release/src-rt-6.x.4708/linux/linux-2.6.36/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 <asm/system.h>
  38 #include <linux/poll.h>
  39 #include <linux/sched.h>
  40 #include <linux/spinlock.h>
  41 #include <linux/slab.h>
  42 #include <linux/ipmi.h>
  43 #include <linux/mutex.h>
  44 #include <linux/init.h>
  45 #include <linux/device.h>
  46 #include <linux/compat.h>
  47 #include <linux/smp_lock.h>
  48
  49 struct ipmi_file_private
  50 {
  51         ipmi_user_t          user;
  52         spinlock_t           recv_msg_lock;
  53         struct list_head     recv_msgs;
  54         struct file          *file;
  55         struct fasync_struct *fasync_queue;
  56         wait_queue_head_t    wait;
  57         struct mutex         recv_mutex;
  58         int                  default_retries;
  59         unsigned int         default_retry_time_ms;
  60 };
  61
  62 static void file_receive_handler(struct ipmi_recv_msg *msg,
  63                                  void                 *handler_data)
  64 {
  65         struct ipmi_file_private *priv = handler_data;
  66         int                      was_empty;
  67         unsigned long            flags;
  68
  69         spin_lock_irqsave(&(priv->recv_msg_lock), flags);
  70
  71         was_empty = list_empty(&(priv->recv_msgs));
  72         list_add_tail(&(msg->link), &(priv->recv_msgs));
  73
  74         if (was_empty) {
  75                 wake_up_interruptible(&priv->wait);
  76                 kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
  77         }
  78
  79         spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
  80 }
  81
  82 static unsigned int ipmi_poll(struct file *file, poll_table *wait)
  83 {
  84         struct ipmi_file_private *priv = file->private_data;
  85         unsigned int             mask = 0;
  86         unsigned long            flags;
  87
  88         poll_wait(file, &priv->wait, wait);
  89
  90         spin_lock_irqsave(&priv->recv_msg_lock, flags);
  91
  92         if (!list_empty(&(priv->recv_msgs)))
  93                 mask |= (POLLIN | POLLRDNORM);
  94
  95         spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
  96
  97         return mask;
  98 }
  99
 100 static int ipmi_fasync(int fd, struct file *file, int on)
 101 {
 102         struct ipmi_file_private *priv = file->private_data;
 103         int                      result;
 104
 105         lock_kernel(); /* could race against open() otherwise */
 106         result = fasync_helper(fd, file, on, &priv->fasync_queue);
 107         unlock_kernel();
 108
 109         return (result);
 110 }
 111
 112 static struct ipmi_user_hndl ipmi_hndlrs =
 113 {
 114         .ipmi_recv_hndl = file_receive_handler,
 115 };
 116
 117 static int ipmi_open(struct inode *inode, struct file *file)
 118 {
 119         int                      if_num = iminor(inode);
 120         int                      rv;
 121         struct ipmi_file_private *priv;
 122
 123
 124         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 125         if (!priv)
 126                 return -ENOMEM;
 127
 128         lock_kernel();
 129         priv->file = file;
 130
 131         rv = ipmi_create_user(if_num,
 132                               &ipmi_hndlrs,
 133                               priv,
 134                               &(priv->user));
 135         if (rv) {
 136                 kfree(priv);
 137                 goto out;
 138         }
 139
 140         file->private_data = priv;
 141
 142         spin_lock_init(&(priv->recv_msg_lock));
 143         INIT_LIST_HEAD(&(priv->recv_msgs));
 144         init_waitqueue_head(&priv->wait);
 145         priv->fasync_queue = NULL;
 146         mutex_init(&priv->recv_mutex);
 147
 148         /* Use the low-level defaults. */
 149         priv->default_retries = -1;
 150         priv->default_retry_time_ms = 0;
 151
 152 out:
 153         unlock_kernel();
 154         return rv;
 155 }
 156
 157 static int ipmi_release(struct inode *inode, struct file *file)
 158 {
 159         struct ipmi_file_private *priv = file->private_data;
 160         int                      rv;
 161
 162         rv = ipmi_destroy_user(priv->user);
 163         if (rv)
 164                 return rv;
 165
 166         kfree(priv);
 167
 168         return 0;
