drivers/char/ipmi/ipmi_devintf.c

   1 /*
   2  * ipmi_devintf.c
   3  *
   4  * Linux device interface for the IPMI message handler.
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         Corey Minyard <minyard@mvista.com>
   8  *         source@mvista.com
   9  *
  10  * Copyright 2002 MontaVista Software Inc.
  11  *
  12  *  This program is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by the
  14  *  Free Software Foundation; either version 2 of the License, or (at your
  15  *  option) any later version.
  16  *
  17  *
  18  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  24  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  26  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  27  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  *  You should have received a copy of the GNU General Public License along
  30  *  with this program; if not, write to the Free Software Foundation, Inc.,
  31  *  675 Mass Ave, Cambridge, MA 02139, USA.
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/errno.h>
  37 #include <linux/poll.h>
  38 #include <linux/sched.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/slab.h>
  41 #include <linux/ipmi.h>
  42 #include <linux/mutex.h>
  43 #include <linux/init.h>
  44 #include <linux/device.h>
  45 #include <linux/compat.h>
  46
  47 struct ipmi_file_private
  48 {
  49         ipmi_user_t          user;
  50         spinlock_t           recv_msg_lock;
  51         struct list_head     recv_msgs;
  52         struct file          *file;
  53         struct fasync_struct *fasync_queue;
  54         wait_queue_head_t    wait;
  55         struct mutex         recv_mutex;
  56         int                  default_retries;
  57         unsigned int         default_retry_time_ms;
  58 };
  59
  60 static DEFINE_MUTEX(ipmi_mutex);
  61 static void file_receive_handler(struct ipmi_recv_msg *msg,
  62                                  void                 *handler_data)
  63 {
  64         struct ipmi_file_private *priv = handler_data;
  65         int                      was_empty;
  66         unsigned long            flags;
  67
  68         spin_lock_irqsave(&(priv->recv_msg_lock), flags);
  69
  70         was_empty = list_empty(&(priv->recv_msgs));
  71         list_add_tail(&(msg->link), &(priv->recv_msgs));
  72
  73         if (was_empty) {
  74                 wake_up_interruptible(&priv->wait);
  75                 kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
  76         }
  77
  78         spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
  79 }
  80
  81 static unsigned int ipmi_poll(struct file *file, poll_table *wait)
  82 {
  83         struct ipmi_file_private *priv = file->private_data;
  84         unsigned int             mask = 0;
  85         unsigned long            flags;
  86
  87         poll_wait(file, &priv->wait, wait);
  88
  89         spin_lock_irqsave(&priv->recv_msg_lock, flags);
  90
  91         if (!list_empty(&(priv->recv_msgs)))
  92                 mask |= (POLLIN | POLLRDNORM);
  93
  94         spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
  95
  96         return mask;
  97 }
  98
  99 static int ipmi_fasync(int fd, struct file *file, int on)
 100 {
 101         struct ipmi_file_private *priv = file->private_data;
 102         int                      result;
 103
 104         mutex_lock(&ipmi_mutex); /* could race against open() otherwise */
 105         result = fasync_helper(fd, file, on, &priv->fasync_queue);
 106         mutex_unlock(&ipmi_mutex);
 107
 108         return (result);
 109 }
 110
 111 static const struct ipmi_user_hndl ipmi_hndlrs =
 112 {
 113         .ipmi_recv_hndl = file_receive_handler,
 114 };
 115
 116 static int ipmi_open(struct inode *inode, struct file *file)
 117 {
 118         int                      if_num = iminor(inode);
 119         int                      rv;
 120         struct ipmi_file_private *priv;
 121
 122
 123         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 124         if (!priv)
 125                 return -ENOMEM;
 126
