drivers/pci/proc.c

   1 /*
   2  *      Procfs interface for the PCI bus.
   3  *
   4  *      Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/pci.h>
   9 #include <linux/slab.h>
  10 #include <linux/module.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/capability.h>
  14 #include <linux/uaccess.h>
  15 #include <asm/byteorder.h>
  16 #include "pci.h"
  17
  18 static int proc_initialized;    /* = 0 */
  19
  20 static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
  21 {
  22         struct pci_dev *dev = PDE_DATA(file_inode(file));
  23         return fixed_size_llseek(file, off, whence, dev->cfg_size);
  24 }
  25
  26 static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
  27                                  size_t nbytes, loff_t *ppos)
  28 {
  29         struct pci_dev *dev = PDE_DATA(file_inode(file));
  30         unsigned int pos = *ppos;
  31         unsigned int cnt, size;
  32
  33         /*
  34          * Normal users can read only the standardized portion of the
  35          * configuration space as several chips lock up when trying to read
  36          * undefined locations (think of Intel PIIX4 as a typical example).
  37          */
  38
  39         if (capable(CAP_SYS_ADMIN))
  40                 size = dev->cfg_size;
  41         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  42                 size = 128;
  43         else
  44                 size = 64;
  45
  46         if (pos >= size)
  47                 return 0;
  48         if (nbytes >= size)
  49                 nbytes = size;
  50         if (pos + nbytes > size)
  51                 nbytes = size - pos;
  52         cnt = nbytes;
  53
  54         if (!access_ok(VERIFY_WRITE, buf, cnt))
  55                 return -EINVAL;
  56
  57         pci_config_pm_runtime_get(dev);
  58
  59         if ((pos & 1) && cnt) {
  60                 unsigned char val;
  61                 pci_user_read_config_byte(dev, pos, &val);
  62                 __put_user(val, buf);
  63                 buf++;
  64                 pos++;
  65                 cnt--;
  66         }
  67
  68         if ((pos & 3) && cnt > 2) {
  69                 unsigned short val;
  70                 pci_user_read_config_word(dev, pos, &val);
  71                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  72                 buf += 2;
  73                 pos += 2;
  74                 cnt -= 2;
  75         }
  76
  77         while (cnt >= 4) {
  78                 unsigned int val;
  79                 pci_user_read_config_dword(dev, pos, &val);
  80                 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
  81                 buf += 4;
  82                 pos += 4;
  83                 cnt -= 4;
  84         }
  85
  86         if (cnt >= 2) {
  87                 unsigned short val;
  88                 pci_user_read_config_word(dev, pos, &val);
  89                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  90                 buf += 2;
  91                 pos += 2;
  92                 cnt -= 2;
  93         }
  94
  95         if (cnt) {
  96                 unsigned char val;
  97                 pci_user_read_config_byte(dev, pos, &val);
  98                 __put_user(val, buf);
  99                 buf++;
 100                 pos++;
 101                 cnt--;
 102         }
 103
 104         pci_config_pm_runtime_put(dev);
 105
 106         *ppos = pos;
 107         return nbytes;
 108 }
 109
 110 static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
 111                                   size_t nbytes, loff_t *ppos)
 112 {
 113         struct inode *ino = file_inode(file);
 114         struct pci_dev *dev = PDE_DATA(ino);
 115         int pos = *ppos;
 116         int size = dev->cfg_size;
 117         int cnt;
 118
 119         if (secure_modules())
 120                 return -EPERM;
 121
 122         if (pos >= size)
 123                 return 0;
 124         if (nbytes >= size)
 125                 nbytes = size;
 126         if (pos + nbytes > size)
 127                 nbytes = size - pos;
 128         cnt = nbytes;
 129
 130         if (!access_ok(VERIFY_READ, buf, cnt))
 131                 return -EINVAL;
 132
 133         pci_config_pm_runtime_get(dev);
 134
 135         if ((pos & 1) && cnt) {
 136                 unsigned char val;
 137                 __get_user(val, buf);
 138                 pci_user_write_config_byte(dev, pos, val);
 139                 buf++;
 140                 pos++;
 141                 cnt--;
 142         }
 143
 144         if ((pos & 3) && cnt > 2) {
 145                 __le16 val;
 146                 __get_user(val, (__le16 __user *) buf);
 147                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 148                 buf += 2;
 149                 pos += 2;
 150                 cnt -= 2;
 151         }
 152
 153         while (cnt >= 4) {
