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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); | |
f520ba5a | 72 | DEFINE_IDR(ib_uverbs_srq_idr); |
bc38a6ab RD |
73 | |
74 | static spinlock_t map_lock; | |
75 | static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); | |
76 | ||
77 | static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, | |
78 | const char __user *buf, int in_len, | |
79 | int out_len) = { | |
80 | [IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params, | |
81 | [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, | |
82 | [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, | |
83 | [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, | |
84 | [IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid, | |
85 | [IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey, | |
86 | [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, | |
87 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, | |
88 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, | |
89 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, | |
90 | [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, | |
91 | [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, | |
92 | [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, | |
93 | [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, | |
94 | [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, | |
95 | [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, | |
96 | [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, | |
f520ba5a RD |
97 | [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, |
98 | [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, | |
99 | [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, | |
bc38a6ab RD |
100 | }; |
101 | ||
102 | static struct vfsmount *uverbs_event_mnt; | |
103 | ||
104 | static void ib_uverbs_add_one(struct ib_device *device); | |
105 | static void ib_uverbs_remove_one(struct ib_device *device); | |
106 | ||
107 | static int ib_dealloc_ucontext(struct ib_ucontext *context) | |
108 | { | |
109 | struct ib_uobject *uobj, *tmp; | |
110 | ||
111 | if (!context) | |
112 | return 0; | |
113 | ||
114 | down(&ib_uverbs_idr_mutex); | |
115 | ||
116 | /* XXX Free AHs */ | |
117 | ||
118 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { | |
119 | struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); | |
120 | idr_remove(&ib_uverbs_qp_idr, uobj->id); | |
121 | ib_destroy_qp(qp); | |
122 | list_del(&uobj->list); | |
63aaf647 | 123 | kfree(container_of(uobj, struct ib_uevent_object, uobject)); |
bc38a6ab RD |
124 | } |
125 | ||
126 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { | |
127 | struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); | |
128 | idr_remove(&ib_uverbs_cq_idr, uobj->id); | |
129 | ib_destroy_cq(cq); | |
130 | list_del(&uobj->list); | |
63aaf647 | 131 | kfree(container_of(uobj, struct ib_ucq_object, uobject)); |
bc38a6ab RD |
132 | } |
133 | ||
f520ba5a RD |
134 | list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { |
135 | struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id); | |
136 | idr_remove(&ib_uverbs_srq_idr, uobj->id); | |
137 | ib_destroy_srq(srq); | |
138 | list_del(&uobj->list); | |
63aaf647 | 139 | kfree(container_of(uobj, struct ib_uevent_object, uobject)); |
f520ba5a RD |
140 | } |
141 | ||
bc38a6ab RD |
142 | /* XXX Free MWs */ |
143 | ||
144 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { | |
145 | struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); | |
e1bcfcaa | 146 | struct ib_device *mrdev = mr->device; |
bc38a6ab RD |
147 | struct ib_umem_object *memobj; |
148 | ||
149 | idr_remove(&ib_uverbs_mr_idr, uobj->id); | |
150 | ib_dereg_mr(mr); | |
151 | ||
152 | memobj = container_of(uobj, struct ib_umem_object, uobject); | |
e1bcfcaa | 153 | ib_umem_release_on_close(mrdev, &memobj->umem); |
bc38a6ab RD |
154 | |
155 | list_del(&uobj->list); | |
156 | kfree(memobj); | |
157 | } | |
158 | ||
159 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { | |
