Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/drivers/char/ipmi/ipmi_msghandler.c

  1 /*
  2  * ipmi_msghandler.c
  3  *
  4  * Incoming and outgoing message routing for an IPMI interface.
  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/errno.h>
 36 #include <linux/poll.h>
 37 #include <linux/sched.h>
 38 #include <linux/seq_file.h>
 39 #include <linux/spinlock.h>
 40 #include <linux/mutex.h>
 41 #include <linux/slab.h>
 42 #include <linux/ipmi.h>
 43 #include <linux/ipmi_smi.h>
 44 #include <linux/notifier.h>
 45 #include <linux/init.h>
 46 #include <linux/proc_fs.h>
 47 #include <linux/rcupdate.h>
 48 #include <linux/interrupt.h>
 49 
 50 #define PFX "IPMI message handler: "
 51 
 52 #define IPMI_DRIVER_VERSION "39.2"
 53 
 54 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
 55 static int ipmi_init_msghandler(void);
 56 static void smi_recv_tasklet(unsigned long);
 57 static void handle_new_recv_msgs(ipmi_smi_t intf);
 58 static void need_waiter(ipmi_smi_t intf);
 59 static int handle_one_recv_msg(ipmi_smi_t          intf,
 60                                struct ipmi_smi_msg *msg);
 61 
 62 static int initialized;
 63 
 64 #ifdef CONFIG_PROC_FS
 65 static struct proc_dir_entry *proc_ipmi_root;
 66 #endif /* CONFIG_PROC_FS */
 67 
 68 /* Remain in auto-maintenance mode for this amount of time (in ms). */
 69 #define IPMI_MAINTENANCE_MODE_TIMEOUT 30000
 70 
 71 #define MAX_EVENTS_IN_QUEUE     25
 72 
 73 /*
 74  * Don't let a message sit in a queue forever, always time it with at lest
 75  * the max message timer.  This is in milliseconds.
 76  */
 77 #define MAX_MSG_TIMEOUT         60000
 78 
 79 /* Call every ~1000 ms. */
 80 #define IPMI_TIMEOUT_TIME       1000
 81 
 82 /* How many jiffies does it take to get to the timeout time. */
 83 #define IPMI_TIMEOUT_JIFFIES    ((IPMI_TIMEOUT_TIME * HZ) / 1000)
 84 
 85 /*
 86  * Request events from the queue every second (this is the number of
 87  * IPMI_TIMEOUT_TIMES between event requests).  Hopefully, in the
 88  * future, IPMI will add a way to know immediately if an event is in
 89  * the queue and this silliness can go away.
 90  */
 91 #define IPMI_REQUEST_EV_TIME    (1000 / (IPMI_TIMEOUT_TIME))
 92 
 93 /*
 94  * The main "user" data structure.
 95  */
 96 struct ipmi_user {
 97         struct list_head link;
 98 
 99         /* Set to false when the user is destroyed. */
100         bool valid;
101 
102         struct kref refcount;
103 
104         /* The upper layer that handles receive messages. */
105         struct ipmi_user_hndl *handler;
106         void             *handler_data;
107 
108         /* The interface this user is bound to. */
109         ipmi_smi_t intf;
110 
111         /* Does this interface receive IPMI events? */
112         bool gets_events;
113 };
114 
115 struct cmd_rcvr {
116         struct list_head link;
117 
118         ipmi_user_t   user;
119         unsigned char netfn;
120         unsigned char cmd;
121         unsigned int  chans;
122 
123         /*
124          * This is used to form a linked lised during mass deletion.
125          * Since this is in an RCU list, we cannot use the link above
126          * or change any data until the RCU period completes.  So we
127          * use this next variable during mass deletion so we can have
128          * a list and don't have to wait and restart the search on
129          * every individual deletion of a command.
130          */
131         struct cmd_rcvr *next;
132 };
133 
134 struct seq_table {
135         unsigned int         inuse : 1;
136         unsigned int         broadcast : 1;
137 
138         unsigned long        timeout;
139         unsigned long        orig_timeout;
140         unsigned int         retries_left;
141 
142         /*
143          * To verify on an incoming send message response that this is
144          * the message that the response is for, we keep a sequence id
145          * and increment it every time we send a message.
146          */
147         long                 seqid;
148 
149         /*
150          * This is held so we can properly respond to the message on a
151          * timeout, and it is used to hold the temporary data for
152          * retransmission, too.
153          */
154         struct ipmi_recv_msg *recv_msg;
155 };
156 
157 /*
158  * Store the information in a msgid (long) to allow us to find a
159  * sequence table entry from the msgid.
160  */
161 #define STORE_SEQ_IN_MSGID(seq, seqid) (((seq&0xff)<<26) | (seqid&0x3ffffff))
162 
163 #define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \
164         do {                                                            \
165                 seq = ((msgid >> 26) & 0x3f);                           \
166                 seqid = (msgid & 0x3fffff);                             \
167         } while (0)
168 
169 #define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3fffff)
170 
171 struct ipmi_channel {
172         unsigned char medium;
173         unsigned char protocol;
174 
175         /*
176          * My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
177          * but may be changed by the user.
178          */
179         unsigned char address;
180 
181         /*
182          * My LUN.  This should generally stay the SMS LUN, but just in
183          * case...
184          */
185         unsigned char lun;
186 };
187 
188 #ifdef CONFIG_PROC_FS
189 struct ipmi_proc_entry {
190         char                   *name;
191         struct ipmi_proc_entry *next;
192 };
193 #endif
194 
195 struct bmc_device {
196         struct platform_device pdev;
197         struct ipmi_device_id  id;
198         unsigned char          guid[16];
199         int                    guid_set;
200         char                   name[16];
201         struct kref            usecount;
202 };
203 #define to_bmc_device(x) container_of((x), struct bmc_device, pdev.dev)
204 
205 /*
206  * Various statistics for IPMI, these index stats[] in the ipmi_smi
207  * structure.
208  */
209 enum ipmi_stat_indexes {
210         /* Commands we got from the user that were invalid. */
211         IPMI_STAT_sent_invalid_commands = 0,
212 
213         /* Commands we sent to the MC. */
214         IPMI_STAT_sent_local_commands,
215 
216         /* Responses from the MC that were delivered to a user. */
217         IPMI_STAT_handled_local_responses,
218 
219         /* Responses from the MC that were not delivered to a user. */
220         IPMI_STAT_unhandled_local_responses,
221 
222         /* Commands we sent out to the IPMB bus. */
223         IPMI_STAT_sent_ipmb_commands,
224 
225         /* Commands sent on the IPMB that had errors on the SEND CMD */
226         IPMI_STAT_sent_ipmb_command_errs,
227 
228         /* Each retransmit increments this count. */
229         IPMI_STAT_retransmitted_ipmb_commands,
230 
231         /*
232          * When a message times out (runs out of retransmits) this is
233          * incremented.
234          */
235         IPMI_STAT_timed_out_ipmb_commands,
236 
237         /*
238          * This is like above, but for broadcasts.  Broadcasts are
239          * *not* included in the above count (they are expected to
240          * time out).
241          */
242         IPMI_STAT_timed_out_ipmb_broadcasts,
243 
244         /* Responses I have sent to the IPMB bus. */
245         IPMI_STAT_sent_ipmb_responses,
246 
247         /* The response was delivered to the user. */
248         IPMI_STAT_handled_ipmb_responses,
249 
250         /* The response had invalid data in it. */
251         IPMI_STAT_invalid_ipmb_responses,
252 
253         /* The response didn't have anyone waiting for it. */
254         IPMI_STAT_unhandled_ipmb_responses,
255 
256         /* Commands we sent out to the IPMB bus. */
257         IPMI_STAT_sent_lan_commands,
258 
259         /* Commands sent on the IPMB that had errors on the SEND CMD */
260         IPMI_STAT_sent_lan_command_errs,
261 
262         /* Each retransmit increments this count. */
263         IPMI_STAT_retransmitted_lan_commands,
264 
265         /*
266          * When a message times out (runs out of retransmits) this is
267          * incremented.
268          */
269         IPMI_STAT_timed_out_lan_commands,
270 
271         /* Responses I have sent to the IPMB bus. */
272         IPMI_STAT_sent_lan_responses,
273 
274         /* The response was delivered to the user. */
275         IPMI_STAT_handled_lan_responses,
276 
277         /* The response had invalid data in it. */
278         IPMI_STAT_invalid_lan_responses,
279 
280         /* The response didn't have anyone waiting for it. */
281         IPMI_STAT_unhandled_lan_responses,
282 
283         /* The command was delivered to the user. */
284         IPMI_STAT_handled_commands,
285 
286         /* The command had invalid data in it. */
287         IPMI_STAT_invalid_commands,
288 
289         /* The command didn't have anyone waiting for it. */
290         IPMI_STAT_unhandled_commands,
291 
292         /* Invalid data in an event. */
293         IPMI_STAT_invalid_events,
294 
295         /* Events that were received with the proper format. */
296         IPMI_STAT_events,
297 
298         /* Retransmissions on IPMB that failed. */
299         IPMI_STAT_dropped_rexmit_ipmb_commands,
300 
301         /* Retransmissions on LAN that failed. */
302         IPMI_STAT_dropped_rexmit_lan_commands,
303 
304         /* This *must* remain last, add new values above this. */
305         IPMI_NUM_STATS
306 };
307 
308 
309 #define IPMI_IPMB_NUM_SEQ       64
310 #define IPMI_MAX_CHANNELS       16
311 struct ipmi_smi {
312         /* What interface number are we? */
313         int intf_num;
314 
315         struct kref refcount;
316 
317         /* Set when the interface is being unregistered. */
318         bool in_shutdown;
319 
320         /* Used for a list of interfaces. */
321         struct list_head link;
322 
323         /*
324          * The list of upper layers that are using me.  seq_lock
325          * protects this.
326          */
327         struct list_head users;
328 
329         /* Information to supply to users. */
330         unsigned char ipmi_version_major;
331         unsigned char ipmi_version_minor;
332 
333         /* Used for wake ups at startup. */
334         wait_queue_head_t waitq;
335 
336         struct bmc_device *bmc;
337         char *my_dev_name;
338 
339         /*
340          * This is the lower-layer's sender routine.  Note that you
341          * must either be holding the ipmi_interfaces_mutex or be in
342          * an umpreemptible region to use this.  You must fetch the
343          * value into a local variable and make sure it is not NULL.
344          */
345         const struct ipmi_smi_handlers *handlers;
346         void                     *send_info;
347 
348 #ifdef CONFIG_PROC_FS
349         /* A list of proc entries for this interface. */
350         struct mutex           proc_entry_lock;
351         struct ipmi_proc_entry *proc_entries;
352 #endif
353 
354         /* Driver-model device for the system interface. */
355         struct device          *si_dev;
356 
357         /*
358          * A table of sequence numbers for this interface.  We use the
359          * sequence numbers for IPMB messages that go out of the
360          * interface to match them up with their responses.  A routine
361          * is called periodically to time the items in this list.
362          */
363         spinlock_t       seq_lock;
364         struct seq_table seq_table[IPMI_IPMB_NUM_SEQ];
365         int curr_seq;
366 
367         /*
368          * Messages queued for delivery.  If delivery fails (out of memory
369          * for instance), They will stay in here to be processed later in a
370          * periodic timer interrupt.  The tasklet is for handling received
371          * messages directly from the handler.
372          */
373         spinlock_t       waiting_rcv_msgs_lock;
374         struct list_head waiting_rcv_msgs;
375         atomic_t         watchdog_pretimeouts_to_deliver;
376         struct tasklet_struct recv_tasklet;
377 
378         spinlock_t             xmit_msgs_lock;
379         struct list_head       xmit_msgs;
380         struct ipmi_smi_msg    *curr_msg;
381         struct list_head       hp_xmit_msgs;
382 
383         /*
384          * The list of command receivers that are registered for commands
385          * on this interface.
386          */
387         struct mutex     cmd_rcvrs_mutex;
388         struct list_head cmd_rcvrs;
389 
390         /*
391          * Events that were queues because no one was there to receive
392          * them.
393          */
394         spinlock_t       events_lock; /* For dealing with event stuff. */
395         struct list_head waiting_events;
396         unsigned int     waiting_events_count; /* How many events in queue? */
397         char             delivering_events;
398         char             event_msg_printed;
399         atomic_t         event_waiters;
400         unsigned int     ticks_to_req_ev;
401         int              last_needs_timer;
402 
403         /*
404          * The event receiver for my BMC, only really used at panic
405          * shutdown as a place to store this.
406          */
407         unsigned char event_receiver;
408         unsigned char event_receiver_lun;
409         unsigned char local_sel_device;
410         unsigned char local_event_generator;
411 
412         /* For handling of maintenance mode. */
413         int maintenance_mode;
414         bool maintenance_mode_enable;
415         int auto_maintenance_timeout;
416         spinlock_t maintenance_mode_lock; /* Used in a timer... */
417 
418         /*
419          * A cheap hack, if this is non-null and a message to an
420          * interface comes in with a NULL user, call this routine with
421          * it.  Note that the message will still be freed by the
422          * caller.  This only works on the system interface.
423          */
424         void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);
425 
426         /*
427          * When we are scanning the channels for an SMI, this will
428          * tell which channel we are scanning.
429          */
430         int curr_channel;
431 
432         /* Channel information */
433         struct ipmi_channel channels[IPMI_MAX_CHANNELS];
434 
435         /* Proc FS stuff. */
436         struct proc_dir_entry *proc_dir;
437         char                  proc_dir_name[10];
438 
439         atomic_t stats[IPMI_NUM_STATS];
440 
441         /*
442          * run_to_completion duplicate of smb_info, smi_info
443          * and ipmi_serial_info structures. Used to decrease numbers of
444          * parameters passed by "low" level IPMI code.
445          */
446         int run_to_completion;
447 };
448 #define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev)
449 
450 /**
451  * The driver model view of the IPMI messaging driver.
452  */
453 static struct platform_driver ipmidriver = {
454         .driver = {
455                 .name = "ipmi",
456                 .bus = &platform_bus_type
457         }
458 };
459 static DEFINE_MUTEX(ipmidriver_mutex);
460 
461 static LIST_HEAD(ipmi_interfaces);
462 static DEFINE_MUTEX(ipmi_interfaces_mutex);
463 
464 /*
465  * List of watchers that want to know when smi's are added and deleted.
466  */
467 static LIST_HEAD(smi_watchers);
468 static DEFINE_MUTEX(smi_watchers_mutex);
469 
470 #define ipmi_inc_stat(intf, stat) \
471         atomic_inc(&(intf)->stats[IPMI_STAT_ ## stat])
472 #define ipmi_get_stat(intf, stat) \
473         ((unsigned int) atomic_read(&(intf)->stats[IPMI_STAT_ ## stat]))
474 
475 static char *addr_src_to_str[] = { "invalid", "hotmod", "hardcoded", "SPMI",
476                                    "ACPI", "SMBIOS", "PCI",
477                                    "device-tree", "default" };
478 
479 const char *ipmi_addr_src_to_str(enum ipmi_addr_src src)
480 {
481         if (src > SI_DEFAULT)
482                 src = 0; /* Invalid */
483         return addr_src_to_str[src];
484 }
485 EXPORT_SYMBOL(ipmi_addr_src_to_str);
486 
487 static int is_lan_addr(struct ipmi_addr *addr)
488 {
489         return addr->addr_type == IPMI_LAN_ADDR_TYPE;
490 }
491 
492 static int is_ipmb_addr(struct ipmi_addr *addr)
493 {
494         return addr->addr_type == IPMI_IPMB_ADDR_TYPE;
495 }
496 
497 static int is_ipmb_bcast_addr(struct ipmi_addr *addr)
498 {
499         return addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE;
500 }
501 
502 static void free_recv_msg_list(struct list_head *q)
503 {
504         struct ipmi_recv_msg *msg, *msg2;
505 
506         list_for_each_entry_safe(msg, msg2, q, link) {
507                 list_del(&msg->link);
508                 ipmi_free_recv_msg(msg);
509         }
510 }
511 
512 static void free_smi_msg_list(struct list_head *q)
513 {
514         struct ipmi_smi_msg *msg, *msg2;
515 
516         list_for_each_entry_safe(msg, msg2, q, link) {
517                 list_del(&msg->link);
518                 ipmi_free_smi_msg(msg);
519         }
520 }
521 
522 static void clean_up_interface_data(ipmi_smi_t intf)
523 {
524         int              i;
525         struct cmd_rcvr  *rcvr, *rcvr2;
526         struct list_head list;
527 
528         tasklet_kill(&intf->recv_tasklet);
529 
530         free_smi_msg_list(&intf->waiting_rcv_msgs);
531         free_recv_msg_list(&intf->waiting_events);
532 
533         /*
534          * Wholesale remove all the entries from the list in the
535          * interface and wait for RCU to know that none are in use.
536          */
537         mutex_lock(&intf->cmd_rcvrs_mutex);
538         INIT_LIST_HEAD(&list);
539         list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu);
540         mutex_unlock(&intf->cmd_rcvrs_mutex);
541 
542         list_for_each_entry_safe(rcvr, rcvr2, &list, link)
543                 kfree(rcvr);
544 
545         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
546                 if ((intf->seq_table[i].inuse)
547                                         && (intf->seq_table[i].recv_msg))
548                         ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
549         }
550 }
551 
552 static void intf_free(struct kref *ref)
553 {
554         ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount);
555 
556         clean_up_interface_data(intf);
557         kfree(intf);
558 }
559 
560 struct watcher_entry {
561         int              intf_num;
562         ipmi_smi_t       intf;
563         struct list_head link;
564 };
565 
566 int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
567 {
568         ipmi_smi_t intf;
569         LIST_HEAD(to_deliver);
570         struct watcher_entry *e, *e2;
571 
572         mutex_lock(&smi_watchers_mutex);
573 
574         mutex_lock(&ipmi_interfaces_mutex);
575 
576         /* Build a list of things to deliver. */
577         list_for_each_entry(intf, &ipmi_interfaces, link) {
578                 if (intf->intf_num == -1)
579                         continue;
580                 e = kmalloc(sizeof(*e), GFP_KERNEL);
581                 if (!e)
582                         goto out_err;
583                 kref_get(&intf->refcount);
584                 e->intf = intf;
585                 e->intf_num = intf->intf_num;
586                 list_add_tail(&e->link, &to_deliver);
587         }
588 
589         /* We will succeed, so add it to the list. */
590         list_add(&watcher->link, &smi_watchers);
591 
592         mutex_unlock(&ipmi_interfaces_mutex);
593 
594         list_for_each_entry_safe(e, e2, &to_deliver, link) {
595                 list_del(&e->link);
596                 watcher->new_smi(e->intf_num, e->intf->si_dev);
597                 kref_put(&e->intf->refcount, intf_free);
598                 kfree(e);
599         }
600 
601         mutex_unlock(&smi_watchers_mutex);
602 
603         return 0;
604 
605  out_err:
606         mutex_unlock(&ipmi_interfaces_mutex);
607         mutex_unlock(&smi_watchers_mutex);
608         list_for_each_entry_safe(e, e2, &to_deliver, link) {
609                 list_del(&e->link);
610                 kref_put(&e->intf->refcount, intf_free);
611                 kfree(e);
612         }
613         return -ENOMEM;
614 }
615 EXPORT_SYMBOL(ipmi_smi_watcher_register);
616 
617 int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher)
618 {
619         mutex_lock(&smi_watchers_mutex);
620         list_del(&(watcher->link));
621         mutex_unlock(&smi_watchers_mutex);
622         return 0;
623 }
624 EXPORT_SYMBOL(ipmi_smi_watcher_unregister);
625 
626 /*
627  * Must be called with smi_watchers_mutex held.
