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
#include <linux/slab.h>
12 13 14 15 16 17 18 19

#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"
20
#include "ide-floppy.h"
21 22 23

#define IDE_GD_VERSION	"1.18"

24 25 26 27
/* module parameters */
static unsigned long debug_mask;
module_param(debug_mask, ulong, 0644);

28 29
static DEFINE_MUTEX(ide_disk_ref_mutex);

30
static void ide_disk_release(struct device *);
31 32 33 34 35 36 37 38 39 40 41

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
42
			get_device(&idkp->dev);
43 44 45 46 47 48 49 50 51 52
	}
	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);
53
	put_device(&idkp->dev);
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
	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);
71
	device_del(&idkp->dev);
72
	del_gendisk(g);
73
	drive->disk_ops->flush(drive);
74

75 76 77
	mutex_lock(&ide_disk_ref_mutex);
	put_device(&idkp->dev);
	mutex_unlock(&ide_disk_ref_mutex);
78 79
}

80
static void ide_disk_release(struct device *dev)
81
{
82
	struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
83 84 85
	ide_drive_t *drive = idkp->drive;
	struct gendisk *g = idkp->disk;

86
	drive->disk_ops = NULL;
87 88 89 90 91 92 93 94 95 96 97 98 99 100
	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))
101
		(void)drive->disk_ops->get_capacity(drive);
102 103
}

104 105 106 107 108 109 110 111 112 113 114 115 116
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 */
};

117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
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
133 134
	if (system_state == SYSTEM_RESTART &&
		!dmi_check_system(ide_coldreboot_table)) {
135
#endif
136
		drive->disk_ops->flush(drive);
137 138 139 140 141 142 143 144
		return;
	}

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

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

145 146 147
#ifdef CONFIG_IDE_PROC_FS
static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
{
148
	return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
149 150 151 152
}

static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
{
153 154
	return (drive->media == ide_disk) ? ide_disk_settings
					  : ide_floppy_settings;
155 156 157
}
#endif

158 159 160 161 162 163
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);
}

164
static struct ide_driver ide_gd_driver = {
165 166
	.gen_driver = {
		.owner		= THIS_MODULE,
167
		.name		= "ide-gd",
168 169 170 171 172 173 174
		.bus		= &ide_bus_type,
	},
	.probe			= ide_gd_probe,
	.remove			= ide_gd_remove,
	.resume			= ide_gd_resume,
	.shutdown		= ide_gd_shutdown,
	.version		= IDE_GD_VERSION,
175
	.do_request		= ide_gd_do_request,
176
#ifdef CONFIG_IDE_PROC_FS
177 178
	.proc_entries		= ide_disk_proc_entries,
	.proc_devsets		= ide_disk_proc_devsets,
179 180 181
#endif
};

Al Viro's avatar
Al Viro committed
182
static int ide_gd_open(struct block_device *bdev, fmode_t mode)
183
{
Al Viro's avatar
Al Viro committed
184
	struct gendisk *disk = bdev->bd_disk;
185 186
	struct ide_disk_obj *idkp;
	ide_drive_t *drive;
187
	int ret = 0;
188 189 190 191 192 193 194

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

	drive = idkp->drive;

195
	ide_debug_log(IDE_DBG_FUNC, "enter");
196

197 198 199
	idkp->openers++;

	if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
200 201 202 203 204 205 206 207 208 209
		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
210
		if (ret && (mode & FMODE_NDELAY) == 0) {
211 212 213 214
			ret = -EIO;
			goto out_put_idkp;
		}

Al Viro's avatar
Al Viro committed
215
		if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
216 217 218 219
			ret = -EROFS;
			goto out_put_idkp;
		}

220 221 222 223 224
		/*
		 * Ignore the return code from door_lock,
		 * since the open() has already succeeded,
		 * and the door_lock is irrelevant at this point.
		 */
225
		drive->disk_ops->set_doorlock(drive, disk, 1);
226
		drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
Al Viro's avatar
Al Viro committed
227
		check_disk_change(bdev);
228 229 230
	} else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
		ret = -EBUSY;
		goto out_put_idkp;
231 232
	}
	return 0;
233 234 235 236 237

out_put_idkp:
	idkp->openers--;
	ide_disk_put(idkp);
	return ret;
238 239
}

Al Viro's avatar
Al Viro committed
240
static int ide_gd_release(struct gendisk *disk, fmode_t mode)
241 242 243 244
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
	ide_drive_t *drive = idkp->drive;

245
	ide_debug_log(IDE_DBG_FUNC, "enter");
246

247
	if (idkp->openers == 1)
248
		drive->disk_ops->flush(drive);
249

250 251 252 253
	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;
	}
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276

	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;
277
	int ret;
278 279 280 281 282 283 284

	/* 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;
	}

285 286 287 288
	ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
	drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;

	return ret;
289 290
}

291
static void ide_gd_unlock_native_capacity(struct gendisk *disk)
292 293 294 295 296
{
	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;

297 298
	if (disk_ops->unlock_native_capacity)
		disk_ops->unlock_native_capacity(drive);
299 300
}

301 302 303
static int ide_gd_revalidate_disk(struct gendisk *disk)
{
	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
304 305 306 307 308 309
	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));
310 311 312
	return 0;
}

Al Viro's avatar
Al Viro committed
313
static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
314 315 316 317 318
			     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
319
	return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
320 321
}

322
static const struct block_device_operations ide_gd_ops = {
323
	.owner			= THIS_MODULE,
Al Viro's avatar
Al Viro committed
324 325 326
	.open			= ide_gd_open,
	.release		= ide_gd_release,
	.locked_ioctl		= ide_gd_ioctl,
327 328
	.getgeo			= ide_gd_getgeo,
	.media_changed		= ide_gd_media_changed,
329
	.unlock_native_capacity	= ide_gd_unlock_native_capacity,
330 331 332 333 334
	.revalidate_disk	= ide_gd_revalidate_disk
};

static int ide_gd_probe(ide_drive_t *drive)
{
335
	const struct ide_disk_ops *disk_ops = NULL;
336 337 338 339
	struct ide_disk_obj *idkp;
	struct gendisk *g;

	/* strstr("foo", "") is non-NULL */
340 341 342 343 344 345 346 347 348 349 350 351
	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)
352 353
		goto failed;

354 355 356
	if (disk_ops->check(drive, DRV_NAME) == 0) {
		printk(KERN_ERR PFX "%s: not supported by this driver\n",
			drive->name);
357
		goto failed;
358
	}
359 360

	idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
361 362 363
	if (!idkp) {
		printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
			drive->name);
364
		goto failed;
365
	}
366 367 368 369 370 371 372

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

	ide_init_disk(g, drive);

373 374 375 376 377 378
	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;
379 380 381 382 383 384 385 386

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

	g->private_data = &idkp->driver;

	drive->driver_data = idkp;
387 388
	drive->debug_mask = debug_mask;
	drive->disk_ops = disk_ops;
389

390
	disk_ops->setup(drive);
391 392 393 394 395 396 397 398 399 400 401 402

	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;

403 404
out_free_disk:
	put_disk(g);
405 406 407 408 409 410 411 412
out_free_idkp:
	kfree(idkp);
failed:
	return -ENODEV;
}

static int __init ide_gd_init(void)
{
413
	printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
414 415 416 417 418 419 420 421 422 423
	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");
424 425
MODULE_ALIAS("ide:*m-floppy*");
MODULE_ALIAS("ide-floppy");
426 427 428
module_init(ide_gd_init);
module_exit(ide_gd_exit);
MODULE_LICENSE("GPL");
429
MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");