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1/*
2 * ipmi_devintf.c
3 *
4 * Linux device interface for the IPMI message handler.
5 *
6 * Author: MontaVista Software, Inc.
7 * Corey Minyard <minyard@mvista.com>
8 * source@mvista.com
9 *
10 * Copyright 2002 MontaVista Software Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
27 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/errno.h>
37#include <asm/system.h>
38#include <linux/poll.h>
39#include <linux/sched.h>
40#include <linux/spinlock.h>
41#include <linux/slab.h>
42#include <linux/ipmi.h>
43#include <linux/mutex.h>
44#include <linux/init.h>
45#include <linux/device.h>
46#include <linux/compat.h>
47
48struct ipmi_file_private
49{
50 ipmi_user_t user;
51 spinlock_t recv_msg_lock;
52 struct list_head recv_msgs;
53 struct file *file;
54 struct fasync_struct *fasync_queue;
55 wait_queue_head_t wait;
56 struct mutex recv_mutex;
57 int default_retries;
58 unsigned int default_retry_time_ms;
59};
60
61static DEFINE_MUTEX(ipmi_mutex);
62static void file_receive_handler(struct ipmi_recv_msg *msg,
63 void *handler_data)
64{
65 struct ipmi_file_private *priv = handler_data;
66 int was_empty;
67 unsigned long flags;
68
69 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
70
71 was_empty = list_empty(&(priv->recv_msgs));
72 list_add_tail(&(msg->link), &(priv->recv_msgs));
73
74 if (was_empty) {
75 wake_up_interruptible(&priv->wait);
76 kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
77 }
78
79 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
80}
81
82static unsigned int ipmi_poll(struct file *file, poll_table *wait)
83{
84 struct ipmi_file_private *priv = file->private_data;
85 unsigned int mask = 0;
86 unsigned long flags;
87
88 poll_wait(file, &priv->wait, wait);
89
90 spin_lock_irqsave(&priv->recv_msg_lock, flags);
91
92 if (!list_empty(&(priv->recv_msgs)))
93 mask |= (POLLIN | POLLRDNORM);
94
95 spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
96
97 return mask;
98}
99
100static int ipmi_fasync(int fd, struct file *file, int on)
101{
102 struct ipmi_file_private *priv = file->private_data;
103 int result;
104
105 mutex_lock(&ipmi_mutex); /* could race against open() otherwise */
106 result = fasync_helper(fd, file, on, &priv->fasync_queue);
107 mutex_unlock(&ipmi_mutex);
108
109 return (result);
110}
111
112static struct ipmi_user_hndl ipmi_hndlrs =
113{
114 .ipmi_recv_hndl = file_receive_handler,
115};
116
117static int ipmi_open(struct inode *inode, struct file *file)
118{
119 int if_num = iminor(inode);
120 int rv;
121 struct ipmi_file_private *priv;
122
123
124 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
125 if (!priv)
126 return -ENOMEM;
127
128 mutex_lock(&ipmi_mutex);
129 priv->file = file;
130
131 rv = ipmi_create_user(if_num,
132 &ipmi_hndlrs,
133 priv,
134 &(priv->user));
135 if (rv) {
136 kfree(priv);
137 goto out;
138 }
139
140 file->private_data = priv;
141
142 spin_lock_init(&(priv->recv_msg_lock));
143 INIT_LIST_HEAD(&(priv->recv_msgs));
144 init_waitqueue_head(&priv->wait);
145 priv->fasync_queue = NULL;
146 mutex_init(&priv->recv_mutex);
147
148 /* Use the low-level defaults. */
149 priv->default_retries = -1;
150 priv->default_retry_time_ms = 0;
151
152out:
153 mutex_unlock(&ipmi_mutex);
154 return rv;
155}
156
157static int ipmi_release(struct inode *inode, struct file *file)
158{
159 struct ipmi_file_private *priv = file->private_data;
160 int rv;
161
162 rv = ipmi_destroy_user(priv->user);
163 if (rv)
164 return rv;
165
166 /* FIXME - free the messages in the list. */
167 kfree(priv);
168
169 return 0;
170}
171
172static int handle_send_req(ipmi_user_t user,
173 struct ipmi_req *req,
174 int retries,
175 unsigned int retry_time_ms)
176{
177 int rv;
178 struct ipmi_addr addr;
179 struct kernel_ipmi_msg msg;
180
181 if (req->addr_len > sizeof(struct ipmi_addr))
182 return -EINVAL;
183
184 if (copy_from_user(&addr, req->addr, req->addr_len))
185 return -EFAULT;
186
187 msg.netfn = req->msg.netfn;
188 msg.cmd = req->msg.cmd;
189 msg.data_len = req->msg.data_len;
190 msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
191 if (!msg.data)
192 return -ENOMEM;
193
194 /* From here out we cannot return, we must jump to "out" for
195 error exits to free msgdata. */
196
197 rv = ipmi_validate_addr(&addr, req->addr_len);
198 if (rv)
199 goto out;
200
201 if (req->msg.data != NULL) {
202 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
203 rv = -EMSGSIZE;
204 goto out;
205 }
206
207 if (copy_from_user(msg.data,
208 req->msg.data,
209 req->msg.data_len))
210 {
211 rv = -EFAULT;
212 goto out;
213 }
214 } else {
215 msg.data_len = 0;
216 }
217
218 rv = ipmi_request_settime(user,
219 &addr,
220 req->msgid,
221 &msg,
222 NULL,
223 0,
224 retries,
225 retry_time_ms);
226 out:
227 kfree(msg.data);
228 return rv;
229}
230
231static int ipmi_ioctl(struct file *file,
232 unsigned int cmd,
233 unsigned long data)
234{
235 int rv = -EINVAL;
236 struct ipmi_file_private *priv = file->private_data;
237 void __user *arg = (void __user *)data;
238
239 switch (cmd)
240 {
241 case IPMICTL_SEND_COMMAND:
242 {
243 struct ipmi_req req;
244
245 if (copy_from_user(&req, arg, sizeof(req))) {
246 rv = -EFAULT;
247 break;
248 }
249
250 rv = handle_send_req(priv->user,
251 &req,
252 priv->default_retries,
253 priv->default_retry_time_ms);
254 break;
255 }
256
257 case IPMICTL_SEND_COMMAND_SETTIME:
258 {
259 struct ipmi_req_settime req;
260
261 if (copy_from_user(&req, arg, sizeof(req))) {
262 rv = -EFAULT;
263 break;
264 }
265
266 rv = handle_send_req(priv->user,
267 &req.req,
268 req.retries,
269 req.retry_time_ms);
270 break;
271 }
272
273 case IPMICTL_RECEIVE_MSG:
274 case IPMICTL_RECEIVE_MSG_TRUNC:
275 {
276 struct ipmi_recv rsp;
277 int addr_len;
278 struct list_head *entry;
279 struct ipmi_recv_msg *msg;
280 unsigned long flags;
281
282
283 rv = 0;
284 if (copy_from_user(&rsp, arg, sizeof(rsp))) {
285 rv = -EFAULT;
286 break;
287 }
288
289 /* We claim a mutex because we don't want two
290 users getting something from the queue at a time.
