drivers/pci/proc.c

   1 /*
   2  *      $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
   3  *
   4  *      Procfs interface for the PCI bus.
   5  *
   6  *      Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/pci.h>
  11 #include <linux/module.h>
  12 #include <linux/proc_fs.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/smp_lock.h>
  15
  16 #include <asm/uaccess.h>
  17 #include <asm/byteorder.h>
  18
  19 static int proc_initialized;    /* = 0 */
  20
  21 static loff_t
  22 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
  23 {
  24         loff_t new = -1;
  25         struct inode *inode = file->f_dentry->d_inode;
  26
  27         down(&inode->i_sem);
  28         switch (whence) {
  29         case 0:
  30                 new = off;
  31                 break;
  32         case 1:
  33                 new = file->f_pos + off;
  34                 break;
  35         case 2:
  36                 new = inode->i_size + off;
  37                 break;
  38         }
  39         if (new < 0 || new > inode->i_size)
  40                 new = -EINVAL;
  41         else
  42                 file->f_pos = new;
  43         up(&inode->i_sem);
  44         return new;
  45 }
  46
  47 static ssize_t
  48 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  49 {
  50         const struct inode *ino = file->f_dentry->d_inode;
  51         const struct proc_dir_entry *dp = PDE(ino);
  52         struct pci_dev *dev = dp->data;
  53         unsigned int pos = *ppos;
  54         unsigned int cnt, size;
  55
  56         /*
  57          * Normal users can read only the standardized portion of the
  58          * configuration space as several chips lock up when trying to read
  59          * undefined locations (think of Intel PIIX4 as a typical example).
  60          */
  61
  62         if (capable(CAP_SYS_ADMIN))
  63                 size = dev->cfg_size;
  64         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  65                 size = 128;
  66         else
  67                 size = 64;
  68
  69         if (pos >= size)
  70                 return 0;
  71         if (nbytes >= size)
  72                 nbytes = size;
  73         if (pos + nbytes > size)
  74                 nbytes = size - pos;
  75         cnt = nbytes;
  76
  77         if (!access_ok(VERIFY_WRITE, buf, cnt))
  78                 return -EINVAL;
  79
  80         if ((pos & 1) && cnt) {
  81                 unsigned char val;
  82                 pci_read_config_byte(dev, pos, &val);
  83                 __put_user(val, buf);
  84                 buf++;
  85                 pos++;
  86                 cnt--;
  87         }
  88
  89         if ((pos & 3) && cnt > 2) {
  90                 unsigned short val;
  91                 pci_read_config_word(dev, pos, &val);
  92                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
  93                 buf += 2;
  94                 pos += 2;
  95                 cnt -= 2;
  96         }
  97
  98         while (cnt >= 4) {
  99                 unsigned int val;
 100                 pci_read_config_dword(dev, pos, &val);
 101                 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
 102                 buf += 4;
 103                 pos += 4;
 104                 cnt -= 4;
 105         }
 106
 107         if (cnt >= 2) {
 108                 unsigned short val;
 109                 pci_read_config_word(dev, pos, &val);
 110                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
 111                 buf += 2;
 112                 pos += 2;
 113                 cnt -= 2;
 114         }
 115
 116         if (cnt) {
 117                 unsigned char val;
 118                 pci_read_config_byte(dev, pos, &val);
 119                 __put_user(val, buf);
