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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/module.h>
3#include <linux/types.h>
4#include <linux/string.h>
5#include <linux/kernel.h>
6#include <linux/errno.h>
7#include <linux/genhd.h>
8#include <linux/mutex.h>
9#include <linux/ide.h>
10#include <linux/hdreg.h>
11#include <linux/dmi.h>
12#include <linux/slab.h>
13
14#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
15#define IDE_DISK_MINORS (1 << PARTN_BITS)
16#else
17#define IDE_DISK_MINORS 0
18#endif
19
20#include "ide-disk.h"
21#include "ide-floppy.h"
22
23#define IDE_GD_VERSION "1.18"
24
25/* module parameters */
26static DEFINE_MUTEX(ide_gd_mutex);
27static unsigned long debug_mask;
28module_param(debug_mask, ulong, 0644);
29
30static DEFINE_MUTEX(ide_disk_ref_mutex);
31
32static void ide_disk_release(struct device *);
33
34static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
35{
36 struct ide_disk_obj *idkp = NULL;
37
38 mutex_lock(&ide_disk_ref_mutex);
39 idkp = ide_drv_g(disk, ide_disk_obj);
40 if (idkp) {
41 if (ide_device_get(idkp->drive))
42 idkp = NULL;
43 else
44 get_device(&idkp->dev);
45 }
46 mutex_unlock(&ide_disk_ref_mutex);
47 return idkp;
48}
49
50static void ide_disk_put(struct ide_disk_obj *idkp)
51{
52 ide_drive_t *drive = idkp->drive;
53
54 mutex_lock(&ide_disk_ref_mutex);
55 put_device(&idkp->dev);
56 ide_device_put(drive);
57 mutex_unlock(&ide_disk_ref_mutex);
58}
59
60sector_t ide_gd_capacity(ide_drive_t *drive)
61{
62 return drive->capacity64;
63}
64
65static int ide_gd_probe(ide_drive_t *);
66
67static void ide_gd_remove(ide_drive_t *drive)
68{
69 struct ide_disk_obj *idkp = drive->driver_data;
70 struct gendisk *g = idkp->disk;
71
72 ide_proc_unregister_driver(drive, idkp->driver);
73 device_del(&idkp->dev);
74 del_gendisk(g);
75 drive->disk_ops->flush(drive);
76
77 mutex_lock(&ide_disk_ref_mutex);
78 put_device(&idkp->dev);
79 mutex_unlock(&ide_disk_ref_mutex);
80}
81
82static void ide_disk_release(struct device *dev)
83{
84 struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
85 ide_drive_t *drive = idkp->drive;
86 struct gendisk *g = idkp->disk;
87
88 drive->disk_ops = NULL;
89 drive->driver_data = NULL;
90 g->private_data = NULL;
91 put_disk(g);
92 kfree(idkp);
93}
94
95/*
96 * On HPA drives the capacity needs to be
97 * reinitialized on resume otherwise the disk
98 * can not be used and a hard reset is required
99 */
100static void ide_gd_resume(ide_drive_t *drive)
101{
102 if (ata_id_hpa_enabled(drive->id))
103 (void)drive->disk_ops->get_capacity(drive);
104}
105
106static const struct dmi_system_id ide_coldreboot_table[] = {
107 {
108 /* Acer TravelMate 66x cuts power during reboot */
109 .ident = "Acer TravelMate 660",
110 .matches = {
111 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
112 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
113 },
114 },
115
116 { } /* terminate list */
117};
118
119static void ide_gd_shutdown(ide_drive_t *drive)
120{
121#ifdef CONFIG_ALPHA
122 /* On Alpha, halt(8) doesn't actually turn the machine off,
123 it puts you into the sort of firmware monitor. Typically,
124 it's used to boot another kernel image, so it's not much
125 different from reboot(8). Therefore, we don't need to
126 spin down the disk in this case, especially since Alpha
127 firmware doesn't handle disks in standby mode properly.
