drivers/ide/ide-proc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1997-1998     Mark Lord
   4  *  Copyright (C) 2003          Red Hat
   5  *
   6  *  Some code was moved here from ide.c, see it for original copyrights.
   7  */
   8
   9 /*
  10  * This is the /proc/ide/ filesystem implementation.
  11  *
  12  * Drive/Driver settings can be retrieved by reading the drive's
  13  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
  14  * To write a new value "val" into a specific setting "name", use:
  15  *   echo "name:val" >/proc/ide/ide0/hda/settings
  16  */
  17
  18 #include <linux/module.h>
  19
  20 #include <linux/uaccess.h>
  21 #include <linux/errno.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/stat.h>
  24 #include <linux/mm.h>
  25 #include <linux/pci.h>
  26 #include <linux/ctype.h>
  27 #include <linux/ide.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/slab.h>
  30
  31 #include <asm/io.h>
  32
  33 static struct proc_dir_entry *proc_ide_root;
  34
  35 static int ide_imodel_proc_show(struct seq_file *m, void *v)
  36 {
  37         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  38         const char      *name;
  39
  40         switch (hwif->chipset) {
  41         case ide_generic:       name = "generic";       break;
  42         case ide_pci:           name = "pci";           break;
  43         case ide_cmd640:        name = "cmd640";        break;
  44         case ide_dtc2278:       name = "dtc2278";       break;
  45         case ide_ali14xx:       name = "ali14xx";       break;
  46         case ide_qd65xx:        name = "qd65xx";        break;
  47         case ide_umc8672:       name = "umc8672";       break;
  48         case ide_ht6560b:       name = "ht6560b";       break;
  49         case ide_4drives:       name = "4drives";       break;
  50         case ide_pmac:          name = "mac-io";        break;
  51         case ide_au1xxx:        name = "au1xxx";        break;
  52         case ide_palm3710:      name = "palm3710";      break;
  53         case ide_acorn:         name = "acorn";         break;
  54         default:                name = "(unknown)";     break;
  55         }
  56         seq_printf(m, "%s\n", name);
  57         return 0;
  58 }
  59
  60 static int ide_mate_proc_show(struct seq_file *m, void *v)
  61 {
  62         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  63
  64         if (hwif && hwif->mate)
  65                 seq_printf(m, "%s\n", hwif->mate->name);
  66         else
  67                 seq_printf(m, "(none)\n");
  68         return 0;
  69 }
  70
  71 static int ide_channel_proc_show(struct seq_file *m, void *v)
  72 {
  73         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
  74
  75         seq_printf(m, "%c\n", hwif->channel ? '1' : '0');
  76         return 0;
  77 }
  78
  79 static int ide_identify_proc_show(struct seq_file *m, void *v)
  80 {
  81         ide_drive_t *drive = (ide_drive_t *)m->private;
  82         u8 *buf;
  83
  84         if (!drive) {
  85                 seq_putc(m, '\n');
  86                 return 0;
  87         }
  88
  89         buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
  90         if (!buf)
  91                 return -ENOMEM;
  92         if (taskfile_lib_get_identify(drive, buf) == 0) {
  93                 __le16 *val = (__le16 *)buf;
  94                 int i;
  95
  96                 for (i = 0; i < SECTOR_SIZE / 2; i++) {
  97                         seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
  98                                         (i % 8) == 7 ? '\n' : ' ');
  99                 }
 100         } else
 101                 seq_putc(m, buf[0]);
 102         kfree(buf);
 103         return 0;
 104 }
 105
 106 /**
 107  *      ide_find_setting        -       find a specific setting
 108  *      @st: setting table pointer
 109  *      @name: setting name
 110  *
 111  *      Scan's the setting table for a matching entry and returns
 112  *      this or NULL if no entry is found. The caller must hold the
 113  *      setting semaphore
 114  */
 115
 116 static
 117 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
 118                                                char *name)
 119 {
 120         while (st->name) {
 121                 if (strcmp(st->name, name) == 0)
 122                         break;
 123                 st++;
 124         }
 125         return st->name ? st : NULL;
 126 }
 127
 128 /**
 129  *      ide_read_setting        -       read an IDE setting
 130  *      @drive: drive to read from
 131  *      @setting: drive setting
 132  *
 133  *      Read a drive setting and return the value. The caller
 134  *      must hold the ide_setting_mtx when making this call.