628  */
629 static void
630 call_smi_watchers(int i, struct device *dev)
631 {
632         struct ipmi_smi_watcher *w;
633 
634         list_for_each_entry(w, &smi_watchers, link) {
635                 if (try_module_get(w->owner)) {
636                         w->new_smi(i, dev);
637                         module_put(w->owner);
638                 }
639         }
640 }
641 
642 static int
643 ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
644 {
645         if (addr1->addr_type != addr2->addr_type)
646                 return 0;
647 
648         if (addr1->channel != addr2->channel)
649                 return 0;
650 
651         if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
652                 struct ipmi_system_interface_addr *smi_addr1
653                     = (struct ipmi_system_interface_addr *) addr1;
654                 struct ipmi_system_interface_addr *smi_addr2
655                     = (struct ipmi_system_interface_addr *) addr2;
656                 return (smi_addr1->lun == smi_addr2->lun);
657         }
658 
659         if (is_ipmb_addr(addr1) || is_ipmb_bcast_addr(addr1)) {
660                 struct ipmi_ipmb_addr *ipmb_addr1
661                     = (struct ipmi_ipmb_addr *) addr1;
662                 struct ipmi_ipmb_addr *ipmb_addr2
663                     = (struct ipmi_ipmb_addr *) addr2;
664 
665                 return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr)
666                         && (ipmb_addr1->lun == ipmb_addr2->lun));
667         }
668 
669         if (is_lan_addr(addr1)) {
670                 struct ipmi_lan_addr *lan_addr1
671                         = (struct ipmi_lan_addr *) addr1;
672                 struct ipmi_lan_addr *lan_addr2
673                     = (struct ipmi_lan_addr *) addr2;
674 
675                 return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID)
676                         && (lan_addr1->local_SWID == lan_addr2->local_SWID)
677                         && (lan_addr1->session_handle
678                             == lan_addr2->session_handle)
679                         && (lan_addr1->lun == lan_addr2->lun));
680         }
681 
682         return 1;
683 }
684 
685 int ipmi_validate_addr(struct ipmi_addr *addr, int len)
686 {
687         if (len < sizeof(struct ipmi_system_interface_addr))
688                 return -EINVAL;
689 
690         if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
691                 if (addr->channel != IPMI_BMC_CHANNEL)
692                         return -EINVAL;
693                 return 0;
694         }
695 
696         if ((addr->channel == IPMI_BMC_CHANNEL)
697             || (addr->channel >= IPMI_MAX_CHANNELS)
698             || (addr->channel < 0))
699                 return -EINVAL;
700 
701         if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
702                 if (len < sizeof(struct ipmi_ipmb_addr))
703                         return -EINVAL;
704                 return 0;
705         }
706 
707         if (is_lan_addr(addr)) {
708                 if (len < sizeof(struct ipmi_lan_addr))
709                         return -EINVAL;
710                 return 0;
711         }
712 
713         return -EINVAL;
714 }
715 EXPORT_SYMBOL(ipmi_validate_addr);
716 
717 unsigned int ipmi_addr_length(int addr_type)
718 {
719         if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
720                 return sizeof(struct ipmi_system_interface_addr);
721 
722         if ((addr_type == IPMI_IPMB_ADDR_TYPE)
723                         || (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
724                 return sizeof(struct ipmi_ipmb_addr);
725 
726         if (addr_type == IPMI_LAN_ADDR_TYPE)
727                 return sizeof(struct ipmi_lan_addr);
728 
729         return 0;
730 }
731 EXPORT_SYMBOL(ipmi_addr_length);
732 
733 static void deliver_response(struct ipmi_recv_msg *msg)
734 {
735         if (!msg->user) {
736                 ipmi_smi_t    intf = msg->user_msg_data;
737 
738                 /* Special handling for NULL users. */
739                 if (intf->null_user_handler) {
740                         intf->null_user_handler(intf, msg);
741                         ipmi_inc_stat(intf, handled_local_responses);
742                 } else {
743                         /* No handler, so give up. */
744                         ipmi_inc_stat(intf, unhandled_local_responses);
745                 }
746                 ipmi_free_recv_msg(msg);
747         } else if (!oops_in_progress) {
748                 /*
749                  * If we are running in the panic context, calling the
750                  * receive handler doesn't much meaning and has a deadlock
751                  * risk.  At this moment, simply skip it in that case.
752                  */
753 
754                 ipmi_user_t user = msg->user;
755                 user->handler->ipmi_recv_hndl(msg, user->handler_data);
756         }
757 }
758 
759 static void
760 deliver_err_response(struct ipmi_recv_msg *msg, int err)
761 {
762         msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
763         msg->msg_data[0] = err;
764         msg->msg.netfn |= 1; /* Convert to a response. */
765         msg->msg.data_len = 1;
766         msg->msg.data = msg->msg_data;
767         deliver_response(msg);
768 }
769 
770 /*
771  * Find the next sequence number not being used and add the given
772  * message with the given timeout to the sequence table.  This must be
773  * called with the interface's seq_lock held.
774  */
775 static int intf_next_seq(ipmi_smi_t           intf,
776                          struct ipmi_recv_msg *recv_msg,
777                          unsigned long        timeout,
778                          int                  retries,
779                          int                  broadcast,
780                          unsigned char        *seq,
781                          long                 *seqid)
782 {
783         int          rv = 0;
784         unsigned int i;
785 
786         for (i = intf->curr_seq; (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq;
787                                         i = (i+1)%IPMI_IPMB_NUM_SEQ) {
788                 if (!intf->seq_table[i].inuse)
789                         break;
790         }
791 
792         if (!intf->seq_table[i].inuse) {
793                 intf->seq_table[i].recv_msg = recv_msg;
794 
795                 /*
796                  * Start with the maximum timeout, when the send response
797                  * comes in we will start the real timer.
798                  */
799                 intf->seq_table[i].timeout = MAX_MSG_TIMEOUT;
800                 intf->seq_table[i].orig_timeout = timeout;
801                 intf->seq_table[i].retries_left = retries;
802                 intf->seq_table[i].broadcast = broadcast;
803                 intf->seq_table[i].inuse = 1;
804                 intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid);
805                 *seq = i;
806                 *seqid = intf->seq_table[i].seqid;
807                 intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ;
808                 need_waiter(intf);
809         } else {
810                 rv = -EAGAIN;
811         }
812 
813         return rv;
814 }
815 
816 /*
817  * Return the receive message for the given sequence number and
818  * release the sequence number so it can be reused.  Some other data
819  * is passed in to be sure the message matches up correctly (to help
820  * guard against message coming in after their timeout and the
821  * sequence number being reused).
822  */
823 static int intf_find_seq(ipmi_smi_t           intf,
824                          unsigned char        seq,
825                          short                channel,
826                          unsigned char        cmd,
827                          unsigned char        netfn,
828                          struct ipmi_addr     *addr,
829                          struct ipmi_recv_msg **recv_msg)
830 {
831         int           rv = -ENODEV;
832         unsigned long flags;
833 
834         if (seq >= IPMI_IPMB_NUM_SEQ)
835                 return -EINVAL;
836 
837         spin_lock_irqsave(&(intf->seq_lock), flags);
838         if (intf->seq_table[seq].inuse) {
839                 struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg;
840 
841                 if ((msg->addr.channel == channel) && (msg->msg.cmd == cmd)
842                                 && (msg->msg.netfn == netfn)
843                                 && (ipmi_addr_equal(addr, &(msg->addr)))) {
844                         *recv_msg = msg;
845                         intf->seq_table[seq].inuse = 0;
846                         rv = 0;
847                 }
848         }
849         spin_unlock_irqrestore(&(intf->seq_lock), flags);
850 
851         return rv;
852 }
853 
854 
855 /* Start the timer for a specific sequence table entry. */
856 static int intf_start_seq_timer(ipmi_smi_t intf,
857                                 long       msgid)
858 {
859         int           rv = -ENODEV;
860         unsigned long flags;
861         unsigned char seq;
862         unsigned long seqid;
863 
864 
865         GET_SEQ_FROM_MSGID(msgid, seq, seqid);
866 
867         spin_lock_irqsave(&(intf->seq_lock), flags);
868         /*
869          * We do this verification because the user can be deleted
870          * while a message is outstanding.
871          */
872         if ((intf->seq_table[seq].inuse)
873                                 && (intf->seq_table[seq].seqid == seqid)) {
874                 struct seq_table *ent = &(intf->seq_table[seq]);
875                 ent->timeout = ent->orig_timeout;
876                 rv = 0;
877         }
878         spin_unlock_irqrestore(&(intf->seq_lock), flags);
879 
880         return rv;
881 }
882 
883 /* Got an error for the send message for a specific sequence number. */
884 static int intf_err_seq(ipmi_smi_t   intf,
885                         long         msgid,
886                         unsigned int err)
887 {
888         int                  rv = -ENODEV;
889         unsigned long        flags;
890         unsigned char        seq;
891         unsigned long        seqid;
892         struct ipmi_recv_msg *msg = NULL;
893 
894 
895         GET_SEQ_FROM_MSGID(msgid, seq, seqid);
896 
897         spin_lock_irqsave(&(intf->seq_lock), flags);
898         /*
899          * We do this verification because the user can be deleted
900          * while a message is outstanding.
901          */
902         if ((intf->seq_table[seq].inuse)
903                                 && (intf->seq_table[seq].seqid == seqid)) {
904                 struct seq_table *ent = &(intf->seq_table[seq]);
905 
906                 ent->inuse = 0;
907                 msg = ent->recv_msg;
908                 rv = 0;
909         }
910         spin_unlock_irqrestore(&(intf->seq_lock), flags);
911 
912         if (msg)
913                 deliver_err_response(msg, err);
914 
915         return rv;
916 }
917 
918 
919 int ipmi_create_user(unsigned int          if_num,
920                      struct ipmi_user_hndl *handler,
921                      void                  *handler_data,
922                      ipmi_user_t           *user)
923 {
924         unsigned long flags;
925         ipmi_user_t   new_user;
926         int           rv = 0;
927         ipmi_smi_t    intf;
928 
929         /*
930          * There is no module usecount here, because it's not
931          * required.  Since this can only be used by and called from
932          * other modules, they will implicitly use this module, and
933          * thus this can't be removed unless the other modules are
934          * removed.
935          */
936 
937         if (handler == NULL)
938                 return -EINVAL;
939 
940         /*
941          * Make sure the driver is actually initialized, this handles
942          * problems with initialization order.
943          */
944         if (!initialized) {
945                 rv = ipmi_init_msghandler();
946                 if (rv)
947                         return rv;
948 
949                 /*
950                  * The init code doesn't return an error if it was turned
951                  * off, but it won't initialize.  Check that.
952                  */
953                 if (!initialized)
954                         return -ENODEV;
955         }
956 
957         new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
958         if (!new_user)
959                 return -ENOMEM;
960 
961         mutex_lock(&ipmi_interfaces_mutex);
962         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
963                 if (intf->intf_num == if_num)
964                         goto found;
965         }
966         /* Not found, return an error */
967         rv = -EINVAL;
968         goto out_kfree;
969 
970  found:
971         /* Note that each existing user holds a refcount to the interface. */
972         kref_get(&intf->refcount);
973 
974         kref_init(&new_user->refcount);
975         new_user->handler = handler;
976         new_user->handler_data = handler_data;
977         new_user->intf = intf;
978         new_user->gets_events = false;
979 
980         if (!try_module_get(intf->handlers->owner)) {
981                 rv = -ENODEV;
982                 goto out_kref;
983         }
984 
985         if (intf->handlers->inc_usecount) {
986                 rv = intf->handlers->inc_usecount(intf->send_info);
987                 if (rv) {
988                         module_put(intf->handlers->owner);
989                         goto out_kref;
990                 }
991         }
992 
993         /*
994          * Hold the lock so intf->handlers is guaranteed to be good
995          * until now
996          */
997         mutex_unlock(&ipmi_interfaces_mutex);
998 
999         new_user->valid = true;
1000         spin_lock_irqsave(&intf->seq_lock, flags);
1001         list_add_rcu(&new_user->link, &intf->users);
1002         spin_unlock_irqrestore(&intf->seq_lock, flags);
1003         if (handler->ipmi_watchdog_pretimeout) {
1004                 /* User wants pretimeouts, so make sure to watch for them. */
1005                 if (atomic_inc_return(&intf->event_waiters) == 1)
1006                         need_waiter(intf);
1007         }
1008         *user = new_user;
1009         return 0;
1010 
1011 out_kref:
1012         kref_put(&intf->refcount, intf_free);
1013 out_kfree:
1014         mutex_unlock(&ipmi_interfaces_mutex);
1015         kfree(new_user);
1016         return rv;
1017 }
1018 EXPORT_SYMBOL(ipmi_create_user);
1019 
1020 int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
1021 {
1022         int           rv = 0;
1023         ipmi_smi_t    intf;
1024         const struct ipmi_smi_handlers *handlers;
1025 
1026         mutex_lock(&ipmi_interfaces_mutex);
1027         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
1028                 if (intf->intf_num == if_num)
1029                         goto found;
1030         }
1031         /* Not found, return an error */
1032         rv = -EINVAL;
1033         mutex_unlock(&ipmi_interfaces_mutex);
1034         return rv;
1035 
1036 found:
1037         handlers = intf->handlers;
1038         rv = -ENOSYS;
1039         if (handlers->get_smi_info)
1040                 rv = handlers->get_smi_info(intf->send_info, data);
1041         mutex_unlock(&ipmi_interfaces_mutex);
1042 
1043         return rv;
1044 }
1045 EXPORT_SYMBOL(ipmi_get_smi_info);
1046 
1047 static void free_user(struct kref *ref)
1048 {
1049         ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
1050         kfree(user);
1051 }
1052 
1053 int ipmi_destroy_user(ipmi_user_t user)
1054 {
1055         ipmi_smi_t       intf = user->intf;
1056         int              i;
1057         unsigned long    flags;
1058         struct cmd_rcvr  *rcvr;
1059         struct cmd_rcvr  *rcvrs = NULL;
1060 
1061         user->valid = false;
1062 
1063         if (user->handler->ipmi_watchdog_pretimeout)
1064                 atomic_dec(&intf->event_waiters);
1065 
1066         if (user->gets_events)
1067                 atomic_dec(&intf->event_waiters);
1068 
1069         /* Remove the user from the interface's sequence table. */
1070         spin_lock_irqsave(&intf->seq_lock, flags);
1071         list_del_rcu(&user->link);
1072 
1073         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
1074                 if (intf->seq_table[i].inuse
1075                     && (intf->seq_table[i].recv_msg->user == user)) {
1076                         intf->seq_table[i].inuse = 0;
1077                         ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
1078                 }
1079         }
1080         spin_unlock_irqrestore(&intf->seq_lock, flags);
1081 
1082         /*
1083          * Remove the user from the command receiver's table.  First
1084          * we build a list of everything (not using the standard link,
1085          * since other things may be using it till we do
1086          * synchronize_rcu()) then free everything in that list.
1087          */
1088         mutex_lock(&intf->cmd_rcvrs_mutex);
1089         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1090                 if (rcvr->user == user) {
1091                         list_del_rcu(&rcvr->link);
1092                         rcvr->next = rcvrs;
1093                         rcvrs = rcvr;
1094                 }
1095         }
1096         mutex_unlock(&intf->cmd_rcvrs_mutex);
1097         synchronize_rcu();
1098         while (rcvrs) {
1099                 rcvr = rcvrs;
1100                 rcvrs = rcvr->next;
1101                 kfree(rcvr);
1102         }
1103 
1104         mutex_lock(&ipmi_interfaces_mutex);
1105         if (intf->handlers) {
1106                 module_put(intf->handlers->owner);
1107                 if (intf->handlers->dec_usecount)
1108                         intf->handlers->dec_usecount(intf->send_info);
1109         }
1110         mutex_unlock(&ipmi_interfaces_mutex);
1111 
1112         kref_put(&intf->refcount, intf_free);
1113 
1114         kref_put(&user->refcount, free_user);
1115 
1116         return 0;
1117 }
1118 EXPORT_SYMBOL(ipmi_destroy_user);
1119 
1120 void ipmi_get_version(ipmi_user_t   user,
1121                       unsigned char *major,
1122                       unsigned char *minor)
1123 {
1124         *major = user->intf->ipmi_version_major;
1125         *minor = user->intf->ipmi_version_minor;
1126 }
1127 EXPORT_SYMBOL(ipmi_get_version);
1128 
1129 int ipmi_set_my_address(ipmi_user_t   user,
1130                         unsigned int  channel,
1131                         unsigned char address)
1132 {
1133         if (channel >= IPMI_MAX_CHANNELS)
1134                 return -EINVAL;
1135         user->intf->channels[channel].address = address;
1136         return 0;
1137 }
1138 EXPORT_SYMBOL(ipmi_set_my_address);
1139 
1140 int ipmi_get_my_address(ipmi_user_t   user,
1141                         unsigned int  channel,
1142                         unsigned char *address)
1143 {
1144         if (channel >= IPMI_MAX_CHANNELS)
1145                 return -EINVAL;
1146         *address = user->intf->channels[channel].address;
1147         return 0;
1148 }
1149 EXPORT_SYMBOL(ipmi_get_my_address);
1150 
1151 int ipmi_set_my_LUN(ipmi_user_t   user,
1152                     unsigned int  channel,
1153                     unsigned char LUN)
1154 {
1155         if (channel >= IPMI_MAX_CHANNELS)
1156                 return -EINVAL;
1157         user->intf->channels[channel].lun = LUN & 0x3;
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(ipmi_set_my_LUN);
1161 
1162 int ipmi_get_my_LUN(ipmi_user_t   user,
1163                     unsigned int  channel,
1164                     unsigned char *address)
1165 {
1166         if (channel >= IPMI_MAX_CHANNELS)
1167                 return -EINVAL;
1168         *address = user->intf->channels[channel].lun;
1169         return 0;
1170 }
1171 EXPORT_SYMBOL(ipmi_get_my_LUN);
1172 
1173 int ipmi_get_maintenance_mode(ipmi_user_t user)
1174 {
1175         int           mode;
1176         unsigned long flags;
1177 
1178         spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
1179         mode = user->intf->maintenance_mode;
1180         spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);
1181 
1182         return mode;
1183 }
1184 EXPORT_SYMBOL(ipmi_get_maintenance_mode);
1185 
1186 static void maintenance_mode_update(ipmi_smi_t intf)
1187 {
1188         if (intf->handlers->set_maintenance_mode)
1189                 intf->handlers->set_maintenance_mode(
1190                         intf->send_info, intf->maintenance_mode_enable);
1191 }
1192 
1193 int ipmi_set_maintenance_mode(ipmi_user_t user, int mode)
1194 {
1195         int           rv = 0;
1196         unsigned long flags;
1197         ipmi_smi_t    intf = user->intf;
1198 
1199         spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
1200         if (intf->maintenance_mode != mode) {
1201                 switch (mode) {
1202                 case IPMI_MAINTENANCE_MODE_AUTO:
1203                         intf->maintenance_mode_enable
1204                                 = (intf->auto_maintenance_timeout > 0);
1205                         break;
1206 
1207                 case IPMI_MAINTENANCE_MODE_OFF:
1208                         intf->maintenance_mode_enable = false;
1209                         break;
1210 
1211                 case IPMI_MAINTENANCE_MODE_ON:
1212                         intf->maintenance_mode_enable = true;
1213                         break;
1214 
1215                 default:
1216                         rv = -EINVAL;
1217                         goto out_unlock;
1218                 }
1219                 intf->maintenance_mode = mode;
1220 
1221                 maintenance_mode_update(intf);
1222         }
1223  out_unlock:
1224         spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags);
1225 
1226         return rv;
1227 }
1228 EXPORT_SYMBOL(ipmi_set_maintenance_mode);
1229 
1230 int ipmi_set_gets_events(ipmi_user_t user, bool val)
1231 {
1232         unsigned long        flags;
1233         ipmi_smi_t           intf = user->intf;
1234         struct ipmi_recv_msg *msg, *msg2;
1235         struct list_head     msgs;
1236 
1237         INIT_LIST_HEAD(&msgs);
1238 
1239         spin_lock_irqsave(&intf->events_lock, flags);
1240         if (user->gets_events == val)
1241                 goto out;
1242 
1243         user->gets_events = val;
1244 
1245         if (val) {
1246                 if (atomic_inc_return(&intf->event_waiters) == 1)
1247                         need_waiter(intf);
1248         } else {
1249                 atomic_dec(&intf->event_waiters);
1250         }
1251 
1252         if (intf->delivering_events)
1253                 /*
1254                  * Another thread is delivering events for this, so
1255                  * let it handle any new events.
