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[PATCH] IB: Add copyright notices
[linux-block.git] / drivers / infiniband / core / user_mad.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
2a1d9b7f 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
cb183a06 4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
1da177e4
LT		 5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
cb183a06 34 * $Id: user_mad.c 2814 2005-07-06 19:14:09Z halr $
1da177e4
LT		 35 */
36
37#include <linux/module.h>
38#include <linux/init.h>
39#include <linux/device.h>
40#include <linux/err.h>
41#include <linux/fs.h>
42#include <linux/cdev.h>
43#include <linux/pci.h>
44#include <linux/dma-mapping.h>
45#include <linux/poll.h>
46#include <linux/rwsem.h>
47#include <linux/kref.h>
48
49#include <asm/uaccess.h>
50#include <asm/semaphore.h>
51
52#include <ib_mad.h>
53#include <ib_user_mad.h>
54
55MODULE_AUTHOR("Roland Dreier");
56MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
57MODULE_LICENSE("Dual BSD/GPL");
58
59enum {
60 IB_UMAD_MAX_PORTS = 64,
61 IB_UMAD_MAX_AGENTS = 32,
62
63 IB_UMAD_MAJOR = 231,
64 IB_UMAD_MINOR_BASE = 0
65};
66
67struct ib_umad_port {
68 int devnum;
69 struct cdev dev;
70 struct class_device class_dev;
71
72 int sm_devnum;
73 struct cdev sm_dev;
74 struct class_device sm_class_dev;
75 struct semaphore sm_sem;
76
77 struct ib_device *ib_dev;
78 struct ib_umad_device *umad_dev;
79 u8 port_num;
80};
81
82struct ib_umad_device {
83 int start_port, end_port;
84 struct kref ref;
85 struct ib_umad_port port[0];
86};
87
88struct ib_umad_file {
89 struct ib_umad_port *port;
90 spinlock_t recv_lock;
91 struct list_head recv_list;
92 wait_queue_head_t recv_wait;
93 struct rw_semaphore agent_mutex;
94 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
95 struct ib_mr *mr[IB_UMAD_MAX_AGENTS];
96};
97
98struct ib_umad_packet {
1da177e4 99 struct ib_ah *ah;
cb183a06 100 struct ib_mad_send_buf *msg;
1da177e4 101 struct list_head list;
cb183a06 102 int length;
1da177e4 103 DECLARE_PCI_UNMAP_ADDR(mapping)
cb183a06 104 struct ib_user_mad mad;
1da177e4
LT		 105};
106
107static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
108static spinlock_t map_lock;
109static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
110
111static void ib_umad_add_one(struct ib_device *device);
112static void ib_umad_remove_one(struct ib_device *device);
113
114static int queue_packet(struct ib_umad_file *file,
115 struct ib_mad_agent *agent,
116 struct ib_umad_packet *packet)
117{
118 int ret = 1;
119
120 down_read(&file->agent_mutex);
cb183a06
HR		 121 for (packet->mad.hdr.id = 0;
122 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
123 packet->mad.hdr.id++)
124 if (agent == file->agent[packet->mad.hdr.id]) {
1da177e4
LT		 125 spin_lock_irq(&file->recv_lock);
126 list_add_tail(&packet->list, &file->recv_list);
127 spin_unlock_irq(&file->recv_lock);
128 wake_up_interruptible(&file->recv_wait);
129 ret = 0;
130 break;
131 }
132
133 up_read(&file->agent_mutex);
134
135 return ret;
136}
137
138static void send_handler(struct ib_mad_agent *agent,
139 struct ib_mad_send_wc *send_wc)
140{
141 struct ib_umad_file *file = agent->context;
cb183a06 142 struct ib_umad_packet *timeout, *packet =
1da177e4
LT		 143 (void *) (unsigned long) send_wc->wr_id;
144
cb183a06
HR		 145 ib_destroy_ah(packet->msg->send_wr.wr.ud.ah);
146 ib_free_send_mad(packet->msg);
1da177e4
LT		 147
148 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
cb183a06
HR		 149 timeout = kmalloc(sizeof *timeout + sizeof (struct ib_mad_hdr),
150 GFP_KERNEL);
151 if (!timeout)
