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blkcg: fix blkg_alloc() failure path
[linux-2.6.git] / drivers / infiniband / core / user_mad.c
blobf0d588f8859ef5fd2f7679504351003ac77c2589
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * Copyright (c) 2008 Cisco. All rights reserved.
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
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/fs.h>
41 #include <linux/cdev.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/kref.h>
46 #include <linux/compat.h>
47 #include <linux/sched.h>
48 #include <linux/semaphore.h>
49 #include <linux/slab.h>
50
51 #include <asm/uaccess.h>
52
53 #include <rdma/ib_mad.h>
54 #include <rdma/ib_user_mad.h>
55
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 enum {
61 IB_UMAD_MAX_PORTS = 64,
62 IB_UMAD_MAX_AGENTS = 32,
63
64 IB_UMAD_MAJOR = 231,
65 IB_UMAD_MINOR_BASE = 0
66 };
67
68 /*
69 * Our lifetime rules for these structs are the following:
70 * device special file is opened, we take a reference on the
71 * ib_umad_port's struct ib_umad_device. We drop these
72 * references in the corresponding close().
73 *
74 * In addition to references coming from open character devices, there
75 * is one more reference to each ib_umad_device representing the
76 * module's reference taken when allocating the ib_umad_device in
77 * ib_umad_add_one().
78 *
79 * When destroying an ib_umad_device, we drop the module's reference.
80 */
81
82 struct ib_umad_port {
83 struct cdev cdev;
84 struct device *dev;
85
86 struct cdev sm_cdev;
87 struct device *sm_dev;
88 struct semaphore sm_sem;
89
90 struct mutex file_mutex;
91 struct list_head file_list;
92
93 struct ib_device *ib_dev;
94 struct ib_umad_device *umad_dev;
95 int dev_num;
96 u8 port_num;
97 };
98
99 struct ib_umad_device {
100 int start_port, end_port;
101 struct kref ref;
102 struct ib_umad_port port[0];
103 };
104
105 struct ib_umad_file {
106 struct mutex mutex;
107 struct ib_umad_port *port;
108 struct list_head recv_list;
109 struct list_head send_list;
110 struct list_head port_list;
111 spinlock_t send_lock;
112 wait_queue_head_t recv_wait;
113 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
114 int agents_dead;
115 u8 use_pkey_index;
116 u8 already_used;
117 };
118
119 struct ib_umad_packet {
120 struct ib_mad_send_buf *msg;
121 struct ib_mad_recv_wc *recv_wc;
122 struct list_head list;
123 int length;
124 struct ib_user_mad mad;
125 };
126
127 static struct class *umad_class;
128
129 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
130
131 static DEFINE_SPINLOCK(port_lock);
132 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
133
134 static void ib_umad_add_one(struct ib_device *device);
135 static void ib_umad_remove_one(struct ib_device *device);
136
137 static void ib_umad_release_dev(struct kref *ref)
138 {
139 struct ib_umad_device *dev =
140 container_of(ref, struct ib_umad_device, ref);
141
142 kfree(dev);
143 }
144
145 static int hdr_size(struct ib_umad_file *file)
146 {
147 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
148 sizeof (struct ib_user_mad_hdr_old);
149 }
150
151 /* caller must hold file->mutex */
152 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
153 {
154 return file->agents_dead ? NULL : file->agent[id];
155 }
156
157 static int queue_packet(struct ib_umad_file *file,
158 struct ib_mad_agent *agent,
159 struct ib_umad_packet *packet)
160 {
161 int ret = 1;
162
163 mutex_lock(&file->mutex);
164
165 for (packet->mad.hdr.id = 0;
166 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
167 packet->mad.hdr.id++)
168 if (agent == __get_agent(file, packet->mad.hdr.id)) {