 169 }
 170
 171 static int handle_send_req(ipmi_user_t     user,
 172                            struct ipmi_req *req,
 173                            int             retries,
 174                            unsigned int    retry_time_ms)
 175 {
 176         int              rv;
 177         struct ipmi_addr addr;
 178         struct kernel_ipmi_msg msg;
 179
 180         if (req->addr_len > sizeof(struct ipmi_addr))
 181                 return -EINVAL;
 182
 183         if (copy_from_user(&addr, req->addr, req->addr_len))
 184                 return -EFAULT;
 185
 186         msg.netfn = req->msg.netfn;
 187         msg.cmd = req->msg.cmd;
 188         msg.data_len = req->msg.data_len;
 189         msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
 190         if (!msg.data)
 191                 return -ENOMEM;
 192
 193         /* From here out we cannot return, we must jump to "out" for
 194            error exits to free msgdata. */
 195
 196         rv = ipmi_validate_addr(&addr, req->addr_len);
 197         if (rv)
 198                 goto out;
 199
 200         if (req->msg.data != NULL) {
 201                 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
 202                         rv = -EMSGSIZE;
 203                         goto out;
 204                 }
 205
 206                 if (copy_from_user(msg.data,
 207                                    req->msg.data,
 208                                    req->msg.data_len))
 209                 {
 210                         rv = -EFAULT;
 211                         goto out;
 212                 }
 213         } else {
 214                 msg.data_len = 0;
 215         }
 216
 217         rv = ipmi_request_settime(user,
 218                                   &addr,
 219                                   req->msgid,
 220                                   &msg,
 221                                   NULL,
 222                                   0,
 223                                   retries,
 224                                   retry_time_ms);
 225  out:
 226         kfree(msg.data);
 227         return rv;
 228 }
 229
 230 static int ipmi_ioctl(struct file   *file,
 231                       unsigned int  cmd,
 232                       unsigned long data)
 233 {
 234         int                      rv = -EINVAL;
 235         struct ipmi_file_private *priv = file->private_data;
 236         void __user *arg = (void __user *)data;
 237
 238         switch (cmd)
 239         {
 240         case IPMICTL_SEND_COMMAND:
 241         {
 242                 struct ipmi_req req;
 243
 244                 if (copy_from_user(&req, arg, sizeof(req))) {
 245                         rv = -EFAULT;
 246                         break;
 247                 }
 248
 249                 rv = handle_send_req(priv->user,
 250                                      &req,
 251                                      priv->default_retries,
 252                                      priv->default_retry_time_ms);
 253                 break;
 254         }
 255
 256         case IPMICTL_SEND_COMMAND_SETTIME:
 257         {
 258                 struct ipmi_req_settime req;
 259
 260                 if (copy_from_user(&req, arg, sizeof(req))) {
 261                         rv = -EFAULT;
 262                         break;
 263                 }
 264
 265                 rv = handle_send_req(priv->user,
 266                                      &req.req,
 267                                      req.retries,
 268                                      req.retry_time_ms);
 269                 break;
 270         }
 271
 272         case IPMICTL_RECEIVE_MSG:
 273         case IPMICTL_RECEIVE_MSG_TRUNC:
 274         {
 275                 struct ipmi_recv      rsp;
 276                 int              addr_len;
 277                 struct list_head *entry;
 278                 struct ipmi_recv_msg  *msg;
 279                 unsigned long    flags;
 280
 281
 282                 rv = 0;
 283                 if (copy_from_user(&rsp, arg, sizeof(rsp))) {
 284                         rv = -EFAULT;
 285                         break;
 286                 }
 287
 288                 /* We claim a mutex because we don't want two
 289                    users getting something from the queue at a time.