 127         mutex_lock(&ipmi_mutex);
 128         priv->file = file;
 129
 130         rv = ipmi_create_user(if_num,
 131                               &ipmi_hndlrs,
 132                               priv,
 133                               &(priv->user));
 134         if (rv) {
 135                 kfree(priv);
 136                 goto out;
 137         }
 138
 139         file->private_data = priv;
 140
 141         spin_lock_init(&(priv->recv_msg_lock));
 142         INIT_LIST_HEAD(&(priv->recv_msgs));
 143         init_waitqueue_head(&priv->wait);
 144         priv->fasync_queue = NULL;
 145         mutex_init(&priv->recv_mutex);
 146
 147         /* Use the low-level defaults. */
 148         priv->default_retries = -1;
 149         priv->default_retry_time_ms = 0;
 150
 151 out:
 152         mutex_unlock(&ipmi_mutex);
 153         return rv;
 154 }
 155
 156 static int ipmi_release(struct inode *inode, struct file *file)
 157 {
 158         struct ipmi_file_private *priv = file->private_data;
 159         int                      rv;
 160         struct  ipmi_recv_msg *msg, *next;
 161
 162         rv = ipmi_destroy_user(priv->user);
 163         if (rv)
 164                 return rv;
 165
 166         list_for_each_entry_safe(msg, next, &priv->recv_msgs, link)
 167                 ipmi_free_recv_msg(msg);
 168
 169
 170         kfree(priv);
 171
 172         return 0;
 173 }
 174
 175 static int handle_send_req(ipmi_user_t     user,
 176                            struct ipmi_req *req,
 177                            int             retries,
 178                            unsigned int    retry_time_ms)
 179 {
 180         int              rv;
 181         struct ipmi_addr addr;
 182         struct kernel_ipmi_msg msg;
 183
 184         if (req->addr_len > sizeof(struct ipmi_addr))
 185                 return -EINVAL;
 186
 187         if (copy_from_user(&addr, req->addr, req->addr_len))
 188                 return -EFAULT;
 189
 190         msg.netfn = req->msg.netfn;
 191         msg.cmd = req->msg.cmd;
 192         msg.data_len = req->msg.data_len;
 193         msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
 194         if (!msg.data)
 195                 return -ENOMEM;
 196
 197         /* From here out we cannot return, we must jump to "out" for
 198            error exits to free msgdata. */
 199
 200         rv = ipmi_validate_addr(&addr, req->addr_len);
 201         if (rv)
 202                 goto out;
 203
 204         if (req->msg.data != NULL) {
 205                 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
 206                         rv = -EMSGSIZE;
 207                         goto out;
 208                 }
 209
 210                 if (copy_from_user(msg.data,
 211                                    req->msg.data,
 212                                    req->msg.data_len))
 213                 {
 214                         rv = -EFAULT;
 215                         goto out;
 216                 }
 217         } else {
 218                 msg.data_len = 0;
 219         }
 220
 221         rv = ipmi_request_settime(user,
 222                                   &addr,
 223                                   req->msgid,
 224                                   &msg,
 225                                   NULL,
 226                                   0,
 227                                   retries,
 228                                   retry_time_ms);
 229  out:
 230         kfree(msg.data);
 231         return rv;
 232 }
 233
 234 static int handle_recv(struct ipmi_file_private *priv,
 235                         bool trunc, struct ipmi_recv *rsp,
 236                         int (*copyout)(struct ipmi_recv *, void __user *),
 237                         void __user *to)
 238 {
 239         int              addr_len;
 240         struct list_head *entry;
 241         struct ipmi_recv_msg  *msg;
 242         unsigned long    flags;
 243         int rv = 0;
 244
 245         /* We claim a mutex because we don't want two
 246            users getting something from the queue at a time.
