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