 290                    Since we have to release the spinlock before we can
 291                    copy the data to the user, it's possible another
 292                    user will grab something from the queue, too.  Then
 293                    the messages might get out of order if something
 294                    fails and the message gets put back onto the
 295                    queue.  This mutex prevents that problem. */
 296                 mutex_lock(&priv->recv_mutex);
 297
 298                 /* Grab the message off the list. */
 299                 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
 300                 if (list_empty(&(priv->recv_msgs))) {
 301                         spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 302                         rv = -EAGAIN;
 303                         goto recv_err;
 304                 }
 305                 entry = priv->recv_msgs.next;
 306                 msg = list_entry(entry, struct ipmi_recv_msg, link);
 307                 list_del(entry);
 308                 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 309
 310                 addr_len = ipmi_addr_length(msg->addr.addr_type);
 311                 if (rsp.addr_len < addr_len)
 312                 {
 313                         rv = -EINVAL;
 314                         goto recv_putback_on_err;
 315                 }
 316
 317                 if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) {
 318                         rv = -EFAULT;
 319                         goto recv_putback_on_err;
 320                 }
 321                 rsp.addr_len = addr_len;
 322
 323                 rsp.recv_type = msg->recv_type;
 324                 rsp.msgid = msg->msgid;
 325                 rsp.msg.netfn = msg->msg.netfn;
 326                 rsp.msg.cmd = msg->msg.cmd;
 327
 328                 if (msg->msg.data_len > 0) {
 329                         if (rsp.msg.data_len < msg->msg.data_len) {
 330                                 rv = -EMSGSIZE;
 331                                 if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) {
 332                                         msg->msg.data_len = rsp.msg.data_len;
 333                                 } else {
 334                                         goto recv_putback_on_err;
 335                                 }
 336                         }
 337
 338                         if (copy_to_user(rsp.msg.data,
 339                                          msg->msg.data,
 340                                          msg->msg.data_len))
 341                         {
 342                                 rv = -EFAULT;
 343                                 goto recv_putback_on_err;
 344                         }
 345                         rsp.msg.data_len = msg->msg.data_len;
 346                 } else {
 347                         rsp.msg.data_len = 0;
 348                 }
 349
 350                 if (copy_to_user(arg, &rsp, sizeof(rsp))) {
 351                         rv = -EFAULT;
 352                         goto recv_putback_on_err;
 353                 }
 354
 355                 mutex_unlock(&priv->recv_mutex);
 356                 ipmi_free_recv_msg(msg);
 357                 break;
 358
 359         recv_putback_on_err:
 360                 /* If we got an error, put the message back onto
 361                    the head of the queue. */
 362                 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
 363                 list_add(entry, &(priv->recv_msgs));
 364                 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 365                 mutex_unlock(&priv->recv_mutex);
 366                 break;
 367
 368         recv_err:
 369                 mutex_unlock(&priv->recv_mutex);
 370                 break;
 371         }
 372
 373         case IPMICTL_REGISTER_FOR_CMD:
 374         {
 375                 struct ipmi_cmdspec val;
 376
 377                 if (copy_from_user(&val, arg, sizeof(val))) {
 378                         rv = -EFAULT;
 379                         break;
 380                 }
 381
 382                 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
 383                                            IPMI_CHAN_ALL);
 384                 break;
 385         }
 386
 387         case IPMICTL_UNREGISTER_FOR_CMD:
 388         {
 389                 struct ipmi_cmdspec   val;
 390
 391                 if (copy_from_user(&val, arg, sizeof(val))) {
 392                         rv = -EFAULT;
 393                         break;
 394                 }
 395
 396                 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
 397                                              IPMI_CHAN_ALL);
 398                 break;
 399         }
 400
 401         case IPMICTL_REGISTER_FOR_CMD_CHANS:
 402         {
 403                 struct ipmi_cmdspec_chans val;
 404
 405                 if (copy_from_user(&val, arg, sizeof(val))) {
 406                         rv = -EFAULT;
