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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | * $Id: user_mad.c 1389 2004-12-27 22:56:47Z roland $ | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/cdev.h> | |
41 | #include <linux/pci.h> | |
42 | #include <linux/dma-mapping.h> | |
43 | #include <linux/poll.h> | |
44 | #include <linux/rwsem.h> | |
45 | #include <linux/kref.h> | |
46 | ||
47 | #include <asm/uaccess.h> | |
48 | #include <asm/semaphore.h> | |
49 | ||
50 | #include <ib_mad.h> | |
51 | #include <ib_user_mad.h> | |
52 | ||
53 | MODULE_AUTHOR("Roland Dreier"); | |
54 | MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); | |
55 | MODULE_LICENSE("Dual BSD/GPL"); | |
56 | ||
57 | enum { | |
58 | IB_UMAD_MAX_PORTS = 64, | |
59 | IB_UMAD_MAX_AGENTS = 32, | |
60 | ||
61 | IB_UMAD_MAJOR = 231, | |
62 | IB_UMAD_MINOR_BASE = 0 | |
63 | }; | |
64 | ||
65 | struct ib_umad_port { | |
66 | int devnum; | |
67 | struct cdev dev; | |
68 | struct class_device class_dev; | |
69 | ||
70 | int sm_devnum; | |
71 | struct cdev sm_dev; | |
72 | struct class_device sm_class_dev; | |
73 | struct semaphore sm_sem; | |
74 | ||
75 | struct ib_device *ib_dev; | |
76 | struct ib_umad_device *umad_dev; | |
77 | u8 port_num; | |
78 | }; | |
79 | ||
80 | struct ib_umad_device { | |
81 | int start_port, end_port; | |
82 | struct kref ref; | |
83 | struct ib_umad_port port[0]; | |
84 | }; | |
85 | ||
86 | struct ib_umad_file { | |
87 | struct ib_umad_port *port; | |
88 | spinlock_t recv_lock; | |
89 | struct list_head recv_list; | |
90 | wait_queue_head_t recv_wait; | |
91 | struct rw_semaphore agent_mutex; | |
92 | struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; | |
93 | struct ib_mr *mr[IB_UMAD_MAX_AGENTS]; | |
94 | }; | |
95 | ||
96 | struct ib_umad_packet { | |
97 | struct ib_user_mad mad; | |
98 | struct ib_ah *ah; | |
99 | struct list_head list; | |
100 | DECLARE_PCI_UNMAP_ADDR(mapping) | |
101 | }; | |
102 | ||
103 | static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); | |
104 | static spinlock_t map_lock; | |
105 | static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2); | |
106 | ||
107 | static void ib_umad_add_one(struct ib_device *device); | |
108 | static void ib_umad_remove_one(struct ib_device *device); | |
109 | ||
110 | static int queue_packet(struct ib_umad_file *file, | |
111 | struct ib_mad_agent *agent, | |
112 | struct ib_umad_packet *packet) | |
113 | { | |
114 | int ret = 1; | |
115 | ||
116 | down_read(&file->agent_mutex); | |
117 | for (packet->mad.id = 0; | |
118 | packet->mad.id < IB_UMAD_MAX_AGENTS; | |
119 | packet->mad.id++) | |
120 | if (agent == file->agent[packet->mad.id]) { | |
121 | spin_lock_irq(&file->recv_lock); | |
122 | list_add_tail(&packet->list, &file->recv_list); | |
123 | spin_unlock_irq(&file->recv_lock); | |
124 | wake_up_interruptible(&file->recv_wait); | |
125 | ret = 0; | |
126 | break; | |
127 | } | |
128 | ||
129 | up_read(&file->agent_mutex); | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | static void send_handler(struct ib_mad_agent *agent, | |
135 | struct ib_mad_send_wc *send_wc) | |
136 | { | |
137 | struct ib_umad_file *file = agent->context; | |
138 | struct ib_umad_packet *packet = | |
139 | (void *) (unsigned long) send_wc->wr_id; | |
140 | ||
141 | dma_unmap_single(agent->device->dma_device, | |
142 | pci_unmap_addr(packet, mapping), | |
143 | sizeof packet->mad.data, | |
144 | DMA_TO_DEVICE); | |
145 | ib_destroy_ah(packet->ah); | |
146 | ||
147 | if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { | |
148 | packet->mad.status = ETIMEDOUT; | |
149 | ||