 120                 buf++;
 121                 pos++;
 122                 cnt--;
 123         }
 124
 125         *ppos = pos;
 126         return nbytes;
 127 }
 128
 129 static ssize_t
 130 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 131 {
 132         const struct inode *ino = file->f_dentry->d_inode;
 133         const struct proc_dir_entry *dp = PDE(ino);
 134         struct pci_dev *dev = dp->data;
 135         int pos = *ppos;
 136         int size = dev->cfg_size;
 137         int cnt;
 138
 139         if (pos >= size)
 140                 return 0;
 141         if (nbytes >= size)
 142                 nbytes = size;
 143         if (pos + nbytes > size)
 144                 nbytes = size - pos;
 145         cnt = nbytes;
 146
 147         if (!access_ok(VERIFY_READ, buf, cnt))
 148                 return -EINVAL;
 149
 150         if ((pos & 1) && cnt) {
 151                 unsigned char val;
 152                 __get_user(val, buf);
 153                 pci_write_config_byte(dev, pos, val);
 154                 buf++;
 155                 pos++;
 156                 cnt--;
 157         }
 158
 159         if ((pos & 3) && cnt > 2) {
 160                 unsigned short val;
 161                 __get_user(val, (unsigned short __user *) buf);
 162                 pci_write_config_word(dev, pos, le16_to_cpu(val));
 163                 buf += 2;
 164                 pos += 2;
 165                 cnt -= 2;
 166         }
 167
 168         while (cnt >= 4) {
 169                 unsigned int val;
 170                 __get_user(val, (unsigned int __user *) buf);
 171                 pci_write_config_dword(dev, pos, le32_to_cpu(val));
 172                 buf += 4;
 173                 pos += 4;
 174                 cnt -= 4;
 175         }
 176
 177         if (cnt >= 2) {
 178                 unsigned short val;
 179                 __get_user(val, (unsigned short __user *) buf);
 180                 pci_write_config_word(dev, pos, le16_to_cpu(val));
 181                 buf += 2;
 182                 pos += 2;
 183                 cnt -= 2;
 184         }
 185
 186         if (cnt) {
 187                 unsigned char val;
 188                 __get_user(val, buf);
 189                 pci_write_config_byte(dev, pos, val);
 190                 buf++;
 191                 pos++;
 192                 cnt--;
 193         }
 194
 195         *ppos = pos;
 196         return nbytes;
 197 }
 198
 199 struct pci_filp_private {
 200         enum pci_mmap_state mmap_state;
 201         int write_combine;
 202 };
 203
 204 static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 205 {
 206         const struct proc_dir_entry *dp = PDE(inode);
 207         struct pci_dev *dev = dp->data;
 208 #ifdef HAVE_PCI_MMAP
 209         struct pci_filp_private *fpriv = file->private_data;
 210 #endif /* HAVE_PCI_MMAP */
 211         int ret = 0;
 212
 213         switch (cmd) {
 214         case PCIIOC_CONTROLLER:
 215                 ret = pci_domain_nr(dev->bus);
 216                 break;
 217
 218 #ifdef HAVE_PCI_MMAP
 219         case PCIIOC_MMAP_IS_IO:
 220                 fpriv->mmap_state = pci_mmap_io;
 221                 break;
 222
 223         case PCIIOC_MMAP_IS_MEM:
 224                 fpriv->mmap_state = pci_mmap_mem;
 225                 break;
 226
 227         case PCIIOC_WRITE_COMBINE:
 228                 if (arg)
 229                         fpriv->write_combine = 1;
 230                 else
 231                         fpriv->write_combine = 0;
 232                 break;
 233
 234 #endif /* HAVE_PCI_MMAP */
 235
 236         default:
 237                 ret = -EINVAL;
 238                 break;
 239         };
 240
 241         return ret;
 242 }
 243
 244 #ifdef HAVE_PCI_MMAP