 407                         break;
 408                 }
 409
 410                 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
 411                                            val.chans);
 412                 break;
 413         }
 414
 415         case IPMICTL_UNREGISTER_FOR_CMD_CHANS:
 416         {
 417                 struct ipmi_cmdspec_chans val;
 418
 419                 if (copy_from_user(&val, arg, sizeof(val))) {
 420                         rv = -EFAULT;
 421                         break;
 422                 }
 423
 424                 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
 425                                              val.chans);
 426                 break;
 427         }
 428
 429         case IPMICTL_SET_GETS_EVENTS_CMD:
 430         {
 431                 int val;
 432
 433                 if (copy_from_user(&val, arg, sizeof(val))) {
 434                         rv = -EFAULT;
 435                         break;
 436                 }
 437
 438                 rv = ipmi_set_gets_events(priv->user, val);
 439                 break;
 440         }
 441
 442         /* The next four are legacy, not per-channel. */
 443         case IPMICTL_SET_MY_ADDRESS_CMD:
 444         {
 445                 unsigned int val;
 446
 447                 if (copy_from_user(&val, arg, sizeof(val))) {
 448                         rv = -EFAULT;
 449                         break;
 450                 }
 451
 452                 rv = ipmi_set_my_address(priv->user, 0, val);
 453                 break;
 454         }
 455
 456         case IPMICTL_GET_MY_ADDRESS_CMD:
 457         {
 458                 unsigned int  val;
 459                 unsigned char rval;
 460
 461                 rv = ipmi_get_my_address(priv->user, 0, &rval);
 462                 if (rv)
 463                         break;
 464
 465                 val = rval;
 466
 467                 if (copy_to_user(arg, &val, sizeof(val))) {
 468                         rv = -EFAULT;
 469                         break;
 470                 }
 471                 break;
 472         }
 473
 474         case IPMICTL_SET_MY_LUN_CMD:
 475         {
 476                 unsigned int val;
 477
 478                 if (copy_from_user(&val, arg, sizeof(val))) {
 479                         rv = -EFAULT;
 480                         break;
 481                 }
 482
 483                 rv = ipmi_set_my_LUN(priv->user, 0, val);
 484                 break;
 485         }
 486
 487         case IPMICTL_GET_MY_LUN_CMD:
 488         {
 489                 unsigned int  val;
 490                 unsigned char rval;
 491
 492                 rv = ipmi_get_my_LUN(priv->user, 0, &rval);
 493                 if (rv)
 494                         break;
 495
 496                 val = rval;
 497
 498                 if (copy_to_user(arg, &val, sizeof(val))) {
 499                         rv = -EFAULT;
 500                         break;
 501                 }
 502                 break;
 503         }
 504
 505         case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
 506         {
 507                 struct ipmi_channel_lun_address_set val;
 508
 509                 if (copy_from_user(&val, arg, sizeof(val))) {
 510                         rv = -EFAULT;
 511                         break;
 512                 }
 513
 514                 return ipmi_set_my_address(priv->user, val.channel, val.value);
 515                 break;
 516         }
 517
 518         case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
 519         {
 520                 struct ipmi_channel_lun_address_set val;
 521
 522                 if (copy_from_user(&val, arg, sizeof(val))) {
 523                         rv = -EFAULT;
 524                         break;
 525                 }
 526
 527                 rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
 528                 if (rv)
 529                         break;
 530
 531                 if (copy_to_user(arg, &val, sizeof(val))) {
 532                         rv = -EFAULT;
 533                         break;
 534                 }
 535                 break;
 536         }
 537
 538         case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
 539         {
 540                 struct ipmi_channel_lun_address_set val;
 541
 542                 if (copy_from_user(&val, arg, sizeof(val))) {
 543                         rv = -EFAULT;
 544                         break;
 545                 }
 546
 547                 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
 548                 break;
 549         }
 550
 551         case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
 552         {
 553                 struct ipmi_channel_lun_address_set val;
 554
 555                 if (copy_from_user(&val, arg, sizeof(val))) {
 556                         rv = -EFAULT;
 557                         break;
 558                 }
 559
 560                 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