291 Since we have to release the spinlock before we can
292 copy the data to the user, it's possible another
293 user will grab something from the queue, too. Then
294 the messages might get out of order if something
295 fails and the message gets put back onto the
296 queue. This mutex prevents that problem. */
297 mutex_lock(&priv->recv_mutex);
298
299 /* Grab the message off the list. */
300 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
301 if (list_empty(&(priv->recv_msgs))) {
302 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
303 rv = -EAGAIN;
304 goto recv_err;
305 }
306 entry = priv->recv_msgs.next;
307 msg = list_entry(entry, struct ipmi_recv_msg, link);
308 list_del(entry);
309 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
310
311 addr_len = ipmi_addr_length(msg->addr.addr_type);
312 if (rsp.addr_len < addr_len)
313 {
314 rv = -EINVAL;
315 goto recv_putback_on_err;
316 }
317
318 if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) {
319 rv = -EFAULT;
320 goto recv_putback_on_err;
321 }
322 rsp.addr_len = addr_len;
323
324 rsp.recv_type = msg->recv_type;
325 rsp.msgid = msg->msgid;
326 rsp.msg.netfn = msg->msg.netfn;
327 rsp.msg.cmd = msg->msg.cmd;
328
329 if (msg->msg.data_len > 0) {
330 if (rsp.msg.data_len < msg->msg.data_len) {
331 rv = -EMSGSIZE;
332 if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) {
333 msg->msg.data_len = rsp.msg.data_len;
334 } else {
335 goto recv_putback_on_err;
336 }
337 }
338
339 if (copy_to_user(rsp.msg.data,
340 msg->msg.data,
341 msg->msg.data_len))
342 {
343 rv = -EFAULT;
344 goto recv_putback_on_err;
345 }
346 rsp.msg.data_len = msg->msg.data_len;
347 } else {
348 rsp.msg.data_len = 0;
349 }
350
351 if (copy_to_user(arg, &rsp, sizeof(rsp))) {
352 rv = -EFAULT;
353 goto recv_putback_on_err;
354 }
355
356 mutex_unlock(&priv->recv_mutex);
357 ipmi_free_recv_msg(msg);
358 break;
359
360 recv_putback_on_err:
361 /* If we got an error, put the message back onto
362 the head of the queue. */
363 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
364 list_add(entry, &(priv->recv_msgs));
365 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
366 mutex_unlock(&priv->recv_mutex);
367 break;
368
369 recv_err:
370 mutex_unlock(&priv->recv_mutex);
371 break;
372 }
373
374 case IPMICTL_REGISTER_FOR_CMD:
375 {
376 struct ipmi_cmdspec val;
377
378 if (copy_from_user(&val, arg, sizeof(val))) {
379 rv = -EFAULT;
380 break;
381 }
382
383 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
384 IPMI_CHAN_ALL);
385 break;
386 }
387
388 case IPMICTL_UNREGISTER_FOR_CMD:
389 {
390 struct ipmi_cmdspec val;
391
392 if (copy_from_user(&val, arg, sizeof(val))) {
393 rv = -EFAULT;
394 break;
395 }
396
397 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
398 IPMI_CHAN_ALL);
399 break;
400 }
401
402 case IPMICTL_REGISTER_FOR_CMD_CHANS:
403 {
404 struct ipmi_cmdspec_chans val;
405
406 if (copy_from_user(&val, arg, sizeof(val))) {
407 rv = -EFAULT;
408 break;
409 }
410
411 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
412 val.chans);
413 break;
414 }
415
416 case IPMICTL_UNREGISTER_FOR_CMD_CHANS:
417 {
418 struct ipmi_cmdspec_chans val;
419
420 if (copy_from_user(&val, arg, sizeof(val))) {
421 rv = -EFAULT;
422 break;
423 }
424
425 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
426 val.chans);
427 break;
428 }
429
430 case IPMICTL_SET_GETS_EVENTS_CMD:
431 {
432 int val;
433
434 if (copy_from_user(&val, arg, sizeof(val))) {
435 rv = -EFAULT;
436 break;
437 }
438
439 rv = ipmi_set_gets_events(priv->user, val);
440 break;
441 }
442
443 /* The next four are legacy, not per-channel. */
444 case IPMICTL_SET_MY_ADDRESS_CMD:
445 {
446 unsigned int val;
447
448 if (copy_from_user(&val, arg, sizeof(val))) {
449 rv = -EFAULT;
450 break;
451 }
452
453 rv = ipmi_set_my_address(priv->user, 0, val);
454 break;
455 }
456
457 case IPMICTL_GET_MY_ADDRESS_CMD:
458 {
459 unsigned int val;
460 unsigned char rval;
461
462 rv = ipmi_get_my_address(priv->user, 0, &rval);
463 if (rv)
464 break;
465
466 val = rval;
467
468 if (copy_to_user(arg, &val, sizeof(val))) {
469 rv = -EFAULT;
470 break;
471 }
472 break;
473 }
474
475 case IPMICTL_SET_MY_LUN_CMD:
476 {
477 unsigned int val;
478
479 if (copy_from_user(&val, arg, sizeof(val))) {
480 rv = -EFAULT;
481 break;
482 }
483
484 rv = ipmi_set_my_LUN(priv->user, 0, val);
485 break;
486 }
487
488 case IPMICTL_GET_MY_LUN_CMD:
489 {
490 unsigned int val;
491 unsigned char rval;
492
493 rv = ipmi_get_my_LUN(priv->user, 0, &rval);
494 if (rv)
495 break;
496
497 val = rval;
498
499 if (copy_to_user(arg, &val, sizeof(val))) {
500 rv = -EFAULT;
501 break;
502 }
503 break;
504 }
505
506 case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
507 {
508 struct ipmi_channel_lun_address_set val;
509
510 if (copy_from_user(&val, arg, sizeof(val))) {
511 rv = -EFAULT;
512 break;
513 }
514
515 return ipmi_set_my_address(priv->user, val.channel, val.value);
516 break;
517 }
518
519 case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
520 {
521 struct ipmi_channel_lun_address_set val;
522
523 if (copy_from_user(&val, arg, sizeof(val))) {
524 rv = -EFAULT;
525 break;
526 }
527
528 rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
529 if (rv)
530 break;
531
532 if (copy_to_user(arg, &val, sizeof(val))) {
533 rv = -EFAULT;
534 break;
535 }
536 break;
537 }
538
539 case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
540 {
541 struct ipmi_channel_lun_address_set val;
542
543 if (copy_from_user(&val, arg, sizeof(val))) {