169 list_add_tail(&packet->list, &file->recv_list);
170 wake_up_interruptible(&file->recv_wait);
171 ret = 0;
172 break;
173 }
174
175 mutex_unlock(&file->mutex);
176
177 return ret;
178 }
179
180 static void dequeue_send(struct ib_umad_file *file,
181 struct ib_umad_packet *packet)
182 {
183 spin_lock_irq(&file->send_lock);
184 list_del(&packet->list);
185 spin_unlock_irq(&file->send_lock);
186 }
187
188 static void send_handler(struct ib_mad_agent *agent,
189 struct ib_mad_send_wc *send_wc)
190 {
191 struct ib_umad_file *file = agent->context;
192 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
193
194 dequeue_send(file, packet);
195 ib_destroy_ah(packet->msg->ah);
196 ib_free_send_mad(packet->msg);
197
198 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
199 packet->length = IB_MGMT_MAD_HDR;
200 packet->mad.hdr.status = ETIMEDOUT;
201 if (!queue_packet(file, agent, packet))
202 return;
203 }
204 kfree(packet);
205 }
206
207 static void recv_handler(struct ib_mad_agent *agent,
208 struct ib_mad_recv_wc *mad_recv_wc)
209 {
210 struct ib_umad_file *file = agent->context;
211 struct ib_umad_packet *packet;
212
213 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
214 goto err1;
215
216 packet = kzalloc(sizeof *packet, GFP_KERNEL);
217 if (!packet)
218 goto err1;
219
220 packet->length = mad_recv_wc->mad_len;
221 packet->recv_wc = mad_recv_wc;
222
223 packet->mad.hdr.status = 0;
224 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
225 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
226 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
227 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
228 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
229 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
230 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
231 if (packet->mad.hdr.grh_present) {
232 struct ib_ah_attr ah_attr;
233
234 ib_init_ah_from_wc(agent->device, agent->port_num,
235 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
236 &ah_attr);
237
238 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
239 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
240 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
241 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
242 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
243 }
244
245 if (queue_packet(file, agent, packet))
246 goto err2;
247 return;
248
249 err2:
250 kfree(packet);
251 err1:
252 ib_free_recv_mad(mad_recv_wc);
253 }
254
255 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
256 struct ib_umad_packet *packet, size_t count)
257 {
258 struct ib_mad_recv_buf *recv_buf;
259 int left, seg_payload, offset, max_seg_payload;
260
261 /* We need enough room to copy the first (or only) MAD segment. */
262 recv_buf = &packet->recv_wc->recv_buf;
263 if ((packet->length <= sizeof (*recv_buf->mad) &&
264 count < hdr_size(file) + packet->length) ||
265 (packet->length > sizeof (*recv_buf->mad) &&
266 count < hdr_size(file) + sizeof (*recv_buf->mad)))
267 return -EINVAL;
268
269 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
270 return -EFAULT;
271
272 buf += hdr_size(file);
273 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
274 if (copy_to_user(buf, recv_buf->mad, seg_payload))
275 return -EFAULT;
276
277 if (seg_payload < packet->length) {
278 /*
279 * Multipacket RMPP MAD message. Copy remainder of message.
280 * Note that last segment may have a shorter payload.
281 */
282 if (count < hdr_size(file) + packet->length) {
283 /*
284 * The buffer is too small, return the first RMPP segment,
285 * which includes the RMPP message length.
