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          * genhd->events is 0.  This is intended as removeable ide disk
 303          * can't really detect MEDIA_CHANGE events.
 304          */
 305         ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
 306         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
 307
 308         return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
 309 }
 310
 311 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
 312 {
 313         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 314         ide_drive_t *drive = idkp->drive;
 315         const struct ide_disk_ops *disk_ops = drive->disk_ops;
 316
 317         if (disk_ops->unlock_native_capacity)
 318                 disk_ops->unlock_native_capacity(drive);
 319 }
 320
 321 static int ide_gd_revalidate_disk(struct gendisk *disk)
 322 {
 323         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 324         ide_drive_t *drive = idkp->drive;
 325
 326         if (ide_gd_check_events(disk, 0))
 327                 drive->disk_ops->get_capacity(drive);
 328
 329         set_capacity(disk, ide_gd_capacity(drive));
 330         return 0;
 331 }
 332
 333 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 334                              unsigned int cmd, unsigned long arg)
 335 {
 336         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 337         ide_drive_t *drive = idkp->drive;
 338
 339         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
 340 }
 341
 342 static const struct block_device_operations ide_gd_ops = {
 343         .owner                  = THIS_MODULE,
 344         .open                   = ide_gd_unlocked_open,
 345         .release                = ide_gd_release,
 346         .ioctl                  = ide_gd_ioctl,
 347         .getgeo                 = ide_gd_getgeo,
 348         .check_events           = ide_gd_check_events,
 349         .unlock_native_capacity = ide_gd_unlock_native_capacity,
 350         .revalidate_disk        = ide_gd_revalidate_disk
 351 };
 352
 353 static int ide_gd_probe(ide_drive_t *drive)
 354 {
 355         const struct ide_disk_ops *disk_ops = NULL;
 356         struct ide_disk_obj *idkp;
 357         struct gendisk *g;
 358
 359         /* strstr("foo", "") is non-NULL */
 360         if (!strstr("ide-gd", drive->driver_req))
 361                 goto failed;
 362
 363 #ifdef CONFIG_IDE_GD_ATA
 364         if (drive->media == ide_disk)
 365                 disk_ops = &ide_ata_disk_ops;
 366 #endif
 367 #ifdef CONFIG_IDE_GD_ATAPI
 368         if (drive->media == ide_floppy)
 369                 disk_ops = &ide_atapi_disk_ops;
 370 #endif
 371         if (disk_ops == NULL)
 372                 goto failed;
 373
 374         if (disk_ops->check(drive, DRV_NAME) == 0) {
 375                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
 376                         drive->name);
 377                 goto failed;
 378         }
 379
 380         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
 381         if (!idkp) {
 382                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
 383                         drive->name);
 384                 goto failed;
 385         }
 386
 387         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
 388         if (!g)
 389                 goto out_free_idkp;
 390
 391         ide_init_disk(g, drive);
 392
 393         idkp->dev.parent = &drive->gendev;
 394         idkp->dev.release = ide_disk_release;
 395         dev_set_name(&idkp->dev, "%s", dev_name(&drive->gendev));
 396
 397         if (device_register(&idkp->dev))
 398                 goto out_free_disk;
 399
 400         idkp->drive = drive;
 401         idkp->driver = &ide_gd_driver;
 402         idkp->disk = g;
 403
 404         g->private_data = &idkp->driver;
 405
 406         drive->driver_data = idkp;
 407         drive->debug_mask = debug_mask;
 408         drive->disk_ops = disk_ops;
 409
 410         disk_ops->setup(drive);
 411
 412         set_capacity(g, ide_gd_capacity(drive));
 413
 414         g->minors = IDE_DISK_MINORS;
 415         g->flags |= GENHD_FL_EXT_DEVT;
 416         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 417                 g->flags = GENHD_FL_REMOVABLE;
 418         g->fops = &ide_gd_ops;
 419         device_add_disk(&drive->gendev, g);
 420         return 0;
 421
 422 out_free_disk:
 423         put_disk(g);
 424 out_free_idkp:
 425         kfree(idkp);
 426 failed:
 427         return -ENODEV;
 428 }
 429
 430 static int __init ide_gd_init(void)
 431 {
 432         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
 433         return driver_register(&ide_gd_driver.gen_driver);
 434 }
 435
 436 static void __exit ide_gd_exit(void)
 437 {
 438         driver_unregister(&ide_gd_driver.gen_driver);
 439 }
 440
 441 MODULE_ALIAS("ide:*m-disk*");
 442 MODULE_ALIAS("ide-disk");
 443 MODULE_ALIAS("ide:*m-floppy*");
 444 MODULE_ALIAS("ide-floppy");
 445 module_init(ide_gd_init);
 446 module_exit(ide_gd_exit);
 447 MODULE_LICENSE("GPL");
 448 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");