544 rv = -EFAULT;
545 break;
546 }
547
548 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
549 break;
550 }
551
552 case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
553 {
554 struct ipmi_channel_lun_address_set val;
555
556 if (copy_from_user(&val, arg, sizeof(val))) {
557 rv = -EFAULT;
558 break;
559 }
560
561 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
562 if (rv)
563 break;
564
565 if (copy_to_user(arg, &val, sizeof(val))) {
566 rv = -EFAULT;
567 break;
568 }
569 break;
570 }
571
572 case IPMICTL_SET_TIMING_PARMS_CMD:
573 {
574 struct ipmi_timing_parms parms;
575
576 if (copy_from_user(&parms, arg, sizeof(parms))) {
577 rv = -EFAULT;
578 break;
579 }
580
581 priv->default_retries = parms.retries;
582 priv->default_retry_time_ms = parms.retry_time_ms;
583 rv = 0;
584 break;
585 }
586
587 case IPMICTL_GET_TIMING_PARMS_CMD:
588 {
589 struct ipmi_timing_parms parms;
590
591 parms.retries = priv->default_retries;
592 parms.retry_time_ms = priv->default_retry_time_ms;
593
594 if (copy_to_user(arg, &parms, sizeof(parms))) {
595 rv = -EFAULT;
596 break;
597 }
598
599 rv = 0;
600 break;
601 }
602
603 case IPMICTL_GET_MAINTENANCE_MODE_CMD:
604 {
605 int mode;
606
607 mode = ipmi_get_maintenance_mode(priv->user);
608 if (copy_to_user(arg, &mode, sizeof(mode))) {
609 rv = -EFAULT;
610 break;
611 }
612 rv = 0;
613 break;
614 }
615
616 case IPMICTL_SET_MAINTENANCE_MODE_CMD:
617 {
618 int mode;
619
620 if (copy_from_user(&mode, arg, sizeof(mode))) {
621 rv = -EFAULT;
622 break;
623 }
624 rv = ipmi_set_maintenance_mode(priv->user, mode);
625 break;
626 }
627 }
628
629 return rv;
630}
631
632/*
633 * Note: it doesn't make sense to take the BKL here but
634 * not in compat_ipmi_ioctl. -arnd
635 */
636static long ipmi_unlocked_ioctl(struct file *file,
637 unsigned int cmd,
638 unsigned long data)
639{
640 int ret;
641
642 mutex_lock(&ipmi_mutex);
643 ret = ipmi_ioctl(file, cmd, data);
644 mutex_unlock(&ipmi_mutex);
645
646 return ret;
647}
648
649#ifdef CONFIG_COMPAT
650
651/*
652 * The following code contains code for supporting 32-bit compatible
653 * ioctls on 64-bit kernels. This allows running 32-bit apps on the
654 * 64-bit kernel
655 */
656#define COMPAT_IPMICTL_SEND_COMMAND \
657 _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req)
658#define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \
659 _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime)
660#define COMPAT_IPMICTL_RECEIVE_MSG \
661 _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv)
662#define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \
663 _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv)
664
665struct compat_ipmi_msg {
666 u8 netfn;
667 u8 cmd;
668 u16 data_len;
669 compat_uptr_t data;
670};
671
672struct compat_ipmi_req {
673 compat_uptr_t addr;
674 compat_uint_t addr_len;
675 compat_long_t msgid;
676 struct compat_ipmi_msg msg;
677};
678
679struct compat_ipmi_recv {
680 compat_int_t recv_type;
681 compat_uptr_t addr;
682 compat_uint_t addr_len;
683 compat_long_t msgid;
684 struct compat_ipmi_msg msg;
685};
686
687struct compat_ipmi_req_settime {
688 struct compat_ipmi_req req;
689 compat_int_t retries;
690 compat_uint_t retry_time_ms;
691};
692
693/*
694 * Define some helper functions for copying IPMI data
695 */
696static long get_compat_ipmi_msg(struct ipmi_msg *p64,
697 struct compat_ipmi_msg __user *p32)
698{
699 compat_uptr_t tmp;
700
701 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
702 __get_user(p64->netfn, &p32->netfn) ||
703 __get_user(p64->cmd, &p32->cmd) ||
704 __get_user(p64->data_len, &p32->data_len) ||
705 __get_user(tmp, &p32->data))
706 return -EFAULT;
707 p64->data = compat_ptr(tmp);
708 return 0;
709}
710
711static long put_compat_ipmi_msg(struct ipmi_msg *p64,
712 struct compat_ipmi_msg __user *p32)
713{
714 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
715 __put_user(p64->netfn, &p32->netfn) ||
716 __put_user(p64->cmd, &p32->cmd) ||
717 __put_user(p64->data_len, &p32->data_len))
718 return -EFAULT;
719 return 0;
720}
721
722static long get_compat_ipmi_req(struct ipmi_req *p64,
723 struct compat_ipmi_req __user *p32)
724{
725
726 compat_uptr_t tmp;
727
728 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
729 __get_user(tmp, &p32->addr) ||
730 __get_user(p64->addr_len, &p32->addr_len) ||
731 __get_user(p64->msgid, &p32->msgid) ||
732 get_compat_ipmi_msg(&p64->msg, &p32->msg))
733 return -EFAULT;
734 p64->addr = compat_ptr(tmp);
735 return 0;
736}
737
738static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64,
739 struct compat_ipmi_req_settime __user *p32)
740{
741 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
742 get_compat_ipmi_req(&p64->req, &p32->req) ||
743 __get_user(p64->retries, &p32->retries) ||
744 __get_user(p64->retry_time_ms, &p32->retry_time_ms))
745 return -EFAULT;
746 return 0;
747}
748
749static long get_compat_ipmi_recv(struct ipmi_recv *p64,
750 struct compat_ipmi_recv __user *p32)
751{
752 compat_uptr_t tmp;
753
754 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
755 __get_user(p64->recv_type, &p32->recv_type) ||
756 __get_user(tmp, &p32->addr) ||
757 __get_user(p64->addr_len, &p32->addr_len) ||
758 __get_user(p64->msgid, &p32->msgid) ||
759 get_compat_ipmi_msg(&p64->msg, &p32->msg))
760 return -EFAULT;
761 p64->addr = compat_ptr(tmp);
762 return 0;
763}
764
765static long put_compat_ipmi_recv(struct ipmi_recv *p64,
766 struct compat_ipmi_recv __user *p32)
767{
768 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