152 goto out;
1da177e4 153
cb183a06 154 memset(timeout, 0, sizeof *timeout + sizeof (struct ib_mad_hdr));
1da177e4 155
cb183a06
HR		 156 timeout->length = sizeof (struct ib_mad_hdr);
157 timeout->mad.hdr.id = packet->mad.hdr.id;
158 timeout->mad.hdr.status = ETIMEDOUT;
159 memcpy(timeout->mad.data, packet->mad.data,
160 sizeof (struct ib_mad_hdr));
161
162 if (!queue_packet(file, agent, timeout))
163 return;
164 }
165out:
1da177e4
LT		 166 kfree(packet);
167}
168
169static void recv_handler(struct ib_mad_agent *agent,
170 struct ib_mad_recv_wc *mad_recv_wc)
171{
172 struct ib_umad_file *file = agent->context;
173 struct ib_umad_packet *packet;
cb183a06 174 int length;
1da177e4
LT		 175
176 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
177 goto out;
178
cb183a06
HR		 179 length = mad_recv_wc->mad_len;
180 packet = kmalloc(sizeof *packet + length, GFP_KERNEL);
1da177e4
LT		 181 if (!packet)
182 goto out;
183
cb183a06
HR		 184 memset(packet, 0, sizeof *packet + length);
185 packet->length = length;
186
187 ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data);
1da177e4 188
cb183a06
HR		 189 packet->mad.hdr.status = 0;
190 packet->mad.hdr.length = length + sizeof (struct ib_user_mad);
191 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
192 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
193 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
194 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
195 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
196 if (packet->mad.hdr.grh_present) {
1da177e4 197 /* XXX parse GRH */
cb183a06
HR		 198 packet->mad.hdr.gid_index = 0;
199 packet->mad.hdr.hop_limit = 0;
200 packet->mad.hdr.traffic_class = 0;
201 memset(packet->mad.hdr.gid, 0, 16);
202 packet->mad.hdr.flow_label = 0;
1da177e4
LT		 203 }
204
205 if (queue_packet(file, agent, packet))
206 kfree(packet);
207
208out:
209 ib_free_recv_mad(mad_recv_wc);
210}
211
212static ssize_t ib_umad_read(struct file *filp, char __user *buf,
213 size_t count, loff_t *pos)
214{
215 struct ib_umad_file *file = filp->private_data;
216 struct ib_umad_packet *packet;
217 ssize_t ret;
218
cb183a06 219 if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad))
1da177e4
LT		 220 return -EINVAL;
221
222 spin_lock_irq(&file->recv_lock);
223
224 while (list_empty(&file->recv_list)) {
225 spin_unlock_irq(&file->recv_lock);
226
227 if (filp->f_flags & O_NONBLOCK)
228 return -EAGAIN;
229
230 if (wait_event_interruptible(file->recv_wait,
231 !list_empty(&file->recv_list)))
232 return -ERESTARTSYS;
233
234 spin_lock_irq(&file->recv_lock);
235 }
236
237 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
238 list_del(&packet->list);
239
240 spin_unlock_irq(&file->recv_lock);
241
cb183a06
HR		 242 if (count < packet->length + sizeof (struct ib_user_mad)) {
243 /* Return length needed (and first RMPP segment) if too small */
244 if (copy_to_user(buf, &packet->mad,
245 sizeof (struct ib_user_mad) + sizeof (struct ib_mad)))
246 ret = -EFAULT;
247 else
248 ret = -ENOSPC;
249 } else if (copy_to_user(buf, &packet->mad,
250 packet->length + sizeof (struct ib_user_mad)))
1da177e4
LT		 251 ret = -EFAULT;
252 else
cb183a06
HR		 253 ret = packet->length + sizeof (struct ib_user_mad);
254 if (ret < 0) {
255 /* Requeue packet */
256 spin_lock_irq(&file->recv_lock);
257 list_add(&packet->list, &file->recv_list);
258 spin_unlock_irq(&file->recv_lock);
259 } else
260 kfree(packet);
1da177e4
LT		 261 return ret;
262}
263
264static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
265 size_t count, loff_t *pos)
266{
267 struct ib_umad_file *file = filp->private_data;
