[PATCH] fix IDE deadlock in error reporting code
[linux-2.6] / drivers / ide / ide-proc.c
1 /*
2  *  linux/drivers/ide/ide-proc.c        Version 1.05    Mar 05, 2003
3  *
4  *  Copyright (C) 1997-1998     Mark Lord
5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
6  */
7
8 /*
9  * This is the /proc/ide/ filesystem implementation.
10  *
11  * Drive/Driver settings can be retrieved by reading the drive's
12  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
13  * To write a new value "val" into a specific setting "name", use:
14  *   echo "name:val" >/proc/ide/ide0/hda/settings
15  *
16  * Also useful, "cat /proc/ide0/hda/[identify, smart_values,
17  * smart_thresholds, capabilities]" will issue an IDENTIFY /
18  * PACKET_IDENTIFY / SMART_READ_VALUES / SMART_READ_THRESHOLDS /
19  * SENSE CAPABILITIES command to /dev/hda, and then dump out the
20  * returned data as 256 16-bit words.  The "hdparm" utility will
21  * be updated someday soon to use this mechanism.
22  *
23  */
24
25 #include <linux/config.h>
26 #include <linux/module.h>
27
28 #include <asm/uaccess.h>
29 #include <linux/errno.h>
30 #include <linux/sched.h>
31 #include <linux/proc_fs.h>
32 #include <linux/stat.h>
33 #include <linux/mm.h>
34 #include <linux/pci.h>
35 #include <linux/ctype.h>
36 #include <linux/hdreg.h>
37 #include <linux/ide.h>
38 #include <linux/seq_file.h>
39
40 #include <asm/io.h>
41
42 static int proc_ide_read_imodel
43         (char *page, char **start, off_t off, int count, int *eof, void *data)
44 {
45         ide_hwif_t      *hwif = (ide_hwif_t *) data;
46         int             len;
47         const char      *name;
48
49         /*
50          * Neither ide_unknown nor ide_forced should be set at this point.
51          */
52         switch (hwif->chipset) {
53                 case ide_generic:       name = "generic";       break;
54                 case ide_pci:           name = "pci";           break;
55                 case ide_cmd640:        name = "cmd640";        break;
56                 case ide_dtc2278:       name = "dtc2278";       break;
57                 case ide_ali14xx:       name = "ali14xx";       break;
58                 case ide_qd65xx:        name = "qd65xx";        break;
59                 case ide_umc8672:       name = "umc8672";       break;
60                 case ide_ht6560b:       name = "ht6560b";       break;
61                 case ide_rz1000:        name = "rz1000";        break;
62                 case ide_trm290:        name = "trm290";        break;
63                 case ide_cmd646:        name = "cmd646";        break;
64                 case ide_cy82c693:      name = "cy82c693";      break;
65                 case ide_4drives:       name = "4drives";       break;
66                 case ide_pmac:          name = "mac-io";        break;
67                 case ide_au1xxx:        name = "au1xxx";        break;
68                 default:                name = "(unknown)";     break;
69         }
70         len = sprintf(page, "%s\n", name);
71         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
72 }
73
74 static int proc_ide_read_mate
75         (char *page, char **start, off_t off, int count, int *eof, void *data)
76 {
77         ide_hwif_t      *hwif = (ide_hwif_t *) data;
78         int             len;
79
80         if (hwif && hwif->mate && hwif->mate->present)
81                 len = sprintf(page, "%s\n", hwif->mate->name);
82         else
83                 len = sprintf(page, "(none)\n");
84         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
85 }
86
87 static int proc_ide_read_channel
88         (char *page, char **start, off_t off, int count, int *eof, void *data)
89 {
90         ide_hwif_t      *hwif = (ide_hwif_t *) data;
91         int             len;
92
93         page[0] = hwif->channel ? '1' : '0';
94         page[1] = '\n';
95         len = 2;
96         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
97 }
98
99 static int proc_ide_read_identify
100         (char *page, char **start, off_t off, int count, int *eof, void *data)
101 {
102         ide_drive_t     *drive = (ide_drive_t *)data;
103         int             len = 0, i = 0;
104         int             err = 0;
105
106         len = sprintf(page, "\n");
107
108         if (drive) {
109                 unsigned short *val = (unsigned short *) page;
110
111                 err = taskfile_lib_get_identify(drive, page);
112                 if (!err) {
113                         char *out = ((char *)page) + (SECTOR_WORDS * 4);
114                         page = out;
115                         do {
116                                 out += sprintf(out, "%04x%c",
117                                         le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
118                                 val += 1;
119                         } while (i < (SECTOR_WORDS * 2));
120                         len = out - page;
121                 }
122         }
123         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
124 }
125
126 static void proc_ide_settings_warn(void)
127 {
128         static int warned = 0;
129
130         if (warned)
