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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) = { | |
6b73597e RD |
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_ALLOC_PD] = ib_uverbs_alloc_pd, | |
84 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, | |
85 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, | |
86 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, | |
87 | [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, | |
88 | [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, | |
89 | [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, | |
90 | [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, | |
91 | [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, | |
92 | [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, | |
93 | [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, | |
94 | [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, | |
95 | [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, | |
96 | [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, | |
97 | [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, | |
bc38a6ab RD |
98 | }; |
99 | ||
100 | static struct vfsmount *uverbs_event_mnt; | |
101 | ||
102 | static void ib_uverbs_add_one(struct ib_device *device); | |
103 | static void ib_uverbs_remove_one(struct ib_device *device); | |
104 | ||
105 | static int ib_dealloc_ucontext(struct ib_ucontext *context) | |
106 | { | |
107 | struct ib_uobject *uobj, *tmp; | |
108 | ||
109 | if (!context) | |
110 | return 0; | |
111 | ||
112 | down(&ib_uverbs_idr_mutex); | |
113 | ||
114 | /* XXX Free AHs */ | |
115 | ||
116 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { | |
117 | struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); | |
118 | idr_remove(&ib_uverbs_qp_idr, uobj->id); | |
119 | ib_destroy_qp(qp); | |
120 | list_del(&uobj->list); | |
63aaf647 | 121 | kfree(container_of(uobj, struct ib_uevent_object, uobject)); |
bc38a6ab RD |
122 | } |
123 | ||
124 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { | |
125 | struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); | |
126 | idr_remove(&ib_uverbs_cq_idr, uobj->id); | |
127 | ib_destroy_cq(cq); | |
128 | list_del(&uobj->list); | |
63aaf647 | 129 | kfree(container_of(uobj, struct ib_ucq_object, uobject)); |
bc38a6ab RD |
130 | } |
131 | ||
f520ba5a RD |
132 | list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { |
133 | struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id); | |
134 | idr_remove(&ib_uverbs_srq_idr, uobj->id); | |
135 | ib_destroy_srq(srq); | |
136 | list_del(&uobj->list); | |
63aaf647 | 137 | kfree(container_of(uobj, struct ib_uevent_object, uobject)); |
f520ba5a RD |
138 | } |
139 | ||
bc38a6ab RD |
140 | /* XXX Free MWs */ |
141 | ||
142 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { | |
143 | struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); | |
e1bcfcaa | 144 | struct ib_device *mrdev = mr->device; |
bc38a6ab RD |
145 | struct ib_umem_object *memobj; |
146 | ||
147 | idr_remove(&ib_uverbs_mr_idr, uobj->id); | |
148 | ib_dereg_mr(mr); | |
149 | ||
150 | memobj = container_of(uobj, struct ib_umem_object, uobject); | |
e1bcfcaa | 151 | ib_umem_release_on_close(mrdev, &memobj->umem); |
bc38a6ab RD |
152 | |
153 | list_del(&uobj->list); | |
154 | kfree(memobj); | |
155 | } | |
156 | ||
157 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { | |
158 | struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); | |
