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 <asm/system.h>
  37 #include <linux/sched.h>
  38 #include <linux/poll.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
  49 #define PFX "IPMI message handler: "
  50
  51 #define IPMI_DRIVER_VERSION "39.1"
  52
  53 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
  54 static int ipmi_init_msghandler(void);
  55
  56 static int initialized;
  57
  58 #ifdef CONFIG_PROC_FS
  59 static struct proc_dir_entry *proc_ipmi_root;
  60 #endif /* CONFIG_PROC_FS */
  61
  62 /* Remain in auto-maintenance mode for this amount of time (in ms). */
  63 #define IPMI_MAINTENANCE_MODE_TIMEOUT 30000
  64
  65 #define MAX_EVENTS_IN_QUEUE     25
  66
  67 /* Don't let a message sit in a queue forever, always time it with at lest
  68    the max message timer.  This is in milliseconds. */
  69 #define MAX_MSG_TIMEOUT         60000
  70
  71
  72 /*
  73  * The main "user" data structure.
  74  */
  75 struct ipmi_user
  76 {
  77         struct list_head link;
  78
  79         /* Set to "0" when the user is destroyed. */
  80         int valid;
  81
  82         struct kref refcount;
  83
  84         /* The upper layer that handles receive messages. */
  85         struct ipmi_user_hndl *handler;
  86         void             *handler_data;
  87
  88         /* The interface this user is bound to. */
  89         ipmi_smi_t intf;
  90
  91         /* Does this interface receive IPMI events? */
  92         int gets_events;
  93 };
  94
  95 struct cmd_rcvr
  96 {
  97         struct list_head link;
  98
  99         ipmi_user_t   user;
 100         unsigned char netfn;
 101         unsigned char cmd;
 102         unsigned int  chans;
 103
 104         /*
 105          * This is used to form a linked lised during mass deletion.
 106          * Since this is in an RCU list, we cannot use the link above
 107          * or change any data until the RCU period completes.  So we
 108          * use this next variable during mass deletion so we can have
 109          * a list and don't have to wait and restart the search on
 110          * every individual deletion of a command. */
 111         struct cmd_rcvr *next;
 112 };
 113
 114 struct seq_table
 115 {
 116         unsigned int         inuse : 1;
 117         unsigned int         broadcast : 1;
 118
 119         unsigned long        timeout;
 120         unsigned long        orig_timeout;
 121         unsigned int         retries_left;
 122
 123         /* To verify on an incoming send message response that this is
 124            the message that the response is for, we keep a sequence id
 125            and increment it every time we send a message. */
 126         long                 seqid;
 127
 128         /* This is held so we can properly respond to the message on a
 129            timeout, and it is used to hold the temporary data for
 130            retransmission, too. */
 131         struct ipmi_recv_msg *recv_msg;
 132 };
 133
 134 /* Store the information in a msgid (long) to allow us to find a
 135    sequence table entry from the msgid. */
 136 #define STORE_SEQ_IN_MSGID(seq, seqid) (((seq&0xff)<<26) | (seqid&0x3ffffff))
 137
 138 #define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \
 139         do {                                                            \
 140                 seq = ((msgid >> 26) & 0x3f);                           \
 141                 seqid = (msgid & 0x3fffff);                             \
 142         } while (0)
 143
 144 #define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3fffff)
 145
 146 struct ipmi_channel
 147 {
 148         unsigned char medium;
 149         unsigned char protocol;
 150
 151         /* My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
 152            but may be changed by the user. */
 153         unsigned char address;
 154
 155         /* My LUN.  This should generally stay the SMS LUN, but just in
 156            case... */
 157         unsigned char lun;
 158 };
 159
 160 #ifdef CONFIG_PROC_FS
 161 struct ipmi_proc_entry
 162 {
 163         char                   *name;
 164         struct ipmi_proc_entry *next;
 165 };
 166 #endif
 167
 168 struct bmc_device
 169 {
 170         struct platform_device *dev;
 171         struct ipmi_device_id  id;
 172         unsigned char          guid[16];
 173         int                    guid_set;
 174
 175         struct kref            refcount;
 176
 177         /* bmc device attributes */
 178         struct device_attribute device_id_attr;
 179         struct device_attribute provides_dev_sdrs_attr;
 180         struct device_attribute revision_attr;
 181         struct device_attribute firmware_rev_attr;
 182         struct device_attribute version_attr;
 183         struct device_attribute add_dev_support_attr;
 184         struct device_attribute manufacturer_id_attr;
 185         struct device_attribute product_id_attr;
 186         struct device_attribute guid_attr;
 187         struct device_attribute aux_firmware_rev_attr;
 188 };
 189
 190 #define IPMI_IPMB_NUM_SEQ       64
 191 #define IPMI_MAX_CHANNELS       16
 192 struct ipmi_smi
 193 {
 194         /* What interface number are we? */
 195         int intf_num;
 196
 197         struct kref refcount;
 198
 199         /* Used for a list of interfaces. */
 200         struct list_head link;
 201
 202         /* The list of upper layers that are using me.  seq_lock
 203          * protects this. */
 204         struct list_head users;
 205
 206         /* Information to supply to users. */
 207         unsigned char ipmi_version_major;
 208         unsigned char ipmi_version_minor;
 209
 210         /* Used for wake ups at startup. */
 211         wait_queue_head_t waitq;
 212
 213         struct bmc_device *bmc;
 214         char *my_dev_name;
 215         char *sysfs_name;
 216
 217         /* This is the lower-layer's sender routine.  Note that you
 218          * must either be holding the ipmi_interfaces_mutex or be in
 219          * an umpreemptible region to use this.  You must fetch the
 220          * value into a local variable and make sure it is not NULL. */
 221         struct ipmi_smi_handlers *handlers;
 222         void                     *send_info;
 223
 224 #ifdef CONFIG_PROC_FS
 225         /* A list of proc entries for this interface.  This does not
 226            need a lock, only one thread creates it and only one thread
 227            destroys it. */
 228         spinlock_t             proc_entry_lock;
 229         struct ipmi_proc_entry *proc_entries;
 230 #endif
 231
 232         /* Driver-model device for the system interface. */
 233         struct device          *si_dev;
 234
 235         /* A table of sequence numbers for this interface.  We use the
 236            sequence numbers for IPMB messages that go out of the
 237            interface to match them up with their responses.  A routine
 238            is called periodically to time the items in this list. */
 239         spinlock_t       seq_lock;
 240         struct seq_table seq_table[IPMI_IPMB_NUM_SEQ];
 241         int curr_seq;
 242
 243         /* Messages that were delayed for some reason (out of memory,
 244            for instance), will go in here to be processed later in a
 245            periodic timer interrupt. */
 246         spinlock_t       waiting_msgs_lock;
 247         struct list_head waiting_msgs;
 248
 249         /* The list of command receivers that are registered for commands
 250            on this interface. */
 251         struct mutex     cmd_rcvrs_mutex;
 252         struct list_head cmd_rcvrs;
 253
 254         /* Events that were queues because no one was there to receive
 255            them. */
 256         spinlock_t       events_lock; /* For dealing with event stuff. */
 257         struct list_head waiting_events;
 258         unsigned int     waiting_events_count; /* How many events in queue? */
 259         int              delivering_events;
 260
 261         /* The event receiver for my BMC, only really used at panic
 262            shutdown as a place to store this. */
 263         unsigned char event_receiver;
 264         unsigned char event_receiver_lun;
 265         unsigned char local_sel_device;
 266         unsigned char local_event_generator;
 267
 268         /* For handling of maintenance mode. */
 269         int maintenance_mode;
 270         int maintenance_mode_enable;
 271         int auto_maintenance_timeout;
 272         spinlock_t maintenance_mode_lock; /* Used in a timer... */
 273
 274         /* A cheap hack, if this is non-null and a message to an
 275            interface comes in with a NULL user, call this routine with
 276            it.  Note that the message will still be freed by the
 277            caller.  This only works on the system interface. */
 278         void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);
 279
 280         /* When we are scanning the channels for an SMI, this will
 281            tell which channel we are scanning. */
 282         int curr_channel;
 283
 284         /* Channel information */
 285         struct ipmi_channel channels[IPMI_MAX_CHANNELS];
 286
 287         /* Proc FS stuff. */
 288         struct proc_dir_entry *proc_dir;
 289         char                  proc_dir_name[10];
 290
 291         spinlock_t   counter_lock; /* For making counters atomic. */
 292
 293         /* Commands we got that were invalid. */
 294         unsigned int sent_invalid_commands;
 295
 296         /* Commands we sent to the MC. */
 297         unsigned int sent_local_commands;
 298         /* Responses from the MC that were delivered to a user. */
 299         unsigned int handled_local_responses;
 300         /* Responses from the MC that were not delivered to a user. */
 301         unsigned int unhandled_local_responses;
 302
 303         /* Commands we sent out to the IPMB bus. */
 304         unsigned int sent_ipmb_commands;
 305         /* Commands sent on the IPMB that had errors on the SEND CMD */
 306         unsigned int sent_ipmb_command_errs;
 307         /* Each retransmit increments this count. */
 308         unsigned int retransmitted_ipmb_commands;
 309         /* When a message times out (runs out of retransmits) this is
 310            incremented. */
 311         unsigned int timed_out_ipmb_commands;
 312
 313         /* This is like above, but for broadcasts.  Broadcasts are
 314            *not* included in the above count (they are expected to
 315            time out). */
 316         unsigned int timed_out_ipmb_broadcasts;
 317
 318         /* Responses I have sent to the IPMB bus. */
 319         unsigned int sent_ipmb_responses;
 320
 321         /* The response was delivered to the user. */
 322         unsigned int handled_ipmb_responses;
 323         /* The response had invalid data in it. */
 324         unsigned int invalid_ipmb_responses;
 325         /* The response didn't have anyone waiting for it. */
 326         unsigned int unhandled_ipmb_responses;
 327
 328         /* Commands we sent out to the IPMB bus. */
 329         unsigned int sent_lan_commands;
 330         /* Commands sent on the IPMB that had errors on the SEND CMD */
 331         unsigned int sent_lan_command_errs;
 332         /* Each retransmit increments this count. */
 333         unsigned int retransmitted_lan_commands;
 334         /* When a message times out (runs out of retransmits) this is
 335            incremented. */
 336         unsigned int timed_out_lan_commands;
 337
 338         /* Responses I have sent to the IPMB bus. */
 339         unsigned int sent_lan_responses;
 340
 341         /* The response was delivered to the user. */
 342         unsigned int handled_lan_responses;
 343         /* The response had invalid data in it. */
 344         unsigned int invalid_lan_responses;
 345         /* The response didn't have anyone waiting for it. */
 346         unsigned int unhandled_lan_responses;
 347
 348         /* The command was delivered to the user. */
 349         unsigned int handled_commands;
 350         /* The command had invalid data in it. */
 351         unsigned int invalid_commands;
 352         /* The command didn't have anyone waiting for it. */
 353         unsigned int unhandled_commands;
 354
 355         /* Invalid data in an event. */
 356         unsigned int invalid_events;
 357         /* Events that were received with the proper format. */
 358         unsigned int events;
 359 };
 360 #define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev)
 361
 362 /**
 363  * The driver model view of the IPMI messaging driver.
 364  */
 365 static struct device_driver ipmidriver = {
 366         .name = "ipmi",
 367         .bus = &platform_bus_type
 368 };
 369 static DEFINE_MUTEX(ipmidriver_mutex);
 370
 371 static struct list_head ipmi_interfaces = LIST_HEAD_INIT(ipmi_interfaces);
 372 static DEFINE_MUTEX(ipmi_interfaces_mutex);
 373
 374 /* List of watchers that want to know when smi's are added and
 375    deleted. */
 376 static struct list_head smi_watchers = LIST_HEAD_INIT(smi_watchers);
 377 static DEFINE_MUTEX(smi_watchers_mutex);
 378
 379
 380 static void free_recv_msg_list(struct list_head *q)
 381 {
 382         struct ipmi_recv_msg *msg, *msg2;
 383
 384         list_for_each_entry_safe(msg, msg2, q, link) {
 385                 list_del(&msg->link);
 386                 ipmi_free_recv_msg(msg);
 387         }
 388 }
 389
 390 static void free_smi_msg_list(struct list_head *q)
 391 {
 392         struct ipmi_smi_msg *msg, *msg2;
 393
 394         list_for_each_entry_safe(msg, msg2, q, link) {
 395                 list_del(&msg->link);
 396                 ipmi_free_smi_msg(msg);
 397         }
 398 }
 399
 400 static void clean_up_interface_data(ipmi_smi_t intf)
 401 {
 402         int              i;
 403         struct cmd_rcvr  *rcvr, *rcvr2;
 404         struct list_head list;
 405
 406         free_smi_msg_list(&intf->waiting_msgs);
 407         free_recv_msg_list(&intf->waiting_events);
 408
 409         /* Wholesale remove all the entries from the list in the
 410          * interface and wait for RCU to know that none are in use. */
 411         mutex_lock(&intf->cmd_rcvrs_mutex);
 412         list_add_rcu(&list, &intf->cmd_rcvrs);
 413         list_del_rcu(&intf->cmd_rcvrs);
 414         mutex_unlock(&intf->cmd_rcvrs_mutex);
 415         synchronize_rcu();
 416
 417         list_for_each_entry_safe(rcvr, rcvr2, &list, link)
 418                 kfree(rcvr);
 419
 420         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
 421                 if ((intf->seq_table[i].inuse)
 422                     && (intf->seq_table[i].recv_msg))
 423                 {
 424                         ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
 425                 }
 426         }
 427 }
 428
 429 static void intf_free(struct kref *ref)
 430 {
 431         ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount);
 432
 433         clean_up_interface_data(intf);
 434         kfree(intf);
 435 }
 436
 437 struct watcher_entry {
 438         int              intf_num;
 439         ipmi_smi_t       intf;
 440         struct list_head link;
 441 };
 442
 443 int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
 444 {
 445         ipmi_smi_t intf;
 446         struct list_head to_deliver = LIST_HEAD_INIT(to_deliver);
 447         struct watcher_entry *e, *e2;
 448
 449         mutex_lock(&smi_watchers_mutex);
 450
 451         mutex_lock(&ipmi_interfaces_mutex);
 452
 453         /* Build a list of things to deliver. */
 454         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
 455                 if (intf->intf_num == -1)
 456                         continue;
 457                 e = kmalloc(sizeof(*e), GFP_KERNEL);
 458                 if (!e)
 459                         goto out_err;
 460                 kref_get(&intf->refcount);
 461                 e->intf = intf;
 462                 e->intf_num = intf->intf_num;
 463                 list_add_tail(&e->link, &to_deliver);
 464         }
 465
 466         /* We will succeed, so add it to the list. */
 467         list_add(&watcher->link, &smi_watchers);
 468
 469         mutex_unlock(&ipmi_interfaces_mutex);
 470
 471         list_for_each_entry_safe(e, e2, &to_deliver, link) {
 472                 list_del(&e->link);
 473                 watcher->new_smi(e->intf_num, e->intf->si_dev);
 474                 kref_put(&e->intf->refcount, intf_free);
 475                 kfree(e);
 476         }
 477
 478         mutex_unlock(&smi_watchers_mutex);
 479
 480         return 0;
 481
 482  out_err:
 483         mutex_unlock(&ipmi_interfaces_mutex);
 484         mutex_unlock(&smi_watchers_mutex);
 485         list_for_each_entry_safe(e, e2, &to_deliver, link) {
 486                 list_del(&e->link);
 487                 kref_put(&e->intf->refcount, intf_free);
 488                 kfree(e);
 489         }
 490         return -ENOMEM;
 491 }
 492
 493 int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher)
 494 {
 495         mutex_lock(&smi_watchers_mutex);
 496         list_del(&(watcher->link));
 497         mutex_unlock(&smi_watchers_mutex);
 498         return 0;
 499 }
 500
 501 /*
 502  * Must be called with smi_watchers_mutex held.