150 | if (!queue_packet(file, agent, packet)) | |
151 | return; | |
152 | } | |
153 | ||
154 | kfree(packet); | |
155 | } | |
156 | ||
157 | static void recv_handler(struct ib_mad_agent *agent, | |
158 | struct ib_mad_recv_wc *mad_recv_wc) | |
159 | { | |
160 | struct ib_umad_file *file = agent->context; | |
161 | struct ib_umad_packet *packet; | |
162 | ||
163 | if (mad_recv_wc->wc->status != IB_WC_SUCCESS) | |
164 | goto out; | |
165 | ||
166 | packet = kmalloc(sizeof *packet, GFP_KERNEL); | |
167 | if (!packet) | |
168 | goto out; | |
169 | ||
170 | memset(packet, 0, sizeof *packet); | |
171 | ||
172 | memcpy(packet->mad.data, mad_recv_wc->recv_buf.mad, sizeof packet->mad.data); | |
173 | packet->mad.status = 0; | |
174 | packet->mad.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); | |
175 | packet->mad.lid = cpu_to_be16(mad_recv_wc->wc->slid); | |
176 | packet->mad.sl = mad_recv_wc->wc->sl; | |
177 | packet->mad.path_bits = mad_recv_wc->wc->dlid_path_bits; | |
178 | packet->mad.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); | |
179 | if (packet->mad.grh_present) { | |
180 | /* XXX parse GRH */ | |
181 | packet->mad.gid_index = 0; | |
182 | packet->mad.hop_limit = 0; | |
183 | packet->mad.traffic_class = 0; | |
184 | memset(packet->mad.gid, 0, 16); | |
185 | packet->mad.flow_label = 0; | |
186 | } | |
187 | ||
188 | if (queue_packet(file, agent, packet)) | |
189 | kfree(packet); | |
190 | ||
191 | out: | |
192 | ib_free_recv_mad(mad_recv_wc); | |
193 | } | |
194 | ||
195 | static ssize_t ib_umad_read(struct file *filp, char __user *buf, | |
196 | size_t count, loff_t *pos) | |
197 | { | |
198 | struct ib_umad_file *file = filp->private_data; | |
199 | struct ib_umad_packet *packet; | |
200 | ssize_t ret; | |
201 | ||
202 | if (count < sizeof (struct ib_user_mad)) | |
203 | return -EINVAL; | |
204 | ||
205 | spin_lock_irq(&file->recv_lock); | |
206 | ||
207 | while (list_empty(&file->recv_list)) { | |
208 | spin_unlock_irq(&file->recv_lock); | |
209 | ||
210 | if (filp->f_flags & O_NONBLOCK) | |
211 | return -EAGAIN; | |
212 | ||
213 | if (wait_event_interruptible(file->recv_wait, | |
214 | !list_empty(&file->recv_list))) | |
215 | return -ERESTARTSYS; | |
216 | ||
217 | spin_lock_irq(&file->recv_lock); | |
218 | } | |
219 | ||
220 | packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); | |
221 | list_del(&packet->list); | |
222 | ||
223 | spin_unlock_irq(&file->recv_lock); | |
224 | ||
225 | if (copy_to_user(buf, &packet->mad, sizeof packet->mad)) | |
226 | ret = -EFAULT; | |
227 | else | |
228 | ret = sizeof packet->mad; | |
229 | ||
230 | kfree(packet); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static ssize_t ib_umad_write(struct file *filp, const char __user *buf, | |
235 | size_t count, loff_t *pos) | |
236 | { | |
237 | struct ib_umad_file *file = filp->private_data; | |
238 | struct ib_umad_packet *packet; | |
239 | struct ib_mad_agent *agent; | |
240 | struct ib_ah_attr ah_attr; | |
241 | struct ib_sge gather_list; | |
242 | struct ib_send_wr *bad_wr, wr = { | |
243 | .opcode = IB_WR_SEND, | |
244 | .sg_list = &gather_list, | |
245 | .num_sge = 1, | |
246 | .send_flags = IB_SEND_SIGNALED, | |
247 | }; | |
248 | u8 method; | |
249 | u64 *tid; | |
250 | int ret; | |
251 | ||
252 | if (count < sizeof (struct ib_user_mad)) | |
253 | return -EINVAL; | |
254 | ||
255 | packet = kmalloc(sizeof *packet, GFP_KERNEL); | |
256 | if (!packet) | |
257 | return -ENOMEM; | |
258 | ||
259 | if (copy_from_user(&packet->mad, buf, sizeof packet->mad)) { | |
260 | kfree(packet); | |
261 | return -EFAULT; | |
262 | } | |
263 | ||