1256                  */
1257                 goto out;
1258 
1259         /* Deliver any queued events. */
1260         while (user->gets_events && !list_empty(&intf->waiting_events)) {
1261                 list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link)
1262                         list_move_tail(&msg->link, &msgs);
1263                 intf->waiting_events_count = 0;
1264                 if (intf->event_msg_printed) {
1265                         printk(KERN_WARNING PFX "Event queue no longer"
1266                                " full\n");
1267                         intf->event_msg_printed = 0;
1268                 }
1269 
1270                 intf->delivering_events = 1;
1271                 spin_unlock_irqrestore(&intf->events_lock, flags);
1272 
1273                 list_for_each_entry_safe(msg, msg2, &msgs, link) {
1274                         msg->user = user;
1275                         kref_get(&user->refcount);
1276                         deliver_response(msg);
1277                 }
1278 
1279                 spin_lock_irqsave(&intf->events_lock, flags);
1280                 intf->delivering_events = 0;
1281         }
1282 
1283  out:
1284         spin_unlock_irqrestore(&intf->events_lock, flags);
1285 
1286         return 0;
1287 }
1288 EXPORT_SYMBOL(ipmi_set_gets_events);
1289 
1290 static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t    intf,
1291                                       unsigned char netfn,
1292                                       unsigned char cmd,
1293                                       unsigned char chan)
1294 {
1295         struct cmd_rcvr *rcvr;
1296 
1297         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1298                 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
1299                                         && (rcvr->chans & (1 << chan)))
1300                         return rcvr;
1301         }
1302         return NULL;
1303 }
1304 
1305 static int is_cmd_rcvr_exclusive(ipmi_smi_t    intf,
1306                                  unsigned char netfn,
1307                                  unsigned char cmd,
1308                                  unsigned int  chans)
1309 {
1310         struct cmd_rcvr *rcvr;
1311 
1312         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1313                 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
1314                                         && (rcvr->chans & chans))
1315                         return 0;
1316         }
1317         return 1;
1318 }
1319 
1320 int ipmi_register_for_cmd(ipmi_user_t   user,
1321                           unsigned char netfn,
1322                           unsigned char cmd,
1323                           unsigned int  chans)
1324 {
1325         ipmi_smi_t      intf = user->intf;
1326         struct cmd_rcvr *rcvr;
1327         int             rv = 0;
1328 
1329 
1330         rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
1331         if (!rcvr)
1332                 return -ENOMEM;
1333         rcvr->cmd = cmd;
1334         rcvr->netfn = netfn;
1335         rcvr->chans = chans;
1336         rcvr->user = user;
1337 
1338         mutex_lock(&intf->cmd_rcvrs_mutex);
1339         /* Make sure the command/netfn is not already registered. */
1340         if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) {
1341                 rv = -EBUSY;
1342                 goto out_unlock;
1343         }
1344 
1345         if (atomic_inc_return(&intf->event_waiters) == 1)
1346                 need_waiter(intf);
1347 
1348         list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
1349 
1350  out_unlock:
1351         mutex_unlock(&intf->cmd_rcvrs_mutex);
1352         if (rv)
1353                 kfree(rcvr);
1354 
1355         return rv;
1356 }
1357 EXPORT_SYMBOL(ipmi_register_for_cmd);
1358 
1359 int ipmi_unregister_for_cmd(ipmi_user_t   user,
1360                             unsigned char netfn,
1361                             unsigned char cmd,
1362                             unsigned int  chans)
1363 {
1364         ipmi_smi_t      intf = user->intf;
1365         struct cmd_rcvr *rcvr;
1366         struct cmd_rcvr *rcvrs = NULL;
1367         int i, rv = -ENOENT;
1368 
1369         mutex_lock(&intf->cmd_rcvrs_mutex);
1370         for (i = 0; i < IPMI_NUM_CHANNELS; i++) {
1371                 if (((1 << i) & chans) == 0)
1372                         continue;
1373                 rcvr = find_cmd_rcvr(intf, netfn, cmd, i);
1374                 if (rcvr == NULL)
1375                         continue;
1376                 if (rcvr->user == user) {
1377                         rv = 0;
1378                         rcvr->chans &= ~chans;
1379                         if (rcvr->chans == 0) {
1380                                 list_del_rcu(&rcvr->link);
1381                                 rcvr->next = rcvrs;
1382                                 rcvrs = rcvr;
1383                         }
1384                 }
1385         }
1386         mutex_unlock(&intf->cmd_rcvrs_mutex);
1387         synchronize_rcu();
1388         while (rcvrs) {
1389                 atomic_dec(&intf->event_waiters);
1390                 rcvr = rcvrs;
1391                 rcvrs = rcvr->next;
1392                 kfree(rcvr);
1393         }
1394         return rv;
1395 }
1396 EXPORT_SYMBOL(ipmi_unregister_for_cmd);
1397 
1398 static unsigned char
1399 ipmb_checksum(unsigned char *data, int size)
1400 {
1401         unsigned char csum = 0;
1402 
1403         for (; size > 0; size--, data++)
1404                 csum += *data;
1405 
1406         return -csum;
1407 }
1408 
1409 static inline void format_ipmb_msg(struct ipmi_smi_msg   *smi_msg,
1410                                    struct kernel_ipmi_msg *msg,
1411                                    struct ipmi_ipmb_addr *ipmb_addr,
1412                                    long                  msgid,
1413                                    unsigned char         ipmb_seq,
1414                                    int                   broadcast,
1415                                    unsigned char         source_address,
1416                                    unsigned char         source_lun)
1417 {
1418         int i = broadcast;
1419 
1420         /* Format the IPMB header data. */
1421         smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
1422         smi_msg->data[1] = IPMI_SEND_MSG_CMD;
1423         smi_msg->data[2] = ipmb_addr->channel;
1424         if (broadcast)
1425                 smi_msg->data[3] = 0;
1426         smi_msg->data[i+3] = ipmb_addr->slave_addr;
1427         smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3);
1428         smi_msg->data[i+5] = ipmb_checksum(&(smi_msg->data[i+3]), 2);
1429         smi_msg->data[i+6] = source_address;
1430         smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun;
1431         smi_msg->data[i+8] = msg->cmd;
1432 
1433         /* Now tack on the data to the message. */
1434         if (msg->data_len > 0)
1435                 memcpy(&(smi_msg->data[i+9]), msg->data,
1436                        msg->data_len);
1437         smi_msg->data_size = msg->data_len + 9;
1438 
1439         /* Now calculate the checksum and tack it on. */
1440         smi_msg->data[i+smi_msg->data_size]
1441                 = ipmb_checksum(&(smi_msg->data[i+6]),
1442                                 smi_msg->data_size-6);
1443 
1444         /*
1445          * Add on the checksum size and the offset from the
1446          * broadcast.
1447          */
1448         smi_msg->data_size += 1 + i;
1449 
1450         smi_msg->msgid = msgid;
1451 }
1452 
1453 static inline void format_lan_msg(struct ipmi_smi_msg   *smi_msg,
1454                                   struct kernel_ipmi_msg *msg,
1455                                   struct ipmi_lan_addr  *lan_addr,
1456                                   long                  msgid,
1457                                   unsigned char         ipmb_seq,
1458                                   unsigned char         source_lun)
1459 {
1460         /* Format the IPMB header data. */
1461         smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
1462         smi_msg->data[1] = IPMI_SEND_MSG_CMD;
1463         smi_msg->data[2] = lan_addr->channel;
1464         smi_msg->data[3] = lan_addr->session_handle;
1465         smi_msg->data[4] = lan_addr->remote_SWID;
1466         smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3);
1467         smi_msg->data[6] = ipmb_checksum(&(smi_msg->data[4]), 2);
1468         smi_msg->data[7] = lan_addr->local_SWID;
1469         smi_msg->data[8] = (ipmb_seq << 2) | source_lun;
1470         smi_msg->data[9] = msg->cmd;
1471 
1472         /* Now tack on the data to the message. */
1473         if (msg->data_len > 0)
1474                 memcpy(&(smi_msg->data[10]), msg->data,
1475                        msg->data_len);
1476         smi_msg->data_size = msg->data_len + 10;
1477 
1478         /* Now calculate the checksum and tack it on. */
1479         smi_msg->data[smi_msg->data_size]
1480                 = ipmb_checksum(&(smi_msg->data[7]),
1481                                 smi_msg->data_size-7);
1482 
1483         /*
1484          * Add on the checksum size and the offset from the
1485          * broadcast.
1486          */
1487         smi_msg->data_size += 1;
1488 
1489         smi_msg->msgid = msgid;
1490 }
1491 
1492 static struct ipmi_smi_msg *smi_add_send_msg(ipmi_smi_t intf,
1493                                              struct ipmi_smi_msg *smi_msg,
1494                                              int priority)
1495 {
1496         if (intf->curr_msg) {
1497                 if (priority > 0)
1498                         list_add_tail(&smi_msg->link, &intf->hp_xmit_msgs);
1499                 else
1500                         list_add_tail(&smi_msg->link, &intf->xmit_msgs);
1501                 smi_msg = NULL;
1502         } else {
1503                 intf->curr_msg = smi_msg;
1504         }
1505 
1506         return smi_msg;
1507 }
1508 
1509 
1510 static void smi_send(ipmi_smi_t intf, const struct ipmi_smi_handlers *handlers,
1511                      struct ipmi_smi_msg *smi_msg, int priority)
1512 {
1513         int run_to_completion = intf->run_to_completion;
1514 
1515         if (run_to_completion) {
1516                 smi_msg = smi_add_send_msg(intf, smi_msg, priority);
1517         } else {
1518                 unsigned long flags;
1519 
1520                 spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
1521                 smi_msg = smi_add_send_msg(intf, smi_msg, priority);
1522                 spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
1523         }
1524 
1525         if (smi_msg)
1526                 handlers->sender(intf->send_info, smi_msg);
1527 }
1528 
1529 /*
1530  * Separate from ipmi_request so that the user does not have to be
1531  * supplied in certain circumstances (mainly at panic time).  If
1532  * messages are supplied, they will be freed, even if an error
1533  * occurs.
1534  */
1535 static int i_ipmi_request(ipmi_user_t          user,
1536                           ipmi_smi_t           intf,
1537                           struct ipmi_addr     *addr,
1538                           long                 msgid,
1539                           struct kernel_ipmi_msg *msg,
1540                           void                 *user_msg_data,
1541                           void                 *supplied_smi,
1542                           struct ipmi_recv_msg *supplied_recv,
1543                           int                  priority,
1544                           unsigned char        source_address,
1545                           unsigned char        source_lun,
1546                           int                  retries,
1547                           unsigned int         retry_time_ms)
1548 {
1549         int                      rv = 0;
1550         struct ipmi_smi_msg      *smi_msg;
1551         struct ipmi_recv_msg     *recv_msg;
1552         unsigned long            flags;
1553 
1554 
1555         if (supplied_recv)
1556                 recv_msg = supplied_recv;
1557         else {
1558                 recv_msg = ipmi_alloc_recv_msg();
1559                 if (recv_msg == NULL)
1560                         return -ENOMEM;
1561         }
1562         recv_msg->user_msg_data = user_msg_data;
1563 
1564         if (supplied_smi)
1565                 smi_msg = (struct ipmi_smi_msg *) supplied_smi;
1566         else {
1567                 smi_msg = ipmi_alloc_smi_msg();
1568                 if (smi_msg == NULL) {
1569                         ipmi_free_recv_msg(recv_msg);
1570                         return -ENOMEM;
1571                 }
1572         }
1573 
1574         rcu_read_lock();
1575         if (intf->in_shutdown) {
1576                 rv = -ENODEV;
1577                 goto out_err;
1578         }
1579 
1580         recv_msg->user = user;
1581         if (user)
1582                 kref_get(&user->refcount);
1583         recv_msg->msgid = msgid;
1584         /*
1585          * Store the message to send in the receive message so timeout
1586          * responses can get the proper response data.
1587          */
1588         recv_msg->msg = *msg;
1589 
1590         if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
1591                 struct ipmi_system_interface_addr *smi_addr;
1592 
1593                 if (msg->netfn & 1) {
1594                         /* Responses are not allowed to the SMI. */
1595                         rv = -EINVAL;
1596                         goto out_err;
1597                 }
1598 
1599                 smi_addr = (struct ipmi_system_interface_addr *) addr;
1600                 if (smi_addr->lun > 3) {
1601                         ipmi_inc_stat(intf, sent_invalid_commands);
1602                         rv = -EINVAL;
1603                         goto out_err;
1604                 }
1605 
1606                 memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr));
1607 
1608                 if ((msg->netfn == IPMI_NETFN_APP_REQUEST)
1609                     && ((msg->cmd == IPMI_SEND_MSG_CMD)
1610                         || (msg->cmd == IPMI_GET_MSG_CMD)
1611                         || (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) {
1612                         /*
1613                          * We don't let the user do these, since we manage
1614                          * the sequence numbers.
1615                          */
1616                         ipmi_inc_stat(intf, sent_invalid_commands);
1617                         rv = -EINVAL;
1618                         goto out_err;
1619                 }
1620 
1621                 if (((msg->netfn == IPMI_NETFN_APP_REQUEST)
1622                       && ((msg->cmd == IPMI_COLD_RESET_CMD)
1623                           || (msg->cmd == IPMI_WARM_RESET_CMD)))
1624                      || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)) {
1625                         spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
1626                         intf->auto_maintenance_timeout
1627                                 = IPMI_MAINTENANCE_MODE_TIMEOUT;
1628                         if (!intf->maintenance_mode
1629                             && !intf->maintenance_mode_enable) {
1630                                 intf->maintenance_mode_enable = true;
1631                                 maintenance_mode_update(intf);
1632                         }
1633                         spin_unlock_irqrestore(&intf->maintenance_mode_lock,
1634                                                flags);
1635                 }
1636 
1637                 if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) {
1638                         ipmi_inc_stat(intf, sent_invalid_commands);
1639                         rv = -EMSGSIZE;
1640                         goto out_err;
1641                 }
1642 
1643                 smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3);
1644                 smi_msg->data[1] = msg->cmd;
1645                 smi_msg->msgid = msgid;
1646                 smi_msg->user_data = recv_msg;
1647                 if (msg->data_len > 0)
1648                         memcpy(&(smi_msg->data[2]), msg->data, msg->data_len);
1649                 smi_msg->data_size = msg->data_len + 2;
1650                 ipmi_inc_stat(intf, sent_local_commands);
1651         } else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
1652                 struct ipmi_ipmb_addr *ipmb_addr;
1653                 unsigned char         ipmb_seq;
1654                 long                  seqid;
1655                 int                   broadcast = 0;
1656 
1657                 if (addr->channel >= IPMI_MAX_CHANNELS) {
1658                         ipmi_inc_stat(intf, sent_invalid_commands);
1659                         rv = -EINVAL;
1660                         goto out_err;
1661                 }
1662 
1663                 if (intf->channels[addr->channel].medium
1664                                         != IPMI_CHANNEL_MEDIUM_IPMB) {
1665                         ipmi_inc_stat(intf, sent_invalid_commands);
1666                         rv = -EINVAL;
1667                         goto out_err;
1668                 }
1669 
1670                 if (retries < 0) {
1671                     if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)
1672                         retries = 0; /* Don't retry broadcasts. */
1673                     else
1674                         retries = 4;
1675                 }
1676                 if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) {
1677                     /*
1678                      * Broadcasts add a zero at the beginning of the
1679                      * message, but otherwise is the same as an IPMB
1680                      * address.
1681                      */
1682                     addr->addr_type = IPMI_IPMB_ADDR_TYPE;
1683                     broadcast = 1;
1684                 }
1685 
1686 
1687                 /* Default to 1 second retries. */
1688                 if (retry_time_ms == 0)
1689                     retry_time_ms = 1000;
1690 
1691                 /*
1692                  * 9 for the header and 1 for the checksum, plus
1693                  * possibly one for the broadcast.
1694                  */
1695                 if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) {
1696                         ipmi_inc_stat(intf, sent_invalid_commands);
1697                         rv = -EMSGSIZE;
1698                         goto out_err;
1699                 }
1700 
1701                 ipmb_addr = (struct ipmi_ipmb_addr *) addr;
1702                 if (ipmb_addr->lun > 3) {
1703                         ipmi_inc_stat(intf, sent_invalid_commands);
1704                         rv = -EINVAL;
1705                         goto out_err;
1706                 }
1707 
1708                 memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr));
1709 
1710                 if (recv_msg->msg.netfn & 0x1) {
1711                         /*
1712                          * It's a response, so use the user's sequence
1713                          * from msgid.
1714                          */
1715                         ipmi_inc_stat(intf, sent_ipmb_responses);
1716                         format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid,
1717                                         msgid, broadcast,
1718                                         source_address, source_lun);
1719 
1720                         /*
1721                          * Save the receive message so we can use it
1722                          * to deliver the response.
1723                          */
1724                         smi_msg->user_data = recv_msg;
1725                 } else {
1726                         /* It's a command, so get a sequence for it. */
1727 
1728                         spin_lock_irqsave(&(intf->seq_lock), flags);
1729 
1730                         /*
1731                          * Create a sequence number with a 1 second
1732                          * timeout and 4 retries.
1733                          */
1734                         rv = intf_next_seq(intf,
1735                                            recv_msg,
1736                                            retry_time_ms,
1737                                            retries,
1738                                            broadcast,
1739                                            &ipmb_seq,
1740                                            &seqid);
1741                         if (rv) {
1742                                 /*
1743                                  * We have used up all the sequence numbers,
1744                                  * probably, so abort.
1745                                  */
1746                                 spin_unlock_irqrestore(&(intf->seq_lock),
1747                                                        flags);
1748                                 goto out_err;
1749                         }
1750 
1751                         ipmi_inc_stat(intf, sent_ipmb_commands);
1752 
1753                         /*
1754                          * Store the sequence number in the message,
1755                          * so that when the send message response
1756                          * comes back we can start the timer.
1757                          */
1758                         format_ipmb_msg(smi_msg, msg, ipmb_addr,
1759                                         STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
1760                                         ipmb_seq, broadcast,
1761                                         source_address, source_lun);
1762 
1763                         /*
1764                          * Copy the message into the recv message data, so we
1765                          * can retransmit it later if necessary.
1766                          */
1767                         memcpy(recv_msg->msg_data, smi_msg->data,
1768                                smi_msg->data_size);
1769                         recv_msg->msg.data = recv_msg->msg_data;
1770                         recv_msg->msg.data_len = smi_msg->data_size;
1771 
1772                         /*
1773                          * We don't unlock until here, because we need
1774                          * to copy the completed message into the
1775                          * recv_msg before we release the lock.
1776                          * Otherwise, race conditions may bite us.  I
1777                          * know that's pretty paranoid, but I prefer
1778                          * to be correct.
1779                          */
1780                         spin_unlock_irqrestore(&(intf->seq_lock), flags);
1781                 }
1782         } else if (is_lan_addr(addr)) {
1783                 struct ipmi_lan_addr  *lan_addr;
1784                 unsigned char         ipmb_seq;
1785                 long                  seqid;
1786 
1787                 if (addr->channel >= IPMI_MAX_CHANNELS) {
1788                         ipmi_inc_stat(intf, sent_invalid_commands);
1789                         rv = -EINVAL;
1790                         goto out_err;
1791                 }
1792 
1793                 if ((intf->channels[addr->channel].medium
1794                                 != IPMI_CHANNEL_MEDIUM_8023LAN)
1795                     && (intf->channels[addr->channel].medium
1796                                 != IPMI_CHANNEL_MEDIUM_ASYNC)) {
1797                         ipmi_inc_stat(intf, sent_invalid_commands);
1798                         rv = -EINVAL;
1799                         goto out_err;
1800                 }
1801 
1802                 retries = 4;
1803 
1804                 /* Default to 1 second retries. */
1805                 if (retry_time_ms == 0)
1806                     retry_time_ms = 1000;
1807 
1808                 /* 11 for the header and 1 for the checksum. */
1809                 if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) {
1810                         ipmi_inc_stat(intf, sent_invalid_commands);
1811                         rv = -EMSGSIZE;
1812                         goto out_err;
1813                 }
1814 
1815                 lan_addr = (struct ipmi_lan_addr *) addr;
1816                 if (lan_addr->lun > 3) {
1817                         ipmi_inc_stat(intf, sent_invalid_commands);
1818                         rv = -EINVAL;
1819                         goto out_err;
1820                 }
1821 
1822                 memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr));
1823 
1824                 if (recv_msg->msg.netfn & 0x1) {
1825                         /*
1826                          * It's a response, so use the user's sequence
1827                          * from msgid.
1828                          */
1829                         ipmi_inc_stat(intf, sent_lan_responses);
1830                         format_lan_msg(smi_msg, msg, lan_addr, msgid,
1831                                        msgid, source_lun);
1832 
1833                         /*
1834                          * Save the receive message so we can use it
1835                          * to deliver the response.