160 | struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); | |
161 | idr_remove(&ib_uverbs_pd_idr, uobj->id); | |
162 | ib_dealloc_pd(pd); | |
163 | list_del(&uobj->list); | |
164 | kfree(uobj); | |
165 | } | |
166 | ||
167 | up(&ib_uverbs_idr_mutex); | |
168 | ||
169 | return context->device->dealloc_ucontext(context); | |
170 | } | |
171 | ||
172 | static void ib_uverbs_release_file(struct kref *ref) | |
173 | { | |
174 | struct ib_uverbs_file *file = | |
175 | container_of(ref, struct ib_uverbs_file, ref); | |
176 | ||
177 | module_put(file->device->ib_dev->owner); | |
178 | kfree(file); | |
179 | } | |
180 | ||
181 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, | |
182 | size_t count, loff_t *pos) | |
183 | { | |
184 | struct ib_uverbs_event_file *file = filp->private_data; | |
63aaf647 | 185 | struct ib_uverbs_event *event; |
bc38a6ab RD |
186 | int eventsz; |
187 | int ret = 0; | |
188 | ||
189 | spin_lock_irq(&file->lock); | |
190 | ||
191 | while (list_empty(&file->event_list) && file->fd >= 0) { | |
192 | spin_unlock_irq(&file->lock); | |
193 | ||
194 | if (filp->f_flags & O_NONBLOCK) | |
195 | return -EAGAIN; | |
196 | ||
197 | if (wait_event_interruptible(file->poll_wait, | |
198 | !list_empty(&file->event_list) || | |
199 | file->fd < 0)) | |
200 | return -ERESTARTSYS; | |
201 | ||
202 | spin_lock_irq(&file->lock); | |
203 | } | |
204 | ||
205 | if (file->fd < 0) { | |
206 | spin_unlock_irq(&file->lock); | |
207 | return -ENODEV; | |
208 | } | |
209 | ||
63aaf647 RD |
210 | event = list_entry(file->event_list.next, struct ib_uverbs_event, list); |
211 | ||
212 | if (file->is_async) | |
bc38a6ab | 213 | eventsz = sizeof (struct ib_uverbs_async_event_desc); |
63aaf647 | 214 | else |
bc38a6ab | 215 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); |
bc38a6ab RD |
216 | |
217 | if (eventsz > count) { | |
218 | ret = -EINVAL; | |
219 | event = NULL; | |
63aaf647 | 220 | } else { |
bc38a6ab | 221 | list_del(file->event_list.next); |
63aaf647 RD |
222 | if (event->counter) { |
223 | ++(*event->counter); | |
224 | list_del(&event->obj_list); | |
225 | } | |
226 | } | |
bc38a6ab RD |
227 | |
228 | spin_unlock_irq(&file->lock); | |
229 | ||
230 | if (event) { | |
231 | if (copy_to_user(buf, event, eventsz)) | |
232 | ret = -EFAULT; | |
233 | else | |
234 | ret = eventsz; | |
235 | } | |
236 | ||
237 | kfree(event); | |
238 | ||
239 | return ret; | |
240 | } | |
241 | ||
242 | static unsigned int ib_uverbs_event_poll(struct file *filp, | |
243 | struct poll_table_struct *wait) | |
244 | { | |
245 | unsigned int pollflags = 0; | |
246 | struct ib_uverbs_event_file *file = filp->private_data; | |
247 | ||
248 | poll_wait(filp, &file->poll_wait, wait); | |
249 | ||
250 | spin_lock_irq(&file->lock); | |
251 | if (file->fd < 0) | |
252 | pollflags = POLLERR; | |
253 | else if (!list_empty(&file->event_list)) | |
254 | pollflags = POLLIN | POLLRDNORM; | |
255 | spin_unlock_irq(&file->lock); | |
256 | ||
257 | return pollflags; | |
258 | } | |
259 | ||
260 | static void ib_uverbs_event_release(struct ib_uverbs_event_file *file) | |
261 | { | |
63aaf647 | 262 | struct ib_uverbs_event *entry, *tmp; |
bc38a6ab RD |
263 | |
264 | spin_lock_irq(&file->lock); | |
265 | if (file->fd != -1) { | |
266 | file->fd = -1; | |
63aaf647 RD |
267 | list_for_each_entry_safe(entry, tmp, &file->event_list, list) |
268 | kfree(entry); | |
bc38a6ab RD |
269 | } |
270 | spin_unlock_irq(&file->lock); | |
271 | } | |
272 | ||
abdf119b GN |
273 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
274 | { | |
275 | struct ib_uverbs_event_file *file = filp->private_data; | |
276 | ||
277 | return fasync_helper(fd, filp, on, &file->async_queue); | |
278 | } | |
279 | ||
bc38a6ab RD |
280 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
281 | { | |
282 | struct ib_uverbs_event_file *file = filp->private_data; | |
283 | ||
284 | ib_uverbs_event_release(file); | |
abdf119b | 285 | ib_uverbs_event_fasync(-1, filp, 0); |
bc38a6ab RD |
