ipmi_devintf.c revision 233e70f4228e78eb2f80dc6650f65d3ae3dbf17c
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#include <linux/smp_lock.h> 47 48struct 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 61static 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 81static 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 99static 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 lock_kernel(); /* could race against open() otherwise */ 105 result = fasync_helper(fd, file, on, &priv->fasync_queue); 106 unlock_kernel(); 107 108 return (result); 109} 110 111static struct ipmi_user_hndl ipmi_hndlrs = 112{ 113 .ipmi_recv_hndl = file_receive_handler, 114}; 115 116static 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 lock_kernel(); 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 151out: 152 unlock_kernel(); 153 return rv; 154} 155 156static int ipmi_release(struct inode *inode, struct file *file) 157{ 158 struct ipmi_file_private *priv = file->private_data; 159 int rv; 160 161 rv = ipmi_destroy_user(priv->user); 162 if (rv) 163 return rv; 164 165 /* FIXME - free the messages in the list. */ 166 kfree(priv); 167 168 return 0; 169} 170 171static int handle_send_req(ipmi_user_t user, 172 struct ipmi_req *req, 173 int retries, 174 unsigned int retry_time_ms) 175{ 176 int rv; 177 struct ipmi_addr addr; 178 struct kernel_ipmi_msg msg; 179 180 if (req->addr_len > sizeof(struct ipmi_addr)) 181 return -EINVAL; 182 183 if (copy_from_user(&addr, req->addr, req->addr_len)) 184 return -EFAULT; 185 186 msg.netfn = req->msg.netfn; 187 msg.cmd = req->msg.cmd; 188 msg.data_len = req->msg.data_len; 189 msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 190 if (!msg.data) 191 return -ENOMEM; 192 193 /* From here out we cannot return, we must jump to "out" for 194 error exits to free msgdata. */ 195 196 rv = ipmi_validate_addr(&addr, req->addr_len); 197 if (rv) 198 goto out; 199 200 if (req->msg.data != NULL) { 201 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) { 202 rv = -EMSGSIZE; 203 goto out; 204 } 205 206 if (copy_from_user(msg.data, 207 req->msg.data, 208 req->msg.data_len)) 209 { 210 rv = -EFAULT; 211 goto out; 212 } 213 } else { 214 msg.data_len = 0; 215 } 216 217 rv = ipmi_request_settime(user, 218 &addr, 219 req->msgid, 220 &msg, 221 NULL, 222 0, 223 retries, 224 retry_time_ms); 225 out: 226 kfree(msg.data); 227 return rv; 228} 229 230static int ipmi_ioctl(struct inode *inode, 231 struct file *file, 232 unsigned int cmd, 233 unsigned long data) 234{ 235 int rv = -EINVAL; 236 struct ipmi_file_private *priv = file->private_data; 237 void __user *arg = (void __user *)data; 238 239 switch (cmd) 240 { 241 case IPMICTL_SEND_COMMAND: 242 { 243 struct ipmi_req req; 244 245 if (copy_from_user(&req, arg, sizeof(req))) { 246 rv = -EFAULT; 247 break; 248 } 249 250 rv = handle_send_req(priv->user, 251 &req, 252 priv->default_retries, 253 priv->default_retry_time_ms); 254 break; 255 } 256 257 case IPMICTL_SEND_COMMAND_SETTIME: 258 { 259 struct ipmi_req_settime req; 260 261 if (copy_from_user(&req, arg, sizeof(req))) { 262 rv = -EFAULT; 263 break; 264 } 265 266 rv = handle_send_req(priv->user, 267 &req.req, 268 req.retries, 269 req.retry_time_ms); 