 503  */
 504 static void
 505 call_smi_watchers(int i, struct device *dev)
 506 {
 507         struct ipmi_smi_watcher *w;
 508
 509         list_for_each_entry(w, &smi_watchers, link) {
 510                 if (try_module_get(w->owner)) {
 511                         w->new_smi(i, dev);
 512                         module_put(w->owner);
 513                 }
 514         }
 515 }
 516
 517 static int
 518 ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
 519 {
 520         if (addr1->addr_type != addr2->addr_type)
 521                 return 0;
 522
 523         if (addr1->channel != addr2->channel)
 524                 return 0;
 525
 526         if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
 527                 struct ipmi_system_interface_addr *smi_addr1
 528                     = (struct ipmi_system_interface_addr *) addr1;
 529                 struct ipmi_system_interface_addr *smi_addr2
 530                     = (struct ipmi_system_interface_addr *) addr2;
 531                 return (smi_addr1->lun == smi_addr2->lun);
 532         }
 533
 534         if ((addr1->addr_type == IPMI_IPMB_ADDR_TYPE)
 535             || (addr1->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
 536         {
 537                 struct ipmi_ipmb_addr *ipmb_addr1
 538                     = (struct ipmi_ipmb_addr *) addr1;
 539                 struct ipmi_ipmb_addr *ipmb_addr2
 540                     = (struct ipmi_ipmb_addr *) addr2;
 541
 542                 return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr)
 543                         && (ipmb_addr1->lun == ipmb_addr2->lun));
 544         }
 545
 546         if (addr1->addr_type == IPMI_LAN_ADDR_TYPE) {
 547                 struct ipmi_lan_addr *lan_addr1
 548                         = (struct ipmi_lan_addr *) addr1;
 549                 struct ipmi_lan_addr *lan_addr2
 550                     = (struct ipmi_lan_addr *) addr2;
 551
 552                 return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID)
 553                         && (lan_addr1->local_SWID == lan_addr2->local_SWID)
 554                         && (lan_addr1->session_handle
 555                             == lan_addr2->session_handle)
 556                         && (lan_addr1->lun == lan_addr2->lun));
 557         }
 558
 559         return 1;
 560 }
 561
 562 int ipmi_validate_addr(struct ipmi_addr *addr, int len)
 563 {
 564         if (len < sizeof(struct ipmi_system_interface_addr)) {
 565                 return -EINVAL;
 566         }
 567
 568         if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
 569                 if (addr->channel != IPMI_BMC_CHANNEL)
 570                         return -EINVAL;
 571                 return 0;
 572         }
 573
 574         if ((addr->channel == IPMI_BMC_CHANNEL)
 575             || (addr->channel >= IPMI_MAX_CHANNELS)
 576             || (addr->channel < 0))
 577                 return -EINVAL;
 578
 579         if ((addr->addr_type == IPMI_IPMB_ADDR_TYPE)
 580             || (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
 581         {
 582                 if (len < sizeof(struct ipmi_ipmb_addr)) {
 583                         return -EINVAL;
 584                 }
 585                 return 0;
 586         }
 587
 588         if (addr->addr_type == IPMI_LAN_ADDR_TYPE) {
 589                 if (len < sizeof(struct ipmi_lan_addr)) {
 590                         return -EINVAL;
 591                 }
 592                 return 0;
 593         }
 594
 595         return -EINVAL;
 596 }
 597
 598 unsigned int ipmi_addr_length(int addr_type)
 599 {
 600         if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
 601                 return sizeof(struct ipmi_system_interface_addr);
 602
 603         if ((addr_type == IPMI_IPMB_ADDR_TYPE)
 604             || (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
 605         {
 606                 return sizeof(struct ipmi_ipmb_addr);
 607         }
 608
 609         if (addr_type == IPMI_LAN_ADDR_TYPE)
 610                 return sizeof(struct ipmi_lan_addr);
 611
 612         return 0;
 613 }
 614
 615 static void deliver_response(struct ipmi_recv_msg *msg)
 616 {
 617         if (!msg->user) {
 618                 ipmi_smi_t    intf = msg->user_msg_data;
 619                 unsigned long flags;
 620
 621                 /* Special handling for NULL users. */
 622                 if (intf->null_user_handler) {
 623                         intf->null_user_handler(intf, msg);
 624                         spin_lock_irqsave(&intf->counter_lock, flags);
 625                         intf->handled_local_responses++;
 626                         spin_unlock_irqrestore(&intf->counter_lock, flags);
 627                 } else {
 628                         /* No handler, so give up. */
 629                         spin_lock_irqsave(&intf->counter_lock, flags);
 630                         intf->unhandled_local_responses++;
 631                         spin_unlock_irqrestore(&intf->counter_lock, flags);
 632                 }
 633                 ipmi_free_recv_msg(msg);
 634         } else {
 635                 ipmi_user_t user = msg->user;
 636                 user->handler->ipmi_recv_hndl(msg, user->handler_data);
 637         }
 638 }
 639
 640 static void
 641 deliver_err_response(struct ipmi_recv_msg *msg, int err)
 642 {
 643         msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
 644         msg->msg_data[0] = err;
 645         msg->msg.netfn |= 1; /* Convert to a response. */
 646         msg->msg.data_len = 1;
 647         msg->msg.data = msg->msg_data;
 648         deliver_response(msg);
 649 }
 650
 651 /* Find the next sequence number not being used and add the given
 652    message with the given timeout to the sequence table.  This must be
 653    called with the interface's seq_lock held. */
 654 static int intf_next_seq(ipmi_smi_t           intf,
 655                          struct ipmi_recv_msg *recv_msg,
 656                          unsigned long        timeout,
 657                          int                  retries,
 658                          int                  broadcast,
 659                          unsigned char        *seq,
 660                          long                 *seqid)
 661 {
 662         int          rv = 0;
 663         unsigned int i;
 664
 665         for (i = intf->curr_seq;
 666              (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq;
 667              i = (i+1)%IPMI_IPMB_NUM_SEQ)
 668         {
 669                 if (!intf->seq_table[i].inuse)
 670                         break;
 671         }
 672
 673         if (!intf->seq_table[i].inuse) {
 674                 intf->seq_table[i].recv_msg = recv_msg;
 675
 676                 /* Start with the maximum timeout, when the send response
 677                    comes in we will start the real timer. */
 678                 intf->seq_table[i].timeout = MAX_MSG_TIMEOUT;
 679                 intf->seq_table[i].orig_timeout = timeout;
 680                 intf->seq_table[i].retries_left = retries;
 681                 intf->seq_table[i].broadcast = broadcast;
 682                 intf->seq_table[i].inuse = 1;
 683                 intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid);
 684                 *seq = i;
 685                 *seqid = intf->seq_table[i].seqid;
 686                 intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ;
 687         } else {
 688                 rv = -EAGAIN;
 689         }
 690
 691         return rv;
 692 }
 693
 694 /* Return the receive message for the given sequence number and
 695    release the sequence number so it can be reused.  Some other data
 696    is passed in to be sure the message matches up correctly (to help
 697    guard against message coming in after their timeout and the
 698    sequence number being reused). */
 699 static int intf_find_seq(ipmi_smi_t           intf,
 700                          unsigned char        seq,
 701                          short                channel,
 702                          unsigned char        cmd,
 703                          unsigned char        netfn,
 704                          struct ipmi_addr     *addr,
 705                          struct ipmi_recv_msg **recv_msg)
 706 {
 707         int           rv = -ENODEV;
 708         unsigned long flags;
 709
 710         if (seq >= IPMI_IPMB_NUM_SEQ)
 711                 return -EINVAL;
 712
 713         spin_lock_irqsave(&(intf->seq_lock), flags);
 714         if (intf->seq_table[seq].inuse) {
 715                 struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg;
 716
 717                 if ((msg->addr.channel == channel)
 718                     && (msg->msg.cmd == cmd)
 719                     && (msg->msg.netfn == netfn)
 720                     && (ipmi_addr_equal(addr, &(msg->addr))))
 721                 {
 722                         *recv_msg = msg;
 723                         intf->seq_table[seq].inuse = 0;
 724                         rv = 0;
 725                 }
 726         }
 727         spin_unlock_irqrestore(&(intf->seq_lock), flags);
 728
 729         return rv;
 730 }
 731
 732
 733 /* Start the timer for a specific sequence table entry. */
 734 static int intf_start_seq_timer(ipmi_smi_t intf,
 735                                 long       msgid)
 736 {
 737         int           rv = -ENODEV;
 738         unsigned long flags;
 739         unsigned char seq;
 740         unsigned long seqid;
 741
 742
 743         GET_SEQ_FROM_MSGID(msgid, seq, seqid);
 744
 745         spin_lock_irqsave(&(intf->seq_lock), flags);
 746         /* We do this verification because the user can be deleted
 747            while a message is outstanding. */
 748         if ((intf->seq_table[seq].inuse)
 749             && (intf->seq_table[seq].seqid == seqid))
 750         {
 751                 struct seq_table *ent = &(intf->seq_table[seq]);
 752                 ent->timeout = ent->orig_timeout;
 753                 rv = 0;
 754         }
 755         spin_unlock_irqrestore(&(intf->seq_lock), flags);
 756
 757         return rv;
 758 }
 759
 760 /* Got an error for the send message for a specific sequence number. */
 761 static int intf_err_seq(ipmi_smi_t   intf,
 762                         long         msgid,
 763                         unsigned int err)
 764 {
 765         int                  rv = -ENODEV;
 766         unsigned long        flags;
 767         unsigned char        seq;
 768         unsigned long        seqid;
 769         struct ipmi_recv_msg *msg = NULL;
 770
 771
 772         GET_SEQ_FROM_MSGID(msgid, seq, seqid);
 773
 774         spin_lock_irqsave(&(intf->seq_lock), flags);
 775         /* We do this verification because the user can be deleted
 776            while a message is outstanding. */
 777         if ((intf->seq_table[seq].inuse)
 778             && (intf->seq_table[seq].seqid == seqid))
 779         {
 780                 struct seq_table *ent = &(intf->seq_table[seq]);
 781
 782                 ent->inuse = 0;
 783                 msg = ent->recv_msg;
 784                 rv = 0;
 785         }
 786         spin_unlock_irqrestore(&(intf->seq_lock), flags);
 787
 788         if (msg)
 789                 deliver_err_response(msg, err);
 790
 791         return rv;
 792 }
 793
 794
 795 int ipmi_create_user(unsigned int          if_num,
 796                      struct ipmi_user_hndl *handler,
 797                      void                  *handler_data,
 798                      ipmi_user_t           *user)
 799 {
 800         unsigned long flags;
 801         ipmi_user_t   new_user;
 802         int           rv = 0;
 803         ipmi_smi_t    intf;
 804
 805         /* There is no module usecount here, because it's not
 806            required.  Since this can only be used by and called from
 807            other modules, they will implicitly use this module, and
 808            thus this can't be removed unless the other modules are
 809            removed. */
 810
 811         if (handler == NULL)
 812                 return -EINVAL;
 813
 814         /* Make sure the driver is actually initialized, this handles
 815            problems with initialization order. */
 816         if (!initialized) {
 817                 rv = ipmi_init_msghandler();
 818                 if (rv)
 819                         return rv;
 820
 821                 /* The init code doesn't return an error if it was turned
 822                    off, but it won't initialize.  Check that. */
 823                 if (!initialized)
 824                         return -ENODEV;
 825         }
 826
 827         new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
 828         if (!new_user)
 829                 return -ENOMEM;
 830
 831         mutex_lock(&ipmi_interfaces_mutex);
 832         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
 833                 if (intf->intf_num == if_num)
 834                         goto found;
 835         }
 836         /* Not found, return an error */
 837         rv = -EINVAL;
 838         goto out_kfree;
 839
 840  found:
 841         /* Note that each existing user holds a refcount to the interface. */
 842         kref_get(&intf->refcount);
 843
 844         kref_init(&new_user->refcount);
 845         new_user->handler = handler;
 846         new_user->handler_data = handler_data;
 847         new_user->intf = intf;
 848         new_user->gets_events = 0;
 849
 850         if (!try_module_get(intf->handlers->owner)) {
 851                 rv = -ENODEV;
 852                 goto out_kref;
 853         }
 854
 855         if (intf->handlers->inc_usecount) {
 856                 rv = intf->handlers->inc_usecount(intf->send_info);
 857                 if (rv) {
 858                         module_put(intf->handlers->owner);
 859                         goto out_kref;
 860                 }
 861         }
 862
 863         /* Hold the lock so intf->handlers is guaranteed to be good
 864          * until now */
 865         mutex_unlock(&ipmi_interfaces_mutex);
 866
 867         new_user->valid = 1;
 868         spin_lock_irqsave(&intf->seq_lock, flags);
 869         list_add_rcu(&new_user->link, &intf->users);
 870         spin_unlock_irqrestore(&intf->seq_lock, flags);
 871         *user = new_user;
 872         return 0;
 873
 874 out_kref:
 875         kref_put(&intf->refcount, intf_free);
 876 out_kfree:
 877         mutex_unlock(&ipmi_interfaces_mutex);
 878         kfree(new_user);
 879         return rv;
 880 }
 881
 882 static void free_user(struct kref *ref)
 883 {
 884         ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
 885         kfree(user);
 886 }
 887
 888 int ipmi_destroy_user(ipmi_user_t user)
 889 {
 890         ipmi_smi_t       intf = user->intf;
 891         int              i;
 892         unsigned long    flags;
 893         struct cmd_rcvr  *rcvr;
 894         struct cmd_rcvr  *rcvrs = NULL;
 895
 896         user->valid = 0;
 897
 898         /* Remove the user from the interface's sequence table. */
 899         spin_lock_irqsave(&intf->seq_lock, flags);
 900         list_del_rcu(&user->link);
 901
 902         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
 903                 if (intf->seq_table[i].inuse
 904                     && (intf->seq_table[i].recv_msg->user == user))
 905                 {
 906                         intf->seq_table[i].inuse = 0;
 907                         ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
 908                 }
 909         }
 910         spin_unlock_irqrestore(&intf->seq_lock, flags);
 911
 912         /*
 913          * Remove the user from the command receiver's table.  First
 914          * we build a list of everything (not using the standard link,
 915          * since other things may be using it till we do
 916          * synchronize_rcu()) then free everything in that list.
 917          */
 918         mutex_lock(&intf->cmd_rcvrs_mutex);
 919         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
 920                 if (rcvr->user == user) {
 921                         list_del_rcu(&rcvr->link);
 922                         rcvr->next = rcvrs;
 923                         rcvrs = rcvr;
 924                 }
 925         }
 926         mutex_unlock(&intf->cmd_rcvrs_mutex);
 927         synchronize_rcu();
 928         while (rcvrs) {
 929                 rcvr = rcvrs;
 930                 rcvrs = rcvr->next;
 931                 kfree(rcvr);
 932         }
 933
 934         mutex_lock(&ipmi_interfaces_mutex);
 935         if (intf->handlers) {
 936                 module_put(intf->handlers->owner);
 937                 if (intf->handlers->dec_usecount)
 938                         intf->handlers->dec_usecount(intf->send_info);
 939         }
 940         mutex_unlock(&ipmi_interfaces_mutex);
 941
 942         kref_put(&intf->refcount, intf_free);
 943
 944         kref_put(&user->refcount, free_user);
 945
 946         return 0;
 947 }
 948
 949 void ipmi_get_version(ipmi_user_t   user,
 950                       unsigned char *major,
 951                       unsigned char *minor)
 952 {
 953         *major = user->intf->ipmi_version_major;
 954         *minor = user->intf->ipmi_version_minor;
 955 }
 956
 957 int ipmi_set_my_address(ipmi_user_t   user,
 958                         unsigned int  channel,
 959                         unsigned char address)
 960 {
 961         if (channel >= IPMI_MAX_CHANNELS)
 962                 return -EINVAL;
 963         user->intf->channels[channel].address = address;
 964         return 0;
 965 }
 966
 967 int ipmi_get_my_address(ipmi_user_t   user,
 968                         unsigned int  channel,
 969                         unsigned char *address)
 970 {
 971         if (channel >= IPMI_MAX_CHANNELS)
 972                 return -EINVAL;
 973         *address = user->intf->channels[channel].address;
 974         return 0;
 975 }
 976
 977 int ipmi_set_my_LUN(ipmi_user_t   user,
 978                     unsigned int  channel,
 979                     unsigned char LUN)
 980 {
 981         if (channel >= IPMI_MAX_CHANNELS)
 982                 return -EINVAL;
 983         user->intf->channels[channel].lun = LUN & 0x3;
 984         return 0;
 985 }
 986
 987 int ipmi_get_my_LUN(ipmi_user_t   user,
 988                     unsigned int  channel,
 989                     unsigned char *address)
 990 {
 991         if (channel >= IPMI_MAX_CHANNELS)
 992                 return -EINVAL;
 993         *address = user->intf->channels[channel].lun;
 994         return 0;
 995 }
 996
 997 int ipmi_get_maintenance_mode(ipmi_user_t user)
 998 {
 999         int           mode;
1000         unsigned long flags;
1001
1002         spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
1003         mode = user->intf->maintenance_mode;
1004         spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);
1005
1006         return mode;
1007 }
1008 EXPORT_SYMBOL(ipmi_get_maintenance_mode);
1009
1010 static void maintenance_mode_update(ipmi_smi_t intf)
1011 {
1012         if (intf->handlers->set_maintenance_mode)
1013                 intf->handlers->set_maintenance_mode(
1014                         intf->send_info, intf->maintenance_mode_enable);
1015 }
1016
1017 int ipmi_set_maintenance_mode(ipmi_user_t user, int mode)
1018 {
1019         int           rv = 0;
1020         unsigned long flags;
1021         ipmi_smi_t    intf = user->intf;
1022
1023         spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
1024         if (intf->maintenance_mode != mode) {
1025                 switch (mode) {
1026                 case IPMI_MAINTENANCE_MODE_AUTO:
1027                         intf->maintenance_mode = mode;
1028                         intf->maintenance_mode_enable
1029                                 = (intf->auto_maintenance_timeout > 0);
1030                         break;
1031
1032                 case IPMI_MAINTENANCE_MODE_OFF:
1033                         intf->maintenance_mode = mode;
1034                         intf->maintenance_mode_enable = 0;
1035                         break;
1036
1037                 case IPMI_MAINTENANCE_MODE_ON:
1038                         intf->maintenance_mode = mode;
1039                         intf->maintenance_mode_enable = 1;
1040                         break;
1041
1042                 default:
1043                         rv = -EINVAL;
1044                         goto out_unlock;
1045                 }
1046
1047                 maintenance_mode_update(intf);
1048         }
1049  out_unlock:
1050         spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags);
1051
1052         return rv;
1053 }
1054 EXPORT_SYMBOL(ipmi_set_maintenance_mode);
1055
1056 int ipmi_set_gets_events(ipmi_user_t user, int val)
1057 {
1058         unsigned long        flags;
1059         ipmi_smi_t           intf = user->intf;
1060         struct ipmi_recv_msg *msg, *msg2;
1061         struct list_head     msgs;
1062
1063         INIT_LIST_HEAD(&msgs);
1064
1065         spin_lock_irqsave(&intf->events_lock, flags);
1066         user->gets_events = val;
1067
1068         if (intf->delivering_events)
1069                 /*
1070                  * Another thread is delivering events for this, so
1071                  * let it handle any new events.
