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