 135  *
 136  *      BUGS: the data return and error are the same return value
 137  *      so an error -EINVAL and true return of the same value cannot
 138  *      be told apart
 139  */
 140
 141 static int ide_read_setting(ide_drive_t *drive,
 142                             const struct ide_proc_devset *setting)
 143 {
 144         const struct ide_devset *ds = setting->setting;
 145         int val = -EINVAL;
 146
 147         if (ds->get)
 148                 val = ds->get(drive);
 149
 150         return val;
 151 }
 152
 153 /**
 154  *      ide_write_setting       -       read an IDE setting
 155  *      @drive: drive to read from
 156  *      @setting: drive setting
 157  *      @val: value
 158  *
 159  *      Write a drive setting if it is possible. The caller
 160  *      must hold the ide_setting_mtx when making this call.
 161  *
 162  *      BUGS: the data return and error are the same return value
 163  *      so an error -EINVAL and true return of the same value cannot
 164  *      be told apart
 165  *
 166  *      FIXME:  This should be changed to enqueue a special request
 167  *      to the driver to change settings, and then wait on a sema for completion.
 168  *      The current scheme of polling is kludgy, though safe enough.
 169  */
 170
 171 static int ide_write_setting(ide_drive_t *drive,
 172                              const struct ide_proc_devset *setting, int val)
 173 {
 174         const struct ide_devset *ds = setting->setting;
 175
 176         if (!capable(CAP_SYS_ADMIN))
 177                 return -EACCES;
 178         if (!ds->set)
 179                 return -EPERM;
 180         if ((ds->flags & DS_SYNC)
 181             && (val < setting->min || val > setting->max))
 182                 return -EINVAL;
 183         return ide_devset_execute(drive, ds, val);
 184 }
 185
 186 ide_devset_get(xfer_rate, current_speed);
 187
 188 static int set_xfer_rate (ide_drive_t *drive, int arg)
 189 {
 190         struct ide_cmd cmd;
 191
 192         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
 193                 return -EINVAL;
 194
 195         memset(&cmd, 0, sizeof(cmd));
 196         cmd.tf.command = ATA_CMD_SET_FEATURES;
 197         cmd.tf.feature = SETFEATURES_XFER;
 198         cmd.tf.nsect   = (u8)arg;
 199         cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 200         cmd.valid.in.tf  = IDE_VALID_NSECT;
 201         cmd.tf_flags   = IDE_TFLAG_SET_XFER;
 202
 203         return ide_no_data_taskfile(drive, &cmd);
 204 }
 205
 206 ide_devset_rw(current_speed, xfer_rate);
 207 ide_devset_rw_field(init_speed, init_speed);
 208 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
 209 ide_devset_ro_field(number, dn);
 210
 211 static const struct ide_proc_devset ide_generic_settings[] = {
 212         IDE_PROC_DEVSET(current_speed, 0, 70),
 213         IDE_PROC_DEVSET(init_speed, 0, 70),
 214         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
 215         IDE_PROC_DEVSET(keepsettings, 0, 1),
 216         IDE_PROC_DEVSET(nice1, 0, 1),
 217         IDE_PROC_DEVSET(number, 0, 3),
 218         IDE_PROC_DEVSET(pio_mode, 0, 255),
 219         IDE_PROC_DEVSET(unmaskirq, 0, 1),
 220         IDE_PROC_DEVSET(using_dma, 0, 1),
 221         { NULL },
 222 };
 223
 224 static void proc_ide_settings_warn(void)
 225 {
 226         printk_once(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
 227                             "obsolete, and will be removed soon!\n");
 228 }
 229
 230 static int ide_settings_proc_show(struct seq_file *m, void *v)
 231 {
 232         const struct ide_proc_devset *setting, *g, *d;
 233         const struct ide_devset *ds;
 234         ide_drive_t     *drive = (ide_drive_t *) m->private;
 235         int             rc, mul_factor, div_factor;
 236
 237         proc_ide_settings_warn();
 238
 239         mutex_lock(&ide_setting_mtx);
 240         g = ide_generic_settings;
 241         d = drive->settings;
 242         seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
 243         seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
 244         while (g->name || (d && d->name)) {
 245                 /* read settings in the alphabetical order */
 246                 if (g->name && d && d->name) {
 247                         if (strcmp(d->name, g->name) < 0)
 248                                 setting = d++;
 249                         else
 250                                 setting = g++;
 251                 } else if (d && d->name) {
 252                         setting = d++;
 253                 } else
 254                         setting = g++;
 255                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 256                 div_factor = setting->divf ? setting->divf(drive) : 1;
 257                 seq_printf(m, "%-24s", setting->name);
