drivers/ide/ide-gd.c

   1 #include <linux/module.h>
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4 #include <linux/kernel.h>
   5 #include <linux/errno.h>
   6 #include <linux/genhd.h>
   7 #include <linux/mutex.h>
   8 #include <linux/ide.h>
   9 #include <linux/hdreg.h>
  10 #include <linux/dmi.h>
  11 #include <linux/slab.h>
  12
  13 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  14 #define IDE_DISK_MINORS         (1 << PARTN_BITS)
  15 #else
  16 #define IDE_DISK_MINORS         0
  17 #endif
  18
  19 #include "ide-disk.h"
  20 #include "ide-floppy.h"
  21
  22 #define IDE_GD_VERSION  "1.18"
  23
  24 /* module parameters */
  25 static DEFINE_MUTEX(ide_gd_mutex);
  26 static unsigned long debug_mask;
  27 module_param(debug_mask, ulong, 0644);
  28
  29 static DEFINE_MUTEX(ide_disk_ref_mutex);
  30
  31 static void ide_disk_release(struct device *);
  32
  33 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
  34 {
  35         struct ide_disk_obj *idkp = NULL;
  36
  37         mutex_lock(&ide_disk_ref_mutex);
  38         idkp = ide_drv_g(disk, ide_disk_obj);
  39         if (idkp) {
  40                 if (ide_device_get(idkp->drive))
  41                         idkp = NULL;
  42                 else
  43                         get_device(&idkp->dev);
  44         }
  45         mutex_unlock(&ide_disk_ref_mutex);
  46         return idkp;
  47 }
  48
  49 static void ide_disk_put(struct ide_disk_obj *idkp)
  50 {
  51         ide_drive_t *drive = idkp->drive;
  52
  53         mutex_lock(&ide_disk_ref_mutex);
  54         put_device(&idkp->dev);
  55         ide_device_put(drive);
  56         mutex_unlock(&ide_disk_ref_mutex);
  57 }
  58
  59 sector_t ide_gd_capacity(ide_drive_t *drive)
  60 {
  61         return drive->capacity64;
  62 }
  63
  64 static int ide_gd_probe(ide_drive_t *);
  65
  66 static void ide_gd_remove(ide_drive_t *drive)
  67 {
  68         struct ide_disk_obj *idkp = drive->driver_data;
  69         struct gendisk *g = idkp->disk;
  70
  71         ide_proc_unregister_driver(drive, idkp->driver);
  72         device_del(&idkp->dev);
  73         del_gendisk(g);
  74         drive->disk_ops->flush(drive);
  75
  76         mutex_lock(&ide_disk_ref_mutex);
  77         put_device(&idkp->dev);
  78         mutex_unlock(&ide_disk_ref_mutex);
  79 }
  80
  81 static void ide_disk_release(struct device *dev)
  82 {
  83         struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
  84         ide_drive_t *drive = idkp->drive;
  85         struct gendisk *g = idkp->disk;
  86
  87         drive->disk_ops = NULL;
  88         drive->driver_data = NULL;
  89         g->private_data = NULL;
  90         put_disk(g);
  91         kfree(idkp);
  92 }
  93
  94 /*
  95  * On HPA drives the capacity needs to be
  96  * reinitialized on resume otherwise the disk
  97  * can not be used and a hard reset is required
  98  */
  99 static void ide_gd_resume(ide_drive_t *drive)
 100 {
 101         if (ata_id_hpa_enabled(drive->id))
 102                 (void)drive->disk_ops->get_capacity(drive);
 103 }
 104
 105 static const struct dmi_system_id ide_coldreboot_table[] = {
 106         {
 107                 /* Acer TravelMate 66x cuts power during reboot */
 108                 .ident   = "Acer TravelMate 660",
 109                 .matches = {
 110                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 111                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
 112                 },
 113         },
 114
 115         { }     /* terminate list */
 116 };
 117
 118 static void ide_gd_shutdown(ide_drive_t *drive)
 119 {
 120 #ifdef  CONFIG_ALPHA
 121         /* On Alpha, halt(8) doesn't actually turn the machine off,
 122            it puts you into the sort of firmware monitor. Typically,
 123            it's used to boot another kernel image, so it's not much
 124            different from reboot(8). Therefore, we don't need to
 125            spin down the disk in this case, especially since Alpha
 126            firmware doesn't handle disks in standby mode properly.