1072                  */
1073                 goto out;
1074
1075         /* Deliver any queued events. */
1076         while (user->gets_events && !list_empty(&intf->waiting_events)) {
1077                 list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link)
1078                         list_move_tail(&msg->link, &msgs);
1079                 intf->waiting_events_count = 0;
1080
1081                 intf->delivering_events = 1;
1082                 spin_unlock_irqrestore(&intf->events_lock, flags);
1083
1084                 list_for_each_entry_safe(msg, msg2, &msgs, link) {
1085                         msg->user = user;
1086                         kref_get(&user->refcount);
1087                         deliver_response(msg);
1088                 }
1089
1090                 spin_lock_irqsave(&intf->events_lock, flags);
1091                 intf->delivering_events = 0;
1092         }
1093
1094  out:
1095         spin_unlock_irqrestore(&intf->events_lock, flags);
1096
1097         return 0;
1098 }
1099
1100 static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t    intf,
1101                                       unsigned char netfn,
1102                                       unsigned char cmd,
1103                                       unsigned char chan)
1104 {
1105         struct cmd_rcvr *rcvr;
1106
1107         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1108                 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
1109                                         && (rcvr->chans & (1 << chan)))
1110                         return rcvr;
1111         }
1112         return NULL;
1113 }
1114
1115 static int is_cmd_rcvr_exclusive(ipmi_smi_t    intf,
1116                                  unsigned char netfn,
1117                                  unsigned char cmd,
1118                                  unsigned int  chans)
1119 {
1120         struct cmd_rcvr *rcvr;
1121
1122         list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1123                 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
1124                                         && (rcvr->chans & chans))
1125                         return 0;
1126         }
1127         return 1;
1128 }
1129
1130 int ipmi_register_for_cmd(ipmi_user_t   user,
1131                           unsigned char netfn,
1132                           unsigned char cmd,
1133                           unsigned int  chans)
1134 {
1135         ipmi_smi_t      intf = user->intf;
1136         struct cmd_rcvr *rcvr;
1137         int             rv = 0;
1138
1139
1140         rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
1141         if (!rcvr)
1142                 return -ENOMEM;
1143         rcvr->cmd = cmd;
1144         rcvr->netfn = netfn;
1145         rcvr->chans = chans;
1146         rcvr->user = user;
1147
1148         mutex_lock(&intf->cmd_rcvrs_mutex);
1149         /* Make sure the command/netfn is not already registered. */
1150         if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) {
1151                 rv = -EBUSY;
1152                 goto out_unlock;
1153         }
1154
1155         list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
1156
1157  out_unlock:
1158         mutex_unlock(&intf->cmd_rcvrs_mutex);
1159         if (rv)
1160                 kfree(rcvr);
1161
1162         return rv;
1163 }
1164
1165 int ipmi_unregister_for_cmd(ipmi_user_t   user,
1166                             unsigned char netfn,
1167                             unsigned char cmd,
1168                             unsigned int  chans)
1169 {
1170         ipmi_smi_t      intf = user->intf;
1171         struct cmd_rcvr *rcvr;
1172         struct cmd_rcvr *rcvrs = NULL;
1173         int i, rv = -ENOENT;
1174
1175         mutex_lock(&intf->cmd_rcvrs_mutex);
1176         for (i = 0; i < IPMI_NUM_CHANNELS; i++) {
1177                 if (((1 << i) & chans) == 0)
1178                         continue;
1179                 rcvr = find_cmd_rcvr(intf, netfn, cmd, i);
1180                 if (rcvr == NULL)
1181                         continue;
1182                 if (rcvr->user == user) {
1183                         rv = 0;
1184                         rcvr->chans &= ~chans;
1185                         if (rcvr->chans == 0) {
1186                                 list_del_rcu(&rcvr->link);
1187                                 rcvr->next = rcvrs;
1188                                 rcvrs = rcvr;
1189                         }
1190                 }
1191         }
1192         mutex_unlock(&intf->cmd_rcvrs_mutex);
1193         synchronize_rcu();
1194         while (rcvrs) {
1195                 rcvr = rcvrs;
1196                 rcvrs = rcvr->next;
1197                 kfree(rcvr);
1198         }
1199         return rv;
1200 }
1201
1202 void ipmi_user_set_run_to_completion(ipmi_user_t user, int val)
1203 {
1204         ipmi_smi_t intf = user->intf;
1205         if (intf->handlers)
1206                 intf->handlers->set_run_to_completion(intf->send_info, val);
1207 }
1208
1209 static unsigned char
1210 ipmb_checksum(unsigned char *data, int size)
1211 {
1212         unsigned char csum = 0;
1213
1214         for (; size > 0; size--, data++)
1215                 csum += *data;
1216
1217         return -csum;
1218 }
1219
1220 static inline void format_ipmb_msg(struct ipmi_smi_msg   *smi_msg,
1221                                    struct kernel_ipmi_msg *msg,
1222                                    struct ipmi_ipmb_addr *ipmb_addr,
1223                                    long                  msgid,
1224                                    unsigned char         ipmb_seq,
1225                                    int                   broadcast,
1226                                    unsigned char         source_address,
1227                                    unsigned char         source_lun)
1228 {
1229         int i = broadcast;
1230
1231         /* Format the IPMB header data. */
1232         smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
1233         smi_msg->data[1] = IPMI_SEND_MSG_CMD;
1234         smi_msg->data[2] = ipmb_addr->channel;
1235         if (broadcast)
1236                 smi_msg->data[3] = 0;
1237         smi_msg->data[i+3] = ipmb_addr->slave_addr;
1238         smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3);
1239         smi_msg->data[i+5] = ipmb_checksum(&(smi_msg->data[i+3]), 2);
1240         smi_msg->data[i+6] = source_address;
1241         smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun;
1242         smi_msg->data[i+8] = msg->cmd;
1243
1244         /* Now tack on the data to the message. */
1245         if (msg->data_len > 0)
1246                 memcpy(&(smi_msg->data[i+9]), msg->data,
1247                        msg->data_len);
1248         smi_msg->data_size = msg->data_len + 9;
1249
1250         /* Now calculate the checksum and tack it on. */
1251         smi_msg->data[i+smi_msg->data_size]
1252                 = ipmb_checksum(&(smi_msg->data[i+6]),
1253                                 smi_msg->data_size-6);
1254
1255         /* Add on the checksum size and the offset from the
1256            broadcast. */
1257         smi_msg->data_size += 1 + i;
1258
1259         smi_msg->msgid = msgid;
1260 }
1261
1262 static inline void format_lan_msg(struct ipmi_smi_msg   *smi_msg,
1263                                   struct kernel_ipmi_msg *msg,
1264                                   struct ipmi_lan_addr  *lan_addr,
1265                                   long                  msgid,
1266                                   unsigned char         ipmb_seq,
1267                                   unsigned char         source_lun)
1268 {
1269         /* Format the IPMB header data. */
1270         smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
1271         smi_msg->data[1] = IPMI_SEND_MSG_CMD;
1272         smi_msg->data[2] = lan_addr->channel;
1273         smi_msg->data[3] = lan_addr->session_handle;
1274         smi_msg->data[4] = lan_addr->remote_SWID;
1275         smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3);
1276         smi_msg->data[6] = ipmb_checksum(&(smi_msg->data[4]), 2);
1277         smi_msg->data[7] = lan_addr->local_SWID;
1278         smi_msg->data[8] = (ipmb_seq << 2) | source_lun;
1279         smi_msg->data[9] = msg->cmd;
1280
1281         /* Now tack on the data to the message. */
1282         if (msg->data_len > 0)
1283                 memcpy(&(smi_msg->data[10]), msg->data,
1284                        msg->data_len);
1285         smi_msg->data_size = msg->data_len + 10;
1286
1287         /* Now calculate the checksum and tack it on. */
1288         smi_msg->data[smi_msg->data_size]
1289                 = ipmb_checksum(&(smi_msg->data[7]),
1290                                 smi_msg->data_size-7);
1291
1292         /* Add on the checksum size and the offset from the
1293            broadcast. */
1294         smi_msg->data_size += 1;
1295
1296         smi_msg->msgid = msgid;
1297 }
1298
1299 /* Separate from ipmi_request so that the user does not have to be
1300    supplied in certain circumstances (mainly at panic time).  If
1301    messages are supplied, they will be freed, even if an error
1302    occurs. */
1303 static int i_ipmi_request(ipmi_user_t          user,
1304                           ipmi_smi_t           intf,
1305                           struct ipmi_addr     *addr,
1306                           long                 msgid,
1307                           struct kernel_ipmi_msg *msg,
1308                           void                 *user_msg_data,
1309                           void                 *supplied_smi,
1310                           struct ipmi_recv_msg *supplied_recv,
1311                           int                  priority,
1312                           unsigned char        source_address,
1313                           unsigned char        source_lun,
1314                           int                  retries,
1315                           unsigned int         retry_time_ms)
1316 {
1317         int                      rv = 0;
1318         struct ipmi_smi_msg      *smi_msg;
1319         struct ipmi_recv_msg     *recv_msg;
1320         unsigned long            flags;
1321         struct ipmi_smi_handlers *handlers;
1322
1323
1324         if (supplied_recv) {
1325                 recv_msg = supplied_recv;
1326         } else {
1327                 recv_msg = ipmi_alloc_recv_msg();
1328                 if (recv_msg == NULL) {
1329                         return -ENOMEM;
1330                 }
1331         }
1332         recv_msg->user_msg_data = user_msg_data;
1333
1334         if (supplied_smi) {
1335                 smi_msg = (struct ipmi_smi_msg *) supplied_smi;
1336         } else {
1337                 smi_msg = ipmi_alloc_smi_msg();
1338                 if (smi_msg == NULL) {
1339                         ipmi_free_recv_msg(recv_msg);
1340                         return -ENOMEM;
1341                 }
1342         }
1343
1344         rcu_read_lock();
1345         handlers = intf->handlers;
1346         if (!handlers) {
1347                 rv = -ENODEV;
1348                 goto out_err;
1349         }
1350
1351         recv_msg->user = user;
1352         if (user)
1353                 kref_get(&user->refcount);
1354         recv_msg->msgid = msgid;
1355         /* Store the message to send in the receive message so timeout
1356            responses can get the proper response data. */
1357         recv_msg->msg = *msg;
1358
1359         if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
1360                 struct ipmi_system_interface_addr *smi_addr;
1361
1362                 if (msg->netfn & 1) {
1363                         /* Responses are not allowed to the SMI. */
1364                         rv = -EINVAL;
1365                         goto out_err;
1366                 }
1367
1368                 smi_addr = (struct ipmi_system_interface_addr *) addr;
1369                 if (smi_addr->lun > 3) {
1370                         spin_lock_irqsave(&intf->counter_lock, flags);
1371                         intf->sent_invalid_commands++;
1372                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1373                         rv = -EINVAL;
1374                         goto out_err;
1375                 }
1376
1377                 memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr));
1378
1379                 if ((msg->netfn == IPMI_NETFN_APP_REQUEST)
1380                     && ((msg->cmd == IPMI_SEND_MSG_CMD)
1381                         || (msg->cmd == IPMI_GET_MSG_CMD)
1382                         || (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD)))
1383                 {
1384                         /* We don't let the user do these, since we manage
1385                            the sequence numbers. */
1386                         spin_lock_irqsave(&intf->counter_lock, flags);
1387                         intf->sent_invalid_commands++;
1388                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1389                         rv = -EINVAL;
1390                         goto out_err;
1391                 }
1392
1393                 if (((msg->netfn == IPMI_NETFN_APP_REQUEST)
1394                       && ((msg->cmd == IPMI_COLD_RESET_CMD)
1395                           || (msg->cmd == IPMI_WARM_RESET_CMD)))
1396                      || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST))
1397                 {
1398                         spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
1399                         intf->auto_maintenance_timeout
1400                                 = IPMI_MAINTENANCE_MODE_TIMEOUT;
1401                         if (!intf->maintenance_mode
1402                             && !intf->maintenance_mode_enable)
1403                         {
1404                                 intf->maintenance_mode_enable = 1;
1405                                 maintenance_mode_update(intf);
1406                         }
1407                         spin_unlock_irqrestore(&intf->maintenance_mode_lock,
1408                                                flags);
1409                 }
1410
1411                 if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) {
1412                         spin_lock_irqsave(&intf->counter_lock, flags);
1413                         intf->sent_invalid_commands++;
1414                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1415                         rv = -EMSGSIZE;
1416                         goto out_err;
1417                 }
1418
1419                 smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3);
1420                 smi_msg->data[1] = msg->cmd;
1421                 smi_msg->msgid = msgid;
1422                 smi_msg->user_data = recv_msg;
1423                 if (msg->data_len > 0)
1424                         memcpy(&(smi_msg->data[2]), msg->data, msg->data_len);
1425                 smi_msg->data_size = msg->data_len + 2;
1426                 spin_lock_irqsave(&intf->counter_lock, flags);
1427                 intf->sent_local_commands++;
1428                 spin_unlock_irqrestore(&intf->counter_lock, flags);
1429         } else if ((addr->addr_type == IPMI_IPMB_ADDR_TYPE)
1430                    || (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
1431         {
1432                 struct ipmi_ipmb_addr *ipmb_addr;
1433                 unsigned char         ipmb_seq;
1434                 long                  seqid;
1435                 int                   broadcast = 0;
1436
1437                 if (addr->channel >= IPMI_MAX_CHANNELS) {
1438                         spin_lock_irqsave(&intf->counter_lock, flags);
1439                         intf->sent_invalid_commands++;
1440                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1441                         rv = -EINVAL;
1442                         goto out_err;
1443                 }
1444
1445                 if (intf->channels[addr->channel].medium
1446                     != IPMI_CHANNEL_MEDIUM_IPMB)
1447                 {
1448                         spin_lock_irqsave(&intf->counter_lock, flags);
1449                         intf->sent_invalid_commands++;
1450                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1451                         rv = -EINVAL;
1452                         goto out_err;
1453                 }
1454
1455                 if (retries < 0) {
1456                     if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)
1457                         retries = 0; /* Don't retry broadcasts. */
1458                     else
1459                         retries = 4;
1460                 }
1461                 if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) {
1462                     /* Broadcasts add a zero at the beginning of the
1463                        message, but otherwise is the same as an IPMB
1464                        address. */
1465                     addr->addr_type = IPMI_IPMB_ADDR_TYPE;
1466                     broadcast = 1;
1467                 }
1468
1469
1470                 /* Default to 1 second retries. */
1471                 if (retry_time_ms == 0)
1472                     retry_time_ms = 1000;
1473
1474                 /* 9 for the header and 1 for the checksum, plus
1475                    possibly one for the broadcast. */
1476                 if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) {
1477                         spin_lock_irqsave(&intf->counter_lock, flags);
1478                         intf->sent_invalid_commands++;
1479                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1480                         rv = -EMSGSIZE;
1481                         goto out_err;
1482                 }
1483
1484                 ipmb_addr = (struct ipmi_ipmb_addr *) addr;
1485                 if (ipmb_addr->lun > 3) {
1486                         spin_lock_irqsave(&intf->counter_lock, flags);
1487                         intf->sent_invalid_commands++;
1488                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1489                         rv = -EINVAL;
1490                         goto out_err;
1491                 }
1492
1493                 memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr));
1494
1495                 if (recv_msg->msg.netfn & 0x1) {
1496                         /* It's a response, so use the user's sequence
1497                            from msgid. */
1498                         spin_lock_irqsave(&intf->counter_lock, flags);
1499                         intf->sent_ipmb_responses++;
1500                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1501                         format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid,
1502                                         msgid, broadcast,
1503                                         source_address, source_lun);
1504
1505                         /* Save the receive message so we can use it
1506                            to deliver the response. */
1507                         smi_msg->user_data = recv_msg;
1508                 } else {
1509                         /* It's a command, so get a sequence for it. */
1510
1511                         spin_lock_irqsave(&(intf->seq_lock), flags);
1512
1513                         spin_lock(&intf->counter_lock);
1514                         intf->sent_ipmb_commands++;
1515                         spin_unlock(&intf->counter_lock);
1516
1517                         /* Create a sequence number with a 1 second
1518                            timeout and 4 retries. */
1519                         rv = intf_next_seq(intf,
1520                                            recv_msg,
1521                                            retry_time_ms,
1522                                            retries,
1523                                            broadcast,
1524                                            &ipmb_seq,
1525                                            &seqid);
1526                         if (rv) {
1527                                 /* We have used up all the sequence numbers,
1528                                    probably, so abort. */
1529                                 spin_unlock_irqrestore(&(intf->seq_lock),
1530                                                        flags);
1531                                 goto out_err;
1532                         }
1533
1534                         /* Store the sequence number in the message,
1535                            so that when the send message response
1536                            comes back we can start the timer. */
1537                         format_ipmb_msg(smi_msg, msg, ipmb_addr,
1538                                         STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
1539                                         ipmb_seq, broadcast,
1540                                         source_address, source_lun);
1541
1542                         /* Copy the message into the recv message data, so we
1543                            can retransmit it later if necessary. */
1544                         memcpy(recv_msg->msg_data, smi_msg->data,
1545                                smi_msg->data_size);
1546                         recv_msg->msg.data = recv_msg->msg_data;
1547                         recv_msg->msg.data_len = smi_msg->data_size;
1548
1549                         /* We don't unlock until here, because we need
1550                            to copy the completed message into the
1551                            recv_msg before we release the lock.
1552                            Otherwise, race conditions may bite us.  I
1553                            know that's pretty paranoid, but I prefer
1554                            to be correct. */
1555                         spin_unlock_irqrestore(&(intf->seq_lock), flags);
1556                 }
1557         } else if (addr->addr_type == IPMI_LAN_ADDR_TYPE) {
1558                 struct ipmi_lan_addr  *lan_addr;
1559                 unsigned char         ipmb_seq;
1560                 long                  seqid;
1561
1562                 if (addr->channel >= IPMI_MAX_CHANNELS) {
1563                         spin_lock_irqsave(&intf->counter_lock, flags);
1564                         intf->sent_invalid_commands++;
1565                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1566                         rv = -EINVAL;
1567                         goto out_err;
1568                 }
1569
1570                 if ((intf->channels[addr->channel].medium
1571                     != IPMI_CHANNEL_MEDIUM_8023LAN)
1572                     && (intf->channels[addr->channel].medium
1573                         != IPMI_CHANNEL_MEDIUM_ASYNC))
1574                 {
1575                         spin_lock_irqsave(&intf->counter_lock, flags);
1576                         intf->sent_invalid_commands++;
1577                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1578                         rv = -EINVAL;
1579                         goto out_err;
1580                 }
1581
1582                 retries = 4;
1583
1584                 /* Default to 1 second retries. */
1585                 if (retry_time_ms == 0)
1586                     retry_time_ms = 1000;
1587
1588                 /* 11 for the header and 1 for the checksum. */
1589                 if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) {
1590                         spin_lock_irqsave(&intf->counter_lock, flags);
1591                         intf->sent_invalid_commands++;
1592                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1593                         rv = -EMSGSIZE;
1594                         goto out_err;
1595                 }
1596
1597                 lan_addr = (struct ipmi_lan_addr *) addr;
1598                 if (lan_addr->lun > 3) {
1599                         spin_lock_irqsave(&intf->counter_lock, flags);
1600                         intf->sent_invalid_commands++;
1601                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1602                         rv = -EINVAL;
1603                         goto out_err;
1604                 }
1605
1606                 memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr));
1607
1608                 if (recv_msg->msg.netfn & 0x1) {
1609                         /* It's a response, so use the user's sequence
1610                            from msgid. */
1611                         spin_lock_irqsave(&intf->counter_lock, flags);
1612                         intf->sent_lan_responses++;
1613                         spin_unlock_irqrestore(&intf->counter_lock, flags);
1614                         format_lan_msg(smi_msg, msg, lan_addr, msgid,
1615                                        msgid, source_lun);
1616
1617                         /* Save the receive message so we can use it
1618                            to deliver the response. */
1619                         smi_msg->user_data = recv_msg;
1620                 } else {
1621                         /* It's a command, so get a sequence for it. */
1622
1623                         spin_lock_irqsave(&(intf->seq_lock), flags);
1624
1625                         spin_lock(&intf->counter_lock);
1626                         intf->sent_lan_commands++;
1627                         spin_unlock(&intf->counter_lock);
1628
1629                         /* Create a sequence number with a 1 second
1630                            timeout and 4 retries. */
1631                         rv = intf_next_seq(intf,
1632                                            recv_msg,
1633                                            retry_time_ms,
1634                                            retries,
1635                                            0,
1636                                            &ipmb_seq,
1637                                            &seqid);
1638                         if (rv) {
1639                                 /* We have used up all the sequence numbers,
1640                                    probably, so abort. */
1641                                 spin_unlock_irqrestore(&(intf->seq_lock),
1642                                                        flags);
1643                                 goto out_err;
1644                         }
1645
1646                         /* Store the sequence number in the message,
1647                            so that when the send message response
1648                            comes back we can start the timer. */
1649                         format_lan_msg(smi_msg, msg, lan_addr,
1650                                        STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
1651                                        ipmb_seq, source_lun);
1652
1653                         /* Copy the message into the recv message data, so we
1654                            can retransmit it later if necessary. */
1655                         memcpy(recv_msg->msg_data, smi_msg->data,
1656                                smi_msg->data_size);
1657                         recv_msg->msg.data = recv_msg->msg_data;
1658                         recv_msg->msg.data_len = smi_msg->data_size;
1659
1660                         /* We don't unlock until here, because we need
1661                            to copy the completed message into the
1662                            recv_msg before we release the lock.