 247            Since we have to release the spinlock before we can
 248            copy the data to the user, it's possible another
 249            user will grab something from the queue, too.  Then
 250            the messages might get out of order if something
 251            fails and the message gets put back onto the
 252            queue.  This mutex prevents that problem. */
 253         mutex_lock(&priv->recv_mutex);
 254
 255         /* Grab the message off the list. */
 256         spin_lock_irqsave(&(priv->recv_msg_lock), flags);
 257         if (list_empty(&(priv->recv_msgs))) {
 258                 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 259                 rv = -EAGAIN;
 260                 goto recv_err;
 261         }
 262         entry = priv->recv_msgs.next;
 263         msg = list_entry(entry, struct ipmi_recv_msg, link);
 264         list_del(entry);
 265         spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 266
 267         addr_len = ipmi_addr_length(msg->addr.addr_type);
 268         if (rsp->addr_len < addr_len)
 269         {
 270                 rv = -EINVAL;
 271                 goto recv_putback_on_err;
 272         }
 273
 274         if (copy_to_user(rsp->addr, &(msg->addr), addr_len)) {
 275                 rv = -EFAULT;
 276                 goto recv_putback_on_err;
 277         }
 278         rsp->addr_len = addr_len;
 279
 280         rsp->recv_type = msg->recv_type;
 281         rsp->msgid = msg->msgid;
 282         rsp->msg.netfn = msg->msg.netfn;
 283         rsp->msg.cmd = msg->msg.cmd;
 284
 285         if (msg->msg.data_len > 0) {
 286                 if (rsp->msg.data_len < msg->msg.data_len) {
 287                         rv = -EMSGSIZE;
 288                         if (trunc)
 289                                 msg->msg.data_len = rsp->msg.data_len;
 290                         else
 291                                 goto recv_putback_on_err;
 292                 }
 293
 294                 if (copy_to_user(rsp->msg.data,
 295                                  msg->msg.data,
 296                                  msg->msg.data_len))
 297                 {
 298                         rv = -EFAULT;
 299                         goto recv_putback_on_err;
 300                 }
 301                 rsp->msg.data_len = msg->msg.data_len;
 302         } else {
 303                 rsp->msg.data_len = 0;
 304         }
 305
 306         rv = copyout(rsp, to);
 307         if (rv)
 308                 goto recv_putback_on_err;
 309
 310         mutex_unlock(&priv->recv_mutex);
 311         ipmi_free_recv_msg(msg);
 312         return 0;
 313
 314 recv_putback_on_err:
 315         /* If we got an error, put the message back onto
 316            the head of the queue. */
 317         spin_lock_irqsave(&(priv->recv_msg_lock), flags);
 318         list_add(entry, &(priv->recv_msgs));
 319         spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
 320 recv_err:
 321         mutex_unlock(&priv->recv_mutex);
 322         return rv;
 323 }
 324
 325 static int copyout_recv(struct ipmi_recv *rsp, void __user *to)
 326 {
 327         return copy_to_user(to, rsp, sizeof(struct ipmi_recv)) ? -EFAULT : 0;
 328 }
 329
 330 static int ipmi_ioctl(struct file   *file,
 331                       unsigned int  cmd,
 332                       unsigned long data)
 333 {
 334         int                      rv = -EINVAL;
 335         struct ipmi_file_private *priv = file->private_data;
 336         void __user *arg = (void __user *)data;
 337
 338         switch (cmd)
 339         {
 340         case IPMICTL_SEND_COMMAND:
 341         {
 342                 struct ipmi_req req;
 343
 344                 if (copy_from_user(&req, arg, sizeof(req))) {
 345                         rv = -EFAULT;
 346                         break;
 347                 }
 348
 349                 rv = handle_send_req(priv->user,
 350                                      &req,
 351                                      priv->default_retries,
 352                                      priv->default_retry_time_ms);
 353                 break;
 354         }