 561                 if (rv)
 562                         break;
 563
 564                 if (copy_to_user(arg, &val, sizeof(val))) {
 565                         rv = -EFAULT;
 566                         break;
 567                 }
 568                 break;
 569         }
 570
 571         case IPMICTL_SET_TIMING_PARMS_CMD:
 572         {
 573                 struct ipmi_timing_parms parms;
 574
 575                 if (copy_from_user(&parms, arg, sizeof(parms))) {
 576                         rv = -EFAULT;
 577                         break;
 578                 }
 579
 580                 priv->default_retries = parms.retries;
 581                 priv->default_retry_time_ms = parms.retry_time_ms;
 582                 rv = 0;
 583                 break;
 584         }
 585
 586         case IPMICTL_GET_TIMING_PARMS_CMD:
 587         {
 588                 struct ipmi_timing_parms parms;
 589
 590                 parms.retries = priv->default_retries;
 591                 parms.retry_time_ms = priv->default_retry_time_ms;
 592
 593                 if (copy_to_user(arg, &parms, sizeof(parms))) {
 594                         rv = -EFAULT;
 595                         break;
 596                 }
 597
 598                 rv = 0;
 599                 break;
 600         }
 601
 602         case IPMICTL_GET_MAINTENANCE_MODE_CMD:
 603         {
 604                 int mode;
 605
 606                 mode = ipmi_get_maintenance_mode(priv->user);
 607                 if (copy_to_user(arg, &mode, sizeof(mode))) {
 608                         rv = -EFAULT;
 609                         break;
 610                 }
 611                 rv = 0;
 612                 break;
 613         }
 614
 615         case IPMICTL_SET_MAINTENANCE_MODE_CMD:
 616         {
 617                 int mode;
 618
 619                 if (copy_from_user(&mode, arg, sizeof(mode))) {
 620                         rv = -EFAULT;
 621                         break;
 622                 }
 623                 rv = ipmi_set_maintenance_mode(priv->user, mode);
 624                 break;
 625         }
 626         }
 627
 628         return rv;
 629 }
 630
 631 /*
 632  * Note: it doesn't make sense to take the BKL here but
 633  *       not in compat_ipmi_ioctl. -arnd
 634  */
 635 static long ipmi_unlocked_ioctl(struct file   *file,
 636                                 unsigned int  cmd,
 637                                 unsigned long data)
 638 {
 639         int ret;
 640
 641         lock_kernel();
 642         ret = ipmi_ioctl(file, cmd, data);
 643         unlock_kernel();
 644
 645         return ret;
 646 }
 647
 648 #ifdef CONFIG_COMPAT
 649
 650 /*
 651  * The following code contains code for supporting 32-bit compatible
 652  * ioctls on 64-bit kernels.  This allows running 32-bit apps on the
 653  * 64-bit kernel
 654  */
 655 #define COMPAT_IPMICTL_SEND_COMMAND     \
 656         _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req)
 657 #define COMPAT_IPMICTL_SEND_COMMAND_SETTIME     \
 658         _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime)
 659 #define COMPAT_IPMICTL_RECEIVE_MSG      \
 660         _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv)
 661 #define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC        \
 662         _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv)
 663
 664 struct compat_ipmi_msg {
 665         u8              netfn;
 666         u8              cmd;
 667         u16             data_len;
 668         compat_uptr_t   data;
 669 };
 670
 671 struct compat_ipmi_req {
 672         compat_uptr_t           addr;
 673         compat_uint_t           addr_len;
 674         compat_long_t           msgid;
 675         struct compat_ipmi_msg  msg;
 676 };
 677
 678 struct compat_ipmi_recv {
 679         compat_int_t            recv_type;
 680         compat_uptr_t           addr;
 681         compat_uint_t           addr_len;
 682         compat_long_t           msgid;
 683         struct compat_ipmi_msg  msg;
 684 };
 685
 686 struct compat_ipmi_req_settime {
 687         struct compat_ipmi_req  req;
 688         compat_int_t            retries;
 689         compat_uint_t           retry_time_ms;
 690 };
 691
 692 /*
 693  * Define some helper functions for copying IPMI data
 694  */
 695 static long get_compat_ipmi_msg(struct ipmi_msg *p64,
 696                                 struct compat_ipmi_msg __user *p32)
 697 {
 698         compat_uptr_t tmp;
 699
 700         if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
 701                         __get_user(p64->netfn, &p32->netfn) ||
 702                         __get_user(p64->cmd, &p32->cmd) ||
 703                         __get_user(p64->data_len, &p32->data_len) ||
 704                         __get_user(tmp, &p32->data))
 705                 return -EFAULT;
 706         p64->data = compat_ptr(tmp);
 707         return 0;
 708 }
 709
 710 static long put_compat_ipmi_msg(struct ipmi_msg *p64,
