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  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  91
  92 int noautodma = 0;
  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 /*
 155  * init_ide_data() sets reasonable default values into all fields
 156  * of all instances of the hwifs and drives, but only on the first call.
 157  * Subsequent calls have no effect (they don't wipe out anything).
 158  *
 159  * This routine is normally called at driver initialization time,
 160  * but may also be called MUCH earlier during kernel "command-line"
 161  * parameter processing.  As such, we cannot depend on any other parts
 162  * of the kernel (such as memory allocation) to be functioning yet.
 163  *
 164  * This is too bad, as otherwise we could dynamically allocate the
 165  * ide_drive_t structs as needed, rather than always consuming memory
 166  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 167  *
 168  * FIXME: We should stuff the setup data into __init and copy the
 169  * relevant hwifs/allocate them properly during boot.
 170  */
 171 #define MAGIC_COOKIE 0x12345678
 172 static void __init init_ide_data (void)
 173 {
 174         unsigned int index;
 175         static unsigned long magic_cookie = MAGIC_COOKIE;
 176
 177         if (magic_cookie != MAGIC_COOKIE)
 178                 return;         /* already initialized */
 179         magic_cookie = 0;
 180
 181         /* Initialise all interface structures */
 182         for (index = 0; index < MAX_HWIFS; ++index) {
 183                 ide_hwif_t *hwif = &ide_hwifs[index];
 184
 185                 ide_init_port_data(hwif, index);
 186         }
 187 }
 188
 189 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 190 {
 191         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 192
 193         spin_lock_irq(&ide_lock);
 194         /*
 195          * Remove us from the hwgroup, and free
 196          * the hwgroup if we were the only member
 197          */
 198         if (hwif->next == hwif) {
 199                 BUG_ON(hwgroup->hwif != hwif);
 200                 kfree(hwgroup);
 201         } else {
 202                 /* There is another interface in hwgroup.
 203                  * Unlink us, and set hwgroup->drive and ->hwif to
 204                  * something sane.
 205                  */
 206                 ide_hwif_t *g = hwgroup->hwif;
 207
 208                 while (g->next != hwif)
 209                         g = g->next;
 210                 g->next = hwif->next;
 211                 if (hwgroup->hwif == hwif) {
 212                         /* Chose a random hwif for hwgroup->hwif.
 213                          * It's guaranteed that there are no drives
 214                          * left in the hwgroup.
 215                          */
 216                         BUG_ON(hwgroup->drive != NULL);
 217                         hwgroup->hwif = g;
 218                 }
 219                 BUG_ON(hwgroup->hwif == hwif);
 220         }
 221         spin_unlock_irq(&ide_lock);
 222 }
 223
 224 /* Called with ide_lock held. */
 225 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 226 {
 227         int i;
 228
 229         for (i = 0; i < MAX_DRIVES; i++) {
 230                 ide_drive_t *drive = &hwif->drives[i];
 231
 232                 if (drive->present) {
 233                         spin_unlock_irq(&ide_lock);
 234                         device_unregister(&drive->gendev);
 235                         wait_for_completion(&drive->gendev_rel_comp);
 236                         spin_lock_irq(&ide_lock);
 237                 }
 238         }
 239 }
 240
 241 void ide_port_unregister_devices(ide_hwif_t *hwif)
 242 {
 243         mutex_lock(&ide_cfg_mtx);
 244         spin_lock_irq(&ide_lock);
 245         __ide_port_unregister_devices(hwif);
 246         hwif->present = 0;
 247         ide_port_init_devices_data(hwif);
 248         spin_unlock_irq(&ide_lock);
 249         mutex_unlock(&ide_cfg_mtx);
 250 }
 251 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 252
 253 /**
 254  *      ide_unregister          -       free an IDE interface
 255  *      @hwif: IDE interface
 256  *
 257  *      Perform the final unregister of an IDE interface. At the moment
 258  *      we don't refcount interfaces so this will also get split up.
 259  *
 260  *      Locking:
 261  *      The caller must not hold the IDE locks
 262  *      The drive present/vanishing is not yet properly locked
 263  *      Take care with the callbacks. These have been split to avoid
 264  *      deadlocking the IDE layer. The shutdown callback is called
 265  *      before we take the lock and free resources. It is up to the
 266  *      caller to be sure there is no pending I/O here, and that
 267  *      the interface will not be reopened (present/vanishing locking
 268  *      isn't yet done BTW). After we commit to the final kill we
 269  *      call the cleanup callback with the ide locks held.
