) | |
336 | { | |
337 | ib_uverbs_async_handler(context_ptr, | |
338 | event->element.cq->uobject->user_handle, | |
339 | event->event); | |
340 | } | |
341 | ||
342 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
343 | { | |
344 | ib_uverbs_async_handler(context_ptr, | |
345 | event->element.qp->uobject->user_handle, | |
346 | event->event); | |
347 | } | |
348 | ||
349 | static void ib_uverbs_event_handler(struct ib_event_handler *handler, | |
350 | struct ib_event *event) | |
351 | { | |
352 | struct ib_uverbs_file *file = | |
353 | container_of(handler, struct ib_uverbs_file, event_handler); | |
354 | ||
355 | ib_uverbs_async_handler(file, event->element.port_num, event->event); | |
356 | } | |
357 | ||
358 | static int ib_uverbs_event_init(struct ib_uverbs_event_file *file, | |
359 | struct ib_uverbs_file *uverbs_file) | |
360 | { | |
361 | struct file *filp; | |
362 | ||
363 | spin_lock_init(&file->lock); | |
364 | INIT_LIST_HEAD(&file->event_list); | |
365 | init_waitqueue_head(&file->poll_wait); | |
366 | file->uverbs_file = uverbs_file; | |
abdf119b | 367 | file->async_queue = NULL; |
bc38a6ab RD |
368 | |
369 | file->fd = get_unused_fd(); | |
370 | if (file->fd < 0) | |
371 | return file->fd; | |
372 | ||
373 | filp = get_empty_filp(); | |
374 | if (!filp) { | |
375 | put_unused_fd(file->fd); | |
376 | return -ENFILE; | |
377 | } | |
378 | ||
379 | filp->f_op = &uverbs_event_fops; | |
380 | filp->f_vfsmnt = mntget(uverbs_event_mnt); | |
381 | filp->f_dentry = dget(uverbs_event_mnt->mnt_root); | |
382 | filp->f_mapping = filp->f_dentry->d_inode->i_mapping; | |
383 | filp->f_flags = O_RDONLY; | |
384 | filp->f_mode = FMODE_READ; | |
385 | filp->private_data = file; | |
386 | ||
387 | fd_install(file->fd, filp); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, | |
393 | size_t count, loff_t *pos) | |
394 | { | |
395 | struct ib_uverbs_file *file = filp->private_data; | |
396 | struct ib_uverbs_cmd_hdr hdr; | |
397 | ||
398 | if (count < sizeof hdr) | |
399 | return -EINVAL; | |
400 | ||
401 | if (copy_from_user(&hdr, buf, sizeof hdr)) | |
402 | return -EFAULT; | |
403 | ||
404 | if (hdr.in_words * 4 != count) | |
405 | return -EINVAL; | |
406 | ||
407 | if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table)) | |
408 | return -EINVAL; | |
409 | ||
410 | if (!file->ucontext && | |
411 | hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS && | |
412 | hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) | |
413 | return -EINVAL; | |
414 | ||
415 | return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, | |
416 | hdr.in_words * 4, hdr.out_words * 4); | |
417 | } | |
418 | ||
419 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) | |
420 | { | |
421 | struct ib_uverbs_file *file = filp->private_data; | |
422 | ||
423 | if (!file->ucontext) | |
424 | return -ENODEV; | |
425 | else | |
426 | return file->device->ib_dev->mmap(file->ucontext, vma); | |
427 | } | |
428 | ||
429 | static int ib_uverbs_open(struct inode *inode, struct file *filp) | |
430 | { | |
431 | struct ib_uverbs_device *dev = | |
432 | container_of(inode->i_cdev, struct ib_uverbs_device, dev); | |
433 | struct ib_uverbs_file *file; | |
434 | int i = 0; | |
435 | int ret; | |
436 | ||
437 | if (!try_module_get(dev->ib_dev->owner)) | |
438 | return -ENODEV; | |
439 | ||
440 | file = kmalloc(sizeof *file + | |
441 | (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file), | |
442 | GFP_KERNEL); | |
443 | if (!file) | |
444 | return -ENOMEM; | |
445 | ||
446 | file->device = dev; | |
447 | kref_init(&file->ref); | |
448 | ||
449 | file->ucontext = NULL; | |
450 | ||
451 | ret = ib_uverbs_event_init(&file->async_file, file); | |
452 | if (ret) | |
453 | goto err; | |
454 | ||
455 | file->async_file.is_async = 1; | |
456 | ||
457 | kref_get(&file->ref); | |
458 | ||
459 | for (i = 0; i < dev->num_comp; ++i) { | |
460 | ret = ib_uverbs_event_init(&file->comp_file[i], file); | |
461 | if (ret) | |