286 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static struct file_operations uverbs_event_fops = { | |
292 | /* | |
293 | * No .owner field since we artificially create event files, | |
294 | * so there is no increment to the module reference count in | |
295 | * the open path. All event files come from a uverbs command | |
296 | * file, which already takes a module reference, so this is OK. | |
297 | */ | |
298 | .read = ib_uverbs_event_read, | |
299 | .poll = ib_uverbs_event_poll, | |
abdf119b GN |
300 | .release = ib_uverbs_event_close, |
301 | .fasync = ib_uverbs_event_fasync | |
bc38a6ab RD |
302 | }; |
303 | ||
304 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
305 | { | |
63aaf647 RD |
306 | struct ib_uverbs_file *file = cq_context; |
307 | struct ib_ucq_object *uobj; | |
308 | struct ib_uverbs_event *entry; | |
309 | unsigned long flags; | |
bc38a6ab RD |
310 | |
311 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
312 | if (!entry) | |
313 | return; | |
314 | ||
63aaf647 RD |
315 | uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); |
316 | ||
317 | entry->desc.comp.cq_handle = cq->uobject->user_handle; | |
318 | entry->counter = &uobj->comp_events_reported; | |
bc38a6ab RD |
319 | |
320 | spin_lock_irqsave(&file->comp_file[0].lock, flags); | |
321 | list_add_tail(&entry->list, &file->comp_file[0].event_list); | |
63aaf647 | 322 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
bc38a6ab RD |
323 | spin_unlock_irqrestore(&file->comp_file[0].lock, flags); |
324 | ||
325 | wake_up_interruptible(&file->comp_file[0].poll_wait); | |
abdf119b | 326 | kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN); |
bc38a6ab RD |
327 | } |
328 | ||
329 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, | |
63aaf647 RD |
330 | __u64 element, __u64 event, |
331 | struct list_head *obj_list, | |
332 | u32 *counter) | |
bc38a6ab | 333 | { |
63aaf647 | 334 | struct ib_uverbs_event *entry; |
bc38a6ab RD |
335 | unsigned long flags; |
336 | ||
337 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
338 | if (!entry) | |
339 | return; | |
340 | ||
63aaf647 RD |
341 | entry->desc.async.element = element; |
342 | entry->desc.async.event_type = event; | |
343 | entry->counter = counter; | |
bc38a6ab RD |
344 | |
345 | spin_lock_irqsave(&file->async_file.lock, flags); | |
346 | list_add_tail(&entry->list, &file->async_file.event_list); | |
63aaf647 RD |
347 | if (obj_list) |
348 | list_add_tail(&entry->obj_list, obj_list); | |
bc38a6ab RD |
349 | spin_unlock_irqrestore(&file->async_file.lock, flags); |
350 | ||
351 | wake_up_interruptible(&file->async_file.poll_wait); | |
abdf119b | 352 | kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN); |
bc38a6ab RD |
353 | } |
354 | ||
355 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) | |
356 | { | |
63aaf647 RD |
357 | struct ib_ucq_object *uobj; |
358 | ||
359 | uobj = container_of(event->element.cq->uobject, | |
360 | struct ib_ucq_object, uobject); | |
361 | ||
362 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
363 | event->event, &uobj->async_list, | |
364 | &uobj->async_events_reported); | |
365 | ||
bc38a6ab RD |
366 | } |
367 | ||
368 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
369 | { | |
63aaf647 RD |
370 | struct ib_uevent_object *uobj; |
371 | ||
372 | uobj = container_of(event->element.qp->uobject, | |
373 | struct ib_uevent_object, uobject); | |
374 | ||
375 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
376 | event->event, &uobj->event_list, | |
377 | &uobj->events_reported); | |
bc38a6ab RD |
378 | } |
379 | ||
f520ba5a RD |
380 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
381 | { | |
63aaf647 RD |
382 | struct ib_uevent_object *uobj; |
383 | ||
384 | uobj = container_of(event->element.srq->uobject, | |
385 | struct ib_uevent_object, uobject); | |
386 | ||
387 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
388 | event->event, &uobj->event_list, | |
389 | &uobj->events_reported); | |
f520ba5a RD |
390 | } |
391 | ||
bc38a6ab RD |
392 | static void ib_uverbs_event_handler(struct ib_event_handler *handler, |