268 struct ib_umad_packet *packet;
269 struct ib_mad_agent *agent;
270 struct ib_ah_attr ah_attr;
cb183a06
HR		 271 struct ib_send_wr *bad_wr;
272 struct ib_rmpp_mad *rmpp_mad;
1da177e4
LT		 273 u8 method;
274 u64 *tid;
cb183a06
HR		 275 int ret, length, hdr_len, data_len, rmpp_hdr_size;
276 int rmpp_active = 0;
1da177e4
LT		 277
278 if (count < sizeof (struct ib_user_mad))
279 return -EINVAL;
280
cb183a06
HR		 281 length = count - sizeof (struct ib_user_mad);
282 packet = kmalloc(sizeof *packet + sizeof(struct ib_mad_hdr) +
283 sizeof(struct ib_rmpp_hdr), GFP_KERNEL);
1da177e4
LT		 284 if (!packet)
285 return -ENOMEM;
286
cb183a06
HR		 287 if (copy_from_user(&packet->mad, buf,
288 sizeof (struct ib_user_mad) +
289 sizeof(struct ib_mad_hdr) +
290 sizeof(struct ib_rmpp_hdr))) {
291 ret = -EFAULT;
292 goto err;
1da177e4
LT		 293 }
294
cb183a06
HR		 295 if (packet->mad.hdr.id < 0 ||
296 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
1da177e4
LT		 297 ret = -EINVAL;
298 goto err;
299 }
300
cb183a06
HR		 301 packet->length = length;
302
1da177e4
LT		 303 down_read(&file->agent_mutex);
304
cb183a06 305 agent = file->agent[packet->mad.hdr.id];
1da177e4
LT		 306 if (!agent) {
307 ret = -EINVAL;
308 goto err_up;
309 }
310
1da177e4 311 memset(&ah_attr, 0, sizeof ah_attr);
cb183a06
HR		 312 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
313 ah_attr.sl = packet->mad.hdr.sl;
314 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
1da177e4 315 ah_attr.port_num = file->port->port_num;
cb183a06 316 if (packet->mad.hdr.grh_present) {
1da177e4 317 ah_attr.ah_flags = IB_AH_GRH;
cb183a06
HR		 318 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
319 ah_attr.grh.flow_label = packet->mad.hdr.flow_label;
320 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
321 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
1da177e4
LT		 322 }
323
324 packet->ah = ib_create_ah(agent->qp->pd, &ah_attr);
325 if (IS_ERR(packet->ah)) {
326 ret = PTR_ERR(packet->ah);
327 goto err_up;
328 }
329
cb183a06
HR		 330 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
331 if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) {
332 /* RMPP active */
333 if (!agent->rmpp_version) {
334 ret = -EINVAL;
335 goto err_ah;
336 }
337 /* Validate that management class can support RMPP */
338 if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
339 hdr_len = offsetof(struct ib_sa_mad, data);
340 data_len = length;
341 } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
342 (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) {
343 hdr_len = offsetof(struct ib_vendor_mad, data);
344 data_len = length - hdr_len;
345 } else {
346 ret = -EINVAL;
347 goto err_ah;
348 }
349 rmpp_active = 1;
350 } else {
351 if (length > sizeof(struct ib_mad)) {
352 ret = -EINVAL;
353 goto err_ah;
354 }
355 hdr_len = offsetof(struct ib_mad, data);
356 data_len = length - hdr_len;
357 }
358
359 packet->msg = ib_create_send_mad(agent,
360 be32_to_cpu(packet->mad.hdr.qpn),
361 0, packet->ah, rmpp_active,
362 hdr_len, data_len,
363 GFP_KERNEL);
364 if (IS_ERR(packet->msg)) {
365 ret = PTR_ERR(packet->msg);
366 goto err_ah;
367 }
1da177e4 368
cb183a06
HR		 369 packet->msg->send_wr.wr.ud.timeout_ms = packet->mad.hdr.timeout_ms;
370 packet->msg->send_wr.wr.ud.retries = packet->mad.hdr.retries;
1da177e4 371
cb183a06
HR		 372 /* Override send WR WRID initialized in ib_create_send_mad */
373 packet->msg->send_wr.wr_id = (unsigned long) packet;
1da177e4 374
cb183a06
HR		 375 if (!rmpp_active) {
376 /* Copy message from user into send buffer */