1663                            Otherwise, race conditions may bite us.  I
1664                            know that's pretty paranoid, but I prefer
1665                            to be correct. */
1666                         spin_unlock_irqrestore(&(intf->seq_lock), flags);
1667                 }
1668         } else {
1669             /* Unknown address type. */
1670                 spin_lock_irqsave(&intf->counter_lock, flags);
1671                 intf->sent_invalid_commands++;
1672                 spin_unlock_irqrestore(&intf->counter_lock, flags);
1673                 rv = -EINVAL;
1674                 goto out_err;
1675         }
1676
1677 #ifdef DEBUG_MSGING
1678         {
1679                 int m;
1680                 for (m = 0; m < smi_msg->data_size; m++)
1681                         printk(" %2.2x", smi_msg->data[m]);
1682                 printk("\n");
1683         }
1684 #endif
1685
1686         handlers->sender(intf->send_info, smi_msg, priority);
1687         rcu_read_unlock();
1688
1689         return 0;
1690
1691  out_err:
1692         rcu_read_unlock();
1693         ipmi_free_smi_msg(smi_msg);
1694         ipmi_free_recv_msg(recv_msg);
1695         return rv;
1696 }
1697
1698 static int check_addr(ipmi_smi_t       intf,
1699                       struct ipmi_addr *addr,
1700                       unsigned char    *saddr,
1701                       unsigned char    *lun)
1702 {
1703         if (addr->channel >= IPMI_MAX_CHANNELS)
1704                 return -EINVAL;
1705         *lun = intf->channels[addr->channel].lun;
1706         *saddr = intf->channels[addr->channel].address;
1707         return 0;
1708 }
1709
1710 int ipmi_request_settime(ipmi_user_t      user,
1711                          struct ipmi_addr *addr,
1712                          long             msgid,
1713                          struct kernel_ipmi_msg  *msg,
1714                          void             *user_msg_data,
1715                          int              priority,
1716                          int              retries,
1717                          unsigned int     retry_time_ms)
1718 {
1719         unsigned char saddr, lun;
1720         int           rv;
1721
1722         if (!user)
1723                 return -EINVAL;
1724         rv = check_addr(user->intf, addr, &saddr, &lun);
1725         if (rv)
1726                 return rv;
1727         return i_ipmi_request(user,
1728                               user->intf,
1729                               addr,
1730                               msgid,
1731                               msg,
1732                               user_msg_data,
1733                               NULL, NULL,
1734                               priority,
1735                               saddr,
1736                               lun,
1737                               retries,
1738                               retry_time_ms);
1739 }
1740
1741 int ipmi_request_supply_msgs(ipmi_user_t          user,
1742                              struct ipmi_addr     *addr,
1743                              long                 msgid,
1744                              struct kernel_ipmi_msg *msg,
1745                              void                 *user_msg_data,
1746                              void                 *supplied_smi,
1747                              struct ipmi_recv_msg *supplied_recv,
1748                              int                  priority)
1749 {
1750         unsigned char saddr, lun;
1751         int           rv;
1752
1753         if (!user)
1754                 return -EINVAL;
1755         rv = check_addr(user->intf, addr, &saddr, &lun);
1756         if (rv)
1757                 return rv;
1758         return i_ipmi_request(user,
1759                               user->intf,
1760                               addr,
1761                               msgid,
1762                               msg,
1763                               user_msg_data,
1764                               supplied_smi,
1765                               supplied_recv,
1766                               priority,
1767                               saddr,
1768                               lun,
1769                               -1, 0);
1770 }
1771
1772 #ifdef CONFIG_PROC_FS
1773 static int ipmb_file_read_proc(char *page, char **start, off_t off,
1774                                int count, int *eof, void *data)
1775 {
1776         char       *out = (char *) page;
1777         ipmi_smi_t intf = data;
1778         int        i;
1779         int        rv = 0;
1780
1781         for (i = 0; i < IPMI_MAX_CHANNELS; i++)
1782                 rv += sprintf(out+rv, "%x ", intf->channels[i].address);
1783         out[rv-1] = '\n'; /* Replace the final space with a newline */
1784         out[rv] = '\0';
1785         rv++;
1786         return rv;
1787 }
1788
1789 static int version_file_read_proc(char *page, char **start, off_t off,
1790                                   int count, int *eof, void *data)
1791 {
1792         char       *out = (char *) page;
1793         ipmi_smi_t intf = data;
1794
1795         return sprintf(out, "%d.%d\n",
1796                        ipmi_version_major(&intf->bmc->id),
1797                        ipmi_version_minor(&intf->bmc->id));
1798 }
1799
1800 static int stat_file_read_proc(char *page, char **start, off_t off,
1801                                int count, int *eof, void *data)
1802 {
1803         char       *out = (char *) page;
1804         ipmi_smi_t intf = data;
1805
1806         out += sprintf(out, "sent_invalid_commands:       %d\n",
1807                        intf->sent_invalid_commands);
1808         out += sprintf(out, "sent_local_commands:         %d\n",
1809                        intf->sent_local_commands);
1810         out += sprintf(out, "handled_local_responses:     %d\n",
1811                        intf->handled_local_responses);
1812         out += sprintf(out, "unhandled_local_responses:   %d\n",
1813                        intf->unhandled_local_responses);
1814         out += sprintf(out, "sent_ipmb_commands:          %d\n",
1815                        intf->sent_ipmb_commands);
1816         out += sprintf(out, "sent_ipmb_command_errs:      %d\n",
1817                        intf->sent_ipmb_command_errs);
1818         out += sprintf(out, "retransmitted_ipmb_commands: %d\n",
1819                        intf->retransmitted_ipmb_commands);
1820         out += sprintf(out, "timed_out_ipmb_commands:     %d\n",
1821                        intf->timed_out_ipmb_commands);
1822         out += sprintf(out, "timed_out_ipmb_broadcasts:   %d\n",
1823                        intf->timed_out_ipmb_broadcasts);
1824         out += sprintf(out, "sent_ipmb_responses:         %d\n",
1825                        intf->sent_ipmb_responses);
1826         out += sprintf(out, "handled_ipmb_responses:      %d\n",
1827                        intf->handled_ipmb_responses);
1828         out += sprintf(out, "invalid_ipmb_responses:      %d\n",
1829                        intf->invalid_ipmb_responses);
1830         out += sprintf(out, "unhandled_ipmb_responses:    %d\n",
1831                        intf->unhandled_ipmb_responses);
1832         out += sprintf(out, "sent_lan_commands:           %d\n",
1833                        intf->sent_lan_commands);
1834         out += sprintf(out, "sent_lan_command_errs:       %d\n",
1835                        intf->sent_lan_command_errs);
1836         out += sprintf(out, "retransmitted_lan_commands:  %d\n",
1837                        intf->retransmitted_lan_commands);
1838         out += sprintf(out, "timed_out_lan_commands:      %d\n",
1839                        intf->timed_out_lan_commands);
1840         out += sprintf(out, "sent_lan_responses:          %d\n",
1841                        intf->sent_lan_responses);
1842         out += sprintf(out, "handled_lan_responses:       %d\n",
1843                        intf->handled_lan_responses);
1844         out += sprintf(out, "invalid_lan_responses:       %d\n",
1845                        intf->invalid_lan_responses);
1846         out += sprintf(out, "unhandled_lan_responses:     %d\n",
1847                        intf->unhandled_lan_responses);
1848         out += sprintf(out, "handled_commands:            %d\n",
1849                        intf->handled_commands);
1850         out += sprintf(out, "invalid_commands:            %d\n",
1851                        intf->invalid_commands);
1852         out += sprintf(out, "unhandled_commands:          %d\n",
1853                        intf->unhandled_commands);
1854         out += sprintf(out, "invalid_events:              %d\n",
1855                        intf->invalid_events);
1856         out += sprintf(out, "events:                      %d\n",
1857                        intf->events);
1858
1859         return (out - ((char *) page));
1860 }
1861 #endif /* CONFIG_PROC_FS */
1862
1863 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
1864                             read_proc_t *read_proc, write_proc_t *write_proc,
1865                             void *data, struct module *owner)
1866 {
1867         int                    rv = 0;
1868 #ifdef CONFIG_PROC_FS
1869         struct proc_dir_entry  *file;
1870         struct ipmi_proc_entry *entry;
1871
1872         /* Create a list element. */
1873         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
1874         if (!entry)
1875                 return -ENOMEM;
1876         entry->name = kmalloc(strlen(name)+1, GFP_KERNEL);
1877         if (!entry->name) {
1878                 kfree(entry);
1879                 return -ENOMEM;
1880         }
1881         strcpy(entry->name, name);
1882
1883         file = create_proc_entry(name, 0, smi->proc_dir);
1884         if (!file) {
1885                 kfree(entry->name);
1886                 kfree(entry);
1887                 rv = -ENOMEM;
1888         } else {
1889                 file->nlink = 1;
1890                 file->data = data;
1891                 file->read_proc = read_proc;
1892                 file->write_proc = write_proc;
1893                 file->owner = owner;
1894
1895                 spin_lock(&smi->proc_entry_lock);
1896                 /* Stick it on the list. */
1897                 entry->next = smi->proc_entries;
1898                 smi->proc_entries = entry;
1899                 spin_unlock(&smi->proc_entry_lock);
1900         }
1901 #endif /* CONFIG_PROC_FS */
1902
1903         return rv;
1904 }
1905
1906 static int add_proc_entries(ipmi_smi_t smi, int num)
1907 {
1908         int rv = 0;
1909
1910 #ifdef CONFIG_PROC_FS
1911         sprintf(smi->proc_dir_name, "%d", num);
1912         smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
1913         if (!smi->proc_dir)
1914                 rv = -ENOMEM;
1915         else {
1916                 smi->proc_dir->owner = THIS_MODULE;
1917         }
1918
1919         if (rv == 0)
1920                 rv = ipmi_smi_add_proc_entry(smi, "stats",
1921                                              stat_file_read_proc, NULL,
1922                                              smi, THIS_MODULE);
1923
1924         if (rv == 0)
1925                 rv = ipmi_smi_add_proc_entry(smi, "ipmb",
1926                                              ipmb_file_read_proc, NULL,
1927                                              smi, THIS_MODULE);
1928
1929         if (rv == 0)
1930                 rv = ipmi_smi_add_proc_entry(smi, "version",
1931                                              version_file_read_proc, NULL,
1932                                              smi, THIS_MODULE);
1933 #endif /* CONFIG_PROC_FS */
1934
1935         return rv;
1936 }
1937
1938 static void remove_proc_entries(ipmi_smi_t smi)
1939 {
1940 #ifdef CONFIG_PROC_FS
1941         struct ipmi_proc_entry *entry;
1942
1943         spin_lock(&smi->proc_entry_lock);
1944         while (smi->proc_entries) {
1945                 entry = smi->proc_entries;
1946                 smi->proc_entries = entry->next;
1947
1948                 remove_proc_entry(entry->name, smi->proc_dir);
1949                 kfree(entry->name);
1950                 kfree(entry);
1951         }
1952         spin_unlock(&smi->proc_entry_lock);
1953         remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
1954 #endif /* CONFIG_PROC_FS */
1955 }
1956
1957 static int __find_bmc_guid(struct device *dev, void *data)
1958 {
1959         unsigned char *id = data;
1960         struct bmc_device *bmc = dev_get_drvdata(dev);
1961         return memcmp(bmc->guid, id, 16) == 0;
1962 }
1963
1964 static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
1965                                              unsigned char *guid)
1966 {
1967         struct device *dev;
1968
1969         dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
1970         if (dev)
1971                 return dev_get_drvdata(dev);
1972         else
1973                 return NULL;
1974 }
1975
1976 struct prod_dev_id {
1977         unsigned int  product_id;
1978         unsigned char device_id;
1979 };
1980
1981 static int __find_bmc_prod_dev_id(struct device *dev, void *data)
1982 {
1983         struct prod_dev_id *id = data;
1984         struct bmc_device *bmc = dev_get_drvdata(dev);
1985
1986         return (bmc->id.product_id == id->product_id
1987                 && bmc->id.device_id == id->device_id);
1988 }
1989
1990 static struct bmc_device *ipmi_find_bmc_prod_dev_id(
1991         struct device_driver *drv,
1992         unsigned int product_id, unsigned char device_id)
1993 {
1994         struct prod_dev_id id = {
1995                 .product_id = product_id,
1996                 .device_id = device_id,
1997         };
1998         struct device *dev;
1999
2000         dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
2001         if (dev)
2002                 return dev_get_drvdata(dev);
2003         else
2004                 return NULL;
2005 }
2006
2007 static ssize_t device_id_show(struct device *dev,
2008                               struct device_attribute *attr,
2009                               char *buf)
2010 {
2011         struct bmc_device *bmc = dev_get_drvdata(dev);
2012
2013         return snprintf(buf, 10, "%u\n", bmc->id.device_id);
2014 }
2015
2016 static ssize_t provides_dev_sdrs_show(struct device *dev,
2017                                       struct device_attribute *attr,
2018                                       char *buf)
2019 {
2020         struct bmc_device *bmc = dev_get_drvdata(dev);
2021
2022         return snprintf(buf, 10, "%u\n",
2023                         (bmc->id.device_revision & 0x80) >> 7);
2024 }
2025
2026 static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
2027                              char *buf)
2028 {
2029         struct bmc_device *bmc = dev_get_drvdata(dev);
2030
2031         return snprintf(buf, 20, "%u\n",
2032                         bmc->id.device_revision & 0x0F);
2033 }
2034
2035 static ssize_t firmware_rev_show(struct device *dev,
2036                                  struct device_attribute *attr,
2037                                  char *buf)
2038 {
2039         struct bmc_device *bmc = dev_get_drvdata(dev);
2040
2041         return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1,
2042                         bmc->id.firmware_revision_2);
2043 }
2044
2045 static ssize_t ipmi_version_show(struct device *dev,
2046                                  struct device_attribute *attr,
2047                                  char *buf)
2048 {
2049         struct bmc_device *bmc = dev_get_drvdata(dev);
2050
2051         return snprintf(buf, 20, "%u.%u\n",
2052                         ipmi_version_major(&bmc->id),
2053                         ipmi_version_minor(&bmc->id));
2054 }
2055
2056 static ssize_t add_dev_support_show(struct device *dev,
2057                                     struct device_attribute *attr,
2058                                     char *buf)
2059 {
2060         struct bmc_device *bmc = dev_get_drvdata(dev);
2061
2062         return snprintf(buf, 10, "0x%02x\n",
2063                         bmc->id.additional_device_support);
2064 }
2065
2066 static ssize_t manufacturer_id_show(struct device *dev,
2067                                     struct device_attribute *attr,
2068                                     char *buf)
2069 {
2070         struct bmc_device *bmc = dev_get_drvdata(dev);
2071
2072         return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id);
2073 }
2074
2075 static ssize_t product_id_show(struct device *dev,
2076                                struct device_attribute *attr,
2077                                char *buf)
2078 {
2079         struct bmc_device *bmc = dev_get_drvdata(dev);
2080
2081         return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id);
2082 }
2083
2084 static ssize_t aux_firmware_rev_show(struct device *dev,
2085                                      struct device_attribute *attr,
2086                                      char *buf)
2087 {
2088         struct bmc_device *bmc = dev_get_drvdata(dev);
2089
2090         return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
2091                         bmc->id.aux_firmware_revision[3],
2092                         bmc->id.aux_firmware_revision[2],
2093                         bmc->id.aux_firmware_revision[1],
2094                         bmc->id.aux_firmware_revision[0]);
2095 }
2096
2097 static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
2098                          char *buf)
2099 {
2100         struct bmc_device *bmc = dev_get_drvdata(dev);
2101
2102         return snprintf(buf, 100, "%Lx%Lx\n",
2103                         (long long) bmc->guid[0],
2104                         (long long) bmc->guid[8]);
2105 }
2106
2107 static void remove_files(struct bmc_device *bmc)
2108 {
2109         if (!bmc->dev)
2110                 return;
2111
2112         device_remove_file(&bmc->dev->dev,
2113                            &bmc->device_id_attr);
2114         device_remove_file(&bmc->dev->dev,
2115                            &bmc->provides_dev_sdrs_attr);
2116         device_remove_file(&bmc->dev->dev,
2117                            &bmc->revision_attr);
2118         device_remove_file(&bmc->dev->dev,
2119                            &bmc->firmware_rev_attr);
2120         device_remove_file(&bmc->dev->dev,
2121                            &bmc->version_attr);
2122         device_remove_file(&bmc->dev->dev,
2123                            &bmc->add_dev_support_attr);
2124         device_remove_file(&bmc->dev->dev,
2125                            &bmc->manufacturer_id_attr);
2126         device_remove_file(&bmc->dev->dev,
2127                            &bmc->product_id_attr);
2128
2129         if (bmc->id.aux_firmware_revision_set)
2130                 device_remove_file(&bmc->dev->dev,
2131                                    &bmc->aux_firmware_rev_attr);
2132         if (bmc->guid_set)
2133                 device_remove_file(&bmc->dev->dev,
2134                                    &bmc->guid_attr);
2135 }
2136
2137 static void
2138 cleanup_bmc_device(struct kref *ref)
2139 {
2140         struct bmc_device *bmc;
2141
2142         bmc = container_of(ref, struct bmc_device, refcount);
2143
2144         remove_files(bmc);
2145         platform_device_unregister(bmc->dev);
2146         kfree(bmc);
2147 }
2148
2149 static void ipmi_bmc_unregister(ipmi_smi_t intf)
2150 {
2151         struct bmc_device *bmc = intf->bmc;
2152
2153         if (intf->sysfs_name) {
2154                 sysfs_remove_link(&intf->si_dev->kobj, intf->sysfs_name);
2155                 kfree(intf->sysfs_name);
2156                 intf->sysfs_name = NULL;
2157         }
2158         if (intf->my_dev_name) {
2159                 sysfs_remove_link(&bmc->dev->dev.kobj, intf->my_dev_name);
2160                 kfree(intf->my_dev_name);
2161                 intf->my_dev_name = NULL;
2162         }
2163
2164         mutex_lock(&ipmidriver_mutex);
2165         kref_put(&bmc->refcount, cleanup_bmc_device);
2166         intf->bmc = NULL;
2167         mutex_unlock(&ipmidriver_mutex);
2168 }
2169
2170 static int create_files(struct bmc_device *bmc)
2171 {
2172         int err;
2173
2174         bmc->device_id_attr.attr.name = "device_id";
2175         bmc->device_id_attr.attr.owner = THIS_MODULE;
2176         bmc->device_id_attr.attr.mode = S_IRUGO;
2177         bmc->device_id_attr.show = device_id_show;
2178
2179         bmc->provides_dev_sdrs_attr.attr.name = "provides_device_sdrs";
2180         bmc->provides_dev_sdrs_attr.attr.owner = THIS_MODULE;
2181         bmc->provides_dev_sdrs_attr.attr.mode = S_IRUGO;
2182         bmc->provides_dev_sdrs_attr.show = provides_dev_sdrs_show;
2183
2184         bmc->revision_attr.attr.name = "revision";
2185         bmc->revision_attr.attr.owner = THIS_MODULE;
2186         bmc->revision_attr.attr.mode = S_IRUGO;
2187         bmc->revision_attr.show = revision_show;
2188
2189         bmc->firmware_rev_attr.attr.name = "firmware_revision";
2190         bmc->firmware_rev_attr.attr.owner = THIS_MODULE;
2191         bmc->firmware_rev_attr.attr.mode = S_IRUGO;
2192         bmc->firmware_rev_attr.show = firmware_rev_show;
2193
2194         bmc->version_attr.attr.name = "ipmi_version";
2195         bmc->version_attr.attr.owner = THIS_MODULE;
2196         bmc->version_attr.attr.mode = S_IRUGO;
2197         bmc->version_attr.show = ipmi_version_show;
2198
2199         bmc->add_dev_support_attr.attr.name = "additional_device_support";
2200         bmc->add_dev_support_attr.attr.owner = THIS_MODULE;
2201         bmc->add_dev_support_attr.attr.mode = S_IRUGO;