264 | if (packet->mad.id < 0 || packet->mad.id >= IB_UMAD_MAX_AGENTS) { | |
265 | ret = -EINVAL; | |
266 | goto err; | |
267 | } | |
268 | ||
269 | down_read(&file->agent_mutex); | |
270 | ||
271 | agent = file->agent[packet->mad.id]; | |
272 | if (!agent) { | |
273 | ret = -EINVAL; | |
274 | goto err_up; | |
275 | } | |
276 | ||
277 | /* | |
278 | * If userspace is generating a request that will generate a | |
279 | * response, we need to make sure the high-order part of the | |
280 | * transaction ID matches the agent being used to send the | |
281 | * MAD. | |
282 | */ | |
283 | method = ((struct ib_mad_hdr *) packet->mad.data)->method; | |
284 | ||
285 | if (!(method & IB_MGMT_METHOD_RESP) && | |
286 | method != IB_MGMT_METHOD_TRAP_REPRESS && | |
287 | method != IB_MGMT_METHOD_SEND) { | |
288 | tid = &((struct ib_mad_hdr *) packet->mad.data)->tid; | |
289 | *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | | |
290 | (be64_to_cpup(tid) & 0xffffffff)); | |
291 | } | |
292 | ||
293 | memset(&ah_attr, 0, sizeof ah_attr); | |
294 | ah_attr.dlid = be16_to_cpu(packet->mad.lid); | |
295 | ah_attr.sl = packet->mad.sl; | |
296 | ah_attr.src_path_bits = packet->mad.path_bits; | |
297 | ah_attr.port_num = file->port->port_num; | |
298 | if (packet->mad.grh_present) { | |
299 | ah_attr.ah_flags = IB_AH_GRH; | |
300 | memcpy(ah_attr.grh.dgid.raw, packet->mad.gid, 16); | |
301 | ah_attr.grh.flow_label = packet->mad.flow_label; | |
302 | ah_attr.grh.hop_limit = packet->mad.hop_limit; | |
303 | ah_attr.grh.traffic_class = packet->mad.traffic_class; | |
304 | } | |
305 | ||
306 | packet->ah = ib_create_ah(agent->qp->pd, &ah_attr); | |
307 | if (IS_ERR(packet->ah)) { | |
308 | ret = PTR_ERR(packet->ah); | |
309 | goto err_up; | |
310 | } | |
311 | ||
312 | gather_list.addr = dma_map_single(agent->device->dma_device, | |
313 | packet->mad.data, | |
314 | sizeof packet->mad.data, | |
315 | DMA_TO_DEVICE); | |
316 | gather_list.length = sizeof packet->mad.data; | |
317 | gather_list.lkey = file->mr[packet->mad.id]->lkey; | |
318 | pci_unmap_addr_set(packet, mapping, gather_list.addr); | |
319 | ||
320 | wr.wr.ud.mad_hdr = (struct ib_mad_hdr *) packet->mad.data; | |
321 | wr.wr.ud.ah = packet->ah; | |
322 | wr.wr.ud.remote_qpn = be32_to_cpu(packet->mad.qpn); | |
323 | wr.wr.ud.remote_qkey = be32_to_cpu(packet->mad.qkey); | |
324 | wr.wr.ud.timeout_ms = packet->mad.timeout_ms; | |
325 | ||
326 | wr.wr_id = (unsigned long) packet; | |
327 | ||
328 | ret = ib_post_send_mad(agent, &wr, &bad_wr); | |
329 | if (ret) { | |
330 | dma_unmap_single(agent->device->dma_device, | |
331 | pci_unmap_addr(packet, mapping), | |
332 | sizeof packet->mad.data, | |
333 | DMA_TO_DEVICE); | |
334 | goto err_up; | |
335 | } | |
336 | ||
337 | up_read(&file->agent_mutex); | |
338 | ||
339 | return sizeof packet->mad; | |
340 | ||
341 | err_up: | |
342 | up_read(&file->agent_mutex); | |
343 | ||
344 | err: | |
345 | kfree(packet); | |
346 | return ret; | |
347 | } | |
348 | ||
349 | static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) | |
350 | { | |
351 | struct ib_umad_file *file = filp->private_data; | |
352 | ||
353 | /* we will always be able to post a MAD send */ | |
354 | unsigned int mask = POLLOUT | POLLWRNORM; | |
355 | ||
356 | poll_wait(filp, &file->recv_wait, wait); | |
357 | ||
358 | if (!list_empty(&file->recv_list)) | |
359 | mask |= POLLIN | POLLRDNORM; | |
360 | ||
361 | return mask; | |
362 | } | |
363 | ||
364 | static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) | |
365 | { | |
366 | struct ib_user_mad_reg_req ureq; | |
367 | struct ib_mad_reg_req req; | |
