drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord  <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #define _IDE_C                  /* Tell ide.h it's really us */
  48
  49 #include <linux/module.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/kernel.h>
  53 #include <linux/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/blkpg.h>
  60 #include <linux/slab.h>
  61 #include <linux/init.h>
  62 #include <linux/pci.h>
  63 #include <linux/delay.h>
  64 #include <linux/ide.h>
  65 #include <linux/completion.h>
  66 #include <linux/reboot.h>
  67 #include <linux/cdrom.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/device.h>
  70 #include <linux/bitops.h>
  71
  72 #include <asm/byteorder.h>
  73 #include <asm/irq.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/io.h>
  76
  77
  78 /* default maximum number of failures */
  79 #define IDE_DEFAULT_MAX_FAILURES        1
  80
  81 struct class *ide_port_class;
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 DEFINE_MUTEX(ide_cfg_mtx);
  90
  91 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  92 EXPORT_SYMBOL(ide_lock);
  93
  94 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
  95
  96 static void ide_port_init_devices_data(ide_hwif_t *);
  97
  98 /*
  99  * Do not even *think* about calling this!
 100  */
 101 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 102 {
 103         /* bulk initialize hwif & drive info with zeros */
 104         memset(hwif, 0, sizeof(ide_hwif_t));
 105
 106         /* fill in any non-zero initial values */
 107         hwif->index     = index;
 108         hwif->major     = ide_hwif_to_major[index];
 109
 110         hwif->name[0]   = 'i';
 111         hwif->name[1]   = 'd';
 112         hwif->name[2]   = 'e';
 113         hwif->name[3]   = '0' + index;
 114
 115         hwif->bus_state = BUSSTATE_ON;
 116
 117         init_completion(&hwif->gendev_rel_comp);
 118
 119         default_hwif_iops(hwif);
 120         default_hwif_transport(hwif);
 121
 122         ide_port_init_devices_data(hwif);
 123 }
 124 EXPORT_SYMBOL_GPL(ide_init_port_data);
 125
 126 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 127 {
 128         int unit;
 129
 130         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 131                 ide_drive_t *drive = &hwif->drives[unit];
 132                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 133
 134                 memset(drive, 0, sizeof(*drive));
 135
 136                 drive->media                    = ide_disk;
 137                 drive->select.all               = (unit<<4)|0xa0;
 138                 drive->hwif                     = hwif;
 139                 drive->ctl                      = 0x08;
 140                 drive->ready_stat               = READY_STAT;
 141                 drive->bad_wstat                = BAD_W_STAT;
 142                 drive->special.b.recalibrate    = 1;
 143                 drive->special.b.set_geometry   = 1;
 144                 drive->name[0]                  = 'h';
 145                 drive->name[1]                  = 'd';
 146                 drive->name[2]                  = 'a' + j;
 147                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 148
 149                 INIT_LIST_HEAD(&drive->list);
 150                 init_completion(&drive->gendev_rel_comp);
 151         }
 152 }
 153
 154 static void __init init_ide_data (void)
 155 {
 156         unsigned int index;
 157
 158         /* Initialise all interface structures */
 159         for (index = 0; index < MAX_HWIFS; ++index) {
 160                 ide_hwif_t *hwif = &ide_hwifs[index];
 161
 162                 ide_init_port_data(hwif, index);
 163         }
 164 }
 165
 166 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 167 {
 168         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 169
 170         spin_lock_irq(&ide_lock);
 171         /*
 172          * Remove us from the hwgroup, and free
 173          * the hwgroup if we were the only member
 174          */
 175         if (hwif->next == hwif) {
 176                 BUG_ON(hwgroup->hwif != hwif);
 177                 kfree(hwgroup);
 178         } else {
 179                 /* There is another interface in hwgroup.
 180                  * Unlink us, and set hwgroup->drive and ->hwif to
 181                  * something sane.
 182                  */
 183                 ide_hwif_t *g = hwgroup->hwif;
 184
 185                 while (g->next != hwif)
 186                         g = g->next;
 187                 g->next = hwif->next;
 188                 if (hwgroup->hwif == hwif) {
 189                         /* Chose a random hwif for hwgroup->hwif.
 190                          * It's guaranteed that there are no drives
 191                          * left in the hwgroup.