 711                                 struct compat_ipmi_msg __user *p32)
 712 {
 713         if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
 714                         __put_user(p64->netfn, &p32->netfn) ||
 715                         __put_user(p64->cmd, &p32->cmd) ||
 716                         __put_user(p64->data_len, &p32->data_len))
 717                 return -EFAULT;
 718         return 0;
 719 }
 720
 721 static long get_compat_ipmi_req(struct ipmi_req *p64,
 722                                 struct compat_ipmi_req __user *p32)
 723 {
 724
 725         compat_uptr_t   tmp;
 726
 727         if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
 728                         __get_user(tmp, &p32->addr) ||
 729                         __get_user(p64->addr_len, &p32->addr_len) ||
 730                         __get_user(p64->msgid, &p32->msgid) ||
 731                         get_compat_ipmi_msg(&p64->msg, &p32->msg))
 732                 return -EFAULT;
 733         p64->addr = compat_ptr(tmp);
 734         return 0;
 735 }
 736
 737 static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64,
 738                 struct compat_ipmi_req_settime __user *p32)
 739 {
 740         if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
 741                         get_compat_ipmi_req(&p64->req, &p32->req) ||
 742                         __get_user(p64->retries, &p32->retries) ||
 743                         __get_user(p64->retry_time_ms, &p32->retry_time_ms))
 744                 return -EFAULT;
 745         return 0;
 746 }
 747
 748 static long get_compat_ipmi_recv(struct ipmi_recv *p64,
 749                                  struct compat_ipmi_recv __user *p32)
 750 {
 751         compat_uptr_t tmp;
 752
 753         if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
 754                         __get_user(p64->recv_type, &p32->recv_type) ||
 755                         __get_user(tmp, &p32->addr) ||
 756                         __get_user(p64->addr_len, &p32->addr_len) ||
 757                         __get_user(p64->msgid, &p32->msgid) ||
 758                         get_compat_ipmi_msg(&p64->msg, &p32->msg))
 759                 return -EFAULT;
 760         p64->addr = compat_ptr(tmp);
 761         return 0;
 762 }
 763
 764 static long put_compat_ipmi_recv(struct ipmi_recv *p64,
 765                                  struct compat_ipmi_recv __user *p32)
 766 {
 767         if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
 768                         __put_user(p64->recv_type, &p32->recv_type) ||
 769                         __put_user(p64->addr_len, &p32->addr_len) ||
 770                         __put_user(p64->msgid, &p32->msgid) ||
 771                         put_compat_ipmi_msg(&p64->msg, &p32->msg))
 772                 return -EFAULT;
 773         return 0;
 774 }
 775
 776 /*
 777  * Handle compatibility ioctls
 778  */
 779 static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
 780                               unsigned long arg)
 781 {
 782         int rc;
 783         struct ipmi_file_private *priv = filep->private_data;
 784
 785         switch(cmd) {
 786         case COMPAT_IPMICTL_SEND_COMMAND:
 787         {
 788                 struct ipmi_req rp;
 789
 790                 if (get_compat_ipmi_req(&rp, compat_ptr(arg)))
 791                         return -EFAULT;
 792
 793                 return handle_send_req(priv->user, &rp,
 794                                 priv->default_retries,
 795                                 priv->default_retry_time_ms);
 796         }
 797         case COMPAT_IPMICTL_SEND_COMMAND_SETTIME:
 798         {
 799                 struct ipmi_req_settime sp;
 800
 801                 if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg)))
 802                         return -EFAULT;
 803
 804                 return handle_send_req(priv->user, &sp.req,
 805                                 sp.retries, sp.retry_time_ms);
 806         }
 807         case COMPAT_IPMICTL_RECEIVE_MSG:
 808         case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC:
 809         {
 810                 struct ipmi_recv   __user *precv64;
 811                 struct ipmi_recv   recv64;
 812
 813                 if (get_compat_ipmi_recv(&recv64, compat_ptr(arg)))
 814                         return -EFAULT;
 815
 816                 precv64 = compat_alloc_user_space(sizeof(recv64));
 817                 if (copy_to_user(precv64, &recv64, sizeof(recv64)))
 818                         return -EFAULT;
 819
 820                 rc = ipmi_ioctl(filep,
 821                                 ((cmd == COMPAT_IPMICTL_RECEIVE_MSG)
 822                                  ? IPMICTL_RECEIVE_MSG
 823                                  : IPMICTL_RECEIVE_MSG_TRUNC),
 824                                 (unsigned long) precv64);
 825                 if (rc != 0)
 826                         return rc;
 827
 828                 if (copy_from_user(&recv64, precv64, sizeof(recv64)))
