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/smp_lock.h>
  15 #include <linux/capability.h>
  16 #include <asm/uaccess.h>
  17 #include <asm/byteorder.h>
  18 #include "pci.h"
  19
  20 static int proc_initialized;    /* = 0 */
  21
  22 static loff_t
  23 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
  24 {
  25         loff_t new = -1;
  26         struct inode *inode = file->f_path.dentry->d_inode;
  27
  28         mutex_lock(&inode->i_mutex);
  29         switch (whence) {
  30         case 0:
  31                 new = off;
  32                 break;
  33         case 1:
  34                 new = file->f_pos + off;
  35                 break;
  36         case 2:
  37                 new = inode->i_size + off;
  38                 break;
  39         }
  40         if (new < 0 || new > inode->i_size)
  41                 new = -EINVAL;
  42         else
  43                 file->f_pos = new;
  44         mutex_unlock(&inode->i_mutex);
  45         return new;
  46 }
  47
  48 static ssize_t
  49 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  50 {
  51         const struct inode *ino = file->f_path.dentry->d_inode;
  52         const struct proc_dir_entry *dp = PDE(ino);
  53         struct pci_dev *dev = dp->data;
  54         unsigned int pos = *ppos;
  55         unsigned int cnt, size;
  56
  57         /*
  58          * Normal users can read only the standardized portion of the
  59          * configuration space as several chips lock up when trying to read
  60          * undefined locations (think of Intel PIIX4 as a typical example).
  61          */
  62
  63         if (capable(CAP_SYS_ADMIN))
  64                 size = dp->size;
  65         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  66                 size = 128;
  67         else
  68                 size = 64;
  69
  70         if (pos >= size)
  71                 return 0;
  72         if (nbytes >= size)
  73                 nbytes = size;
  74         if (pos + nbytes > size)
  75                 nbytes = size - pos;
  76         cnt = nbytes;
  77
  78         if (!access_ok(VERIFY_WRITE, buf, cnt))
  79                 return -EINVAL;
  80
  81         if ((pos & 1) && cnt) {
  82                 unsigned char val;
  83                 pci_user_read_config_byte(dev, pos, &val);
  84                 __put_user(val, buf);
  85                 buf++;
  86                 pos++;
  87                 cnt--;
  88         }
  89
  90         if ((pos & 3) && cnt > 2) {
  91                 unsigned short val;
  92                 pci_user_read_config_word(dev, pos, &val);
  93                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
  94                 buf += 2;
  95                 pos += 2;
  96                 cnt -= 2;
  97         }
  98
  99         while (cnt >= 4) {
 100                 unsigned int val;
 101                 pci_user_read_config_dword(dev, pos, &val);
 102                 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
 103                 buf += 4;
 104                 pos += 4;
 105                 cnt -= 4;
 106         }
 107
 108         if (cnt >= 2) {
 109                 unsigned short val;
 110                 pci_user_read_config_word(dev, pos, &val);
 111                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
 112                 buf += 2;
 113                 pos += 2;
 114                 cnt -= 2;
 115         }
 116
 117         if (cnt) {
 118                 unsigned char val;
 119                 pci_user_read_config_byte(dev, pos, &val);
 120                 __put_user(val, buf);
 121                 buf++;
 122                 pos++;
 123                 cnt--;
 124         }
 125
 126         *ppos = pos;
 127         return nbytes;
 128 }
 129
 130 static ssize_t
 131 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 132 {
 133         struct inode *ino = file->f_path.dentry->d_inode;
 134         const struct proc_dir_entry *dp = PDE(ino);
 135         struct pci_dev *dev = dp->data;
 136         int pos = *ppos;
 137         int size = dp->size;
 138         int cnt;
 139
 140         if (pos >= size)
 141                 return 0;
 142         if (nbytes >= size)
 143                 nbytes = size;
 144         if (pos + nbytes > size)
 145                 nbytes = size - pos;
 146         cnt = nbytes;
 147
 148         if (!access_ok(VERIFY_READ, buf, cnt))