270 break; 271 } 272 273 case IPMICTL_RECEIVE_MSG: 274 case IPMICTL_RECEIVE_MSG_TRUNC: 275 { 276 struct ipmi_recv rsp; 277 int addr_len; 278 struct list_head *entry; 279 struct ipmi_recv_msg *msg; 280 unsigned long flags; 281 282 283 rv = 0; 284 if (copy_from_user(&rsp, arg, sizeof(rsp))) { 285 rv = -EFAULT; 286 break; 287 } 288 289 /* We claim a mutex because we don't want two 290 users getting something from the queue at a time. 291 Since we have to release the spinlock before we can 292 copy the data to the user, it's possible another 293 user will grab something from the queue, too. Then 294 the messages might get out of order if something 295 fails and the message gets put back onto the 296 queue. This mutex prevents that problem. */ 297 mutex_lock(&priv->recv_mutex); 298 299 /* Grab the message off the list. */ 300 spin_lock_irqsave(&(priv->recv_msg_lock), flags); 301 if (list_empty(&(priv->recv_msgs))) { 302 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); 303 rv = -EAGAIN; 304 goto recv_err; 305 } 306 entry = priv->recv_msgs.next; 307 msg = list_entry(entry, struct ipmi_recv_msg, link); 308 list_del(entry); 309 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); 310 311 addr_len = ipmi_addr_length(msg->addr.addr_type); 312 if (rsp.addr_len < addr_len) 313 { 314 rv = -EINVAL; 315 goto recv_putback_on_err; 316 } 317 318 if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) { 319 rv = -EFAULT; 320 goto recv_putback_on_err; 321 } 322 rsp.addr_len = addr_len; 323 324 rsp.recv_type = msg->recv_type; 325 rsp.msgid = msg->msgid; 326 rsp.msg.netfn = msg->msg.netfn; 327 rsp.msg.cmd = msg->msg.cmd; 328 329 if (msg->msg.data_len > 0) { 330 if (rsp.msg.data_len < msg->msg.data_len) { 331 rv = -EMSGSIZE; 332 if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) { 333 msg->msg.data_len = rsp.msg.data_len; 334 } else { 335 goto recv_putback_on_err; 336 } 337 } 338 339 if (copy_to_user(rsp.msg.data, 340 msg->msg.data, 341 msg->msg.data_len)) 342 { 343 rv = -EFAULT; 344 goto recv_putback_on_err; 345 } 346 rsp.msg.data_len = msg->msg.data_len; 347 } else { 348 rsp.msg.data_len = 0; 349 } 350 351 if (copy_to_user(arg, &rsp, sizeof(rsp))) { 352 rv = -EFAULT; 353 goto recv_putback_on_err; 354 } 355 356 mutex_unlock(&priv->recv_mutex); 357 ipmi_free_recv_msg(msg); 358 break; 359 360 recv_putback_on_err: 361 /* If we got an error, put the message back onto 362 the head of the queue. */ 363 spin_lock_irqsave(&(priv->recv_msg_lock), flags); 364 list_add(entry, &(priv->recv_msgs)); 365 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); 366 mutex_unlock(&priv->recv_mutex); 367 break; 368 369 recv_err: 370 mutex_unlock(&priv->recv_mutex); 371 break; 372 } 373 374 case IPMICTL_REGISTER_FOR_CMD: 375 { 376 struct ipmi_cmdspec val; 377 378 if (copy_from_user(&val, arg, sizeof(val))) { 379 rv = -EFAULT; 380 break; 381 } 382 383 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, 384 IPMI_CHAN_ALL); 385 break; 386 } 387 388 case IPMICTL_UNREGISTER_FOR_CMD: 389 { 390 struct ipmi_cmdspec val; 391 392 if (copy_from_user(&val, arg, sizeof(val))) { 393 rv = -EFAULT; 394 break; 395 } 396 397 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, 398 IPMI_CHAN_ALL); 