462 | goto err_async; | |
463 | kref_get(&file->ref); | |
464 | file->comp_file[i].is_async = 0; | |
465 | } | |
466 | ||
467 | ||
468 | filp->private_data = file; | |
469 | ||
470 | INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev, | |
471 | ib_uverbs_event_handler); | |
472 | if (ib_register_event_handler(&file->event_handler)) | |
473 | goto err_async; | |
474 | ||
475 | return 0; | |
476 | ||
477 | err_async: | |
478 | while (i--) | |
479 | ib_uverbs_event_release(&file->comp_file[i]); | |
480 | ||
481 | ib_uverbs_event_release(&file->async_file); | |
482 | ||
483 | err: | |
484 | kref_put(&file->ref, ib_uverbs_release_file); | |
485 | ||
486 | return ret; | |
487 | } | |
488 | ||
489 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
490 | { | |
491 | struct ib_uverbs_file *file = filp->private_data; | |
492 | int i; | |
493 | ||
494 | ib_unregister_event_handler(&file->event_handler); | |
495 | ib_uverbs_event_release(&file->async_file); | |
496 | ib_dealloc_ucontext(file->ucontext); | |
497 | ||
498 | for (i = 0; i < file->device->num_comp; ++i) | |
499 | ib_uverbs_event_release(&file->comp_file[i]); | |
500 | ||
501 | kref_put(&file->ref, ib_uverbs_release_file); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static struct file_operations uverbs_fops = { | |
507 | .owner = THIS_MODULE, | |
508 | .write = ib_uverbs_write, | |
509 | .open = ib_uverbs_open, | |
510 | .release = ib_uverbs_close | |
511 | }; | |
512 | ||
513 | static struct file_operations uverbs_mmap_fops = { | |
514 | .owner = THIS_MODULE, | |
515 | .write = ib_uverbs_write, | |
516 | .mmap = ib_uverbs_mmap, | |
517 | .open = ib_uverbs_open, | |
518 | .release = ib_uverbs_close | |
519 | }; | |
520 | ||
521 | static struct ib_client uverbs_client = { | |
522 | .name = "uverbs", | |
523 | .add = ib_uverbs_add_one, | |
524 | .remove = ib_uverbs_remove_one | |
525 | }; | |
526 | ||
527 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
528 | { | |
529 | struct ib_uverbs_device *dev = | |
530 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
531 | ||
532 | return sprintf(buf, "%s\n", dev->ib_dev->name); | |
533 | } | |
534 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
535 | ||
536 | static void ib_uverbs_release_class_dev(struct class_device *class_dev) | |
537 | { | |
538 | struct ib_uverbs_device *dev = | |
539 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
540 | ||
541 | cdev_del(&dev->dev); | |
542 | clear_bit(dev->devnum, dev_map); | |
543 | kfree(dev); | |
544 | } | |
545 | ||
546 | static struct class uverbs_class = { | |
547 | .name = "infiniband_verbs", | |
548 | .release = ib_uverbs_release_class_dev | |
549 | }; | |
550 | ||
551 | static ssize_t show_abi_version(struct class *class, char *buf) | |
552 | { | |
553 | return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); | |
554 | } | |
555 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
556 | ||
557 | static void ib_uverbs_add_one(struct ib_device *device) | |
558 | { | |
559 | struct ib_uverbs_device *uverbs_dev; | |
560 | ||
561 | if (!device->alloc_ucontext) | |
562 | return; | |
563 | ||
564 | uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL); | |
565 | if (!uverbs_dev) | |
566 | return; | |
567 | ||
568 | memset(uverbs_dev, 0, sizeof *uverbs_dev); | |
569 | ||
570 | spin_lock(&map_lock); | |
571 | uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); | |
572 | if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { | |
573 | spin_unlock(&map_lock); | |
574 | goto err; | |
575 | } | |
576 | set_bit(uverbs_dev->devnum, dev_map); | |
577 | spin_unlock(&map_lock); | |
578 | ||
579 | uverbs_dev->ib_dev = device; | |
580 | uverbs_dev->num_comp = 1; | |
581 | ||
582 | if (device->mmap) | |
583 | cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops); | |
584 | else | |
585 | cdev_init(&uverbs_dev->dev, &uverbs_fops); | |
586 | uverbs_dev->dev.owner = THIS_MODULE; | |
