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/module.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/smp_lock.h>
  13 #include <linux/capability.h>
  14 #include <asm/uaccess.h>
  15 #include <asm/byteorder.h>
  16 #include "pci.h"
  17
  18 static int proc_initialized;    /* = 0 */
  19
  20 static loff_t
  21 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
  22 {
  23         loff_t new = -1;
  24         struct inode *inode = file->f_path.dentry->d_inode;
  25
  26         mutex_lock(&inode->i_mutex);
  27         switch (whence) {
  28         case 0:
  29                 new = off;
  30                 break;
  31         case 1:
  32                 new = file->f_pos + off;
  33                 break;
  34         case 2:
  35                 new = inode->i_size + off;
  36                 break;
  37         }
  38         if (new < 0 || new > inode->i_size)
  39                 new = -EINVAL;
  40         else
  41                 file->f_pos = new;
  42         mutex_unlock(&inode->i_mutex);
  43         return new;
  44 }
  45
  46 static ssize_t
  47 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  48 {
  49         const struct inode *ino = file->f_path.dentry->d_inode;
  50         const struct proc_dir_entry *dp = PDE(ino);
  51         struct pci_dev *dev = dp->data;
  52         unsigned int pos = *ppos;
  53         unsigned int cnt, size;
  54
  55         /*
  56          * Normal users can read only the standardized portion of the
  57          * configuration space as several chips lock up when trying to read
  58          * undefined locations (think of Intel PIIX4 as a typical example).
  59          */
  60
  61         if (capable(CAP_SYS_ADMIN))
  62                 size = dp->size;
  63         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  64                 size = 128;
  65         else
  66                 size = 64;
  67
  68         if (pos >= size)
  69                 return 0;
  70         if (nbytes >= size)
  71                 nbytes = size;
  72         if (pos + nbytes > size)
  73                 nbytes = size - pos;
  74         cnt = nbytes;
  75
  76         if (!access_ok(VERIFY_WRITE, buf, cnt))
  77                 return -EINVAL;
  78
  79         if ((pos & 1) && cnt) {
  80                 unsigned char val;
  81                 pci_user_read_config_byte(dev, pos, &val);
  82                 __put_user(val, buf);
  83                 buf++;
  84                 pos++;
  85                 cnt--;
  86         }
  87
  88         if ((pos & 3) && cnt > 2) {
  89                 unsigned short val;
  90                 pci_user_read_config_word(dev, pos, &val);
  91                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  92                 buf += 2;
  93                 pos += 2;
  94                 cnt -= 2;
  95         }
  96
  97         while (cnt >= 4) {
  98                 unsigned int val;
  99                 pci_user_read_config_dword(dev, pos, &val);
 100                 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
 101                 buf += 4;
 102                 pos += 4;
 103                 cnt -= 4;
 104         }
 105
 106         if (cnt >= 2) {
 107                 unsigned short val;
 108                 pci_user_read_config_word(dev, pos, &val);
 109                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
 110                 buf += 2;
 111                 pos += 2;
 112                 cnt -= 2;
 113         }
 114
 115         if (cnt) {
 116                 unsigned char val;
 117                 pci_user_read_config_byte(dev, pos, &val);
 118                 __put_user(val, buf);
 119                 buf++;
 120                 pos++;
 121                 cnt--;
 122         }
 123
 124         *ppos = pos;
 125         return nbytes;
 126 }
 127
 128 static ssize_t
 129 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 130 {
 131         struct inode *ino = file->f_path.dentry->d_inode;
 132         const struct proc_dir_entry *dp = PDE(ino);
 133         struct pci_dev *dev = dp->data;
 134         int pos = *ppos;
 135         int size = dp->size;
 136         int cnt;
 137
 138         if (pos >= size)
 139                 return 0;
 140         if (nbytes >= size)
 141                 nbytes = size;
 142         if (pos + nbytes > size)
 143                 nbytes = size - pos;
 144         cnt = nbytes;
 145
 146         if (!access_ok(VERIFY_READ, buf, cnt))
 147                 return -EINVAL;
 148
 149         if ((pos & 1) && cnt) {
 150                 unsigned char val;
 151                 __get_user(val, buf);
 152                 pci_user_write_config_byte(dev, pos, val);
 153                 buf++;
 154                 pos++;
 155                 cnt--;
 156         }
 157
 158         if ((pos & 3) && cnt > 2) {
 159                 __le16 val;
 160                 __get_user(val, (__le16 __user *) buf);
 161                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 162                 buf += 2;
 163                 pos += 2;
 164                 cnt -= 2;
 165         }
 166
 167         while (cnt >= 4) {
 168                 __le32 val;
 169                 __get_user(val, (__le32 __user *) buf);
 170                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 171                 buf += 4;
 172                 pos += 4;
 173                 cnt -= 4;
 174         }
 175
 176         if (cnt >= 2) {
 177                 __le16 val;
 178                 __get_user(val, (__le16 __user *) buf);
 179                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 180                 buf += 2;
 181                 pos += 2;
 182                 cnt -= 2;
 183         }
 184
 185         if (cnt) {
 186                 unsigned char val;
 187                 __get_user(val, buf);
 188                 pci_user_write_config_byte(dev, pos, val);
 189                 buf++;
