70ea8763567dcc7b1b7fd946275dea49303534f6
[linux-3.10.git] / 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 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
277 static 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
288 static unsigned int ide_gd_check_events(struct gendisk *disk,
289                                         unsigned int clearing)
290 {
291         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
292         ide_drive_t *drive = idkp->drive;
293         bool ret;
294
295         /* do not scan partitions twice if this is a removable device */
296         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
297                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
298                 return 0;
299         }
300
301         /*
302          * The following is used to force revalidation on the first open on
303          * removeable devices, and never gets reported to userland as
304          * genhd->events is 0.  This is intended as removeable ide disk
305          * can't really detect MEDIA_CHANGE events.
306          */
307         ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
308         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
309
310         return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
311 }
312
313 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
314 {
315         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
316         ide_drive_t *drive = idkp->drive;
317         const struct ide_disk_ops *disk_ops = drive->disk_ops;
318
319         if (disk_ops->unlock_native_capacity)
320                 disk_ops->unlock_native_capacity(drive);
321 }
322
323 static int ide_gd_revalidate_disk(struct gendisk *disk)
324 {
325         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
326         ide_drive_t *drive = idkp->drive;
327
328         if (ide_gd_check_events(disk, 0))
329                 drive->disk_ops->get_capacity(drive);
330
331         set_capacity(disk, ide_gd_capacity(drive));
332         return 0;
333 }
334
335 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
336                              unsigned int cmd, unsigned long arg)
337 {
338         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
339         ide_drive_t *drive = idkp->drive;
340
341         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
342 }
343
344 static const struct block_device_operations ide_gd_ops = {
345         .owner                  = THIS_MODULE,
346         .open                   = ide_gd_unlocked_open,
347         .release                = ide_gd_release,
348         .ioctl                  = ide_gd_ioctl,
349         .getgeo                 = ide_gd_getgeo,
350         .check_events           = ide_gd_check_events,
351         .unlock_native_capacity = ide_gd_unlock_native_capacity,
352         .revalidate_disk        = ide_gd_revalidate_disk
353 };
354
355 static int ide_gd_probe(ide_drive_t *drive)
356 {
357         const struct ide_disk_ops *disk_ops = NULL;
358         struct ide_disk_obj *idkp;
359         struct gendisk *g;
360
361         /* strstr("foo", "") is non-NULL */
362         if (!strstr("ide-gd", drive->driver_req))
363                 goto failed;
364
365 #ifdef CONFIG_IDE_GD_ATA
366         if (drive->media == ide_disk)
367                 disk_ops = &ide_ata_disk_ops;
368 #endif
369 #ifdef CONFIG_IDE_GD_ATAPI
370         if (drive->media == ide_floppy)
371                 disk_ops = &ide_atapi_disk_ops;
372 #endif
373         if (disk_ops == NULL)
374                 goto failed;
375
376         if (disk_ops->check(drive, DRV_NAME) == 0) {
377                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
378                         drive->name);
379                 goto failed;
380         }
381
382         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
383         if (!idkp) {
384                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
385                         drive->name);
386                 goto failed;
387         }
388
389         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
390         if (!g)
391                 goto out_free_idkp;
392
393         ide_init_disk(g, drive);
394
395         idkp->dev.parent = &drive->gendev;
396         idkp->dev.release = ide_disk_release;
397         dev_set_name(&idkp->dev, dev_name(&drive->gendev));
398
399         if (device_register(&idkp->dev))
400                 goto out_free_disk;
401
402         idkp->drive = drive;
403         idkp->driver = &ide_gd_driver;
404         idkp->disk = g;
405
406         g->private_data = &idkp->driver;
407
408         drive->driver_data = idkp;
409         drive->debug_mask = debug_mask;
410         drive->disk_ops = disk_ops;
411
412         disk_ops->setup(drive);
413
414         set_capacity(g, ide_gd_capacity(drive));
415
416         g->minors = IDE_DISK_MINORS;
417         g->driverfs_dev = &drive->gendev;
418         g->flags |= GENHD_FL_EXT_DEVT;
419         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
420                 g->flags = GENHD_FL_REMOVABLE;
421         g->fops = &ide_gd_ops;
422         add_disk(g);
423         return 0;
424
425 out_free_disk:
426         put_disk(g);
427 out_free_idkp:
428         kfree(idkp);
429 failed:
430         return -ENODEV;
431 }
432
433 static int __init ide_gd_init(void)
434 {
435         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
436         return driver_register(&ide_gd_driver.gen_driver);
437 }
438
439 static void __exit ide_gd_exit(void)
440 {
441         driver_unregister(&ide_gd_driver.gen_driver);
442 }
443
444 MODULE_ALIAS("ide:*m-disk*");
445 MODULE_ALIAS("ide-disk");
446 MODULE_ALIAS("ide:*m-floppy*");
447 MODULE_ALIAS("ide-floppy");
448 module_init(ide_gd_init);
449 module_exit(ide_gd_exit);
450 MODULE_LICENSE("GPL");
451 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");