2202         bmc->add_dev_support_attr.show = add_dev_support_show;
2203
2204         bmc->manufacturer_id_attr.attr.name = "manufacturer_id";
2205         bmc->manufacturer_id_attr.attr.owner = THIS_MODULE;
2206         bmc->manufacturer_id_attr.attr.mode = S_IRUGO;
2207         bmc->manufacturer_id_attr.show = manufacturer_id_show;
2208
2209         bmc->product_id_attr.attr.name = "product_id";
2210         bmc->product_id_attr.attr.owner = THIS_MODULE;
2211         bmc->product_id_attr.attr.mode = S_IRUGO;
2212         bmc->product_id_attr.show = product_id_show;
2213
2214         bmc->guid_attr.attr.name = "guid";
2215         bmc->guid_attr.attr.owner = THIS_MODULE;
2216         bmc->guid_attr.attr.mode = S_IRUGO;
2217         bmc->guid_attr.show = guid_show;
2218
2219         bmc->aux_firmware_rev_attr.attr.name = "aux_firmware_revision";
2220         bmc->aux_firmware_rev_attr.attr.owner = THIS_MODULE;
2221         bmc->aux_firmware_rev_attr.attr.mode = S_IRUGO;
2222         bmc->aux_firmware_rev_attr.show = aux_firmware_rev_show;
2223
2224         err = device_create_file(&bmc->dev->dev,
2225                            &bmc->device_id_attr);
2226         if (err) goto out;
2227         err = device_create_file(&bmc->dev->dev,
2228                            &bmc->provides_dev_sdrs_attr);
2229         if (err) goto out_devid;
2230         err = device_create_file(&bmc->dev->dev,
2231                            &bmc->revision_attr);
2232         if (err) goto out_sdrs;
2233         err = device_create_file(&bmc->dev->dev,
2234                            &bmc->firmware_rev_attr);
2235         if (err) goto out_rev;
2236         err = device_create_file(&bmc->dev->dev,
2237                            &bmc->version_attr);
2238         if (err) goto out_firm;
2239         err = device_create_file(&bmc->dev->dev,
2240                            &bmc->add_dev_support_attr);
2241         if (err) goto out_version;
2242         err = device_create_file(&bmc->dev->dev,
2243                            &bmc->manufacturer_id_attr);
2244         if (err) goto out_add_dev;
2245         err = device_create_file(&bmc->dev->dev,
2246                            &bmc->product_id_attr);
2247         if (err) goto out_manu;
2248         if (bmc->id.aux_firmware_revision_set) {
2249                 err = device_create_file(&bmc->dev->dev,
2250                                    &bmc->aux_firmware_rev_attr);
2251                 if (err) goto out_prod_id;
2252         }
2253         if (bmc->guid_set) {
2254                 err = device_create_file(&bmc->dev->dev,
2255                                    &bmc->guid_attr);
2256                 if (err) goto out_aux_firm;
2257         }
2258
2259         return 0;
2260
2261 out_aux_firm:
2262         if (bmc->id.aux_firmware_revision_set)
2263                 device_remove_file(&bmc->dev->dev,
2264                                    &bmc->aux_firmware_rev_attr);
2265 out_prod_id:
2266         device_remove_file(&bmc->dev->dev,
2267                            &bmc->product_id_attr);
2268 out_manu:
2269         device_remove_file(&bmc->dev->dev,
2270                            &bmc->manufacturer_id_attr);
2271 out_add_dev:
2272         device_remove_file(&bmc->dev->dev,
2273                            &bmc->add_dev_support_attr);
2274 out_version:
2275         device_remove_file(&bmc->dev->dev,
2276                            &bmc->version_attr);
2277 out_firm:
2278         device_remove_file(&bmc->dev->dev,
2279                            &bmc->firmware_rev_attr);
2280 out_rev:
2281         device_remove_file(&bmc->dev->dev,
2282                            &bmc->revision_attr);
2283 out_sdrs:
2284         device_remove_file(&bmc->dev->dev,
2285                            &bmc->provides_dev_sdrs_attr);
2286 out_devid:
2287         device_remove_file(&bmc->dev->dev,
2288                            &bmc->device_id_attr);
2289 out:
2290         return err;
2291 }
2292
2293 static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum,
2294                              const char *sysfs_name)
2295 {
2296         int               rv;
2297         struct bmc_device *bmc = intf->bmc;
2298         struct bmc_device *old_bmc;
2299         int               size;
2300         char              dummy[1];
2301
2302         mutex_lock(&ipmidriver_mutex);
2303
2304         /*
2305          * Try to find if there is an bmc_device struct
2306          * representing the interfaced BMC already
2307          */
2308         if (bmc->guid_set)
2309                 old_bmc = ipmi_find_bmc_guid(&ipmidriver, bmc->guid);
2310         else
2311                 old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver,
2312                                                     bmc->id.product_id,
2313                                                     bmc->id.device_id);
2314
2315         /*
2316          * If there is already an bmc_device, free the new one,
2317          * otherwise register the new BMC device
2318          */
2319         if (old_bmc) {
2320                 kfree(bmc);
2321                 intf->bmc = old_bmc;
2322                 bmc = old_bmc;
2323
2324                 kref_get(&bmc->refcount);
2325                 mutex_unlock(&ipmidriver_mutex);
2326
2327                 printk(KERN_INFO
2328                        "ipmi: interfacing existing BMC (man_id: 0x%6.6x,"
2329                        " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
2330                        bmc->id.manufacturer_id,
2331                        bmc->id.product_id,
2332                        bmc->id.device_id);
2333         } else {
2334                 char name[14];
2335                 unsigned char orig_dev_id = bmc->id.device_id;
2336                 int warn_printed = 0;
2337
2338                 snprintf(name, sizeof(name),
2339                          "ipmi_bmc.%4.4x", bmc->id.product_id);
2340
2341                 while (ipmi_find_bmc_prod_dev_id(&ipmidriver,
2342                                                  bmc->id.product_id,
2343                                                  bmc->id.device_id)) {
2344                         if (!warn_printed) {
2345                                 printk(KERN_WARNING PFX
2346                                        "This machine has two different BMCs"
2347                                        " with the same product id and device"
2348                                        " id.  This is an error in the"
2349                                        " firmware, but incrementing the"
2350                                        " device id to work around the problem."
2351                                        " Prod ID = 0x%x, Dev ID = 0x%x\n",
2352                                        bmc->id.product_id, bmc->id.device_id);
2353                                 warn_printed = 1;
2354                         }
2355                         bmc->id.device_id++; /* Wraps at 255 */
2356                         if (bmc->id.device_id == orig_dev_id) {
2357                                 printk(KERN_ERR PFX
2358                                        "Out of device ids!\n");
2359                                 break;
2360                         }
2361                 }
2362
2363                 bmc->dev = platform_device_alloc(name, bmc->id.device_id);
2364                 if (!bmc->dev) {
2365                         mutex_unlock(&ipmidriver_mutex);
2366                         printk(KERN_ERR
2367                                "ipmi_msghandler:"
2368                                " Unable to allocate platform device\n");
2369                         return -ENOMEM;
2370                 }
2371                 bmc->dev->dev.driver = &ipmidriver;
2372                 dev_set_drvdata(&bmc->dev->dev, bmc);
2373                 kref_init(&bmc->refcount);
2374
2375                 rv = platform_device_add(bmc->dev);
2376                 mutex_unlock(&ipmidriver_mutex);
2377                 if (rv) {
2378                         platform_device_put(bmc->dev);
2379                         bmc->dev = NULL;
2380                         printk(KERN_ERR
2381                                "ipmi_msghandler:"
2382                                " Unable to register bmc device: %d\n",
2383                                rv);
2384                         /* Don't go to out_err, you can only do that if
2385                            the device is registered already. */
2386                         return rv;
2387                 }
2388
2389                 rv = create_files(bmc);
2390                 if (rv) {
2391                         mutex_lock(&ipmidriver_mutex);
2392                         platform_device_unregister(bmc->dev);
2393                         mutex_unlock(&ipmidriver_mutex);
2394
2395                         return rv;
2396                 }
2397
2398                 printk(KERN_INFO
2399                        "ipmi: Found new BMC (man_id: 0x%6.6x, "
2400                        " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
2401                        bmc->id.manufacturer_id,
2402                        bmc->id.product_id,
2403                        bmc->id.device_id);
2404         }
2405
2406         /*
2407          * create symlink from system interface device to bmc device
2408          * and back.
2409          */
2410         intf->sysfs_name = kstrdup(sysfs_name, GFP_KERNEL);
2411         if (!intf->sysfs_name) {
2412                 rv = -ENOMEM;
2413                 printk(KERN_ERR
2414                        "ipmi_msghandler: allocate link to BMC: %d\n",
2415                        rv);
2416                 goto out_err;
2417         }
2418
2419         rv = sysfs_create_link(&intf->si_dev->kobj,
2420                                &bmc->dev->dev.kobj, intf->sysfs_name);
2421         if (rv) {
2422                 kfree(intf->sysfs_name);
2423                 intf->sysfs_name = NULL;
2424                 printk(KERN_ERR
2425                        "ipmi_msghandler: Unable to create bmc symlink: %d\n",
2426                        rv);
2427                 goto out_err;
2428         }
2429
2430         size = snprintf(dummy, 0, "ipmi%d", ifnum);
2431         intf->my_dev_name = kmalloc(size+1, GFP_KERNEL);
2432         if (!intf->my_dev_name) {
2433                 kfree(intf->sysfs_name);
2434                 intf->sysfs_name = NULL;
2435                 rv = -ENOMEM;
2436                 printk(KERN_ERR
2437                        "ipmi_msghandler: allocate link from BMC: %d\n",
2438                        rv);
2439                 goto out_err;
2440         }
2441         snprintf(intf->my_dev_name, size+1, "ipmi%d", ifnum);
2442
2443         rv = sysfs_create_link(&bmc->dev->dev.kobj, &intf->si_dev->kobj,
2444                                intf->my_dev_name);
2445         if (rv) {
2446                 kfree(intf->sysfs_name);
2447                 intf->sysfs_name = NULL;
2448                 kfree(intf->my_dev_name);
2449                 intf->my_dev_name = NULL;
2450                 printk(KERN_ERR
2451                        "ipmi_msghandler:"
2452                        " Unable to create symlink to bmc: %d\n",
2453                        rv);
2454                 goto out_err;
2455         }
2456
2457         return 0;
2458
2459 out_err:
2460         ipmi_bmc_unregister(intf);
2461         return rv;
2462 }
2463
2464 static int
2465 send_guid_cmd(ipmi_smi_t intf, int chan)
2466 {
2467         struct kernel_ipmi_msg            msg;
2468         struct ipmi_system_interface_addr si;
2469
2470         si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
2471         si.channel = IPMI_BMC_CHANNEL;
2472         si.lun = 0;
2473
2474         msg.netfn = IPMI_NETFN_APP_REQUEST;
2475         msg.cmd = IPMI_GET_DEVICE_GUID_CMD;
2476         msg.data = NULL;
2477         msg.data_len = 0;
2478         return i_ipmi_request(NULL,
2479                               intf,
2480                               (struct ipmi_addr *) &si,
2481                               0,
2482                               &msg,
2483                               intf,
2484                               NULL,
2485                               NULL,
2486                               0,
2487                               intf->channels[0].address,
2488                               intf->channels[0].lun,
2489                               -1, 0);
2490 }
2491
2492 static void
2493 guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
2494 {
2495         if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
2496             || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
2497             || (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD))
2498                 /* Not for me */
2499                 return;
2500
2501         if (msg->msg.data[0] != 0) {
2502                 /* Error from getting the GUID, the BMC doesn't have one. */
2503                 intf->bmc->guid_set = 0;
2504                 goto out;
2505         }
2506
2507         if (msg->msg.data_len < 17) {
2508                 intf->bmc->guid_set = 0;
2509                 printk(KERN_WARNING PFX
2510                        "guid_handler: The GUID response from the BMC was too"
2511                        " short, it was %d but should have been 17.  Assuming"
2512                        " GUID is not available.\n",
2513                        msg->msg.data_len);
2514                 goto out;
2515         }
2516
2517         memcpy(intf->bmc->guid, msg->msg.data, 16);
2518         intf->bmc->guid_set = 1;
2519  out:
2520         wake_up(&intf->waitq);
2521 }
2522
2523 static void
2524 get_guid(ipmi_smi_t intf)
2525 {
2526         int rv;
2527
2528         intf->bmc->guid_set = 0x2;
2529         intf->null_user_handler = guid_handler;
2530         rv = send_guid_cmd(intf, 0);
2531         if (rv)
2532                 /* Send failed, no GUID available. */
2533                 intf->bmc->guid_set = 0;
2534         wait_event(intf->waitq, intf->bmc->guid_set != 2);
2535         intf->null_user_handler = NULL;
2536 }
2537
2538 static int
2539 send_channel_info_cmd(ipmi_smi_t intf, int chan)
2540 {
2541         struct kernel_ipmi_msg            msg;
2542         unsigned char                     data[1];
2543         struct ipmi_system_interface_addr si;
2544
2545         si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
2546         si.channel = IPMI_BMC_CHANNEL;
2547         si.lun = 0;
2548
2549         msg.netfn = IPMI_NETFN_APP_REQUEST;
2550         msg.cmd = IPMI_GET_CHANNEL_INFO_CMD;
2551         msg.data = data;
2552         msg.data_len = 1;
2553         data[0] = chan;
2554         return i_ipmi_request(NULL,
2555                               intf,
2556                               (struct ipmi_addr *) &si,
2557                               0,
2558                               &msg,
2559                               intf,
2560                               NULL,
2561                               NULL,
2562                               0,
2563                               intf->channels[0].address,
2564                               intf->channels[0].lun,
2565                               -1, 0);
2566 }
2567
2568 static void
2569 channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
2570 {
2571         int rv = 0;
2572         int chan;
2573
2574         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
2575             && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
2576             && (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD))
2577         {
2578                 /* It's the one we want */
2579                 if (msg->msg.data[0] != 0) {
2580                         /* Got an error from the channel, just go on. */
2581
2582                         if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
2583                                 /* If the MC does not support this
2584                                    command, that is legal.  We just
2585                                    assume it has one IPMB at channel
2586                                    zero. */
2587                                 intf->channels[0].medium
2588                                         = IPMI_CHANNEL_MEDIUM_IPMB;
2589                                 intf->channels[0].protocol
2590                                         = IPMI_CHANNEL_PROTOCOL_IPMB;
2591                                 rv = -ENOSYS;
2592
2593                                 intf->curr_channel = IPMI_MAX_CHANNELS;
2594                                 wake_up(&intf->waitq);
2595                                 goto out;
2596                         }
2597                         goto next_channel;
2598                 }
2599                 if (msg->msg.data_len < 4) {
2600                         /* Message not big enough, just go on. */
2601                         goto next_channel;
2602                 }
2603                 chan = intf->curr_channel;
2604                 intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
2605                 intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;
2606
2607         next_channel:
2608                 intf->curr_channel++;
2609                 if (intf->curr_channel >= IPMI_MAX_CHANNELS)
2610                         wake_up(&intf->waitq);
2611                 else
2612                         rv = send_channel_info_cmd(intf, intf->curr_channel);
2613
2614                 if (rv) {
2615                         /* Got an error somehow, just give up. */
2616                         intf->curr_channel = IPMI_MAX_CHANNELS;
2617                         wake_up(&intf->waitq);
2618
2619                         printk(KERN_WARNING PFX
2620                                "Error sending channel information: %d\n",
2621                                rv);
2622                 }
2623         }
2624  out:
2625         return;
2626 }
2627
2628 int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
2629                       void                     *send_info,
2630                       struct ipmi_device_id    *device_id,
2631                       struct device            *si_dev,
2632                       const char               *sysfs_name,
2633                       unsigned char            slave_addr)
2634 {
2635         int              i, j;
2636         int              rv;
2637         ipmi_smi_t       intf;
2638         ipmi_smi_t       tintf;
2639         struct list_head *link;
2640
2641         /* Make sure the driver is actually initialized, this handles
2642            problems with initialization order. */
2643         if (!initialized) {
2644                 rv = ipmi_init_msghandler();
2645                 if (rv)
2646                         return rv;
2647                 /* The init code doesn't return an error if it was turned
2648                    off, but it won't initialize.  Check that. */
2649                 if (!initialized)
2650                         return -ENODEV;
2651         }
2652
2653         intf = kmalloc(sizeof(*intf), GFP_KERNEL);
2654         if (!intf)
2655                 return -ENOMEM;
2656         memset(intf, 0, sizeof(*intf));
2657
2658         intf->ipmi_version_major = ipmi_version_major(device_id);
2659         intf->ipmi_version_minor = ipmi_version_minor(device_id);
2660
2661         intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
2662         if (!intf->bmc) {
2663                 kfree(intf);
2664                 return -ENOMEM;
2665         }
2666         intf->intf_num = -1; /* Mark it invalid for now. */
2667         kref_init(&intf->refcount);
2668         intf->bmc->id = *device_id;
2669         intf->si_dev = si_dev;
2670         for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
2671                 intf->channels[j].address = IPMI_BMC_SLAVE_ADDR;
2672                 intf->channels[j].lun = 2;
2673         }
2674         if (slave_addr != 0)
2675                 intf->channels[0].address = slave_addr;
2676         INIT_LIST_HEAD(&intf->users);
2677         intf->handlers = handlers;
2678         intf->send_info = send_info;
2679         spin_lock_init(&intf->seq_lock);
2680         for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) {
2681                 intf->seq_table[j].inuse = 0;
2682                 intf->seq_table[j].seqid = 0;
2683         }
2684         intf->curr_seq = 0;
2685 #ifdef CONFIG_PROC_FS
2686         spin_lock_init(&intf->proc_entry_lock);
2687 #endif
2688         spin_lock_init(&intf->waiting_msgs_lock);
2689         INIT_LIST_HEAD(&intf->waiting_msgs);
2690         spin_lock_init(&intf->events_lock);
2691         INIT_LIST_HEAD(&intf->waiting_events);
2692         intf->waiting_events_count = 0;
2693         mutex_init(&intf->cmd_rcvrs_mutex);
2694         spin_lock_init(&intf->maintenance_mode_lock);
2695         INIT_LIST_HEAD(&intf->cmd_rcvrs);
2696         init_waitqueue_head(&intf->waitq);
2697
2698         spin_lock_init(&intf->counter_lock);
2699         intf->proc_dir = NULL;
2700
2701         mutex_lock(&smi_watchers_mutex);
2702         mutex_lock(&ipmi_interfaces_mutex);
2703         /* Look for a hole in the numbers. */
2704         i = 0;
2705         link = &ipmi_interfaces;
2706         list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) {
2707                 if (tintf->intf_num != i) {
2708                         link = &tintf->link;
2709                         break;
2710                 }
2711                 i++;
2712         }
2713         /* Add the new interface in numeric order. */
2714         if (i == 0)