 270  *
 271  *      Unregister restores the hwif structures to the default state.
 272  *      This is raving bonkers.
 273  */
 274
 275 void ide_unregister(ide_hwif_t *hwif)
 276 {
 277         ide_hwif_t *g;
 278         ide_hwgroup_t *hwgroup;
 279         int irq_count = 0;
 280
 281         BUG_ON(in_interrupt());
 282         BUG_ON(irqs_disabled());
 283
 284         mutex_lock(&ide_cfg_mtx);
 285
 286         spin_lock_irq(&ide_lock);
 287         if (hwif->present) {
 288                 __ide_port_unregister_devices(hwif);
 289                 hwif->present = 0;
 290         }
 291         spin_unlock_irq(&ide_lock);
 292
 293         ide_proc_unregister_port(hwif);
 294
 295         hwgroup = hwif->hwgroup;
 296         /*
 297          * free the irq if we were the only hwif using it
 298          */
 299         g = hwgroup->hwif;
 300         do {
 301                 if (g->irq == hwif->irq)
 302                         ++irq_count;
 303                 g = g->next;
 304         } while (g != hwgroup->hwif);
 305         if (irq_count == 1)
 306                 free_irq(hwif->irq, hwgroup);
 307
 308         ide_remove_port_from_hwgroup(hwif);
 309
 310         device_unregister(hwif->portdev);
 311         device_unregister(&hwif->gendev);
 312         wait_for_completion(&hwif->gendev_rel_comp);
 313
 314         /*
 315          * Remove us from the kernel's knowledge
 316          */
 317         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 318         kfree(hwif->sg_table);
 319         unregister_blkdev(hwif->major, hwif->name);
 320
 321         if (hwif->dma_base)
 322                 ide_release_dma_engine(hwif);
 323
 324         spin_lock_irq(&ide_lock);
 325         /* restore hwif data to pristine status */
 326         ide_init_port_data(hwif, hwif->index);
 327         spin_unlock_irq(&ide_lock);
 328
 329         mutex_unlock(&ide_cfg_mtx);
 330 }
 331
 332 EXPORT_SYMBOL(ide_unregister);
 333
 334 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 335 {
 336         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 337         hwif->irq = hw->irq;
 338         hwif->chipset = hw->chipset;
 339         hwif->gendev.parent = hw->dev;
 340         hwif->ack_intr = hw->ack_intr;
 341 }
 342 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 343
 344 /*
 345  *      Locks for IDE setting functionality
 346  */
 347
 348 DEFINE_MUTEX(ide_setting_mtx);
 349
 350 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 351
 352 /**
 353  *      ide_spin_wait_hwgroup   -       wait for group
 354  *      @drive: drive in the group
 355  *
 356  *      Wait for an IDE device group to go non busy and then return
 357  *      holding the ide_lock which guards the hwgroup->busy status
 358  *      and right to use it.
 359  */
 360
 361 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 362 {
 363         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 364         unsigned long timeout = jiffies + (3 * HZ);
 365
 366         spin_lock_irq(&ide_lock);
 367
 368         while (hwgroup->busy) {
 369                 unsigned long lflags;
 370                 spin_unlock_irq(&ide_lock);
 371                 local_irq_set(lflags);
 372                 if (time_after(jiffies, timeout)) {
 373                         local_irq_restore(lflags);
 374                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 375                         return -EBUSY;
 376                 }
 377                 local_irq_restore(lflags);
 378                 spin_lock_irq(&ide_lock);
 379         }
 380         return 0;
 381 }
 382
 383 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 384
 385 int set_io_32bit(ide_drive_t *drive, int arg)
 386 {
 387         if (drive->no_io_32bit)
 388                 return -EPERM;
 389
 390         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 391                 return -EINVAL;
 392
 393         if (ide_spin_wait_hwgroup(drive))
 394                 return -EBUSY;
 395
 396         drive->io_32bit = arg;
 397
 398         spin_unlock_irq(&ide_lock);
 399
 400         return 0;
 401 }
 402
 403 static int set_ksettings(ide_drive_t *drive, int arg)
 404 {
 405         if (arg < 0 || arg > 1)
 406                 return -EINVAL;
 407
 408         if (ide_spin_wait_hwgroup(drive))
 409                 return -EBUSY;
 410         drive->keep_settings = arg;
 411         spin_unlock_irq(&ide_lock);
 412
 413         return 0;
 414 }
 415
 416 int set_using_dma(ide_drive_t *drive, int arg)
 417 {
 418 #ifdef CONFIG_BLK_DEV_IDEDMA
 419         ide_hwif_t *hwif = drive->hwif;
 420         int err = -EPERM;
 421
 422         if (arg < 0 || arg > 1)
 423                 return -EINVAL;
 424
 425         if (!drive->id || !(drive->id->capability & 1))
 426                 goto out;
 427
 428         if (hwif->dma_ops == NULL)
 429                 goto out;
 430
 431         err = -EBUSY;
 432         if (ide_spin_wait_hwgroup(drive))
 433                 goto out;