1836                          */
1837                         smi_msg->user_data = recv_msg;
1838                 } else {
1839                         /* It's a command, so get a sequence for it. */
1840 
1841                         spin_lock_irqsave(&(intf->seq_lock), flags);
1842 
1843                         /*
1844                          * Create a sequence number with a 1 second
1845                          * timeout and 4 retries.
1846                          */
1847                         rv = intf_next_seq(intf,
1848                                            recv_msg,
1849                                            retry_time_ms,
1850                                            retries,
1851                                            0,
1852                                            &ipmb_seq,
1853                                            &seqid);
1854                         if (rv) {
1855                                 /*
1856                                  * We have used up all the sequence numbers,
1857                                  * probably, so abort.
1858                                  */
1859                                 spin_unlock_irqrestore(&(intf->seq_lock),
1860                                                        flags);
1861                                 goto out_err;
1862                         }
1863 
1864                         ipmi_inc_stat(intf, sent_lan_commands);
1865 
1866                         /*
1867                          * Store the sequence number in the message,
1868                          * so that when the send message response
1869                          * comes back we can start the timer.
1870                          */
1871                         format_lan_msg(smi_msg, msg, lan_addr,
1872                                        STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
1873                                        ipmb_seq, source_lun);
1874 
1875                         /*
1876                          * Copy the message into the recv message data, so we
1877                          * can retransmit it later if necessary.
1878                          */
1879                         memcpy(recv_msg->msg_data, smi_msg->data,
1880                                smi_msg->data_size);
1881                         recv_msg->msg.data = recv_msg->msg_data;
1882                         recv_msg->msg.data_len = smi_msg->data_size;
1883 
1884                         /*
1885                          * We don't unlock until here, because we need
1886                          * to copy the completed message into the
1887                          * recv_msg before we release the lock.
1888                          * Otherwise, race conditions may bite us.  I
1889                          * know that's pretty paranoid, but I prefer
1890                          * to be correct.
1891                          */
1892                         spin_unlock_irqrestore(&(intf->seq_lock), flags);
1893                 }
1894         } else {
1895             /* Unknown address type. */
1896                 ipmi_inc_stat(intf, sent_invalid_commands);
1897                 rv = -EINVAL;
1898                 goto out_err;
1899         }
1900 
1901 #ifdef DEBUG_MSGING
1902         {
1903                 int m;
1904                 for (m = 0; m < smi_msg->data_size; m++)
1905                         printk(" %2.2x", smi_msg->data[m]);
1906                 printk("\n");
1907         }
1908 #endif
1909 
1910         smi_send(intf, intf->handlers, smi_msg, priority);
1911         rcu_read_unlock();
1912 
1913         return 0;
1914 
1915  out_err:
1916         rcu_read_unlock();
1917         ipmi_free_smi_msg(smi_msg);
1918         ipmi_free_recv_msg(recv_msg);
1919         return rv;
1920 }
1921 
1922 static int check_addr(ipmi_smi_t       intf,
1923                       struct ipmi_addr *addr,
1924                       unsigned char    *saddr,
1925                       unsigned char    *lun)
1926 {
1927         if (addr->channel >= IPMI_MAX_CHANNELS)
1928                 return -EINVAL;
1929         *lun = intf->channels[addr->channel].lun;
1930         *saddr = intf->channels[addr->channel].address;
1931         return 0;
1932 }
1933 
1934 int ipmi_request_settime(ipmi_user_t      user,
1935                          struct ipmi_addr *addr,
1936                          long             msgid,
1937                          struct kernel_ipmi_msg  *msg,
1938                          void             *user_msg_data,
1939                          int              priority,
1940                          int              retries,
1941                          unsigned int     retry_time_ms)
1942 {
1943         unsigned char saddr = 0, lun = 0;
1944         int           rv;
1945 
1946         if (!user)
1947                 return -EINVAL;
1948         rv = check_addr(user->intf, addr, &saddr, &lun);
1949         if (rv)
1950                 return rv;
1951         return i_ipmi_request(user,
1952                               user->intf,
1953                               addr,
1954                               msgid,
1955                               msg,
1956                               user_msg_data,
1957                               NULL, NULL,
1958                               priority,
1959                               saddr,
1960                               lun,
1961                               retries,
1962                               retry_time_ms);
1963 }
1964 EXPORT_SYMBOL(ipmi_request_settime);
1965 
1966 int ipmi_request_supply_msgs(ipmi_user_t          user,
1967                              struct ipmi_addr     *addr,
1968                              long                 msgid,
1969                              struct kernel_ipmi_msg *msg,
1970                              void                 *user_msg_data,
1971                              void                 *supplied_smi,
1972                              struct ipmi_recv_msg *supplied_recv,
1973                              int                  priority)
1974 {
1975         unsigned char saddr = 0, lun = 0;
1976         int           rv;
1977 
1978         if (!user)
1979                 return -EINVAL;
1980         rv = check_addr(user->intf, addr, &saddr, &lun);
1981         if (rv)
1982                 return rv;
1983         return i_ipmi_request(user,
1984                               user->intf,
1985                               addr,
1986                               msgid,
1987                               msg,
1988                               user_msg_data,
1989                               supplied_smi,
1990                               supplied_recv,
1991                               priority,
1992                               saddr,
1993                               lun,
1994                               -1, 0);
1995 }
1996 EXPORT_SYMBOL(ipmi_request_supply_msgs);
1997 
1998 #ifdef CONFIG_PROC_FS
1999 static int smi_ipmb_proc_show(struct seq_file *m, void *v)
2000 {
2001         ipmi_smi_t intf = m->private;
2002         int        i;
2003 
2004         seq_printf(m, "%x", intf->channels[0].address);
2005         for (i = 1; i < IPMI_MAX_CHANNELS; i++)
2006                 seq_printf(m, " %x", intf->channels[i].address);
2007         seq_putc(m, '\n');
2008 
2009         return 0;
2010 }
2011 
2012 static int smi_ipmb_proc_open(struct inode *inode, struct file *file)
2013 {
2014         return single_open(file, smi_ipmb_proc_show, PDE_DATA(inode));
2015 }
2016 
2017 static const struct file_operations smi_ipmb_proc_ops = {
2018         .open           = smi_ipmb_proc_open,
2019         .read           = seq_read,
2020         .llseek         = seq_lseek,
2021         .release        = single_release,
2022 };
2023 
2024 static int smi_version_proc_show(struct seq_file *m, void *v)
2025 {
2026         ipmi_smi_t intf = m->private;
2027 
2028         seq_printf(m, "%u.%u\n",
2029                    ipmi_version_major(&intf->bmc->id),
2030                    ipmi_version_minor(&intf->bmc->id));
2031 
2032         return 0;
2033 }
2034 
2035 static int smi_version_proc_open(struct inode *inode, struct file *file)
2036 {
2037         return single_open(file, smi_version_proc_show, PDE_DATA(inode));
2038 }
2039 
2040 static const struct file_operations smi_version_proc_ops = {
2041         .open           = smi_version_proc_open,
2042         .read           = seq_read,
2043         .llseek         = seq_lseek,
2044         .release        = single_release,
2045 };
2046 
2047 static int smi_stats_proc_show(struct seq_file *m, void *v)
2048 {
2049         ipmi_smi_t intf = m->private;
2050 
2051         seq_printf(m, "sent_invalid_commands:       %u\n",
2052                        ipmi_get_stat(intf, sent_invalid_commands));
2053         seq_printf(m, "sent_local_commands:         %u\n",
2054                        ipmi_get_stat(intf, sent_local_commands));
2055         seq_printf(m, "handled_local_responses:     %u\n",
2056                        ipmi_get_stat(intf, handled_local_responses));
2057         seq_printf(m, "unhandled_local_responses:   %u\n",
2058                        ipmi_get_stat(intf, unhandled_local_responses));
2059         seq_printf(m, "sent_ipmb_commands:          %u\n",
2060                        ipmi_get_stat(intf, sent_ipmb_commands));
2061         seq_printf(m, "sent_ipmb_command_errs:      %u\n",
2062                        ipmi_get_stat(intf, sent_ipmb_command_errs));
2063         seq_printf(m, "retransmitted_ipmb_commands: %u\n",
2064                        ipmi_get_stat(intf, retransmitted_ipmb_commands));
2065         seq_printf(m, "timed_out_ipmb_commands:     %u\n",
2066                        ipmi_get_stat(intf, timed_out_ipmb_commands));
2067         seq_printf(m, "timed_out_ipmb_broadcasts:   %u\n",
2068                        ipmi_get_stat(intf, timed_out_ipmb_broadcasts));
2069         seq_printf(m, "sent_ipmb_responses:         %u\n",
2070                        ipmi_get_stat(intf, sent_ipmb_responses));
2071         seq_printf(m, "handled_ipmb_responses:      %u\n",
2072                        ipmi_get_stat(intf, handled_ipmb_responses));
2073         seq_printf(m, "invalid_ipmb_responses:      %u\n",
2074                        ipmi_get_stat(intf, invalid_ipmb_responses));
2075         seq_printf(m, "unhandled_ipmb_responses:    %u\n",
2076                        ipmi_get_stat(intf, unhandled_ipmb_responses));
2077         seq_printf(m, "sent_lan_commands:           %u\n",
2078                        ipmi_get_stat(intf, sent_lan_commands));
2079         seq_printf(m, "sent_lan_command_errs:       %u\n",
2080                        ipmi_get_stat(intf, sent_lan_command_errs));
2081         seq_printf(m, "retransmitted_lan_commands:  %u\n",
2082                        ipmi_get_stat(intf, retransmitted_lan_commands));
2083         seq_printf(m, "timed_out_lan_commands:      %u\n",
2084                        ipmi_get_stat(intf, timed_out_lan_commands));
2085         seq_printf(m, "sent_lan_responses:          %u\n",
2086                        ipmi_get_stat(intf, sent_lan_responses));
2087         seq_printf(m, "handled_lan_responses:       %u\n",
2088                        ipmi_get_stat(intf, handled_lan_responses));
2089         seq_printf(m, "invalid_lan_responses:       %u\n",
2090                        ipmi_get_stat(intf, invalid_lan_responses));
2091         seq_printf(m, "unhandled_lan_responses:     %u\n",
2092                        ipmi_get_stat(intf, unhandled_lan_responses));
2093         seq_printf(m, "handled_commands:            %u\n",
2094                        ipmi_get_stat(intf, handled_commands));
2095         seq_printf(m, "invalid_commands:            %u\n",
2096                        ipmi_get_stat(intf, invalid_commands));
2097         seq_printf(m, "unhandled_commands:          %u\n",
2098                        ipmi_get_stat(intf, unhandled_commands));
2099         seq_printf(m, "invalid_events:              %u\n",
2100                        ipmi_get_stat(intf, invalid_events));
2101         seq_printf(m, "events:                      %u\n",
2102                        ipmi_get_stat(intf, events));
2103         seq_printf(m, "failed rexmit LAN msgs:      %u\n",
2104                        ipmi_get_stat(intf, dropped_rexmit_lan_commands));
2105         seq_printf(m, "failed rexmit IPMB msgs:     %u\n",
2106                        ipmi_get_stat(intf, dropped_rexmit_ipmb_commands));
2107         return 0;
2108 }
2109 
2110 static int smi_stats_proc_open(struct inode *inode, struct file *file)
2111 {
2112         return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
2113 }
2114 
2115 static const struct file_operations smi_stats_proc_ops = {
2116         .open           = smi_stats_proc_open,
2117         .read           = seq_read,
2118         .llseek         = seq_lseek,
2119         .release        = single_release,
2120 };
2121 #endif /* CONFIG_PROC_FS */
2122 
2123 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
2124                             const struct file_operations *proc_ops,
2125                             void *data)
2126 {
2127         int                    rv = 0;
2128 #ifdef CONFIG_PROC_FS
2129         struct proc_dir_entry  *file;
2130         struct ipmi_proc_entry *entry;
2131 
2132         /* Create a list element. */
2133         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
2134         if (!entry)
2135                 return -ENOMEM;
2136         entry->name = kstrdup(name, GFP_KERNEL);
2137         if (!entry->name) {
2138                 kfree(entry);
2139                 return -ENOMEM;
2140         }
2141 
2142         file = proc_create_data(name, 0, smi->proc_dir, proc_ops, data);
2143         if (!file) {
2144                 kfree(entry->name);
2145                 kfree(entry);
2146                 rv = -ENOMEM;
2147         } else {
2148                 mutex_lock(&smi->proc_entry_lock);
2149                 /* Stick it on the list. */
2150                 entry->next = smi->proc_entries;
2151                 smi->proc_entries = entry;
2152                 mutex_unlock(&smi->proc_entry_lock);
2153         }
2154 #endif /* CONFIG_PROC_FS */
2155 
2156         return rv;
2157 }
2158 EXPORT_SYMBOL(ipmi_smi_add_proc_entry);
2159 
2160 static int add_proc_entries(ipmi_smi_t smi, int num)
2161 {
2162         int rv = 0;
2163 
2164 #ifdef CONFIG_PROC_FS
2165         sprintf(smi->proc_dir_name, "%d", num);
2166         smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
2167         if (!smi->proc_dir)
2168                 rv = -ENOMEM;
2169 
2170         if (rv == 0)
2171                 rv = ipmi_smi_add_proc_entry(smi, "stats",
2172                                              &smi_stats_proc_ops,
2173                                              smi);
2174 
2175         if (rv == 0)
2176                 rv = ipmi_smi_add_proc_entry(smi, "ipmb",
2177                                              &smi_ipmb_proc_ops,
2178                                              smi);
2179 
2180         if (rv == 0)
2181                 rv = ipmi_smi_add_proc_entry(smi, "version",
2182                                              &smi_version_proc_ops,
2183                                              smi);
2184 #endif /* CONFIG_PROC_FS */
2185 
2186         return rv;
2187 }
2188 
2189 static void remove_proc_entries(ipmi_smi_t smi)
2190 {
2191 #ifdef CONFIG_PROC_FS
2192         struct ipmi_proc_entry *entry;
2193 
2194         mutex_lock(&smi->proc_entry_lock);
2195         while (smi->proc_entries) {
2196                 entry = smi->proc_entries;
2197                 smi->proc_entries = entry->next;
2198 
2199                 remove_proc_entry(entry->name, smi->proc_dir);
2200                 kfree(entry->name);
2201                 kfree(entry);
2202         }
2203         mutex_unlock(&smi->proc_entry_lock);
2204         remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
2205 #endif /* CONFIG_PROC_FS */
2206 }
2207 
2208 static int __find_bmc_guid(struct device *dev, void *data)
2209 {
2210         unsigned char *id = data;
2211         struct bmc_device *bmc = to_bmc_device(dev);
2212         return memcmp(bmc->guid, id, 16) == 0;
2213 }
2214 
2215 static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
2216                                              unsigned char *guid)
2217 {
2218         struct device *dev;
2219 
2220         dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
2221         if (dev)
2222                 return to_bmc_device(dev);
2223         else
2224                 return NULL;
2225 }
2226 
2227 struct prod_dev_id {
2228         unsigned int  product_id;
2229         unsigned char device_id;
2230 };
2231 
2232 static int __find_bmc_prod_dev_id(struct device *dev, void *data)
2233 {
2234         struct prod_dev_id *id = data;
2235         struct bmc_device *bmc = to_bmc_device(dev);
2236 
2237         return (bmc->id.product_id == id->product_id
2238                 && bmc->id.device_id == id->device_id);
2239 }
2240 
2241 static struct bmc_device *ipmi_find_bmc_prod_dev_id(
2242         struct device_driver *drv,
2243         unsigned int product_id, unsigned char device_id)
2244 {
2245         struct prod_dev_id id = {
2246                 .product_id = product_id,
2247                 .device_id = device_id,
2248         };
2249         struct device *dev;
2250 
2251         dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
2252         if (dev)
2253                 return to_bmc_device(dev);
2254         else
2255                 return NULL;
2256 }
2257 
2258 static ssize_t device_id_show(struct device *dev,
2259                               struct device_attribute *attr,
2260                               char *buf)
2261 {
2262         struct bmc_device *bmc = to_bmc_device(dev);
2263 
2264         return snprintf(buf, 10, "%u\n", bmc->id.device_id);
2265 }
2266 static DEVICE_ATTR(device_id, S_IRUGO, device_id_show, NULL);
2267 
2268 static ssize_t provides_device_sdrs_show(struct device *dev,
2269                                          struct device_attribute *attr,
2270                                          char *buf)
2271 {
2272         struct bmc_device *bmc = to_bmc_device(dev);
2273 
2274         return snprintf(buf, 10, "%u\n",
2275                         (bmc->id.device_revision & 0x80) >> 7);
2276 }
2277 static DEVICE_ATTR(provides_device_sdrs, S_IRUGO, provides_device_sdrs_show,
2278                    NULL);
2279 
2280 static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
2281                              char *buf)
2282 {
2283         struct bmc_device *bmc = to_bmc_device(dev);
2284 
2285         return snprintf(buf, 20, "%u\n",
2286                         bmc->id.device_revision & 0x0F);
2287 }
2288 static DEVICE_ATTR(revision, S_IRUGO, revision_show, NULL);
2289 
2290 static ssize_t firmware_revision_show(struct device *dev,
2291                                       struct device_attribute *attr,
2292                                       char *buf)
2293 {
2294         struct bmc_device *bmc = to_bmc_device(dev);
2295 
2296         return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1,
2297                         bmc->id.firmware_revision_2);
2298 }
2299 static DEVICE_ATTR(firmware_revision, S_IRUGO, firmware_revision_show, NULL);
2300 
2301 static ssize_t ipmi_version_show(struct device *dev,
2302                                  struct device_attribute *attr,
2303                                  char *buf)
2304 {
2305         struct bmc_device *bmc = to_bmc_device(dev);
2306 
2307         return snprintf(buf, 20, "%u.%u\n",
2308                         ipmi_version_major(&bmc->id),
2309                         ipmi_version_minor(&bmc->id));
2310 }
2311 static DEVICE_ATTR(ipmi_version, S_IRUGO, ipmi_version_show, NULL);
2312 
2313 static ssize_t add_dev_support_show(struct device *dev,
2314                                     struct device_attribute *attr,
2315                                     char *buf)
2316 {
2317         struct bmc_device *bmc = to_bmc_device(dev);
2318 
2319         return snprintf(buf, 10, "0x%02x\n",
2320                         bmc->id.additional_device_support);
2321 }
2322 static DEVICE_ATTR(additional_device_support, S_IRUGO, add_dev_support_show,
2323                    NULL);
2324 
2325 static ssize_t manufacturer_id_show(struct device *dev,
2326                                     struct device_attribute *attr,
2327                                     char *buf)
2328 {
2329         struct bmc_device *bmc = to_bmc_device(dev);
2330 
2331         return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id);
2332 }
2333 static DEVICE_ATTR(manufacturer_id, S_IRUGO, manufacturer_id_show, NULL);
2334 
2335 static ssize_t product_id_show(struct device *dev,
2336                                struct device_attribute *attr,
2337                                char *buf)
2338 {
2339         struct bmc_device *bmc = to_bmc_device(dev);
2340 
2341         return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id);
2342 }
2343 static DEVICE_ATTR(product_id, S_IRUGO, product_id_show, NULL);
2344 
2345 static ssize_t aux_firmware_rev_show(struct device *dev,
2346                                      struct device_attribute *attr,
2347                                      char *buf)
2348 {
2349         struct bmc_device *bmc = to_bmc_device(dev);
2350 
2351         return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
2352                         bmc->id.aux_firmware_revision[3],
2353                         bmc->id.aux_firmware_revision[2],
2354                         bmc->id.aux_firmware_revision[1],
2355                         bmc->id.aux_firmware_revision[0]);
2356 }
2357 static DEVICE_ATTR(aux_firmware_revision, S_IRUGO, aux_firmware_rev_show, NULL);
2358 
2359 static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
2360                          char *buf)
2361 {
2362         struct bmc_device *bmc = to_bmc_device(dev);
2363 
2364         return snprintf(buf, 100, "%Lx%Lx\n",
2365                         (long long) bmc->guid[0],
2366                         (long long) bmc->guid[8]);
2367 }
2368 static DEVICE_ATTR(guid, S_IRUGO, guid_show, NULL);
2369 
2370 static struct attribute *bmc_dev_attrs[] = {
2371         &dev_attr_device_id.attr,
2372         &dev_attr_provides_device_sdrs.attr,
2373         &dev_attr_revision.attr,
2374         &dev_attr_firmware_revision.attr,
2375         &dev_attr_ipmi_version.attr,
2376         &dev_attr_additional_device_support.attr,
2377         &dev_attr_manufacturer_id.attr,
2378         &dev_attr_product_id.attr,
2379         &dev_attr_aux_firmware_revision.attr,
2380         &dev_attr_guid.attr,
2381         NULL
2382 };
2383 
2384 static umode_t bmc_dev_attr_is_visible(struct kobject *kobj,
2385                                        struct attribute *attr, int idx)
2386 {
2387         struct device *dev = kobj_to_dev(kobj);
2388         struct bmc_device *bmc = to_bmc_device(dev);
2389         umode_t mode = attr->mode;
2390 
2391         if (attr == &dev_attr_aux_firmware_revision.attr)
2392                 return bmc->id.aux_firmware_revision_set ? mode : 0;
2393         if (attr == &dev_attr_guid.attr)
2394                 return bmc->guid_set ? mode : 0;
2395         return mode;
2396 }
2397 
2398 static struct attribute_group bmc_dev_attr_group = {
2399         .attrs          = bmc_dev_attrs,
2400         .is_visible     = bmc_dev_attr_is_visible,
2401 };
2402 
2403 static const struct attribute_group *bmc_dev_attr_groups[] = {
2404         &bmc_dev_attr_group,
2405         NULL
2406 };
2407 
2408 static struct device_type bmc_device_type = {
2409         .groups         = bmc_dev_attr_groups,
2410 };
2411 
2412 static void
2413 release_bmc_device(struct device *dev)
2414 {
2415         kfree(to_bmc_device(dev));
2416 }
2417 
2418 static void
2419 cleanup_bmc_device(struct kref *ref)
2420 {
2421         struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount);
2422 
2423         platform_device_unregister(&bmc->pdev);
2424 }
2425 
2426 static void ipmi_bmc_unregister(ipmi_smi_t intf)
2427 {
2428         struct bmc_device *bmc = intf->bmc;
2429 
2430         sysfs_remove_link(&intf->si_dev->kobj, "bmc");
2431         if (intf->my_dev_name) {
2432                 sysfs_remove_link(&bmc->pdev.dev.kobj, intf->my_dev_name);
2433                 kfree(intf->my_dev_name);
2434                 intf->my_dev_name = NULL;
2435         }
2436 
2437         mutex_lock(&ipmidriver_mutex);
2438         kref_put(&bmc->usecount, cleanup_bmc_device);
2439         intf->bmc = NULL;
2440         mutex_unlock(&ipmidriver_mutex);
2441 }
2442 
2443 static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
2444 {
2445         int               rv;
2446         struct bmc_device *bmc = intf->bmc;
2447         struct bmc_device *old_bmc;
2448 
2449         mutex_lock(&ipmidriver_mutex);
2450 
2451         /*
2452          * Try to find if there is an bmc_device struct
2453          * representing the interfaced BMC already
2454          */
2455         if (bmc->guid_set)
2456                 old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, bmc->guid);
2457         else
2458                 old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
2459                                                     bmc->id.product_id,
2460                                                     bmc->id.device_id);
2461 
2462         /*
2463          * If there is already an bmc_device, free the new one,
2464          * otherwise register the new BMC device
2465          */
2466         if (old_bmc) {
2467                 kfree(bmc);
2468                 intf->bmc = old_bmc;
2469                 bmc = old_bmc;
2470 
2471                 kref_get(&bmc->usecount);
2472                 mutex_unlock(&ipmidriver_mutex);
2473 
2474                 printk(KERN_INFO
2475                        "ipmi: interfacing existing BMC (man_id: 0x%6.6x,"
2476                        " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
2477                        bmc->id.manufacturer_id,
2478                        bmc->id.product_id,
2479                        bmc->id.device_id);
2480         } else {
2481                 unsigned char orig_dev_id = bmc->id.device_id;
2482                 int warn_printed = 0;
2483 
2484                 snprintf(bmc->name, sizeof(bmc->name),
2485                          "ipmi_bmc.%4.4x", bmc->id.product_id);
2486                 bmc->pdev.name = bmc->name;
2487 
2488                 while (ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
2489                                                  bmc->id.product_id,
2490                                                  bmc->id.device_id)) {
2491                         if (!warn_printed) {
2492                                 printk(KERN_WARNING PFX
2493                                        "This machine has two different BMCs"
2494                                        " with the same product id and device"
2495                                        " id.  This is an error in the"
2496                                        " firmware, but incrementing the"
2497                                        " device id to work around the problem."