393 | struct ib_event *event) | |
394 | { | |
395 | struct ib_uverbs_file *file = | |
396 | container_of(handler, struct ib_uverbs_file, event_handler); | |
397 | ||
63aaf647 RD |
398 | ib_uverbs_async_handler(file, event->element.port_num, event->event, |
399 | NULL, NULL); | |
bc38a6ab RD |
400 | } |
401 | ||
402 | static int ib_uverbs_event_init(struct ib_uverbs_event_file *file, | |
403 | struct ib_uverbs_file *uverbs_file) | |
404 | { | |
405 | struct file *filp; | |
406 | ||
407 | spin_lock_init(&file->lock); | |
408 | INIT_LIST_HEAD(&file->event_list); | |
409 | init_waitqueue_head(&file->poll_wait); | |
410 | file->uverbs_file = uverbs_file; | |
abdf119b | 411 | file->async_queue = NULL; |
bc38a6ab RD |
412 | |
413 | file->fd = get_unused_fd(); | |
414 | if (file->fd < 0) | |
415 | return file->fd; | |
416 | ||
417 | filp = get_empty_filp(); | |
418 | if (!filp) { | |
419 | put_unused_fd(file->fd); | |
420 | return -ENFILE; | |
421 | } | |
422 | ||
423 | filp->f_op = &uverbs_event_fops; | |
424 | filp->f_vfsmnt = mntget(uverbs_event_mnt); | |
425 | filp->f_dentry = dget(uverbs_event_mnt->mnt_root); | |
426 | filp->f_mapping = filp->f_dentry->d_inode->i_mapping; | |
427 | filp->f_flags = O_RDONLY; | |
428 | filp->f_mode = FMODE_READ; | |
429 | filp->private_data = file; | |
430 | ||
431 | fd_install(file->fd, filp); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, | |
437 | size_t count, loff_t *pos) | |
438 | { | |
439 | struct ib_uverbs_file *file = filp->private_data; | |
440 | struct ib_uverbs_cmd_hdr hdr; | |
441 | ||
442 | if (count < sizeof hdr) | |
443 | return -EINVAL; | |
444 | ||
445 | if (copy_from_user(&hdr, buf, sizeof hdr)) | |
446 | return -EFAULT; | |
447 | ||
448 | if (hdr.in_words * 4 != count) | |
449 | return -EINVAL; | |
450 | ||
63c47c28 RD |
451 | if (hdr.command < 0 || |
452 | hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || | |
453 | !uverbs_cmd_table[hdr.command]) | |
bc38a6ab RD |
454 | return -EINVAL; |
455 | ||
456 | if (!file->ucontext && | |
457 | hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS && | |
458 | hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) | |
459 | return -EINVAL; | |
460 | ||
461 | return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, | |
462 | hdr.in_words * 4, hdr.out_words * 4); | |
463 | } | |
464 | ||
465 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) | |
466 | { | |
467 | struct ib_uverbs_file *file = filp->private_data; | |
468 | ||
469 | if (!file->ucontext) | |
470 | return -ENODEV; | |
471 | else | |
472 | return file->device->ib_dev->mmap(file->ucontext, vma); | |
473 | } | |
474 | ||
475 | static int ib_uverbs_open(struct inode *inode, struct file *filp) | |
476 | { | |
477 | struct ib_uverbs_device *dev = | |
478 | container_of(inode->i_cdev, struct ib_uverbs_device, dev); | |
479 | struct ib_uverbs_file *file; | |
480 | int i = 0; | |
481 | int ret; | |
482 | ||
483 | if (!try_module_get(dev->ib_dev->owner)) | |
484 | return -ENODEV; | |
485 | ||
486 | file = kmalloc(sizeof *file + | |
487 | (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file), | |
488 | GFP_KERNEL); | |
63c47c28 RD |
489 | if (!file) { |
490 | ret = -ENOMEM; | |
491 | goto err; | |
492 | } | |
bc38a6ab RD |
493 | |
494 | file->device = dev; | |
495 | kref_init(&file->ref); | |
63c47c28 | 496 | init_MUTEX(&file->mutex); |
bc38a6ab RD |
497 | |
498 | file->ucontext = NULL; | |
499 | ||
63c47c28 | 500 | kref_get(&file->ref); |
bc38a6ab RD |
501 | ret = ib_uverbs_event_init(&file->async_file, file); |
502 | if (ret) | |
63c47c28 | 503 | goto err_kref; |
bc38a6ab RD |
504 | |
505 | file->async_file.is_async = 1; | |
506 | ||
bc38a6ab | 507 | for (i = 0; i < dev->num_comp; ++i) { |
63c47c28 | 508 | kref_get(&file->ref); |
bc38a6ab RD |
509 | ret = ib_uverbs_event_init(&file->comp_file[i], file); |
510 | if (ret) | |
511 | goto err_async; | |
bc38a6ab RD |
512 | file->comp_file[i].is_async = 0; |
513 | } | |
514 | ||
515 | ||
516 | filp->private_data = file; | |