 154                 __le32 val;
 155                 __get_user(val, (__le32 __user *) buf);
 156                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 157                 buf += 4;
 158                 pos += 4;
 159                 cnt -= 4;
 160         }
 161
 162         if (cnt >= 2) {
 163                 __le16 val;
 164                 __get_user(val, (__le16 __user *) buf);
 165                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 166                 buf += 2;
 167                 pos += 2;
 168                 cnt -= 2;
 169         }
 170
 171         if (cnt) {
 172                 unsigned char val;
 173                 __get_user(val, buf);
 174                 pci_user_write_config_byte(dev, pos, val);
 175                 buf++;
 176                 pos++;
 177                 cnt--;
 178         }
 179
 180         pci_config_pm_runtime_put(dev);
 181
 182         *ppos = pos;
 183         i_size_write(ino, dev->cfg_size);
 184         return nbytes;
 185 }
 186
 187 struct pci_filp_private {
 188         enum pci_mmap_state mmap_state;
 189         int write_combine;
 190 };
 191
 192 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 193                                unsigned long arg)
 194 {
 195         struct pci_dev *dev = PDE_DATA(file_inode(file));
 196 #ifdef HAVE_PCI_MMAP
 197         struct pci_filp_private *fpriv = file->private_data;
 198 #endif /* HAVE_PCI_MMAP */
 199         int ret = 0;
 200
 201         if (secure_modules())
 202                 return -EPERM;
 203
 204         switch (cmd) {
 205         case PCIIOC_CONTROLLER:
 206                 ret = pci_domain_nr(dev->bus);
 207                 break;
 208
 209 #ifdef HAVE_PCI_MMAP
 210         case PCIIOC_MMAP_IS_IO:
 211                 fpriv->mmap_state = pci_mmap_io;
 212                 break;
 213
 214         case PCIIOC_MMAP_IS_MEM:
 215                 fpriv->mmap_state = pci_mmap_mem;
 216                 break;
 217
 218         case PCIIOC_WRITE_COMBINE:
 219                 if (arg)
 220                         fpriv->write_combine = 1;
 221                 else
 222                         fpriv->write_combine = 0;
 223                 break;
 224
 225 #endif /* HAVE_PCI_MMAP */
 226
 227         default:
 228                 ret = -EINVAL;
 229                 break;
 230         }
 231
 232         return ret;
 233 }
 234
 235 #ifdef HAVE_PCI_MMAP
 236 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 237 {
 238         struct pci_dev *dev = PDE_DATA(file_inode(file));
 239         struct pci_filp_private *fpriv = file->private_data;
 240         int i, ret, write_combine;
 241
 242         if (!capable(CAP_SYS_RAWIO) || secure_modules())
 243                 return -EPERM;
 244
 245         /* Make sure the caller is mapping a real resource for this device */
 246         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 247                 if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 248                         break;
 249         }
 250
 251         if (i >= PCI_ROM_RESOURCE)
 252                 return -ENODEV;
 253
 254         if (fpriv->mmap_state == pci_mmap_mem)
 255                 write_combine = fpriv->write_combine;
 256         else
 257                 write_combine = 0;
 258         ret = pci_mmap_page_range(dev, vma,
 259                                   fpriv->mmap_state, write_combine);
 260         if (ret < 0)
 261                 return ret;
 262
 263         return 0;
 264 }
 265
 266 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 267 {
 268         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 269
 270         if (!fpriv)
 271                 return -ENOMEM;
 272
 273         fpriv->mmap_state = pci_mmap_io;
 274         fpriv->write_combine = 0;
 275
 276         file->private_data = fpriv;
 277
 278         return 0;
 279 }
 280
 281 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 282 {
 283         kfree(file->private_data);
 284         file->private_data = NULL;
 285
 286         return 0;
 287 }
 288 #endif /* HAVE_PCI_MMAP */
 289
 290 static const struct file_operations proc_bus_pci_operations = {
 291         .owner          = THIS_MODULE,
 292         .llseek         = proc_bus_pci_lseek,
 293         .read           = proc_bus_pci_read,
 294         .write          = proc_bus_pci_write,
 295         .unlocked_ioctl = proc_bus_pci_ioctl,
 296         .compat_ioctl   = proc_bus_pci_ioctl,
 297 #ifdef HAVE_PCI_MMAP
 298         .open           = proc_bus_pci_open,
 299         .release        = proc_bus_pci_release,
 300         .mmap           = proc_bus_pci_mmap,
 301 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 302         .get_unmapped_area = get_pci_unmapped_area,
 303 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 304 #endif /* HAVE_PCI_MMAP */
 305 };
 306
 307 /* iterator */
 308 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 309 {