159 | idr_remove(&ib_uverbs_pd_idr, uobj->id); | |
160 | ib_dealloc_pd(pd); | |
161 | list_del(&uobj->list); | |
162 | kfree(uobj); | |
163 | } | |
164 | ||
165 | up(&ib_uverbs_idr_mutex); | |
166 | ||
167 | return context->device->dealloc_ucontext(context); | |
168 | } | |
169 | ||
170 | static void ib_uverbs_release_file(struct kref *ref) | |
171 | { | |
172 | struct ib_uverbs_file *file = | |
173 | container_of(ref, struct ib_uverbs_file, ref); | |
174 | ||
175 | module_put(file->device->ib_dev->owner); | |
176 | kfree(file); | |
177 | } | |
178 | ||
179 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, | |
180 | size_t count, loff_t *pos) | |
181 | { | |
182 | struct ib_uverbs_event_file *file = filp->private_data; | |
63aaf647 | 183 | struct ib_uverbs_event *event; |
bc38a6ab RD |
184 | int eventsz; |
185 | int ret = 0; | |
186 | ||
187 | spin_lock_irq(&file->lock); | |
188 | ||
6b73597e | 189 | while (list_empty(&file->event_list)) { |
bc38a6ab RD |
190 | spin_unlock_irq(&file->lock); |
191 | ||
192 | if (filp->f_flags & O_NONBLOCK) | |
193 | return -EAGAIN; | |
194 | ||
195 | if (wait_event_interruptible(file->poll_wait, | |
6b73597e | 196 | !list_empty(&file->event_list))) |
bc38a6ab RD |
197 | return -ERESTARTSYS; |
198 | ||
199 | spin_lock_irq(&file->lock); | |
200 | } | |
201 | ||
63aaf647 RD |
202 | event = list_entry(file->event_list.next, struct ib_uverbs_event, list); |
203 | ||
204 | if (file->is_async) | |
bc38a6ab | 205 | eventsz = sizeof (struct ib_uverbs_async_event_desc); |
63aaf647 | 206 | else |
bc38a6ab | 207 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); |
bc38a6ab RD |
208 | |
209 | if (eventsz > count) { | |
210 | ret = -EINVAL; | |
211 | event = NULL; | |
63aaf647 | 212 | } else { |
bc38a6ab | 213 | list_del(file->event_list.next); |
63aaf647 RD |
214 | if (event->counter) { |
215 | ++(*event->counter); | |
216 | list_del(&event->obj_list); | |
217 | } | |
218 | } | |
bc38a6ab RD |
219 | |
220 | spin_unlock_irq(&file->lock); | |
221 | ||
222 | if (event) { | |
223 | if (copy_to_user(buf, event, eventsz)) | |
224 | ret = -EFAULT; | |
225 | else | |
226 | ret = eventsz; | |
227 | } | |
228 | ||
229 | kfree(event); | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
234 | static unsigned int ib_uverbs_event_poll(struct file *filp, | |
235 | struct poll_table_struct *wait) | |
236 | { | |
237 | unsigned int pollflags = 0; | |
238 | struct ib_uverbs_event_file *file = filp->private_data; | |
239 | ||
240 | poll_wait(filp, &file->poll_wait, wait); | |
241 | ||
242 | spin_lock_irq(&file->lock); | |
6b73597e | 243 | if (!list_empty(&file->event_list)) |
bc38a6ab RD |
244 | pollflags = POLLIN | POLLRDNORM; |
245 | spin_unlock_irq(&file->lock); | |
246 | ||
247 | return pollflags; | |
248 | } | |
249 | ||
6b73597e | 250 | void ib_uverbs_release_event_file(struct kref *ref) |
bc38a6ab | 251 | { |
6b73597e RD |
252 | struct ib_uverbs_event_file *file = |
253 | container_of(ref, struct ib_uverbs_event_file, ref); | |
bc38a6ab | 254 | |
6b73597e | 255 | kfree(file); |
bc38a6ab RD |
256 | } |
257 | ||
abdf119b GN |
258 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
259 | { | |
260 | struct ib_uverbs_event_file *file = filp->private_data; | |
261 | ||
262 | return fasync_helper(fd, filp, on, &file->async_queue); | |
263 | } | |
264 | ||
bc38a6ab RD |
265 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
266 | { | |