131                 return;
132
133         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
134                             "obsolete, and will be removed soon!\n");
135         warned = 1;
136 }
137
138 static int proc_ide_read_settings
139         (char *page, char **start, off_t off, int count, int *eof, void *data)
140 {
141         ide_drive_t     *drive = (ide_drive_t *) data;
142         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
143         char            *out = page;
144         int             len, rc, mul_factor, div_factor;
145
146         proc_ide_settings_warn();
147
148         down(&ide_setting_sem);
149         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
150         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
151         while(setting) {
152                 mul_factor = setting->mul_factor;
153                 div_factor = setting->div_factor;
154                 out += sprintf(out, "%-24s", setting->name);
155                 if ((rc = ide_read_setting(drive, setting)) >= 0)
156                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
157                 else
158                         out += sprintf(out, "%-16s", "write-only");
159                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
160                 if (setting->rw & SETTING_READ)
161                         out += sprintf(out, "r");
162                 if (setting->rw & SETTING_WRITE)
163                         out += sprintf(out, "w");
164                 out += sprintf(out, "\n");
165                 setting = setting->next;
166         }
167         len = out - page;
168         up(&ide_setting_sem);
169         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
170 }
171
172 #define MAX_LEN 30
173
174 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
175                                    unsigned long count, void *data)
176 {
177         ide_drive_t     *drive = (ide_drive_t *) data;
178         char            name[MAX_LEN + 1];
179         int             for_real = 0;
180         unsigned long   n;
181         ide_settings_t  *setting;
182         char *buf, *s;
183
184         if (!capable(CAP_SYS_ADMIN))
185                 return -EACCES;
186
187         proc_ide_settings_warn();
188
189         if (count >= PAGE_SIZE)
190                 return -EINVAL;
191
192         s = buf = (char *)__get_free_page(GFP_USER);
193         if (!buf)
194                 return -ENOMEM;
195
196         if (copy_from_user(buf, buffer, count)) {
197                 free_page((unsigned long)buf);
198                 return -EFAULT;
199         }
200
201         buf[count] = '\0';
202
203         /*
204          * Skip over leading whitespace
205          */
206         while (count && isspace(*s)) {
207                 --count;
208                 ++s;
209         }
210         /*
211          * Do one full pass to verify all parameters,
212          * then do another to actually write the new settings.
213          */
214         do {
215                 char *p = s;
216                 n = count;
217                 while (n > 0) {
218                         unsigned val;
219                         char *q = p;
220
221                         while (n > 0 && *p != ':') {
222                                 --n;
223                                 p++;
224                         }
225                         if (*p != ':')
226                                 goto parse_error;
227                         if (p - q > MAX_LEN)
228                                 goto parse_error;
229                         memcpy(name, q, p - q);
230                         name[p - q] = 0;
231
232                         if (n > 0) {
233                                 --n;
234                                 p++;
235                         } else
236                                 goto parse_error;
237
238                         val = simple_strtoul(p, &q, 10);
239                         n -= q - p;
240                         p = q;
241                         if (n > 0 && !isspace(*p))
242                                 goto parse_error;
243                         while (n > 0 && isspace(*p)) {
244                                 --n;
245                                 ++p;
246                         }
247
248                         down(&ide_setting_sem);
249                         setting = ide_find_setting_by_name(drive, name);
250                         if (!setting)
251                         {
252                                 up(&ide_setting_sem);
253                                 goto parse_error;
254                         }
255                         if (for_real)
256                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
257                         up(&ide_setting_sem);
258                 }
259         } while (!for_real++);
260         free_page((unsigned long)buf);
261         return count;
262 parse_error:
263         free_page((unsigned long)buf);
264         printk("proc_ide_write_settings(): parse error\n");
265         return -EINVAL;
266 }
267
268 int proc_ide_read_capacity