377 if (copy_from_user(packet->msg->mad,
378 buf + sizeof(struct ib_user_mad), length)) {
379 ret = -EFAULT;
380 goto err_msg;
381 }
382 } else {
383 rmpp_hdr_size = sizeof(struct ib_mad_hdr) +
384 sizeof(struct ib_rmpp_hdr);
385
386 /* Only copy MAD headers (RMPP header in place) */
387 memcpy(packet->msg->mad, packet->mad.data,
388 sizeof(struct ib_mad_hdr));
389
390 /* Now, copy rest of message from user into send buffer */
391 if (copy_from_user(((struct ib_rmpp_mad *) packet->msg->mad)->data,
392 buf + sizeof (struct ib_user_mad) + rmpp_hdr_size,
393 length - rmpp_hdr_size)) {
394 ret = -EFAULT;
395 goto err_msg;
396 }
397 }
398
399 /*
400 * If userspace is generating a request that will generate a
401 * response, we need to make sure the high-order part of the
402 * transaction ID matches the agent being used to send the
403 * MAD.
404 */
405 method = packet->msg->mad->mad_hdr.method;
406
407 if (!(method & IB_MGMT_METHOD_RESP) &&
408 method != IB_MGMT_METHOD_TRAP_REPRESS &&
409 method != IB_MGMT_METHOD_SEND) {
410 tid = &packet->msg->mad->mad_hdr.tid;
411 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
412 (be64_to_cpup(tid) & 0xffffffff));
1da177e4
LT		 413 }
414
cb183a06
HR		 415 ret = ib_post_send_mad(agent, &packet->msg->send_wr, &bad_wr);
416 if (ret)
417 goto err_msg;
418
1da177e4
LT		 419 up_read(&file->agent_mutex);
420
cb183a06
HR		 421 return sizeof (struct ib_user_mad_hdr) + packet->length;
422
423err_msg:
424 ib_free_send_mad(packet->msg);
425
426err_ah:
427 ib_destroy_ah(packet->ah);
1da177e4
LT		 428
429err_up:
430 up_read(&file->agent_mutex);
431
432err:
433 kfree(packet);
434 return ret;
435}
436
437static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
438{
439 struct ib_umad_file *file = filp->private_data;
440
441 /* we will always be able to post a MAD send */
442 unsigned int mask = POLLOUT | POLLWRNORM;
443
444 poll_wait(filp, &file->recv_wait, wait);
445
446 if (!list_empty(&file->recv_list))
447 mask |= POLLIN | POLLRDNORM;
448
449 return mask;
450}
451
452static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
453{
454 struct ib_user_mad_reg_req ureq;
455 struct ib_mad_reg_req req;
456 struct ib_mad_agent *agent;
457 int agent_id;
458 int ret;
459
460 down_write(&file->agent_mutex);
461
462 if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
463 ret = -EFAULT;
464 goto out;
465 }
466
467 if (ureq.qpn != 0 && ureq.qpn != 1) {
468 ret = -EINVAL;
469 goto out;
470 }
471
472 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
473 if (!file->agent[agent_id])
474 goto found;
475
476 ret = -ENOMEM;
477 goto out;
478
479found:
0df3bb13
RD		 480 if (ureq.mgmt_class) {
481 req.mgmt_class = ureq.mgmt_class;
482 req.mgmt_class_version = ureq.mgmt_class_version;
483 memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
484 memcpy(req.oui, ureq.oui, sizeof req.oui);
485 }
1da177e4
LT		 486
487 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
488 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
0df3bb13 489 ureq.mgmt_class ? &req : NULL,
cb183a06
HR		 490 ureq.rmpp_version,
491 send_handler, recv_handler, file);
1da177e4
LT		 492 if (IS_ERR(agent)) {
493 ret = PTR_ERR(agent);
494 goto out;
495 }
496
497 file->agent[agent_id] = agent;
498
499 file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE);
500 if (IS_ERR(file->mr[agent_id])) {
501 ret = -ENOMEM;
502 goto err;
503 }
504
505 if (put_user(agent_id,
506 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
507 ret = -EFAULT;
508 goto err_mr;
509 }
510
511 ret = 0;
512 goto out;
513
514err_mr:
515 ib_dereg_mr(file->mr[agent_id]);