 149                 return -EINVAL;
 150
 151         if ((pos & 1) && cnt) {
 152                 unsigned char val;
 153                 __get_user(val, buf);
 154                 pci_user_write_config_byte(dev, pos, val);
 155                 buf++;
 156                 pos++;
 157                 cnt--;
 158         }
 159
 160         if ((pos & 3) && cnt > 2) {
 161                 unsigned short val;
 162                 __get_user(val, (unsigned short __user *) buf);
 163                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 164                 buf += 2;
 165                 pos += 2;
 166                 cnt -= 2;
 167         }
 168
 169         while (cnt >= 4) {
 170                 unsigned int val;
 171                 __get_user(val, (unsigned int __user *) buf);
 172                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 173                 buf += 4;
 174                 pos += 4;
 175                 cnt -= 4;
 176         }
 177
 178         if (cnt >= 2) {
 179                 unsigned short val;
 180                 __get_user(val, (unsigned short __user *) buf);
 181                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 182                 buf += 2;
 183                 pos += 2;
 184                 cnt -= 2;
 185         }
 186
 187         if (cnt) {
 188                 unsigned char val;
 189                 __get_user(val, buf);
 190                 pci_user_write_config_byte(dev, pos, val);
 191                 buf++;
 192                 pos++;
 193                 cnt--;
 194         }
 195
 196         *ppos = pos;
 197         i_size_write(ino, dp->size);
 198         return nbytes;
 199 }
 200
 201 struct pci_filp_private {
 202         enum pci_mmap_state mmap_state;
 203         int write_combine;
 204 };
 205
 206 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 207                                unsigned long arg)
 208 {
 209         const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
 210         struct pci_dev *dev = dp->data;
 211 #ifdef HAVE_PCI_MMAP
 212         struct pci_filp_private *fpriv = file->private_data;
 213 #endif /* HAVE_PCI_MMAP */
 214         int ret = 0;
 215
 216         lock_kernel();
 217
 218         switch (cmd) {
 219         case PCIIOC_CONTROLLER:
 220                 ret = pci_domain_nr(dev->bus);
 221                 break;
 222
 223 #ifdef HAVE_PCI_MMAP
 224         case PCIIOC_MMAP_IS_IO:
 225                 fpriv->mmap_state = pci_mmap_io;
 226                 break;
 227
 228         case PCIIOC_MMAP_IS_MEM:
 229                 fpriv->mmap_state = pci_mmap_mem;
 230                 break;
 231
 232         case PCIIOC_WRITE_COMBINE:
 233                 if (arg)
 234                         fpriv->write_combine = 1;
 235                 else
 236                         fpriv->write_combine = 0;
 237                 break;
 238
 239 #endif /* HAVE_PCI_MMAP */
 240
 241         default:
 242                 ret = -EINVAL;
 243                 break;
 244         };
 245
 246         unlock_kernel();
 247         return ret;
 248 }
 249
 250 #ifdef HAVE_PCI_MMAP
 251 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 252 {
 253         struct inode *inode = file->f_path.dentry->d_inode;
 254         const struct proc_dir_entry *dp = PDE(inode);
 255         struct pci_dev *dev = dp->data;
 256         struct pci_filp_private *fpriv = file->private_data;
 257         int ret;
 258
 259         if (!capable(CAP_SYS_RAWIO))
 260                 return -EPERM;
 261
 262         ret = pci_mmap_page_range(dev, vma,
 263                                   fpriv->mmap_state,
 264                                   fpriv->write_combine);
 265         if (ret < 0)
 266                 return ret;
 267
 268         return 0;
 269 }
 270
 271 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 272 {
 273         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 274
 275         if (!fpriv)
 276                 return -ENOMEM;
 277
 278         fpriv->mmap_state = pci_mmap_io;
 279         fpriv->write_combine = 0;
 280
 281         file->private_data = fpriv;
 282
 283         return 0;
 284 }
 285
 286 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 287 {
 288         kfree(file->private_data);
 289         file->private_data = NULL;
 290
 291         return 0;
 292 }
 293 #endif /* HAVE_PCI_MMAP */
 294
 295 static const struct file_operations proc_bus_pci_operations = {