 192                          */
 193                         BUG_ON(hwgroup->drive != NULL);
 194                         hwgroup->hwif = g;
 195                 }
 196                 BUG_ON(hwgroup->hwif == hwif);
 197         }
 198         spin_unlock_irq(&ide_lock);
 199 }
 200
 201 /* Called with ide_lock held. */
 202 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 203 {
 204         int i;
 205
 206         for (i = 0; i < MAX_DRIVES; i++) {
 207                 ide_drive_t *drive = &hwif->drives[i];
 208
 209                 if (drive->present) {
 210                         spin_unlock_irq(&ide_lock);
 211                         device_unregister(&drive->gendev);
 212                         wait_for_completion(&drive->gendev_rel_comp);
 213                         spin_lock_irq(&ide_lock);
 214                 }
 215         }
 216 }
 217
 218 void ide_port_unregister_devices(ide_hwif_t *hwif)
 219 {
 220         mutex_lock(&ide_cfg_mtx);
 221         spin_lock_irq(&ide_lock);
 222         __ide_port_unregister_devices(hwif);
 223         hwif->present = 0;
 224         ide_port_init_devices_data(hwif);
 225         spin_unlock_irq(&ide_lock);
 226         mutex_unlock(&ide_cfg_mtx);
 227 }
 228 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 229
 230 /**
 231  *      ide_unregister          -       free an IDE interface
 232  *      @hwif: IDE interface
 233  *
 234  *      Perform the final unregister of an IDE interface. At the moment
 235  *      we don't refcount interfaces so this will also get split up.
 236  *
 237  *      Locking:
 238  *      The caller must not hold the IDE locks
 239  *      The drive present/vanishing is not yet properly locked
 240  *      Take care with the callbacks. These have been split to avoid
 241  *      deadlocking the IDE layer. The shutdown callback is called
 242  *      before we take the lock and free resources. It is up to the
 243  *      caller to be sure there is no pending I/O here, and that
 244  *      the interface will not be reopened (present/vanishing locking
 245  *      isn't yet done BTW). After we commit to the final kill we
 246  *      call the cleanup callback with the ide locks held.
 247  *
 248  *      Unregister restores the hwif structures to the default state.
 249  *      This is raving bonkers.
 250  */
 251
 252 void ide_unregister(ide_hwif_t *hwif)
 253 {
 254         ide_hwif_t *g;
 255         ide_hwgroup_t *hwgroup;
 256         int irq_count = 0;
 257
 258         BUG_ON(in_interrupt());
 259         BUG_ON(irqs_disabled());
 260
 261         mutex_lock(&ide_cfg_mtx);
 262
 263         spin_lock_irq(&ide_lock);
 264         if (hwif->present) {
 265                 __ide_port_unregister_devices(hwif);
 266                 hwif->present = 0;
 267         }
 268         spin_unlock_irq(&ide_lock);
 269
 270         ide_proc_unregister_port(hwif);
 271
 272         hwgroup = hwif->hwgroup;
 273         /*
 274          * free the irq if we were the only hwif using it
 275          */
 276         g = hwgroup->hwif;
 277         do {
 278                 if (g->irq == hwif->irq)
 279                         ++irq_count;
 280                 g = g->next;
 281         } while (g != hwgroup->hwif);
 282         if (irq_count == 1)
 283                 free_irq(hwif->irq, hwgroup);
 284
 285         ide_remove_port_from_hwgroup(hwif);
 286
 287         device_unregister(hwif->portdev);
 288         device_unregister(&hwif->gendev);
 289         wait_for_completion(&hwif->gendev_rel_comp);
 290
 291         /*
 292          * Remove us from the kernel's knowledge
 293          */
 294         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 295         kfree(hwif->sg_table);
 296         unregister_blkdev(hwif->major, hwif->name);
 297
 298         if (hwif->dma_base)
 299                 ide_release_dma_engine(hwif);
 300
 301         spin_lock_irq(&ide_lock);
 302         /* restore hwif data to pristine status */
 303         ide_init_port_data(hwif, hwif->index);
 304         spin_unlock_irq(&ide_lock);
 305
 306         mutex_unlock(&ide_cfg_mtx);
 307 }
 308
 309 EXPORT_SYMBOL(ide_unregister);
 310
 311 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 312 {
 313         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 314         hwif->irq = hw->irq;
 315         hwif->chipset = hw->chipset;
 316         hwif->gendev.parent = hw->dev;
 317         hwif->ack_intr = hw->ack_intr;
 318 }
 319 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 320
 321 /*
 322  *      Locks for IDE setting functionality
 323  */
 324
 325 DEFINE_MUTEX(ide_setting_mtx);
 326
 327 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 328
 329 /**
 330  *      ide_spin_wait_hwgroup   -       wait for group
 331  *      @drive: drive in the group
 332  *
 333  *      Wait for an IDE device group to go non busy and then return
 334  *      holding the ide_lock which guards the hwgroup->busy status
 335  *      and right to use it.