 245 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 246 {
 247         struct inode *inode = file->f_dentry->d_inode;
 248         const struct proc_dir_entry *dp = PDE(inode);
 249         struct pci_dev *dev = dp->data;
 250         struct pci_filp_private *fpriv = file->private_data;
 251         int ret;
 252
 253         if (!capable(CAP_SYS_RAWIO))
 254                 return -EPERM;
 255
 256         ret = pci_mmap_page_range(dev, vma,
 257                                   fpriv->mmap_state,
 258                                   fpriv->write_combine);
 259         if (ret < 0)
 260                 return ret;
 261
 262         return 0;
 263 }
 264
 265 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 266 {
 267         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 268
 269         if (!fpriv)
 270                 return -ENOMEM;
 271
 272         fpriv->mmap_state = pci_mmap_io;
 273         fpriv->write_combine = 0;
 274
 275         file->private_data = fpriv;
 276
 277         return 0;
 278 }
 279
 280 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 281 {
 282         kfree(file->private_data);
 283         file->private_data = NULL;
 284
 285         return 0;
 286 }
 287 #endif /* HAVE_PCI_MMAP */
 288
 289 static struct file_operations proc_bus_pci_operations = {
 290         .llseek         = proc_bus_pci_lseek,
 291         .read           = proc_bus_pci_read,
 292         .write          = proc_bus_pci_write,
 293         .ioctl          = proc_bus_pci_ioctl,
 294 #ifdef HAVE_PCI_MMAP
 295         .open           = proc_bus_pci_open,
 296         .release        = proc_bus_pci_release,
 297         .mmap           = proc_bus_pci_mmap,
 298 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 299         .get_unmapped_area = get_pci_unmapped_area,
 300 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 301 #endif /* HAVE_PCI_MMAP */
 302 };
 303
 304 #if BITS_PER_LONG == 32
 305 #define LONG_FORMAT "\t%08lx"
 306 #else
 307 #define LONG_FORMAT "\t%16lx"
 308 #endif
 309
 310 /* iterator */
 311 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 312 {
 313         struct pci_dev *dev = NULL;
 314         loff_t n = *pos;
 315
 316         for_each_pci_dev(dev) {
 317                 if (!n--)
 318                         break;
 319         }
 320         return dev;
 321 }
 322
 323 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 324 {
 325         struct pci_dev *dev = v;
 326
 327         (*pos)++;
 328         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 329         return dev;
 330 }
 331
 332 static void pci_seq_stop(struct seq_file *m, void *v)
 333 {
 334         if (v) {
 335                 struct pci_dev *dev = v;
 336                 pci_dev_put(dev);
 337         }
 338 }
 339
 340 static int show_device(struct seq_file *m, void *v)
 341 {
 342         const struct pci_dev *dev = v;
 343         const struct pci_driver *drv;
 344         int i;
 345
 346         if (dev == NULL)
 347                 return 0;
 348
 349         drv = pci_dev_driver(dev);
 350         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 351                         dev->bus->number,
 352                         dev->devfn,
 353                         dev->vendor,
 354                         dev->device,
 355                         dev->irq);
 356         /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 357         for(i=0; i<7; i++)
 358                 seq_printf(m, LONG_FORMAT,
 359                         dev->resource[i].start |
 360                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK));
 361         for(i=0; i<7; i++)
 362                 seq_printf(m, LONG_FORMAT,
 363                         dev->resource[i].start < dev->resource[i].end ?