286 */
287 return -ENOSPC;
288 }
289 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
290 max_seg_payload = sizeof (struct ib_mad) - offset;
291
292 for (left = packet->length - seg_payload, buf += seg_payload;
293 left; left -= seg_payload, buf += seg_payload) {
294 recv_buf = container_of(recv_buf->list.next,
295 struct ib_mad_recv_buf, list);
296 seg_payload = min(left, max_seg_payload);
297 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
298 seg_payload))
299 return -EFAULT;
300 }
301 }
302 return hdr_size(file) + packet->length;
303 }
304
305 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
306 struct ib_umad_packet *packet, size_t count)
307 {
308 ssize_t size = hdr_size(file) + packet->length;
309
310 if (count < size)
311 return -EINVAL;
312
313 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
314 return -EFAULT;
315
316 buf += hdr_size(file);
317
318 if (copy_to_user(buf, packet->mad.data, packet->length))
319 return -EFAULT;
320
321 return size;
322 }
323
324 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
325 size_t count, loff_t *pos)
326 {
327 struct ib_umad_file *file = filp->private_data;
328 struct ib_umad_packet *packet;
329 ssize_t ret;
330
331 if (count < hdr_size(file))
332 return -EINVAL;
333
334 mutex_lock(&file->mutex);
335
336 while (list_empty(&file->recv_list)) {
337 mutex_unlock(&file->mutex);
338
339 if (filp->f_flags & O_NONBLOCK)
340 return -EAGAIN;
341
342 if (wait_event_interruptible(file->recv_wait,
343 !list_empty(&file->recv_list)))
344 return -ERESTARTSYS;
345
346 mutex_lock(&file->mutex);
347 }
348
349 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
350 list_del(&packet->list);
351
352 mutex_unlock(&file->mutex);
353
354 if (packet->recv_wc)
355 ret = copy_recv_mad(file, buf, packet, count);
356 else
357 ret = copy_send_mad(file, buf, packet, count);
358
359 if (ret < 0) {
360 /* Requeue packet */
361 mutex_lock(&file->mutex);
362 list_add(&packet->list, &file->recv_list);
363 mutex_unlock(&file->mutex);
364 } else {
365 if (packet->recv_wc)
366 ib_free_recv_mad(packet->recv_wc);
367 kfree(packet);
368 }
369 return ret;
370 }
371
372 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
373 {
374 int left, seg;
375
376 /* Copy class specific header */
377 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
378 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
379 msg->hdr_len - IB_MGMT_RMPP_HDR))
380 return -EFAULT;
381
382 /* All headers are in place. Copy data segments. */
383 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
384 seg++, left -= msg->seg_size, buf += msg->seg_size) {
385 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
386 min(left, msg->seg_size)))
387 return -EFAULT;
388 }
389 return 0;
390 }
391
392 static int same_destination(struct ib_user_mad_hdr *hdr1,
393 struct ib_user_mad_hdr *hdr2)
394 {
395 if (!hdr1->grh_present && !hdr2->grh_present)
396 return (hdr1->lid == hdr2->lid);
397
398 if (hdr1->grh_present && hdr2->grh_present)
399 return !memcmp(hdr1->gid, hdr2->gid, 16);
400
401 return 0;
402 }
403
404 static int is_duplicate(struct ib_umad_file *file,
405 struct ib_umad_packet *packet)
406 {
407 struct ib_umad_packet *sent_packet;
408 struct ib_mad_hdr *sent_hdr, *hdr;
409
410 hdr = (struct ib_mad_hdr *) packet->mad.data;
411 list_for_each_entry(sent_packet, &file->send_list, list) {
412 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
413
414 if ((hdr->tid != sent_hdr->tid) ||
415 (hdr->mgmt_class != sent_hdr->mgmt_class))
416 continue;
417
418 /*
419 * No need to be overly clever here. If two new operations have
420 * the same TID, reject the second as a duplicate. This is more
421 * restrictive than required by the spec.
422 */
423 if (!ib_response_mad((struct ib_mad *) hdr)) {
424 if (!ib_response_mad((struct ib_mad *) sent_hdr))
425 return 1;
426 continue;
427 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
428 continue;
429
430 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
431 return 1;
432 }
433
434 return 0;
435 }
436