2715                 list_add_rcu(&intf->link, &ipmi_interfaces);
2716         else
2717                 list_add_tail_rcu(&intf->link, link);
2718
2719         rv = handlers->start_processing(send_info, intf);
2720         if (rv)
2721                 goto out;
2722
2723         get_guid(intf);
2724
2725         if ((intf->ipmi_version_major > 1)
2726             || ((intf->ipmi_version_major == 1)
2727                 && (intf->ipmi_version_minor >= 5)))
2728         {
2729                 /* Start scanning the channels to see what is
2730                    available. */
2731                 intf->null_user_handler = channel_handler;
2732                 intf->curr_channel = 0;
2733                 rv = send_channel_info_cmd(intf, 0);
2734                 if (rv)
2735                         goto out;
2736
2737                 /* Wait for the channel info to be read. */
2738                 wait_event(intf->waitq,
2739                            intf->curr_channel >= IPMI_MAX_CHANNELS);
2740                 intf->null_user_handler = NULL;
2741         } else {
2742                 /* Assume a single IPMB channel at zero. */
2743                 intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
2744                 intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
2745         }
2746
2747         if (rv == 0)
2748                 rv = add_proc_entries(intf, i);
2749
2750         rv = ipmi_bmc_register(intf, i, sysfs_name);
2751
2752  out:
2753         if (rv) {
2754                 if (intf->proc_dir)
2755                         remove_proc_entries(intf);
2756                 intf->handlers = NULL;
2757                 list_del_rcu(&intf->link);
2758                 mutex_unlock(&ipmi_interfaces_mutex);
2759                 mutex_unlock(&smi_watchers_mutex);
2760                 synchronize_rcu();
2761                 kref_put(&intf->refcount, intf_free);
2762         } else {
2763                 /* After this point the interface is legal to use. */
2764                 intf->intf_num = i;
2765                 mutex_unlock(&ipmi_interfaces_mutex);
2766                 call_smi_watchers(i, intf->si_dev);
2767                 mutex_unlock(&smi_watchers_mutex);
2768         }
2769
2770         return rv;
2771 }
2772
2773 static void cleanup_smi_msgs(ipmi_smi_t intf)
2774 {
2775         int              i;
2776         struct seq_table *ent;
2777
2778         /* No need for locks, the interface is down. */
2779         for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
2780                 ent = &(intf->seq_table[i]);
2781                 if (!ent->inuse)
2782                         continue;
2783                 deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED);
2784         }
2785 }
2786
2787 int ipmi_unregister_smi(ipmi_smi_t intf)
2788 {
2789         struct ipmi_smi_watcher *w;
2790         int    intf_num = intf->intf_num;
2791
2792         ipmi_bmc_unregister(intf);
2793
2794         mutex_lock(&smi_watchers_mutex);
2795         mutex_lock(&ipmi_interfaces_mutex);
2796         intf->intf_num = -1;
2797         intf->handlers = NULL;
2798         list_del_rcu(&intf->link);
2799         mutex_unlock(&ipmi_interfaces_mutex);
2800         synchronize_rcu();
2801
2802         cleanup_smi_msgs(intf);
2803
2804         remove_proc_entries(intf);
2805
2806         /* Call all the watcher interfaces to tell them that
2807            an interface is gone. */
2808         list_for_each_entry(w, &smi_watchers, link)
2809                 w->smi_gone(intf_num);
2810         mutex_unlock(&smi_watchers_mutex);
2811
2812         kref_put(&intf->refcount, intf_free);
2813         return 0;
2814 }
2815
2816 static int handle_ipmb_get_msg_rsp(ipmi_smi_t          intf,
2817                                    struct ipmi_smi_msg *msg)
2818 {
2819         struct ipmi_ipmb_addr ipmb_addr;
2820         struct ipmi_recv_msg  *recv_msg;
2821         unsigned long         flags;
2822
2823
2824         /* This is 11, not 10, because the response must contain a
2825          * completion code. */
2826         if (msg->rsp_size < 11) {
2827                 /* Message not big enough, just ignore it. */
2828                 spin_lock_irqsave(&intf->counter_lock, flags);
2829                 intf->invalid_ipmb_responses++;
2830                 spin_unlock_irqrestore(&intf->counter_lock, flags);
2831                 return 0;
2832         }
2833
2834         if (msg->rsp[2] != 0) {
2835                 /* An error getting the response, just ignore it. */
2836                 return 0;
2837         }
2838
2839         ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
2840         ipmb_addr.slave_addr = msg->rsp[6];
2841         ipmb_addr.channel = msg->rsp[3] & 0x0f;
2842         ipmb_addr.lun = msg->rsp[7] & 3;
2843
2844         /* It's a response from a remote entity.  Look up the sequence
2845            number and handle the response. */
2846         if (intf_find_seq(intf,
2847                           msg->rsp[7] >> 2,
2848                           msg->rsp[3] & 0x0f,
2849                           msg->rsp[8],
2850                           (msg->rsp[4] >> 2) & (~1),
2851                           (struct ipmi_addr *) &(ipmb_addr),
2852                           &recv_msg))
2853         {
2854                 /* We were unable to find the sequence number,
2855                    so just nuke the message. */
2856                 spin_lock_irqsave(&intf->counter_lock, flags);
2857                 intf->unhandled_ipmb_responses++;
2858                 spin_unlock_irqrestore(&intf->counter_lock, flags);
2859                 return 0;
2860         }
2861
2862         memcpy(recv_msg->msg_data,
2863                &(msg->rsp[9]),
2864                msg->rsp_size - 9);
2865         /* THe other fields matched, so no need to set them, except
2866            for netfn, which needs to be the response that was
2867            returned, not the request value. */
2868         recv_msg->msg.netfn = msg->rsp[4] >> 2;
2869         recv_msg->msg.data = recv_msg->msg_data;
2870         recv_msg->msg.data_len = msg->rsp_size - 10;
2871         recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
2872         spin_lock_irqsave(&intf->counter_lock, flags);
2873         intf->handled_ipmb_responses++;
2874         spin_unlock_irqrestore(&intf->counter_lock, flags);
2875         deliver_response(recv_msg);
2876
2877         return 0;
2878 }
2879
2880 static int handle_ipmb_get_msg_cmd(ipmi_smi_t          intf,
2881                                    struct ipmi_smi_msg *msg)
2882 {
2883         struct cmd_rcvr          *rcvr;
2884         int                      rv = 0;
2885         unsigned char            netfn;
2886         unsigned char            cmd;
2887         unsigned char            chan;
2888         ipmi_user_t              user = NULL;
2889         struct ipmi_ipmb_addr    *ipmb_addr;
2890         struct ipmi_recv_msg     *recv_msg;
2891         unsigned long            flags;
2892         struct ipmi_smi_handlers *handlers;
2893
2894         if (msg->rsp_size < 10) {
2895                 /* Message not big enough, just ignore it. */
2896                 spin_lock_irqsave(&intf->counter_lock, flags);
2897                 intf->invalid_commands++;
2898                 spin_unlock_irqrestore(&intf->counter_lock, flags);
2899                 return 0;
2900         }
2901
2902         if (msg->rsp[2] != 0) {
2903                 /* An error getting the response, just ignore it. */
2904                 return 0;
2905         }
2906
2907         netfn = msg->rsp[4] >> 2;
2908         cmd = msg->rsp[8];
2909         chan = msg->rsp[3] & 0xf;
2910
2911         rcu_read_lock();
2912         rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
2913         if (rcvr) {
2914                 user = rcvr->user;
2915                 kref_get(&user->refcount);
2916         } else
2917                 user = NULL;
2918         rcu_read_unlock();
2919
2920         if (user == NULL) {
2921                 /* We didn't find a user, deliver an error response. */
2922                 spin_lock_irqsave(&intf->counter_lock, flags);
2923                 intf->unhandled_commands++;
2924                 spin_unlock_irqrestore(&intf->counter_lock, flags);
2925
2926                 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
2927                 msg->data[1] = IPMI_SEND_MSG_CMD;
2928                 msg->data[2] = msg->rsp[3];
2929                 msg->data[3] = msg->rsp[6];
2930                 msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3);
2931                 msg->data[5] = ipmb_checksum(&(msg->data[3]), 2);
2932                 msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address;
2933                 /* rqseq/lun */
2934                 msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3);
2935                 msg->data[8] = msg->rsp[8]; /* cmd */
2936                 msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE;
2937                 msg->data[10] = ipmb_checksum(&(msg->data[6]), 4);
2938                 msg->data_size = 11;
2939
2940 #ifdef DEBUG_MSGING
2941         {
2942                 int m;
2943                 printk("Invalid command:");
2944                 for (m = 0; m < msg->data_size; m++)
2945                         printk(" %2.2x", msg->data[m]);
2946                 printk("\n");
2947         }
2948 #endif
2949                 rcu_read_lock();
2950                 handlers = intf->handlers;
2951                 if (handlers) {
2952                         handlers->sender(intf->send_info, msg, 0);
2953                         /* We used the message, so return the value
2954                            that causes it to not be freed or
2955                            queued. */
2956                         rv = -1;
2957                 }
2958                 rcu_read_unlock();
2959         } else {
2960                 /* Deliver the message to the user. */
2961                 spin_lock_irqsave(&intf->counter_lock, flags);
2962                 intf->handled_commands++;
2963                 spin_unlock_irqrestore(&intf->counter_lock, flags);
2964
2965                 recv_msg = ipmi_alloc_recv_msg();
2966                 if (!recv_msg) {
2967                         /* We couldn't allocate memory for the
2968                            message, so requeue it for handling
2969                            later. */
2970                         rv = 1;
2971                         kref_put(&user->refcount, free_user);
2972                 } else {
2973                         /* Extract the source address from the data. */
2974                         ipmb_addr = (struct ipmi_ipmb_addr *) &recv_msg->addr;
2975                         ipmb_addr->addr_type = IPMI_IPMB_ADDR_TYPE;
2976                         ipmb_addr->slave_addr = msg->rsp[6];
2977                         ipmb_addr->lun = msg->rsp[7] & 3;
2978                         ipmb_addr->channel = msg->rsp[3] & 0xf;
2979
2980                         /* Extract the rest of the message information
2981                            from the IPMB header.*/
2982                         recv_msg->user = user;
2983                         recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
2984                         recv_msg->msgid = msg->rsp[7] >> 2;
2985                         recv_msg->msg.netfn = msg->rsp[4] >> 2;
2986                         recv_msg->msg.cmd = msg->rsp[8];
2987                         recv_msg->msg.data = recv_msg->msg_data;
2988
2989                         /* We chop off 10, not 9 bytes because the checksum
2990                            at the end also needs to be removed. */
2991                         recv_msg->msg.data_len = msg->rsp_size - 10;
2992                         memcpy(recv_msg->msg_data,
2993                                &(msg->rsp[9]),
2994                                msg->rsp_size - 10);
2995                         deliver_response(recv_msg);
2996                 }
2997         }
2998
2999         return rv;
3000 }
3001
3002 static int handle_lan_get_msg_rsp(ipmi_smi_t          intf,
3003                                   struct ipmi_smi_msg *msg)
3004 {
3005         struct ipmi_lan_addr  lan_addr;
3006         struct ipmi_recv_msg  *recv_msg;
3007         unsigned long         flags;
3008
3009
3010         /* This is 13, not 12, because the response must contain a
3011          * completion code. */
3012         if (msg->rsp_size < 13) {
3013                 /* Message not big enough, just ignore it. */
3014                 spin_lock_irqsave(&intf->counter_lock, flags);
3015                 intf->invalid_lan_responses++;
3016                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3017                 return 0;
3018         }
3019
3020         if (msg->rsp[2] != 0) {
3021                 /* An error getting the response, just ignore it. */
3022                 return 0;
3023         }
3024
3025         lan_addr.addr_type = IPMI_LAN_ADDR_TYPE;
3026         lan_addr.session_handle = msg->rsp[4];
3027         lan_addr.remote_SWID = msg->rsp[8];
3028         lan_addr.local_SWID = msg->rsp[5];
3029         lan_addr.channel = msg->rsp[3] & 0x0f;
3030         lan_addr.privilege = msg->rsp[3] >> 4;
3031         lan_addr.lun = msg->rsp[9] & 3;
3032
3033         /* It's a response from a remote entity.  Look up the sequence
3034            number and handle the response. */
3035         if (intf_find_seq(intf,
3036                           msg->rsp[9] >> 2,
3037                           msg->rsp[3] & 0x0f,
3038                           msg->rsp[10],
3039                           (msg->rsp[6] >> 2) & (~1),
3040                           (struct ipmi_addr *) &(lan_addr),
3041                           &recv_msg))
3042         {
3043                 /* We were unable to find the sequence number,
3044                    so just nuke the message. */
3045                 spin_lock_irqsave(&intf->counter_lock, flags);
3046                 intf->unhandled_lan_responses++;
3047                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3048                 return 0;
3049         }
3050
3051         memcpy(recv_msg->msg_data,
3052                &(msg->rsp[11]),
3053                msg->rsp_size - 11);
3054         /* The other fields matched, so no need to set them, except
3055            for netfn, which needs to be the response that was
3056            returned, not the request value. */
3057         recv_msg->msg.netfn = msg->rsp[6] >> 2;
3058         recv_msg->msg.data = recv_msg->msg_data;
3059         recv_msg->msg.data_len = msg->rsp_size - 12;
3060         recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
3061         spin_lock_irqsave(&intf->counter_lock, flags);
3062         intf->handled_lan_responses++;
3063         spin_unlock_irqrestore(&intf->counter_lock, flags);
3064         deliver_response(recv_msg);
3065
3066         return 0;
3067 }
3068
3069 static int handle_lan_get_msg_cmd(ipmi_smi_t          intf,
3070                                   struct ipmi_smi_msg *msg)
3071 {
3072         struct cmd_rcvr          *rcvr;
3073         int                      rv = 0;
3074         unsigned char            netfn;
3075         unsigned char            cmd;
3076         unsigned char            chan;
3077         ipmi_user_t              user = NULL;
3078         struct ipmi_lan_addr     *lan_addr;
3079         struct ipmi_recv_msg     *recv_msg;
3080         unsigned long            flags;
3081
3082         if (msg->rsp_size < 12) {
3083                 /* Message not big enough, just ignore it. */
3084                 spin_lock_irqsave(&intf->counter_lock, flags);
3085                 intf->invalid_commands++;
3086                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3087                 return 0;
3088         }
3089
3090         if (msg->rsp[2] != 0) {
3091                 /* An error getting the response, just ignore it. */
3092                 return 0;
3093         }
3094
3095         netfn = msg->rsp[6] >> 2;
3096         cmd = msg->rsp[10];
3097         chan = msg->rsp[3] & 0xf;
3098
3099         rcu_read_lock();
3100         rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3101         if (rcvr) {
3102                 user = rcvr->user;
3103                 kref_get(&user->refcount);
3104         } else
3105                 user = NULL;
3106         rcu_read_unlock();
3107
3108         if (user == NULL) {
3109                 /* We didn't find a user, just give up. */
3110                 spin_lock_irqsave(&intf->counter_lock, flags);
3111                 intf->unhandled_commands++;
3112                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3113
3114                 rv = 0; /* Don't do anything with these messages, just
3115                            allow them to be freed. */
3116         } else {
3117                 /* Deliver the message to the user. */
3118                 spin_lock_irqsave(&intf->counter_lock, flags);
3119                 intf->handled_commands++;
3120                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3121
3122                 recv_msg = ipmi_alloc_recv_msg();
3123                 if (!recv_msg) {
3124                         /* We couldn't allocate memory for the
3125                            message, so requeue it for handling
3126                            later. */
3127                         rv = 1;
3128                         kref_put(&user->refcount, free_user);
3129                 } else {
3130                         /* Extract the source address from the data. */
3131                         lan_addr = (struct ipmi_lan_addr *) &recv_msg->addr;
3132                         lan_addr->addr_type = IPMI_LAN_ADDR_TYPE;
3133                         lan_addr->session_handle = msg->rsp[4];
3134                         lan_addr->remote_SWID = msg->rsp[8];
3135                         lan_addr->local_SWID = msg->rsp[5];
3136                         lan_addr->lun = msg->rsp[9] & 3;
3137                         lan_addr->channel = msg->rsp[3] & 0xf;
3138                         lan_addr->privilege = msg->rsp[3] >> 4;
3139
3140                         /* Extract the rest of the message information
3141                            from the IPMB header.*/
3142                         recv_msg->user = user;
3143                         recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
3144                         recv_msg->msgid = msg->rsp[9] >> 2;
3145                         recv_msg->msg.netfn = msg->rsp[6] >> 2;
3146                         recv_msg->msg.cmd = msg->rsp[10];
3147                         recv_msg->msg.data = recv_msg->msg_data;
3148
3149                         /* We chop off 12, not 11 bytes because the checksum
3150                            at the end also needs to be removed. */
3151                         recv_msg->msg.data_len = msg->rsp_size - 12;
3152                         memcpy(recv_msg->msg_data,
3153                                &(msg->rsp[11]),
3154                                msg->rsp_size - 12);
3155                         deliver_response(recv_msg);
3156                 }
3157         }
3158
3159         return rv;
3160 }
3161
3162 static void copy_event_into_recv_msg(struct ipmi_recv_msg *recv_msg,
3163                                      struct ipmi_smi_msg  *msg)
3164 {
3165         struct ipmi_system_interface_addr *smi_addr;
3166
3167         recv_msg->msgid = 0;
3168         smi_addr = (struct ipmi_system_interface_addr *) &(recv_msg->addr);
3169         smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3170         smi_addr->channel = IPMI_BMC_CHANNEL;
3171         smi_addr->lun = msg->rsp[0] & 3;
3172         recv_msg->recv_type = IPMI_ASYNC_EVENT_RECV_TYPE;
3173         recv_msg->msg.netfn = msg->rsp[0] >> 2;
3174         recv_msg->msg.cmd = msg->rsp[1];
3175         memcpy(recv_msg->msg_data, &(msg->rsp[3]), msg->rsp_size - 3);
3176         recv_msg->msg.data = recv_msg->msg_data;
3177         recv_msg->msg.data_len = msg->rsp_size - 3;
3178 }
3179
3180 static int handle_read_event_rsp(ipmi_smi_t          intf,
3181                                  struct ipmi_smi_msg *msg)
3182 {
3183         struct ipmi_recv_msg *recv_msg, *recv_msg2;
3184         struct list_head     msgs;
3185         ipmi_user_t          user;
3186         int                  rv = 0;
3187         int                  deliver_count = 0;
3188         unsigned long        flags;
3189
3190         if (msg->rsp_size < 19) {
3191                 /* Message is too small to be an IPMB event. */
3192                 spin_lock_irqsave(&intf->counter_lock, flags);
3193                 intf->invalid_events++;
3194                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3195                 return 0;
3196         }
3197
3198         if (msg->rsp[2] != 0) {
3199                 /* An error getting the event, just ignore it. */
3200                 return 0;
3201         }
3202
3203         INIT_LIST_HEAD(&msgs);
3204
3205         spin_lock_irqsave(&intf->events_lock, flags);
3206
3207         spin_lock(&intf->counter_lock);
3208         intf->events++;
3209         spin_unlock(&intf->counter_lock);
3210
3211         /* Allocate and fill in one message for every user that is getting
3212            events. */
3213         rcu_read_lock();
3214         list_for_each_entry_rcu(user, &intf->users, link) {
3215                 if (!user->gets_events)
3216                         continue;
3217
3218                 recv_msg = ipmi_alloc_recv_msg();
3219                 if (!recv_msg) {
