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