399 break; 400 } 401 402 case IPMICTL_REGISTER_FOR_CMD_CHANS: 403 { 404 struct ipmi_cmdspec_chans val; 405 406 if (copy_from_user(&val, arg, sizeof(val))) { 407 rv = -EFAULT; 408 break; 409 } 410 411 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, 412 val.chans); 413 break; 414 } 415 416 case IPMICTL_UNREGISTER_FOR_CMD_CHANS: 417 { 418 struct ipmi_cmdspec_chans val; 419 420 if (copy_from_user(&val, arg, sizeof(val))) { 421 rv = -EFAULT; 422 break; 423 } 424 425 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, 426 val.chans); 427 break; 428 } 429 430 case IPMICTL_SET_GETS_EVENTS_CMD: 431 { 432 int val; 433 434 if (copy_from_user(&val, arg, sizeof(val))) { 435 rv = -EFAULT; 436 break; 437 } 438 439 rv = ipmi_set_gets_events(priv->user, val); 440 break; 441 } 442 443 /* The next four are legacy, not per-channel. */ 444 case IPMICTL_SET_MY_ADDRESS_CMD: 445 { 446 unsigned int val; 447 448 if (copy_from_user(&val, arg, sizeof(val))) { 449 rv = -EFAULT; 450 break; 451 } 452 453 rv = ipmi_set_my_address(priv->user, 0, val); 454 break; 455 } 456 457 case IPMICTL_GET_MY_ADDRESS_CMD: 458 { 459 unsigned int val; 460 unsigned char rval; 461 462 rv = ipmi_get_my_address(priv->user, 0, &rval); 463 if (rv) 464 break; 465 466 val = rval; 467 468 if (copy_to_user(arg, &val, sizeof(val))) { 469 rv = -EFAULT; 470 break; 471 } 472 break; 473 } 474 475 case IPMICTL_SET_MY_LUN_CMD: 476 { 477 unsigned int val; 478 479 if (copy_from_user(&val, arg, sizeof(val))) { 480 rv = -EFAULT; 481 break; 482 } 483 484 rv = ipmi_set_my_LUN(priv->user, 0, val); 485 break; 486 } 487 488 case IPMICTL_GET_MY_LUN_CMD: 489 { 490 unsigned int val; 491 unsigned char rval; 492 493 rv = ipmi_get_my_LUN(priv->user, 0, &rval); 494 if (rv) 495 break; 496 497 val = rval; 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_ADDRESS_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 return ipmi_set_my_address(priv->user, val.channel, val.value); 516 break; 517 } 518 519 case IPMICTL_GET_MY_CHANNEL_ADDRESS_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_address(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_MY_CHANNEL_LUN_CMD: 540 { 541 struct ipmi_channel_lun_address_set val; 542 543 if (copy_from_user(&val, arg, sizeof(val))) { 544 rv = -EFAULT; 545 break; 546 } 547 548 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value); 549 break; 550 } 551 552 case IPMICTL_GET_MY_CHANNEL_LUN_CMD: 553 { 554 struct ipmi_channel_lun_address_set val; 555 556 if (copy_from_user(&val, arg, sizeof(val))) { 557 rv = -EFAULT; 558 break; 559 } 560 561 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value); 562 if (rv) 563 break; 564 565 if (copy_to_user(arg, &val, sizeof(val))) { 566 rv = -EFAULT; 567 break; 568 } 569 break; 570 } 571 572 case IPMICTL_SET_TIMING_PARMS_CMD: 573 { 574 struct ipmi_timing_parms parms; 575 576 if (copy_from_user(&parms, arg, sizeof(parms))) { 577 rv = -EFAULT; 578 break; 579 } 580 581 priv->default_retries = parms.retries; 582 priv->default_retry_time_ms = parms.retry_time_ms; 583 rv = 0; 584 break; 585 } 586 587 case IPMICTL_GET_TIMING_PARMS_CMD: 588 { 589 struct ipmi_timing_parms parms; 590 591 parms.retries = priv->default_retries; 592 parms.retry_time_ms = priv->default_retry_time_ms; 593 594 if (copy_to_user(arg, &parms, sizeof(parms))) { 595 rv = -EFAULT; 596 break; 597 } 598 599 rv = 0; 600 break; 601 } 602 603 case IPMICTL_GET_MAINTENANCE_MODE_CMD: 604 { 605 int mode; 606 607 mode = ipmi_get_maintenance_mode(priv->user); 608 if (copy_to_user(arg, &mode, sizeof(mode))) { 609 rv = -EFAULT; 610 break; 611 } 612 rv = 0; 613 break; 614 } 615 616 case IPMICTL_SET_MAINTENANCE_MODE_CMD: 617 { 618 int mode; 619 620 if (copy_from_user(&mode, arg, sizeof(mode))) { 621 rv = -EFAULT; 622 break; 623 } 624 rv = ipmi_set_maintenance_mode(priv->user, mode); 625 break; 626 } 627 } 628 629 return rv; 630} 631 632#ifdef CONFIG_COMPAT 633 634/* 635 * The following code contains code for supporting 32-bit compatible 636 * ioctls on 64-bit kernels. This allows running 32-bit apps on the 637 * 64-bit kernel 638 */ 639#define COMPAT_IPMICTL_SEND_COMMAND \ 640 _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req) 641#define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \ 642 _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime) 643#define COMPAT_IPMICTL_RECEIVE_MSG \ 644 _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv) 645#define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \ 646 _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv) 647 648struct compat_ipmi_msg { 649 u8 netfn; 650 u8 cmd; 651 u16 data_len; 652 compat_uptr_t data; 653}; 654 655struct compat_ipmi_req { 656 compat_uptr_t addr; 657 compat_uint_t addr_len; 658 compat_long_t msgid; 659 struct compat_ipmi_msg msg; 660}; 661 662struct compat_ipmi_recv { 663 compat_int_t recv_type; 664 compat_uptr_t addr; 665 compat_uint_t addr_len; 666 compat_long_t msgid; 667 struct compat_ipmi_msg msg; 668}; 669 670struct compat_ipmi_req_settime { 671 struct compat_ipmi_req req; 672 compat_int_t retries; 673 compat_uint_t retry_time_ms; 674}; 675 676/* 677 * Define some helper functions for copying IPMI data 678 */ 679static long get_compat_ipmi_msg(struct ipmi_msg *p64, 680 struct compat_ipmi_msg __user *p32) 681{ 682 compat_uptr_t tmp; 683 684 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || 685 __get_user(p64->netfn, &p32->netfn) || 686 __get_user(p64->cmd, &p32->cmd) || 687 __get_user(p64->data_len, &p32->data_len) || 688 __get_user(tmp, &p32->data)) 689 return -EFAULT; 690 p64->data = compat_ptr(tmp); 691 return 0; 692} 693 694static long put_compat_ipmi_msg(struct ipmi_msg *p64, 695 struct compat_ipmi_msg __user *p32) 696{ 697 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) || 698 __put_user(p64->netfn, &p32->netfn) || 699 __put_user(p64->cmd, &p32->cmd) || 700 __put_user(p64->data_len, &p32->data_len)) 701 return -EFAULT; 702 return 0; 703} 704 705static long get_compat_ipmi_req(struct ipmi_req *p64, 706 struct compat_ipmi_req __user *p32) 707{ 708 709 compat_uptr_t tmp; 710 711 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || 712 __get_user(tmp, &p32->addr) || 713 __get_user(p64->addr_len, &p32->addr_len) || 714 __get_user(p64->msgid, &p32->msgid) || 715 get_compat_ipmi_msg(&p64->msg, &p32->msg)) 716 return -EFAULT; 717 p64->addr = compat_ptr(tmp); 718 return 0; 719} 720 721static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64, 