2498                                        " Prod ID = 0x%x, Dev ID = 0x%x\n",
2499                                        bmc->id.product_id, bmc->id.device_id);
2500                                 warn_printed = 1;
2501                         }
2502                         bmc->id.device_id++; /* Wraps at 255 */
2503                         if (bmc->id.device_id == orig_dev_id) {
2504                                 printk(KERN_ERR PFX
2505                                        "Out of device ids!\n");
2506                                 break;
2507                         }
2508                 }
2509 
2510                 bmc->pdev.dev.driver = &ipmidriver.driver;
2511                 bmc->pdev.id = bmc->id.device_id;
2512                 bmc->pdev.dev.release = release_bmc_device;
2513                 bmc->pdev.dev.type = &bmc_device_type;
2514                 kref_init(&bmc->usecount);
2515 
2516                 rv = platform_device_register(&bmc->pdev);
2517                 mutex_unlock(&ipmidriver_mutex);
2518                 if (rv) {
2519                         put_device(&bmc->pdev.dev);
2520                         printk(KERN_ERR
2521                                "ipmi_msghandler:"
2522                                " Unable to register bmc device: %d\n",
2523                                rv);
2524                         /*
2525                          * Don't go to out_err, you can only do that if
2526                          * the device is registered already.
2527                          */
2528                         return rv;
2529                 }
2530 
2531                 dev_info(intf->si_dev, "Found new BMC (man_id: 0x%6.6x, "
2532                          "prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
2533                          bmc->id.manufacturer_id,
2534                          bmc->id.product_id,
2535                          bmc->id.device_id);
2536         }
2537 
2538         /*
2539          * create symlink from system interface device to bmc device
2540          * and back.
2541          */
2542         rv = sysfs_create_link(&intf->si_dev->kobj, &bmc->pdev.dev.kobj, "bmc");
2543         if (rv) {
2544                 printk(KERN_ERR
2545                        "ipmi_msghandler: Unable to create bmc symlink: %d\n",
2546                        rv);
2547                 goto out_err;
2548         }
2549 
2550         intf->my_dev_name = kasprintf(GFP_KERNEL, "ipmi%d", ifnum);
2551         if (!intf->my_dev_name) {
2552                 rv = -ENOMEM;
2553                 printk(KERN_ERR
2554                        "ipmi_msghandler: allocate link from BMC: %d\n",
2555                        rv);
2556                 goto out_err;
2557         }
2558 
2559         rv = sysfs_create_link(&bmc->pdev.dev.kobj, &intf->si_dev->kobj,
2560                                intf->my_dev_name);
2561         if (rv) {
2562                 kfree(intf->my_dev_name);
2563                 intf->my_dev_name = NULL;
2564                 printk(KERN_ERR
2565                        "ipmi_msghandler:"
2566                        " Unable to create symlink to bmc: %d\n",
2567                        rv);
2568                 goto out_err;
2569         }
2570 
2571         return 0;
2572 
2573 out_err:
2574         ipmi_bmc_unregister(intf);
2575         return rv;
2576 }
2577 
2578 static int
2579 send_guid_cmd(ipmi_smi_t intf, int chan)
2580 {
2581         struct kernel_ipmi_msg            msg;
2582         struct ipmi_system_interface_addr si;
2583 
2584         si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
2585         si.channel = IPMI_BMC_CHANNEL;
2586         si.lun = 0;
2587 
2588         msg.netfn = IPMI_NETFN_APP_REQUEST;
2589         msg.cmd = IPMI_GET_DEVICE_GUID_CMD;
2590         msg.data = NULL;
2591         msg.data_len = 0;
2592         return i_ipmi_request(NULL,
2593                               intf,
2594                               (struct ipmi_addr *) &si,
2595                               0,
2596                               &msg,
2597                               intf,
2598                               NULL,
2599                               NULL,
2600                               0,
2601                               intf->channels[0].address,
2602                               intf->channels[0].lun,
2603                               -1, 0);
2604 }
2605 
2606 static void
2607 guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
2608 {
2609         if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
2610             || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
2611             || (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD))
2612                 /* Not for me */
2613                 return;
2614 
2615         if (msg->msg.data[0] != 0) {
2616                 /* Error from getting the GUID, the BMC doesn't have one. */
2617                 intf->bmc->guid_set = 0;
2618                 goto out;
2619         }
2620 
2621         if (msg->msg.data_len < 17) {
2622                 intf->bmc->guid_set = 0;
2623                 printk(KERN_WARNING PFX
2624                        "guid_handler: The GUID response from the BMC was too"
2625                        " short, it was %d but should have been 17.  Assuming"
2626                        " GUID is not available.\n",
2627                        msg->msg.data_len);
2628                 goto out;
2629         }
2630 
2631         memcpy(intf->bmc->guid, msg->msg.data, 16);
2632         intf->bmc->guid_set = 1;
2633  out:
2634         wake_up(&intf->waitq);
2635 }
2636 
2637 static void
2638 get_guid(ipmi_smi_t intf)
2639 {
2640         int rv;
2641 
2642         intf->bmc->guid_set = 0x2;
2643         intf->null_user_handler = guid_handler;
2644         rv = send_guid_cmd(intf, 0);
2645         if (rv)
2646                 /* Send failed, no GUID available. */
2647                 intf->bmc->guid_set = 0;
2648         wait_event(intf->waitq, intf->bmc->guid_set != 2);
2649         intf->null_user_handler = NULL;
2650 }
2651 
2652 static int
2653 send_channel_info_cmd(ipmi_smi_t intf, int chan)
2654 {
2655         struct kernel_ipmi_msg            msg;
2656         unsigned char                     data[1];
2657         struct ipmi_system_interface_addr si;
2658 
2659         si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
2660         si.channel = IPMI_BMC_CHANNEL;
2661         si.lun = 0;
2662 
2663         msg.netfn = IPMI_NETFN_APP_REQUEST;
2664         msg.cmd = IPMI_GET_CHANNEL_INFO_CMD;
2665         msg.data = data;
2666         msg.data_len = 1;
2667         data[0] = chan;
2668         return i_ipmi_request(NULL,
2669                               intf,
2670                               (struct ipmi_addr *) &si,
2671                               0,
2672                               &msg,
2673                               intf,
2674                               NULL,
2675                               NULL,
2676                               0,
2677                               intf->channels[0].address,
2678                               intf->channels[0].lun,
2679                               -1, 0);
2680 }
2681 
2682 static void
2683 channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
2684 {
2685         int rv = 0;
2686         int chan;
2687 
2688         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
2689             && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
2690             && (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD)) {
2691                 /* It's the one we want */
2692                 if (msg->msg.data[0] != 0) {
2693                         /* Got an error from the channel, just go on. */
2694 
2695                         if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
2696                                 /*
2697                                  * If the MC does not support this
2698                                  * command, that is legal.  We just
2699                                  * assume it has one IPMB at channel
2700                                  * zero.
2701                                  */
2702                                 intf->channels[0].medium
2703                                         = IPMI_CHANNEL_MEDIUM_IPMB;
2704                                 intf->channels[0].protocol
2705                                         = IPMI_CHANNEL_PROTOCOL_IPMB;
2706 
2707                                 intf->curr_channel = IPMI_MAX_CHANNELS;
2708                                 wake_up(&intf->waitq);
2709                                 goto out;
2710                         }
2711                         goto next_channel;
2712                 }
2713                 if (msg->msg.data_len < 4) {
2714                         /* Message not big enough, just go on. */
2715                         goto next_channel;
2716                 }
2717                 chan = intf->curr_channel;
2718                 intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
2719                 intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;
2720 
2721  next_channel:
2722                 intf->curr_channel++;
2723                 if (intf->curr_channel >= IPMI_MAX_CHANNELS)
2724                         wake_up(&intf->waitq);
2725                 else
2726                         rv = send_channel_info_cmd(intf, intf->curr_channel);
2727 
2728                 if (rv) {
2729                         /* Got an error somehow, just give up. */
2730                         printk(KERN_WARNING PFX
2731                                "Error sending channel information for channel"
2732                                " %d: %d\n", intf->curr_channel, rv);
2733 
2734                         intf->curr_channel = IPMI_MAX_CHANNELS;
2735                         wake_up(&intf->waitq);
2736                 }
2737         }
2738  out:
2739         return;
2740 }
2741 
2742 static void ipmi_poll(ipmi_smi_t intf)
2743 {
2744         if (intf->handlers->poll)
2745                 intf->handlers->poll(intf->send_info);
2746         /* In case something came in */
2747         handle_new_recv_msgs(intf);
2748 }
2749 
2750 void ipmi_poll_interface(ipmi_user_t user)
2751 {
2752         ipmi_poll(user->intf);
2753 }
2754 EXPORT_SYMBOL(ipmi_poll_interface);
2755 
2756 int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
2757                       void                     *send_info,
2758                       struct ipmi_device_id    *device_id,
2759                       struct device            *si_dev,
2760                       unsigned char            slave_addr)
2761 {
2762         int              i, j;
2763         int              rv;
2764         ipmi_smi_t       intf;
2765         ipmi_smi_t       tintf;
2766         struct list_head *link;
2767 
2768         /*
2769          * Make sure the driver is actually initialized, this handles
2770          * problems with initialization order.
2771          */
2772         if (!initialized) {
2773                 rv = ipmi_init_msghandler();
2774                 if (rv)
2775                         return rv;
2776                 /*
2777                  * The init code doesn't return an error if it was turned
2778                  * off, but it won't initialize.  Check that.
2779                  */
2780                 if (!initialized)
2781                         return -ENODEV;
2782         }
2783 
2784         intf = kzalloc(sizeof(*intf), GFP_KERNEL);
2785         if (!intf)
2786                 return -ENOMEM;
2787 
2788         intf->ipmi_version_major = ipmi_version_major(device_id);
2789         intf->ipmi_version_minor = ipmi_version_minor(device_id);
2790 
2791         intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
2792         if (!intf->bmc) {
2793                 kfree(intf);
2794                 return -ENOMEM;
2795         }
2796         intf->intf_num = -1; /* Mark it invalid for now. */
2797         kref_init(&intf->refcount);
2798         intf->bmc->id = *device_id;
2799         intf->si_dev = si_dev;
2800         for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
2801                 intf->channels[j].address = IPMI_BMC_SLAVE_ADDR;
2802                 intf->channels[j].lun = 2;
2803         }
2804         if (slave_addr != 0)
2805                 intf->channels[0].address = slave_addr;
2806         INIT_LIST_HEAD(&intf->users);
2807         intf->handlers = handlers;
2808         intf->send_info = send_info;
2809         spin_lock_init(&intf->seq_lock);
2810         for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) {
2811                 intf->seq_table[j].inuse = 0;
2812                 intf->seq_table[j].seqid = 0;
2813         }
2814         intf->curr_seq = 0;
2815 #ifdef CONFIG_PROC_FS
2816         mutex_init(&intf->proc_entry_lock);
2817 #endif
2818         spin_lock_init(&intf->waiting_rcv_msgs_lock);
2819         INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
2820         tasklet_init(&intf->recv_tasklet,
2821                      smi_recv_tasklet,
2822                      (unsigned long) intf);
2823         atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
2824         spin_lock_init(&intf->xmit_msgs_lock);
2825         INIT_LIST_HEAD(&intf->xmit_msgs);
2826         INIT_LIST_HEAD(&intf->hp_xmit_msgs);
2827         spin_lock_init(&intf->events_lock);
2828         atomic_set(&intf->event_waiters, 0);
2829         intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
2830         INIT_LIST_HEAD(&intf->waiting_events);
2831         intf->waiting_events_count = 0;
2832         mutex_init(&intf->cmd_rcvrs_mutex);
2833         spin_lock_init(&intf->maintenance_mode_lock);
2834         INIT_LIST_HEAD(&intf->cmd_rcvrs);
2835         init_waitqueue_head(&intf->waitq);
2836         for (i = 0; i < IPMI_NUM_STATS; i++)
2837                 atomic_set(&intf->stats[i], 0);
2838 
2839         intf->proc_dir = NULL;
2840 
2841         mutex_lock(&smi_watchers_mutex);
2842         mutex_lock(&ipmi_interfaces_mutex);
2843         /* Look for a hole in the numbers. */
2844         i = 0;
2845         link = &ipmi_interfaces;
2846         list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) {
2847                 if (tintf->intf_num != i) {
2848                         link = &tintf->link;
2849                         break;
2850                 }
2851                 i++;
2852         }
2853         /* Add the new interface in numeric order. */
2854         if (i == 0)
2855                 list_add_rcu(&intf->link, &ipmi_interfaces);
2856         else
2857                 list_add_tail_rcu(&intf->link, link);
2858 
2859         rv = handlers->start_processing(send_info, intf);
2860         if (rv)
2861                 goto out;
2862 
2863         get_guid(intf);
2864 
2865         if ((intf->ipmi_version_major > 1)
2866                         || ((intf->ipmi_version_major == 1)
2867                             && (intf->ipmi_version_minor >= 5))) {
2868                 /*
2869                  * Start scanning the channels to see what is
2870                  * available.
2871                  */
2872                 intf->null_user_handler = channel_handler;
2873                 intf->curr_channel = 0;
2874                 rv = send_channel_info_cmd(intf, 0);
2875                 if (rv) {
2876                         printk(KERN_WARNING PFX
2877                                "Error sending channel information for channel"
2878                                " 0, %d\n", rv);
2879                         goto out;
2880                 }
2881 
2882                 /* Wait for the channel info to be read. */
2883                 wait_event(intf->waitq,
2884                            intf->curr_channel >= IPMI_MAX_CHANNELS);
2885                 intf->null_user_handler = NULL;
2886         } else {
2887                 /* Assume a single IPMB channel at zero. */
2888                 intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
2889                 intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
2890                 intf->curr_channel = IPMI_MAX_CHANNELS;
2891         }
2892 
2893         if (rv == 0)
2894                 rv = add_proc_entries(intf, i);
2895 
2896         rv = ipmi_bmc_register(intf, i);
2897 
2898  out:
2899         if (rv) {
2900                 if (intf->proc_dir)
2901                         remove_proc_entries(intf);
2902                 intf->handlers = NULL;
2903                 list_del_rcu(&intf->link);
2904                 mutex_unlock(&ipmi_interfaces_mutex);
2905                 mutex_unlock(&smi_watchers_mutex);
2906                 synchronize_rcu();
2907                 kref_put(&intf->refcount, intf_free);
2908         } else {
2909                 /*
2910                  * Keep memory order straight for RCU readers.  Make
2911                  * sure everything else is committed to memory before
2912                  * setting intf_num to mark the interface valid.
2913                  */
2914                 smp_wmb();
2915                 intf->intf_num = i;
2916                 mutex_unlock(&ipmi_interfaces_mutex);
2917                 /* After this point the interface is legal to use. */
2918                 call_smi_watchers(i, intf->si_dev);
2919                 mutex_unlock(&smi_watchers_mutex);
2920         }
2921 
2922         return rv;
2923 }
2924 EXPORT_SYMBOL(ipmi_register_smi);
2925 
2926 static void deliver_smi_err_response(ipmi_smi_t intf,
2927                                      struct ipmi_smi_msg *msg,
2928                                      unsigned char err)
2929 {
2930         msg->rsp[0] = msg->data[0] | 4;
2931         msg->rsp[1] = msg->data[1];
2932         msg->rsp[2] = err;
2933         msg->rsp_size = 3;
2934         /* It's an error, so it will never requeue, no need to check return. */
2935         handle_one_recv_msg(intf, msg);
2936 }
2937 
2938 static void cleanup_smi_msgs(ipmi_smi_t intf)
2939 {
2940         int              i;
2941         struct seq_table *ent;
2942         struct ipmi_smi_msg *msg;
2943         struct list_head *entry;
2944         struct list_head tmplist;
2945 
2946         /* Clear out our transmit queues and hold the messages. */
2947         INIT_LIST_HEAD(&tmplist);
2948         list_splice_tail(&intf->hp_xmit_msgs, &tmplist);
2949         list_splice_tail(&intf->xmit_msgs, &tmplist);
2950 
2951         /* Current message first, to preserve order */
2952         while (intf->curr_msg && !list_empty(&intf->waiting_rcv_msgs)) {
2953                 /* Wait for the message to clear out. */
2954                 schedule_timeout(1);
2955         }
2956 
2957         /* No need for locks, the interface is down. */
2958 
2959         /*
2960          * Return errors for all pending messages in queue and in the
2961          * tables waiting for remote responses.