 336  */
 337
 338 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 339 {
 340         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 341         unsigned long timeout = jiffies + (3 * HZ);
 342
 343         spin_lock_irq(&ide_lock);
 344
 345         while (hwgroup->busy) {
 346                 unsigned long lflags;
 347                 spin_unlock_irq(&ide_lock);
 348                 local_irq_set(lflags);
 349                 if (time_after(jiffies, timeout)) {
 350                         local_irq_restore(lflags);
 351                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 352                         return -EBUSY;
 353                 }
 354                 local_irq_restore(lflags);
 355                 spin_lock_irq(&ide_lock);
 356         }
 357         return 0;
 358 }
 359
 360 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 361
 362 int set_io_32bit(ide_drive_t *drive, int arg)
 363 {
 364         if (drive->no_io_32bit)
 365                 return -EPERM;
 366
 367         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 368                 return -EINVAL;
 369
 370         if (ide_spin_wait_hwgroup(drive))
 371                 return -EBUSY;
 372
 373         drive->io_32bit = arg;
 374
 375         spin_unlock_irq(&ide_lock);
 376
 377         return 0;
 378 }
 379
 380 static int set_ksettings(ide_drive_t *drive, int arg)
 381 {
 382         if (arg < 0 || arg > 1)
 383                 return -EINVAL;
 384
 385         if (ide_spin_wait_hwgroup(drive))
 386                 return -EBUSY;
 387         drive->keep_settings = arg;
 388         spin_unlock_irq(&ide_lock);
 389
 390         return 0;
 391 }
 392
 393 int set_using_dma(ide_drive_t *drive, int arg)
 394 {
 395 #ifdef CONFIG_BLK_DEV_IDEDMA
 396         ide_hwif_t *hwif = drive->hwif;
 397         int err = -EPERM;
 398
 399         if (arg < 0 || arg > 1)
 400                 return -EINVAL;
 401
 402         if (!drive->id || !(drive->id->capability & 1))
 403                 goto out;
 404
 405         if (hwif->dma_ops == NULL)
 406                 goto out;
 407
 408         err = -EBUSY;
 409         if (ide_spin_wait_hwgroup(drive))
 410                 goto out;
 411         /*
 412          * set ->busy flag, unlock and let it ride
 413          */
 414         hwif->hwgroup->busy = 1;
 415         spin_unlock_irq(&ide_lock);
 416
 417         err = 0;
 418
 419         if (arg) {
 420                 if (ide_set_dma(drive))
 421                         err = -EIO;
 422         } else
 423                 ide_dma_off(drive);
 424
 425         /*
 426          * lock, clear ->busy flag and unlock before leaving
 427          */
 428         spin_lock_irq(&ide_lock);
 429         hwif->hwgroup->busy = 0;
 430         spin_unlock_irq(&ide_lock);
 431 out:
 432         return err;
 433 #else
 434         if (arg < 0 || arg > 1)
 435                 return -EINVAL;
 436
 437         return -EPERM;
 438 #endif
 439 }
 440
 441 int set_pio_mode(ide_drive_t *drive, int arg)
 442 {
 443         struct request *rq;
 444         ide_hwif_t *hwif = drive->hwif;
 445         const struct ide_port_ops *port_ops = hwif->port_ops;
 446
 447         if (arg < 0 || arg > 255)
 448                 return -EINVAL;
 449
 450         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 451             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 452                 return -ENOSYS;
 453
 454         if (drive->special.b.set_tune)
 455                 return -EBUSY;
 456
 457         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 458         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 459
 460         drive->tune_req = (u8) arg;
 461         drive->special.b.set_tune = 1;
 462
 463         blk_execute_rq(drive->queue, NULL, rq, 0);
 464         blk_put_request(rq);
 465
 466         return 0;
 467 }
 468
 469 static int set_unmaskirq(ide_drive_t *drive, int arg)
 470 {
 471         if (drive->no_unmask)
 472                 return -EPERM;
 473
 474         if (arg < 0 || arg > 1)
 475                 return -EINVAL;
 476
 477         if (ide_spin_wait_hwgroup(drive))
 478                 return -EBUSY;
 479         drive->unmask = arg;
 480         spin_unlock_irq(&ide_lock);
 481
 482         return 0;
 483 }
 484
 485 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 486 {
 487         ide_drive_t *drive = dev->driver_data;
 488         ide_hwif_t *hwif = HWIF(drive);
 489         struct request *rq;
 490         struct request_pm_state rqpm;
 491         ide_task_t args;
 492         int ret;
 493
 494         /* Call ACPI _GTM only once */
 495         if (!(drive->dn % 2))
 496                 ide_acpi_get_timing(hwif);
 497
 498         memset(&rqpm, 0, sizeof(rqpm));
 499         memset(&args, 0, sizeof(args));
 500         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 501         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 502         rq->special = &args;