516
517err:
518 file->agent[agent_id] = NULL;
519 ib_unregister_mad_agent(agent);
520
521out:
522 up_write(&file->agent_mutex);
523 return ret;
524}
525
526static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
527{
528 u32 id;
529 int ret = 0;
530
531 down_write(&file->agent_mutex);
532
533 if (get_user(id, (u32 __user *) arg)) {
534 ret = -EFAULT;
535 goto out;
536 }
537
538 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
539 ret = -EINVAL;
540 goto out;
541 }
542
543 ib_dereg_mr(file->mr[id]);
544 ib_unregister_mad_agent(file->agent[id]);
545 file->agent[id] = NULL;
546
547out:
548 up_write(&file->agent_mutex);
549 return ret;
550}
551
cb183a06
HR		 552static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
553 unsigned long arg)
1da177e4
LT		 554{
555 switch (cmd) {
556 case IB_USER_MAD_REGISTER_AGENT:
557 return ib_umad_reg_agent(filp->private_data, arg);
558 case IB_USER_MAD_UNREGISTER_AGENT:
559 return ib_umad_unreg_agent(filp->private_data, arg);
560 default:
561 return -ENOIOCTLCMD;
562 }
563}
564
565static int ib_umad_open(struct inode *inode, struct file *filp)
566{
567 struct ib_umad_port *port =
568 container_of(inode->i_cdev, struct ib_umad_port, dev);
569 struct ib_umad_file *file;
570
571 file = kmalloc(sizeof *file, GFP_KERNEL);
572 if (!file)
573 return -ENOMEM;
574
575 memset(file, 0, sizeof *file);
576
577 spin_lock_init(&file->recv_lock);
578 init_rwsem(&file->agent_mutex);
579 INIT_LIST_HEAD(&file->recv_list);
580 init_waitqueue_head(&file->recv_wait);
581
582 file->port = port;
583 filp->private_data = file;
584
585 return 0;
586}
587
588static int ib_umad_close(struct inode *inode, struct file *filp)
589{
590 struct ib_umad_file *file = filp->private_data;
561e148e 591 struct ib_umad_packet *packet, *tmp;
1da177e4
LT		 592 int i;
593
594 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
595 if (file->agent[i]) {
596 ib_dereg_mr(file->mr[i]);
597 ib_unregister_mad_agent(file->agent[i]);
598 }
599
561e148e
RD		 600 list_for_each_entry_safe(packet, tmp, &file->recv_list, list)
601 kfree(packet);
602
1da177e4
LT		 603 kfree(file);
604
605 return 0;
606}
607
608static struct file_operations umad_fops = {
cb183a06
HR		 609 .owner = THIS_MODULE,
610 .read = ib_umad_read,
611 .write = ib_umad_write,
612 .poll = ib_umad_poll,
1da177e4 613 .unlocked_ioctl = ib_umad_ioctl,
cb183a06
HR		 614 .compat_ioctl = ib_umad_ioctl,
615 .open = ib_umad_open,
616 .release = ib_umad_close
1da177e4
LT		 617};
618
619static int ib_umad_sm_open(struct inode *inode, struct file *filp)
620{
621 struct ib_umad_port *port =
622 container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
623 struct ib_port_modify props = {
624 .set_port_cap_mask = IB_PORT_SM
625 };
626 int ret;
627
628 if (filp->f_flags & O_NONBLOCK) {
629 if (down_trylock(&port->sm_sem))
630 return -EAGAIN;
631 } else {
632 if (down_interruptible(&port->sm_sem))
633 return -ERESTARTSYS;
634 }
635
636 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
637 if (ret) {
638 up(&port->sm_sem);
639 return ret;
640 }
641
642 filp->private_data = port;
643
644 return 0;
645}
646
647static int ib_umad_sm_close(struct inode *inode, struct file *filp)
648{
649 struct ib_umad_port *port = filp->private_data;
650 struct ib_port_modify props = {
651 .clr_port_cap_mask = IB_PORT_SM
652 };
653 int ret;
654
655 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
656 up(&port->sm_sem);
657
658 return ret;
659}
660
661static struct file_operations umad_sm_fops = {
662 .owner = THIS_MODULE,
663 .open = ib_umad_sm_open,
664 .release = ib_umad_sm_close