3220                         rcu_read_unlock();
3221                         list_for_each_entry_safe(recv_msg, recv_msg2, &msgs,
3222                                                  link) {
3223                                 list_del(&recv_msg->link);
3224                                 ipmi_free_recv_msg(recv_msg);
3225                         }
3226                         /* We couldn't allocate memory for the
3227                            message, so requeue it for handling
3228                            later. */
3229                         rv = 1;
3230                         goto out;
3231                 }
3232
3233                 deliver_count++;
3234
3235                 copy_event_into_recv_msg(recv_msg, msg);
3236                 recv_msg->user = user;
3237                 kref_get(&user->refcount);
3238                 list_add_tail(&(recv_msg->link), &msgs);
3239         }
3240         rcu_read_unlock();
3241
3242         if (deliver_count) {
3243                 /* Now deliver all the messages. */
3244                 list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, link) {
3245                         list_del(&recv_msg->link);
3246                         deliver_response(recv_msg);
3247                 }
3248         } else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) {
3249                 /* No one to receive the message, put it in queue if there's
3250                    not already too many things in the queue. */
3251                 recv_msg = ipmi_alloc_recv_msg();
3252                 if (!recv_msg) {
3253                         /* We couldn't allocate memory for the
3254                            message, so requeue it for handling
3255                            later. */
3256                         rv = 1;
3257                         goto out;
3258                 }
3259
3260                 copy_event_into_recv_msg(recv_msg, msg);
3261                 list_add_tail(&(recv_msg->link), &(intf->waiting_events));
3262                 intf->waiting_events_count++;
3263         } else {
3264                 /* There's too many things in the queue, discard this
3265                    message. */
3266                 printk(KERN_WARNING PFX "Event queue full, discarding an"
3267                        " incoming event\n");
3268         }
3269
3270  out:
3271         spin_unlock_irqrestore(&(intf->events_lock), flags);
3272
3273         return rv;
3274 }
3275
3276 static int handle_bmc_rsp(ipmi_smi_t          intf,
3277                           struct ipmi_smi_msg *msg)
3278 {
3279         struct ipmi_recv_msg *recv_msg;
3280         unsigned long        flags;
3281         struct ipmi_user     *user;
3282
3283         recv_msg = (struct ipmi_recv_msg *) msg->user_data;
3284         if (recv_msg == NULL)
3285         {
3286                 printk(KERN_WARNING"IPMI message received with no owner. This\n"
3287                         "could be because of a malformed message, or\n"
3288                         "because of a hardware error.  Contact your\n"
3289                         "hardware vender for assistance\n");
3290                 return 0;
3291         }
3292
3293         user = recv_msg->user;
3294         /* Make sure the user still exists. */
3295         if (user && !user->valid) {
3296                 /* The user for the message went away, so give up. */
3297                 spin_lock_irqsave(&intf->counter_lock, flags);
3298                 intf->unhandled_local_responses++;
3299                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3300                 ipmi_free_recv_msg(recv_msg);
3301         } else {
3302                 struct ipmi_system_interface_addr *smi_addr;
3303
3304                 spin_lock_irqsave(&intf->counter_lock, flags);
3305                 intf->handled_local_responses++;
3306                 spin_unlock_irqrestore(&intf->counter_lock, flags);
3307                 recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
3308                 recv_msg->msgid = msg->msgid;
3309                 smi_addr = ((struct ipmi_system_interface_addr *)
3310                             &(recv_msg->addr));
3311                 smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3312                 smi_addr->channel = IPMI_BMC_CHANNEL;
3313                 smi_addr->lun = msg->rsp[0] & 3;
3314                 recv_msg->msg.netfn = msg->rsp[0] >> 2;
3315                 recv_msg->msg.cmd = msg->rsp[1];
3316                 memcpy(recv_msg->msg_data,
3317                        &(msg->rsp[2]),
3318                        msg->rsp_size - 2);
3319                 recv_msg->msg.data = recv_msg->msg_data;
3320                 recv_msg->msg.data_len = msg->rsp_size - 2;
3321                 deliver_response(recv_msg);
3322         }
3323
3324         return 0;
3325 }
3326
3327 /* Handle a new message.  Return 1 if the message should be requeued,
3328    0 if the message should be freed, or -1 if the message should not
3329    be freed or requeued. */
3330 static int handle_new_recv_msg(ipmi_smi_t          intf,
3331                                struct ipmi_smi_msg *msg)
3332 {
3333         int requeue;
3334         int chan;
3335
3336 #ifdef DEBUG_MSGING
3337         int m;
3338         printk("Recv:");
3339         for (m = 0; m < msg->rsp_size; m++)
3340                 printk(" %2.2x", msg->rsp[m]);
3341         printk("\n");
3342 #endif
3343         if (msg->rsp_size < 2) {
3344                 /* Message is too small to be correct. */
3345                 printk(KERN_WARNING PFX "BMC returned to small a message"
3346                        " for netfn %x cmd %x, got %d bytes\n",
3347                        (msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);
3348
3349                 /* Generate an error response for the message. */
3350                 msg->rsp[0] = msg->data[0] | (1 << 2);
3351                 msg->rsp[1] = msg->data[1];
3352                 msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
3353                 msg->rsp_size = 3;
3354         } else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))/* Netfn */
3355                    || (msg->rsp[1] != msg->data[1]))              /* Command */
3356         {
3357                 /* The response is not even marginally correct. */
3358                 printk(KERN_WARNING PFX "BMC returned incorrect response,"
3359                        " expected netfn %x cmd %x, got netfn %x cmd %x\n",
3360                        (msg->data[0] >> 2) | 1, msg->data[1],
3361                        msg->rsp[0] >> 2, msg->rsp[1]);
3362
3363                 /* Generate an error response for the message. */
3364                 msg->rsp[0] = msg->data[0] | (1 << 2);
3365                 msg->rsp[1] = msg->data[1];
3366                 msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
3367                 msg->rsp_size = 3;
3368         }
3369
3370         if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3371             && (msg->rsp[1] == IPMI_SEND_MSG_CMD)
3372             && (msg->user_data != NULL))
3373         {
3374                 /* It's a response to a response we sent.  For this we
3375                    deliver a send message response to the user. */
3376                 struct ipmi_recv_msg     *recv_msg = msg->user_data;
3377
3378                 requeue = 0;
3379                 if (msg->rsp_size < 2)
3380                         /* Message is too small to be correct. */
3381                         goto out;
3382
3383                 chan = msg->data[2] & 0x0f;
3384                 if (chan >= IPMI_MAX_CHANNELS)
3385                         /* Invalid channel number */
3386                         goto out;
3387
3388                 if (!recv_msg)
3389                         goto out;
3390
3391                 /* Make sure the user still exists. */
3392                 if (!recv_msg->user || !recv_msg->user->valid)
3393                         goto out;
3394
3395                 recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE;
3396                 recv_msg->msg.data = recv_msg->msg_data;
3397                 recv_msg->msg.data_len = 1;
3398                 recv_msg->msg_data[0] = msg->rsp[2];
3399                 deliver_response(recv_msg);
3400         } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3401                    && (msg->rsp[1] == IPMI_GET_MSG_CMD))
3402         {
3403                 /* It's from the receive queue. */
3404                 chan = msg->rsp[3] & 0xf;
3405                 if (chan >= IPMI_MAX_CHANNELS) {
3406                         /* Invalid channel number */
3407                         requeue = 0;
3408                         goto out;
3409                 }
3410
3411                 switch (intf->channels[chan].medium) {
3412                 case IPMI_CHANNEL_MEDIUM_IPMB:
3413                         if (msg->rsp[4] & 0x04) {
3414                                 /* It's a response, so find the
3415                                    requesting message and send it up. */
3416                                 requeue = handle_ipmb_get_msg_rsp(intf, msg);
3417                         } else {
3418                                 /* It's a command to the SMS from some other
3419                                    entity.  Handle that. */
3420                                 requeue = handle_ipmb_get_msg_cmd(intf, msg);
3421                         }
3422                         break;
3423
3424                 case IPMI_CHANNEL_MEDIUM_8023LAN:
3425                 case IPMI_CHANNEL_MEDIUM_ASYNC:
3426                         if (msg->rsp[6] & 0x04) {
3427                                 /* It's a response, so find the
3428                                    requesting message and send it up. */
3429                                 requeue = handle_lan_get_msg_rsp(intf, msg);
3430                         } else {
3431                                 /* It's a command to the SMS from some other
3432                                    entity.  Handle that. */
3433                                 requeue = handle_lan_get_msg_cmd(intf, msg);
3434                         }
3435                         break;
3436
3437                 default:
3438                         /* We don't handle the channel type, so just
3439                          * free the message. */
3440                         requeue = 0;
3441                 }
3442
3443         } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3444                    && (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD))
3445         {
3446                 /* It's an asyncronous event. */
3447                 requeue = handle_read_event_rsp(intf, msg);
3448         } else {
3449                 /* It's a response from the local BMC. */
3450                 requeue = handle_bmc_rsp(intf, msg);
3451         }
3452
3453  out:
3454         return requeue;
3455 }
3456
3457 /* Handle a new message from the lower layer. */
3458 void ipmi_smi_msg_received(ipmi_smi_t          intf,
3459                            struct ipmi_smi_msg *msg)
3460 {
3461         unsigned long flags;
3462         int           rv;
3463
3464
3465         if ((msg->data_size >= 2)
3466             && (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
3467             && (msg->data[1] == IPMI_SEND_MSG_CMD)
3468             && (msg->user_data == NULL))
3469         {
3470                 /* This is the local response to a command send, start
3471                    the timer for these.  The user_data will not be
3472                    NULL if this is a response send, and we will let
3473                    response sends just go through. */
3474
3475                 /* Check for errors, if we get certain errors (ones
3476                    that mean basically we can try again later), we
3477                    ignore them and start the timer.  Otherwise we
3478                    report the error immediately. */
3479                 if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0)
3480                     && (msg->rsp[2] != IPMI_NODE_BUSY_ERR)
3481                     && (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR)
3482                     && (msg->rsp[2] != IPMI_BUS_ERR)
3483                     && (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR))
3484                 {
3485                         int chan = msg->rsp[3] & 0xf;
3486
3487                         /* Got an error sending the message, handle it. */
3488                         spin_lock_irqsave(&intf->counter_lock, flags);
3489                         if (chan >= IPMI_MAX_CHANNELS)
3490                                 ; /* This shouldn't happen */
3491                         else if ((intf->channels[chan].medium
3492                                   == IPMI_CHANNEL_MEDIUM_8023LAN)
3493                                  || (intf->channels[chan].medium
3494                                      == IPMI_CHANNEL_MEDIUM_ASYNC))
3495                                 intf->sent_lan_command_errs++;
3496                         else
3497                                 intf->sent_ipmb_command_errs++;
3498                         spin_unlock_irqrestore(&intf->counter_lock, flags);
3499                         intf_err_seq(intf, msg->msgid, msg->rsp[2]);
3500                 } else {
3501                         /* The message was sent, start the timer. */
3502                         intf_start_seq_timer(intf, msg->msgid);
3503                 }
3504
3505                 ipmi_free_smi_msg(msg);
3506                 goto out;
3507         }
3508
3509         /* To preserve message order, if the list is not empty, we
3510            tack this message onto the end of the list. */
3511         spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
3512         if (!list_empty(&intf->waiting_msgs)) {
3513                 list_add_tail(&msg->link, &intf->waiting_msgs);
3514                 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);
3515                 goto out;
3516         }
3517         spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);
3518
3519         rv = handle_new_recv_msg(intf, msg);
3520         if (rv > 0) {
3521                 /* Could not handle the message now, just add it to a
3522                    list to handle later. */
3523                 spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
3524                 list_add_tail(&msg->link, &intf->waiting_msgs);
3525                 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);
3526         } else if (rv == 0) {
3527                 ipmi_free_smi_msg(msg);
3528         }
3529
3530  out:
3531         return;
3532 }
3533
3534 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf)
3535 {
3536         ipmi_user_t user;
3537
3538         rcu_read_lock();
3539         list_for_each_entry_rcu(user, &intf->users, link) {
3540                 if (!user->handler->ipmi_watchdog_pretimeout)
3541                         continue;
3542
3543                 user->handler->ipmi_watchdog_pretimeout(user->handler_data);
3544         }
3545         rcu_read_unlock();
3546 }
3547
3548
3549 static struct ipmi_smi_msg *
3550 smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg,
3551                   unsigned char seq, long seqid)
3552 {
3553         struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg();
3554         if (!smi_msg)
3555                 /* If we can't allocate the message, then just return, we
3556                    get 4 retries, so this should be ok. */
3557                 return NULL;
3558
3559         memcpy(smi_msg->data, recv_msg->msg.data, recv_msg->msg.data_len);
3560         smi_msg->data_size = recv_msg->msg.data_len;
3561         smi_msg->msgid = STORE_SEQ_IN_MSGID(seq, seqid);
3562
3563 #ifdef DEBUG_MSGING
3564         {
3565                 int m;
3566                 printk("Resend: ");
3567                 for (m = 0; m < smi_msg->data_size; m++)
3568                         printk(" %2.2x", smi_msg->data[m]);
3569                 printk("\n");
3570         }
3571 #endif
3572         return smi_msg;
3573 }
3574
3575 static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
3576                               struct list_head *timeouts, long timeout_period,
3577                               int slot, unsigned long *flags)
3578 {
3579         struct ipmi_recv_msg     *msg;
3580         struct ipmi_smi_handlers *handlers;
3581
3582         if (intf->intf_num == -1)
3583                 return;
3584
3585         if (!ent->inuse)
3586                 return;
3587
3588         ent->timeout -= timeout_period;
3589         if (ent->timeout > 0)
3590                 return;
3591
3592         if (ent->retries_left == 0) {
3593                 /* The message has used all its retries. */
3594                 ent->inuse = 0;
3595                 msg = ent->recv_msg;
3596                 list_add_tail(&msg->link, timeouts);
3597                 spin_lock(&intf->counter_lock);
3598                 if (ent->broadcast)
3599                         intf->timed_out_ipmb_broadcasts++;
3600                 else if (ent->recv_msg->addr.addr_type == IPMI_LAN_ADDR_TYPE)
3601                         intf->timed_out_lan_commands++;
3602                 else
3603                         intf->timed_out_ipmb_commands++;
3604                 spin_unlock(&intf->counter_lock);
3605         } else {
3606                 struct ipmi_smi_msg *smi_msg;
3607                 /* More retries, send again. */
3608
3609                 /* Start with the max timer, set to normal
3610                    timer after the message is sent. */
3611                 ent->timeout = MAX_MSG_TIMEOUT;
3612                 ent->retries_left--;
3613                 spin_lock(&intf->counter_lock);
3614                 if (ent->recv_msg->addr.addr_type == IPMI_LAN_ADDR_TYPE)
3615                         intf->retransmitted_lan_commands++;
3616                 else
3617                         intf->retransmitted_ipmb_commands++;
3618                 spin_unlock(&intf->counter_lock);
3619
3620                 smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot,
3621                                             ent->seqid);
3622                 if (!smi_msg)
3623                         return;
3624
3625                 spin_unlock_irqrestore(&intf->seq_lock, *flags);
3626
3627                 /* Send the new message.  We send with a zero
3628                  * priority.  It timed out, I doubt time is
3629                  * that critical now, and high priority
3630                  * messages are really only for messages to the
3631                  * local MC, which don't get resent. */
3632                 handlers = intf->handlers;
3633                 if (handlers)
3634                         intf->handlers->sender(intf->send_info,
3635                                                smi_msg, 0);
3636                 else
3637                         ipmi_free_smi_msg(smi_msg);
3638
3639                 spin_lock_irqsave(&intf->seq_lock, *flags);
3640         }
3641 }
3642
3643 static void ipmi_timeout_handler(long timeout_period)
3644 {
3645         ipmi_smi_t           intf;
3646         struct list_head     timeouts;
3647         struct ipmi_recv_msg *msg, *msg2;
3648         struct ipmi_smi_msg  *smi_msg, *smi_msg2;
3649         unsigned long        flags;
3650         int                  i;
3651
3652         rcu_read_lock();
3653         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
3654                 /* See if any waiting messages need to be processed. */
3655                 spin_lock_irqsave(&intf->waiting_msgs_lock, flags);
3656                 list_for_each_entry_safe(smi_msg, smi_msg2,
3657                                          &intf->waiting_msgs, link) {
3658                         if (!handle_new_recv_msg(intf, smi_msg)) {
3659                                 list_del(&smi_msg->link);
3660                                 ipmi_free_smi_msg(smi_msg);
3661                         } else {
3662                                 /* To preserve message order, quit if we
3663                                    can't handle a message. */
3664                                 break;
3665                         }
3666                 }
3667                 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags);
3668
3669                 /* Go through the seq table and find any messages that
3670                    have timed out, putting them in the timeouts
3671                    list. */
3672                 INIT_LIST_HEAD(&timeouts);
3673                 spin_lock_irqsave(&intf->seq_lock, flags);
3674                 for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
3675                         check_msg_timeout(intf, &(intf->seq_table[i]),
3676                                           &timeouts, timeout_period, i,
3677                                           &flags);
3678                 spin_unlock_irqrestore(&intf->seq_lock, flags);
3679
3680                 list_for_each_entry_safe(msg, msg2, &timeouts, link)
3681                         deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);
3682
3683                 /*
3684                  * Maintenance mode handling.  Check the timeout
3685                  * optimistically before we claim the lock.  It may
3686                  * mean a timeout gets missed occasionally, but that
3687                  * only means the timeout gets extended by one period
3688                  * in that case.  No big deal, and it avoids the lock
3689                  * most of the time.