 364                         dev->resource[i].end - dev->resource[i].start + 1 : 0);
 365         seq_putc(m, '\t');
 366         if (drv)
 367                 seq_printf(m, "%s", drv->name);
 368         seq_putc(m, '\n');
 369         return 0;
 370 }
 371
 372 static struct seq_operations proc_bus_pci_devices_op = {
 373         .start  = pci_seq_start,
 374         .next   = pci_seq_next,
 375         .stop   = pci_seq_stop,
 376         .show   = show_device
 377 };
 378
 379 static struct proc_dir_entry *proc_bus_pci_dir;
 380
 381 int pci_proc_attach_device(struct pci_dev *dev)
 382 {
 383         struct pci_bus *bus = dev->bus;
 384         struct proc_dir_entry *e;
 385         char name[16];
 386
 387         if (!proc_initialized)
 388                 return -EACCES;
 389
 390         if (!bus->procdir) {
 391                 if (pci_proc_domain(bus)) {
 392                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 393                                         bus->number);
 394                 } else {
 395                         sprintf(name, "%02x", bus->number);
 396                 }
 397                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 398                 if (!bus->procdir)
 399                         return -ENOMEM;
 400         }
 401
 402         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 403         e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
 404         if (!e)
 405                 return -ENOMEM;
 406         e->proc_fops = &proc_bus_pci_operations;
 407         e->data = dev;
 408         e->size = dev->cfg_size;
 409         dev->procent = e;
 410
 411         return 0;
 412 }
 413
 414 int pci_proc_detach_device(struct pci_dev *dev)
 415 {
 416         struct proc_dir_entry *e;
 417
 418         if ((e = dev->procent)) {
 419                 if (atomic_read(&e->count))
 420                         return -EBUSY;
 421                 remove_proc_entry(e->name, dev->bus->procdir);
 422                 dev->procent = NULL;
 423         }
 424         return 0;
 425 }
 426
 427 int pci_proc_attach_bus(struct pci_bus* bus)
 428 {
 429         struct proc_dir_entry *de = bus->procdir;
 430
 431         if (!proc_initialized)
 432                 return -EACCES;
 433
 434         if (!de) {
 435                 char name[16];
 436                 sprintf(name, "%02x", bus->number);
 437                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 438                 if (!de)
 439                         return -ENOMEM;
 440         }
 441         return 0;
 442 }
 443
 444 int pci_proc_detach_bus(struct pci_bus* bus)
 445 {
 446         struct proc_dir_entry *de = bus->procdir;
 447         if (de)
 448                 remove_proc_entry(de->name, proc_bus_pci_dir);
 449         return 0;
 450 }
 451
 452 #ifdef CONFIG_PCI_LEGACY_PROC
 453
 454 /*
 455  *  Backward compatible /proc/pci interface.
 456  */
 457
 458 /*
 459  * Convert some of the configuration space registers of the device at
 460  * address (bus,devfn) into a string (possibly several lines each).
 461  * The configuration string is stored starting at buf[len].  If the
 462  * string would exceed the size of the buffer (SIZE), 0 is returned.
 463  */
 464 static int show_dev_config(struct seq_file *m, void *v)
 465 {
 466         struct pci_dev *dev = v;
 467         struct pci_dev *first_dev;
 468         struct pci_driver *drv;
 469         u32 class_rev;
 470         unsigned char latency, min_gnt, max_lat, *class;
 471         int reg;
 472
 473         first_dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
 474         if (dev == first_dev)
 475                 seq_puts(m, "PCI devices found:\n");
 476         pci_dev_put(first_dev);
 477
 478         drv = pci_dev_driver(dev);
 479
 480         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
 481         pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency);
 482         pci_read_config_byte (dev, PCI_MIN_GNT, &min_gnt);
 483         pci_read_config_byte (dev, PCI_MAX_LAT, &max_lat);
 484         seq_printf(m, "  Bus %2d, device %3d, function %2d:\n",
 485                dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 486         class = pci_class_name(class_rev >> 16);
 487         if (class)
 488                 seq_printf(m, "    %s", class);
 489         else
 490                 seq_printf(m, "    Class %04x", class_rev >> 16);
 491 #ifdef CONFIG_PCI_NAMES
 492         seq_printf(m, ": %s", dev->pretty_name);
 493 #else
 494         seq_printf(m, ": PCI device %04x:%04x", dev->vendor, dev->device);