368 | struct ib_mad_agent *agent; | |
369 | int agent_id; | |
370 | int ret; | |
371 | ||
372 | down_write(&file->agent_mutex); | |
373 | ||
374 | if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { | |
375 | ret = -EFAULT; | |
376 | goto out; | |
377 | } | |
378 | ||
379 | if (ureq.qpn != 0 && ureq.qpn != 1) { | |
380 | ret = -EINVAL; | |
381 | goto out; | |
382 | } | |
383 | ||
384 | for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) | |
385 | if (!file->agent[agent_id]) | |
386 | goto found; | |
387 | ||
388 | ret = -ENOMEM; | |
389 | goto out; | |
390 | ||
391 | found: | |
392 | req.mgmt_class = ureq.mgmt_class; | |
393 | req.mgmt_class_version = ureq.mgmt_class_version; | |
394 | memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); | |
395 | memcpy(req.oui, ureq.oui, sizeof req.oui); | |
396 | ||
397 | agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, | |
398 | ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, | |
399 | &req, 0, send_handler, recv_handler, | |
400 | file); | |
401 | if (IS_ERR(agent)) { | |
402 | ret = PTR_ERR(agent); | |
403 | goto out; | |
404 | } | |
405 | ||
406 | file->agent[agent_id] = agent; | |
407 | ||
408 | file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE); | |
409 | if (IS_ERR(file->mr[agent_id])) { | |
410 | ret = -ENOMEM; | |
411 | goto err; | |
412 | } | |
413 | ||
414 | if (put_user(agent_id, | |
415 | (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { | |
416 | ret = -EFAULT; | |
417 | goto err_mr; | |
418 | } | |
419 | ||
420 | ret = 0; | |
421 | goto out; | |
422 | ||
423 | err_mr: | |
424 | ib_dereg_mr(file->mr[agent_id]); | |
425 | ||
426 | err: | |
427 | file->agent[agent_id] = NULL; | |
428 | ib_unregister_mad_agent(agent); | |
429 | ||
430 | out: | |
431 | up_write(&file->agent_mutex); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) | |
436 | { | |
437 | u32 id; | |
438 | int ret = 0; | |
439 | ||
440 | down_write(&file->agent_mutex); | |
441 | ||
442 | if (get_user(id, (u32 __user *) arg)) { | |
443 | ret = -EFAULT; | |
444 | goto out; | |
445 | } | |
446 | ||
447 | if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) { | |
448 | ret = -EINVAL; | |
449 | goto out; | |
450 | } | |
451 | ||
452 | ib_dereg_mr(file->mr[id]); | |
453 | ib_unregister_mad_agent(file->agent[id]); | |
454 | file->agent[id] = NULL; | |
455 | ||
456 | out: | |
457 | up_write(&file->agent_mutex); | |
458 | return ret; | |
459 | } | |
460 | ||
461 | static long ib_umad_ioctl(struct file *filp, | |
462 | unsigned int cmd, unsigned long arg) | |
463 | { | |
464 | switch (cmd) { | |
465 | case IB_USER_MAD_REGISTER_AGENT: | |
466 | return ib_umad_reg_agent(filp->private_data, arg); | |
467 | case IB_USER_MAD_UNREGISTER_AGENT: | |
468 | return ib_umad_unreg_agent(filp->private_data, arg); | |
469 | default: | |
470 | return -ENOIOCTLCMD; | |
471 | } | |
472 | } | |
473 | ||
474 | static int ib_umad_open(struct inode *inode, struct file *filp) | |
475 | { | |
476 | struct ib_umad_port *port = | |
477 | container_of(inode->i_cdev, struct ib_umad_port, dev); | |
478 | struct ib_umad_file *file; | |
479 | ||
480 | file = kmalloc(sizeof *file, GFP_KERNEL); | |
481 | if (!file) | |
482 | return -ENOMEM; | |
483 | ||
484 | memset(file, 0, sizeof *file); | |
485 | ||
486 | spin_lock_init(&file->recv_lock); | |
487 | init_rwsem(&file->agent_mutex); | |
488 | INIT_LIST_HEAD(&file->recv_list); | |
489 | init_waitqueue_head(&file->recv_wait); | |
490 | ||
491 | file->port = port; | |
492 | filp->private_data = file; | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | static int ib_umad_close(struct inode *inode, struct file *filp) | |