269         (char *page, char **start, off_t off, int count, int *eof, void *data)
270 {
271         int len = sprintf(page,"%llu\n", (long long)0x7fffffff);
272         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
273 }
274
275 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
276
277 int proc_ide_read_geometry
278         (char *page, char **start, off_t off, int count, int *eof, void *data)
279 {
280         ide_drive_t     *drive = (ide_drive_t *) data;
281         char            *out = page;
282         int             len;
283
284         out += sprintf(out,"physical     %d/%d/%d\n",
285                         drive->cyl, drive->head, drive->sect);
286         out += sprintf(out,"logical      %d/%d/%d\n",
287                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
288
289         len = out - page;
290         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
291 }
292
293 EXPORT_SYMBOL(proc_ide_read_geometry);
294
295 static int proc_ide_read_dmodel
296         (char *page, char **start, off_t off, int count, int *eof, void *data)
297 {
298         ide_drive_t     *drive = (ide_drive_t *) data;
299         struct hd_driveid *id = drive->id;
300         int             len;
301
302         len = sprintf(page, "%.40s\n",
303                 (id && id->model[0]) ? (char *)id->model : "(none)");
304         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
305 }
306
307 static int proc_ide_read_driver
308         (char *page, char **start, off_t off, int count, int *eof, void *data)
309 {
310         ide_drive_t     *drive = (ide_drive_t *) data;
311         struct device   *dev = &drive->gendev;
312         ide_driver_t    *ide_drv;
313         int             len;
314
315         down_read(&dev->bus->subsys.rwsem);
316         if (dev->driver) {
317                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
318                 len = sprintf(page, "%s version %s\n",
319                                 dev->driver->name, ide_drv->version);
320         } else
321                 len = sprintf(page, "ide-default version 0.9.newide\n");
322         up_read(&dev->bus->subsys.rwsem);
323         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
324 }
325
326 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
327 {
328         struct device *dev = &drive->gendev;
329         int ret = 1;
330
331         down_write(&dev->bus->subsys.rwsem);
332         device_release_driver(dev);
333         /* FIXME: device can still be in use by previous driver */
334         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
335         device_attach(dev);
336         drive->driver_req[0] = 0;
337         if (dev->driver == NULL)
338                 device_attach(dev);
339         if (dev->driver && !strcmp(dev->driver->name, driver))
340                 ret = 0;
341         up_write(&dev->bus->subsys.rwsem);
342
343         return ret;
344 }
345
346 static int proc_ide_write_driver
347         (struct file *file, const char __user *buffer, unsigned long count, void *data)
348 {
349         ide_drive_t     *drive = (ide_drive_t *) data;
350         char name[32];
351
352         if (!capable(CAP_SYS_ADMIN))
353                 return -EACCES;
354         if (count > 31)
355                 count = 31;
356         if (copy_from_user(name, buffer, count))
357                 return -EFAULT;
358         name[count] = '\0';
359         if (ide_replace_subdriver(drive, name))
360                 return -EINVAL;
361         return count;
362 }
363
364 static int proc_ide_read_media
365         (char *page, char **start, off_t off, int count, int *eof, void *data)
366 {
367         ide_drive_t     *drive = (ide_drive_t *) data;
368         const char      *media;
369         int             len;
370
371         switch (drive->media) {
372                 case ide_disk:  media = "disk\n";
373                                 break;
374                 case ide_cdrom: media = "cdrom\n";
375                                 break;
376                 case ide_tape:  media = "tape\n";
377                                 break;
378                 case ide_floppy:media = "floppy\n";
379                                 break;
380                 default:        media = "UNKNOWN\n";
381                                 break;
382         }
383         strcpy(page,media);
384         len = strlen(media);
385         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
386 }
387
388 static ide_proc_entry_t generic_drive_entries[] = {
389         { "driver",     S_IFREG|S_IRUGO,        proc_ide_read_driver,   proc_ide_write_driver },
390         { "identify",   S_IFREG|S_IRUSR,        proc_ide_read_identify, NULL },
391         { "media",      S_IFREG|S_IRUGO,        proc_ide_read_media,    NULL },
392         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_dmodel,   NULL },
393         { "settings",   S_IFREG|S_IRUSR|S_IWUSR,proc_ide_read_settings, proc_ide_write_settings },
394         { NULL, 0, NULL, NULL }
395 };
396
397 void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
398 {
399         struct proc_dir_entry *ent;
400
401         if (!dir || !p)
402                 return;