769 __put_user(p64->recv_type, &p32->recv_type) ||
770 __put_user(p64->addr_len, &p32->addr_len) ||
771 __put_user(p64->msgid, &p32->msgid) ||
772 put_compat_ipmi_msg(&p64->msg, &p32->msg))
773 return -EFAULT;
774 return 0;
775}
776
777/*
778 * Handle compatibility ioctls
779 */
780static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
781 unsigned long arg)
782{
783 int rc;
784 struct ipmi_file_private *priv = filep->private_data;
785
786 switch(cmd) {
787 case COMPAT_IPMICTL_SEND_COMMAND:
788 {
789 struct ipmi_req rp;
790
791 if (get_compat_ipmi_req(&rp, compat_ptr(arg)))
792 return -EFAULT;
793
794 return handle_send_req(priv->user, &rp,
795 priv->default_retries,
796 priv->default_retry_time_ms);
797 }
798 case COMPAT_IPMICTL_SEND_COMMAND_SETTIME:
799 {
800 struct ipmi_req_settime sp;
801
802 if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg)))
803 return -EFAULT;
804
805 return handle_send_req(priv->user, &sp.req,
806 sp.retries, sp.retry_time_ms);
807 }
808 case COMPAT_IPMICTL_RECEIVE_MSG:
809 case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC:
810 {
811 struct ipmi_recv __user *precv64;
812 struct ipmi_recv recv64;
813
814 if (get_compat_ipmi_recv(&recv64, compat_ptr(arg)))
815 return -EFAULT;
816
817 precv64 = compat_alloc_user_space(sizeof(recv64));
818 if (copy_to_user(precv64, &recv64, sizeof(recv64)))
819 return -EFAULT;
820
821 rc = ipmi_ioctl(filep,
822 ((cmd == COMPAT_IPMICTL_RECEIVE_MSG)
823 ? IPMICTL_RECEIVE_MSG
824 : IPMICTL_RECEIVE_MSG_TRUNC),
825 (unsigned long) precv64);
826 if (rc != 0)
827 return rc;
828
829 if (copy_from_user(&recv64, precv64, sizeof(recv64)))
830 return -EFAULT;
831
832 if (put_compat_ipmi_recv(&recv64, compat_ptr(arg)))
833 return -EFAULT;
834
835 return rc;
836 }
837 default:
838 return ipmi_ioctl(filep, cmd, arg);
839 }
840}
841#endif
842
843static const struct file_operations ipmi_fops = {
844 .owner = THIS_MODULE,
845 .unlocked_ioctl = ipmi_unlocked_ioctl,
846#ifdef CONFIG_COMPAT
847 .compat_ioctl = compat_ipmi_ioctl,
848#endif
849 .open = ipmi_open,
850 .release = ipmi_release,
851 .fasync = ipmi_fasync,
852 .poll = ipmi_poll,
853 .llseek = noop_llseek,
854};
855
856#define DEVICE_NAME "ipmidev"
857
858static int ipmi_major;
859module_param(ipmi_major, int, 0);
860MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By"
861 " default, or if you set it to zero, it will choose the next"
862 " available device. Setting it to -1 will disable the"
863 " interface. Other values will set the major device number"
864 " to that value.");
865
866/* Keep track of the devices that are registered. */
867struct ipmi_reg_list {
868 dev_t dev;
869 struct list_head link;
870};
871static LIST_HEAD(reg_list);
872static DEFINE_MUTEX(reg_list_mutex);
873
874static struct class *ipmi_class;
875
876static void ipmi_new_smi(int if_num, struct device *device)
877{
878 dev_t dev = MKDEV(ipmi_major, if_num);
879 struct ipmi_reg_list *entry;
880
881 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
882 if (!entry) {
883 printk(KERN_ERR "ipmi_devintf: Unable to create the"
884 " ipmi class device link\n");
885 return;
886 }
887 entry->dev = dev;
888
889 mutex_lock(®_list_mutex);
890 device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
891 list_add(&entry->link, ®_list);
892 mutex_unlock(®_list_mutex);
893}
894
895static void ipmi_smi_gone(int if_num)
896{
897 dev_t dev = MKDEV(ipmi_major, if_num);
898 struct ipmi_reg_list *entry;
899
900 mutex_lock(®_list_mutex);
901 list_for_each_entry(entry, ®_list, link) {
902 if (entry->dev == dev) {
903 list_del(&entry->link);
904 kfree(entry);
905 break;
906 }
907 }
908 device_destroy(ipmi_class, dev);
909 mutex_unlock(®_list_mutex);
910}
911
912static struct ipmi_smi_watcher smi_watcher =
913{
914 .owner = THIS_MODULE,
915 .new_smi = ipmi_new_smi,
916 .smi_gone = ipmi_smi_gone,
917};
918
919static int __init init_ipmi_devintf(void)
920{
921 int rv;
922
923 if (ipmi_major < 0)
924 return -EINVAL;
925
926 printk(KERN_INFO "ipmi device interface\n");
927
928 ipmi_class = class_create(THIS_MODULE, "ipmi");
929 if (IS_ERR(ipmi_class)) {
930 printk(KERN_ERR "ipmi: can't register device class\n");
931 return PTR_ERR(ipmi_class);
932 }
933
934 rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
935 if (rv < 0) {
936 class_destroy(ipmi_class);
937 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
938 return rv;
939 }
940
941 if (ipmi_major == 0) {
942 ipmi_major = rv;
943 }
944
945 rv = ipmi_smi_watcher_register(&smi_watcher);
946 if (rv) {
947 unregister_chrdev(ipmi_major, DEVICE_NAME);
948 class_destroy(ipmi_class);
949 printk(KERN_WARNING "ipmi: can't register smi watcher\n");
950 return rv;
951 }
952
953 return 0;
954}
955module_init(init_ipmi_devintf);
956
957static void __exit cleanup_ipmi(void)
958{
959 struct ipmi_reg_list *entry, *entry2;
960 mutex_lock(®_list_mutex);
961 list_for_each_entry_safe(entry, entry2, ®_list, link) {
962 list_del(&entry->link);
963 device_destroy(ipmi_class, entry->dev);
964 kfree(entry);
965 }
966 mutex_unlock(®_list_mutex);
967 class_destroy(ipmi_class);
968 ipmi_smi_watcher_unregister(&smi_watcher);
969 unregister_chrdev(ipmi_major, DEVICE_NAME);
970}
971module_exit(cleanup_ipmi);
972
973MODULE_LICENSE("GPL");
974MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
975MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
976MODULE_ALIAS("platform:ipmi_si");
1/*
2 * ipmi_devintf.c
3 *
4 * Linux device interface for the IPMI message handler.
5 *
6 * Author: MontaVista Software, Inc.