 296         .owner          = THIS_MODULE,
 297         .llseek         = proc_bus_pci_lseek,
 298         .read           = proc_bus_pci_read,
 299         .write          = proc_bus_pci_write,
 300         .unlocked_ioctl = proc_bus_pci_ioctl,
 301 #ifdef HAVE_PCI_MMAP
 302         .open           = proc_bus_pci_open,
 303         .release        = proc_bus_pci_release,
 304         .mmap           = proc_bus_pci_mmap,
 305 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 306         .get_unmapped_area = get_pci_unmapped_area,
 307 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 308 #endif /* HAVE_PCI_MMAP */
 309 };
 310
 311 /* iterator */
 312 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 313 {
 314         struct pci_dev *dev = NULL;
 315         loff_t n = *pos;
 316
 317         for_each_pci_dev(dev) {
 318                 if (!n--)
 319                         break;
 320         }
 321         return dev;
 322 }
 323
 324 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 325 {
 326         struct pci_dev *dev = v;
 327
 328         (*pos)++;
 329         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 330         return dev;
 331 }
 332
 333 static void pci_seq_stop(struct seq_file *m, void *v)
 334 {
 335         if (v) {
 336                 struct pci_dev *dev = v;
 337                 pci_dev_put(dev);
 338         }
 339 }
 340
 341 static int show_device(struct seq_file *m, void *v)
 342 {
 343         const struct pci_dev *dev = v;
 344         const struct pci_driver *drv;
 345         int i;
 346
 347         if (dev == NULL)
 348                 return 0;
 349
 350         drv = pci_dev_driver(dev);
 351         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 352                         dev->bus->number,
 353                         dev->devfn,
 354                         dev->vendor,
 355                         dev->device,
 356                         dev->irq);
 357         /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 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                         (unsigned long long)(start |
 363                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 364         }
 365         for (i=0; i<7; 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         e->size = 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         struct proc_dir_entry *e;
 423
 424         if ((e = dev->procent)) {
 425                 if (atomic_read(&e->count) > 1)
 426                         return -EBUSY;
 427                 remove_proc_entry(e->name, dev->bus->procdir);
 428                 dev->procent = NULL;
 429         }
 430         return 0;
 431 }
 432
 433 #if 0
 434 int pci_proc_attach_bus(struct pci_bus* bus)
 435 {
 436         struct proc_dir_entry *de = bus->procdir;
 437
 438         if (!proc_initialized)
 439                 return -EACCES;
 440
 441         if (!de) {
 442                 char name[16];
 443                 sprintf(name, "%02x", bus->number);
 444                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 445                 if (!de)
 446                         return -ENOMEM;
 447         }
 448         return 0;
 449 }
 450 #endif  /*  0  */
 451
 452 int pci_proc_detach_bus(struct pci_bus* bus)
 453 {
 454         struct proc_dir_entry *de = bus->procdir;
 455         if (de)
 456                 remove_proc_entry(de->name, proc_bus_pci_dir);
 457         return 0;
 458 }
 459
 460 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 461 {
 462         return seq_open(file, &proc_bus_pci_devices_op);
 463 }
 464 static const struct file_operations proc_bus_pci_dev_operations = {
 465         .owner          = THIS_MODULE,
 466         .open           = proc_bus_pci_dev_open,
 467         .read           = seq_read,
 468         .llseek         = seq_lseek,
 469         .release        = seq_release,
 470 };
 471
 472 static int __init pci_proc_init(void)
 473 {
 474         struct pci_dev *dev = NULL;
 475         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 476         proc_create("devices", 0, proc_bus_pci_dir,
 477                     &proc_bus_pci_dev_operations);
 478         proc_initialized = 1;
 479         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 480                 pci_proc_attach_device(dev);
 481         }
 482         return 0;
 483 }
 484
 485 __initcall(pci_proc_init);
 486