403         while (p->name != NULL) {
404                 ent = create_proc_entry(p->name, p->mode, dir);
405                 if (!ent) return;
406                 ent->nlink = 1;
407                 ent->data = data;
408                 ent->read_proc = p->read_proc;
409                 ent->write_proc = p->write_proc;
410                 p++;
411         }
412 }
413
414 void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
415 {
416         if (!dir || !p)
417                 return;
418         while (p->name != NULL) {
419                 remove_proc_entry(p->name, dir);
420                 p++;
421         }
422 }
423
424 static void create_proc_ide_drives(ide_hwif_t *hwif)
425 {
426         int     d;
427         struct proc_dir_entry *ent;
428         struct proc_dir_entry *parent = hwif->proc;
429         char name[64];
430
431         for (d = 0; d < MAX_DRIVES; d++) {
432                 ide_drive_t *drive = &hwif->drives[d];
433
434                 if (!drive->present)
435                         continue;
436                 if (drive->proc)
437                         continue;
438
439                 drive->proc = proc_mkdir(drive->name, parent);
440                 if (drive->proc)
441                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
442                 sprintf(name,"ide%d/%s", (drive->name[2]-'a')/2, drive->name);
443                 ent = proc_symlink(drive->name, proc_ide_root, name);
444                 if (!ent) return;
445         }
446 }
447
448 static void destroy_proc_ide_device(ide_hwif_t *hwif, ide_drive_t *drive)
449 {
450         if (drive->proc) {
451                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
452                 remove_proc_entry(drive->name, proc_ide_root);
453                 remove_proc_entry(drive->name, hwif->proc);
454                 drive->proc = NULL;
455         }
456 }
457
458 static void destroy_proc_ide_drives(ide_hwif_t *hwif)
459 {
460         int     d;
461
462         for (d = 0; d < MAX_DRIVES; d++) {
463                 ide_drive_t *drive = &hwif->drives[d];
464                 if (drive->proc)
465                         destroy_proc_ide_device(hwif, drive);
466         }
467 }
468
469 static ide_proc_entry_t hwif_entries[] = {
470         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
471         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
472         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
473         { NULL, 0, NULL, NULL }
474 };
475
476 void create_proc_ide_interfaces(void)
477 {
478         int     h;
479
480         for (h = 0; h < MAX_HWIFS; h++) {
481                 ide_hwif_t *hwif = &ide_hwifs[h];
482
483                 if (!hwif->present)
484                         continue;
485                 if (!hwif->proc) {
486                         hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
487                         if (!hwif->proc)
488                                 return;
489                         ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
490                 }
491                 create_proc_ide_drives(hwif);
492         }
493 }
494
495 EXPORT_SYMBOL(create_proc_ide_interfaces);
496
497 #ifdef CONFIG_BLK_DEV_IDEPCI
498 void ide_pci_create_host_proc(const char *name, get_info_t *get_info)
499 {
500         create_proc_info_entry(name, 0, proc_ide_root, get_info);
501 }
502
503 EXPORT_SYMBOL_GPL(ide_pci_create_host_proc);
504 #endif
505
506 void destroy_proc_ide_interface(ide_hwif_t *hwif)
507 {
508         if (hwif->proc) {
509                 destroy_proc_ide_drives(hwif);
510                 ide_remove_proc_entries(hwif->proc, hwif_entries);
511                 remove_proc_entry(hwif->name, proc_ide_root);
512                 hwif->proc = NULL;
513         }
514 }
515
516 static int proc_print_driver(struct device_driver *drv, void *data)
517 {
518         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
519         struct seq_file *s = data;
520
521         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
522
523         return 0;
524 }
525
526 static int ide_drivers_show(struct seq_file *s, void *p)
527 {
528         bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
529         return 0;
530 }
531
532 static int ide_drivers_open(struct inode *inode, struct file *file)
533 {
534         return single_open(file, &ide_drivers_show, NULL);
535 }
536
537 static struct file_operations ide_drivers_operations = {
538         .open           = ide_drivers_open,
539         .read           = seq_read,
540         .llseek         = seq_lseek,
541         .release        = single_release,
542 };
543
544 void proc_ide_create(void)
545 {
546         struct proc_dir_entry *entry;
547
548         if (!proc_ide_root)
549                 return;
550
551         create_proc_ide_interfaces();
552
553         entry = create_proc_entry("drivers", 0, proc_ide_root);
554         if (entry)
555                 entry->proc_fops = &ide_drivers_operations;
556 }
557
558 void proc_ide_destroy(void)
559 {
560         remove_proc_entry("drivers", proc_ide_root);
561         remove_proc_entry("ide", NULL);
562 }