 434         /*
 435          * set ->busy flag, unlock and let it ride
 436          */
 437         hwif->hwgroup->busy = 1;
 438         spin_unlock_irq(&ide_lock);
 439
 440         err = 0;
 441
 442         if (arg) {
 443                 if (ide_set_dma(drive))
 444                         err = -EIO;
 445         } else
 446                 ide_dma_off(drive);
 447
 448         /*
 449          * lock, clear ->busy flag and unlock before leaving
 450          */
 451         spin_lock_irq(&ide_lock);
 452         hwif->hwgroup->busy = 0;
 453         spin_unlock_irq(&ide_lock);
 454 out:
 455         return err;
 456 #else
 457         if (arg < 0 || arg > 1)
 458                 return -EINVAL;
 459
 460         return -EPERM;
 461 #endif
 462 }
 463
 464 int set_pio_mode(ide_drive_t *drive, int arg)
 465 {
 466         struct request *rq;
 467         ide_hwif_t *hwif = drive->hwif;
 468         const struct ide_port_ops *port_ops = hwif->port_ops;
 469
 470         if (arg < 0 || arg > 255)
 471                 return -EINVAL;
 472
 473         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 474             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 475                 return -ENOSYS;
 476
 477         if (drive->special.b.set_tune)
 478                 return -EBUSY;
 479
 480         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 481         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 482
 483         drive->tune_req = (u8) arg;
 484         drive->special.b.set_tune = 1;
 485
 486         blk_execute_rq(drive->queue, NULL, rq, 0);
 487         blk_put_request(rq);
 488
 489         return 0;
 490 }
 491
 492 static int set_unmaskirq(ide_drive_t *drive, int arg)
 493 {
 494         if (drive->no_unmask)
 495                 return -EPERM;
 496
 497         if (arg < 0 || arg > 1)
 498                 return -EINVAL;
 499
 500         if (ide_spin_wait_hwgroup(drive))
 501                 return -EBUSY;
 502         drive->unmask = arg;
 503         spin_unlock_irq(&ide_lock);
 504
 505         return 0;
 506 }
 507
 508 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 509 {
 510         ide_drive_t *drive = dev->driver_data;
 511         ide_hwif_t *hwif = HWIF(drive);
 512         struct request *rq;
 513         struct request_pm_state rqpm;
 514         ide_task_t args;
 515         int ret;
 516
 517         /* Call ACPI _GTM only once */
 518         if (!(drive->dn % 2))
 519                 ide_acpi_get_timing(hwif);
 520
 521         memset(&rqpm, 0, sizeof(rqpm));
 522         memset(&args, 0, sizeof(args));
 523         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 524         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 525         rq->special = &args;
 526         rq->data = &rqpm;
 527         rqpm.pm_step = ide_pm_state_start_suspend;
 528         if (mesg.event == PM_EVENT_PRETHAW)
 529                 mesg.event = PM_EVENT_FREEZE;
 530         rqpm.pm_state = mesg.event;
 531
 532         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 533         blk_put_request(rq);
 534         /* only call ACPI _PS3 after both drivers are suspended */
 535         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 536                  && hwif->drives[1].present)
 537                  || !hwif->drives[0].present
 538                  || !hwif->drives[1].present))
 539                 ide_acpi_set_state(hwif, 0);
 540         return ret;
 541 }
 542
 543 static int generic_ide_resume(struct device *dev)
 544 {
 545         ide_drive_t *drive = dev->driver_data;
 546         ide_hwif_t *hwif = HWIF(drive);
 547         struct request *rq;
 548         struct request_pm_state rqpm;
 549         ide_task_t args;
 550         int err;
 551
 552         /* Call ACPI _STM only once */
 553         if (!(drive->dn % 2)) {
 554                 ide_acpi_set_state(hwif, 1);
 555                 ide_acpi_push_timing(hwif);
 556         }
 557
 558         ide_acpi_exec_tfs(drive);
 559
 560         memset(&rqpm, 0, sizeof(rqpm));
 561         memset(&args, 0, sizeof(args));
 562         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 563         rq->cmd_type = REQ_TYPE_PM_RESUME;
 564         rq->cmd_flags |= REQ_PREEMPT;
 565         rq->special = &args;
 566         rq->data = &rqpm;
 567         rqpm.pm_step = ide_pm_state_start_resume;
 568         rqpm.pm_state = PM_EVENT_ON;
 569
 570         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 571         blk_put_request(rq);
 572
 573         if (err == 0 && dev->driver) {
 574                 ide_driver_t *drv = to_ide_driver(dev->driver);
 575
 576                 if (drv->resume)
 577                         drv->resume(drive);
 578         }
 579
 580         return err;
 581 }
 582
 583 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 584                         unsigned int cmd, unsigned long arg)
 585 {
 586         unsigned long flags;
 587         ide_driver_t *drv;