498 | { | |
499 | struct ib_umad_file *file = filp->private_data; | |
500 | int i; | |
501 | ||
502 | for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) | |
503 | if (file->agent[i]) { | |
504 | ib_dereg_mr(file->mr[i]); | |
505 | ib_unregister_mad_agent(file->agent[i]); | |
506 | } | |
507 | ||
508 | kfree(file); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static struct file_operations umad_fops = { | |
514 | .owner = THIS_MODULE, | |
515 | .read = ib_umad_read, | |
516 | .write = ib_umad_write, | |
517 | .poll = ib_umad_poll, | |
518 | .unlocked_ioctl = ib_umad_ioctl, | |
519 | .compat_ioctl = ib_umad_ioctl, | |
520 | .open = ib_umad_open, | |
521 | .release = ib_umad_close | |
522 | }; | |
523 | ||
524 | static int ib_umad_sm_open(struct inode *inode, struct file *filp) | |
525 | { | |
526 | struct ib_umad_port *port = | |
527 | container_of(inode->i_cdev, struct ib_umad_port, sm_dev); | |
528 | struct ib_port_modify props = { | |
529 | .set_port_cap_mask = IB_PORT_SM | |
530 | }; | |
531 | int ret; | |
532 | ||
533 | if (filp->f_flags & O_NONBLOCK) { | |
534 | if (down_trylock(&port->sm_sem)) | |
535 | return -EAGAIN; | |
536 | } else { | |
537 | if (down_interruptible(&port->sm_sem)) | |
538 | return -ERESTARTSYS; | |
539 | } | |
540 | ||
541 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
542 | if (ret) { | |
543 | up(&port->sm_sem); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | filp->private_data = port; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int ib_umad_sm_close(struct inode *inode, struct file *filp) | |
553 | { | |
554 | struct ib_umad_port *port = filp->private_data; | |
555 | struct ib_port_modify props = { | |
556 | .clr_port_cap_mask = IB_PORT_SM | |
557 | }; | |
558 | int ret; | |
559 | ||
560 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
561 | up(&port->sm_sem); | |
562 | ||
563 | return ret; | |
564 | } | |
565 | ||
566 | static struct file_operations umad_sm_fops = { | |
567 | .owner = THIS_MODULE, | |
568 | .open = ib_umad_sm_open, | |
569 | .release = ib_umad_sm_close | |
570 | }; | |
571 | ||
572 | static struct ib_client umad_client = { | |
573 | .name = "umad", | |
574 | .add = ib_umad_add_one, | |
575 | .remove = ib_umad_remove_one | |
576 | }; | |
577 | ||
578 | static ssize_t show_dev(struct class_device *class_dev, char *buf) | |
579 | { | |
580 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
581 | ||
582 | if (class_dev == &port->class_dev) | |
583 | return print_dev_t(buf, port->dev.dev); | |
584 | else | |
585 | return print_dev_t(buf, port->sm_dev.dev); | |
586 | } | |
587 | static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL); | |
588 | ||
589 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) | |
590 | { | |
591 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
592 | ||
593 | return sprintf(buf, "%s\n", port->ib_dev->name); | |
594 | } | |
595 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
596 | ||
597 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
598 | { | |
599 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
600 | ||
601 | return sprintf(buf, "%d\n", port->port_num); | |
602 | } | |
603 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
604 | ||
605 | static void ib_umad_release_dev(struct kref *ref) | |
606 | { | |
607 | struct ib_umad_device *dev = | |
608 | container_of(ref, struct ib_umad_device, ref); | |
609 | ||
610 | kfree(dev); | |
611 | } | |
612 | ||
613 | static void ib_umad_release_port(struct class_device *class_dev) | |
614 | { | |