 355
 356         case IPMICTL_SEND_COMMAND_SETTIME:
 357         {
 358                 struct ipmi_req_settime req;
 359
 360                 if (copy_from_user(&req, arg, sizeof(req))) {
 361                         rv = -EFAULT;
 362                         break;
 363                 }
 364
 365                 rv = handle_send_req(priv->user,
 366                                      &req.req,
 367                                      req.retries,
 368                                      req.retry_time_ms);
 369                 break;
 370         }
 371
 372         case IPMICTL_RECEIVE_MSG:
 373         case IPMICTL_RECEIVE_MSG_TRUNC:
 374         {
 375                 struct ipmi_recv      rsp;
 376
 377                 if (copy_from_user(&rsp, arg, sizeof(rsp)))
 378                         rv = -EFAULT;
 379                 else
 380                         rv = handle_recv(priv, cmd == IPMICTL_RECEIVE_MSG_TRUNC,
 381                                          &rsp, copyout_recv, arg);
 382                 break;
 383         }
 384
 385         case IPMICTL_REGISTER_FOR_CMD:
 386         {
 387                 struct ipmi_cmdspec val;
 388
 389                 if (copy_from_user(&val, arg, sizeof(val))) {
 390                         rv = -EFAULT;
 391                         break;
 392                 }
 393
 394                 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
 395                                            IPMI_CHAN_ALL);
 396                 break;
 397         }
 398
 399         case IPMICTL_UNREGISTER_FOR_CMD:
 400         {
 401                 struct ipmi_cmdspec   val;
 402
 403                 if (copy_from_user(&val, arg, sizeof(val))) {
 404                         rv = -EFAULT;
 405                         break;
 406                 }
 407
 408                 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
 409                                              IPMI_CHAN_ALL);
 410                 break;
 411         }
 412
 413         case IPMICTL_REGISTER_FOR_CMD_CHANS:
 414         {
 415                 struct ipmi_cmdspec_chans val;
 416
 417                 if (copy_from_user(&val, arg, sizeof(val))) {
 418                         rv = -EFAULT;
 419                         break;
 420                 }
 421
 422                 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
 423                                            val.chans);
 424                 break;
 425         }
 426
 427         case IPMICTL_UNREGISTER_FOR_CMD_CHANS:
 428         {
 429                 struct ipmi_cmdspec_chans val;
 430
 431                 if (copy_from_user(&val, arg, sizeof(val))) {
 432                         rv = -EFAULT;
 433                         break;
 434                 }
 435
 436                 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
 437                                              val.chans);
 438                 break;
 439         }
 440
 441         case IPMICTL_SET_GETS_EVENTS_CMD:
 442         {
 443                 int val;
 444
 445                 if (copy_from_user(&val, arg, sizeof(val))) {
 446                         rv = -EFAULT;
 447                         break;
 448                 }
 449
 450                 rv = ipmi_set_gets_events(priv->user, val);
 451                 break;
 452         }
 453
 454         /* The next four are legacy, not per-channel. */
 455         case IPMICTL_SET_MY_ADDRESS_CMD:
 456         {
 457                 unsigned int val;
 458
 459                 if (copy_from_user(&val, arg, sizeof(val))) {
 460                         rv = -EFAULT;
 461                         break;
 462                 }
 463
 464                 rv = ipmi_set_my_address(priv->user, 0, val);
 465                 break;
 466         }
 467
 468         case IPMICTL_GET_MY_ADDRESS_CMD:
 469         {
 470                 unsigned int  val;
 471                 unsigned char rval;
 472
 473                 rv = ipmi_get_my_address(priv->user, 0, &rval);
 474                 if (rv)
 475                         break;
 476
 477                 val = rval;
 478