 829                         return -EFAULT;
 830
 831                 if (put_compat_ipmi_recv(&recv64, compat_ptr(arg)))
 832                         return -EFAULT;
 833
 834                 return rc;
 835         }
 836         default:
 837                 return ipmi_ioctl(filep, cmd, arg);
 838         }
 839 }
 840 #endif
 841
 842 static const struct file_operations ipmi_fops = {
 843         .owner          = THIS_MODULE,
 844         .unlocked_ioctl = ipmi_unlocked_ioctl,
 845 #ifdef CONFIG_COMPAT
 846         .compat_ioctl   = compat_ipmi_ioctl,
 847 #endif
 848         .open           = ipmi_open,
 849         .release        = ipmi_release,
 850         .fasync         = ipmi_fasync,
 851         .poll           = ipmi_poll,
 852 };
 853
 854 #define DEVICE_NAME     "ipmidev"
 855
 856 static int ipmi_major;
 857 module_param(ipmi_major, int, 0);
 858 MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device.  By"
 859                  " default, or if you set it to zero, it will choose the next"
 860                  " available device.  Setting it to -1 will disable the"
 861                  " interface.  Other values will set the major device number"
 862                  " to that value.");
 863
 864 /* Keep track of the devices that are registered. */
 865 struct ipmi_reg_list {
 866         dev_t            dev;
 867         struct list_head link;
 868 };
 869 static LIST_HEAD(reg_list);
 870 static DEFINE_MUTEX(reg_list_mutex);
 871
 872 static struct class *ipmi_class;
 873
 874 static void ipmi_new_smi(int if_num, struct device *device)
 875 {
 876         dev_t dev = MKDEV(ipmi_major, if_num);
 877         struct ipmi_reg_list *entry;
 878
 879         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 880         if (!entry) {
 881                 printk(KERN_ERR "ipmi_devintf: Unable to create the"
 882                        " ipmi class device link\n");
 883                 return;
 884         }
 885         entry->dev = dev;
 886
 887         mutex_lock(&reg_list_mutex);
 888         device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
 889         list_add(&entry->link, &reg_list);
 890         mutex_unlock(&reg_list_mutex);
 891 }
 892
 893 static void ipmi_smi_gone(int if_num)
 894 {
 895         dev_t dev = MKDEV(ipmi_major, if_num);
 896         struct ipmi_reg_list *entry;
 897
 898         mutex_lock(&reg_list_mutex);
 899         list_for_each_entry(entry, &reg_list, link) {
 900                 if (entry->dev == dev) {
 901                         list_del(&entry->link);
 902                         kfree(entry);
 903                         break;
 904                 }
 905         }
 906         device_destroy(ipmi_class, dev);
 907         mutex_unlock(&reg_list_mutex);
 908 }
 909
 910 static struct ipmi_smi_watcher smi_watcher =
 911 {
 912         .owner    = THIS_MODULE,
 913         .new_smi  = ipmi_new_smi,
 914         .smi_gone = ipmi_smi_gone,
 915 };
 916
 917 static __init int init_ipmi_devintf(void)
 918 {
 919         int rv;
 920
 921         if (ipmi_major < 0)
 922                 return -EINVAL;
 923
 924         printk(KERN_INFO "ipmi device interface\n");
 925
 926         ipmi_class = class_create(THIS_MODULE, "ipmi");
 927         if (IS_ERR(ipmi_class)) {
 928                 printk(KERN_ERR "ipmi: can't register device class\n");
 929                 return PTR_ERR(ipmi_class);
 930         }
 931
 932         rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
 933         if (rv < 0) {
 934                 class_destroy(ipmi_class);
 935                 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
 936                 return rv;
 937         }
 938
 939         if (ipmi_major == 0) {
 940                 ipmi_major = rv;
 941         }
 942
 943         rv = ipmi_smi_watcher_register(&smi_watcher);
 944         if (rv) {
 945                 unregister_chrdev(ipmi_major, DEVICE_NAME);
 946                 class_destroy(ipmi_class);
 947                 printk(KERN_WARNING "ipmi: can't register smi watcher\n");
 948                 return rv;
 949         }
 950
 951         return 0;
 952 }
 953 module_init(init_ipmi_devintf);
 954
 955 static __exit void cleanup_ipmi(void)
 956 {
 957         struct ipmi_reg_list *entry, *entry2;
 958         mutex_lock(&reg_list_mutex);
 959         list_for_each_entry_safe(entry, entry2, &reg_list, link) {
 960                 list_del(&entry->link);
 961                 device_destroy(ipmi_class, entry->dev);
 962                 kfree(entry);
 963         }
 964         mutex_unlock(&reg_list_mutex);
 965         class_destroy(ipmi_class);
 966         ipmi_smi_watcher_unregister(&smi_watcher);
 967         unregister_chrdev(ipmi_major, DEVICE_NAME);
 968 }
 969 module_exit(cleanup_ipmi);
 970
 971 MODULE_LICENSE("GPL");
 972 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 973 MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
 974 MODULE_ALIAS("platform:ipmi_si");