ide-gd.c 10.2 KB
Newer Older
1 2 3 4 5 6 7 8 9
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/mutex.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
10
#include <linux/dmi.h>
11 12 13 14 15 16 17 18

#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
#define IDE_DISK_MINORS		(1 << PARTN_BITS)
#else
#define IDE_DISK_MINORS		0
#endif

#include "ide-disk.h"
19
#include "ide-floppy.h"
20 21 22

#define IDE_GD_VERSION	"1.18"

23 24 25 26
/* module parameters */
static unsigned long debug_mask;
module_param(debug_mask, ulong, 0644);

27 28
static DEFINE_MUTEX(ide_disk_ref_mutex);

29
static void ide_disk_release(struct device *);
30 31 32 33 34 35 36 37 38 39 40

static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
{
	struct ide_disk_obj *idkp = NULL;

	mutex_lock(&ide_disk_ref_mutex);
	idkp = ide_drv_g(disk, ide_disk_obj);
	if (idkp) {
		if (ide_device_get(idkp->drive))
			idkp = NULL;
		else
41
			get_device(&idkp->dev);
42 43 44 45 46 47 48 49 50 51
	}
	mutex_unlock(&ide_disk_ref_mutex);
	return idkp;
}

static void ide_disk_put(struct ide_disk_obj *idkp)
{
	ide_drive_t *drive = idkp->drive;

	mutex_lock(&ide_disk_ref_mutex);
52
	put_device(&idkp->dev);
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
	ide_device_put(drive);
	mutex_unlock(&ide_disk_ref_mutex);
}

sector_t ide_gd_capacity(ide_drive_t *drive)
{
	return drive->capacity64;
}

static int ide_gd_probe(ide_drive_t *);

static void ide_gd_remove(ide_drive_t *drive)
{
	struct ide_disk_obj *idkp = drive->driver_data;
	struct gendisk *g = idkp->disk;

	ide_proc_unregister_driver(drive, idkp->driver);
70
	device_del(&idkp->dev);
71
	del_gendisk(g);
72
	drive->disk_ops->flush(drive);
73

74 75 76
	mutex_lock(&ide_disk_ref_mutex);
	put_device(&idkp->dev);
	mutex_unlock(&ide_disk_ref_mutex);
77 78
}

79
static void ide_disk_release(struct device *dev)
80
{
81
	struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
82 83 84
	ide_drive_t *drive = idkp->drive;
	struct gendisk *g = idkp->disk;

85
	drive->disk_ops = NULL;
86 87 88 89 90 91 92 93 94 95 96 97 98 99
	drive->driver_data = NULL;
	g->private_data = NULL;
	put_disk(g);
	kfree(idkp);
}

/*
 * On HPA drives the capacity needs to be
 * reinitilized on resume otherwise the disk
 * can not be used and a hard reset is required
 */
static void ide_gd_resume(ide_drive_t *drive)
{
	if (ata_id_hpa_enabled(drive->id))
100
		(void)drive->disk_ops->get_capacity(drive);
101 102
}

103 104 105 106 107 108 109 110 111 112 113 114 115
static const struct dmi_system_id ide_coldreboot_table[] = {
	{
		/* Acer TravelMate 66x cuts power during reboot */
		.ident   = "Acer TravelMate 660",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
		},
	},

	{ }	/* terminate list */
};

116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131
static void ide_gd_shutdown(ide_drive_t *drive)
{
#ifdef	CONFIG_ALPHA
	/* On Alpha, halt(8) doesn't actually turn the machine off,
	   it puts you into the sort of firmware monitor. Typically,
	   it's used to boot another kernel image, so it's not much
	   different from reboot(8). Therefore, we don't need to
	   spin down the disk in this case, especially since Alpha
	   firmware doesn't handle disks in standby mode properly.
	   On the other hand, it's reasonably safe to turn the power
	   off when the shutdown process reaches the firmware prompt,
	   as the firmware initialization takes rather long time -
	   at least 10 seconds, which should be sufficient for
	   the disk to expire its write cache. */
	if (system_state != SYSTEM_POWER_OFF) {
#else
132 133
	if (system_state == SYSTEM_RESTART &&
		!dmi_check_system(ide_coldreboot_table)) {
134
#endif
135
		drive->disk_ops->flush(drive);
136 137 138 139 140 141 142 143
		return;
	}

	printk(KERN_INFO "Shutdown: %s\n", drive->name);

	drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
}

144 145 146
#ifdef CONFIG_IDE_PROC_FS
static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
{
147
	return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
148 149 150 151
}

static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
{
152 153
	return (drive->media == ide_disk) ? ide_disk_settings
					  : ide_floppy_settings;
154 155 156
}
#endif