128 On the other hand, it's reasonably safe to turn the power
129 off when the shutdown process reaches the firmware prompt,
130 as the firmware initialization takes rather long time -
131 at least 10 seconds, which should be sufficient for
132 the disk to expire its write cache. */
133 if (system_state != SYSTEM_POWER_OFF) {
134#else
135 if (system_state == SYSTEM_RESTART &&
136 !dmi_check_system(ide_coldreboot_table)) {
137#endif
138 drive->disk_ops->flush(drive);
139 return;
140 }
141
142 printk(KERN_INFO "Shutdown: %s\n", drive->name);
143
144 drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
145}
146
147#ifdef CONFIG_IDE_PROC_FS
148static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
149{
150 return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
151}
152
153static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
154{
155 return (drive->media == ide_disk) ? ide_disk_settings
156 : ide_floppy_settings;
157}
158#endif
159
160static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
161 struct request *rq, sector_t sector)
162{
163 return drive->disk_ops->do_request(drive, rq, sector);
164}
165
166static struct ide_driver ide_gd_driver = {
167 .gen_driver = {
168 .owner = THIS_MODULE,
169 .name = "ide-gd",
170 .bus = &ide_bus_type,
171 },
172 .probe = ide_gd_probe,
173 .remove = ide_gd_remove,
174 .resume = ide_gd_resume,
175 .shutdown = ide_gd_shutdown,
176 .version = IDE_GD_VERSION,
177 .do_request = ide_gd_do_request,
178#ifdef CONFIG_IDE_PROC_FS
179 .proc_entries = ide_disk_proc_entries,
180 .proc_devsets = ide_disk_proc_devsets,
181#endif
182};
183
184static int ide_gd_open(struct block_device *bdev, fmode_t mode)
185{
186 struct gendisk *disk = bdev->bd_disk;
187 struct ide_disk_obj *idkp;
188 ide_drive_t *drive;
189 int ret = 0;
190
191 idkp = ide_disk_get(disk);
192 if (idkp == NULL)
193 return -ENXIO;
194
195 drive = idkp->drive;
196
197 ide_debug_log(IDE_DBG_FUNC, "enter");
198
199 idkp->openers++;
200
201 if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
202 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
203 /* Just in case */
204
205 ret = drive->disk_ops->init_media(drive, disk);
206
207 /*
208 * Allow O_NDELAY to open a drive without a disk, or with an
209 * unreadable disk, so that we can get the format capacity
210 * of the drive or begin the format - Sam
211 */
212 if (ret && (mode & FMODE_NDELAY) == 0) {
213 ret = -EIO;
214 goto out_put_idkp;
215 }
216
217 if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
218 ret = -EROFS;
219 goto out_put_idkp;
220 }
221
222 /*
223 * Ignore the return code from door_lock,
224 * since the open() has already succeeded,
225 * and the door_lock is irrelevant at this point.
226 */
227 drive->disk_ops->set_doorlock(drive, disk, 1);
228 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
229 check_disk_change(bdev);
230 } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
231 ret = -EBUSY;
232 goto out_put_idkp;
233 }
234 return 0;
235
236out_put_idkp:
237 idkp->openers--;
238 ide_disk_put(idkp);
239 return ret;
240}
241
242static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
243{
244 int ret;
245
246 mutex_lock(&ide_gd_mutex);
247 ret = ide_gd_open(bdev, mode);
248 mutex_unlock(&ide_gd_mutex);
249
250 return ret;
251}
252
253
254static void ide_gd_release(struct gendisk *disk, fmode_t mode)
255{
256 struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
257 ide_drive_t *drive = idkp->drive;
258
259 ide_debug_log(IDE_DBG_FUNC, "enter");
260
261 mutex_lock(&ide_gd_mutex);
262 if (idkp->openers == 1)
263 drive->disk_ops->flush(drive);
264
265 if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
266 drive->disk_ops->set_doorlock(drive, disk, 0);
267 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
268 }
269
270 idkp->openers--;
271
272 ide_disk_put(idkp);
273 mutex_unlock(&ide_gd_mutex);
274}
275
276static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
277{
278 struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
279 ide_drive_t *drive = idkp->drive;
280
281 geo->heads = drive->bios_head;
282 geo->sectors = drive->bios_sect;
283 geo->cylinders = (u16)drive->bios_cyl; /* truncate */
284 return 0;
285}
286
287static unsigned int ide_gd_check_events(struct gendisk *disk,
288 unsigned int clearing)
289{
290 struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
291 ide_drive_t *drive = idkp->drive;
292 bool 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 /*
301 * The following is used to force revalidation on the first open on
302 * removeable devices, and never gets reported to userland as
303 * DISK_EVENT_FLAG_UEVENT isn't set in genhd->event_flags.
304 * This is intended as removable ide disk can't really detect
305 * 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
313static 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
323static 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
335static 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
344static 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
355static 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, "%s", 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->flags |= GENHD_FL_EXT_DEVT;
418 if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
419 g->flags = GENHD_FL_REMOVABLE;
420 g->fops = &ide_gd_ops;
421 g->events = DISK_EVENT_MEDIA_CHANGE;
422 device_add_disk(&drive->gendev, g, NULL);
423 return 0;
424
425out_free_disk:
426 put_disk(g);
427out_free_idkp:
428 kfree(idkp);
429failed:
430 return -ENODEV;
431}
432
433static 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
439static void __exit ide_gd_exit(void)
440{
441 driver_unregister(&ide_gd_driver.gen_driver);
442}
443
444MODULE_ALIAS("ide:*m-disk*");
445MODULE_ALIAS("ide-disk");
446MODULE_ALIAS("ide:*m-floppy*");
447MODULE_ALIAS("ide-floppy");
448module_init(ide_gd_init);
449module_exit(ide_gd_exit);
450MODULE_LICENSE("GPL");
451MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");