 258                 rc = ide_read_setting(drive, setting);
 259                 if (rc >= 0)
 260                         seq_printf(m, "%-16d", rc * mul_factor / div_factor);
 261                 else
 262                         seq_printf(m, "%-16s", "write-only");
 263                 seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
 264                 ds = setting->setting;
 265                 if (ds->get)
 266                         seq_printf(m, "r");
 267                 if (ds->set)
 268                         seq_printf(m, "w");
 269                 seq_printf(m, "\n");
 270         }
 271         mutex_unlock(&ide_setting_mtx);
 272         return 0;
 273 }
 274
 275 static int ide_settings_proc_open(struct inode *inode, struct file *file)
 276 {
 277         return single_open(file, ide_settings_proc_show, PDE_DATA(inode));
 278 }
 279
 280 #define MAX_LEN 30
 281
 282 static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
 283                                        size_t count, loff_t *pos)
 284 {
 285         ide_drive_t     *drive = PDE_DATA(file_inode(file));
 286         char            name[MAX_LEN + 1];
 287         int             for_real = 0, mul_factor, div_factor;
 288         unsigned long   n;
 289
 290         const struct ide_proc_devset *setting;
 291         char *buf, *s;
 292
 293         if (!capable(CAP_SYS_ADMIN))
 294                 return -EACCES;
 295
 296         proc_ide_settings_warn();
 297
 298         if (count >= PAGE_SIZE)
 299                 return -EINVAL;
 300
 301         s = buf = (char *)__get_free_page(GFP_USER);
 302         if (!buf)
 303                 return -ENOMEM;
 304
 305         if (copy_from_user(buf, buffer, count)) {
 306                 free_page((unsigned long)buf);
 307                 return -EFAULT;
 308         }
 309
 310         buf[count] = '\0';
 311
 312         /*
 313          * Skip over leading whitespace
 314          */
 315         while (count && isspace(*s)) {
 316                 --count;
 317                 ++s;
 318         }
 319         /*
 320          * Do one full pass to verify all parameters,
 321          * then do another to actually write the new settings.
 322          */
 323         do {
 324                 char *p = s;
 325                 n = count;
 326                 while (n > 0) {
 327                         unsigned val;
 328                         char *q = p;
 329
 330                         while (n > 0 && *p != ':') {
 331                                 --n;
 332                                 p++;
 333                         }
 334                         if (*p != ':')
 335                                 goto parse_error;
 336                         if (p - q > MAX_LEN)
 337                                 goto parse_error;
 338                         memcpy(name, q, p - q);
 339                         name[p - q] = 0;
 340
 341                         if (n > 0) {
 342                                 --n;
 343                                 p++;
 344                         } else
 345                                 goto parse_error;
 346
 347                         val = simple_strtoul(p, &q, 10);
 348                         n -= q - p;
 349                         p = q;
 350                         if (n > 0 && !isspace(*p))
 351                                 goto parse_error;
 352                         while (n > 0 && isspace(*p)) {
 353                                 --n;
 354                                 ++p;
 355                         }
 356
 357                         mutex_lock(&ide_setting_mtx);
 358                         /* generic settings first, then driver specific ones */
 359                         setting = ide_find_setting(ide_generic_settings, name);
 360                         if (!setting) {
 361                                 if (drive->settings)
 362                                         setting = ide_find_setting(drive->settings, name);
 363                                 if (!setting) {
 364                                         mutex_unlock(&ide_setting_mtx);
 365                                         goto parse_error;
 366                                 }
 367                         }
 368                         if (for_real) {
 369                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
 370                                 div_factor = setting->divf ? setting->divf(drive) : 1;
 371                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
 372                         }
 373                         mutex_unlock(&ide_setting_mtx);
 374                 }
 375         } while (!for_real++);
 376         free_page((unsigned long)buf);
 377         return count;
 378 parse_error:
 379         free_page((unsigned long)buf);