615 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
616 | ||
617 | if (class_dev == &port->class_dev) { | |
618 | cdev_del(&port->dev); | |
619 | clear_bit(port->devnum, dev_map); | |
620 | } else { | |
621 | cdev_del(&port->sm_dev); | |
622 | clear_bit(port->sm_devnum, dev_map); | |
623 | } | |
624 | ||
625 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
626 | } | |
627 | ||
628 | static struct class umad_class = { | |
629 | .name = "infiniband_mad", | |
630 | .release = ib_umad_release_port | |
631 | }; | |
632 | ||
633 | static ssize_t show_abi_version(struct class *class, char *buf) | |
634 | { | |
635 | return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); | |
636 | } | |
637 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
638 | ||
639 | static int ib_umad_init_port(struct ib_device *device, int port_num, | |
640 | struct ib_umad_port *port) | |
641 | { | |
642 | spin_lock(&map_lock); | |
643 | port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); | |
644 | if (port->devnum >= IB_UMAD_MAX_PORTS) { | |
645 | spin_unlock(&map_lock); | |
646 | return -1; | |
647 | } | |
648 | port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS); | |
649 | if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) { | |
650 | spin_unlock(&map_lock); | |
651 | return -1; | |
652 | } | |
653 | set_bit(port->devnum, dev_map); | |
654 | set_bit(port->sm_devnum, dev_map); | |
655 | spin_unlock(&map_lock); | |
656 | ||
657 | port->ib_dev = device; | |
658 | port->port_num = port_num; | |
659 | init_MUTEX(&port->sm_sem); | |
660 | ||
661 | cdev_init(&port->dev, &umad_fops); | |
662 | port->dev.owner = THIS_MODULE; | |
663 | kobject_set_name(&port->dev.kobj, "umad%d", port->devnum); | |
664 | if (cdev_add(&port->dev, base_dev + port->devnum, 1)) | |
665 | return -1; | |
666 | ||
667 | port->class_dev.class = &umad_class; | |
668 | port->class_dev.dev = device->dma_device; | |
669 | ||
670 | snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum); | |
671 | ||
672 | if (class_device_register(&port->class_dev)) | |
673 | goto err_cdev; | |
674 | ||
675 | class_set_devdata(&port->class_dev, port); | |
676 | kref_get(&port->umad_dev->ref); | |
677 | ||
678 | if (class_device_create_file(&port->class_dev, &class_device_attr_dev)) | |
679 | goto err_class; | |
680 | if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev)) | |
681 | goto err_class; | |
682 | if (class_device_create_file(&port->class_dev, &class_device_attr_port)) | |
683 | goto err_class; | |
684 | ||
685 | cdev_init(&port->sm_dev, &umad_sm_fops); | |
686 | port->sm_dev.owner = THIS_MODULE; | |
687 | kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS); | |
688 | if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1)) | |
689 | return -1; | |
690 | ||
691 | port->sm_class_dev.class = &umad_class; | |
692 | port->sm_class_dev.dev = device->dma_device; | |
693 | ||
694 | snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS); | |
695 | ||
696 | if (class_device_register(&port->sm_class_dev)) | |
697 | goto err_sm_cdev; | |
698 | ||
699 | class_set_devdata(&port->sm_class_dev, port); | |
700 | kref_get(&port->umad_dev->ref); | |
701 | ||
702 | if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev)) | |
703 | goto err_sm_class; | |
704 | if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev)) | |
705 | goto err_sm_class; | |
706 | if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port)) | |
707 | goto err_sm_class; | |
708 | ||
709 | return 0; | |
710 | ||
711 | err_sm_class: | |
712 | class_device_unregister(&port->sm_class_dev); | |
713 | ||
714 | err_sm_cdev: | |