 588         void __user *p = (void __user *)arg;
 589         int err = 0, (*setfunc)(ide_drive_t *, int);
 590         u8 *val;
 591
 592         switch (cmd) {
 593         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 594         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 595         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 596         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 597         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 598         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 599         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 600         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 601         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 602         }
 603
 604         switch (cmd) {
 605                 case HDIO_OBSOLETE_IDENTITY:
 606                 case HDIO_GET_IDENTITY:
 607                         if (bdev != bdev->bd_contains)
 608                                 return -EINVAL;
 609                         if (drive->id_read == 0)
 610                                 return -ENOMSG;
 611                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 612                                 return -EFAULT;
 613                         return 0;
 614
 615                 case HDIO_GET_NICE:
 616                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 617                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 618                                         drive->nice1 << IDE_NICE_1,
 619                                         (long __user *) arg);
 620 #ifdef CONFIG_IDE_TASK_IOCTL
 621                 case HDIO_DRIVE_TASKFILE:
 622                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 623                                 return -EACCES;
 624                         switch(drive->media) {
 625                                 case ide_disk:
 626                                         return ide_taskfile_ioctl(drive, cmd, arg);
 627                                 default:
 628                                         return -ENOMSG;
 629                         }
 630 #endif /* CONFIG_IDE_TASK_IOCTL */
 631
 632                 case HDIO_DRIVE_CMD:
 633                         if (!capable(CAP_SYS_RAWIO))
 634                                 return -EACCES;
 635                         return ide_cmd_ioctl(drive, cmd, arg);
 636
 637                 case HDIO_DRIVE_TASK:
 638                         if (!capable(CAP_SYS_RAWIO))
 639                                 return -EACCES;
 640                         return ide_task_ioctl(drive, cmd, arg);
 641                 case HDIO_SET_NICE:
 642                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 643                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 644                                 return -EPERM;
 645                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 646                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 647                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 648                                 drive->dsc_overlap = 0;
 649                                 return -EPERM;
 650                         }
 651                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 652                         return 0;
 653                 case HDIO_DRIVE_RESET:
 654                         if (!capable(CAP_SYS_ADMIN))
 655                                 return -EACCES;
 656
 657                         /*
 658                          *      Abort the current command on the
 659                          *      group if there is one, taking
 660                          *      care not to allow anything else
 661                          *      to be queued and to die on the
 662                          *      spot if we miss one somehow
 663                          */
 664
 665                         spin_lock_irqsave(&ide_lock, flags);
 666
 667                         if (HWGROUP(drive)->resetting) {
 668                                 spin_unlock_irqrestore(&ide_lock, flags);
 669                                 return -EBUSY;
 670                         }
 671
 672                         ide_abort(drive, "drive reset");
 673
 674                         BUG_ON(HWGROUP(drive)->handler);
 675
 676                         /* Ensure nothing gets queued after we
 677                            drop the lock. Reset will clear the busy */
 678
 679                         HWGROUP(drive)->busy = 1;
 680                         spin_unlock_irqrestore(&ide_lock, flags);
 681                         (void) ide_do_reset(drive);
 682
 683                         return 0;
 684                 case HDIO_GET_BUSSTATE:
 685                         if (!capable(CAP_SYS_ADMIN))
 686                                 return -EACCES;
 687                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 688                                 return -EFAULT;