 479                 if (copy_to_user(arg, &val, sizeof(val))) {
 480                         rv = -EFAULT;
 481                         break;
 482                 }
 483                 break;
 484         }
 485
 486         case IPMICTL_SET_MY_LUN_CMD:
 487         {
 488                 unsigned int val;
 489
 490                 if (copy_from_user(&val, arg, sizeof(val))) {
 491                         rv = -EFAULT;
 492                         break;
 493                 }
 494
 495                 rv = ipmi_set_my_LUN(priv->user, 0, val);
 496                 break;
 497         }
 498
 499         case IPMICTL_GET_MY_LUN_CMD:
 500         {
 501                 unsigned int  val;
 502                 unsigned char rval;
 503
 504                 rv = ipmi_get_my_LUN(priv->user, 0, &rval);
 505                 if (rv)
 506                         break;
 507
 508                 val = rval;
 509
 510                 if (copy_to_user(arg, &val, sizeof(val))) {
 511                         rv = -EFAULT;
 512                         break;
 513                 }
 514                 break;
 515         }
 516
 517         case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
 518         {
 519                 struct ipmi_channel_lun_address_set val;
 520
 521                 if (copy_from_user(&val, arg, sizeof(val))) {
 522                         rv = -EFAULT;
 523                         break;
 524                 }
 525
 526                 return ipmi_set_my_address(priv->user, val.channel, val.value);
 527                 break;
 528         }
 529
 530         case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
 531         {
 532                 struct ipmi_channel_lun_address_set val;
 533
 534                 if (copy_from_user(&val, arg, sizeof(val))) {
 535                         rv = -EFAULT;
 536                         break;
 537                 }
 538
 539                 rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
 540                 if (rv)
 541                         break;
 542
 543                 if (copy_to_user(arg, &val, sizeof(val))) {
 544                         rv = -EFAULT;
 545                         break;
 546                 }
 547                 break;
 548         }
 549
 550         case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
 551         {
 552                 struct ipmi_channel_lun_address_set val;
 553
 554                 if (copy_from_user(&val, arg, sizeof(val))) {
 555                         rv = -EFAULT;
 556                         break;
 557                 }
 558
 559                 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
 560                 break;
 561         }
 562
 563         case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
 564         {
 565                 struct ipmi_channel_lun_address_set val;
 566
 567                 if (copy_from_user(&val, arg, sizeof(val))) {
 568                         rv = -EFAULT;
 569                         break;
 570                 }
 571
 572                 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
 573                 if (rv)
 574                         break;
 575
 576                 if (copy_to_user(arg, &val, sizeof(val))) {
 577                         rv = -EFAULT;
 578                         break;
 579                 }
 580                 break;
 581         }
 582
 583         case IPMICTL_SET_TIMING_PARMS_CMD:
 584         {
 585                 struct ipmi_timing_parms parms;
 586
 587                 if (copy_from_user(&parms, arg, sizeof(parms))) {
 588                         rv = -EFAULT;
 589                         break;
 590                 }
 591
 592                 priv->default_retries = parms.retries;
 593                 priv->default_retry_time_ms = parms.retry_time_ms;
 594                 rv = 0;
 595                 break;
 596         }
 597
 598         case IPMICTL_GET_TIMING_PARMS_CMD:
 599         {
 600                 struct ipmi_timing_parms parms;
 601
 602                 parms.retries = priv->default_retries;
 603                 parms.retry_time_ms = priv->default_retry_time_ms;