722 struct compat_ipmi_req_settime __user *p32) 723{ 724 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || 725 get_compat_ipmi_req(&p64->req, &p32->req) || 726 __get_user(p64->retries, &p32->retries) || 727 __get_user(p64->retry_time_ms, &p32->retry_time_ms)) 728 return -EFAULT; 729 return 0; 730} 731 732static long get_compat_ipmi_recv(struct ipmi_recv *p64, 733 struct compat_ipmi_recv __user *p32) 734{ 735 compat_uptr_t tmp; 736 737 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || 738 __get_user(p64->recv_type, &p32->recv_type) || 739 __get_user(tmp, &p32->addr) || 740 __get_user(p64->addr_len, &p32->addr_len) || 741 __get_user(p64->msgid, &p32->msgid) || 742 get_compat_ipmi_msg(&p64->msg, &p32->msg)) 743 return -EFAULT; 744 p64->addr = compat_ptr(tmp); 745 return 0; 746} 747 748static long put_compat_ipmi_recv(struct ipmi_recv *p64, 749 struct compat_ipmi_recv __user *p32) 750{ 751 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) || 752 __put_user(p64->recv_type, &p32->recv_type) || 753 __put_user(p64->addr_len, &p32->addr_len) || 754 __put_user(p64->msgid, &p32->msgid) || 755 put_compat_ipmi_msg(&p64->msg, &p32->msg)) 756 return -EFAULT; 757 return 0; 758} 759 760/* 761 * Handle compatibility ioctls 762 */ 763static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd, 764 unsigned long arg) 765{ 766 int rc; 767 struct ipmi_file_private *priv = filep->private_data; 768 769 switch(cmd) { 770 case COMPAT_IPMICTL_SEND_COMMAND: 771 { 772 struct ipmi_req rp; 773 774 if (get_compat_ipmi_req(&rp, compat_ptr(arg))) 775 return -EFAULT; 776 777 return handle_send_req(priv->user, &rp, 778 priv->default_retries, 779 priv->default_retry_time_ms); 780 } 781 case COMPAT_IPMICTL_SEND_COMMAND_SETTIME: 782 { 783 struct ipmi_req_settime sp; 784 785 if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg))) 786 return -EFAULT; 787 788 return handle_send_req(priv->user, &sp.req, 789 sp.retries, sp.retry_time_ms); 790 } 791 case COMPAT_IPMICTL_RECEIVE_MSG: 792 case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC: 793 { 794 struct ipmi_recv __user *precv64; 795 struct ipmi_recv recv64; 796 797 if (get_compat_ipmi_recv(&recv64, compat_ptr(arg))) 798 return -EFAULT; 799 800 precv64 = compat_alloc_user_space(sizeof(recv64)); 801 if (copy_to_user(precv64, &recv64, sizeof(recv64))) 802 return -EFAULT; 803 804 rc = ipmi_ioctl(filep->f_path.dentry->d_inode, filep, 805 ((cmd == COMPAT_IPMICTL_RECEIVE_MSG) 806 ? IPMICTL_RECEIVE_MSG 807 : IPMICTL_RECEIVE_MSG_TRUNC), 808 (unsigned long) precv64); 809 if (rc != 0) 810 return rc; 811 812 if (copy_from_user(&recv64, precv64, sizeof(recv64))) 813 return -EFAULT; 814 815 if (put_compat_ipmi_recv(&recv64, compat_ptr(arg))) 816 return -EFAULT; 817 818 return rc; 819 } 820 default: 821 return ipmi_ioctl(filep->f_path.dentry->d_inode, filep, cmd, arg); 822 } 823} 824#endif 825 826static const struct file_operations ipmi_fops = { 827 .owner = THIS_MODULE, 828 .ioctl = ipmi_ioctl, 829#ifdef CONFIG_COMPAT 830 .compat_ioctl = compat_ipmi_ioctl, 831#endif 832 .open = ipmi_open, 833 .release = ipmi_release, 834 .fasync = ipmi_fasync, 835 .poll = ipmi_poll, 836}; 837 838#define DEVICE_NAME "ipmidev" 839 840static