 127            On the other hand, it's reasonably safe to turn the power
 128            off when the shutdown process reaches the firmware prompt,
 129            as the firmware initialization takes rather long time -
 130            at least 10 seconds, which should be sufficient for
 131            the disk to expire its write cache. */
 132         if (system_state != SYSTEM_POWER_OFF) {
 133 #else
 134         if (system_state == SYSTEM_RESTART &&
 135                 !dmi_check_system(ide_coldreboot_table)) {
 136 #endif
 137                 drive->disk_ops->flush(drive);
 138                 return;
 139         }
 140
 141         printk(KERN_INFO "Shutdown: %s\n", drive->name);
 142
 143         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
 144 }
 145
 146 #ifdef CONFIG_IDE_PROC_FS
 147 static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
 148 {
 149         return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
 150 }
 151
 152 static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
 153 {
 154         return (drive->media == ide_disk) ? ide_disk_settings
 155                                           : ide_floppy_settings;
 156 }
 157 #endif
 158
 159 static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
 160                                          struct request *rq, sector_t sector)
 161 {
 162         return drive->disk_ops->do_request(drive, rq, sector);
 163 }
 164
 165 static struct ide_driver ide_gd_driver = {
 166         .gen_driver = {
 167                 .owner          = THIS_MODULE,
 168                 .name           = "ide-gd",
 169                 .bus            = &ide_bus_type,
 170         },
 171         .probe                  = ide_gd_probe,
 172         .remove                 = ide_gd_remove,
 173         .resume                 = ide_gd_resume,
 174         .shutdown               = ide_gd_shutdown,
 175         .version                = IDE_GD_VERSION,
 176         .do_request             = ide_gd_do_request,
 177 #ifdef CONFIG_IDE_PROC_FS
 178         .proc_entries           = ide_disk_proc_entries,
 179         .proc_devsets           = ide_disk_proc_devsets,
 180 #endif
 181 };
 182
 183 static int ide_gd_open(struct block_device *bdev, fmode_t mode)
 184 {
 185         struct gendisk *disk = bdev->bd_disk;
 186         struct ide_disk_obj *idkp;
 187         ide_drive_t *drive;
 188         int ret = 0;
 189
 190         idkp = ide_disk_get(disk);
 191         if (idkp == NULL)
 192                 return -ENXIO;
 193
 194         drive = idkp->drive;
 195
 196         ide_debug_log(IDE_DBG_FUNC, "enter");
 197
 198         idkp->openers++;
 199
 200         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
 201                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 202                 /* Just in case */
 203
 204                 ret = drive->disk_ops->init_media(drive, disk);
 205
 206                 /*
 207                  * Allow O_NDELAY to open a drive without a disk, or with an
 208                  * unreadable disk, so that we can get the format capacity
 209                  * of the drive or begin the format - Sam
 210                  */
 211                 if (ret && (mode & FMODE_NDELAY) == 0) {
 212                         ret = -EIO;
 213                         goto out_put_idkp;
 214                 }
 215
 216                 if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
 217                         ret = -EROFS;
 218                         goto out_put_idkp;
 219                 }
 220
 221                 /*
 222                  * Ignore the return code from door_lock,
 223                  * since the open() has already succeeded,
 224                  * and the door_lock is irrelevant at this point.
 225                  */
 226                 drive->disk_ops->set_doorlock(drive, disk, 1);
 227                 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
 228                 check_disk_change(bdev);
 229         } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
 230                 ret = -EBUSY;
 231                 goto out_put_idkp;
 232         }
 233         return 0;
 234
 235 out_put_idkp:
 236         idkp->openers--;
 237         ide_disk_put(idkp);
 238         return ret;
 239 }
 240
 241 static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
 242 {
 243         int ret;
 244
 245         mutex_lock(&ide_gd_mutex);
 246         ret = ide_gd_open(bdev, mode);
 247         mutex_unlock(&ide_gd_mutex);
 248
 249         return ret;
 250 }
 251
 252
 253 static void ide_gd_release(struct gendisk *disk, fmode_t mode)
 254 {
 255         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 256         ide_drive_t *drive = idkp->drive;
 257
 258         ide_debug_log(IDE_DBG_FUNC, "enter");
 259
 260         mutex_lock(&ide_gd_mutex);
 261         if (idkp->openers == 1)
 262                 drive->disk_ops->flush(drive);
 263
 264         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
 265                 drive->disk_ops->set_doorlock(drive, disk, 0);
 266                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 267         }
 268
 269         idkp->openers--;
 270
 271         ide_disk_put(idkp);
 272         mutex_unlock(&ide_gd_mutex);
 273 }
 274
 275 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 276 {
 277         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 278         ide_drive_t *drive = idkp->drive;
 279
 280         geo->heads = drive->bios_head;
 281         geo->sectors = drive->bios_sect;
 282         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 283         return 0;
 284 }
 285
 286 static unsigned int ide_gd_check_events(struct gendisk *disk,
 287                                         unsigned int clearing)
 288 {
 289         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 290         ide_drive_t *drive = idkp->drive;
 291         bool ret;
 292
 293         /* do not scan partitions twice if this is a removable device */
 294         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
 295                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 296                 return 0;
 297         }
 298
 299         /*
 300          * The following is used to force revalidation on the first open on
 301          * removeable devices, and never gets reported to userland as
 302          * DISK_EVENT_FLAG_UEVENT isn't set in genhd->event_flags.