267 | struct ib_uverbs_event_file *file = filp->private_data; | |
6b73597e RD |
268 | struct ib_uverbs_event *entry, *tmp; |
269 | ||
270 | spin_lock_irq(&file->lock); | |
271 | file->file = NULL; | |
272 | list_for_each_entry_safe(entry, tmp, &file->event_list, list) { | |
273 | if (entry->counter) | |
274 | list_del(&entry->obj_list); | |
275 | kfree(entry); | |
276 | } | |
277 | spin_unlock_irq(&file->lock); | |
bc38a6ab | 278 | |
abdf119b | 279 | ib_uverbs_event_fasync(-1, filp, 0); |
6b73597e RD |
280 | |
281 | if (file->is_async) { | |
282 | ib_unregister_event_handler(&file->uverbs_file->event_handler); | |
283 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); | |
284 | } | |
285 | kref_put(&file->ref, ib_uverbs_release_event_file); | |
bc38a6ab RD |
286 | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static struct file_operations uverbs_event_fops = { | |
6b73597e | 291 | .owner = THIS_MODULE, |
bc38a6ab RD |
292 | .read = ib_uverbs_event_read, |
293 | .poll = ib_uverbs_event_poll, | |
abdf119b GN |
294 | .release = ib_uverbs_event_close, |
295 | .fasync = ib_uverbs_event_fasync | |
bc38a6ab RD |
296 | }; |
297 | ||
298 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
299 | { | |
6b73597e RD |
300 | struct ib_uverbs_event_file *file = cq_context; |
301 | struct ib_ucq_object *uobj; | |
302 | struct ib_uverbs_event *entry; | |
303 | unsigned long flags; | |
304 | ||
305 | if (!file) | |
306 | return; | |
307 | ||
308 | spin_lock_irqsave(&file->lock, flags); | |
309 | if (!file->file) { | |
310 | spin_unlock_irqrestore(&file->lock, flags); | |
311 | return; | |
312 | } | |
bc38a6ab RD |
313 | |
314 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); | |
315 | if (!entry) | |
316 | return; | |
317 | ||
63aaf647 RD |
318 | uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); |
319 | ||
320 | entry->desc.comp.cq_handle = cq->uobject->user_handle; | |
321 | entry->counter = &uobj->comp_events_reported; | |
bc38a6ab | 322 | |
6b73597e | 323 | list_add_tail(&entry->list, &file->event_list); |
63aaf647 | 324 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
6b73597e | 325 | spin_unlock_irqrestore(&file->lock, flags); |
bc38a6ab | 326 | |
6b73597e RD |
327 | wake_up_interruptible(&file->poll_wait); |
328 | kill_fasync(&file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
329 | } |
330 | ||
331 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, | |
63aaf647 RD |
332 | __u64 element, __u64 event, |
333 | struct list_head *obj_list, | |
334 | u32 *counter) | |
bc38a6ab | 335 | { |
63aaf647 | 336 | struct ib_uverbs_event *entry; |
bc38a6ab RD |
337 | unsigned long flags; |
338 | ||
6b73597e RD |
339 | spin_lock_irqsave(&file->async_file->lock, flags); |
340 | if (!file->async_file->file) { | |
341 | spin_unlock_irqrestore(&file->async_file->lock, flags); | |
342 | return; | |
343 | } | |
344 | ||
bc38a6ab RD |
345 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
346 | if (!entry) | |
347 | return; | |
348 | ||
63aaf647 RD |
349 | entry->desc.async.element = element; |
350 | entry->desc.async.event_type = event; | |
351 | entry->counter = counter; | |
bc38a6ab | 352 | |
6b73597e | 353 | list_add_tail(&entry->list, &file->async_file->event_list); |
63aaf647 RD |
354 | if (obj_list) |
355 | list_add_tail(&entry->obj_list, obj_list); | |
6b73597e | 356 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
bc38a6ab | 357 | |
6b73597e RD |
358 | wake_up_interruptible(&file->async_file->poll_wait); |