2962          */
2963         while (!list_empty(&tmplist)) {
2964                 entry = tmplist.next;
2965                 list_del(entry);
2966                 msg = list_entry(entry, struct ipmi_smi_msg, link);
2967                 deliver_smi_err_response(intf, msg, IPMI_ERR_UNSPECIFIED);
2968         }
2969 
2970         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
2971                 ent = &(intf->seq_table[i]);
2972                 if (!ent->inuse)
2973                         continue;
2974                 deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED);
2975         }
2976 }
2977 
2978 int ipmi_unregister_smi(ipmi_smi_t intf)
2979 {
2980         struct ipmi_smi_watcher *w;
2981         int intf_num = intf->intf_num;
2982         ipmi_user_t user;
2983 
2984         ipmi_bmc_unregister(intf);
2985 
2986         mutex_lock(&smi_watchers_mutex);
2987         mutex_lock(&ipmi_interfaces_mutex);
2988         intf->intf_num = -1;
2989         intf->in_shutdown = true;
2990         list_del_rcu(&intf->link);
2991         mutex_unlock(&ipmi_interfaces_mutex);
2992         synchronize_rcu();
2993 
2994         cleanup_smi_msgs(intf);
2995 
2996         /* Clean up the effects of users on the lower-level software. */
2997         mutex_lock(&ipmi_interfaces_mutex);
2998         rcu_read_lock();
2999         list_for_each_entry_rcu(user, &intf->users, link) {
3000                 module_put(intf->handlers->owner);
3001                 if (intf->handlers->dec_usecount)
3002                         intf->handlers->dec_usecount(intf->send_info);
3003         }
3004         rcu_read_unlock();
3005         intf->handlers = NULL;
3006         mutex_unlock(&ipmi_interfaces_mutex);
3007 
3008         remove_proc_entries(intf);
3009 
3010         /*
3011          * Call all the watcher interfaces to tell them that
3012          * an interface is gone.
3013          */
3014         list_for_each_entry(w, &smi_watchers, link)
3015                 w->smi_gone(intf_num);
3016         mutex_unlock(&smi_watchers_mutex);
3017 
3018         kref_put(&intf->refcount, intf_free);
3019         return 0;
3020 }
3021 EXPORT_SYMBOL(ipmi_unregister_smi);
3022 
3023 static int handle_ipmb_get_msg_rsp(ipmi_smi_t          intf,
3024                                    struct ipmi_smi_msg *msg)
3025 {
3026         struct ipmi_ipmb_addr ipmb_addr;
3027         struct ipmi_recv_msg  *recv_msg;
3028 
3029         /*
3030          * This is 11, not 10, because the response must contain a
3031          * completion code.
3032          */
3033         if (msg->rsp_size < 11) {
3034                 /* Message not big enough, just ignore it. */
3035                 ipmi_inc_stat(intf, invalid_ipmb_responses);
3036                 return 0;
3037         }
3038 
3039         if (msg->rsp[2] != 0) {
3040                 /* An error getting the response, just ignore it. */
3041                 return 0;
3042         }
3043 
3044         ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
3045         ipmb_addr.slave_addr = msg->rsp[6];
3046         ipmb_addr.channel = msg->rsp[3] & 0x0f;
3047         ipmb_addr.lun = msg->rsp[7] & 3;
3048 
3049         /*
3050          * It's a response from a remote entity.  Look up the sequence
3051          * number and handle the response.
3052          */
3053         if (intf_find_seq(intf,
3054                           msg->rsp[7] >> 2,
3055                           msg->rsp[3] & 0x0f,
3056                           msg->rsp[8],
3057                           (msg->rsp[4] >> 2) & (~1),
3058                           (struct ipmi_addr *) &(ipmb_addr),
3059                           &recv_msg)) {
3060                 /*
3061                  * We were unable to find the sequence number,
3062                  * so just nuke the message.
3063                  */
3064                 ipmi_inc_stat(intf, unhandled_ipmb_responses);
3065                 return 0;
3066         }
3067 
3068         memcpy(recv_msg->msg_data,
3069                &(msg->rsp[9]),
3070                msg->rsp_size - 9);
3071         /*
3072          * The other fields matched, so no need to set them, except
3073          * for netfn, which needs to be the response that was
3074          * returned, not the request value.
3075          */
3076         recv_msg->msg.netfn = msg->rsp[4] >> 2;
3077         recv_msg->msg.data = recv_msg->msg_data;
3078         recv_msg->msg.data_len = msg->rsp_size - 10;
3079         recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
3080         ipmi_inc_stat(intf, handled_ipmb_responses);
3081         deliver_response(recv_msg);
3082 
3083         return 0;
3084 }
3085 
3086 static int handle_ipmb_get_msg_cmd(ipmi_smi_t          intf,
3087                                    struct ipmi_smi_msg *msg)
3088 {
3089         struct cmd_rcvr          *rcvr;
3090         int                      rv = 0;
3091         unsigned char            netfn;
3092         unsigned char            cmd;
3093         unsigned char            chan;
3094         ipmi_user_t              user = NULL;
3095         struct ipmi_ipmb_addr    *ipmb_addr;
3096         struct ipmi_recv_msg     *recv_msg;
3097 
3098         if (msg->rsp_size < 10) {
3099                 /* Message not big enough, just ignore it. */
3100                 ipmi_inc_stat(intf, invalid_commands);
3101                 return 0;
3102         }
3103 
3104         if (msg->rsp[2] != 0) {
3105                 /* An error getting the response, just ignore it. */
3106                 return 0;
3107         }
3108 
3109         netfn = msg->rsp[4] >> 2;
3110         cmd = msg->rsp[8];
3111         chan = msg->rsp[3] & 0xf;
3112 
3113         rcu_read_lock();
3114         rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3115         if (rcvr) {
3116                 user = rcvr->user;
3117                 kref_get(&user->refcount);
3118         } else
3119                 user = NULL;
3120         rcu_read_unlock();
3121 
3122         if (user == NULL) {
3123                 /* We didn't find a user, deliver an error response. */
3124                 ipmi_inc_stat(intf, unhandled_commands);
3125 
3126                 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
3127                 msg->data[1] = IPMI_SEND_MSG_CMD;
3128                 msg->data[2] = msg->rsp[3];
3129                 msg->data[3] = msg->rsp[6];
3130                 msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3);
3131                 msg->data[5] = ipmb_checksum(&(msg->data[3]), 2);
3132                 msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address;
3133                 /* rqseq/lun */
3134                 msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3);
3135                 msg->data[8] = msg->rsp[8]; /* cmd */
3136                 msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE;
3137                 msg->data[10] = ipmb_checksum(&(msg->data[6]), 4);
3138                 msg->data_size = 11;
3139 
3140 #ifdef DEBUG_MSGING
3141         {
3142                 int m;
3143                 printk("Invalid command:");
3144                 for (m = 0; m < msg->data_size; m++)
3145                         printk(" %2.2x", msg->data[m]);
3146                 printk("\n");
3147         }
3148 #endif
3149                 rcu_read_lock();
3150                 if (!intf->in_shutdown) {
3151                         smi_send(intf, intf->handlers, msg, 0);
3152                         /*
3153                          * We used the message, so return the value
3154                          * that causes it to not be freed or
3155                          * queued.
3156                          */
3157                         rv = -1;
3158                 }
3159                 rcu_read_unlock();
3160         } else {
3161                 /* Deliver the message to the user. */
3162                 ipmi_inc_stat(intf, handled_commands);
3163 
3164                 recv_msg = ipmi_alloc_recv_msg();
3165                 if (!recv_msg) {
3166                         /*
3167                          * We couldn't allocate memory for the
3168                          * message, so requeue it for handling
3169                          * later.
3170                          */
3171                         rv = 1;
3172                         kref_put(&user->refcount, free_user);
3173                 } else {
3174                         /* Extract the source address from the data. */
3175                         ipmb_addr = (struct ipmi_ipmb_addr *) &recv_msg->addr;
3176                         ipmb_addr->addr_type = IPMI_IPMB_ADDR_TYPE;
3177                         ipmb_addr->slave_addr = msg->rsp[6];
3178                         ipmb_addr->lun = msg->rsp[7] & 3;
3179                         ipmb_addr->channel = msg->rsp[3] & 0xf;
3180 
3181                         /*
3182                          * Extract the rest of the message information
3183                          * from the IPMB header.
3184                          */
3185                         recv_msg->user = user;
3186                         recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
3187                         recv_msg->msgid = msg->rsp[7] >> 2;
3188                         recv_msg->msg.netfn = msg->rsp[4] >> 2;
3189                         recv_msg->msg.cmd = msg->rsp[8];
3190                         recv_msg->msg.data = recv_msg->msg_data;
3191 
3192                         /*
3193                          * We chop off 10, not 9 bytes because the checksum
3194                          * at the end also needs to be removed.
3195                          */
3196                         recv_msg->msg.data_len = msg->rsp_size - 10;
3197                         memcpy(recv_msg->msg_data,
3198                                &(msg->rsp[9]),
3199                                msg->rsp_size - 10);
3200                         deliver_response(recv_msg);
3201                 }
3202         }
3203 
3204         return rv;
3205 }
3206 
3207 static int handle_lan_get_msg_rsp(ipmi_smi_t          intf,
3208                                   struct ipmi_smi_msg *msg)
3209 {
3210         struct ipmi_lan_addr  lan_addr;
3211         struct ipmi_recv_msg  *recv_msg;
3212 
3213 
3214         /*
3215          * This is 13, not 12, because the response must contain a
3216          * completion code.
3217          */
3218         if (msg->rsp_size < 13) {
3219                 /* Message not big enough, just ignore it. */
3220                 ipmi_inc_stat(intf, invalid_lan_responses);
3221                 return 0;
3222         }
3223 
3224         if (msg->rsp[2] != 0) {
3225                 /* An error getting the response, just ignore it. */
3226                 return 0;
3227         }
3228 
3229         lan_addr.addr_type = IPMI_LAN_ADDR_TYPE;
3230         lan_addr.session_handle = msg->rsp[4];
3231         lan_addr.remote_SWID = msg->rsp[8];
3232         lan_addr.local_SWID = msg->rsp[5];
3233         lan_addr.channel = msg->rsp[3] & 0x0f;
3234         lan_addr.privilege = msg->rsp[3] >> 4;
3235         lan_addr.lun = msg->rsp[9] & 3;
3236 
3237         /*
3238          * It's a response from a remote entity.  Look up the sequence
3239          * number and handle the response.
3240          */
3241         if (intf_find_seq(intf,
3242                           msg->rsp[9] >> 2,
3243                           msg->rsp[3] & 0x0f,
3244                           msg->rsp[10],
3245                           (msg->rsp[6] >> 2) & (~1),
3246                           (struct ipmi_addr *) &(lan_addr),
3247                           &recv_msg)) {
3248                 /*
3249                  * We were unable to find the sequence number,
3250                  * so just nuke the message.
3251                  */
3252                 ipmi_inc_stat(intf, unhandled_lan_responses);
3253                 return 0;
3254         }
3255 
3256         memcpy(recv_msg->msg_data,
3257                &(msg->rsp[11]),
3258                msg->rsp_size - 11);
3259         /*
3260          * The other fields matched, so no need to set them, except
3261          * for netfn, which needs to be the response that was
3262          * returned, not the request value.
3263          */
3264         recv_msg->msg.netfn = msg->rsp[6] >> 2;
3265         recv_msg->msg.data = recv_msg->msg_data;
3266         recv_msg->msg.data_len = msg->rsp_size - 12;
3267         recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
3268         ipmi_inc_stat(intf, handled_lan_responses);
3269         deliver_response(recv_msg);
3270 
3271         return 0;
3272 }
3273 
3274 static int handle_lan_get_msg_cmd(ipmi_smi_t          intf,
3275                                   struct ipmi_smi_msg *msg)
3276 {
3277         struct cmd_rcvr          *rcvr;
3278         int                      rv = 0;
3279         unsigned char            netfn;
3280         unsigned char            cmd;
3281         unsigned char            chan;
3282         ipmi_user_t              user = NULL;
3283         struct ipmi_lan_addr     *lan_addr;
3284         struct ipmi_recv_msg     *recv_msg;
3285 
3286         if (msg->rsp_size < 12) {
3287                 /* Message not big enough, just ignore it. */
3288                 ipmi_inc_stat(intf, invalid_commands);
3289                 return 0;
3290         }
3291 
3292         if (msg->rsp[2] != 0) {
3293                 /* An error getting the response, just ignore it. */
3294                 return 0;
3295         }
3296 
3297         netfn = msg->rsp[6] >> 2;
3298         cmd = msg->rsp[10];
3299         chan = msg->rsp[3] & 0xf;
3300 
3301         rcu_read_lock();
3302         rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3303         if (rcvr) {
3304                 user = rcvr->user;
3305                 kref_get(&user->refcount);
3306         } else
3307                 user = NULL;
3308         rcu_read_unlock();
3309 
3310         if (user == NULL) {
3311                 /* We didn't find a user, just give up. */
3312                 ipmi_inc_stat(intf, unhandled_commands);
3313 
3314                 /*
3315                  * Don't do anything with these messages, just allow
3316                  * them to be freed.
3317                  */
3318                 rv = 0;
3319         } else {
3320                 /* Deliver the message to the user. */
3321                 ipmi_inc_stat(intf, handled_commands);
3322 
3323                 recv_msg = ipmi_alloc_recv_msg();
3324                 if (!recv_msg) {
3325                         /*
3326                          * We couldn't allocate memory for the
3327                          * message, so requeue it for handling later.
3328                          */
3329                         rv = 1;
3330                         kref_put(&user->refcount, free_user);
3331                 } else {
3332                         /* Extract the source address from the data. */
3333                         lan_addr = (struct ipmi_lan_addr *) &recv_msg->addr;
3334                         lan_addr->addr_type = IPMI_LAN_ADDR_TYPE;
3335                         lan_addr->session_handle = msg->rsp[4];
3336                         lan_addr->remote_SWID = msg->rsp[8];
3337                         lan_addr->local_SWID = msg->rsp[5];
3338                         lan_addr->lun = msg->rsp[9] & 3;
3339                         lan_addr->channel = msg->rsp[3] & 0xf;
3340                         lan_addr->privilege = msg->rsp[3] >> 4;
3341 
3342                         /*
3343                          * Extract the rest of the message information
3344                          * from the IPMB header.
3345                          */
3346                         recv_msg->user = user;
3347                         recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
3348                         recv_msg->msgid = msg->rsp[9] >> 2;
3349                         recv_msg->msg.netfn = msg->rsp[6] >> 2;
3350                         recv_msg->msg.cmd = msg->rsp[10];
3351                         recv_msg->msg.data = recv_msg->msg_data;
3352 
3353                         /*
3354                          * We chop off 12, not 11 bytes because the checksum
3355                          * at the end also needs to be removed.
3356                          */
3357                         recv_msg->msg.data_len = msg->rsp_size - 12;
3358                         memcpy(recv_msg->msg_data,
3359                                &(msg->rsp[11]),
3360                                msg->rsp_size - 12);
3361                         deliver_response(recv_msg);
3362                 }
3363         }
3364 
3365         return rv;
3366 }
3367 
3368 /*
3369  * This routine will handle "Get Message" command responses with
3370  * channels that use an OEM Medium. The message format belongs to
3371  * the OEM.  See IPMI 2.0 specification, Chapter 6 and
3372  * Chapter 22, sections 22.6 and 22.24 for more details.
3373  */
3374 static int handle_oem_get_msg_cmd(ipmi_smi_t          intf,
3375                                   struct ipmi_smi_msg *msg)
3376 {
3377         struct cmd_rcvr       *rcvr;
3378         int                   rv = 0;
3379         unsigned char         netfn;
3380         unsigned char         cmd;
3381         unsigned char         chan;
3382         ipmi_user_t           user = NULL;
3383         struct ipmi_system_interface_addr *smi_addr;
3384         struct ipmi_recv_msg  *recv_msg;
3385 
3386         /*
3387          * We expect the OEM SW to perform error checking
3388          * so we just do some basic sanity checks
3389          */
3390         if (msg->rsp_size < 4) {
3391                 /* Message not big enough, just ignore it. */
3392                 ipmi_inc_stat(intf, invalid_commands);
3393                 return 0;
3394         }
3395 
3396         if (msg->rsp[2] != 0) {
3397                 /* An error getting the response, just ignore it. */
3398                 return 0;
3399         }
3400 
3401         /*
3402          * This is an OEM Message so the OEM needs to know how
3403          * handle the message. We do no interpretation.
3404          */
3405         netfn = msg->rsp[0] >> 2;
3406         cmd = msg->rsp[1];
3407         chan = msg->rsp[3] & 0xf;
3408 
3409         rcu_read_lock();
3410         rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3411         if (rcvr) {
3412                 user = rcvr->user;
3413                 kref_get(&user->refcount);
3414         } else
3415                 user = NULL;
3416         rcu_read_unlock();
3417 
3418         if (user == NULL) {
3419                 /* We didn't find a user, just give up. */
3420                 ipmi_inc_stat(intf, unhandled_commands);
3421 
3422                 /*
3423                  * Don't do anything with these messages, just allow
3424                  * them to be freed.
3425                  */
3426 
3427                 rv = 0;
3428         } else {
3429                 /* Deliver the message to the user. */
3430                 ipmi_inc_stat(intf, handled_commands);
3431 
3432                 recv_msg = ipmi_alloc_recv_msg();
3433                 if (!recv_msg) {
3434                         /*
3435                          * We couldn't allocate memory for the
3436                          * message, so requeue it for handling
3437                          * later.
3438                          */
3439                         rv = 1;
3440                         kref_put(&user->refcount, free_user);
3441                 } else {
3442                         /*
3443                          * OEM Messages are expected to be delivered via
3444                          * the system interface to SMS software.  We might
3445                          * need to visit this again depending on OEM
3446                          * requirements
3447                          */
3448                         smi_addr = ((struct ipmi_system_interface_addr *)
3449                                     &(recv_msg->addr));
3450                         smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3451                         smi_addr->channel = IPMI_BMC_CHANNEL;
3452                         smi_addr->lun = msg->rsp[0] & 3;
3453 
3454                         recv_msg->user = user;
3455                         recv_msg->user_msg_data = NULL;
3456                         recv_msg->recv_type = IPMI_OEM_RECV_TYPE;
3457                         recv_msg->msg.netfn = msg->rsp[0] >> 2;
3458                         recv_msg->msg.cmd = msg->rsp[1];
3459                         recv_msg->msg.data = recv_msg->msg_data;
3460 
3461                         /*
3462                          * The message starts at byte 4 which follows the
3463                          * the Channel Byte in the "GET MESSAGE" command
3464                          */
3465                         recv_msg->msg.data_len = msg->rsp_size - 4;
3466                         memcpy(recv_msg->msg_data,
3467                                &(msg->rsp[4]),
3468                                msg->rsp_size - 4);
3469                         deliver_response(recv_msg);
3470                 }
3471         }
3472 
3473         return rv;
3474 }
3475 
3476 static void copy_event_into_recv_msg(struct ipmi_recv_msg *recv_msg,
3477                                      struct ipmi_smi_msg  *msg)
3478 {
3479         struct ipmi_system_interface_addr *smi_addr;
3480 
3481         recv_msg->msgid = 0;
3482         smi_addr = (struct ipmi_system_interface_addr *) &(recv_msg->addr);
3483         smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3484         smi_addr->channel = IPMI_BMC_CHANNEL;
3485         smi_addr->lun = msg->rsp[0] & 3;
3486         recv_msg->recv_type = IPMI_ASYNC_EVENT_RECV_TYPE;
3487         recv_msg->msg.netfn = msg->rsp[0] >> 2;
3488         recv_msg->msg.cmd = msg->rsp[1];
3489         memcpy(recv_msg->msg_data, &(msg->rsp[3]), msg->rsp_size - 3);
3490         recv_msg->msg.data = recv_msg->msg_data;
3491         recv_msg->msg.data_len = msg->rsp_size - 3;
3492 }
3493 
3494 static int handle_read_event_rsp(ipmi_smi_t          intf,
3495                                  struct ipmi_smi_msg *msg)
3496 {
3497         struct ipmi_recv_msg *recv_msg, *recv_msg2;
3498         struct list_head     msgs;
3499         ipmi_user_t          user;
3500         int                  rv = 0;
3501         int                  deliver_count = 0;
3502         unsigned long        flags;
3503 
3504         if (msg->rsp_size < 19) {
3505                 /* Message is too small to be an IPMB event. */
3506                 ipmi_inc_stat(intf, invalid_events);
3507                 return 0;
3508         }
3509 
3510         if (msg->rsp[2] != 0) {
3511                 /* An error getting the event, just ignore it. */
3512                 return 0;
3513         }
3514 
3515         INIT_LIST_HEAD(&msgs);
3516 
3517         spin_lock_irqsave(&intf->events_lock, flags);
3518 
3519         ipmi_inc_stat(intf, events);
3520 
3521         /*
3522          * Allocate and fill in one message for every user that is
3523          * getting events.
