ide-gd.c revision 2a48fc0ab24241755dc93bfd4f01d68efab47f5a 
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 */
25static DEFINE_MUTEX(ide_gd_mutex);
26static unsigned long debug_mask;
27module_param(debug_mask, ulong, 0644);
28
29static DEFINE_MUTEX(ide_disk_ref_mutex);
30
31static void ide_disk_release(struct device *);
32
33static 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
49static 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
59sector_t ide_gd_capacity(ide_drive_t *drive)
60{
61	return drive->capacity64;
62}
63
64static int ide_gd_probe(ide_drive_t *);
65
66static 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
81static 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 */
99static 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
105static 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
118static 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
147static 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
152static 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
159static 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
165static 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
183static 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
235out_put_idkp:
236	idkp->openers--;
237	ide_disk_put(idkp);
238	return ret;
239}
240
241static 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
253static 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
277static 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
288static int ide_gd_media_changed(struct gendisk *disk)
289{
290	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
291	ide_drive_t *drive = idkp->drive;
292	int ret;
293
294	/* do not scan partitions twice if this is a removable device */
295	if (drive->dev_flags & IDE_DFLAG_ATTACH) {
296		drive->dev_flags &= ~IDE_DFLAG_ATTACH;
297		return 0;
298	}
299
300	ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
301	drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
302
303	return ret;
304}
305
306static void ide_gd_unlock_native_capacity(struct gendisk *disk)
307{
308	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
309	ide_drive_t *drive = idkp->drive;
310	const struct ide_disk_ops *disk_ops = drive->disk_ops;
311
312	if (disk_ops->unlock_native_capacity)
313		disk_ops->unlock_native_capacity(drive);
314}
315
316static int ide_gd_revalidate_disk(struct gendisk *disk)
317{
318	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
319	ide_drive_t *drive = idkp->drive;
320
321	if (ide_gd_media_changed(disk))
322		drive->disk_ops->get_capacity(drive);
323
324	set_capacity(disk, ide_gd_capacity(drive));
325	return 0;
326}
327
328static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
329			     unsigned int cmd, unsigned long arg)
330{
331	struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
332	ide_drive_t *drive = idkp->drive;
333
334	return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
335}
336
337static const struct block_device_operations ide_gd_ops = {
338	.owner			= THIS_MODULE,
339	.open			= ide_gd_unlocked_open,
340	.release		= ide_gd_release,
341	.ioctl			= ide_gd_ioctl,
342	.getgeo			= ide_gd_getgeo,
343	.media_changed		= ide_gd_media_changed,
344	.unlock_native_capacity	= ide_gd_unlock_native_capacity,
345	.revalidate_disk	= ide_gd_revalidate_disk
346};
347
348static int ide_gd_probe(ide_drive_t *drive)
349{
350	const struct ide_disk_ops *disk_ops = NULL;
351	struct ide_disk_obj *idkp;
352	struct gendisk *g;
353
354	/* strstr("foo", "") is non-NULL */
355	if (!strstr("ide-gd", drive->driver_req))
356		goto failed;
357
358#ifdef CONFIG_IDE_GD_ATA
359	if (drive->media == ide_disk)
360		disk_ops = &ide_ata_disk_ops;
361#endif
362#ifdef CONFIG_IDE_GD_ATAPI
363	if (drive->media == ide_floppy)
364		disk_ops = &ide_atapi_disk_ops;
365#endif
366	if (disk_ops == NULL)
367		goto failed;
368
369	if (disk_ops->check(drive, DRV_NAME) == 0) {
370		printk(KERN_ERR PFX "%s: not supported by this driver\n",
371			drive->name);
372		goto failed;
373	}
374
375	idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
376	if (!idkp) {
377		printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
378			drive->name);
379		goto failed;
380	}
381
382	g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
383	if (!g)
384		goto out_free_idkp;
385
386	ide_init_disk(g, drive);
387
388	idkp->dev.parent = &drive->gendev;
389	idkp->dev.release = ide_disk_release;
390	dev_set_name(&idkp->dev, dev_name(&drive->gendev));
391
392	if (device_register(&idkp->dev))
393		goto out_free_disk;
394
395	idkp->drive = drive;
396	idkp->driver = &ide_gd_driver;
397	idkp->disk = g;
398
399	g->private_data = &idkp->driver;
400
401	drive->driver_data = idkp;
402	drive->debug_mask = debug_mask;
403	drive->disk_ops = disk_ops;
404
405	disk_ops->setup(drive);
406
407	set_capacity(g, ide_gd_capacity(drive));
408
409	g->minors = IDE_DISK_MINORS;
410	g->driverfs_dev = &drive->gendev;
411	g->flags |= GENHD_FL_EXT_DEVT;
412	if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
413		g->flags = GENHD_FL_REMOVABLE;
414	g->fops = &ide_gd_ops;
415	add_disk(g);
416	return 0;
417
418out_free_disk:
419	put_disk(g);
420out_free_idkp:
421	kfree(idkp);
422failed:
423	return -ENODEV;
424}
425
426static int __init ide_gd_init(void)
427{
428	printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
429	return driver_register(&ide_gd_driver.gen_driver);
430}
431
432static void __exit ide_gd_exit(void)
433{
434	driver_unregister(&ide_gd_driver.gen_driver);
435}
436
437MODULE_ALIAS("ide:*m-disk*");
438MODULE_ALIAS("ide-disk");
439MODULE_ALIAS("ide:*m-floppy*");
440MODULE_ALIAS("ide-floppy");
441module_init(ide_gd_init);
442module_exit(ide_gd_exit);
443MODULE_LICENSE("GPL");
444MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");
445