437 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
438 size_t count, loff_t *pos)
439 {
440 struct ib_umad_file *file = filp->private_data;
441 struct ib_umad_packet *packet;
442 struct ib_mad_agent *agent;
443 struct ib_ah_attr ah_attr;
444 struct ib_ah *ah;
445 struct ib_rmpp_mad *rmpp_mad;
446 __be64 *tid;
447 int ret, data_len, hdr_len, copy_offset, rmpp_active;
448
449 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
450 return -EINVAL;
451
452 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
453 if (!packet)
454 return -ENOMEM;
455
456 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
457 ret = -EFAULT;
458 goto err;
459 }
460
461 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
462 ret = -EINVAL;
463 goto err;
464 }
465
466 buf += hdr_size(file);
467
468 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
469 ret = -EFAULT;
470 goto err;
471 }
472
473 mutex_lock(&file->mutex);
474
475 agent = __get_agent(file, packet->mad.hdr.id);
476 if (!agent) {
477 ret = -EINVAL;
478 goto err_up;
479 }
480
481 memset(&ah_attr, 0, sizeof ah_attr);
482 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
483 ah_attr.sl = packet->mad.hdr.sl;
484 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
485 ah_attr.port_num = file->port->port_num;
486 if (packet->mad.hdr.grh_present) {
487 ah_attr.ah_flags = IB_AH_GRH;
488 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
489 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
490 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
491 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
492 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
493 }
494
495 ah = ib_create_ah(agent->qp->pd, &ah_attr);
496 if (IS_ERR(ah)) {
497 ret = PTR_ERR(ah);
498 goto err_up;
499 }
500
501 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
502 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
503 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
504 copy_offset = IB_MGMT_MAD_HDR;
505 rmpp_active = 0;
506 } else {
507 copy_offset = IB_MGMT_RMPP_HDR;
508 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
509 IB_MGMT_RMPP_FLAG_ACTIVE;
510 }
511
512 data_len = count - hdr_size(file) - hdr_len;
513 packet->msg = ib_create_send_mad(agent,
514 be32_to_cpu(packet->mad.hdr.qpn),
515 packet->mad.hdr.pkey_index, rmpp_active,
516 hdr_len, data_len, GFP_KERNEL);
517 if (IS_ERR(packet->msg)) {
518 ret = PTR_ERR(packet->msg);
519 goto err_ah;
520 }
521
522 packet->msg->ah = ah;
523 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
524 packet->msg->retries = packet->mad.hdr.retries;
525 packet->msg->context[0] = packet;
526
527 /* Copy MAD header. Any RMPP header is already in place. */
528 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
529
530 if (!rmpp_active) {
531 if (copy_from_user(packet->msg->mad + copy_offset,
532 buf + copy_offset,
533 hdr_len + data_len - copy_offset)) {
534 ret = -EFAULT;
535 goto err_msg;
536 }
537 } else {
538 ret = copy_rmpp_mad(packet->msg, buf);
539 if (ret)
540 goto err_msg;
541 }
542
543 /*
544 * Set the high-order part of the transaction ID to make MADs from
545 * different agents unique, and allow routing responses back to the
546 * original requestor.
547 */
548 if (!ib_response_mad(packet->msg->mad)) {
549 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
550 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
551 (be64_to_cpup(tid) & 0xffffffff));
552 rmpp_mad->mad_hdr.tid = *tid;
553 }
554
555 spin_lock_irq(&file->send_lock);
556 ret = is_duplicate(file, packet);
557 if (!ret)
558 list_add_tail(&packet->list, &file->send_list);
559 spin_unlock_irq(&file->send_lock);
560 if (ret) {
561 ret = -EINVAL;
562 goto err_msg;
563 }
564
565 ret = ib_post_send_mad(packet->msg, NULL);
566 if (ret)
567 goto err_send;
568
569 mutex_unlock(&file->mutex);
570 return count;
571
572 err_send:
573 dequeue_send(file, packet);
574 err_msg:
575 ib_free_send_mad(packet->msg);
576 err_ah:
577 ib_destroy_ah(ah);
578 err_up:
579 mutex_unlock(&file->mutex);
580 err:
581 kfree(packet);