 604
 605                 if (copy_to_user(arg, &parms, sizeof(parms))) {
 606                         rv = -EFAULT;
 607                         break;
 608                 }
 609
 610                 rv = 0;
 611                 break;
 612         }
 613
 614         case IPMICTL_GET_MAINTENANCE_MODE_CMD:
 615         {
 616                 int mode;
 617
 618                 mode = ipmi_get_maintenance_mode(priv->user);
 619                 if (copy_to_user(arg, &mode, sizeof(mode))) {
 620                         rv = -EFAULT;
 621                         break;
 622                 }
 623                 rv = 0;
 624                 break;
 625         }
 626
 627         case IPMICTL_SET_MAINTENANCE_MODE_CMD:
 628         {
 629                 int mode;
 630
 631                 if (copy_from_user(&mode, arg, sizeof(mode))) {
 632                         rv = -EFAULT;
 633                         break;
 634                 }
 635                 rv = ipmi_set_maintenance_mode(priv->user, mode);
 636                 break;
 637         }
 638         }
 639
 640         return rv;
 641 }
 642
 643 /*
 644  * Note: it doesn't make sense to take the BKL here but
 645  *       not in compat_ipmi_ioctl. -arnd
 646  */
 647 static long ipmi_unlocked_ioctl(struct file   *file,
 648                                 unsigned int  cmd,
 649                                 unsigned long data)
 650 {
 651         int ret;
 652
 653         mutex_lock(&ipmi_mutex);
 654         ret = ipmi_ioctl(file, cmd, data);
 655         mutex_unlock(&ipmi_mutex);
 656
 657         return ret;
 658 }
 659
 660 #ifdef CONFIG_COMPAT
 661
 662 /*
 663  * The following code contains code for supporting 32-bit compatible
 664  * ioctls on 64-bit kernels.  This allows running 32-bit apps on the
 665  * 64-bit kernel
 666  */
 667 #define COMPAT_IPMICTL_SEND_COMMAND     \
 668         _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req)
 669 #define COMPAT_IPMICTL_SEND_COMMAND_SETTIME     \
 670         _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime)
 671 #define COMPAT_IPMICTL_RECEIVE_MSG      \
 672         _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv)
 673 #define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC        \
 674         _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv)
 675
 676 struct compat_ipmi_msg {
 677         u8              netfn;
 678         u8              cmd;
 679         u16             data_len;
 680         compat_uptr_t   data;
 681 };
 682
 683 struct compat_ipmi_req {
 684         compat_uptr_t           addr;
 685         compat_uint_t           addr_len;
 686         compat_long_t           msgid;
 687         struct compat_ipmi_msg  msg;
 688 };
 689
 690 struct compat_ipmi_recv {
 691         compat_int_t            recv_type;
 692         compat_uptr_t           addr;
 693         compat_uint_t           addr_len;
 694         compat_long_t           msgid;
 695         struct compat_ipmi_msg  msg;
 696 };
 697
 698 struct compat_ipmi_req_settime {
 699         struct compat_ipmi_req  req;
 700         compat_int_t            retries;
 701         compat_uint_t           retry_time_ms;
 702 };
 703
 704 /*
 705  * Define some helper functions for copying IPMI data
 706  */
 707 static void get_compat_ipmi_msg(struct ipmi_msg *p64,
 708                                 struct compat_ipmi_msg *p32)
 709 {
 710         p64->netfn = p32->netfn;
 711         p64->cmd = p32->cmd;
 712         p64->data_len = p32->data_len;
 713         p64->data = compat_ptr(p32->data);
 714 }
 715
 716 static void get_compat_ipmi_req(struct ipmi_req *p64,
 717                                 struct compat_ipmi_req *p32)
 718 {
 719         p64->addr = compat_ptr(p32->addr);
 720         p64->addr_len = p32->addr_len;
 721         p64->msgid = p32->msgid;
 722         get_compat_ipmi_msg(&p64->msg, &p32->msg);
 723 }
 724
 725 static void get_compat_ipmi_req_settime(struct ipmi_req_settime *p64,
 726                 struct compat_ipmi_req_settime *p32)
 727 {
 728         get_compat_ipmi_req(&p64->req, &p32->req);
 729         p64->retries = p32->retries;
