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 (pos >= size)
 120                 return 0;
 121         if (nbytes >= size)
 122                 nbytes = size;
 123         if (pos + nbytes > size)
 124                 nbytes = size - pos;
 125         cnt = nbytes;
 126
 127         if (!access_ok(VERIFY_READ, buf, cnt))
 128                 return -EINVAL;
 129
 130         pci_config_pm_runtime_get(dev);
 131
 132         if ((pos & 1) && cnt) {
 133                 unsigned char val;
 134                 __get_user(val, buf);
 135                 pci_user_write_config_byte(dev, pos, val);
 136                 buf++;
 137                 pos++;
 138                 cnt--;
 139         }
 140
 141         if ((pos & 3) && cnt > 2) {
 142                 __le16 val;
 143                 __get_user(val, (__le16 __user *) buf);
 144                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 145                 buf += 2;
 146                 pos += 2;
 147                 cnt -= 2;
 148         }
 149
 150         while (cnt >= 4) {
 151                 __le32 val;
 152                 __get_user(val, (__le32 __user *) buf);
 153                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 154                 buf += 4;
 155                 pos += 4;
 156                 cnt -= 4;
 157         }
 158
 159         if (cnt >= 2) {
 160                 __le16 val;
 161                 __get_user(val, (__le16 __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         if (cnt) {
 169                 unsigned char val;
 170                 __get_user(val, buf);
 171                 pci_user_write_config_byte(dev, pos, val);
 172                 buf++;
 173                 pos++;
 174                 cnt--;
 175         }
 176
 177         pci_config_pm_runtime_put(dev);
 178
 179         *ppos = pos;
 180         i_size_write(ino, dev->cfg_size);
 181         return nbytes;
 182 }
 183
 184 struct pci_filp_private {
 185         enum pci_mmap_state mmap_state;
 186         int write_combine;
 187 };
 188
 189 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 190                                unsigned long arg)
 191 {
 192         struct pci_dev *dev = PDE_DATA(file_inode(file));
 193 #ifdef HAVE_PCI_MMAP
 194         struct pci_filp_private *fpriv = file->private_data;
 195 #endif /* HAVE_PCI_MMAP */
 196         int ret = 0;
 197
 198         switch (cmd) {
 199         case PCIIOC_CONTROLLER:
 200                 ret = pci_domain_nr(dev->bus);
 201                 break;
 202
 203 #ifdef HAVE_PCI_MMAP
 204         case PCIIOC_MMAP_IS_IO:
 205                 fpriv->mmap_state = pci_mmap_io;
 206                 break;
 207
 208         case PCIIOC_MMAP_IS_MEM:
 209                 fpriv->mmap_state = pci_mmap_mem;
 210                 break;
 211
 212         case PCIIOC_WRITE_COMBINE:
 213                 if (arg)
 214                         fpriv->write_combine = 1;
 215                 else
 216                         fpriv->write_combine = 0;
 217                 break;
 218
 219 #endif /* HAVE_PCI_MMAP */
 220
 221         default:
 222                 ret = -EINVAL;
 223                 break;
 224         }
 225
 226         return ret;
 227 }
 228
 229 #ifdef HAVE_PCI_MMAP
 230 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 231 {
 232         struct pci_dev *dev = PDE_DATA(file_inode(file));
 233         struct pci_filp_private *fpriv = file->private_data;
 234         int i, ret, write_combine = 0, res_bit;
 235
 236         if (!capable(CAP_SYS_RAWIO))
 237                 return -EPERM;
 238
 239         if (fpriv->mmap_state == pci_mmap_io)
 240                 res_bit = IORESOURCE_IO;
 241         else
 242                 res_bit = IORESOURCE_MEM;
 243
 244         /* Make sure the caller is mapping a real resource for this device */
 245         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 246                 if (dev->resource[i].flags & res_bit &&
 247                     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             fpriv->write_combine) {
 256                 if (dev->resource[i].flags & IORESOURCE_PREFETCH)
 257                         write_combine = 1;
 258                 else
 259                         return -EINVAL;
 260         }
 261         ret = pci_mmap_page_range(dev, vma,
 262                                   fpriv->mmap_state, write_combine);
 263         if (ret < 0)
 264                 return ret;
 265
 266         return 0;
 267 }
 268
 269 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 270 {
 271         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 272
 273         if (!fpriv)
 274                 return -ENOMEM;
 275