157 158 159 160 161 162
static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
					 struct request *rq, sector_t sector)
{
	return drive->disk_ops->do_request(drive, rq, sector);
}

163
static struct ide_driver ide_gd_driver = {
164 165
	.gen_driver = {
		.owner		= THIS_MODULE,
166
		.name		= "ide-gd",
167 168 169 170 171 172 173
		.bus		= &ide_bus_type,
	},
	.probe			= ide_gd_probe,
	.remove			= ide_gd_remove,
	.resume			= ide_gd_resume,
	.shutdown		= ide_gd_shutdown,
	.version		= IDE_GD_VERSION,
174
	.do_request		= ide_gd_do_request,
175
#ifdef CONFIG_IDE_PROC_FS
176 177
	.proc_entries		= ide_disk_proc_entries,
	.proc_devsets		= ide_disk_proc_devsets,
178 179 180
#endif
};

Al Viro's avatar
Al Viro committed
181
static int ide_gd_open(struct block_device *bdev, fmode_t mode)
182
{
Al Viro's avatar
Al Viro committed
183
	struct gendisk *disk = bdev->bd_disk;
184 185
	struct ide_disk_obj *idkp;
	ide_drive_t *drive;
186
	int ret = 0;
187 188 189 190 191 192 193

	idkp = ide_disk_get(disk);
	if (idkp == NULL)
		return -ENXIO;

	drive = idkp->drive;

194
	ide_debug_log(IDE_DBG_FUNC, "enter");
195

196 197 198
	idkp->openers++;

	if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
199 200 201 202 203 204 205 206 207 208
		drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
		/* Just in case */

		ret = drive->disk_ops->init_media(drive, disk);

		/*
		 * Allow O_NDELAY to open a drive without a disk, or with an
		 * unreadable disk, so that we can get the format capacity
		 * of the drive or begin the format - Sam
		 */
Al Viro's avatar
Al Viro committed
209
		if (ret && (mode & FMODE_NDELAY) == 0) {
210 211 212 213
			ret = -EIO;
			goto out_put_idkp;
		}

Al Viro's avatar
Al Viro committed
214
		if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
215 216 217 218
			ret = -EROFS;
			goto out_put_idkp;
		}

219 220 221 222 223
		/*
		 * Ignore the return code from door_lock,
		 * since the open() has already succeeded,
		 * and the door_lock is irrelevant at this point.
		 */
224
		drive->disk_ops->set_doorlock(drive, disk, 1);
225
		drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
Al Viro's avatar
Al Viro committed
226
		check_disk_change(bdev);
227 228 229
	} else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
		ret = -EBUSY;
		goto out_put_idkp;
230 231
	}
	return 0;
232 233 234 235 236

out_put_idkp:
	idkp->openers--;
	ide_disk_put(idkp);
	return ret;
237 238
}

Al Viro's avatar
Al Viro committed
239
static int ide_gd_release(struct gendisk *disk, fmode_t mode)
240 241 242 243
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;

244
	ide_debug_log(IDE_DBG_FUNC, "enter");
245

246
	if (idkp->openers == 1)
247
		drive->disk_ops->flush(drive);
248

249 250 251 252
	if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
		drive->disk_ops->set_doorlock(drive, disk, 0);
		drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
	}
253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275

	idkp->openers--;

	ide_disk_put(idkp);

	return 0;
}

static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;

	geo->heads = drive->bios_head;
	geo->sectors = drive->bios_sect;
	geo->cylinders = (u16)drive->bios_cyl; /* truncate */
	return 0;
}

static int ide_gd_media_changed(struct gendisk *disk)
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;
276
	int ret;
277 278 279 280 281 282 283

	/* do not scan partitions twice if this is a removable device */
	if (drive->dev_flags & IDE_DFLAG_ATTACH) {
		drive->dev_flags &= ~IDE_DFLAG_ATTACH;
		return 0;
	}