582 return ret;
583 }
584
585 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
586 {
587 struct ib_umad_file *file = filp->private_data;
588
589 /* we will always be able to post a MAD send */
590 unsigned int mask = POLLOUT | POLLWRNORM;
591
592 poll_wait(filp, &file->recv_wait, wait);
593
594 if (!list_empty(&file->recv_list))
595 mask |= POLLIN | POLLRDNORM;
596
597 return mask;
598 }
599
600 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
601 int compat_method_mask)
602 {
603 struct ib_user_mad_reg_req ureq;
604 struct ib_mad_reg_req req;
605 struct ib_mad_agent *agent = NULL;
606 int agent_id;
607 int ret;
608
609 mutex_lock(&file->port->file_mutex);
610 mutex_lock(&file->mutex);
611
612 if (!file->port->ib_dev) {
613 ret = -EPIPE;
614 goto out;
615 }
616
617 if (copy_from_user(&ureq, arg, sizeof ureq)) {
618 ret = -EFAULT;
619 goto out;
620 }
621
622 if (ureq.qpn != 0 && ureq.qpn != 1) {
623 ret = -EINVAL;
624 goto out;
625 }
626
627 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
628 if (!__get_agent(file, agent_id))
629 goto found;
630
631 ret = -ENOMEM;
632 goto out;
633
634 found:
635 if (ureq.mgmt_class) {
636 req.mgmt_class = ureq.mgmt_class;
637 req.mgmt_class_version = ureq.mgmt_class_version;
638 memcpy(req.oui, ureq.oui, sizeof req.oui);
639
640 if (compat_method_mask) {
641 u32 *umm = (u32 *) ureq.method_mask;
642 int i;
643
644 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
645 req.method_mask[i] =
646 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
647 } else
648 memcpy(req.method_mask, ureq.method_mask,
649 sizeof req.method_mask);
650 }
651
652 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
653 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
654 ureq.mgmt_class ? &req : NULL,
655 ureq.rmpp_version,
656 send_handler, recv_handler, file);
657 if (IS_ERR(agent)) {
658 ret = PTR_ERR(agent);
659 agent = NULL;
660 goto out;
661 }
662
663 if (put_user(agent_id,
664 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
665 ret = -EFAULT;
666 goto out;
667 }
668
669 if (!file->already_used) {
670 file->already_used = 1;
671 if (!file->use_pkey_index) {
672 printk(KERN_WARNING "user_mad: process %s did not enable "
673 "P_Key index support.\n", current->comm);
674 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
675 "has info on the new ABI.\n");
676 }
677 }
678
679 file->agent[agent_id] = agent;
680 ret = 0;
681
682 out:
683 mutex_unlock(&file->mutex);
684
685 if (ret && agent)
686 ib_unregister_mad_agent(agent);
687
688 mutex_unlock(&file->port->file_mutex);
689
690 return ret;
691 }
692
693 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
694 {
695 struct ib_mad_agent *agent = NULL;
696 u32 id;
697 int ret = 0;
698
699 if (get_user(id, arg))
700 return -EFAULT;
701
702 mutex_lock(&file->port->file_mutex);
703 mutex_lock(&file->mutex);
704
705 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
706 ret = -EINVAL;
707 goto out;
708 }
709
710 agent = file->agent[id];
711 file->agent[id] = NULL;
712
713 out:
714 mutex_unlock(&file->mutex);
715
716 if (agent)
717 ib_unregister_mad_agent(agent);
718
719 mutex_unlock(&file->port->file_mutex);
720
721 return ret;
722 }
723
724 static long ib_umad_enable_pkey(struct ib_umad_file *file)
725 {
726 int ret = 0;
727
728 mutex_lock(&file->mutex);
729 if (file->already_used)
730 ret = -EINVAL;
731 else
732 file->use_pkey_index = 1;
733 mutex_unlock(&file->mutex);
734
735 return ret;
736 }
737
738 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
739 unsigned long arg)
740 {
741 switch (cmd) {
742 case IB_USER_MAD_REGISTER_AGENT:
743 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
744 case IB_USER_MAD_UNREGISTER_AGENT:
745 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
746 case IB_USER_MAD_ENABLE_PKEY:
747 return ib_umad_enable_pkey(filp->private_data);
748 default:
749 return -ENOIOCTLCMD;
750 }
751 }
752
753 #ifdef CONFIG_COMPAT
754 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
755 unsigned long arg)
756 {
757 switch (cmd) {