 190                 pos++;
 191                 cnt--;
 192         }
 193
 194         *ppos = pos;
 195         i_size_write(ino, dp->size);
 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 long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 205                                unsigned long arg)
 206 {
 207         const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
 208         struct pci_dev *dev = dp->data;
 209 #ifdef HAVE_PCI_MMAP
 210         struct pci_filp_private *fpriv = file->private_data;
 211 #endif /* HAVE_PCI_MMAP */
 212         int ret = 0;
 213
 214         lock_kernel();
 215
 216         switch (cmd) {
 217         case PCIIOC_CONTROLLER:
 218                 ret = pci_domain_nr(dev->bus);
 219                 break;
 220
 221 #ifdef HAVE_PCI_MMAP
 222         case PCIIOC_MMAP_IS_IO:
 223                 fpriv->mmap_state = pci_mmap_io;
 224                 break;
 225
 226         case PCIIOC_MMAP_IS_MEM:
 227                 fpriv->mmap_state = pci_mmap_mem;
 228                 break;
 229
 230         case PCIIOC_WRITE_COMBINE:
 231                 if (arg)
 232                         fpriv->write_combine = 1;
 233                 else
 234                         fpriv->write_combine = 0;
 235                 break;
 236
 237 #endif /* HAVE_PCI_MMAP */
 238
 239         default:
 240                 ret = -EINVAL;
 241                 break;
 242         };
 243
 244         unlock_kernel();
 245         return ret;
 246 }
 247
 248 #ifdef HAVE_PCI_MMAP
 249 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 250 {
 251         struct inode *inode = file->f_path.dentry->d_inode;
 252         const struct proc_dir_entry *dp = PDE(inode);
 253         struct pci_dev *dev = dp->data;
 254         struct pci_filp_private *fpriv = file->private_data;
 255         int i, ret;
 256
 257         if (!capable(CAP_SYS_RAWIO))
 258                 return -EPERM;
 259
 260         /* Make sure the caller is mapping a real resource for this device */
 261         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 262                 if (pci_mmap_fits(dev, i, vma))
 263                         break;
 264         }
 265
 266         if (i >= PCI_ROM_RESOURCE)
 267                 return -ENODEV;
 268
 269         ret = pci_mmap_page_range(dev, vma,
 270                                   fpriv->mmap_state,
 271                                   fpriv->write_combine);
 272         if (ret < 0)
 273                 return ret;
 274
 275         return 0;
 276 }
 277
 278 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 279 {
 280         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 281
 282         if (!fpriv)
 283                 return -ENOMEM;
 284
 285         fpriv->mmap_state = pci_mmap_io;
 286         fpriv->write_combine = 0;
 287
 288         file->private_data = fpriv;
 289
 290         return 0;
 291 }
 292
 293 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 294 {
 295         kfree(file->private_data);
 296         file->private_data = NULL;
 297
 298         return 0;
 299 }
 300 #endif /* HAVE_PCI_MMAP */
 301
 302 static const struct file_operations proc_bus_pci_operations = {
 303         .owner          = THIS_MODULE,
 304         .llseek         = proc_bus_pci_lseek,
 305         .read           = proc_bus_pci_read,
 306         .write          = proc_bus_pci_write,
 307         .unlocked_ioctl = proc_bus_pci_ioctl,
 308 #ifdef HAVE_PCI_MMAP
 309         .open           = proc_bus_pci_open,
 310         .release        = proc_bus_pci_release,
 311         .mmap           = proc_bus_pci_mmap,
 312 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 313         .get_unmapped_area = get_pci_unmapped_area,
 314 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 315 #endif /* HAVE_PCI_MMAP */
 316 };
 317
 318 /* iterator */
 319 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 320 {
 321         struct pci_dev *dev = NULL;
 322         loff_t n = *pos;
 323
 324         for_each_pci_dev(dev) {
 325                 if (!n--)
 326                         break;
 327         }
 328         return dev;
 329 }
 330
 331 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 332 {
 333         struct pci_dev *dev = v;
 334
 335         (*pos)++;
 336         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 337         return dev;
 338 }
 339
 340 static void pci_seq_stop(struct seq_file *m, void *v)
 341 {
 342         if (v) {
 343                 struct pci_dev *dev = v;
 344                 pci_dev_put(dev);
 345         }
 346 }
 347
 348 static int show_device(struct seq_file *m, void *v)
 349 {
 350         const struct pci_dev *dev = v;
 351         const struct pci_driver *drv;
 352         int i;
 353
 354         if (dev == NULL)
 355                 return 0;
 356
 357         drv = pci_dev_driver(dev);
 358         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 359                         dev->bus->number,
 360                         dev->devfn,
 361                         dev->vendor,
 362                         dev->device,
 363                         dev->irq);
 364
 365         /* only print standard and ROM resources to preserve compatibility */
 366         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 367                 resource_size_t start, end;
 368                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 369                 seq_printf(m, "\t%16llx",
 370                         (unsigned long long)(start |
 371                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 372         }
 373         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 374                 resource_size_t start, end;
 375                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 376                 seq_printf(m, "\t%16llx",
 377                         dev->resource[i].start < dev->resource[i].end ?