284 285 286 287
	ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
	drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;

	return ret;
288 289
}

290 291 292 293 294 295 296 297 298 299 300 301 302
static unsigned long long ide_gd_set_capacity(struct gendisk *disk,
					      unsigned long long capacity)
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;
	const struct ide_disk_ops *disk_ops = drive->disk_ops;

	if (disk_ops->set_capacity)
		return disk_ops->set_capacity(drive, capacity);

	return drive->capacity64;
}

303 304 305
static int ide_gd_revalidate_disk(struct gendisk *disk)
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
306 307 308 309 310 311
	ide_drive_t *drive = idkp->drive;

	if (ide_gd_media_changed(disk))
		drive->disk_ops->get_capacity(drive);

	set_capacity(disk, ide_gd_capacity(drive));
312 313 314
	return 0;
}

Al Viro's avatar
Al Viro committed
315
static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
316 317 318 319 320
			     unsigned int cmd, unsigned long arg)
{
	struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;

Al Viro's avatar
Al Viro committed
321
	return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
322 323
}

324
static const struct block_device_operations ide_gd_ops = {
325
	.owner			= THIS_MODULE,
Al Viro's avatar
Al Viro committed
326 327 328
	.open			= ide_gd_open,
	.release		= ide_gd_release,
	.locked_ioctl		= ide_gd_ioctl,
329 330
	.getgeo			= ide_gd_getgeo,
	.media_changed		= ide_gd_media_changed,
331
	.set_capacity		= ide_gd_set_capacity,
332 333 334 335 336
	.revalidate_disk	= ide_gd_revalidate_disk
};

static int ide_gd_probe(ide_drive_t *drive)
{
337
	const struct ide_disk_ops *disk_ops = NULL;
338 339 340 341
	struct ide_disk_obj *idkp;
	struct gendisk *g;

	/* strstr("foo", "") is non-NULL */
342 343 344 345 346 347 348 349 350 351 352 353
	if (!strstr("ide-gd", drive->driver_req))
		goto failed;

#ifdef CONFIG_IDE_GD_ATA
	if (drive->media == ide_disk)
		disk_ops = &ide_ata_disk_ops;
#endif
#ifdef CONFIG_IDE_GD_ATAPI
	if (drive->media == ide_floppy)
		disk_ops = &ide_atapi_disk_ops;
#endif
	if (disk_ops == NULL)
354 355
		goto failed;

356 357 358
	if (disk_ops->check(drive, DRV_NAME) == 0) {
		printk(KERN_ERR PFX "%s: not supported by this driver\n",
			drive->name);
359
		goto failed;
360
	}
361 362

	idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
363 364 365
	if (!idkp) {
		printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
			drive->name);
366
		goto failed;
367
	}
368 369 370 371 372 373 374

	g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
	if (!g)
		goto out_free_idkp;

	ide_init_disk(g, drive);

375 376 377 378 379 380
	idkp->dev.parent = &drive->gendev;
	idkp->dev.release = ide_disk_release;
	dev_set_name(&idkp->dev, dev_name(&drive->gendev));

	if (device_register(&idkp->dev))
		goto out_free_disk;
381 382 383 384 385 386 387 388

	idkp->drive = drive;
	idkp->driver = &ide_gd_driver;
	idkp->disk = g;

	g->private_data = &idkp->driver;

	drive->driver_data = idkp;
389 390
	drive->debug_mask = debug_mask;
	drive->disk_ops = disk_ops;
391

392
	disk_ops->setup(drive);
393 394 395 396 397 398 399 400 401 402 403 404

	set_capacity(g, ide_gd_capacity(drive));

	g->minors = IDE_DISK_MINORS;
	g->driverfs_dev = &drive->gendev;
	g->flags |= GENHD_FL_EXT_DEVT;
	if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
		g->flags = GENHD_FL_REMOVABLE;
	g->fops = &ide_gd_ops;
	add_disk(g);
	return 0;

405 406
out_free_disk:
	put_disk(g);
407 408 409 410 411 412 413 414
out_free_idkp:
	kfree(idkp);
failed:
	return -ENODEV;
}

static int __init ide_gd_init(void)
{
415
	printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
416 417 418 419 420 421 422 423 424 425
	return driver_register(&ide_gd_driver.gen_driver);
}

static void __exit ide_gd_exit(void)
{
	driver_unregister(&ide_gd_driver.gen_driver);
}

MODULE_ALIAS("ide:*m-disk*");
MODULE_ALIAS("ide-disk");
426 427
MODULE_ALIAS("ide:*m-floppy*");
MODULE_ALIAS("ide-floppy");
428 429 430
module_init(ide_gd_init);
module_exit(ide_gd_exit);
MODULE_LICENSE("GPL");
431
MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");