517 | ||
518 | INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev, | |
519 | ib_uverbs_event_handler); | |
520 | if (ib_register_event_handler(&file->event_handler)) | |
521 | goto err_async; | |
522 | ||
523 | return 0; | |
524 | ||
525 | err_async: | |
526 | while (i--) | |
527 | ib_uverbs_event_release(&file->comp_file[i]); | |
528 | ||
529 | ib_uverbs_event_release(&file->async_file); | |
530 | ||
63c47c28 RD |
531 | err_kref: |
532 | /* | |
533 | * One extra kref_put() because we took a reference before the | |
534 | * event file creation that failed and got us here. | |
535 | */ | |
536 | kref_put(&file->ref, ib_uverbs_release_file); | |
bc38a6ab RD |
537 | kref_put(&file->ref, ib_uverbs_release_file); |
538 | ||
63c47c28 RD |
539 | err: |
540 | module_put(dev->ib_dev->owner); | |
bc38a6ab RD |
541 | return ret; |
542 | } | |
543 | ||
544 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
545 | { | |
546 | struct ib_uverbs_file *file = filp->private_data; | |
547 | int i; | |
548 | ||
549 | ib_unregister_event_handler(&file->event_handler); | |
550 | ib_uverbs_event_release(&file->async_file); | |
551 | ib_dealloc_ucontext(file->ucontext); | |
552 | ||
553 | for (i = 0; i < file->device->num_comp; ++i) | |
554 | ib_uverbs_event_release(&file->comp_file[i]); | |
555 | ||
556 | kref_put(&file->ref, ib_uverbs_release_file); | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | static struct file_operations uverbs_fops = { | |
562 | .owner = THIS_MODULE, | |
563 | .write = ib_uverbs_write, | |
564 | .open = ib_uverbs_open, | |
565 | .release = ib_uverbs_close | |
566 | }; | |
567 | ||
568 | static struct file_operations uverbs_mmap_fops = { | |
569 | .owner = THIS_MODULE, | |
570 | .write = ib_uverbs_write, | |
571 | .mmap = ib_uverbs_mmap, | |
572 | .open = ib_uverbs_open, | |
573 | .release = ib_uverbs_close | |
574 | }; | |
575 | ||
576 | static struct ib_client uverbs_client = { | |
577 | .name = "uverbs", | |
578 | .add = ib_uverbs_add_one, | |
579 | .remove = ib_uverbs_remove_one | |
580 | }; | |
581 | ||
582 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
583 | { | |
584 | struct ib_uverbs_device *dev = | |
585 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
586 | ||
587 | return sprintf(buf, "%s\n", dev->ib_dev->name); | |
588 | } | |
589 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
590 | ||
591 | static void ib_uverbs_release_class_dev(struct class_device *class_dev) | |
592 | { | |
593 | struct ib_uverbs_device *dev = | |
594 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
595 | ||
596 | cdev_del(&dev->dev); | |
597 | clear_bit(dev->devnum, dev_map); | |
598 | kfree(dev); | |
599 | } | |
600 | ||
601 | static struct class uverbs_class = { | |
602 | .name = "infiniband_verbs", | |
603 | .release = ib_uverbs_release_class_dev | |
604 | }; | |
605 | ||
606 | static ssize_t show_abi_version(struct class *class, char *buf) | |
607 | { | |
608 | return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); | |
609 | } | |
610 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
611 | ||
612 | static void ib_uverbs_add_one(struct ib_device *device) | |
613 | { | |
614 | struct ib_uverbs_device *uverbs_dev; | |
615 | ||
616 | if (!device->alloc_ucontext) | |
617 | return; | |
618 | ||
619 | uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL); | |
620 | if (!uverbs_dev) | |
621 | return; | |
622 | ||
623 | memset(uverbs_dev, 0, sizeof *uverbs_dev); | |
624 | ||
625 | spin_lock(&map_lock); | |
626 | uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); | |
627 | if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { | |
628 | spin_unlock(&map_lock); | |
629 | goto err; | |
630 | } | |
631 | set_bit(uverbs_dev->devnum, dev_map); | |
632 | spin_unlock(&map_lock); | |
633 | ||
634 | uverbs_dev->ib_dev = device; | |
635 | uverbs_dev->num_comp = 1; | |
636 | ||
637 | if (device->mmap) | |
638 | cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops); | |
639 | else | |
640 | cdev_init(&uverbs_dev->dev, &uverbs_fops); | |