359 | kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
360 | } |
361 | ||
362 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) | |
363 | { | |
6b73597e | 364 | struct ib_uverbs_event_file *ev_file = context_ptr; |
63aaf647 RD |
365 | struct ib_ucq_object *uobj; |
366 | ||
367 | uobj = container_of(event->element.cq->uobject, | |
368 | struct ib_ucq_object, uobject); | |
369 | ||
6b73597e | 370 | ib_uverbs_async_handler(ev_file->uverbs_file, uobj->uobject.user_handle, |
63aaf647 RD |
371 | event->event, &uobj->async_list, |
372 | &uobj->async_events_reported); | |
373 | ||
bc38a6ab RD |
374 | } |
375 | ||
376 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
377 | { | |
63aaf647 RD |
378 | struct ib_uevent_object *uobj; |
379 | ||
380 | uobj = container_of(event->element.qp->uobject, | |
381 | struct ib_uevent_object, uobject); | |
382 | ||
383 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
384 | event->event, &uobj->event_list, | |
385 | &uobj->events_reported); | |
bc38a6ab RD |
386 | } |
387 | ||
f520ba5a RD |
388 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
389 | { | |
63aaf647 RD |
390 | struct ib_uevent_object *uobj; |
391 | ||
392 | uobj = container_of(event->element.srq->uobject, | |
393 | struct ib_uevent_object, uobject); | |
394 | ||
395 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, | |
396 | event->event, &uobj->event_list, | |
397 | &uobj->events_reported); | |
f520ba5a RD |
398 | } |
399 | ||
6b73597e RD |
400 | void ib_uverbs_event_handler(struct ib_event_handler *handler, |
401 | struct ib_event *event) | |
bc38a6ab RD |
402 | { |
403 | struct ib_uverbs_file *file = | |
404 | container_of(handler, struct ib_uverbs_file, event_handler); | |
405 | ||
63aaf647 RD |
406 | ib_uverbs_async_handler(file, event->element.port_num, event->event, |
407 | NULL, NULL); | |
bc38a6ab RD |
408 | } |
409 | ||
6b73597e RD |
410 | struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, |
411 | int is_async, int *fd) | |
bc38a6ab | 412 | { |
6b73597e | 413 | struct ib_uverbs_event_file *ev_file; |
bc38a6ab | 414 | struct file *filp; |
6b73597e | 415 | int ret; |
bc38a6ab | 416 | |
6b73597e RD |
417 | ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); |
418 | if (!ev_file) | |
419 | return ERR_PTR(-ENOMEM); | |
420 | ||
421 | kref_init(&ev_file->ref); | |
422 | spin_lock_init(&ev_file->lock); | |
423 | INIT_LIST_HEAD(&ev_file->event_list); | |
424 | init_waitqueue_head(&ev_file->poll_wait); | |
425 | ev_file->uverbs_file = uverbs_file; | |
426 | ev_file->async_queue = NULL; | |
427 | ev_file->is_async = is_async; | |
428 | ||
429 | *fd = get_unused_fd(); | |
430 | if (*fd < 0) { | |
431 | ret = *fd; | |
432 | goto err; | |
433 | } | |
bc38a6ab RD |
434 | |
435 | filp = get_empty_filp(); | |
436 | if (!filp) { | |
6b73597e RD |
437 | ret = -ENFILE; |
438 | goto err_fd; | |
bc38a6ab RD |
439 | } |
440 | ||
6b73597e RD |
441 | ev_file->file = filp; |
442 | ||
443 | /* | |
444 | * fops_get() can't fail here, because we're coming from a | |
445 | * system call on a uverbs file, which will already have a | |
446 | * module reference. | |
447 | */ | |
448 | filp->f_op = fops_get(&uverbs_event_fops); | |
bc38a6ab RD |
449 | filp->f_vfsmnt = mntget(uverbs_event_mnt); |
450 | filp->f_dentry = dget(uverbs_event_mnt->mnt_root); | |
451 | filp->f_mapping = filp->f_dentry->d_inode->i_mapping; | |
452 | filp->f_flags = O_RDONLY; | |
453 | filp->f_mode = FMODE_READ; | |