7 * Corey Minyard <minyard@mvista.com>
8 * source@mvista.com
9 *
10 * Copyright 2002 MontaVista Software Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
27 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 */
33
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/errno.h>
37#include <linux/poll.h>
38#include <linux/sched.h>
39#include <linux/spinlock.h>
40#include <linux/slab.h>
41#include <linux/ipmi.h>
42#include <linux/mutex.h>
43#include <linux/init.h>
44#include <linux/device.h>
45#include <linux/compat.h>
46
47struct ipmi_file_private
48{
49 ipmi_user_t user;
50 spinlock_t recv_msg_lock;
51 struct list_head recv_msgs;
52 struct file *file;
53 struct fasync_struct *fasync_queue;
54 wait_queue_head_t wait;
55 struct mutex recv_mutex;
56 int default_retries;
57 unsigned int default_retry_time_ms;
58};
59
60static DEFINE_MUTEX(ipmi_mutex);
61static void file_receive_handler(struct ipmi_recv_msg *msg,
62 void *handler_data)
63{
64 struct ipmi_file_private *priv = handler_data;
65 int was_empty;
66 unsigned long flags;
67
68 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
69
70 was_empty = list_empty(&(priv->recv_msgs));
71 list_add_tail(&(msg->link), &(priv->recv_msgs));
72
73 if (was_empty) {
74 wake_up_interruptible(&priv->wait);
75 kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
76 }
77
78 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
79}
80
81static unsigned int ipmi_poll(struct file *file, poll_table *wait)
82{
83 struct ipmi_file_private *priv = file->private_data;
84 unsigned int mask = 0;
85 unsigned long flags;
86
87 poll_wait(file, &priv->wait, wait);
88
89 spin_lock_irqsave(&priv->recv_msg_lock, flags);
90
91 if (!list_empty(&(priv->recv_msgs)))
92 mask |= (POLLIN | POLLRDNORM);
93
94 spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
95
96 return mask;
97}
98
99static int ipmi_fasync(int fd, struct file *file, int on)
100{
101 struct ipmi_file_private *priv = file->private_data;
102 int result;
103
104 mutex_lock(&ipmi_mutex); /* could race against open() otherwise */
105 result = fasync_helper(fd, file, on, &priv->fasync_queue);
106 mutex_unlock(&ipmi_mutex);
107
108 return (result);
109}
110
111static struct ipmi_user_hndl ipmi_hndlrs =
112{
113 .ipmi_recv_hndl = file_receive_handler,
114};
115
116static int ipmi_open(struct inode *inode, struct file *file)
117{
118 int if_num = iminor(inode);
119 int rv;
120 struct ipmi_file_private *priv;
121
122
123 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
124 if (!priv)
125 return -ENOMEM;
126
127 mutex_lock(&ipmi_mutex);
128 priv->file = file;
129
130 rv = ipmi_create_user(if_num,
131 &ipmi_hndlrs,
132 priv,
133 &(priv->user));
134 if (rv) {
135 kfree(priv);
136 goto out;
137 }
138
139 file->private_data = priv;
140
141 spin_lock_init(&(priv->recv_msg_lock));
142 INIT_LIST_HEAD(&(priv->recv_msgs));
143 init_waitqueue_head(&priv->wait);
144 priv->fasync_queue = NULL;
145 mutex_init(&priv->recv_mutex);
146
147 /* Use the low-level defaults. */
148 priv->default_retries = -1;
149 priv->default_retry_time_ms = 0;
150
151out:
152 mutex_unlock(&ipmi_mutex);
153 return rv;
154}
155
156static int ipmi_release(struct inode *inode, struct file *file)
157{
158 struct ipmi_file_private *priv = file->private_data;
159 int rv;
160 struct ipmi_recv_msg *msg, *next;
161
162 rv = ipmi_destroy_user(priv->user);
163 if (rv)
164 return rv;
165
166 list_for_each_entry_safe(msg, next, &priv->recv_msgs, link)
167 ipmi_free_recv_msg(msg);
168
169
170 kfree(priv);
171
172 return 0;
173}
174
175static int handle_send_req(ipmi_user_t user,
176 struct ipmi_req *req,
177 int retries,
178 unsigned int retry_time_ms)
179{
180 int rv;
181 struct ipmi_addr addr;
182 struct kernel_ipmi_msg msg;
183
184 if (req->addr_len > sizeof(struct ipmi_addr))
185 return -EINVAL;
186
187 if (copy_from_user(&addr, req->addr, req->addr_len))
188 return -EFAULT;
189
190 msg.netfn = req->msg.netfn;
191 msg.cmd = req->msg.cmd;
192 msg.data_len = req->msg.data_len;
193 msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
194 if (!msg.data)
195 return -ENOMEM;
196
197 /* From here out we cannot return, we must jump to "out" for
198 error exits to free msgdata. */
199
200 rv = ipmi_validate_addr(&addr, req->addr_len);
201 if (rv)
202 goto out;
203
204 if (req->msg.data != NULL) {
205 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
206 rv = -EMSGSIZE;
207 goto out;
208 }
209
210 if (copy_from_user(msg.data,
211 req->msg.data,
212 req->msg.data_len))
213 {
214 rv = -EFAULT;
215 goto out;
216 }
217 } else {
218 msg.data_len = 0;
219 }
220
221 rv = ipmi_request_settime(user,
222 &addr,
223 req->msgid,
224 &msg,
225 NULL,
226 0,
227 retries,
228 retry_time_ms);
229 out:
230 kfree(msg.data);
231 return rv;
232}
233
234static int ipmi_ioctl(struct file *file,
235 unsigned int cmd,
236 unsigned long data)
237{
238 int rv = -EINVAL;
239 struct ipmi_file_private *priv = file->private_data;
240 void __user *arg = (void __user *)data;
241
242 switch (cmd)
243 {
244 case IPMICTL_SEND_COMMAND:
245 {
246 struct ipmi_req req;
247
248 if (copy_from_user(&req, arg, sizeof(req))) {
249 rv = -EFAULT;
250 break;
251 }
252
253 rv = handle_send_req(priv->user,
254 &req,
255 priv->default_retries,
256 priv->default_retry_time_ms);
257 break;
258 }
259
260 case IPMICTL_SEND_COMMAND_SETTIME:
261 {
262 struct ipmi_req_settime req;
263
264 if (copy_from_user(&req, arg, sizeof(req))) {
265 rv = -EFAULT;
266 break;
267 }
268
269 rv = handle_send_req(priv->user,
270 &req.req,
271 req.retries,
272 req.retry_time_ms);
273 break;
274 }
275
276 case IPMICTL_RECEIVE_MSG:
277 case IPMICTL_RECEIVE_MSG_TRUNC:
278 {
279 struct ipmi_recv rsp;
280 int addr_len;
281 struct list_head *entry;
282 struct ipmi_recv_msg *msg;
283 unsigned long flags;
284
285
286 rv = 0;
287 if (copy_from_user(&rsp, arg, sizeof(rsp))) {
288 rv = -EFAULT;
289 break;
290 }
291
292 /* We claim a mutex because we don't want two
293 users getting something from the queue at a time.