 276         fpriv->mmap_state = pci_mmap_io;
 277         fpriv->write_combine = 0;
 278
 279         file->private_data = fpriv;
 280
 281         return 0;
 282 }
 283
 284 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 285 {
 286         kfree(file->private_data);
 287         file->private_data = NULL;
 288
 289         return 0;
 290 }
 291 #endif /* HAVE_PCI_MMAP */
 292
 293 static const struct file_operations proc_bus_pci_operations = {
 294         .owner          = THIS_MODULE,
 295         .llseek         = proc_bus_pci_lseek,
 296         .read           = proc_bus_pci_read,
 297         .write          = proc_bus_pci_write,
 298         .unlocked_ioctl = proc_bus_pci_ioctl,
 299         .compat_ioctl   = proc_bus_pci_ioctl,
 300 #ifdef HAVE_PCI_MMAP
 301         .open           = proc_bus_pci_open,
 302         .release        = proc_bus_pci_release,
 303         .mmap           = proc_bus_pci_mmap,
 304 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 305         .get_unmapped_area = get_pci_unmapped_area,
 306 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 307 #endif /* HAVE_PCI_MMAP */
 308 };
 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
 357         /* only print standard and ROM resources to preserve compatibility */
 358         for (i = 0; i <= PCI_ROM_RESOURCE; 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                         (unsigned long long)(start |
 363                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 364         }
 365         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 366                 resource_size_t start, end;
 367                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 368                 seq_printf(m, "\t%16llx",
 369                         dev->resource[i].start < dev->resource[i].end ?
 370                         (unsigned long long)(end - start) + 1 : 0);
 371         }
 372         seq_putc(m, '\t');
 373         if (drv)
 374                 seq_printf(m, "%s", drv->name);
 375         seq_putc(m, '\n');
 376         return 0;
 377 }
 378
 379 static const struct seq_operations proc_bus_pci_devices_op = {
 380         .start  = pci_seq_start,
 381         .next   = pci_seq_next,
 382         .stop   = pci_seq_stop,
 383         .show   = show_device
 384 };
 385
 386 static struct proc_dir_entry *proc_bus_pci_dir;
 387
 388 int pci_proc_attach_device(struct pci_dev *dev)
 389 {
 390         struct pci_bus *bus = dev->bus;
 391         struct proc_dir_entry *e;
 392         char name[16];
 393
 394         if (!proc_initialized)
 395                 return -EACCES;
 396
 397         if (!bus->procdir) {
 398                 if (pci_proc_domain(bus)) {
 399                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 400                                         bus->number);
 401                 } else {
 402                         sprintf(name, "%02x", bus->number);
 403                 }
 404                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 405                 if (!bus->procdir)
 406                         return -ENOMEM;
 407         }
 408
 409         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 410         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 411                              &proc_bus_pci_operations, dev);
 412         if (!e)
 413                 return -ENOMEM;
 414         proc_set_size(e, dev->cfg_size);
 415         dev->procent = e;
 416
 417         return 0;
 418 }
 419
 420 int pci_proc_detach_device(struct pci_dev *dev)
 421 {
 422         proc_remove(dev->procent);
 423         dev->procent = NULL;
 424         return 0;
 425 }
 426
 427 int pci_proc_detach_bus(struct pci_bus *bus)
 428 {
 429         proc_remove(bus->procdir);
 430         return 0;
 431 }
 432
 433 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 434 {
 435         return seq_open(file, &proc_bus_pci_devices_op);
 436 }
 437
 438 static const struct file_operations proc_bus_pci_dev_operations = {
 439         .owner          = THIS_MODULE,
 440         .open           = proc_bus_pci_dev_open,
 441         .read           = seq_read,
 442         .llseek         = seq_lseek,
 443         .release        = seq_release,
 444 };
 445
 446 static int __init pci_proc_init(void)
 447 {
 448         struct pci_dev *dev = NULL;
 449         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 450         proc_create("devices", 0, proc_bus_pci_dir,
 451                     &proc_bus_pci_dev_operations);
 452         proc_initialized = 1;
 453         for_each_pci_dev(dev)
 454                 pci_proc_attach_device(dev);
 455
 456         return 0;
 457 }
 458 device_initcall(pci_proc_init);