665};
666
667static struct ib_client umad_client = {
668 .name = "umad",
669 .add = ib_umad_add_one,
670 .remove = ib_umad_remove_one
671};
672
673static ssize_t show_dev(struct class_device *class_dev, char *buf)
674{
675 struct ib_umad_port *port = class_get_devdata(class_dev);
676
677 if (class_dev == &port->class_dev)
678 return print_dev_t(buf, port->dev.dev);
679 else
680 return print_dev_t(buf, port->sm_dev.dev);
681}
682static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
683
684static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
685{
686 struct ib_umad_port *port = class_get_devdata(class_dev);
687
688 return sprintf(buf, "%s\n", port->ib_dev->name);
689}
690static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
691
692static ssize_t show_port(struct class_device *class_dev, char *buf)
693{
694 struct ib_umad_port *port = class_get_devdata(class_dev);
695
696 return sprintf(buf, "%d\n", port->port_num);
697}
698static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
699
700static void ib_umad_release_dev(struct kref *ref)
701{
702 struct ib_umad_device *dev =
703 container_of(ref, struct ib_umad_device, ref);
704
705 kfree(dev);
706}
707
708static void ib_umad_release_port(struct class_device *class_dev)
709{
710 struct ib_umad_port *port = class_get_devdata(class_dev);
711
712 if (class_dev == &port->class_dev) {
713 cdev_del(&port->dev);
714 clear_bit(port->devnum, dev_map);
715 } else {
716 cdev_del(&port->sm_dev);
717 clear_bit(port->sm_devnum, dev_map);
718 }
719
720 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
721}
722
723static struct class umad_class = {
724 .name = "infiniband_mad",
725 .release = ib_umad_release_port
726};
727
728static ssize_t show_abi_version(struct class *class, char *buf)
729{
730 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
731}
732static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
733
734static int ib_umad_init_port(struct ib_device *device, int port_num,
735 struct ib_umad_port *port)
736{
737 spin_lock(&map_lock);
738 port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
739 if (port->devnum >= IB_UMAD_MAX_PORTS) {
740 spin_unlock(&map_lock);
741 return -1;
742 }
743 port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
744 if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
745 spin_unlock(&map_lock);
746 return -1;
747 }
748 set_bit(port->devnum, dev_map);
749 set_bit(port->sm_devnum, dev_map);
750 spin_unlock(&map_lock);
751
752 port->ib_dev = device;
753 port->port_num = port_num;
754 init_MUTEX(&port->sm_sem);
755
756 cdev_init(&port->dev, &umad_fops);
757 port->dev.owner = THIS_MODULE;
758 kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
759 if (cdev_add(&port->dev, base_dev + port->devnum, 1))
760 return -1;
761
762 port->class_dev.class = &umad_class;
763 port->class_dev.dev = device->dma_device;
764
765 snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);
766
767 if (class_device_register(&port->class_dev))
768 goto err_cdev;
769
770 class_set_devdata(&port->class_dev, port);
771 kref_get(&port->umad_dev->ref);
772
773 if (class_device_create_file(&port->class_dev, &class_device_attr_dev))
774 goto err_class;
775 if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
776 goto err_class;
777 if (class_device_create_file(&port->class_dev, &class_device_attr_port))
778 goto err_class;
779
780 cdev_init(&port->sm_dev, &umad_sm_fops);
781 port->sm_dev.owner = THIS_MODULE;
782 kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
783 if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
784 return -1;