294 Since we have to release the spinlock before we can
295 copy the data to the user, it's possible another
296 user will grab something from the queue, too. Then
297 the messages might get out of order if something
298 fails and the message gets put back onto the
299 queue. This mutex prevents that problem. */
300 mutex_lock(&priv->recv_mutex);
301
302 /* Grab the message off the list. */
303 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
304 if (list_empty(&(priv->recv_msgs))) {
305 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
306 rv = -EAGAIN;
307 goto recv_err;
308 }
309 entry = priv->recv_msgs.next;
310 msg = list_entry(entry, struct ipmi_recv_msg, link);
311 list_del(entry);
312 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
313
314 addr_len = ipmi_addr_length(msg->addr.addr_type);
315 if (rsp.addr_len < addr_len)
316 {
317 rv = -EINVAL;
318 goto recv_putback_on_err;
319 }
320
321 if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) {
322 rv = -EFAULT;
323 goto recv_putback_on_err;
324 }
325 rsp.addr_len = addr_len;
326
327 rsp.recv_type = msg->recv_type;
328 rsp.msgid = msg->msgid;
329 rsp.msg.netfn = msg->msg.netfn;
330 rsp.msg.cmd = msg->msg.cmd;
331
332 if (msg->msg.data_len > 0) {
333 if (rsp.msg.data_len < msg->msg.data_len) {
334 rv = -EMSGSIZE;
335 if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) {
336 msg->msg.data_len = rsp.msg.data_len;
337 } else {
338 goto recv_putback_on_err;
339 }
340 }
341
342 if (copy_to_user(rsp.msg.data,
343 msg->msg.data,
344 msg->msg.data_len))
345 {
346 rv = -EFAULT;
347 goto recv_putback_on_err;
348 }
349 rsp.msg.data_len = msg->msg.data_len;
350 } else {
351 rsp.msg.data_len = 0;
352 }
353
354 if (copy_to_user(arg, &rsp, sizeof(rsp))) {
355 rv = -EFAULT;
356 goto recv_putback_on_err;
357 }
358
359 mutex_unlock(&priv->recv_mutex);
360 ipmi_free_recv_msg(msg);
361 break;
362
363 recv_putback_on_err:
364 /* If we got an error, put the message back onto
365 the head of the queue. */
366 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
367 list_add(entry, &(priv->recv_msgs));
368 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
369 mutex_unlock(&priv->recv_mutex);
370 break;
371
372 recv_err:
373 mutex_unlock(&priv->recv_mutex);
374 break;
375 }
376
377 case IPMICTL_REGISTER_FOR_CMD:
378 {
379 struct ipmi_cmdspec val;
380
381 if (copy_from_user(&val, arg, sizeof(val))) {
382 rv = -EFAULT;
383 break;
384 }
385
386 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
387 IPMI_CHAN_ALL);
388 break;
389 }
390
391 case IPMICTL_UNREGISTER_FOR_CMD:
392 {
393 struct ipmi_cmdspec val;
394
395 if (copy_from_user(&val, arg, sizeof(val))) {
396 rv = -EFAULT;
397 break;
398 }
399
400 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
401 IPMI_CHAN_ALL);
402 break;
403 }
404
405 case IPMICTL_REGISTER_FOR_CMD_CHANS:
406 {
407 struct ipmi_cmdspec_chans val;
408
409 if (copy_from_user(&val, arg, sizeof(val))) {
410 rv = -EFAULT;
411 break;
412 }
413
414 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
415 val.chans);
416 break;
417 }
418
419 case IPMICTL_UNREGISTER_FOR_CMD_CHANS:
420 {
421 struct ipmi_cmdspec_chans val;
422
423 if (copy_from_user(&val, arg, sizeof(val))) {
424 rv = -EFAULT;
425 break;
426 }
427
428 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
429 val.chans);
430 break;
431 }
432
433 case IPMICTL_SET_GETS_EVENTS_CMD:
434 {
435 int val;
436
437 if (copy_from_user(&val, arg, sizeof(val))) {
438 rv = -EFAULT;
439 break;
440 }
441
442 rv = ipmi_set_gets_events(priv->user, val);
443 break;
444 }
445
446 /* The next four are legacy, not per-channel. */
447 case IPMICTL_SET_MY_ADDRESS_CMD:
448 {
449 unsigned int val;
450
451 if (copy_from_user(&val, arg, sizeof(val))) {
452 rv = -EFAULT;
453 break;
454 }
455
456 rv = ipmi_set_my_address(priv->user, 0, val);
457 break;
458 }
459
460 case IPMICTL_GET_MY_ADDRESS_CMD:
461 {
462 unsigned int val;
463 unsigned char rval;
464
465 rv = ipmi_get_my_address(priv->user, 0, &rval);
466 if (rv)
467 break;
468
469 val = rval;
470
471 if (copy_to_user(arg, &val, sizeof(val))) {
472 rv = -EFAULT;
473 break;
474 }
475 break;
476 }
477
478 case IPMICTL_SET_MY_LUN_CMD:
479 {
480 unsigned int val;
481
482 if (copy_from_user(&val, arg, sizeof(val))) {
483 rv = -EFAULT;
484 break;
485 }
486
487 rv = ipmi_set_my_LUN(priv->user, 0, val);
488 break;
489 }
490
491 case IPMICTL_GET_MY_LUN_CMD:
492 {
493 unsigned int val;
494 unsigned char rval;
495
496 rv = ipmi_get_my_LUN(priv->user, 0, &rval);
497 if (rv)
498 break;
499
500 val = rval;
501
502 if (copy_to_user(arg, &val, sizeof(val))) {
503 rv = -EFAULT;
504 break;
505 }
506 break;
507 }
508
509 case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
510 {
511 struct ipmi_channel_lun_address_set val;
512
513 if (copy_from_user(&val, arg, sizeof(val))) {
514 rv = -EFAULT;
515 break;
516 }
517
518 return ipmi_set_my_address(priv->user, val.channel, val.value);
519 break;
520 }
521
522 case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
523 {
524 struct ipmi_channel_lun_address_set val;
525
526 if (copy_from_user(&val, arg, sizeof(val))) {
527 rv = -EFAULT;
528 break;
529 }
530
531 rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
532 if (rv)
533 break;
534
535 if (copy_to_user(arg, &val, sizeof(val))) {
536 rv = -EFAULT;
537 break;
538 }
539 break;
540 }
541
542 case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
543 {
544 struct ipmi_channel_lun_address_set val;
545
546 if (copy_from_user(&val, arg, sizeof(val))) {
547 rv = -EFAULT;
548 break;
549 }
550