 689                         return 0;
 690
 691                 case HDIO_SET_BUSSTATE:
 692                         if (!capable(CAP_SYS_ADMIN))
 693                                 return -EACCES;
 694                         return -EOPNOTSUPP;
 695                 default:
 696                         return -EINVAL;
 697         }
 698
 699 read_val:
 700         mutex_lock(&ide_setting_mtx);
 701         spin_lock_irqsave(&ide_lock, flags);
 702         err = *val;
 703         spin_unlock_irqrestore(&ide_lock, flags);
 704         mutex_unlock(&ide_setting_mtx);
 705         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 706
 707 set_val:
 708         if (bdev != bdev->bd_contains)
 709                 err = -EINVAL;
 710         else {
 711                 if (!capable(CAP_SYS_ADMIN))
 712                         err = -EACCES;
 713                 else {
 714                         mutex_lock(&ide_setting_mtx);
 715                         err = setfunc(drive, arg);
 716                         mutex_unlock(&ide_setting_mtx);
 717                 }
 718         }
 719         return err;
 720 }
 721
 722 EXPORT_SYMBOL(generic_ide_ioctl);
 723
 724 /*
 725  * ide_setup() gets called VERY EARLY during initialization,
 726  * to handle kernel "command line" strings beginning with "ide".
 727  *
 728  * Remember to update Documentation/ide/ide.txt if you change something here.
 729  */
 730 static int __init ide_setup(char *s)
 731 {
 732         printk(KERN_INFO "ide_setup: %s", s);
 733         init_ide_data ();
 734
 735 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 736         if (!strcmp(s, "ide=doubler")) {
 737                 extern int ide_doubler;
 738
 739                 printk(" : Enabled support for IDE doublers\n");
 740                 ide_doubler = 1;
 741                 goto obsolete_option;
 742         }
 743 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
 744
 745         if (!strcmp(s, "ide=nodma")) {
 746                 printk(" : Prevented DMA\n");
 747                 noautodma = 1;
 748                 goto obsolete_option;
 749         }
 750
 751 #ifdef CONFIG_BLK_DEV_IDEACPI
 752         if (!strcmp(s, "ide=noacpi")) {
 753                 //printk(" : Disable IDE ACPI support.\n");
 754                 ide_noacpi = 1;
 755                 goto obsolete_option;
 756         }
 757         if (!strcmp(s, "ide=acpigtf")) {
 758                 //printk(" : Enable IDE ACPI _GTF support.\n");
 759                 ide_acpigtf = 1;
 760                 goto obsolete_option;
 761         }
 762         if (!strcmp(s, "ide=acpionboot")) {
 763                 //printk(" : Call IDE ACPI methods on boot.\n");
 764                 ide_acpionboot = 1;
 765                 goto obsolete_option;
 766         }
 767 #endif /* CONFIG_BLK_DEV_IDEACPI */
 768
 769         printk(" -- BAD OPTION\n");
 770         return 1;
 771 obsolete_option:
 772         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
 773         return 1;
 774 }
 775
 776 EXPORT_SYMBOL(ide_lock);
 777
 778 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 779 {
 780         return 1;
 781 }
 782
 783 static char *media_string(ide_drive_t *drive)
 784 {
 785         switch (drive->media) {
 786         case ide_disk:
 787                 return "disk";
 788         case ide_cdrom:
 789                 return "cdrom";
 790         case ide_tape:
 791                 return "tape";
 792         case ide_floppy:
 793                 return "floppy";
 794         case ide_optical:
 795                 return "optical";
 796         default:
 797                 return "UNKNOWN";
 798         }
 799 }
 800
 801 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 802 {
 803         ide_drive_t *drive = to_ide_device(dev);
 804         return sprintf(buf, "%s\n", media_string(drive));
 805 }
 806
 807 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 808 {
 809         ide_drive_t *drive = to_ide_device(dev);
 810         return sprintf(buf, "%s\n", drive->name);
 811 }
 812
 813 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 814 {
 815         ide_drive_t *drive = to_ide_device(dev);
 816         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 817 }
 818
 819 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 820                           char *buf)
 821 {
 822         ide_drive_t *drive = to_ide_device(dev);
 823         return sprintf(buf, "%s\n", drive->id->model);
 824 }
 825
 826 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 827                              char *buf)
 828 {
 829         ide_drive_t *drive = to_ide_device(dev);
 830         return sprintf(buf, "%s\n", drive->id->fw_rev);
 831 }
 832
 833 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 834                            char *buf)
 835 {
 836         ide_drive_t *drive = to_ide_device(dev);
 837         return sprintf(buf, "%s\n", drive->id->serial_no);
 838 }
 839
 840 static struct device_attribute ide_dev_attrs[] = {
