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 int 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         return 0;
 275 }
 276
 277 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 278 {
 279         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 280         ide_drive_t *drive = idkp->drive;
 281
 282         geo->heads = drive->bios_head;
 283         geo->sectors = drive->bios_sect;
 284         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 285         return 0;
 286 }
 287
 288 static unsigned int ide_gd_check_events(struct gendisk *disk,
 289                                         unsigned int clearing)
 290 {
 291         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 292         ide_drive_t *drive = idkp->drive;
 293         bool ret;
 294
 295         /* do not scan partitions twice if this is a removable device */
 296         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
 297                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 298                 return 0;
 299         }
 300
 301         /*
 302          * The following is used to force revalidation on the first open on
 303          * removeable devices, and never gets reported to userland as
 304          * genhd->events is 0.  This is intended as removeable ide disk
 305          * can't really detect MEDIA_CHANGE events.
 306          */
 307         ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
 308         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
 309
 310         return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
 311 }
 312
 313 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
 314 {
 315         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 316         ide_drive_t *drive = idkp->drive;
 317         const struct ide_disk_ops *disk_ops = drive->disk_ops;
 318
 319         if (disk_ops->unlock_native_capacity)
 320                 disk_ops->unlock_native_capacity(drive);
 321 }
 322
 323 static int ide_gd_revalidate_disk(struct gendisk *disk)
 324 {
 325         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 326         ide_drive_t *drive = idkp->drive;
 327
 328         if (ide_gd_check_events(disk, 0))
 329                 drive->disk_ops->get_capacity(drive);
 330
 331         set_capacity(disk, ide_gd_capacity(drive));
 332         return 0;
 333 }
 334
 335 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 336                              unsigned int cmd, unsigned long arg)
 337 {
 338         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 339         ide_drive_t *drive = idkp->drive;
 340
 341         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
 342 }
 343
 344 static const struct block_device_operations ide_gd_ops = {
 345         .owner                  = THIS_MODULE,
 346         .open                   = ide_gd_unlocked_open,
 347         .release                = ide_gd_release,
 348         .ioctl                  = ide_gd_ioctl,
 349         .getgeo                 = ide_gd_getgeo,
 350         .check_events           = ide_gd_check_events,
 351         .unlock_native_capacity = ide_gd_unlock_native_capacity,
 352         .revalidate_disk        = ide_gd_revalidate_disk
 353 };
 354
 355 static int ide_gd_probe(ide_drive_t *drive)
 356 {
 357         const struct ide_disk_ops *disk_ops = NULL;
 358         struct ide_disk_obj *idkp;
 359         struct gendisk *g;
 360
 361         /* strstr("foo", "") is non-NULL */
 362         if (!strstr("ide-gd", drive->driver_req))
 363                 goto failed;
 364
 365 #ifdef CONFIG_IDE_GD_ATA
 366         if (drive->media == ide_disk)
 367                 disk_ops = &ide_ata_disk_ops;
 368 #endif
 369 #ifdef CONFIG_IDE_GD_ATAPI
 370         if (drive->media == ide_floppy)
 371                 disk_ops = &ide_atapi_disk_ops;
 372 #endif
 373         if (disk_ops == NULL)
 374                 goto failed;
 375
 376         if (disk_ops->check(drive, DRV_NAME) == 0) {
 377                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
 378                         drive->name);
 379                 goto failed;
 380         }
 381
 382         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
 383         if (!idkp) {
 384                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
 385                         drive->name);
 386                 goto failed;
 387         }
 388
 389         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
 390         if (!g)
 391                 goto out_free_idkp;
 392
 393         ide_init_disk(g, drive);
 394
 395         idkp->dev.parent = &drive->gendev;
 396         idkp->dev.release = ide_disk_release;
 397         dev_set_name(&idkp->dev, dev_name(&drive->gendev));
 398
 399         if (device_register(&idkp->dev))
 400                 goto out_free_disk;
 401
 402         idkp->drive = drive;
 403         idkp->driver = &ide_gd_driver;
 404         idkp->disk = g;
 405
 406         g->private_data = &idkp->driver;
 407
 408         drive->driver_data = idkp;
 409         drive->debug_mask = debug_mask;
 410         drive->disk_ops = disk_ops;
 411
 412         disk_ops->setup(drive);
 413
 414         set_capacity(g, ide_gd_capacity(drive));
 415
 416         g->minors = IDE_DISK_MINORS;
 417         g->driverfs_dev = &drive->gendev;
 418         g->flags |= GENHD_FL_EXT_DEVT;
 419         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 420                 g->flags = GENHD_FL_REMOVABLE;
 421         g->fops = &ide_gd_ops;
 422         add_disk(g);
 423         return 0;
 424
 425 out_free_disk:
 426         put_disk(g);
 427 out_free_idkp:
 428         kfree(idkp);
 429 failed:
 430         return -ENODEV;
 431 }
 432
 433 static int __init ide_gd_init(void)
 434 {
 435         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
 436         return driver_register(&ide_gd_driver.gen_driver);
 437 }
 438
 439 static void __exit ide_gd_exit(void)
 440 {
 441         driver_unregister(&ide_gd_driver.gen_driver);
 442 }
 443
 444 MODULE_ALIAS("ide:*m-disk*");
 445 MODULE_ALIAS("ide-disk");
 446 MODULE_ALIAS("ide:*m-floppy*");
 447 MODULE_ALIAS("ide-floppy");
 448 module_init(ide_gd_init);
 449 module_exit(ide_gd_exit);
 450 MODULE_LICENSE("GPL");
 451 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");