715 | cdev_del(&port->sm_dev); | |
716 | ||
717 | err_class: | |
718 | class_device_unregister(&port->class_dev); | |
719 | ||
720 | err_cdev: | |
721 | cdev_del(&port->dev); | |
722 | clear_bit(port->devnum, dev_map); | |
723 | ||
724 | return -1; | |
725 | } | |
726 | ||
727 | static void ib_umad_add_one(struct ib_device *device) | |
728 | { | |
729 | struct ib_umad_device *umad_dev; | |
730 | int s, e, i; | |
731 | ||
732 | if (device->node_type == IB_NODE_SWITCH) | |
733 | s = e = 0; | |
734 | else { | |
735 | s = 1; | |
736 | e = device->phys_port_cnt; | |
737 | } | |
738 | ||
739 | umad_dev = kmalloc(sizeof *umad_dev + | |
740 | (e - s + 1) * sizeof (struct ib_umad_port), | |
741 | GFP_KERNEL); | |
742 | if (!umad_dev) | |
743 | return; | |
744 | ||
745 | memset(umad_dev, 0, sizeof *umad_dev + | |
746 | (e - s + 1) * sizeof (struct ib_umad_port)); | |
747 | ||
748 | kref_init(&umad_dev->ref); | |
749 | ||
750 | umad_dev->start_port = s; | |
751 | umad_dev->end_port = e; | |
752 | ||
753 | for (i = s; i <= e; ++i) { | |
754 | umad_dev->port[i - s].umad_dev = umad_dev; | |
755 | ||
756 | if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) | |
757 | goto err; | |
758 | } | |
759 | ||
760 | ib_set_client_data(device, &umad_client, umad_dev); | |
761 | ||
762 | return; | |
763 | ||
764 | err: | |
765 | while (--i >= s) { | |
766 | class_device_unregister(&umad_dev->port[i - s].class_dev); | |
767 | class_device_unregister(&umad_dev->port[i - s].sm_class_dev); | |
768 | } | |
769 | ||
770 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
771 | } | |
772 | ||
773 | static void ib_umad_remove_one(struct ib_device *device) | |
774 | { | |
775 | struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); | |
776 | int i; | |
777 | ||
778 | if (!umad_dev) | |
779 | return; | |
780 | ||
781 | for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) { | |
782 | class_device_unregister(&umad_dev->port[i].class_dev); | |
783 | class_device_unregister(&umad_dev->port[i].sm_class_dev); | |
784 | } | |
785 | ||
786 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
787 | } | |
788 | ||
789 | static int __init ib_umad_init(void) | |
790 | { | |
791 | int ret; | |
792 | ||
793 | spin_lock_init(&map_lock); | |
794 | ||
795 | ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, | |
796 | "infiniband_mad"); | |
797 | if (ret) { | |
798 | printk(KERN_ERR "user_mad: couldn't register device number\n"); | |
799 | goto out; | |
800 | } | |
801 | ||
802 | ret = class_register(&umad_class); | |
803 | if (ret) { | |
804 | printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); | |
805 | goto out_chrdev; | |
806 | } | |
807 | ||
808 | ret = class_create_file(&umad_class, &class_attr_abi_version); | |
809 | if (ret) { | |
810 | printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); | |
811 | goto out_class; | |
812 | } | |
813 | ||
814 | ret = ib_register_client(&umad_client); | |
815 | if (ret) { | |
816 | printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); | |
817 | goto out_class; | |
818 | } | |
819 | ||
820 | return 0; | |
821 | ||
822 | out_class: | |
823 | class_unregister(&umad_class); | |
824 | ||
825 | out_chrdev: | |
826 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
827 | ||
828 | out: | |
829 | return ret; | |
830 | } | |
831 | ||
832 | static void __exit ib_umad_cleanup(void) | |
833 | { | |
834 | ib_unregister_client(&umad_client); | |
835 | class_unregister(&umad_class); | |
836 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
837 | } | |
838 | ||
839 | module_init(ib_umad_init); | |
840 | module_exit(ib_umad_cleanup); |