 380         printk("%s(): parse error\n", __func__);
 381         return -EINVAL;
 382 }
 383
 384 static const struct proc_ops ide_settings_proc_ops = {
 385         .proc_open      = ide_settings_proc_open,
 386         .proc_read      = seq_read,
 387         .proc_lseek     = seq_lseek,
 388         .proc_release   = single_release,
 389         .proc_write     = ide_settings_proc_write,
 390 };
 391
 392 int ide_capacity_proc_show(struct seq_file *m, void *v)
 393 {
 394         seq_printf(m, "%llu\n", (long long)0x7fffffff);
 395         return 0;
 396 }
 397 EXPORT_SYMBOL_GPL(ide_capacity_proc_show);
 398
 399 int ide_geometry_proc_show(struct seq_file *m, void *v)
 400 {
 401         ide_drive_t     *drive = (ide_drive_t *) m->private;
 402
 403         seq_printf(m, "physical     %d/%d/%d\n",
 404                         drive->cyl, drive->head, drive->sect);
 405         seq_printf(m, "logical      %d/%d/%d\n",
 406                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(ide_geometry_proc_show);
 410
 411 static int ide_dmodel_proc_show(struct seq_file *seq, void *v)
 412 {
 413         ide_drive_t     *drive = (ide_drive_t *) seq->private;
 414         char            *m = (char *)&drive->id[ATA_ID_PROD];
 415
 416         seq_printf(seq, "%.40s\n", m[0] ? m : "(none)");
 417         return 0;
 418 }
 419
 420 static int ide_driver_proc_show(struct seq_file *m, void *v)
 421 {
 422         ide_drive_t             *drive = (ide_drive_t *)m->private;
 423         struct device           *dev = &drive->gendev;
 424         struct ide_driver       *ide_drv;
 425
 426         if (dev->driver) {
 427                 ide_drv = to_ide_driver(dev->driver);
 428                 seq_printf(m, "%s version %s\n",
 429                                 dev->driver->name, ide_drv->version);
 430         } else
 431                 seq_printf(m, "ide-default version 0.9.newide\n");
 432         return 0;
 433 }
 434
 435 static int ide_media_proc_show(struct seq_file *m, void *v)
 436 {
 437         ide_drive_t     *drive = (ide_drive_t *) m->private;
 438         const char      *media;
 439
 440         switch (drive->media) {
 441         case ide_disk:          media = "disk\n";       break;
 442         case ide_cdrom:         media = "cdrom\n";      break;
 443         case ide_tape:          media = "tape\n";       break;
 444         case ide_floppy:        media = "floppy\n";     break;
 445         case ide_optical:       media = "optical\n";    break;
 446         default:                media = "UNKNOWN\n";    break;
 447         }
 448         seq_puts(m, media);
 449         return 0;
 450 }
 451
 452 static int ide_media_proc_open(struct inode *inode, struct file *file)
 453 {
 454         return single_open(file, ide_media_proc_show, PDE_DATA(inode));
 455 }
 456
 457 static const struct file_operations ide_media_proc_fops = {
 458         .owner          = THIS_MODULE,
 459         .open           = ide_media_proc_open,
 460         .read           = seq_read,
 461         .llseek         = seq_lseek,
 462         .release        = single_release,
 463 };
 464
 465 static ide_proc_entry_t generic_drive_entries[] = {
 466         { "driver",     S_IFREG|S_IRUGO,         ide_driver_proc_show   },
 467         { "identify",   S_IFREG|S_IRUSR,         ide_identify_proc_show },
 468         { "media",      S_IFREG|S_IRUGO,         ide_media_proc_show    },
 469         { "model",      S_IFREG|S_IRUGO,         ide_dmodel_proc_show   },
 470         {}
 471 };
 472
 473 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
 474 {
 475         struct proc_dir_entry *ent;
 476
 477         if (!dir || !p)
 478                 return;
 479         while (p->name != NULL) {
 480                 ent = proc_create_single_data(p->name, p->mode, dir, p->show, data);
 481                 if (!ent) return;
 482                 p++;
 483         }
 484 }
 485
 486 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
 487 {
 488         if (!dir || !p)
 489                 return;
 490         while (p->name != NULL) {
 491                 remove_proc_entry(p->name, dir);
 492                 p++;
 493         }
 494 }
 495
 496 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
 497 {
 498         mutex_lock(&ide_setting_mtx);
 499         drive->settings = driver->proc_devsets(drive);
 500         mutex_unlock(&ide_setting_mtx);
 501
 502         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
 503 }
 504
 505 EXPORT_SYMBOL(ide_proc_register_driver);
 506
 507 /**
 508  *      ide_proc_unregister_driver      -       remove driver specific data
 509  *      @drive: drive
 510  *      @driver: driver
 511  *
 512  *      Clean up the driver specific /proc files and IDE settings
 513  *      for a given drive.