 841         __ATTR_RO(media),
 842         __ATTR_RO(drivename),
 843         __ATTR_RO(modalias),
 844         __ATTR_RO(model),
 845         __ATTR_RO(firmware),
 846         __ATTR(serial, 0400, serial_show, NULL),
 847         __ATTR_NULL
 848 };
 849
 850 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 851 {
 852         ide_drive_t *drive = to_ide_device(dev);
 853
 854         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 855         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 856         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 857         return 0;
 858 }
 859
 860 static int generic_ide_probe(struct device *dev)
 861 {
 862         ide_drive_t *drive = to_ide_device(dev);
 863         ide_driver_t *drv = to_ide_driver(dev->driver);
 864
 865         return drv->probe ? drv->probe(drive) : -ENODEV;
 866 }
 867
 868 static int generic_ide_remove(struct device *dev)
 869 {
 870         ide_drive_t *drive = to_ide_device(dev);
 871         ide_driver_t *drv = to_ide_driver(dev->driver);
 872
 873         if (drv->remove)
 874                 drv->remove(drive);
 875
 876         return 0;
 877 }
 878
 879 static void generic_ide_shutdown(struct device *dev)
 880 {
 881         ide_drive_t *drive = to_ide_device(dev);
 882         ide_driver_t *drv = to_ide_driver(dev->driver);
 883
 884         if (dev->driver && drv->shutdown)
 885                 drv->shutdown(drive);
 886 }
 887
 888 struct bus_type ide_bus_type = {
 889         .name           = "ide",
 890         .match          = ide_bus_match,
 891         .uevent         = ide_uevent,
 892         .probe          = generic_ide_probe,
 893         .remove         = generic_ide_remove,
 894         .shutdown       = generic_ide_shutdown,
 895         .dev_attrs      = ide_dev_attrs,
 896         .suspend        = generic_ide_suspend,
 897         .resume         = generic_ide_resume,
 898 };
 899
 900 EXPORT_SYMBOL_GPL(ide_bus_type);
 901
 902 int ide_vlb_clk;
 903 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 904
 905 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 906 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 907
 908 int ide_pci_clk;
 909 EXPORT_SYMBOL_GPL(ide_pci_clk);
 910
 911 module_param_named(pci_clock, ide_pci_clk, int, 0);
 912 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 913
 914 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 915 {
 916         int a, b, i, j = 1;
 917         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 918
 919         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 920             sscanf(s, "%d.%d", &a, &b) != 2)
 921                 return -EINVAL;
 922
 923         i = a * MAX_DRIVES + b;
 924
 925         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 926                 return -EINVAL;
 927
 928         if (j)
 929                 *dev_param_mask |= (1 << i);
 930         else
 931                 *dev_param_mask &= (1 << i);
 932
 933         return 0;
 934 }
 935
 936 static unsigned int ide_nodma;
 937
 938 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 939 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 940
 941 static unsigned int ide_noflush;
 942
 943 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 944 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 945
 946 static unsigned int ide_noprobe;
 947
 948 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 949 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 950
 951 static unsigned int ide_nowerr;
 952
 953 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 954 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 955
 956 static unsigned int ide_cdroms;
 957
 958 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 959 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 960
 961 struct chs_geom {
 962         unsigned int    cyl;
 963         u8              head;
 964         u8              sect;
 965 };
 966
 967 static unsigned int ide_disks;
 968 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 969
 970 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 971 {
 972         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 973
 974         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 975             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 976                 return -EINVAL;
 977
 978         i = a * MAX_DRIVES + b;
 979
 980         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 981                 return -EINVAL;
 982
 983         if (c > INT_MAX || h > 255 || s > 255)
 984                 return -EINVAL;
 985
 986         if (j)
 987                 ide_disks |= (1 << i);
 988         else
 989                 ide_disks &= (1 << i);
 990
 991         ide_disks_chs[i].cyl  = c;
 992         ide_disks_chs[i].head = h;
 993         ide_disks_chs[i].sect = s;
 994
 995         return 0;
 996 }
 997
 998 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 999 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