 310         struct pci_dev *dev = NULL;
 311         loff_t n = *pos;
 312
 313         for_each_pci_dev(dev) {
 314                 if (!n--)
 315                         break;
 316         }
 317         return dev;
 318 }
 319
 320 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 321 {
 322         struct pci_dev *dev = v;
 323
 324         (*pos)++;
 325         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 326         return dev;
 327 }
 328
 329 static void pci_seq_stop(struct seq_file *m, void *v)
 330 {
 331         if (v) {
 332                 struct pci_dev *dev = v;
 333                 pci_dev_put(dev);
 334         }
 335 }
 336
 337 static int show_device(struct seq_file *m, void *v)
 338 {
 339         const struct pci_dev *dev = v;
 340         const struct pci_driver *drv;
 341         int i;
 342
 343         if (dev == NULL)
 344                 return 0;
 345
 346         drv = pci_dev_driver(dev);
 347         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 348                         dev->bus->number,
 349                         dev->devfn,
 350                         dev->vendor,
 351                         dev->device,
 352                         dev->irq);
 353
 354         /* only print standard and ROM resources to preserve compatibility */
 355         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 356                 resource_size_t start, end;
 357                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 358                 seq_printf(m, "\t%16llx",
 359                         (unsigned long long)(start |
 360                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 361         }
 362         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 363                 resource_size_t start, end;
 364                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 365                 seq_printf(m, "\t%16llx",
 366                         dev->resource[i].start < dev->resource[i].end ?
 367                         (unsigned long long)(end - start) + 1 : 0);
 368         }
 369         seq_putc(m, '\t');
 370         if (drv)
 371                 seq_printf(m, "%s", drv->name);
 372         seq_putc(m, '\n');
 373         return 0;
 374 }
 375
 376 static const struct seq_operations proc_bus_pci_devices_op = {
 377         .start  = pci_seq_start,
 378         .next   = pci_seq_next,
 379         .stop   = pci_seq_stop,
 380         .show   = show_device
 381 };
 382
 383 static struct proc_dir_entry *proc_bus_pci_dir;
 384
 385 int pci_proc_attach_device(struct pci_dev *dev)
 386 {
 387         struct pci_bus *bus = dev->bus;
 388         struct proc_dir_entry *e;
 389         char name[16];
 390
 391         if (!proc_initialized)
 392                 return -EACCES;
 393
 394         if (!bus->procdir) {
 395                 if (pci_proc_domain(bus)) {
 396                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 397                                         bus->number);
 398                 } else {
 399                         sprintf(name, "%02x", bus->number);
 400                 }
 401                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 402                 if (!bus->procdir)
 403                         return -ENOMEM;
 404         }
 405
 406         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 407         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 408                              &proc_bus_pci_operations, dev);
 409         if (!e)
 410                 return -ENOMEM;
 411         proc_set_size(e, dev->cfg_size);
 412         dev->procent = e;
 413
 414         return 0;
 415 }
 416
 417 int pci_proc_detach_device(struct pci_dev *dev)
 418 {
 419         proc_remove(dev->procent);
 420         dev->procent = NULL;
 421         return 0;
 422 }
 423
 424 int pci_proc_detach_bus(struct pci_bus *bus)
 425 {
 426         proc_remove(bus->procdir);
 427         return 0;
 428 }
 429
 430 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 431 {
 432         return seq_open(file, &proc_bus_pci_devices_op);
 433 }
 434
 435 static const struct file_operations proc_bus_pci_dev_operations = {
 436         .owner          = THIS_MODULE,
 437         .open           = proc_bus_pci_dev_open,
 438         .read           = seq_read,
 439         .llseek         = seq_lseek,
 440         .release        = seq_release,
 441 };
 442
 443 static int __init pci_proc_init(void)
 444 {
 445         struct pci_dev *dev = NULL;
 446         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 447         proc_create("devices", 0, proc_bus_pci_dir,
 448                     &proc_bus_pci_dev_operations);
 449         proc_initialized = 1;
 450         for_each_pci_dev(dev)
 451                 pci_proc_attach_device(dev);
 452
 453         return 0;
 454 }
 455 device_initcall(pci_proc_init);