 303          * This is intended as removable ide disk can't really detect
 304          * MEDIA_CHANGE events.
 305          */
 306         ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
 307         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
 308
 309         return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
 310 }
 311
 312 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
 313 {
 314         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 315         ide_drive_t *drive = idkp->drive;
 316         const struct ide_disk_ops *disk_ops = drive->disk_ops;
 317
 318         if (disk_ops->unlock_native_capacity)
 319                 disk_ops->unlock_native_capacity(drive);
 320 }
 321
 322 static int ide_gd_revalidate_disk(struct gendisk *disk)
 323 {
 324         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 325         ide_drive_t *drive = idkp->drive;
 326
 327         if (ide_gd_check_events(disk, 0))
 328                 drive->disk_ops->get_capacity(drive);
 329
 330         set_capacity(disk, ide_gd_capacity(drive));
 331         return 0;
 332 }
 333
 334 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 335                              unsigned int cmd, unsigned long arg)
 336 {
 337         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 338         ide_drive_t *drive = idkp->drive;
 339
 340         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
 341 }
 342
 343 static const struct block_device_operations ide_gd_ops = {
 344         .owner                  = THIS_MODULE,
 345         .open                   = ide_gd_unlocked_open,
 346         .release                = ide_gd_release,
 347         .ioctl                  = ide_gd_ioctl,
 348         .getgeo                 = ide_gd_getgeo,
 349         .check_events           = ide_gd_check_events,
 350         .unlock_native_capacity = ide_gd_unlock_native_capacity,
 351         .revalidate_disk        = ide_gd_revalidate_disk
 352 };
 353
 354 static int ide_gd_probe(ide_drive_t *drive)
 355 {
 356         const struct ide_disk_ops *disk_ops = NULL;
 357         struct ide_disk_obj *idkp;
 358         struct gendisk *g;
 359
 360         /* strstr("foo", "") is non-NULL */
 361         if (!strstr("ide-gd", drive->driver_req))
 362                 goto failed;
 363
 364 #ifdef CONFIG_IDE_GD_ATA
 365         if (drive->media == ide_disk)
 366                 disk_ops = &ide_ata_disk_ops;
 367 #endif
 368 #ifdef CONFIG_IDE_GD_ATAPI
 369         if (drive->media == ide_floppy)
 370                 disk_ops = &ide_atapi_disk_ops;
 371 #endif
 372         if (disk_ops == NULL)
 373                 goto failed;
 374
 375         if (disk_ops->check(drive, DRV_NAME) == 0) {
 376                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
 377                         drive->name);
 378                 goto failed;
 379         }
 380
 381         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
 382         if (!idkp) {
 383                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
 384                         drive->name);
 385                 goto failed;
 386         }
 387
 388         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
 389         if (!g)
 390                 goto out_free_idkp;
 391
 392         ide_init_disk(g, drive);
 393
 394         idkp->dev.parent = &drive->gendev;
 395         idkp->dev.release = ide_disk_release;
 396         dev_set_name(&idkp->dev, "%s", dev_name(&drive->gendev));
 397
 398         if (device_register(&idkp->dev))
 399                 goto out_free_disk;
 400
 401         idkp->drive = drive;
 402         idkp->driver = &ide_gd_driver;
 403         idkp->disk = g;
 404
 405         g->private_data = &idkp->driver;
 406
 407         drive->driver_data = idkp;
 408         drive->debug_mask = debug_mask;
 409         drive->disk_ops = disk_ops;
 410
 411         disk_ops->setup(drive);
 412
 413         set_capacity(g, ide_gd_capacity(drive));
 414
 415         g->minors = IDE_DISK_MINORS;
 416         g->flags |= GENHD_FL_EXT_DEVT;
 417         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 418                 g->flags = GENHD_FL_REMOVABLE;
 419         g->fops = &ide_gd_ops;
 420         g->events = DISK_EVENT_MEDIA_CHANGE;
 421         device_add_disk(&drive->gendev, g, NULL);
 422         return 0;
 423
 424 out_free_disk:
 425         put_disk(g);
 426 out_free_idkp:
 427         kfree(idkp);
 428 failed:
 429         return -ENODEV;
 430 }
 431
 432 static int __init ide_gd_init(void)
 433 {
 434         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
 435         return driver_register(&ide_gd_driver.gen_driver);
 436 }
 437
 438 static void __exit ide_gd_exit(void)
 439 {
 440         driver_unregister(&ide_gd_driver.gen_driver);
 441 }
 442
 443 MODULE_ALIAS("ide:*m-disk*");
 444 MODULE_ALIAS("ide-disk");
 445 MODULE_ALIAS("ide:*m-floppy*");
 446 MODULE_ALIAS("ide-floppy");
 447 module_init(ide_gd_init);
 448 module_exit(ide_gd_exit);
 449 MODULE_LICENSE("GPL");
 450 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");