3524          */
3525         rcu_read_lock();
3526         list_for_each_entry_rcu(user, &intf->users, link) {
3527                 if (!user->gets_events)
3528                         continue;
3529 
3530                 recv_msg = ipmi_alloc_recv_msg();
3531                 if (!recv_msg) {
3532                         rcu_read_unlock();
3533                         list_for_each_entry_safe(recv_msg, recv_msg2, &msgs,
3534                                                  link) {
3535                                 list_del(&recv_msg->link);
3536                                 ipmi_free_recv_msg(recv_msg);
3537                         }
3538                         /*
3539                          * We couldn't allocate memory for the
3540                          * message, so requeue it for handling
3541                          * later.
3542                          */
3543                         rv = 1;
3544                         goto out;
3545                 }
3546 
3547                 deliver_count++;
3548 
3549                 copy_event_into_recv_msg(recv_msg, msg);
3550                 recv_msg->user = user;
3551                 kref_get(&user->refcount);
3552                 list_add_tail(&(recv_msg->link), &msgs);
3553         }
3554         rcu_read_unlock();
3555 
3556         if (deliver_count) {
3557                 /* Now deliver all the messages. */
3558                 list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, link) {
3559                         list_del(&recv_msg->link);
3560                         deliver_response(recv_msg);
3561                 }
3562         } else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) {
3563                 /*
3564                  * No one to receive the message, put it in queue if there's
3565                  * not already too many things in the queue.
3566                  */
3567                 recv_msg = ipmi_alloc_recv_msg();
3568                 if (!recv_msg) {
3569                         /*
3570                          * We couldn't allocate memory for the
3571                          * message, so requeue it for handling
3572                          * later.
3573                          */
3574                         rv = 1;
3575                         goto out;
3576                 }
3577 
3578                 copy_event_into_recv_msg(recv_msg, msg);
3579                 list_add_tail(&(recv_msg->link), &(intf->waiting_events));
3580                 intf->waiting_events_count++;
3581         } else if (!intf->event_msg_printed) {
3582                 /*
3583                  * There's too many things in the queue, discard this
3584                  * message.
3585                  */
3586                 printk(KERN_WARNING PFX "Event queue full, discarding"
3587                        " incoming events\n");
3588                 intf->event_msg_printed = 1;
3589         }
3590 
3591  out:
3592         spin_unlock_irqrestore(&(intf->events_lock), flags);
3593 
3594         return rv;
3595 }
3596 
3597 static int handle_bmc_rsp(ipmi_smi_t          intf,
3598                           struct ipmi_smi_msg *msg)
3599 {
3600         struct ipmi_recv_msg *recv_msg;
3601         struct ipmi_user     *user;
3602 
3603         recv_msg = (struct ipmi_recv_msg *) msg->user_data;
3604         if (recv_msg == NULL) {
3605                 printk(KERN_WARNING
3606                        "IPMI message received with no owner. This\n"
3607                        "could be because of a malformed message, or\n"
3608                        "because of a hardware error.  Contact your\n"
3609                        "hardware vender for assistance\n");
3610                 return 0;
3611         }
3612 
3613         user = recv_msg->user;
3614         /* Make sure the user still exists. */
3615         if (user && !user->valid) {
3616                 /* The user for the message went away, so give up. */
3617                 ipmi_inc_stat(intf, unhandled_local_responses);
3618                 ipmi_free_recv_msg(recv_msg);
3619         } else {
3620                 struct ipmi_system_interface_addr *smi_addr;
3621 
3622                 ipmi_inc_stat(intf, handled_local_responses);
3623                 recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
3624                 recv_msg->msgid = msg->msgid;
3625                 smi_addr = ((struct ipmi_system_interface_addr *)
3626                             &(recv_msg->addr));
3627                 smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3628                 smi_addr->channel = IPMI_BMC_CHANNEL;
3629                 smi_addr->lun = msg->rsp[0] & 3;
3630                 recv_msg->msg.netfn = msg->rsp[0] >> 2;
3631                 recv_msg->msg.cmd = msg->rsp[1];
3632                 memcpy(recv_msg->msg_data,
3633                        &(msg->rsp[2]),
3634                        msg->rsp_size - 2);
3635                 recv_msg->msg.data = recv_msg->msg_data;
3636                 recv_msg->msg.data_len = msg->rsp_size - 2;
3637                 deliver_response(recv_msg);
3638         }
3639 
3640         return 0;
3641 }
3642 
3643 /*
3644  * Handle a received message.  Return 1 if the message should be requeued,
3645  * 0 if the message should be freed, or -1 if the message should not
3646  * be freed or requeued.
3647  */
3648 static int handle_one_recv_msg(ipmi_smi_t          intf,
3649                                struct ipmi_smi_msg *msg)
3650 {
3651         int requeue;
3652         int chan;
3653 
3654 #ifdef DEBUG_MSGING
3655         int m;
3656         printk("Recv:");
3657         for (m = 0; m < msg->rsp_size; m++)
3658                 printk(" %2.2x", msg->rsp[m]);
3659         printk("\n");
3660 #endif
3661         if (msg->rsp_size < 2) {
3662                 /* Message is too small to be correct. */
3663                 printk(KERN_WARNING PFX "BMC returned to small a message"
3664                        " for netfn %x cmd %x, got %d bytes\n",
3665                        (msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);
3666 
3667                 /* Generate an error response for the message. */
3668                 msg->rsp[0] = msg->data[0] | (1 << 2);
3669                 msg->rsp[1] = msg->data[1];
3670                 msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
3671                 msg->rsp_size = 3;
3672         } else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))
3673                    || (msg->rsp[1] != msg->data[1])) {
3674                 /*
3675                  * The NetFN and Command in the response is not even
3676                  * marginally correct.
3677                  */
3678                 printk(KERN_WARNING PFX "BMC returned incorrect response,"
3679                        " expected netfn %x cmd %x, got netfn %x cmd %x\n",
3680                        (msg->data[0] >> 2) | 1, msg->data[1],
3681                        msg->rsp[0] >> 2, msg->rsp[1]);
3682 
3683                 /* Generate an error response for the message. */
3684                 msg->rsp[0] = msg->data[0] | (1 << 2);
3685                 msg->rsp[1] = msg->data[1];
3686                 msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
3687                 msg->rsp_size = 3;
3688         }
3689 
3690         if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3691             && (msg->rsp[1] == IPMI_SEND_MSG_CMD)
3692             && (msg->user_data != NULL)) {
3693                 /*
3694                  * It's a response to a response we sent.  For this we
3695                  * deliver a send message response to the user.
3696                  */
3697                 struct ipmi_recv_msg     *recv_msg = msg->user_data;
3698 
3699                 requeue = 0;
3700                 if (msg->rsp_size < 2)
3701                         /* Message is too small to be correct. */
3702                         goto out;
3703 
3704                 chan = msg->data[2] & 0x0f;
3705                 if (chan >= IPMI_MAX_CHANNELS)
3706                         /* Invalid channel number */
3707                         goto out;
3708 
3709                 if (!recv_msg)
3710                         goto out;
3711 
3712                 /* Make sure the user still exists. */
3713                 if (!recv_msg->user || !recv_msg->user->valid)
3714                         goto out;
3715 
3716                 recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE;
3717                 recv_msg->msg.data = recv_msg->msg_data;
3718                 recv_msg->msg.data_len = 1;
3719                 recv_msg->msg_data[0] = msg->rsp[2];
3720                 deliver_response(recv_msg);
3721         } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3722                    && (msg->rsp[1] == IPMI_GET_MSG_CMD)) {
3723                 /* It's from the receive queue. */
3724                 chan = msg->rsp[3] & 0xf;
3725                 if (chan >= IPMI_MAX_CHANNELS) {
3726                         /* Invalid channel number */
3727                         requeue = 0;
3728                         goto out;
3729                 }
3730 
3731                 /*
3732                  * We need to make sure the channels have been initialized.
3733                  * The channel_handler routine will set the "curr_channel"
3734                  * equal to or greater than IPMI_MAX_CHANNELS when all the
3735                  * channels for this interface have been initialized.
3736                  */
3737                 if (intf->curr_channel < IPMI_MAX_CHANNELS) {
3738                         requeue = 0; /* Throw the message away */
3739                         goto out;
3740                 }
3741 
3742                 switch (intf->channels[chan].medium) {
3743                 case IPMI_CHANNEL_MEDIUM_IPMB:
3744                         if (msg->rsp[4] & 0x04) {
3745                                 /*
3746                                  * It's a response, so find the
3747                                  * requesting message and send it up.
3748                                  */
3749                                 requeue = handle_ipmb_get_msg_rsp(intf, msg);
3750                         } else {
3751                                 /*
3752                                  * It's a command to the SMS from some other
3753                                  * entity.  Handle that.
3754                                  */
3755                                 requeue = handle_ipmb_get_msg_cmd(intf, msg);
3756                         }
3757                         break;
3758 
3759                 case IPMI_CHANNEL_MEDIUM_8023LAN:
3760                 case IPMI_CHANNEL_MEDIUM_ASYNC:
3761                         if (msg->rsp[6] & 0x04) {
3762                                 /*
3763                                  * It's a response, so find the
3764                                  * requesting message and send it up.
3765                                  */
3766                                 requeue = handle_lan_get_msg_rsp(intf, msg);
3767                         } else {
3768                                 /*
3769                                  * It's a command to the SMS from some other
3770                                  * entity.  Handle that.
3771                                  */
3772                                 requeue = handle_lan_get_msg_cmd(intf, msg);
3773                         }
3774                         break;
3775 
3776                 default:
3777                         /* Check for OEM Channels.  Clients had better
3778                            register for these commands. */
3779                         if ((intf->channels[chan].medium
3780                              >= IPMI_CHANNEL_MEDIUM_OEM_MIN)
3781                             && (intf->channels[chan].medium
3782                                 <= IPMI_CHANNEL_MEDIUM_OEM_MAX)) {
3783                                 requeue = handle_oem_get_msg_cmd(intf, msg);
3784                         } else {
3785                                 /*
3786                                  * We don't handle the channel type, so just
3787                                  * free the message.
3788                                  */
3789                                 requeue = 0;
3790                         }
3791                 }
3792 
3793         } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3794                    && (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD)) {
3795                 /* It's an asynchronous event. */
3796                 requeue = handle_read_event_rsp(intf, msg);
3797         } else {
3798                 /* It's a response from the local BMC. */
3799                 requeue = handle_bmc_rsp(intf, msg);
3800         }
3801 
3802  out:
3803         return requeue;
3804 }
3805 
3806 /*
3807  * If there are messages in the queue or pretimeouts, handle them.
3808  */
3809 static void handle_new_recv_msgs(ipmi_smi_t intf)
3810 {
3811         struct ipmi_smi_msg  *smi_msg;
3812         unsigned long        flags = 0;
3813         int                  rv;
3814         int                  run_to_completion = intf->run_to_completion;
3815 
3816         /* See if any waiting messages need to be processed. */
3817         if (!run_to_completion)
3818                 spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
3819         while (!list_empty(&intf->waiting_rcv_msgs)) {
3820                 smi_msg = list_entry(intf->waiting_rcv_msgs.next,
3821                                      struct ipmi_smi_msg, link);
3822                 if (!run_to_completion)
3823                         spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
3824                                                flags);
3825                 rv = handle_one_recv_msg(intf, smi_msg);
3826                 if (!run_to_completion)
3827                         spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
3828                 if (rv > 0) {
3829                         /*
3830                          * To preserve message order, quit if we
3831                          * can't handle a message.
3832                          */
3833                         break;
3834                 } else {
3835                         list_del(&smi_msg->link);
3836                         if (rv == 0)
3837                                 /* Message handled */
3838                                 ipmi_free_smi_msg(smi_msg);
3839                         /* If rv < 0, fatal error, del but don't free. */
3840                 }
3841         }
3842         if (!run_to_completion)
3843                 spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock, flags);
3844 
3845         /*
3846          * If the pretimout count is non-zero, decrement one from it and
3847          * deliver pretimeouts to all the users.
3848          */
3849         if (atomic_add_unless(&intf->watchdog_pretimeouts_to_deliver, -1, 0)) {
3850                 ipmi_user_t user;
3851 
3852                 rcu_read_lock();
3853                 list_for_each_entry_rcu(user, &intf->users, link) {
3854                         if (user->handler->ipmi_watchdog_pretimeout)
3855                                 user->handler->ipmi_watchdog_pretimeout(
3856                                         user->handler_data);
3857                 }
3858                 rcu_read_unlock();
3859         }
3860 }
3861 
3862 static void smi_recv_tasklet(unsigned long val)
3863 {
3864         unsigned long flags = 0; /* keep us warning-free. */
3865         ipmi_smi_t intf = (ipmi_smi_t) val;
3866         int run_to_completion = intf->run_to_completion;
3867         struct ipmi_smi_msg *newmsg = NULL;
3868 
3869         /*
3870          * Start the next message if available.
3871          *
3872          * Do this here, not in the actual receiver, because we may deadlock
3873          * because the lower layer is allowed to hold locks while calling
3874          * message delivery.
3875          */
3876         if (!run_to_completion)
3877                 spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
3878         if (intf->curr_msg == NULL && !intf->in_shutdown) {
3879                 struct list_head *entry = NULL;
3880 
3881                 /* Pick the high priority queue first. */
3882                 if (!list_empty(&intf->hp_xmit_msgs))
3883                         entry = intf->hp_xmit_msgs.next;
3884                 else if (!list_empty(&intf->xmit_msgs))
3885                         entry = intf->xmit_msgs.next;
3886 
3887                 if (entry) {
3888                         list_del(entry);
3889                         newmsg = list_entry(entry, struct ipmi_smi_msg, link);
3890                         intf->curr_msg = newmsg;
3891                 }
3892         }
3893         if (!run_to_completion)
3894                 spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
3895         if (newmsg)
3896                 intf->handlers->sender(intf->send_info, newmsg);
3897 
3898         handle_new_recv_msgs(intf);
3899 }
3900 
3901 /* Handle a new message from the lower layer. */
3902 void ipmi_smi_msg_received(ipmi_smi_t          intf,
3903                            struct ipmi_smi_msg *msg)
3904 {
3905         unsigned long flags = 0; /* keep us warning-free. */
3906         int run_to_completion = intf->run_to_completion;
3907 
3908         if ((msg->data_size >= 2)
3909             && (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
3910             && (msg->data[1] == IPMI_SEND_MSG_CMD)
3911             && (msg->user_data == NULL)) {
3912 
3913                 if (intf->in_shutdown)
3914                         goto free_msg;
3915 
3916                 /*
3917                  * This is the local response to a command send, start
3918                  * the timer for these.  The user_data will not be
3919                  * NULL if this is a response send, and we will let
3920                  * response sends just go through.
3921                  */
3922 
3923                 /*
3924                  * Check for errors, if we get certain errors (ones
3925                  * that mean basically we can try again later), we
3926                  * ignore them and start the timer.  Otherwise we
3927                  * report the error immediately.
3928                  */
3929                 if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0)
3930                     && (msg->rsp[2] != IPMI_NODE_BUSY_ERR)
3931                     && (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR)
3932                     && (msg->rsp[2] != IPMI_BUS_ERR)
3933                     && (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR)) {
3934                         int chan = msg->rsp[3] & 0xf;
3935 
3936                         /* Got an error sending the message, handle it. */
3937                         if (chan >= IPMI_MAX_CHANNELS)
3938                                 ; /* This shouldn't happen */
3939                         else if ((intf->channels[chan].medium
3940                                   == IPMI_CHANNEL_MEDIUM_8023LAN)
3941                                  || (intf->channels[chan].medium
3942                                      == IPMI_CHANNEL_MEDIUM_ASYNC))
3943                                 ipmi_inc_stat(intf, sent_lan_command_errs);
3944                         else
3945                                 ipmi_inc_stat(intf, sent_ipmb_command_errs);
3946                         intf_err_seq(intf, msg->msgid, msg->rsp[2]);
3947                 } else
3948                         /* The message was sent, start the timer. */
3949                         intf_start_seq_timer(intf, msg->msgid);
3950 
3951 free_msg:
3952                 ipmi_free_smi_msg(msg);
3953         } else {
3954                 /*
3955                  * To preserve message order, we keep a queue and deliver from
3956                  * a tasklet.
3957                  */
3958                 if (!run_to_completion)
3959                         spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
3960                 list_add_tail(&msg->link, &intf->waiting_rcv_msgs);
3961                 if (!run_to_completion)
3962                         spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
3963                                                flags);
3964         }
3965 
3966         if (!run_to_completion)
3967                 spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
3968         /*
3969          * We can get an asynchronous event or receive message in addition
3970          * to commands we send.
3971          */
3972         if (msg == intf->curr_msg)
3973                 intf->curr_msg = NULL;
3974         if (!run_to_completion)
3975                 spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
3976 
3977         if (run_to_completion)
3978                 smi_recv_tasklet((unsigned long) intf);
3979         else
3980                 tasklet_schedule(&intf->recv_tasklet);
3981 }
3982 EXPORT_SYMBOL(ipmi_smi_msg_received);
3983 
3984 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf)
3985 {
3986         if (intf->in_shutdown)
3987                 return;
3988 
3989         atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1);
3990         tasklet_schedule(&intf->recv_tasklet);
3991 }
3992 EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout);
3993 
3994 static struct ipmi_smi_msg *
3995 smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg,
3996                   unsigned char seq, long seqid)
3997 {
3998         struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg();
3999         if (!smi_msg)
4000                 /*
4001                  * If we can't allocate the message, then just return, we
4002                  * get 4 retries, so this should be ok.
4003                  */
4004                 return NULL;
4005 
4006         memcpy(smi_msg->data, recv_msg->msg.data, recv_msg->msg.data_len);
4007         smi_msg->data_size = recv_msg->msg.data_len;
4008         smi_msg->msgid = STORE_SEQ_IN_MSGID(seq, seqid);
4009 
4010 #ifdef DEBUG_MSGING
4011         {
4012                 int m;
4013                 printk("Resend: ");
4014                 for (m = 0; m < smi_msg->data_size; m++)
4015                         printk(" %2.2x", smi_msg->data[m]);
4016                 printk("\n");
4017         }
4018 #endif
4019         return smi_msg;
4020 }
4021 
4022 static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
4023                               struct list_head *timeouts, long timeout_period,
4024                               int slot, unsigned long *flags,
4025                               unsigned int *waiting_msgs)
4026 {
4027         struct ipmi_recv_msg     *msg;
4028         const struct ipmi_smi_handlers *handlers;
4029 
4030         if (intf->in_shutdown)
4031                 return;
4032 
4033         if (!ent->inuse)
4034                 return;
4035 
4036         ent->timeout -= timeout_period;
4037         if (ent->timeout > 0) {
4038                 (*waiting_msgs)++;
4039                 return;
4040         }
4041 
4042         if (ent->retries_left == 0) {
4043                 /* The message has used all its retries. */
4044                 ent->inuse = 0;
4045                 msg = ent->recv_msg;
4046                 list_add_tail(&msg->link, timeouts);
4047                 if (ent->broadcast)
4048                         ipmi_inc_stat(intf, timed_out_ipmb_broadcasts);
4049                 else if (is_lan_addr(&ent->recv_msg->addr))
4050                         ipmi_inc_stat(intf, timed_out_lan_commands);
4051                 else
4052                         ipmi_inc_stat(intf, timed_out_ipmb_commands);
4053         } else {
4054                 struct ipmi_smi_msg *smi_msg;
4055                 /* More retries, send again. */
4056 
4057                 (*waiting_msgs)++;
4058 
4059                 /*
4060                  * Start with the max timer, set to normal timer after
4061                  * the message is sent.