 514  *
 515  *      Takes ide_setting_mtx.
 516  */
 517
 518 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
 519 {
 520         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
 521
 522         mutex_lock(&ide_setting_mtx);
 523         /*
 524          * ide_setting_mtx protects both the settings list and the use
 525          * of settings (we cannot take a setting out that is being used).
 526          */
 527         drive->settings = NULL;
 528         mutex_unlock(&ide_setting_mtx);
 529 }
 530 EXPORT_SYMBOL(ide_proc_unregister_driver);
 531
 532 void ide_proc_port_register_devices(ide_hwif_t *hwif)
 533 {
 534         struct proc_dir_entry *ent;
 535         struct proc_dir_entry *parent = hwif->proc;
 536         ide_drive_t *drive;
 537         char name[64];
 538         int i;
 539
 540         ide_port_for_each_dev(i, drive, hwif) {
 541                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 542                         continue;
 543
 544                 drive->proc = proc_mkdir(drive->name, parent);
 545                 if (drive->proc) {
 546                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
 547                         proc_create_data("settings", S_IFREG|S_IRUSR|S_IWUSR,
 548                                         drive->proc, &ide_settings_proc_ops,
 549                                         drive);
 550                 }
 551                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
 552                 ent = proc_symlink(drive->name, proc_ide_root, name);
 553                 if (!ent) return;
 554         }
 555 }
 556
 557 void ide_proc_unregister_device(ide_drive_t *drive)
 558 {
 559         if (drive->proc) {
 560                 remove_proc_entry("settings", drive->proc);
 561                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
 562                 remove_proc_entry(drive->name, proc_ide_root);
 563                 remove_proc_entry(drive->name, drive->hwif->proc);
 564                 drive->proc = NULL;
 565         }
 566 }
 567
 568 static ide_proc_entry_t hwif_entries[] = {
 569         { "channel",    S_IFREG|S_IRUGO,        ide_channel_proc_show   },
 570         { "mate",       S_IFREG|S_IRUGO,        ide_mate_proc_show      },
 571         { "model",      S_IFREG|S_IRUGO,        ide_imodel_proc_show    },
 572         {}
 573 };
 574
 575 void ide_proc_register_port(ide_hwif_t *hwif)
 576 {
 577         if (!hwif->proc) {
 578                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
 579
 580                 if (!hwif->proc)
 581                         return;
 582
 583                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
 584         }
 585 }
 586
 587 void ide_proc_unregister_port(ide_hwif_t *hwif)
 588 {
 589         if (hwif->proc) {
 590                 ide_remove_proc_entries(hwif->proc, hwif_entries);
 591                 remove_proc_entry(hwif->name, proc_ide_root);
 592                 hwif->proc = NULL;
 593         }
 594 }
 595
 596 static int proc_print_driver(struct device_driver *drv, void *data)
 597 {
 598         struct ide_driver *ide_drv = to_ide_driver(drv);
 599         struct seq_file *s = data;
 600
 601         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
 602
 603         return 0;
 604 }
 605
 606 static int ide_drivers_show(struct seq_file *s, void *p)
 607 {
 608         int err;
 609
 610         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
 611         if (err < 0)
 612                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
 613                         __func__, err);
 614         return 0;
 615 }
 616
 617 DEFINE_PROC_SHOW_ATTRIBUTE(ide_drivers);
 618
 619 void proc_ide_create(void)
 620 {
 621         proc_ide_root = proc_mkdir("ide", NULL);
 622
 623         if (!proc_ide_root)
 624                 return;
 625
 626         proc_create("drivers", 0, proc_ide_root, &ide_drivers_proc_ops);
 627 }
 628
 629 void proc_ide_destroy(void)
 630 {
 631         remove_proc_entry("drivers", proc_ide_root);
 632         remove_proc_entry("ide", NULL);
 633 }