6b73597e | 454 | filp->private_data = ev_file; |
bc38a6ab | 455 | |
6b73597e | 456 | return filp; |
bc38a6ab | 457 | |
6b73597e RD |
458 | err_fd: |
459 | put_unused_fd(*fd); | |
460 | ||
461 | err: | |
462 | kfree(ev_file); | |
463 | return ERR_PTR(ret); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Look up a completion event file by FD. If lookup is successful, | |
468 | * takes a ref to the event file struct that it returns; if | |
469 | * unsuccessful, returns NULL. | |
470 | */ | |
471 | struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) | |
472 | { | |
473 | struct ib_uverbs_event_file *ev_file = NULL; | |
474 | struct file *filp; | |
475 | ||
476 | filp = fget(fd); | |
477 | if (!filp) | |
478 | return NULL; | |
479 | ||
480 | if (filp->f_op != &uverbs_event_fops) | |
481 | goto out; | |
482 | ||
483 | ev_file = filp->private_data; | |
484 | if (ev_file->is_async) { | |
485 | ev_file = NULL; | |
486 | goto out; | |
487 | } | |
488 | ||
489 | kref_get(&ev_file->ref); | |
490 | ||
491 | out: | |
492 | fput(filp); | |
493 | return ev_file; | |
bc38a6ab RD |
494 | } |
495 | ||
496 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, | |
497 | size_t count, loff_t *pos) | |
498 | { | |
499 | struct ib_uverbs_file *file = filp->private_data; | |
500 | struct ib_uverbs_cmd_hdr hdr; | |
501 | ||
502 | if (count < sizeof hdr) | |
503 | return -EINVAL; | |
504 | ||
505 | if (copy_from_user(&hdr, buf, sizeof hdr)) | |
506 | return -EFAULT; | |
507 | ||
508 | if (hdr.in_words * 4 != count) | |
509 | return -EINVAL; | |
510 | ||
63c47c28 RD |
511 | if (hdr.command < 0 || |
512 | hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || | |
513 | !uverbs_cmd_table[hdr.command]) | |
bc38a6ab RD |
514 | return -EINVAL; |
515 | ||
6b73597e | 516 | if (!file->ucontext && |
bc38a6ab RD |
517 | hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) |
518 | return -EINVAL; | |
519 | ||
520 | return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, | |
521 | hdr.in_words * 4, hdr.out_words * 4); | |
522 | } | |
523 | ||
524 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) | |
525 | { | |
526 | struct ib_uverbs_file *file = filp->private_data; | |
527 | ||
528 | if (!file->ucontext) | |
529 | return -ENODEV; | |
530 | else | |
531 | return file->device->ib_dev->mmap(file->ucontext, vma); | |
532 | } | |
533 | ||
534 | static int ib_uverbs_open(struct inode *inode, struct file *filp) | |
535 | { | |
536 | struct ib_uverbs_device *dev = | |
537 | container_of(inode->i_cdev, struct ib_uverbs_device, dev); | |
538 | struct ib_uverbs_file *file; | |
bc38a6ab RD |
539 | |
540 | if (!try_module_get(dev->ib_dev->owner)) | |
541 | return -ENODEV; | |
542 | ||
6b73597e | 543 | file = kmalloc(sizeof *file, GFP_KERNEL); |
63c47c28 | 544 | if (!file) { |
6b73597e RD |
545 | module_put(dev->ib_dev->owner); |
546 | return -ENOMEM; | |
63c47c28 | 547 | } |
bc38a6ab | 548 | |
6b73597e RD |
549 | file->device = dev; |
550 | file->ucontext = NULL; | |
bc38a6ab | 551 | kref_init(&file->ref); |
63c47c28 | 552 | init_MUTEX(&file->mutex); |
bc38a6ab | 553 | |
bc38a6ab RD |
554 | filp->private_data = file; |
555 | ||
bc38a6ab | 556 | return 0; |
bc38a6ab RD |
557 | } |
558 | ||
559 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
560 | { | |
561 | struct ib_uverbs_file *file = filp->private_data; | |
bc38a6ab | 562 | |
bc38a6ab RD |
563 | ib_dealloc_ucontext(file->ucontext); |
564 | ||