 730         p64->retry_time_ms = p32->retry_time_ms;
 731 }
 732
 733 static void get_compat_ipmi_recv(struct ipmi_recv *p64,
 734                                  struct compat_ipmi_recv *p32)
 735 {
 736         memset(p64, 0, sizeof(struct ipmi_recv));
 737         p64->recv_type = p32->recv_type;
 738         p64->addr = compat_ptr(p32->addr);
 739         p64->addr_len = p32->addr_len;
 740         p64->msgid = p32->msgid;
 741         get_compat_ipmi_msg(&p64->msg, &p32->msg);
 742 }
 743
 744 static int copyout_recv32(struct ipmi_recv *p64, void __user *to)
 745 {
 746         struct compat_ipmi_recv v32;
 747         memset(&v32, 0, sizeof(struct compat_ipmi_recv));
 748         v32.recv_type = p64->recv_type;
 749         v32.addr = ptr_to_compat(p64->addr);
 750         v32.addr_len = p64->addr_len;
 751         v32.msgid = p64->msgid;
 752         v32.msg.netfn = p64->msg.netfn;
 753         v32.msg.cmd = p64->msg.cmd;
 754         v32.msg.data_len = p64->msg.data_len;
 755         v32.msg.data = ptr_to_compat(p64->msg.data);
 756         return copy_to_user(to, &v32, sizeof(v32)) ? -EFAULT : 0;
 757 }
 758
 759 /*
 760  * Handle compatibility ioctls
 761  */
 762 static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
 763                               unsigned long arg)
 764 {
 765         struct ipmi_file_private *priv = filep->private_data;
 766
 767         switch(cmd) {
 768         case COMPAT_IPMICTL_SEND_COMMAND:
 769         {
 770                 struct ipmi_req rp;
 771                 struct compat_ipmi_req r32;
 772
 773                 if (copy_from_user(&r32, compat_ptr(arg), sizeof(r32)))
 774                         return -EFAULT;
 775
 776                 get_compat_ipmi_req(&rp, &r32);
 777
 778                 return handle_send_req(priv->user, &rp,
 779                                 priv->default_retries,
 780                                 priv->default_retry_time_ms);
 781         }
 782         case COMPAT_IPMICTL_SEND_COMMAND_SETTIME:
 783         {
 784                 struct ipmi_req_settime sp;
 785                 struct compat_ipmi_req_settime sp32;
 786
 787                 if (copy_from_user(&sp32, compat_ptr(arg), sizeof(sp32)))
 788                         return -EFAULT;
 789
 790                 get_compat_ipmi_req_settime(&sp, &sp32);
 791
 792                 return handle_send_req(priv->user, &sp.req,
 793                                 sp.retries, sp.retry_time_ms);
 794         }
 795         case COMPAT_IPMICTL_RECEIVE_MSG:
 796         case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC:
 797         {
 798                 struct ipmi_recv   recv64;
 799                 struct compat_ipmi_recv recv32;
 800
 801                 if (copy_from_user(&recv32, compat_ptr(arg), sizeof(recv32)))
 802                         return -EFAULT;
 803
 804                 get_compat_ipmi_recv(&recv64, &recv32);
 805
 806                 return handle_recv(priv,
 807                                  cmd == COMPAT_IPMICTL_RECEIVE_MSG_TRUNC,
 808                                  &recv64, copyout_recv32, compat_ptr(arg));
 809         }
 810         default:
 811                 return ipmi_ioctl(filep, cmd, arg);
 812         }
 813 }
 814
 815 static long unlocked_compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
 816                                        unsigned long arg)
 817 {
 818         int ret;
 819
 820         mutex_lock(&ipmi_mutex);
 821         ret = compat_ipmi_ioctl(filep, cmd, arg);
 822         mutex_unlock(&ipmi_mutex);
 823
 824         return ret;
 825 }
 826 #endif
 827
 828 static const struct file_operations ipmi_fops = {
 829         .owner          = THIS_MODULE,
 830         .unlocked_ioctl = ipmi_unlocked_ioctl,
 831 #ifdef CONFIG_COMPAT
 832         .compat_ioctl   = unlocked_compat_ipmi_ioctl,
 833 #endif
 834         .open           = ipmi_open,
 835         .release        = ipmi_release,
 836         .fasync         = ipmi_fasync,
 837         .poll           = ipmi_poll,
 838         .llseek         = noop_llseek,
 839 };
 840
 841 #define DEVICE_NAME     "ipmidev"
 842