785
786 port->sm_class_dev.class = &umad_class;
787 port->sm_class_dev.dev = device->dma_device;
788
789 snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
790
791 if (class_device_register(&port->sm_class_dev))
792 goto err_sm_cdev;
793
794 class_set_devdata(&port->sm_class_dev, port);
795 kref_get(&port->umad_dev->ref);
796
797 if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev))
798 goto err_sm_class;
799 if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
800 goto err_sm_class;
801 if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
802 goto err_sm_class;
803
804 return 0;
805
806err_sm_class:
807 class_device_unregister(&port->sm_class_dev);
808
809err_sm_cdev:
810 cdev_del(&port->sm_dev);
811
812err_class:
813 class_device_unregister(&port->class_dev);
814
815err_cdev:
816 cdev_del(&port->dev);
817 clear_bit(port->devnum, dev_map);
818
819 return -1;
820}
821
822static void ib_umad_add_one(struct ib_device *device)
823{
824 struct ib_umad_device *umad_dev;
825 int s, e, i;
826
827 if (device->node_type == IB_NODE_SWITCH)
828 s = e = 0;
829 else {
830 s = 1;
831 e = device->phys_port_cnt;
832 }
833
834 umad_dev = kmalloc(sizeof *umad_dev +
835 (e - s + 1) * sizeof (struct ib_umad_port),
836 GFP_KERNEL);
837 if (!umad_dev)
838 return;
839
840 memset(umad_dev, 0, sizeof *umad_dev +
841 (e - s + 1) * sizeof (struct ib_umad_port));
842
843 kref_init(&umad_dev->ref);
844
845 umad_dev->start_port = s;
846 umad_dev->end_port = e;
847
848 for (i = s; i <= e; ++i) {
849 umad_dev->port[i - s].umad_dev = umad_dev;
850
851 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
852 goto err;
853 }
854
855 ib_set_client_data(device, &umad_client, umad_dev);
856
857 return;
858
859err:
860 while (--i >= s) {
861 class_device_unregister(&umad_dev->port[i - s].class_dev);
862 class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
863 }
864
865 kref_put(&umad_dev->ref, ib_umad_release_dev);
866}
867
868static void ib_umad_remove_one(struct ib_device *device)
869{
870 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
871 int i;
872
873 if (!umad_dev)
874 return;
875
876 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
877 class_device_unregister(&umad_dev->port[i].class_dev);
878 class_device_unregister(&umad_dev->port[i].sm_class_dev);
879 }
880
881 kref_put(&umad_dev->ref, ib_umad_release_dev);
882}
883
884static int __init ib_umad_init(void)
885{
886 int ret;
887
888 spin_lock_init(&map_lock);
889
890 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
891 "infiniband_mad");
892 if (ret) {
893 printk(KERN_ERR "user_mad: couldn't register device number\n");
894 goto out;
895 }
896
897 ret = class_register(&umad_class);
898 if (ret) {
899 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
900 goto out_chrdev;
901 }
902
903 ret = class_create_file(&umad_class, &class_attr_abi_version);
904 if (ret) {
905 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
906 goto out_class;
907 }
908
909 ret = ib_register_client(&umad_client);
910 if (ret) {
911 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
912 goto out_class;
913 }
914
915 return 0;
916
917out_class:
918 class_unregister(&umad_class);
919
920out_chrdev:
921 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
922
923out:
924 return ret;
925}
926
927static void __exit ib_umad_cleanup(void)
928{
929 ib_unregister_client(&umad_client);
930 class_unregister(&umad_class);
931 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
932}
933
934module_init(ib_umad_init);
935module_exit(ib_umad_cleanup);
Linux 6.x block layer and io_uring tree(s)