587 | kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum); | |
588 | if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) | |
589 | goto err; | |
590 | ||
591 | uverbs_dev->class_dev.class = &uverbs_class; | |
592 | uverbs_dev->class_dev.dev = device->dma_device; | |
593 | uverbs_dev->class_dev.devt = uverbs_dev->dev.dev; | |
594 | snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum); | |
595 | if (class_device_register(&uverbs_dev->class_dev)) | |
596 | goto err_cdev; | |
597 | ||
598 | if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev)) | |
599 | goto err_class; | |
600 | ||
601 | ib_set_client_data(device, &uverbs_client, uverbs_dev); | |
602 | ||
603 | return; | |
604 | ||
605 | err_class: | |
606 | class_device_unregister(&uverbs_dev->class_dev); | |
607 | ||
608 | err_cdev: | |
609 | cdev_del(&uverbs_dev->dev); | |
610 | clear_bit(uverbs_dev->devnum, dev_map); | |
611 | ||
612 | err: | |
613 | kfree(uverbs_dev); | |
614 | return; | |
615 | } | |
616 | ||
617 | static void ib_uverbs_remove_one(struct ib_device *device) | |
618 | { | |
619 | struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); | |
620 | ||
621 | if (!uverbs_dev) | |
622 | return; | |
623 | ||
624 | class_device_unregister(&uverbs_dev->class_dev); | |
625 | } | |
626 | ||
627 | static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, | |
628 | const char *dev_name, void *data) | |
629 | { | |
630 | return get_sb_pseudo(fs_type, "infinibandevent:", NULL, | |
631 | INFINIBANDEVENTFS_MAGIC); | |
632 | } | |
633 | ||
634 | static struct file_system_type uverbs_event_fs = { | |
635 | /* No owner field so module can be unloaded */ | |
636 | .name = "infinibandeventfs", | |
637 | .get_sb = uverbs_event_get_sb, | |
638 | .kill_sb = kill_litter_super | |
639 | }; | |
640 | ||
641 | static int __init ib_uverbs_init(void) | |
642 | { | |
643 | int ret; | |
644 | ||
645 | spin_lock_init(&map_lock); | |
646 | ||
647 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, | |
648 | "infiniband_verbs"); | |
649 | if (ret) { | |
650 | printk(KERN_ERR "user_verbs: couldn't register device number\n"); | |
651 | goto out; | |
652 | } | |
653 | ||
654 | ret = class_register(&uverbs_class); | |
655 | if (ret) { | |
656 | printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); | |
657 | goto out_chrdev; | |
658 | } | |
659 | ||
660 | ret = class_create_file(&uverbs_class, &class_attr_abi_version); | |
661 | if (ret) { | |
662 | printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); | |
663 | goto out_class; | |
664 | } | |
665 | ||
666 | ret = register_filesystem(&uverbs_event_fs); | |
667 | if (ret) { | |
668 | printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); | |
669 | goto out_class; | |
670 | } | |
671 | ||
672 | uverbs_event_mnt = kern_mount(&uverbs_event_fs); | |
673 | if (IS_ERR(uverbs_event_mnt)) { | |
674 | ret = PTR_ERR(uverbs_event_mnt); | |
675 | printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); | |
676 | goto out_fs; | |
677 | } | |
678 | ||
679 | ret = ib_register_client(&uverbs_client); | |
680 | if (ret) { | |
681 | printk(KERN_ERR "user_verbs: couldn't register client\n"); | |
682 | goto out_mnt; | |
683 | } | |
684 | ||
685 | return 0; | |
686 | ||
687 | out_mnt: | |
688 | mntput(uverbs_event_mnt); | |
689 | ||
690 | out_fs: | |
691 | unregister_filesystem(&uverbs_event_fs); | |
692 | ||
693 | out_class: | |
694 | class_unregister(&uverbs_class); | |
695 | ||
696 | out_chrdev: | |
697 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
698 | ||
699 | out: | |
700 | return ret; | |
701 | } | |
702 | ||
703 | static void __exit ib_uverbs_cleanup(void) | |
704 | { | |
705 | ib_unregister_client(&uverbs_client); | |
706 | mntput(uverbs_event_mnt); | |
707 | unregister_filesystem(&uverbs_event_fs); | |
708 | class_unregister(&uverbs_class); | |
709 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
710 | } | |
711 | ||
712 | module_init(ib_uverbs_init); | |
713 | module_exit(ib_uverbs_cleanup); |