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 ret;
 256
 257         if (!capable(CAP_SYS_RAWIO))
 258                 return -EPERM;
 259
 260         ret = pci_mmap_page_range(dev, vma,
 261                                   fpriv->mmap_state,
 262                                   fpriv->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 #ifdef HAVE_PCI_MMAP
 300         .open           = proc_bus_pci_open,
 301         .release        = proc_bus_pci_release,
 302         .mmap           = proc_bus_pci_mmap,
 303 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 304         .get_unmapped_area = get_pci_unmapped_area,
 305 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 306 #endif /* HAVE_PCI_MMAP */
 307 };
 308
 309 /* iterator */
 310 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 311 {
 312         struct pci_dev *dev = NULL;
 313         loff_t n = *pos;
 314
 315         for_each_pci_dev(dev) {
 316                 if (!n--)
 317                         break;
 318         }
 319         return dev;
 320 }
 321
 322 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 323 {
 324         struct pci_dev *dev = v;
 325
 326         (*pos)++;
 327         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 328         return dev;
 329 }
 330
 331 static void pci_seq_stop(struct seq_file *m, void *v)
 332 {
 333         if (v) {
 334                 struct pci_dev *dev = v;
 335                 pci_dev_put(dev);
 336         }
 337 }
 338
 339 static int show_device(struct seq_file *m, void *v)
 340 {
 341         const struct pci_dev *dev = v;
 342         const struct pci_driver *drv;
 343         int i;
 344
 345         if (dev == NULL)
 346                 return 0;
 347
 348         drv = pci_dev_driver(dev);
 349         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 350                         dev->bus->number,
 351                         dev->devfn,
 352                         dev->vendor,
 353                         dev->device,
 354                         dev->irq);
 355         /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 356         for (i=0; i<7; i++) {
 357                 resource_size_t start, end;
 358                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 359                 seq_printf(m, "\t%16llx",
 360                         (unsigned long long)(start |
 361                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 362         }
 363         for (i=0; i<7; i++) {
 364                 resource_size_t start, end;
 365                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 366                 seq_printf(m, "\t%16llx",
 367                         dev->resource[i].start < dev->resource[i].end ?
 368                         (unsigned long long)(end - start) + 1 : 0);
 369         }
 370         seq_putc(m, '\t');
 371         if (drv)
 372                 seq_printf(m, "%s", drv->name);
 373         seq_putc(m, '\n');
 374         return 0;
 375 }
 376
 377 static const struct seq_operations proc_bus_pci_devices_op = {
 378         .start  = pci_seq_start,
 379         .next   = pci_seq_next,
 380         .stop   = pci_seq_stop,
 381         .show   = show_device
 382 };
 383
 384 static struct proc_dir_entry *proc_bus_pci_dir;
 385
 386 int pci_proc_attach_device(struct pci_dev *dev)
 387 {
 388         struct pci_bus *bus = dev->bus;
 389         struct proc_dir_entry *e;
 390         char name[16];
 391
 392         if (!proc_initialized)
 393                 return -EACCES;
 394
 395         if (!bus->procdir) {
 396                 if (pci_proc_domain(bus)) {
 397                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 398                                         bus->number);
 399                 } else {
 400                         sprintf(name, "%02x", bus->number);
 401                 }
 402                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 403                 if (!bus->procdir)
 404                         return -ENOMEM;
 405         }
 406
 407         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 408         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 409                              &proc_bus_pci_operations, dev);
 410         if (!e)
 411                 return -ENOMEM;
 412         e->size = dev->cfg_size;
 413         dev->procent = e;
 414
 415         return 0;
 416 }
 417
 418 int pci_proc_detach_device(struct pci_dev *dev)
 419 {
 420         struct proc_dir_entry *e;
 421
 422         if ((e = dev->procent)) {
 423                 if (atomic_read(&e->count) > 1)
 424                         return -EBUSY;
 425                 remove_proc_entry(e->name, dev->bus->procdir);
 426                 dev->procent = NULL;
 427         }
 428         return 0;
 429 }
 430
 431 #if 0
 432 int pci_proc_attach_bus(struct pci_bus* bus)
 433 {
 434         struct proc_dir_entry *de = bus->procdir;
 435
 436         if (!proc_initialized)
 437                 return -EACCES;
 438
 439         if (!de) {
 440                 char name[16];
 441                 sprintf(name, "%02x", bus->number);
 442                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 443                 if (!de)
 444                         return -ENOMEM;
 445         }
 446         return 0;
 447 }
 448 #endif  /*  0  */
 449
 450 int pci_proc_detach_bus(struct pci_bus* bus)
 451 {
 452         struct proc_dir_entry *de = bus->procdir;
 453         if (de)
 454                 remove_proc_entry(de->name, proc_bus_pci_dir);
 455         return 0;
 456 }
 457
 458 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 459 {
 460         return seq_open(file, &proc_bus_pci_devices_op);
 461 }
 462 static const struct file_operations proc_bus_pci_dev_operations = {
 463         .owner          = THIS_MODULE,
 464         .open           = proc_bus_pci_dev_open,
 465         .read           = seq_read,
 466         .llseek         = seq_lseek,
 467         .release        = seq_release,
 468 };
 469
 470 static int __init pci_proc_init(void)
 471 {
 472         struct pci_dev *dev = NULL;
 473         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 474         proc_create("devices", 0, proc_bus_pci_dir,
 475                     &proc_bus_pci_dev_operations);
 476         proc_initialized = 1;
 477         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 478                 pci_proc_attach_device(dev);
 479         }
 480         return 0;
 481 }
 482
 483 device_initcall(pci_proc_init);
 484