551 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
552 break;
553 }
554
555 case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
556 {
557 struct ipmi_channel_lun_address_set val;
558
559 if (copy_from_user(&val, arg, sizeof(val))) {
560 rv = -EFAULT;
561 break;
562 }
563
564 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
565 if (rv)
566 break;
567
568 if (copy_to_user(arg, &val, sizeof(val))) {
569 rv = -EFAULT;
570 break;
571 }
572 break;
573 }
574
575 case IPMICTL_SET_TIMING_PARMS_CMD:
576 {
577 struct ipmi_timing_parms parms;
578
579 if (copy_from_user(&parms, arg, sizeof(parms))) {
580 rv = -EFAULT;
581 break;
582 }
583
584 priv->default_retries = parms.retries;
585 priv->default_retry_time_ms = parms.retry_time_ms;
586 rv = 0;
587 break;
588 }
589
590 case IPMICTL_GET_TIMING_PARMS_CMD:
591 {
592 struct ipmi_timing_parms parms;
593
594 parms.retries = priv->default_retries;
595 parms.retry_time_ms = priv->default_retry_time_ms;
596
597 if (copy_to_user(arg, &parms, sizeof(parms))) {
598 rv = -EFAULT;
599 break;
600 }
601
602 rv = 0;
603 break;
604 }
605
606 case IPMICTL_GET_MAINTENANCE_MODE_CMD:
607 {
608 int mode;
609
610 mode = ipmi_get_maintenance_mode(priv->user);
611 if (copy_to_user(arg, &mode, sizeof(mode))) {
612 rv = -EFAULT;
613 break;
614 }
615 rv = 0;
616 break;
617 }
618
619 case IPMICTL_SET_MAINTENANCE_MODE_CMD:
620 {
621 int mode;
622
623 if (copy_from_user(&mode, arg, sizeof(mode))) {
624 rv = -EFAULT;
625 break;
626 }
627 rv = ipmi_set_maintenance_mode(priv->user, mode);
628 break;
629 }
630 }
631
632 return rv;
633}
634
635/*
636 * Note: it doesn't make sense to take the BKL here but
637 * not in compat_ipmi_ioctl. -arnd
638 */
639static long ipmi_unlocked_ioctl(struct file *file,
640 unsigned int cmd,
641 unsigned long data)
642{
643 int ret;
644
645 mutex_lock(&ipmi_mutex);
646 ret = ipmi_ioctl(file, cmd, data);
647 mutex_unlock(&ipmi_mutex);
648
649 return ret;
650}
651
652#ifdef CONFIG_COMPAT
653
654/*
655 * The following code contains code for supporting 32-bit compatible
656 * ioctls on 64-bit kernels. This allows running 32-bit apps on the
657 * 64-bit kernel
658 */
659#define COMPAT_IPMICTL_SEND_COMMAND \
660 _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req)
661#define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \
662 _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime)
663#define COMPAT_IPMICTL_RECEIVE_MSG \
664 _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv)
665#define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \
666 _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv)
667
668struct compat_ipmi_msg {
669 u8 netfn;
670 u8 cmd;
671 u16 data_len;
672 compat_uptr_t data;
673};
674
675struct compat_ipmi_req {
676 compat_uptr_t addr;
677 compat_uint_t addr_len;
678 compat_long_t msgid;
679 struct compat_ipmi_msg msg;
680};
681
682struct compat_ipmi_recv {
683 compat_int_t recv_type;
684 compat_uptr_t addr;
685 compat_uint_t addr_len;
686 compat_long_t msgid;
687 struct compat_ipmi_msg msg;
688};
689
690struct compat_ipmi_req_settime {
691 struct compat_ipmi_req req;
692 compat_int_t retries;
693 compat_uint_t retry_time_ms;
694};
695
696/*
697 * Define some helper functions for copying IPMI data
698 */
699static long get_compat_ipmi_msg(struct ipmi_msg *p64,
700 struct compat_ipmi_msg __user *p32)
701{
702 compat_uptr_t tmp;
703
704 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
705 __get_user(p64->netfn, &p32->netfn) ||
706 __get_user(p64->cmd, &p32->cmd) ||
707 __get_user(p64->data_len, &p32->data_len) ||
708 __get_user(tmp, &p32->data))
709 return -EFAULT;
710 p64->data = compat_ptr(tmp);
711 return 0;
712}
713
714static long put_compat_ipmi_msg(struct ipmi_msg *p64,
715 struct compat_ipmi_msg __user *p32)
716{
717 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
718 __put_user(p64->netfn, &p32->netfn) ||
719 __put_user(p64->cmd, &p32->cmd) ||
720 __put_user(p64->data_len, &p32->data_len))
721 return -EFAULT;
722 return 0;
723}
724
725static long get_compat_ipmi_req(struct ipmi_req *p64,
726 struct compat_ipmi_req __user *p32)
727{
728
729 compat_uptr_t tmp;
730
731 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
732 __get_user(tmp, &p32->addr) ||
733 __get_user(p64->addr_len, &p32->addr_len) ||
734 __get_user(p64->msgid, &p32->msgid) ||
735 get_compat_ipmi_msg(&p64->msg, &p32->msg))
736 return -EFAULT;
737 p64->addr = compat_ptr(tmp);
738 return 0;
739}
740
741static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64,
742 struct compat_ipmi_req_settime __user *p32)
743{
744 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
745 get_compat_ipmi_req(&p64->req, &p32->req) ||
746 __get_user(p64->retries, &p32->retries) ||
747 __get_user(p64->retry_time_ms, &p32->retry_time_ms))
748 return -EFAULT;
749 return 0;
750}
751
752static long get_compat_ipmi_recv(struct ipmi_recv *p64,
753 struct compat_ipmi_recv __user *p32)
754{
755 compat_uptr_t tmp;
756
757 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
758 __get_user(p64->recv_type, &p32->recv_type) ||
759 __get_user(tmp, &p32->addr) ||
760 __get_user(p64->addr_len, &p32->addr_len) ||
761 __get_user(p64->msgid, &p32->msgid) ||
762 get_compat_ipmi_msg(&p64->msg, &p32->msg))
763 return -EFAULT;
764 p64->addr = compat_ptr(tmp);
765 return 0;
766}
767
768static long put_compat_ipmi_recv(struct ipmi_recv *p64,
769 struct compat_ipmi_recv __user *p32)
770{
771 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
772 __put_user(p64->recv_type, &p32->recv_type) ||
773 __put_user(p64->addr_len, &p32->addr_len) ||
774 __put_user(p64->msgid, &p32->msgid) ||