 495 #endif
 496         seq_printf(m, " (rev %d).\n", class_rev & 0xff);
 497
 498         if (dev->irq)
 499                 seq_printf(m, "      IRQ %d.\n", dev->irq);
 500
 501         if (latency || min_gnt || max_lat) {
 502                 seq_printf(m, "      Master Capable.  ");
 503                 if (latency)
 504                         seq_printf(m, "Latency=%d.  ", latency);
 505                 else
 506                         seq_puts(m, "No bursts.  ");
 507                 if (min_gnt)
 508                         seq_printf(m, "Min Gnt=%d.", min_gnt);
 509                 if (max_lat)
 510                         seq_printf(m, "Max Lat=%d.", max_lat);
 511                 seq_putc(m, '\n');
 512         }
 513
 514         for (reg = 0; reg < 6; reg++) {
 515                 struct resource *res = dev->resource + reg;
 516                 unsigned long base, end, flags;
 517
 518                 base = res->start;
 519                 end = res->end;
 520                 flags = res->flags;
 521                 if (!end)
 522                         continue;
 523
 524                 if (flags & PCI_BASE_ADDRESS_SPACE_IO) {
 525                         seq_printf(m, "      I/O at 0x%lx [0x%lx].\n",
 526                                 base, end);
 527                 } else {
 528                         const char *pref, *type = "unknown";
 529
 530                         if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
 531                                 pref = "P";
 532                         else
 533                                 pref = "Non-p";
 534                         switch (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) {
 535                               case PCI_BASE_ADDRESS_MEM_TYPE_32:
 536                                 type = "32 bit"; break;
 537                               case PCI_BASE_ADDRESS_MEM_TYPE_1M:
 538                                 type = "20 bit"; break;
 539                               case PCI_BASE_ADDRESS_MEM_TYPE_64:
 540                                 type = "64 bit"; break;
 541                         }
 542                         seq_printf(m, "      %srefetchable %s memory at "
 543                                        "0x%lx [0x%lx].\n", pref, type,
 544                                        base,
 545                                        end);
 546                 }
 547         }
 548         return 0;
 549 }
 550
 551 static struct seq_operations proc_pci_op = {
 552         .start  = pci_seq_start,
 553         .next   = pci_seq_next,
 554         .stop   = pci_seq_stop,
 555         .show   = show_dev_config
 556 };
 557
 558 static int proc_pci_open(struct inode *inode, struct file *file)
 559 {
 560         return seq_open(file, &proc_pci_op);
 561 }
 562 static struct file_operations proc_pci_operations = {
 563         .open           = proc_pci_open,
 564         .read           = seq_read,
 565         .llseek         = seq_lseek,
 566         .release        = seq_release,
 567 };
 568
 569 static void legacy_proc_init(void)
 570 {
 571         struct proc_dir_entry * entry = create_proc_entry("pci", 0, NULL);
 572         if (entry)
 573                 entry->proc_fops = &proc_pci_operations;
 574 }
 575
 576 #else
 577
 578 static void legacy_proc_init(void)
 579 {
 580
 581 }
 582
 583 #endif /* CONFIG_PCI_LEGACY_PROC */
 584
 585 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 586 {
 587         return seq_open(file, &proc_bus_pci_devices_op);
 588 }
 589 static struct file_operations proc_bus_pci_dev_operations = {
 590         .open           = proc_bus_pci_dev_open,
 591         .read           = seq_read,
 592         .llseek         = seq_lseek,
 593         .release        = seq_release,
 594 };
 595
 596 static int __init pci_proc_init(void)
 597 {
 598         struct proc_dir_entry *entry;
 599         struct pci_dev *dev = NULL;
 600         proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
 601         entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
 602         if (entry)
 603                 entry->proc_fops = &proc_bus_pci_dev_operations;
 604         proc_initialized = 1;
 605         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 606                 pci_proc_attach_device(dev);
 607         }
 608         legacy_proc_init();
 609         return 0;
 610 }
 611
 612 __initcall(pci_proc_init);
 613
 614 #ifdef CONFIG_HOTPLUG
 615 EXPORT_SYMBOL(pci_proc_attach_device);
 616 EXPORT_SYMBOL(pci_proc_attach_bus);
 617 EXPORT_SYMBOL(pci_proc_detach_bus);
 618 #endif
 619