1000
1001 static void ide_dev_apply_params(ide_drive_t *drive)
1002 {
1003         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
1004
1005         if (ide_nodma & (1 << i)) {
1006                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
1007                 drive->nodma = 1;
1008         }
1009         if (ide_noflush & (1 << i)) {
1010                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
1011                                  drive->name);
1012                 drive->noflush = 1;
1013         }
1014         if (ide_noprobe & (1 << i)) {
1015                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
1016                 drive->noprobe = 1;
1017         }
1018         if (ide_nowerr & (1 << i)) {
1019                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
1020                                  drive->name);
1021                 drive->bad_wstat = BAD_R_STAT;
1022         }
1023         if (ide_cdroms & (1 << i)) {
1024                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
1025                 drive->present = 1;
1026                 drive->media = ide_cdrom;
1027                 /* an ATAPI device ignores DRDY */
1028                 drive->ready_stat = 0;
1029         }
1030         if (ide_disks & (1 << i)) {
1031                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
1032                 drive->head = drive->bios_head = ide_disks_chs[i].head;
1033                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
1034                 drive->forced_geom = 1;
1035                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
1036                                  drive->name,
1037                                  drive->cyl, drive->head, drive->sect);
1038                 drive->present = 1;
1039                 drive->media = ide_disk;
1040                 drive->ready_stat = READY_STAT;
1041         }
1042 }
1043
1044 static unsigned int ide_ignore_cable;
1045
1046 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
1047 {
1048         int i, j = 1;
1049
1050         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
1051                 return -EINVAL;
1052
1053         if (i >= MAX_HWIFS || j < 0 || j > 1)
1054                 return -EINVAL;
1055
1056         if (j)
1057                 ide_ignore_cable |= (1 << i);
1058         else
1059                 ide_ignore_cable &= (1 << i);
1060
1061         return 0;
1062 }
1063
1064 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
1065 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
1066
1067 void ide_port_apply_params(ide_hwif_t *hwif)
1068 {
1069         int i;
1070
1071         if (ide_ignore_cable & (1 << hwif->index)) {
1072                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1073                                  hwif->name);
1074                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1075         }
1076
1077         for (i = 0; i < MAX_DRIVES; i++)
1078                 ide_dev_apply_params(&hwif->drives[i]);
1079 }
1080
1081 /*
1082  * This is gets invoked once during initialization, to set *everything* up
1083  */
1084 static int __init ide_init(void)
1085 {
1086         int ret;
1087
1088         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1089
1090         ret = bus_register(&ide_bus_type);
1091         if (ret < 0) {
1092                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1093                 return ret;
1094         }
1095
1096         ide_port_class = class_create(THIS_MODULE, "ide_port");
1097         if (IS_ERR(ide_port_class)) {
1098                 ret = PTR_ERR(ide_port_class);
1099                 goto out_port_class;
1100         }
1101
1102         init_ide_data();
1103
1104         proc_ide_create();
1105
1106         return 0;
1107
1108 out_port_class:
1109         bus_unregister(&ide_bus_type);
1110
1111         return ret;
1112 }
1113
1114 #ifdef MODULE
1115 static char *options = NULL;
1116 module_param(options, charp, 0);
1117 MODULE_LICENSE("GPL");
1118
1119 static void __init parse_options (char *line)
1120 {
1121         char *next = line;
1122
1123         if (line == NULL || !*line)
1124                 return;
1125         while ((line = next) != NULL) {
1126                 if ((next = strchr(line,' ')) != NULL)
1127                         *next++ = 0;
1128                 if (!ide_setup(line))
1129                         printk (KERN_INFO "Unknown option '%s'\n", line);
1130         }
1131 }
1132
1133 int __init init_module (void)
1134 {
1135         parse_options(options);
1136         return ide_init();
1137 }
1138
1139 void __exit cleanup_module (void)
1140 {
1141         proc_ide_destroy();
1142
1143         class_destroy(ide_port_class);
1144
1145         bus_unregister(&ide_bus_type);
1146 }
1147
1148 #else /* !MODULE */
1149
1150 __setup("", ide_setup);
1151
1152 module_init(ide_init);
1153
1154 #endif /* MODULE */