 843 static int ipmi_major;
 844 module_param(ipmi_major, int, 0);
 845 MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device.  By"
 846                  " default, or if you set it to zero, it will choose the next"
 847                  " available device.  Setting it to -1 will disable the"
 848                  " interface.  Other values will set the major device number"
 849                  " to that value.");
 850
 851 /* Keep track of the devices that are registered. */
 852 struct ipmi_reg_list {
 853         dev_t            dev;
 854         struct list_head link;
 855 };
 856 static LIST_HEAD(reg_list);
 857 static DEFINE_MUTEX(reg_list_mutex);
 858
 859 static struct class *ipmi_class;
 860
 861 static void ipmi_new_smi(int if_num, struct device *device)
 862 {
 863         dev_t dev = MKDEV(ipmi_major, if_num);
 864         struct ipmi_reg_list *entry;
 865
 866         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 867         if (!entry) {
 868                 printk(KERN_ERR "ipmi_devintf: Unable to create the"
 869                        " ipmi class device link\n");
 870                 return;
 871         }
 872         entry->dev = dev;
 873
 874         mutex_lock(&reg_list_mutex);
 875         device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
 876         list_add(&entry->link, &reg_list);
 877         mutex_unlock(&reg_list_mutex);
 878 }
 879
 880 static void ipmi_smi_gone(int if_num)
 881 {
 882         dev_t dev = MKDEV(ipmi_major, if_num);
 883         struct ipmi_reg_list *entry;
 884
 885         mutex_lock(&reg_list_mutex);
 886         list_for_each_entry(entry, &reg_list, link) {
 887                 if (entry->dev == dev) {
 888                         list_del(&entry->link);
 889                         kfree(entry);
 890                         break;
 891                 }
 892         }
 893         device_destroy(ipmi_class, dev);
 894         mutex_unlock(&reg_list_mutex);
 895 }
 896
 897 static struct ipmi_smi_watcher smi_watcher =
 898 {
 899         .owner    = THIS_MODULE,
 900         .new_smi  = ipmi_new_smi,
 901         .smi_gone = ipmi_smi_gone,
 902 };
 903
 904 static int __init init_ipmi_devintf(void)
 905 {
 906         int rv;
 907
 908         if (ipmi_major < 0)
 909                 return -EINVAL;
 910
 911         printk(KERN_INFO "ipmi device interface\n");
 912
 913         ipmi_class = class_create(THIS_MODULE, "ipmi");
 914         if (IS_ERR(ipmi_class)) {
 915                 printk(KERN_ERR "ipmi: can't register device class\n");
 916                 return PTR_ERR(ipmi_class);
 917         }
 918
 919         rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
 920         if (rv < 0) {
 921                 class_destroy(ipmi_class);
 922                 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
 923                 return rv;
 924         }
 925
 926         if (ipmi_major == 0) {
 927                 ipmi_major = rv;
 928         }
 929
 930         rv = ipmi_smi_watcher_register(&smi_watcher);
 931         if (rv) {
 932                 unregister_chrdev(ipmi_major, DEVICE_NAME);
 933                 class_destroy(ipmi_class);
 934                 printk(KERN_WARNING "ipmi: can't register smi watcher\n");
 935                 return rv;
 936         }
 937
 938         return 0;
 939 }
 940 module_init(init_ipmi_devintf);
 941
 942 static void __exit cleanup_ipmi(void)
 943 {
 944         struct ipmi_reg_list *entry, *entry2;
 945         mutex_lock(&reg_list_mutex);
 946         list_for_each_entry_safe(entry, entry2, &reg_list, link) {
 947                 list_del(&entry->link);
 948                 device_destroy(ipmi_class, entry->dev);
 949                 kfree(entry);
 950         }
 951         mutex_unlock(&reg_list_mutex);
 952         class_destroy(ipmi_class);
 953         ipmi_smi_watcher_unregister(&smi_watcher);
 954         unregister_chrdev(ipmi_major, DEVICE_NAME);
 955 }
 956 module_exit(cleanup_ipmi);
 957
 958 MODULE_LICENSE("GPL");
 959 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 960 MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");