6b73597e | 565 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); |
bc38a6ab RD |
566 | kref_put(&file->ref, ib_uverbs_release_file); |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | static struct file_operations uverbs_fops = { | |
572 | .owner = THIS_MODULE, | |
573 | .write = ib_uverbs_write, | |
574 | .open = ib_uverbs_open, | |
575 | .release = ib_uverbs_close | |
576 | }; | |
577 | ||
578 | static struct file_operations uverbs_mmap_fops = { | |
579 | .owner = THIS_MODULE, | |
580 | .write = ib_uverbs_write, | |
581 | .mmap = ib_uverbs_mmap, | |
582 | .open = ib_uverbs_open, | |
583 | .release = ib_uverbs_close | |
584 | }; | |
585 | ||
586 | static struct ib_client uverbs_client = { | |
587 | .name = "uverbs", | |
588 | .add = ib_uverbs_add_one, | |
589 | .remove = ib_uverbs_remove_one | |
590 | }; | |
591 | ||
592 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
593 | { | |
594 | struct ib_uverbs_device *dev = | |
595 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
596 | ||
597 | return sprintf(buf, "%s\n", dev->ib_dev->name); | |
598 | } | |
599 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
600 | ||
601 | static void ib_uverbs_release_class_dev(struct class_device *class_dev) | |
602 | { | |
603 | struct ib_uverbs_device *dev = | |
604 | container_of(class_dev, struct ib_uverbs_device, class_dev); | |
605 | ||
606 | cdev_del(&dev->dev); | |
607 | clear_bit(dev->devnum, dev_map); | |
608 | kfree(dev); | |
609 | } | |
610 | ||
611 | static struct class uverbs_class = { | |
612 | .name = "infiniband_verbs", | |
613 | .release = ib_uverbs_release_class_dev | |
614 | }; | |
615 | ||
616 | static ssize_t show_abi_version(struct class *class, char *buf) | |
617 | { | |
618 | return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); | |
619 | } | |
620 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
621 | ||
622 | static void ib_uverbs_add_one(struct ib_device *device) | |
623 | { | |
624 | struct ib_uverbs_device *uverbs_dev; | |
625 | ||
626 | if (!device->alloc_ucontext) | |
627 | return; | |
628 | ||
629 | uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL); | |
630 | if (!uverbs_dev) | |
631 | return; | |
632 | ||
633 | memset(uverbs_dev, 0, sizeof *uverbs_dev); | |
634 | ||
635 | spin_lock(&map_lock); | |
636 | uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); | |
637 | if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { | |
638 | spin_unlock(&map_lock); | |
639 | goto err; | |
640 | } | |
641 | set_bit(uverbs_dev->devnum, dev_map); | |
642 | spin_unlock(&map_lock); | |
643 | ||
6b73597e RD |
644 | uverbs_dev->ib_dev = device; |
645 | uverbs_dev->num_comp_vectors = 1; | |
bc38a6ab RD |
646 | |
647 | if (device->mmap) | |
648 | cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops); | |
649 | else | |
650 | cdev_init(&uverbs_dev->dev, &uverbs_fops); | |
651 | uverbs_dev->dev.owner = THIS_MODULE; | |
652 | kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum); | |
653 | if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) | |
654 | goto err; | |
655 | ||
656 | uverbs_dev->class_dev.class = &uverbs_class; | |
657 | uverbs_dev->class_dev.dev = device->dma_device; | |
658 | uverbs_dev->class_dev.devt = uverbs_dev->dev.dev; | |
659 | snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum); | |
660 | if (class_device_register(&uverbs_dev->class_dev)) | |
661 | goto err_cdev; | |
662 | ||
663 | if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev)) | |