3690                  */
3691                 if (intf->auto_maintenance_timeout > 0) {
3692                         spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
3693                         if (intf->auto_maintenance_timeout > 0) {
3694                                 intf->auto_maintenance_timeout
3695                                         -= timeout_period;
3696                                 if (!intf->maintenance_mode
3697                                     && (intf->auto_maintenance_timeout <= 0))
3698                                 {
3699                                         intf->maintenance_mode_enable = 0;
3700                                         maintenance_mode_update(intf);
3701                                 }
3702                         }
3703                         spin_unlock_irqrestore(&intf->maintenance_mode_lock,
3704                                                flags);
3705                 }
3706         }
3707         rcu_read_unlock();
3708 }
3709
3710 static void ipmi_request_event(void)
3711 {
3712         ipmi_smi_t               intf;
3713         struct ipmi_smi_handlers *handlers;
3714
3715         rcu_read_lock();
3716         /* Called from the timer, no need to check if handlers is
3717          * valid. */
3718         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
3719                 /* No event requests when in maintenance mode. */
3720                 if (intf->maintenance_mode_enable)
3721                         continue;
3722
3723                 handlers = intf->handlers;
3724                 if (handlers)
3725                         handlers->request_events(intf->send_info);
3726         }
3727         rcu_read_unlock();
3728 }
3729
3730 static struct timer_list ipmi_timer;
3731
3732 /* Call every ~100 ms. */
3733 #define IPMI_TIMEOUT_TIME       100
3734
3735 /* How many jiffies does it take to get to the timeout time. */
3736 #define IPMI_TIMEOUT_JIFFIES    ((IPMI_TIMEOUT_TIME * HZ) / 1000)
3737
3738 /* Request events from the queue every second (this is the number of
3739    IPMI_TIMEOUT_TIMES between event requests).  Hopefully, in the
3740    future, IPMI will add a way to know immediately if an event is in
3741    the queue and this silliness can go away. */
3742 #define IPMI_REQUEST_EV_TIME    (1000 / (IPMI_TIMEOUT_TIME))
3743
3744 static atomic_t stop_operation;
3745 static unsigned int ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
3746
3747 static void ipmi_timeout(unsigned long data)
3748 {
3749         if (atomic_read(&stop_operation))
3750                 return;
3751
3752         ticks_to_req_ev--;
3753         if (ticks_to_req_ev == 0) {
3754                 ipmi_request_event();
3755                 ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
3756         }
3757
3758         ipmi_timeout_handler(IPMI_TIMEOUT_TIME);
3759
3760         mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
3761 }
3762
3763
3764 static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
3765 static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
3766
3767 /* FIXME - convert these to slabs. */
3768 static void free_smi_msg(struct ipmi_smi_msg *msg)
3769 {
3770         atomic_dec(&smi_msg_inuse_count);
3771         kfree(msg);
3772 }
3773
3774 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void)
3775 {
3776         struct ipmi_smi_msg *rv;
3777         rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC);
3778         if (rv) {
3779                 rv->done = free_smi_msg;
3780                 rv->user_data = NULL;
3781                 atomic_inc(&smi_msg_inuse_count);
3782         }
3783         return rv;
3784 }
3785
3786 static void free_recv_msg(struct ipmi_recv_msg *msg)
3787 {
3788         atomic_dec(&recv_msg_inuse_count);
3789         kfree(msg);
3790 }
3791
3792 struct ipmi_recv_msg *ipmi_alloc_recv_msg(void)
3793 {
3794         struct ipmi_recv_msg *rv;
3795
3796         rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
3797         if (rv) {
3798                 rv->user = NULL;
3799                 rv->done = free_recv_msg;
3800                 atomic_inc(&recv_msg_inuse_count);
3801         }
3802         return rv;
3803 }
3804
3805 void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
3806 {
3807         if (msg->user)
3808                 kref_put(&msg->user->refcount, free_user);
3809         msg->done(msg);
3810 }
3811
3812 #ifdef CONFIG_IPMI_PANIC_EVENT
3813
3814 static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
3815 {
3816 }
3817
3818 static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
3819 {
3820 }
3821
3822 #ifdef CONFIG_IPMI_PANIC_STRING
3823 static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
3824 {
3825         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
3826             && (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE)
3827             && (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD)
3828             && (msg->msg.data[0] == IPMI_CC_NO_ERROR))
3829         {
3830                 /* A get event receiver command, save it. */
3831                 intf->event_receiver = msg->msg.data[1];
3832                 intf->event_receiver_lun = msg->msg.data[2] & 0x3;
3833         }
3834 }
3835
3836 static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
3837 {
3838         if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
3839             && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
3840             && (msg->msg.cmd == IPMI_GET_DEVICE_ID_CMD)
3841             && (msg->msg.data[0] == IPMI_CC_NO_ERROR))
3842         {
3843                 /* A get device id command, save if we are an event
3844                    receiver or generator. */
3845                 intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
3846                 intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
3847         }
3848 }
3849 #endif
3850
3851 static void send_panic_events(char *str)
3852 {
3853         struct kernel_ipmi_msg            msg;
3854         ipmi_smi_t                        intf;
3855         unsigned char                     data[16];
3856         struct ipmi_system_interface_addr *si;
3857         struct ipmi_addr                  addr;
3858         struct ipmi_smi_msg               smi_msg;
3859         struct ipmi_recv_msg              recv_msg;
3860
3861         si = (struct ipmi_system_interface_addr *) &addr;
3862         si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3863         si->channel = IPMI_BMC_CHANNEL;
3864         si->lun = 0;
3865
3866         /* Fill in an event telling that we have failed. */
3867         msg.netfn = 0x04; /* Sensor or Event. */
3868         msg.cmd = 2; /* Platform event command. */
3869         msg.data = data;
3870         msg.data_len = 8;
3871         data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */
3872         data[1] = 0x03; /* This is for IPMI 1.0. */
3873         data[2] = 0x20; /* OS Critical Stop, IPMI table 36-3 */
3874         data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */
3875         data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */
3876
3877         /* Put a few breadcrumbs in.  Hopefully later we can add more things
3878            to make the panic events more useful. */
3879         if (str) {
3880                 data[3] = str[0];
3881                 data[6] = str[1];
3882                 data[7] = str[2];
3883         }
3884
3885         smi_msg.done = dummy_smi_done_handler;
3886         recv_msg.done = dummy_recv_done_handler;
3887
3888         /* For every registered interface, send the event. */
3889         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
3890                 if (!intf->handlers)
3891                         /* Interface is not ready. */
3892                         continue;
3893
3894                 /* Send the event announcing the panic. */
3895                 intf->handlers->set_run_to_completion(intf->send_info, 1);
3896                 i_ipmi_request(NULL,
3897                                intf,
3898                                &addr,
3899                                0,
3900                                &msg,
3901                                intf,
3902                                &smi_msg,
3903                                &recv_msg,
3904                                0,
3905                                intf->channels[0].address,
3906                                intf->channels[0].lun,
3907                                0, 1); /* Don't retry, and don't wait. */
3908         }
3909
3910 #ifdef CONFIG_IPMI_PANIC_STRING
3911         /* On every interface, dump a bunch of OEM event holding the
3912            string. */
3913         if (!str)
3914                 return;
3915
3916         /* For every registered interface, send the event. */
3917         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
3918                 char                  *p = str;
3919                 struct ipmi_ipmb_addr *ipmb;
3920                 int                   j;
3921
3922                 if (intf->intf_num == -1)
3923                         /* Interface was not ready yet. */
3924                         continue;
3925
3926                 /* First job here is to figure out where to send the
3927                    OEM events.  There's no way in IPMI to send OEM
3928                    events using an event send command, so we have to
3929                    find the SEL to put them in and stick them in
3930                    there. */
3931
3932                 /* Get capabilities from the get device id. */
3933                 intf->local_sel_device = 0;
3934                 intf->local_event_generator = 0;
3935                 intf->event_receiver = 0;
3936
3937                 /* Request the device info from the local MC. */
3938                 msg.netfn = IPMI_NETFN_APP_REQUEST;
3939                 msg.cmd = IPMI_GET_DEVICE_ID_CMD;
3940                 msg.data = NULL;
3941                 msg.data_len = 0;
3942                 intf->null_user_handler = device_id_fetcher;
3943                 i_ipmi_request(NULL,
3944                                intf,
3945                                &addr,
3946                                0,
3947                                &msg,
3948                                intf,
3949                                &smi_msg,
3950                                &recv_msg,
3951                                0,
3952                                intf->channels[0].address,
3953                                intf->channels[0].lun,
3954                                0, 1); /* Don't retry, and don't wait. */
3955
3956                 if (intf->local_event_generator) {
3957                         /* Request the event receiver from the local MC. */
3958                         msg.netfn = IPMI_NETFN_SENSOR_EVENT_REQUEST;
3959                         msg.cmd = IPMI_GET_EVENT_RECEIVER_CMD;
3960                         msg.data = NULL;
3961                         msg.data_len = 0;
3962                         intf->null_user_handler = event_receiver_fetcher;
3963                         i_ipmi_request(NULL,
3964                                        intf,
3965                                        &addr,
3966                                        0,
3967                                        &msg,
3968                                        intf,
3969                                        &smi_msg,
3970                                        &recv_msg,
3971                                        0,
3972                                        intf->channels[0].address,
3973                                        intf->channels[0].lun,
3974                                        0, 1); /* no retry, and no wait. */
3975                 }
3976                 intf->null_user_handler = NULL;
3977
3978                 /* Validate the event receiver.  The low bit must not
3979                    be 1 (it must be a valid IPMB address), it cannot
3980                    be zero, and it must not be my address. */
3981                 if (((intf->event_receiver & 1) == 0)
3982                     && (intf->event_receiver != 0)
3983                     && (intf->event_receiver != intf->channels[0].address))
3984                 {
3985                         /* The event receiver is valid, send an IPMB
3986                            message. */
3987                         ipmb = (struct ipmi_ipmb_addr *) &addr;
3988                         ipmb->addr_type = IPMI_IPMB_ADDR_TYPE;
3989                         ipmb->channel = 0; /* FIXME - is this right? */
3990                         ipmb->lun = intf->event_receiver_lun;
3991                         ipmb->slave_addr = intf->event_receiver;
3992                 } else if (intf->local_sel_device) {
3993                         /* The event receiver was not valid (or was
3994                            me), but I am an SEL device, just dump it
3995                            in my SEL. */
3996                         si = (struct ipmi_system_interface_addr *) &addr;
3997                         si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
3998                         si->channel = IPMI_BMC_CHANNEL;
3999                         si->lun = 0;
4000                 } else
4001                         continue; /* No where to send the event. */
4002
4003
4004                 msg.netfn = IPMI_NETFN_STORAGE_REQUEST; /* Storage. */
4005                 msg.cmd = IPMI_ADD_SEL_ENTRY_CMD;
4006                 msg.data = data;
4007                 msg.data_len = 16;
4008
4009                 j = 0;
4010                 while (*p) {
4011                         int size = strlen(p);
4012
4013                         if (size > 11)
4014                                 size = 11;
4015                         data[0] = 0;
4016                         data[1] = 0;
4017                         data[2] = 0xf0; /* OEM event without timestamp. */
4018                         data[3] = intf->channels[0].address;
4019                         data[4] = j++; /* sequence # */
4020                         /* Always give 11 bytes, so strncpy will fill
4021                            it with zeroes for me. */
4022                         strncpy(data+5, p, 11);
4023                         p += size;
4024
4025                         i_ipmi_request(NULL,
4026                                        intf,
4027                                        &addr,
4028                                        0,
4029                                        &msg,
4030                                        intf,
4031                                        &smi_msg,
4032                                        &recv_msg,
4033                                        0,
4034                                        intf->channels[0].address,
4035                                        intf->channels[0].lun,
4036                                        0, 1); /* no retry, and no wait. */
4037                 }
4038         }
4039 #endif /* CONFIG_IPMI_PANIC_STRING */
4040 }
4041 #endif /* CONFIG_IPMI_PANIC_EVENT */
4042
4043 static int has_panicked;
4044
4045 static int panic_event(struct notifier_block *this,
4046                        unsigned long         event,
4047                        void                  *ptr)
4048 {
4049         ipmi_smi_t intf;
4050
4051         if (has_panicked)
4052                 return NOTIFY_DONE;
4053         has_panicked = 1;
4054
4055         /* For every registered interface, set it to run to completion. */
4056         list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4057                 if (!intf->handlers)
4058                         /* Interface is not ready. */
4059                         continue;
4060
4061                 intf->handlers->set_run_to_completion(intf->send_info, 1);
4062         }
4063
4064 #ifdef CONFIG_IPMI_PANIC_EVENT
4065         send_panic_events(ptr);
4066 #endif
4067
4068         return NOTIFY_DONE;
4069 }
4070
4071 static struct notifier_block panic_block = {
4072         .notifier_call  = panic_event,
4073         .next           = NULL,
4074         .priority       = 200   /* priority: INT_MAX >= x >= 0 */
4075 };
4076
4077 static int ipmi_init_msghandler(void)
4078 {
4079         int rv;
4080
4081         if (initialized)
4082                 return 0;
4083
4084         rv = driver_register(&ipmidriver);
4085         if (rv) {
4086                 printk(KERN_ERR PFX "Could not register IPMI driver\n");
4087                 return rv;
4088         }
4089
4090         printk(KERN_INFO "ipmi message handler version "
4091                IPMI_DRIVER_VERSION "\n");
4092
4093 #ifdef CONFIG_PROC_FS
4094         proc_ipmi_root = proc_mkdir("ipmi", NULL);
4095         if (!proc_ipmi_root) {
4096             printk(KERN_ERR PFX "Unable to create IPMI proc dir");
4097             return -ENOMEM;
4098         }
4099
4100         proc_ipmi_root->owner = THIS_MODULE;
4101 #endif /* CONFIG_PROC_FS */
4102
4103         setup_timer(&ipmi_timer, ipmi_timeout, 0);
4104         mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
4105
4106         atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
4107
4108         initialized = 1;
4109
4110         return 0;
4111 }
4112
4113 static __init int ipmi_init_msghandler_mod(void)
4114 {
4115         ipmi_init_msghandler();
4116         return 0;
4117 }
4118
4119 static __exit void cleanup_ipmi(void)
4120 {
4121         int count;
4122
4123         if (!initialized)
4124                 return;
4125
4126         atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block);
4127
4128         /* This can't be called if any interfaces exist, so no worry about
4129            shutting down the interfaces. */
4130
4131         /* Tell the timer to stop, then wait for it to stop.  This avoids
4132            problems with race conditions removing the timer here. */
4133         atomic_inc(&stop_operation);
4134         del_timer_sync(&ipmi_timer);
4135
4136 #ifdef CONFIG_PROC_FS
4137         remove_proc_entry(proc_ipmi_root->name, &proc_root);
4138 #endif /* CONFIG_PROC_FS */
4139
4140         driver_unregister(&ipmidriver);
4141
4142         initialized = 0;
4143
4144         /* Check for buffer leaks. */
4145         count = atomic_read(&smi_msg_inuse_count);
4146         if (count != 0)
4147                 printk(KERN_WARNING PFX "SMI message count %d at exit\n",
4148                        count);
4149         count = atomic_read(&recv_msg_inuse_count);
4150         if (count != 0)
4151                 printk(KERN_WARNING PFX "recv message count %d at exit\n",
4152                        count);
4153 }
4154 module_exit(cleanup_ipmi);
4155
4156 module_init(ipmi_init_msghandler_mod);
4157 MODULE_LICENSE("GPL");
4158 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
4159 MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI interface.");
4160 MODULE_VERSION(IPMI_DRIVER_VERSION);
4161
4162 EXPORT_SYMBOL(ipmi_create_user);
4163 EXPORT_SYMBOL(ipmi_destroy_user);
4164 EXPORT_SYMBOL(ipmi_get_version);
4165 EXPORT_SYMBOL(ipmi_request_settime);
4166 EXPORT_SYMBOL(ipmi_request_supply_msgs);
4167 EXPORT_SYMBOL(ipmi_register_smi);
4168 EXPORT_SYMBOL(ipmi_unregister_smi);
4169 EXPORT_SYMBOL(ipmi_register_for_cmd);
4170 EXPORT_SYMBOL(ipmi_unregister_for_cmd);
4171 EXPORT_SYMBOL(ipmi_smi_msg_received);
4172 EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout);
4173 EXPORT_SYMBOL(ipmi_alloc_smi_msg);
4174 EXPORT_SYMBOL(ipmi_addr_length);
4175 EXPORT_SYMBOL(ipmi_validate_addr);
4176 EXPORT_SYMBOL(ipmi_set_gets_events);
4177 EXPORT_SYMBOL(ipmi_smi_watcher_register);
4178 EXPORT_SYMBOL(ipmi_smi_watcher_unregister);
4179 EXPORT_SYMBOL(ipmi_set_my_address);
4180 EXPORT_SYMBOL(ipmi_get_my_address);
4181 EXPORT_SYMBOL(ipmi_set_my_LUN);
4182 EXPORT_SYMBOL(ipmi_get_my_LUN);
4183 EXPORT_SYMBOL(ipmi_smi_add_proc_entry);
4184 EXPORT_SYMBOL(ipmi_user_set_run_to_completion);
4185 EXPORT_SYMBOL(ipmi_free_recv_msg);