int ipmi_major; 841module_param(ipmi_major, int, 0); 842MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By" 843 " default, or if you set it to zero, it will choose the next" 844 " available device. Setting it to -1 will disable the" 845 " interface. Other values will set the major device number" 846 " to that value."); 847 848/* Keep track of the devices that are registered. */ 849struct ipmi_reg_list { 850 dev_t dev; 851 struct list_head link; 852}; 853static LIST_HEAD(reg_list); 854static DEFINE_MUTEX(reg_list_mutex); 855 856static struct class *ipmi_class; 857 858static void ipmi_new_smi(int if_num, struct device *device) 859{ 860 dev_t dev = MKDEV(ipmi_major, if_num); 861 struct ipmi_reg_list *entry; 862 863 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 864 if (!entry) { 865 printk(KERN_ERR "ipmi_devintf: Unable to create the" 866 " ipmi class device link\n"); 867 return; 868 } 869 entry->dev = dev; 870 871 mutex_lock(®_list_mutex); 872 device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num); 873 list_add(&entry->link, ®_list); 874 mutex_unlock(®_list_mutex); 875} 876 877static void ipmi_smi_gone(int if_num) 878{ 879 dev_t dev = MKDEV(ipmi_major, if_num); 880 struct ipmi_reg_list *entry; 881 882 mutex_lock(®_list_mutex); 883 list_for_each_entry(entry, ®_list, link) { 884 if (entry->dev == dev) { 885 list_del(&entry->link); 886 kfree(entry); 887 break; 888 } 889 } 890 device_destroy(ipmi_class, dev); 891 mutex_unlock(®_list_mutex); 892} 893 894static struct ipmi_smi_watcher smi_watcher = 895{ 896 .owner = THIS_MODULE, 897 .new_smi = ipmi_new_smi, 898 .smi_gone = ipmi_smi_gone, 899}; 900 901static __init int init_ipmi_devintf(void) 902{ 903 int rv; 904 905 if (ipmi_major < 0) 906 return -EINVAL; 907 908 printk(KERN_INFO "ipmi device interface\n"); 909 910 ipmi_class = class_create(THIS_MODULE, "ipmi"); 911 if (IS_ERR(ipmi_class)) { 912 printk(KERN_ERR "ipmi: can't register device class\n"); 913 return PTR_ERR(ipmi_class); 914 } 915 916 rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops); 917 if (rv < 0) { 918 class_destroy(ipmi_class); 919 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major); 920 return rv; 921 } 922 923 if (ipmi_major == 0) { 924 ipmi_major = rv; 925 } 926 927 rv = ipmi_smi_watcher_register(&smi_watcher); 928 if (rv) { 929 unregister_chrdev(ipmi_major, DEVICE_NAME); 930 class_destroy(ipmi_class); 931 printk(KERN_WARNING "ipmi: can't register smi watcher\n"); 932 return rv; 933 } 934 935 return 0; 936} 937module_init(init_ipmi_devintf); 938 939static __exit void cleanup_ipmi(void) 940{ 941 struct ipmi_reg_list *entry, *entry2; 942 mutex_lock(®_list_mutex); 943 list_for_each_entry_safe(entry, entry2, ®_list, link) { 944 list_del(&entry->link); 945 device_destroy(ipmi_class, entry->dev); 946 kfree(entry); 947 } 948 mutex_unlock(®_list_mutex); 949 class_destroy(ipmi_class); 950 ipmi_smi_watcher_unregister(&smi_watcher); 951 unregister_chrdev(ipmi_major, DEVICE_NAME); 952} 953module_exit(cleanup_ipmi); 954 955MODULE_LICENSE("GPL"); 956MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); 957MODULE_DESCRIPTION("Linux device interface for the IPMI message handler."); 958MODULE_ALIAS("platform:ipmi_si"); 959