 503         rq->data = &rqpm;
 504         rqpm.pm_step = ide_pm_state_start_suspend;
 505         if (mesg.event == PM_EVENT_PRETHAW)
 506                 mesg.event = PM_EVENT_FREEZE;
 507         rqpm.pm_state = mesg.event;
 508
 509         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 510         blk_put_request(rq);
 511         /* only call ACPI _PS3 after both drivers are suspended */
 512         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 513                  && hwif->drives[1].present)
 514                  || !hwif->drives[0].present
 515                  || !hwif->drives[1].present))
 516                 ide_acpi_set_state(hwif, 0);
 517         return ret;
 518 }
 519
 520 static int generic_ide_resume(struct device *dev)
 521 {
 522         ide_drive_t *drive = dev->driver_data;
 523         ide_hwif_t *hwif = HWIF(drive);
 524         struct request *rq;
 525         struct request_pm_state rqpm;
 526         ide_task_t args;
 527         int err;
 528
 529         /* Call ACPI _STM only once */
 530         if (!(drive->dn % 2)) {
 531                 ide_acpi_set_state(hwif, 1);
 532                 ide_acpi_push_timing(hwif);
 533         }
 534
 535         ide_acpi_exec_tfs(drive);
 536
 537         memset(&rqpm, 0, sizeof(rqpm));
 538         memset(&args, 0, sizeof(args));
 539         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 540         rq->cmd_type = REQ_TYPE_PM_RESUME;
 541         rq->cmd_flags |= REQ_PREEMPT;
 542         rq->special = &args;
 543         rq->data = &rqpm;
 544         rqpm.pm_step = ide_pm_state_start_resume;
 545         rqpm.pm_state = PM_EVENT_ON;
 546
 547         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 548         blk_put_request(rq);
 549
 550         if (err == 0 && dev->driver) {
 551                 ide_driver_t *drv = to_ide_driver(dev->driver);
 552
 553                 if (drv->resume)
 554                         drv->resume(drive);
 555         }
 556
 557         return err;
 558 }
 559
 560 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 561                         unsigned int cmd, unsigned long arg)
 562 {
 563         unsigned long flags;
 564         ide_driver_t *drv;
 565         void __user *p = (void __user *)arg;
 566         int err = 0, (*setfunc)(ide_drive_t *, int);
 567         u8 *val;
 568
 569         switch (cmd) {
 570         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 571         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 572         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 573         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 574         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 575         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 576         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 577         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 578         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 579         }
 580
 581         switch (cmd) {
 582                 case HDIO_OBSOLETE_IDENTITY:
 583                 case HDIO_GET_IDENTITY:
 584                         if (bdev != bdev->bd_contains)
 585                                 return -EINVAL;
 586                         if (drive->id_read == 0)
 587                                 return -ENOMSG;
 588                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 589                                 return -EFAULT;
 590                         return 0;
 591
 592                 case HDIO_GET_NICE:
 593                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 594                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 595                                         drive->nice1 << IDE_NICE_1,
 596                                         (long __user *) arg);
 597 #ifdef CONFIG_IDE_TASK_IOCTL
 598                 case HDIO_DRIVE_TASKFILE:
 599                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 600                                 return -EACCES;
 601                         switch(drive->media) {
 602                                 case ide_disk:
 603                                         return ide_taskfile_ioctl(drive, cmd, arg);
 604                                 default:
 605                                         return -ENOMSG;
 606                         }
 607 #endif /* CONFIG_IDE_TASK_IOCTL */
 608
 609                 case HDIO_DRIVE_CMD:
 610                         if (!capable(CAP_SYS_RAWIO))
 611                                 return -EACCES;
 612                         return ide_cmd_ioctl(drive, cmd, arg);
 613
 614                 case HDIO_DRIVE_TASK:
 615                         if (!capable(CAP_SYS_RAWIO))
 616                                 return -EACCES;
 617                         return ide_task_ioctl(drive, cmd, arg);