758 case IB_USER_MAD_REGISTER_AGENT:
759 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
760 case IB_USER_MAD_UNREGISTER_AGENT:
761 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
762 case IB_USER_MAD_ENABLE_PKEY:
763 return ib_umad_enable_pkey(filp->private_data);
764 default:
765 return -ENOIOCTLCMD;
766 }
767 }
768 #endif
769
770 /*
771 * ib_umad_open() does not need the BKL:
772 *
773 * - the ib_umad_port structures are properly reference counted, and
774 * everything else is purely local to the file being created, so
775 * races against other open calls are not a problem;
776 * - the ioctl method does not affect any global state outside of the
777 * file structure being operated on;
778 */
779 static int ib_umad_open(struct inode *inode, struct file *filp)
780 {
781 struct ib_umad_port *port;
782 struct ib_umad_file *file;
783 int ret;
784
785 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
786 if (port)
787 kref_get(&port->umad_dev->ref);
788 else
789 return -ENXIO;
790
791 mutex_lock(&port->file_mutex);
792
793 if (!port->ib_dev) {
794 ret = -ENXIO;
795 goto out;
796 }
797
798 file = kzalloc(sizeof *file, GFP_KERNEL);
799 if (!file) {
800 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
801 ret = -ENOMEM;
802 goto out;
803 }
804
805 mutex_init(&file->mutex);
806 spin_lock_init(&file->send_lock);
807 INIT_LIST_HEAD(&file->recv_list);
808 INIT_LIST_HEAD(&file->send_list);
809 init_waitqueue_head(&file->recv_wait);
810
811 file->port = port;
812 filp->private_data = file;
813
814 list_add_tail(&file->port_list, &port->file_list);
815
816 ret = nonseekable_open(inode, filp);
817
818 out:
819 mutex_unlock(&port->file_mutex);
820 return ret;
821 }
822
823 static int ib_umad_close(struct inode *inode, struct file *filp)
824 {
825 struct ib_umad_file *file = filp->private_data;
826 struct ib_umad_device *dev = file->port->umad_dev;
827 struct ib_umad_packet *packet, *tmp;
828 int already_dead;
829 int i;
830
831 mutex_lock(&file->port->file_mutex);
832 mutex_lock(&file->mutex);
833
834 already_dead = file->agents_dead;
835 file->agents_dead = 1;
836
837 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
838 if (packet->recv_wc)
839 ib_free_recv_mad(packet->recv_wc);
840 kfree(packet);
841 }
842
843 list_del(&file->port_list);
844
845 mutex_unlock(&file->mutex);
846
847 if (!already_dead)
848 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
849 if (file->agent[i])
850 ib_unregister_mad_agent(file->agent[i]);
851
852 mutex_unlock(&file->port->file_mutex);
853
854 kfree(file);
855 kref_put(&dev->ref, ib_umad_release_dev);
856
857 return 0;
858 }
859
860 static const struct file_operations umad_fops = {
861 .owner = THIS_MODULE,
862 .read = ib_umad_read,
863 .write = ib_umad_write,
864 .poll = ib_umad_poll,
865 .unlocked_ioctl = ib_umad_ioctl,
866 #ifdef CONFIG_COMPAT
867 .compat_ioctl = ib_umad_compat_ioctl,
868 #endif
869 .open = ib_umad_open,
870 .release = ib_umad_close,
871 .llseek = no_llseek,
872 };
873
874 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
875 {
876 struct ib_umad_port *port;
877 struct ib_port_modify props = {
878 .set_port_cap_mask = IB_PORT_SM
879 };
880 int ret;
881
882 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
883 if (port)
884 kref_get(&port->umad_dev->ref);
885 else
886 return -ENXIO;
887
888 if (filp->f_flags & O_NONBLOCK) {
889 if (down_trylock(&port->sm_sem)) {
890 ret = -EAGAIN;
891 goto fail;
892 }
893 } else {
894 if (down_interruptible(&port->sm_sem)) {
895 ret = -ERESTARTSYS;
896 goto fail;
897 }
898 }
899
900 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
901 if (ret) {
902 up(&port->sm_sem);
903 goto fail;
904 }
905
906 filp->private_data = port;
907
908 return nonseekable_open(inode, filp);
909
910 fail:
911 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
912 return ret;
913 }
914
915 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
916 {
917 struct ib_umad_port *port = filp->private_data;
918 struct ib_port_modify props = {
919 .clr_port_cap_mask = IB_PORT_SM