4062                  */
4063                 ent->timeout = MAX_MSG_TIMEOUT;
4064                 ent->retries_left--;
4065                 smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot,
4066                                             ent->seqid);
4067                 if (!smi_msg) {
4068                         if (is_lan_addr(&ent->recv_msg->addr))
4069                                 ipmi_inc_stat(intf,
4070                                               dropped_rexmit_lan_commands);
4071                         else
4072                                 ipmi_inc_stat(intf,
4073                                               dropped_rexmit_ipmb_commands);
4074                         return;
4075                 }
4076 
4077                 spin_unlock_irqrestore(&intf->seq_lock, *flags);
4078 
4079                 /*
4080                  * Send the new message.  We send with a zero
4081                  * priority.  It timed out, I doubt time is that
4082                  * critical now, and high priority messages are really
4083                  * only for messages to the local MC, which don't get
4084                  * resent.
4085                  */
4086                 handlers = intf->handlers;
4087                 if (handlers) {
4088                         if (is_lan_addr(&ent->recv_msg->addr))
4089                                 ipmi_inc_stat(intf,
4090                                               retransmitted_lan_commands);
4091                         else
4092                                 ipmi_inc_stat(intf,
4093                                               retransmitted_ipmb_commands);
4094 
4095                         smi_send(intf, handlers, smi_msg, 0);
4096                 } else
4097                         ipmi_free_smi_msg(smi_msg);
4098 
4099                 spin_lock_irqsave(&intf->seq_lock, *flags);
4100         }
4101 }
4102 
4103 static unsigned int ipmi_timeout_handler(ipmi_smi_t intf, long timeout_period)
4104 {
4105         struct list_head     timeouts;
4106         struct ipmi_recv_msg *msg, *msg2;
4107         unsigned long        flags;
4108         int                  i;
4109         unsigned int         waiting_msgs = 0;
4110 
4111         /*
4112          * Go through the seq table and find any messages that
4113          * have timed out, putting them in the timeouts
4114          * list.
4115          */
4116         INIT_LIST_HEAD(&timeouts);
4117         spin_lock_irqsave(&intf->seq_lock, flags);
4118         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
4119                 check_msg_timeout(intf, &(intf->seq_table[i]),
4120                                   &timeouts, timeout_period, i,
4121                                   &flags, &waiting_msgs);
4122         spin_unlock_irqrestore(&intf->seq_lock, flags);
4123 
4124         list_for_each_entry_safe(msg, msg2, &timeouts, link)
4125                 deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);
4126 
4127         /*
4128          * Maintenance mode handling.  Check the timeout
4129          * optimistically before we claim the lock.  It may
4130          * mean a timeout gets missed occasionally, but that
4131          * only means the timeout gets extended by one period
4132          * in that case.  No big deal, and it avoids the lock
4133          * most of the time.
4134          */
4135         if (intf->auto_maintenance_timeout > 0) {
4136                 spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
4137                 if (intf->auto_maintenance_timeout > 0) {
4138                         intf->auto_maintenance_timeout
4139                                 -= timeout_period;
4140                         if (!intf->maintenance_mode
4141                             && (intf->auto_maintenance_timeout <= 0)) {
4142                                 intf->maintenance_mode_enable = false;
4143                                 maintenance_mode_update(intf);
4144                         }
4145                 }
4146                 spin_unlock_irqrestore(&intf->maintenance_mode_lock,
4147                                        flags);
4148         }
4149 
4150         tasklet_schedule(&intf->recv_tasklet);
4151 
4152         return waiting_msgs;
4153 }
4154 
4155 static void ipmi_request_event(ipmi_smi_t intf)
4156 {
4157         /* No event requests when in maintenance mode. */
4158         if (intf->maintenance_mode_enable)
4159                 return;
4160 
4161         if (!intf->in_shutdown)
4162                 intf->handlers->request_events(intf->send_info);
4163 }
4164 
4165 static struct timer_list ipmi_timer;
4166 
4167 static atomic_t stop_operation;
4168 
4169 static void ipmi_timeout(unsigned long data)
4170 {
4171         ipmi_smi_t intf;
4172         int nt = 0;
4173 
4174         if (atomic_read(&stop_operation))
4175                 return;
4176 
4177         rcu_read_lock();
4178         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4179                 int lnt = 0;
4180 
4181                 if (atomic_read(&intf->event_waiters)) {
4182                         intf->ticks_to_req_ev--;
4183                         if (intf->ticks_to_req_ev == 0) {
4184                                 ipmi_request_event(intf);
4185                                 intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
4186                         }
4187                         lnt++;
4188                 }
4189 
4190                 lnt += ipmi_timeout_handler(intf, IPMI_TIMEOUT_TIME);
4191 
4192                 lnt = !!lnt;
4193                 if (lnt != intf->last_needs_timer &&
4194                                         intf->handlers->set_need_watch)
4195                         intf->handlers->set_need_watch(intf->send_info, lnt);
4196                 intf->last_needs_timer = lnt;
4197 
4198                 nt += lnt;
4199         }
4200         rcu_read_unlock();
4201 
4202         if (nt)
4203                 mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
4204 }
4205 
4206 static void need_waiter(ipmi_smi_t intf)
4207 {
4208         /* Racy, but worst case we start the timer twice. */
4209         if (!timer_pending(&ipmi_timer))
4210                 mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
4211 }
4212 
4213 static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
4214 static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
4215 
4216 static void free_smi_msg(struct ipmi_smi_msg *msg)
4217 {
4218         atomic_dec(&smi_msg_inuse_count);
4219         kfree(msg);
4220 }
4221 
4222 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void)
4223 {
4224         struct ipmi_smi_msg *rv;
4225         rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC);
4226         if (rv) {
4227                 rv->done = free_smi_msg;
4228                 rv->user_data = NULL;
4229                 atomic_inc(&smi_msg_inuse_count);
4230         }
4231         return rv;
4232 }
4233 EXPORT_SYMBOL(ipmi_alloc_smi_msg);
4234 
4235 static void free_recv_msg(struct ipmi_recv_msg *msg)
4236 {
4237         atomic_dec(&recv_msg_inuse_count);
4238         kfree(msg);
4239 }
4240 
4241 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void)
4242 {
4243         struct ipmi_recv_msg *rv;
4244 
4245         rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
4246         if (rv) {
4247                 rv->user = NULL;
4248                 rv->done = free_recv_msg;
4249                 atomic_inc(&recv_msg_inuse_count);
4250         }
4251         return rv;
4252 }
4253 
4254 void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
4255 {
4256         if (msg->user)
4257                 kref_put(&msg->user->refcount, free_user);
4258         msg->done(msg);
4259 }
4260 EXPORT_SYMBOL(ipmi_free_recv_msg);
4261 
4262 #ifdef CONFIG_IPMI_PANIC_EVENT
4263 
4264 static atomic_t panic_done_count = ATOMIC_INIT(0);
4265 
4266 static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
4267 {
4268         atomic_dec(&panic_done_count);
4269 }
4270 
4271 static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
4272 {
4273         atomic_dec(&panic_done_count);
4274 }
4275 
4276 /*
4277  * Inside a panic, send a message and wait for a response.
4278  */
4279 static void ipmi_panic_request_and_wait(ipmi_smi_t           intf,
4280                                         struct ipmi_addr     *addr,
4281                                         struct kernel_ipmi_msg *msg)
4282 {
4283         struct ipmi_smi_msg  smi_msg;
4284         struct ipmi_recv_msg recv_msg;
4285         int rv;
4286 
4287         smi_msg.done = dummy_smi_done_handler;
4288         recv_msg.done = dummy_recv_done_handler;
4289         atomic_add(2, &panic_done_count);
4290         rv = i_ipmi_request(NULL,
4291                             intf,
4292                             addr,
4293                             0,
4294                             msg,
4295                             intf,
4296                             &smi_msg,
4297                             &recv_msg,
4298                             0,
4299                             intf->channels[0].address,
4300                             intf->channels[0].lun,
4301                             0, 1); /* Don't retry, and don't wait. */
4302         if (rv)
4303                 atomic_sub(2, &panic_done_count);
4304         else if (intf->handlers->flush_messages)
4305                 intf->handlers->flush_messages(intf->send_info);
4306 
4307         while (atomic_read(&panic_done_count) != 0)
4308                 ipmi_poll(intf);
4309 }
4310 
4311 #ifdef CONFIG_IPMI_PANIC_STRING
4312 static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
4313 {
4314         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
4315             && (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE)
4316             && (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD)
4317             && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
4318                 /* A get event receiver command, save it. */
4319                 intf->event_receiver = msg->msg.data[1];
4320                 intf->event_receiver_lun = msg->msg.data[2] & 0x3;
4321         }
4322 }
4323 
4324 static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
4325 {
4326         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
4327             && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
4328             && (msg->msg.cmd == IPMI_GET_DEVICE_ID_CMD)
4329             && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
4330                 /*
4331                  * A get device id command, save if we are an event
4332                  * receiver or generator.
4333                  */
4334                 intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
4335                 intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
4336         }
4337 }
4338 #endif
4339 
4340 static void send_panic_events(char *str)
4341 {
4342         struct kernel_ipmi_msg            msg;
4343         ipmi_smi_t                        intf;
4344         unsigned char                     data[16];
4345         struct ipmi_system_interface_addr *si;
4346         struct ipmi_addr                  addr;
4347 
4348         si = (struct ipmi_system_interface_addr *) &addr;
4349         si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
4350         si->channel = IPMI_BMC_CHANNEL;
4351         si->lun = 0;
4352 
4353         /* Fill in an event telling that we have failed. */
4354         msg.netfn = 0x04; /* Sensor or Event. */
4355         msg.cmd = 2; /* Platform event command. */
4356         msg.data = data;
4357         msg.data_len = 8;
4358         data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */
4359         data[1] = 0x03; /* This is for IPMI 1.0. */
4360         data[2] = 0x20; /* OS Critical Stop, IPMI table 36-3 */
4361         data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */
4362         data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */
4363 
4364         /*
4365          * Put a few breadcrumbs in.  Hopefully later we can add more things
4366          * to make the panic events more useful.
4367          */
4368         if (str) {
4369                 data[3] = str[0];
4370                 data[6] = str[1];
4371                 data[7] = str[2];
4372         }
4373 
4374         /* For every registered interface, send the event. */
4375         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4376                 if (!intf->handlers)
4377                         /* Interface is not ready. */
4378                         continue;
4379 
4380                 /* Send the event announcing the panic. */
4381                 ipmi_panic_request_and_wait(intf, &addr, &msg);
4382         }
4383 
4384 #ifdef CONFIG_IPMI_PANIC_STRING
4385         /*
4386          * On every interface, dump a bunch of OEM event holding the
4387          * string.
4388          */
4389         if (!str)
4390                 return;
4391 
4392         /* For every registered interface, send the event. */
4393         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4394                 char                  *p = str;
4395                 struct ipmi_ipmb_addr *ipmb;
4396                 int                   j;
4397 
4398                 if (intf->intf_num == -1)
4399                         /* Interface was not ready yet. */
4400                         continue;
4401 
4402                 /*
4403                  * intf_num is used as an marker to tell if the
4404                  * interface is valid.  Thus we need a read barrier to
4405                  * make sure data fetched before checking intf_num
4406                  * won't be used.
4407                  */
4408                 smp_rmb();
4409 
4410                 /*
4411                  * First job here is to figure out where to send the
4412                  * OEM events.  There's no way in IPMI to send OEM
4413                  * events using an event send command, so we have to
4414                  * find the SEL to put them in and stick them in
4415                  * there.
4416                  */
4417 
4418                 /* Get capabilities from the get device id. */
4419                 intf->local_sel_device = 0;
4420                 intf->local_event_generator = 0;
4421                 intf->event_receiver = 0;
4422 
4423                 /* Request the device info from the local MC. */
4424                 msg.netfn = IPMI_NETFN_APP_REQUEST;
4425                 msg.cmd = IPMI_GET_DEVICE_ID_CMD;
4426                 msg.data = NULL;
4427                 msg.data_len = 0;
4428                 intf->null_user_handler = device_id_fetcher;
4429                 ipmi_panic_request_and_wait(intf, &addr, &msg);
4430 
4431                 if (intf->local_event_generator) {
4432                         /* Request the event receiver from the local MC. */
4433                         msg.netfn = IPMI_NETFN_SENSOR_EVENT_REQUEST;
4434                         msg.cmd = IPMI_GET_EVENT_RECEIVER_CMD;
4435                         msg.data = NULL;
4436                         msg.data_len = 0;
4437                         intf->null_user_handler = event_receiver_fetcher;
4438                         ipmi_panic_request_and_wait(intf, &addr, &msg);
4439                 }
4440                 intf->null_user_handler = NULL;
4441 
4442                 /*
4443                  * Validate the event receiver.  The low bit must not
4444                  * be 1 (it must be a valid IPMB address), it cannot
4445                  * be zero, and it must not be my address.
4446                  */
4447                 if (((intf->event_receiver & 1) == 0)
4448                     && (intf->event_receiver != 0)
4449                     && (intf->event_receiver != intf->channels[0].address)) {
4450                         /*
4451                          * The event receiver is valid, send an IPMB
4452                          * message.
4453                          */
4454                         ipmb = (struct ipmi_ipmb_addr *) &addr;
4455                         ipmb->addr_type = IPMI_IPMB_ADDR_TYPE;
4456                         ipmb->channel = 0; /* FIXME - is this right? */
4457                         ipmb->lun = intf->event_receiver_lun;
4458                         ipmb->slave_addr = intf->event_receiver;
4459                 } else if (intf->local_sel_device) {
4460                         /*
4461                          * The event receiver was not valid (or was
4462                          * me), but I am an SEL device, just dump it
4463                          * in my SEL.
4464                          */
4465                         si = (struct ipmi_system_interface_addr *) &addr;
4466                         si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
4467                         si->channel = IPMI_BMC_CHANNEL;
4468                         si->lun = 0;
4469                 } else
4470                         continue; /* No where to send the event. */
4471 
4472                 msg.netfn = IPMI_NETFN_STORAGE_REQUEST; /* Storage. */
4473                 msg.cmd = IPMI_ADD_SEL_ENTRY_CMD;
4474                 msg.data = data;
4475                 msg.data_len = 16;
4476 
4477                 j = 0;
4478                 while (*p) {
4479                         int size = strlen(p);
4480 
4481                         if (size > 11)
4482                                 size = 11;
4483                         data[0] = 0;
4484                         data[1] = 0;
4485                         data[2] = 0xf0; /* OEM event without timestamp. */
4486                         data[3] = intf->channels[0].address;
4487                         data[4] = j++; /* sequence # */
4488                         /*
4489                          * Always give 11 bytes, so strncpy will fill
4490                          * it with zeroes for me.
4491                          */
4492                         strncpy(data+5, p, 11);
4493                         p += size;
4494 
4495                         ipmi_panic_request_and_wait(intf, &addr, &msg);
4496                 }
4497         }
4498 #endif /* CONFIG_IPMI_PANIC_STRING */
4499 }
4500 #endif /* CONFIG_IPMI_PANIC_EVENT */
4501 
4502 static int has_panicked;
4503 
4504 static int panic_event(struct notifier_block *this,
4505                        unsigned long         event,
4506                        void                  *ptr)
4507 {
4508         ipmi_smi_t intf;
4509 
4510         if (has_panicked)
4511                 return NOTIFY_DONE;
4512         has_panicked = 1;
4513 
4514         /* For every registered interface, set it to run to completion. */
4515         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4516                 if (!intf->handlers)
4517                         /* Interface is not ready. */
4518                         continue;
4519 
4520                 /*
4521                  * If we were interrupted while locking xmit_msgs_lock or
4522                  * waiting_rcv_msgs_lock, the corresponding list may be
4523                  * corrupted.  In this case, drop items on the list for
4524                  * the safety.
4525                  */
4526                 if (!spin_trylock(&intf->xmit_msgs_lock)) {
4527                         INIT_LIST_HEAD(&intf->xmit_msgs);
4528                         INIT_LIST_HEAD(&intf->hp_xmit_msgs);
4529                 } else
4530                         spin_unlock(&intf->xmit_msgs_lock);
4531 
4532                 if (!spin_trylock(&intf->waiting_rcv_msgs_lock))
4533                         INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
4534                 else
4535                         spin_unlock(&intf->waiting_rcv_msgs_lock);
4536 
4537                 intf->run_to_completion = 1;
4538                 intf->handlers->set_run_to_completion(intf->send_info, 1);
4539         }
4540 
4541 #ifdef CONFIG_IPMI_PANIC_EVENT
4542         send_panic_events(ptr);
4543 #endif
4544 
4545         return NOTIFY_DONE;
4546 }
4547 
4548 static struct notifier_block panic_block = {
4549         .notifier_call  = panic_event,
4550         .next           = NULL,
4551         .priority       = 200   /* priority: INT_MAX >= x >= 0 */
4552 };
4553 
4554 static int ipmi_init_msghandler(void)
4555 {
4556         int rv;
4557 
4558         if (initialized)
4559                 return 0;
4560 
4561         rv = driver_register(&ipmidriver.driver);
4562         if (rv) {
4563                 printk(KERN_ERR PFX "Could not register IPMI driver\n");
4564                 return rv;
4565         }
4566 
4567         printk(KERN_INFO "ipmi message handler version "
4568                IPMI_DRIVER_VERSION "\n");
4569 
4570 #ifdef CONFIG_PROC_FS
4571         proc_ipmi_root = proc_mkdir("ipmi", NULL);
4572         if (!proc_ipmi_root) {
4573             printk(KERN_ERR PFX "Unable to create IPMI proc dir");
4574             driver_unregister(&ipmidriver.driver);
4575             return -ENOMEM;
4576         }
4577 
4578 #endif /* CONFIG_PROC_FS */
4579 
4580         setup_timer(&ipmi_timer, ipmi_timeout, 0);
4581         mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
4582 
4583         atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
4584 
4585         initialized = 1;
4586 
4587         return 0;
4588 }
4589 
4590 static int __init ipmi_init_msghandler_mod(void)
4591 {
4592         ipmi_init_msghandler();
4593         return 0;
4594 }
4595 
4596 static void __exit cleanup_ipmi(void)
4597 {
4598         int count;
4599 
4600         if (!initialized)
4601                 return;
4602 
4603         atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block);
4604 
4605         /*
4606          * This can't be called if any interfaces exist, so no worry
4607          * about shutting down the interfaces.
4608          */
4609 
4610         /*
4611          * Tell the timer to stop, then wait for it to stop.  This
4612          * avoids problems with race conditions removing the timer
4613          * here.
4614          */
4615         atomic_inc(&stop_operation);
4616         del_timer_sync(&ipmi_timer);
4617 
4618 #ifdef CONFIG_PROC_FS
4619         proc_remove(proc_ipmi_root);
4620 #endif /* CONFIG_PROC_FS */
4621 
4622         driver_unregister(&ipmidriver.driver);
4623 
4624         initialized = 0;
4625 
4626         /* Check for buffer leaks. */
4627         count = atomic_read(&smi_msg_inuse_count);
4628         if (count != 0)
4629                 printk(KERN_WARNING PFX "SMI message count %d at exit\n",
4630                        count);
4631         count = atomic_read(&recv_msg_inuse_count);
4632         if (count != 0)
4633                 printk(KERN_WARNING PFX "recv message count %d at exit\n",
4634                        count);
4635 }
4636 module_exit(cleanup_ipmi);
4637 
4638 module_init(ipmi_init_msghandler_mod);
4639 MODULE_LICENSE("GPL");
4640 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
4641 MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI"
4642                    " interface.");
4643 MODULE_VERSION(IPMI_DRIVER_VERSION);
4644 

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