 378                         (unsigned long long)(end - start) + 1 : 0);
 379         }
 380         seq_putc(m, '\t');
 381         if (drv)
 382                 seq_printf(m, "%s", drv->name);
 383         seq_putc(m, '\n');
 384         return 0;
 385 }
 386
 387 static const struct seq_operations proc_bus_pci_devices_op = {
 388         .start  = pci_seq_start,
 389         .next   = pci_seq_next,
 390         .stop   = pci_seq_stop,
 391         .show   = show_device
 392 };
 393
 394 static struct proc_dir_entry *proc_bus_pci_dir;
 395
 396 int pci_proc_attach_device(struct pci_dev *dev)
 397 {
 398         struct pci_bus *bus = dev->bus;
 399         struct proc_dir_entry *e;
 400         char name[16];
 401
 402         if (!proc_initialized)
 403                 return -EACCES;
 404
 405         if (!bus->procdir) {
 406                 if (pci_proc_domain(bus)) {
 407                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 408                                         bus->number);
 409                 } else {
 410                         sprintf(name, "%02x", bus->number);
 411                 }
 412                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 413                 if (!bus->procdir)
 414                         return -ENOMEM;
 415         }
 416
 417         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 418         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 419                              &proc_bus_pci_operations, dev);
 420         if (!e)
 421                 return -ENOMEM;
 422         e->size = dev->cfg_size;
 423         dev->procent = e;
 424
 425         return 0;
 426 }
 427
 428 int pci_proc_detach_device(struct pci_dev *dev)
 429 {
 430         struct proc_dir_entry *e;
 431
 432         if ((e = dev->procent)) {
 433                 if (atomic_read(&e->count) > 1)
 434                         return -EBUSY;
 435                 remove_proc_entry(e->name, dev->bus->procdir);
 436                 dev->procent = NULL;
 437         }
 438         return 0;
 439 }
 440
 441 #if 0
 442 int pci_proc_attach_bus(struct pci_bus* bus)
 443 {
 444         struct proc_dir_entry *de = bus->procdir;
 445
 446         if (!proc_initialized)
 447                 return -EACCES;
 448
 449         if (!de) {
 450                 char name[16];
 451                 sprintf(name, "%02x", bus->number);
 452                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 453                 if (!de)
 454                         return -ENOMEM;
 455         }
 456         return 0;
 457 }
 458 #endif  /*  0  */
 459
 460 int pci_proc_detach_bus(struct pci_bus* bus)
 461 {
 462         struct proc_dir_entry *de = bus->procdir;
 463         if (de)
 464                 remove_proc_entry(de->name, proc_bus_pci_dir);
 465         return 0;
 466 }
 467
 468 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 469 {
 470         return seq_open(file, &proc_bus_pci_devices_op);
 471 }
 472 static const struct file_operations proc_bus_pci_dev_operations = {
 473         .owner          = THIS_MODULE,
 474         .open           = proc_bus_pci_dev_open,
 475         .read           = seq_read,
 476         .llseek         = seq_lseek,
 477         .release        = seq_release,
 478 };
 479
 480 static int __init pci_proc_init(void)
 481 {
 482         struct pci_dev *dev = NULL;
 483         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 484         proc_create("devices", 0, proc_bus_pci_dir,
 485                     &proc_bus_pci_dev_operations);
 486         proc_initialized = 1;
 487         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 488                 pci_proc_attach_device(dev);
 489         }
 490         return 0;
 491 }
 492
 493 device_initcall(pci_proc_init);
 494