920 };
921 int ret = 0;
922
923 mutex_lock(&port->file_mutex);
924 if (port->ib_dev)
925 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
926 mutex_unlock(&port->file_mutex);
927
928 up(&port->sm_sem);
929
930 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
931
932 return ret;
933 }
934
935 static const struct file_operations umad_sm_fops = {
936 .owner = THIS_MODULE,
937 .open = ib_umad_sm_open,
938 .release = ib_umad_sm_close,
939 .llseek = no_llseek,
940 };
941
942 static struct ib_client umad_client = {
943 .name = "umad",
944 .add = ib_umad_add_one,
945 .remove = ib_umad_remove_one
946 };
947
948 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
949 char *buf)
950 {
951 struct ib_umad_port *port = dev_get_drvdata(dev);
952
953 if (!port)
954 return -ENODEV;
955
956 return sprintf(buf, "%s\n", port->ib_dev->name);
957 }
958 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
959
960 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
961 char *buf)
962 {
963 struct ib_umad_port *port = dev_get_drvdata(dev);
964
965 if (!port)
966 return -ENODEV;
967
968 return sprintf(buf, "%d\n", port->port_num);
969 }
970 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
971
972 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
973 __stringify(IB_USER_MAD_ABI_VERSION));
974
975 static dev_t overflow_maj;
976 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
977 static int find_overflow_devnum(void)
978 {
979 int ret;
980
981 if (!overflow_maj) {
982 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
983 "infiniband_mad");
984 if (ret) {
985 printk(KERN_ERR "user_mad: couldn't register dynamic device number\n");
986 return ret;
987 }
988 }
989
990 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
991 if (ret >= IB_UMAD_MAX_PORTS)
992 return -1;
993
994 return ret;
995 }
996
997 static int ib_umad_init_port(struct ib_device *device, int port_num,
998 struct ib_umad_port *port)
999 {
1000 int devnum;
1001 dev_t base;
1002
1003 spin_lock(&port_lock);
1004 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1005 if (devnum >= IB_UMAD_MAX_PORTS) {
1006 spin_unlock(&port_lock);
1007 devnum = find_overflow_devnum();
1008 if (devnum < 0)
1009 return -1;
1010
1011 spin_lock(&port_lock);
1012 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1013 base = devnum + overflow_maj;
1014 set_bit(devnum, overflow_map);
1015 } else {
1016 port->dev_num = devnum;
1017 base = devnum + base_dev;
1018 set_bit(devnum, dev_map);
1019 }
1020 spin_unlock(&port_lock);
1021
1022 port->ib_dev = device;
1023 port->port_num = port_num;
1024 sema_init(&port->sm_sem, 1);
1025 mutex_init(&port->file_mutex);
1026 INIT_LIST_HEAD(&port->file_list);
1027
1028 cdev_init(&port->cdev, &umad_fops);
1029 port->cdev.owner = THIS_MODULE;
1030 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1031 if (cdev_add(&port->cdev, base, 1))
1032 goto err_cdev;
1033
1034 port->dev = device_create(umad_class, device->dma_device,
1035 port->cdev.dev, port,
1036 "umad%d", port->dev_num);
1037 if (IS_ERR(port->dev))
1038 goto err_cdev;
1039
1040 if (device_create_file(port->dev, &dev_attr_ibdev))
1041 goto err_dev;
1042 if (device_create_file(port->dev, &dev_attr_port))
1043 goto err_dev;
1044
1045 base += IB_UMAD_MAX_PORTS;
1046 cdev_init(&port->sm_cdev, &umad_sm_fops);
1047 port->sm_cdev.owner = THIS_MODULE;
1048 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1049 if (cdev_add(&port->sm_cdev, base, 1))
1050 goto err_sm_cdev;
1051
1052 port->sm_dev = device_create(umad_class, device->dma_device,
1053 port->sm_cdev.dev, port,
1054 "issm%d", port->dev_num);
1055 if (IS_ERR(port->sm_dev))
1056 goto err_sm_cdev;
1057
1058 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1059 goto err_sm_dev;
1060 if (device_create_file(port->sm_dev, &dev_attr_port))
1061 goto err_sm_dev;
1062
1063 return 0;
1064
1065 err_sm_dev:
1066 device_destroy(umad_class, port->sm_cdev.dev);
1067
1068 err_sm_cdev:
1069 cdev_del(&port->sm_cdev);
1070
1071 err_dev:
1072 device_destroy(umad_class, port->cdev.dev);