 618                 case HDIO_SET_NICE:
 619                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 620                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 621                                 return -EPERM;
 622                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 623                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 624                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 625                                 drive->dsc_overlap = 0;
 626                                 return -EPERM;
 627                         }
 628                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 629                         return 0;
 630                 case HDIO_DRIVE_RESET:
 631                         if (!capable(CAP_SYS_ADMIN))
 632                                 return -EACCES;
 633
 634                         /*
 635                          *      Abort the current command on the
 636                          *      group if there is one, taking
 637                          *      care not to allow anything else
 638                          *      to be queued and to die on the
 639                          *      spot if we miss one somehow
 640                          */
 641
 642                         spin_lock_irqsave(&ide_lock, flags);
 643
 644                         if (HWGROUP(drive)->resetting) {
 645                                 spin_unlock_irqrestore(&ide_lock, flags);
 646                                 return -EBUSY;
 647                         }
 648
 649                         ide_abort(drive, "drive reset");
 650
 651                         BUG_ON(HWGROUP(drive)->handler);
 652
 653                         /* Ensure nothing gets queued after we
 654                            drop the lock. Reset will clear the busy */
 655
 656                         HWGROUP(drive)->busy = 1;
 657                         spin_unlock_irqrestore(&ide_lock, flags);
 658                         (void) ide_do_reset(drive);
 659
 660                         return 0;
 661                 case HDIO_GET_BUSSTATE:
 662                         if (!capable(CAP_SYS_ADMIN))
 663                                 return -EACCES;
 664                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 665                                 return -EFAULT;
 666                         return 0;
 667
 668                 case HDIO_SET_BUSSTATE:
 669                         if (!capable(CAP_SYS_ADMIN))
 670                                 return -EACCES;
 671                         return -EOPNOTSUPP;
 672                 default:
 673                         return -EINVAL;
 674         }
 675
 676 read_val:
 677         mutex_lock(&ide_setting_mtx);
 678         spin_lock_irqsave(&ide_lock, flags);
 679         err = *val;
 680         spin_unlock_irqrestore(&ide_lock, flags);
 681         mutex_unlock(&ide_setting_mtx);
 682         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 683
 684 set_val:
 685         if (bdev != bdev->bd_contains)
 686                 err = -EINVAL;
 687         else {
 688                 if (!capable(CAP_SYS_ADMIN))
 689                         err = -EACCES;
 690                 else {
 691                         mutex_lock(&ide_setting_mtx);
 692                         err = setfunc(drive, arg);
 693                         mutex_unlock(&ide_setting_mtx);
 694                 }
 695         }
 696         return err;
 697 }
 698
 699 EXPORT_SYMBOL(generic_ide_ioctl);
 700
 701 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 702 {
 703         return 1;
 704 }
 705
 706 static char *media_string(ide_drive_t *drive)
 707 {
 708         switch (drive->media) {
 709         case ide_disk:
 710                 return "disk";
 711         case ide_cdrom:
 712                 return "cdrom";
 713         case ide_tape:
 714                 return "tape";
 715         case ide_floppy:
 716                 return "floppy";
 717         case ide_optical:
 718                 return "optical";
 719         default:
 720                 return "UNKNOWN";
 721         }
 722 }
 723
 724 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 725 {
 726         ide_drive_t *drive = to_ide_device(dev);
 727         return sprintf(buf, "%s\n", media_string(drive));
 728 }
 729
 730 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 731 {
 732         ide_drive_t *drive = to_ide_device(dev);
 733         return sprintf(buf, "%s\n", drive->name);
 734 }
 735
 736 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 737 {
 738         ide_drive_t *drive = to_ide_device(dev);
 739         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 740 }
 741
 742 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 743                           char *buf)
 744 {
 745         ide_drive_t *drive = to_ide_device(dev);