641 | uverbs_dev->dev.owner = THIS_MODULE; | |
642 | kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum); | |
643 | if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) | |
644 | goto err; | |
645 | ||
646 | uverbs_dev->class_dev.class = &uverbs_class; | |
647 | uverbs_dev->class_dev.dev = device->dma_device; | |
648 | uverbs_dev->class_dev.devt = uverbs_dev->dev.dev; | |
649 | snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum); | |
650 | if (class_device_register(&uverbs_dev->class_dev)) | |
651 | goto err_cdev; | |
652 | ||
653 | if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev)) | |
654 | goto err_class; | |
655 | ||
656 | ib_set_client_data(device, &uverbs_client, uverbs_dev); | |
657 | ||
658 | return; | |
659 | ||
660 | err_class: | |
661 | class_device_unregister(&uverbs_dev->class_dev); | |
662 | ||
663 | err_cdev: | |
664 | cdev_del(&uverbs_dev->dev); | |
665 | clear_bit(uverbs_dev->devnum, dev_map); | |
666 | ||
667 | err: | |
668 | kfree(uverbs_dev); | |
669 | return; | |
670 | } | |
671 | ||
672 | static void ib_uverbs_remove_one(struct ib_device *device) | |
673 | { | |
674 | struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); | |
675 | ||
676 | if (!uverbs_dev) | |
677 | return; | |
678 | ||
679 | class_device_unregister(&uverbs_dev->class_dev); | |
680 | } | |
681 | ||
682 | static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, | |
683 | const char *dev_name, void *data) | |
684 | { | |
685 | return get_sb_pseudo(fs_type, "infinibandevent:", NULL, | |
686 | INFINIBANDEVENTFS_MAGIC); | |
687 | } | |
688 | ||
689 | static struct file_system_type uverbs_event_fs = { | |
690 | /* No owner field so module can be unloaded */ | |
691 | .name = "infinibandeventfs", | |
692 | .get_sb = uverbs_event_get_sb, | |
693 | .kill_sb = kill_litter_super | |
694 | }; | |
695 | ||
696 | static int __init ib_uverbs_init(void) | |
697 | { | |
698 | int ret; | |
699 | ||
700 | spin_lock_init(&map_lock); | |
701 | ||
702 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, | |
703 | "infiniband_verbs"); | |
704 | if (ret) { | |
705 | printk(KERN_ERR "user_verbs: couldn't register device number\n"); | |
706 | goto out; | |
707 | } | |
708 | ||
709 | ret = class_register(&uverbs_class); | |
710 | if (ret) { | |
711 | printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); | |
712 | goto out_chrdev; | |
713 | } | |
714 | ||
715 | ret = class_create_file(&uverbs_class, &class_attr_abi_version); | |
716 | if (ret) { | |
717 | printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); | |
718 | goto out_class; | |
719 | } | |
720 | ||
721 | ret = register_filesystem(&uverbs_event_fs); | |
722 | if (ret) { | |
723 | printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); | |
724 | goto out_class; | |
725 | } | |
726 | ||
727 | uverbs_event_mnt = kern_mount(&uverbs_event_fs); | |
728 | if (IS_ERR(uverbs_event_mnt)) { | |
729 | ret = PTR_ERR(uverbs_event_mnt); | |
730 | printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); | |
731 | goto out_fs; | |
732 | } | |
733 | ||
734 | ret = ib_register_client(&uverbs_client); | |
735 | if (ret) { | |
736 | printk(KERN_ERR "user_verbs: couldn't register client\n"); | |
737 | goto out_mnt; | |
738 | } | |
739 | ||
740 | return 0; | |
741 | ||
742 | out_mnt: | |
743 | mntput(uverbs_event_mnt); | |
744 | ||
745 | out_fs: | |
746 | unregister_filesystem(&uverbs_event_fs); | |
747 | ||
748 | out_class: | |
749 | class_unregister(&uverbs_class); | |
750 | ||
751 | out_chrdev: | |
752 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
753 | ||
754 | out: | |
755 | return ret; | |
756 | } | |
757 | ||
758 | static void __exit ib_uverbs_cleanup(void) | |
759 | { | |
760 | ib_unregister_client(&uverbs_client); | |
761 | mntput(uverbs_event_mnt); | |
762 | unregister_filesystem(&uverbs_event_fs); | |
763 | class_unregister(&uverbs_class); | |
764 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
765 | } | |
766 | ||
767 | module_init(ib_uverbs_init); | |
768 | module_exit(ib_uverbs_cleanup); |