664 | goto err_class; | |
665 | ||
666 | ib_set_client_data(device, &uverbs_client, uverbs_dev); | |
667 | ||
668 | return; | |
669 | ||
670 | err_class: | |
671 | class_device_unregister(&uverbs_dev->class_dev); | |
672 | ||
673 | err_cdev: | |
674 | cdev_del(&uverbs_dev->dev); | |
675 | clear_bit(uverbs_dev->devnum, dev_map); | |
676 | ||
677 | err: | |
678 | kfree(uverbs_dev); | |
679 | return; | |
680 | } | |
681 | ||
682 | static void ib_uverbs_remove_one(struct ib_device *device) | |
683 | { | |
684 | struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); | |
685 | ||
686 | if (!uverbs_dev) | |
687 | return; | |
688 | ||
689 | class_device_unregister(&uverbs_dev->class_dev); | |
690 | } | |
691 | ||
692 | static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, | |
693 | const char *dev_name, void *data) | |
694 | { | |
695 | return get_sb_pseudo(fs_type, "infinibandevent:", NULL, | |
696 | INFINIBANDEVENTFS_MAGIC); | |
697 | } | |
698 | ||
699 | static struct file_system_type uverbs_event_fs = { | |
700 | /* No owner field so module can be unloaded */ | |
701 | .name = "infinibandeventfs", | |
702 | .get_sb = uverbs_event_get_sb, | |
703 | .kill_sb = kill_litter_super | |
704 | }; | |
705 | ||
706 | static int __init ib_uverbs_init(void) | |
707 | { | |
708 | int ret; | |
709 | ||
710 | spin_lock_init(&map_lock); | |
711 | ||
712 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, | |
713 | "infiniband_verbs"); | |
714 | if (ret) { | |
715 | printk(KERN_ERR "user_verbs: couldn't register device number\n"); | |
716 | goto out; | |
717 | } | |
718 | ||
719 | ret = class_register(&uverbs_class); | |
720 | if (ret) { | |
721 | printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); | |
722 | goto out_chrdev; | |
723 | } | |
724 | ||
725 | ret = class_create_file(&uverbs_class, &class_attr_abi_version); | |
726 | if (ret) { | |
727 | printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); | |
728 | goto out_class; | |
729 | } | |
730 | ||
731 | ret = register_filesystem(&uverbs_event_fs); | |
732 | if (ret) { | |
733 | printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); | |
734 | goto out_class; | |
735 | } | |
736 | ||
737 | uverbs_event_mnt = kern_mount(&uverbs_event_fs); | |
738 | if (IS_ERR(uverbs_event_mnt)) { | |
739 | ret = PTR_ERR(uverbs_event_mnt); | |
740 | printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); | |
741 | goto out_fs; | |
742 | } | |
743 | ||
744 | ret = ib_register_client(&uverbs_client); | |
745 | if (ret) { | |
746 | printk(KERN_ERR "user_verbs: couldn't register client\n"); | |
747 | goto out_mnt; | |
748 | } | |
749 | ||
750 | return 0; | |
751 | ||
752 | out_mnt: | |
753 | mntput(uverbs_event_mnt); | |
754 | ||
755 | out_fs: | |
756 | unregister_filesystem(&uverbs_event_fs); | |
757 | ||
758 | out_class: | |
759 | class_unregister(&uverbs_class); | |
760 | ||
761 | out_chrdev: | |
762 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
763 | ||
764 | out: | |
765 | return ret; | |
766 | } | |
767 | ||
768 | static void __exit ib_uverbs_cleanup(void) | |
769 | { | |
770 | ib_unregister_client(&uverbs_client); | |
771 | mntput(uverbs_event_mnt); | |
772 | unregister_filesystem(&uverbs_event_fs); | |
773 | class_unregister(&uverbs_class); | |
774 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); | |
775 | } | |
776 | ||
777 | module_init(ib_uverbs_init); | |
778 | module_exit(ib_uverbs_cleanup); |