 746         return sprintf(buf, "%s\n", drive->id->model);
 747 }
 748
 749 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 750                              char *buf)
 751 {
 752         ide_drive_t *drive = to_ide_device(dev);
 753         return sprintf(buf, "%s\n", drive->id->fw_rev);
 754 }
 755
 756 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 757                            char *buf)
 758 {
 759         ide_drive_t *drive = to_ide_device(dev);
 760         return sprintf(buf, "%s\n", drive->id->serial_no);
 761 }
 762
 763 static struct device_attribute ide_dev_attrs[] = {
 764         __ATTR_RO(media),
 765         __ATTR_RO(drivename),
 766         __ATTR_RO(modalias),
 767         __ATTR_RO(model),
 768         __ATTR_RO(firmware),
 769         __ATTR(serial, 0400, serial_show, NULL),
 770         __ATTR_NULL
 771 };
 772
 773 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 774 {
 775         ide_drive_t *drive = to_ide_device(dev);
 776
 777         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 778         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 779         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 780         return 0;
 781 }
 782
 783 static int generic_ide_probe(struct device *dev)
 784 {
 785         ide_drive_t *drive = to_ide_device(dev);
 786         ide_driver_t *drv = to_ide_driver(dev->driver);
 787
 788         return drv->probe ? drv->probe(drive) : -ENODEV;
 789 }
 790
 791 static int generic_ide_remove(struct device *dev)
 792 {
 793         ide_drive_t *drive = to_ide_device(dev);
 794         ide_driver_t *drv = to_ide_driver(dev->driver);
 795
 796         if (drv->remove)
 797                 drv->remove(drive);
 798
 799         return 0;
 800 }
 801
 802 static void generic_ide_shutdown(struct device *dev)
 803 {
 804         ide_drive_t *drive = to_ide_device(dev);
 805         ide_driver_t *drv = to_ide_driver(dev->driver);
 806
 807         if (dev->driver && drv->shutdown)
 808                 drv->shutdown(drive);
 809 }
 810
 811 struct bus_type ide_bus_type = {
 812         .name           = "ide",
 813         .match          = ide_bus_match,
 814         .uevent         = ide_uevent,
 815         .probe          = generic_ide_probe,
 816         .remove         = generic_ide_remove,
 817         .shutdown       = generic_ide_shutdown,
 818         .dev_attrs      = ide_dev_attrs,
 819         .suspend        = generic_ide_suspend,
 820         .resume         = generic_ide_resume,
 821 };
 822
 823 EXPORT_SYMBOL_GPL(ide_bus_type);
 824
 825 int ide_vlb_clk;
 826 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 827
 828 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 829 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 830
 831 int ide_pci_clk;
 832 EXPORT_SYMBOL_GPL(ide_pci_clk);
 833
 834 module_param_named(pci_clock, ide_pci_clk, int, 0);
 835 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 836
 837 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 838 {
 839         int a, b, i, j = 1;
 840         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 841
 842         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 843             sscanf(s, "%d.%d", &a, &b) != 2)
 844                 return -EINVAL;
 845
 846         i = a * MAX_DRIVES + b;
 847
 848         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 849                 return -EINVAL;
 850
 851         if (j)
 852                 *dev_param_mask |= (1 << i);
 853         else
 854                 *dev_param_mask &= (1 << i);
 855
 856         return 0;
 857 }
 858
 859 static unsigned int ide_nodma;
 860
 861 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 862 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 863
 864 static unsigned int ide_noflush;
 865
 866 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 867 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 868
 869 static unsigned int ide_noprobe;
 870
 871 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 872 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 873
 874 static unsigned int ide_nowerr;
 875
 876 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 877 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 878
 879 static unsigned int ide_cdroms;
 880
 881 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 882 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 883
 884 struct chs_geom {
 885         unsigned int    cyl;
 886         u8              head;
 887         u8              sect;
 888 };
 889
 890 static unsigned int ide_disks;
 891 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 892
 893 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 894 {
 895         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 896
 897         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 898             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 899                 return -EINVAL;
