kernel/drivers/char/ipmi/ipmi_devintf.c

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