775 put_compat_ipmi_msg(&p64->msg, &p32->msg))
776 return -EFAULT;
777 return 0;
778}
779
780/*
781 * Handle compatibility ioctls
782 */
783static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
784 unsigned long arg)
785{
786 int rc;
787 struct ipmi_file_private *priv = filep->private_data;
788
789 switch(cmd) {
790 case COMPAT_IPMICTL_SEND_COMMAND:
791 {
792 struct ipmi_req rp;
793
794 if (get_compat_ipmi_req(&rp, compat_ptr(arg)))
795 return -EFAULT;
796
797 return handle_send_req(priv->user, &rp,
798 priv->default_retries,
799 priv->default_retry_time_ms);
800 }
801 case COMPAT_IPMICTL_SEND_COMMAND_SETTIME:
802 {
803 struct ipmi_req_settime sp;
804
805 if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg)))
806 return -EFAULT;
807
808 return handle_send_req(priv->user, &sp.req,
809 sp.retries, sp.retry_time_ms);
810 }
811 case COMPAT_IPMICTL_RECEIVE_MSG:
812 case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC:
813 {
814 struct ipmi_recv __user *precv64;
815 struct ipmi_recv recv64;
816
817 memset(&recv64, 0, sizeof(recv64));
818 if (get_compat_ipmi_recv(&recv64, compat_ptr(arg)))
819 return -EFAULT;
820
821 precv64 = compat_alloc_user_space(sizeof(recv64));
822 if (copy_to_user(precv64, &recv64, sizeof(recv64)))
823 return -EFAULT;
824
825 rc = ipmi_ioctl(filep,
826 ((cmd == COMPAT_IPMICTL_RECEIVE_MSG)
827 ? IPMICTL_RECEIVE_MSG
828 : IPMICTL_RECEIVE_MSG_TRUNC),
829 (unsigned long) precv64);
830 if (rc != 0)
831 return rc;
832
833 if (copy_from_user(&recv64, precv64, sizeof(recv64)))
834 return -EFAULT;
835
836 if (put_compat_ipmi_recv(&recv64, compat_ptr(arg)))
837 return -EFAULT;
838
839 return rc;
840 }
841 default:
842 return ipmi_ioctl(filep, cmd, arg);
843 }
844}
845
846static long unlocked_compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
847 unsigned long arg)
848{
849 int ret;
850
851 mutex_lock(&ipmi_mutex);
852 ret = compat_ipmi_ioctl(filep, cmd, arg);
853 mutex_unlock(&ipmi_mutex);
854
855 return ret;
856}
857#endif
858
859static const struct file_operations ipmi_fops = {
860 .owner = THIS_MODULE,
861 .unlocked_ioctl = ipmi_unlocked_ioctl,
862#ifdef CONFIG_COMPAT
863 .compat_ioctl = unlocked_compat_ipmi_ioctl,
864#endif
865 .open = ipmi_open,
866 .release = ipmi_release,
867 .fasync = ipmi_fasync,
868 .poll = ipmi_poll,
869 .llseek = noop_llseek,
870};
871
872#define DEVICE_NAME "ipmidev"
873
874static int ipmi_major;
875module_param(ipmi_major, int, 0);
876MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By"
877 " default, or if you set it to zero, it will choose the next"
878 " available device. Setting it to -1 will disable the"
879 " interface. Other values will set the major device number"
880 " to that value.");
881
882/* Keep track of the devices that are registered. */
883struct ipmi_reg_list {
884 dev_t dev;
885 struct list_head link;
886};
887static LIST_HEAD(reg_list);
888static DEFINE_MUTEX(reg_list_mutex);
889
890static struct class *ipmi_class;
891
892static void ipmi_new_smi(int if_num, struct device *device)
893{
894 dev_t dev = MKDEV(ipmi_major, if_num);
895 struct ipmi_reg_list *entry;
896
897 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
898 if (!entry) {
899 printk(KERN_ERR "ipmi_devintf: Unable to create the"
900 " ipmi class device link\n");
901 return;
902 }
903 entry->dev = dev;
904
905 mutex_lock(®_list_mutex);
906 device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
907 list_add(&entry->link, ®_list);
908 mutex_unlock(®_list_mutex);
909}
910
911static void ipmi_smi_gone(int if_num)
912{
913 dev_t dev = MKDEV(ipmi_major, if_num);
914 struct ipmi_reg_list *entry;
915
916 mutex_lock(®_list_mutex);
917 list_for_each_entry(entry, ®_list, link) {
918 if (entry->dev == dev) {
919 list_del(&entry->link);
920 kfree(entry);
921 break;
922 }
923 }
924 device_destroy(ipmi_class, dev);
925 mutex_unlock(®_list_mutex);
926}
927
928static struct ipmi_smi_watcher smi_watcher =
929{
930 .owner = THIS_MODULE,
931 .new_smi = ipmi_new_smi,
932 .smi_gone = ipmi_smi_gone,
933};
934
935static int __init init_ipmi_devintf(void)
936{
937 int rv;
938
939 if (ipmi_major < 0)
940 return -EINVAL;
941
942 printk(KERN_INFO "ipmi device interface\n");
943
944 ipmi_class = class_create(THIS_MODULE, "ipmi");
945 if (IS_ERR(ipmi_class)) {
946 printk(KERN_ERR "ipmi: can't register device class\n");
947 return PTR_ERR(ipmi_class);
948 }
949
950 rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
951 if (rv < 0) {
952 class_destroy(ipmi_class);
953 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
954 return rv;
955 }
956
957 if (ipmi_major == 0) {
958 ipmi_major = rv;
959 }
960
961 rv = ipmi_smi_watcher_register(&smi_watcher);
962 if (rv) {
963 unregister_chrdev(ipmi_major, DEVICE_NAME);
964 class_destroy(ipmi_class);
965 printk(KERN_WARNING "ipmi: can't register smi watcher\n");
966 return rv;
967 }
968
969 return 0;
970}
971module_init(init_ipmi_devintf);
972
973static void __exit cleanup_ipmi(void)
974{
975 struct ipmi_reg_list *entry, *entry2;
976 mutex_lock(®_list_mutex);
977 list_for_each_entry_safe(entry, entry2, ®_list, link) {
978 list_del(&entry->link);
979 device_destroy(ipmi_class, entry->dev);
980 kfree(entry);
981 }
982 mutex_unlock(®_list_mutex);
983 class_destroy(ipmi_class);
984 ipmi_smi_watcher_unregister(&smi_watcher);
985 unregister_chrdev(ipmi_major, DEVICE_NAME);
986}
987module_exit(cleanup_ipmi);
988
989MODULE_LICENSE("GPL");
990MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
991MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
992MODULE_ALIAS("platform:ipmi_si");