 900
 901         i = a * MAX_DRIVES + b;
 902
 903         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 904                 return -EINVAL;
 905
 906         if (c > INT_MAX || h > 255 || s > 255)
 907                 return -EINVAL;
 908
 909         if (j)
 910                 ide_disks |= (1 << i);
 911         else
 912                 ide_disks &= (1 << i);
 913
 914         ide_disks_chs[i].cyl  = c;
 915         ide_disks_chs[i].head = h;
 916         ide_disks_chs[i].sect = s;
 917
 918         return 0;
 919 }
 920
 921 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 922 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 923
 924 static void ide_dev_apply_params(ide_drive_t *drive)
 925 {
 926         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 927
 928         if (ide_nodma & (1 << i)) {
 929                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 930                 drive->nodma = 1;
 931         }
 932         if (ide_noflush & (1 << i)) {
 933                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 934                                  drive->name);
 935                 drive->noflush = 1;
 936         }
 937         if (ide_noprobe & (1 << i)) {
 938                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 939                 drive->noprobe = 1;
 940         }
 941         if (ide_nowerr & (1 << i)) {
 942                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 943                                  drive->name);
 944                 drive->bad_wstat = BAD_R_STAT;
 945         }
 946         if (ide_cdroms & (1 << i)) {
 947                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 948                 drive->present = 1;
 949                 drive->media = ide_cdrom;
 950                 /* an ATAPI device ignores DRDY */
 951                 drive->ready_stat = 0;
 952         }
 953         if (ide_disks & (1 << i)) {
 954                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 955                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 956                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 957                 drive->forced_geom = 1;
 958                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 959                                  drive->name,
 960                                  drive->cyl, drive->head, drive->sect);
 961                 drive->present = 1;
 962                 drive->media = ide_disk;
 963                 drive->ready_stat = READY_STAT;
 964         }
 965 }
 966
 967 static unsigned int ide_ignore_cable;
 968
 969 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 970 {
 971         int i, j = 1;
 972
 973         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 974                 return -EINVAL;
 975
 976         if (i >= MAX_HWIFS || j < 0 || j > 1)
 977                 return -EINVAL;
 978
 979         if (j)
 980                 ide_ignore_cable |= (1 << i);
 981         else
 982                 ide_ignore_cable &= (1 << i);
 983
 984         return 0;
 985 }
 986
 987 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 988 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 989
 990 void ide_port_apply_params(ide_hwif_t *hwif)
 991 {
 992         int i;
 993
 994         if (ide_ignore_cable & (1 << hwif->index)) {
 995                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 996                                  hwif->name);
 997                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 998         }
 999
1000         for (i = 0; i < MAX_DRIVES; i++)
1001                 ide_dev_apply_params(&hwif->drives[i]);
1002 }
1003
1004 /*
1005  * This is gets invoked once during initialization, to set *everything* up
1006  */
1007 static int __init ide_init(void)
1008 {
1009         int ret;
1010
1011         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1012
1013         ret = bus_register(&ide_bus_type);
1014         if (ret < 0) {
1015                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1016                 return ret;
1017         }
1018
1019         ide_port_class = class_create(THIS_MODULE, "ide_port");
1020         if (IS_ERR(ide_port_class)) {
1021                 ret = PTR_ERR(ide_port_class);
1022                 goto out_port_class;
1023         }
1024
1025         init_ide_data();
1026
1027         proc_ide_create();
1028
1029         return 0;
1030
1031 out_port_class:
1032         bus_unregister(&ide_bus_type);
1033
1034         return ret;
1035 }
1036
1037 static void __exit ide_exit(void)
1038 {
1039         proc_ide_destroy();
1040
1041         class_destroy(ide_port_class);
1042
1043         bus_unregister(&ide_bus_type);
1044 }
1045
1046 module_init(ide_init);
1047 module_exit(ide_exit);
1048
1049 MODULE_LICENSE("GPL");