1073
1074 err_cdev:
1075 cdev_del(&port->cdev);
1076 if (port->dev_num < IB_UMAD_MAX_PORTS)
1077 clear_bit(devnum, dev_map);
1078 else
1079 clear_bit(devnum, overflow_map);
1080
1081 return -1;
1082 }
1083
1084 static void ib_umad_kill_port(struct ib_umad_port *port)
1085 {
1086 struct ib_umad_file *file;
1087 int id;
1088
1089 dev_set_drvdata(port->dev, NULL);
1090 dev_set_drvdata(port->sm_dev, NULL);
1091
1092 device_destroy(umad_class, port->cdev.dev);
1093 device_destroy(umad_class, port->sm_cdev.dev);
1094
1095 cdev_del(&port->cdev);
1096 cdev_del(&port->sm_cdev);
1097
1098 mutex_lock(&port->file_mutex);
1099
1100 port->ib_dev = NULL;
1101
1102 list_for_each_entry(file, &port->file_list, port_list) {
1103 mutex_lock(&file->mutex);
1104 file->agents_dead = 1;
1105 mutex_unlock(&file->mutex);
1106
1107 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1108 if (file->agent[id])
1109 ib_unregister_mad_agent(file->agent[id]);
1110 }
1111
1112 mutex_unlock(&port->file_mutex);
1113
1114 if (port->dev_num < IB_UMAD_MAX_PORTS)
1115 clear_bit(port->dev_num, dev_map);
1116 else
1117 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1118 }
1119
1120 static void ib_umad_add_one(struct ib_device *device)
1121 {
1122 struct ib_umad_device *umad_dev;
1123 int s, e, i;
1124
1125 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1126 return;
1127
1128 if (device->node_type == RDMA_NODE_IB_SWITCH)
1129 s = e = 0;
1130 else {
1131 s = 1;
1132 e = device->phys_port_cnt;
1133 }
1134
1135 umad_dev = kzalloc(sizeof *umad_dev +
1136 (e - s + 1) * sizeof (struct ib_umad_port),
1137 GFP_KERNEL);
1138 if (!umad_dev)
1139 return;
1140
1141 kref_init(&umad_dev->ref);
1142
1143 umad_dev->start_port = s;
1144 umad_dev->end_port = e;
1145
1146 for (i = s; i <= e; ++i) {
1147 umad_dev->port[i - s].umad_dev = umad_dev;
1148
1149 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1150 goto err;
1151 }
1152
1153 ib_set_client_data(device, &umad_client, umad_dev);
1154
1155 return;
1156
1157 err:
1158 while (--i >= s)
1159 ib_umad_kill_port(&umad_dev->port[i - s]);
1160
1161 kref_put(&umad_dev->ref, ib_umad_release_dev);
1162 }
1163
1164 static void ib_umad_remove_one(struct ib_device *device)
1165 {
1166 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1167 int i;
1168
1169 if (!umad_dev)
1170 return;
1171
1172 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1173 ib_umad_kill_port(&umad_dev->port[i]);
1174
1175 kref_put(&umad_dev->ref, ib_umad_release_dev);
1176 }
1177
1178 static char *umad_devnode(struct device *dev, umode_t *mode)
1179 {
1180 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1181 }
1182
1183 static int __init ib_umad_init(void)
1184 {
1185 int ret;
1186
1187 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1188 "infiniband_mad");
1189 if (ret) {
1190 printk(KERN_ERR "user_mad: couldn't register device number\n");
1191 goto out;
1192 }
1193
1194 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1195 if (IS_ERR(umad_class)) {
1196 ret = PTR_ERR(umad_class);
1197 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1198 goto out_chrdev;
1199 }
1200
1201 umad_class->devnode = umad_devnode;
1202
1203 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1204 if (ret) {
1205 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1206 goto out_class;
1207 }
1208
1209 ret = ib_register_client(&umad_client);
1210 if (ret) {
1211 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1212 goto out_class;
1213 }
1214
1215 return 0;
1216
1217 out_class:
1218 class_destroy(umad_class);
1219
1220 out_chrdev:
1221 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1222
1223 out:
1224 return ret;
1225 }
1226
1227 static void __exit ib_umad_cleanup(void)
1228 {
1229 ib_unregister_client(&umad_client);
1230 class_destroy(umad_class);
1231 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1232 if (overflow_maj)
1233 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1234 }
1235
1236 module_init(ib_umad_init);
1237 module_exit(ib_umad_cleanup);
Linus' kernel tree