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/capability.h>
  15 #include <asm/uaccess.h>
  16 #include <asm/byteorder.h>
  17 #include "pci.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_path.dentry->d_inode;
  26
  27         mutex_lock(&inode->i_mutex);
  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         mutex_unlock(&inode->i_mutex);
  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_path.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_user_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_user_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_user_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_user_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_user_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_path.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_user_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_user_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_user_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_user_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_user_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_path.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 const 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 /* iterator */
 305 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 306 {
 307         struct pci_dev *dev = NULL;
 308         loff_t n = *pos;
 309
 310         for_each_pci_dev(dev) {
 311                 if (!n--)
 312                         break;
 313         }
 314         return dev;
 315 }
 316
 317 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 318 {
 319         struct pci_dev *dev = v;
 320
 321         (*pos)++;
 322         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 323         return dev;
 324 }
 325
 326 static void pci_seq_stop(struct seq_file *m, void *v)
 327 {
 328         if (v) {
 329                 struct pci_dev *dev = v;
 330                 pci_dev_put(dev);
 331         }
 332 }
 333
 334 static int show_device(struct seq_file *m, void *v)
 335 {
 336         const struct pci_dev *dev = v;
 337         const struct pci_driver *drv;
 338         int i;
 339
 340         if (dev == NULL)
 341                 return 0;
 342
 343         drv = pci_dev_driver(dev);
 344         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 345                         dev->bus->number,
 346                         dev->devfn,
 347                         dev->vendor,
 348                         dev->device,
 349                         dev->irq);
 350         /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 351         for (i=0; i<7; i++) {
 352                 resource_size_t start, end;
 353                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 354                 seq_printf(m, "\t%16llx",
 355                         (unsigned long long)(start |
 356                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 357         }
 358         for (i=0; i<7; i++) {
 359                 resource_size_t start, end;
 360                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 361                 seq_printf(m, "\t%16llx",
 362                         dev->resource[i].start < dev->resource[i].end ?
 363                         (unsigned long long)(end - start) + 1 : 0);
 364         }
 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 #if 0
 428 int pci_proc_attach_bus(struct pci_bus* bus)
 429 {
 430         struct proc_dir_entry *de = bus->procdir;
 431
 432         if (!proc_initialized)
 433                 return -EACCES;
 434
 435         if (!de) {
 436                 char name[16];
 437                 sprintf(name, "%02x", bus->number);
 438                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 439                 if (!de)
 440                         return -ENOMEM;
 441         }
 442         return 0;
 443 }
 444 #endif  /*  0  */
 445
 446 int pci_proc_detach_bus(struct pci_bus* bus)
 447 {
 448         struct proc_dir_entry *de = bus->procdir;
 449         if (de)
 450                 remove_proc_entry(de->name, proc_bus_pci_dir);
 451         return 0;
 452 }
 453
 454 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 455 {
 456         return seq_open(file, &proc_bus_pci_devices_op);
 457 }
 458 static const struct file_operations proc_bus_pci_dev_operations = {
 459         .open           = proc_bus_pci_dev_open,
 460         .read           = seq_read,
 461         .llseek         = seq_lseek,
 462         .release        = seq_release,
 463 };
 464
 465 static int __init pci_proc_init(void)
 466 {
 467         struct proc_dir_entry *entry;
 468         struct pci_dev *dev = NULL;
 469         proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
 470         entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
 471         if (entry)
 472                 entry->proc_fops = &proc_bus_pci_dev_operations;
 473         proc_initialized = 1;
 474         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 475                 pci_proc_attach_device(dev);
 476         }
 477         return 0;
 478 }
 479
 480 __initcall(pci_proc_init);
 481
 482 #ifdef CONFIG_HOTPLUG
 483 EXPORT_SYMBOL(pci_proc_detach_bus);
 484 #endif
 485