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/capability.h>
  15 #include <asm/uaccess.h>
  16 #include <asm/byteorder.h>
  17 #include "pci.h"
  18
  19 static int proc_initialized;    /* = 0 */
  20
  21 static loff_t
  22 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
  23 {
  24         loff_t new = -1;
  25         struct inode *inode = file->f_path.dentry->d_inode;
  26
  27         mutex_lock(&inode->i_mutex);
  28         switch (whence) {
  29         case 0:
  30                 new = off;
  31                 break;
  32         case 1:
  33                 new = file->f_pos + off;
  34                 break;
  35         case 2:
  36                 new = inode->i_size + off;
  37                 break;
  38         }
  39         if (new < 0 || new > inode->i_size)
  40                 new = -EINVAL;
  41         else
  42                 file->f_pos = new;
  43         mutex_unlock(&inode->i_mutex);
  44         return new;
  45 }
  46
  47 static ssize_t
  48 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  49 {
  50         const struct inode *ino = file->f_path.dentry->d_inode;
  51         const struct proc_dir_entry *dp = PDE(ino);
  52         struct pci_dev *dev = dp->data;
  53         unsigned int pos = *ppos;
  54         unsigned int cnt, size;
  55
  56         /*
  57          * Normal users can read only the standardized portion of the
  58          * configuration space as several chips lock up when trying to read
  59          * undefined locations (think of Intel PIIX4 as a typical example).
  60          */
  61
  62         if (capable(CAP_SYS_ADMIN))
  63                 size = dp->size;
  64         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  65                 size = 128;
  66         else
  67                 size = 64;
  68
  69         if (pos >= size)
  70                 return 0;
  71         if (nbytes >= size)
  72                 nbytes = size;
  73         if (pos + nbytes > size)
  74                 nbytes = size - pos;
  75         cnt = nbytes;
  76
  77         if (!access_ok(VERIFY_WRITE, buf, cnt))
  78                 return -EINVAL;
  79
  80         if ((pos & 1) && cnt) {
  81                 unsigned char val;
  82                 pci_user_read_config_byte(dev, pos, &val);
  83                 __put_user(val, buf);
  84                 buf++;
  85                 pos++;
  86                 cnt--;
  87         }
  88
  89         if ((pos & 3) && cnt > 2) {
  90                 unsigned short val;
  91                 pci_user_read_config_word(dev, pos, &val);
  92                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
  93                 buf += 2;
  94                 pos += 2;
  95                 cnt -= 2;
  96         }
  97
  98         while (cnt >= 4) {
  99                 unsigned int val;
 100                 pci_user_read_config_dword(dev, pos, &val);
 101                 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
 102                 buf += 4;
 103                 pos += 4;
 104                 cnt -= 4;
 105         }
 106
 107         if (cnt >= 2) {
 108                 unsigned short val;
 109                 pci_user_read_config_word(dev, pos, &val);
 110                 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
 111                 buf += 2;
 112                 pos += 2;
 113                 cnt -= 2;
 114         }
 115
 116         if (cnt) {
 117                 unsigned char val;
 118                 pci_user_read_config_byte(dev, pos, &val);
 119                 __put_user(val, buf);
 120                 buf++;
 121                 pos++;
 122                 cnt--;
 123         }
 124
 125         *ppos = pos;
 126         return nbytes;
 127 }
 128
 129 static ssize_t
 130 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 131 {
 132         struct inode *ino = file->f_path.dentry->d_inode;
 133         const struct proc_dir_entry *dp = PDE(ino);
 134         struct pci_dev *dev = dp->data;
 135         int pos = *ppos;
 136         int size = dp->size;
 137         int cnt;
 138
 139         if (pos >= size)
 140                 return 0;
 141         if (nbytes >= size)
 142                 nbytes = size;
 143         if (pos + nbytes > size)
 144                 nbytes = size - pos;
 145         cnt = nbytes;
 146
 147         if (!access_ok(VERIFY_READ, buf, cnt))
 148                 return -EINVAL;
 149
 150         if ((pos & 1) && cnt) {
 151                 unsigned char val;
 152                 __get_user(val, buf);
 153                 pci_user_write_config_byte(dev, pos, val);
 154                 buf++;
 155                 pos++;
 156                 cnt--;
 157         }
 158
 159         if ((pos & 3) && cnt > 2) {
 160                 unsigned short val;
 161                 __get_user(val, (unsigned short __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         while (cnt >= 4) {
 169                 unsigned int val;
 170                 __get_user(val, (unsigned int __user *) buf);
 171                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 172                 buf += 4;
 173                 pos += 4;
 174                 cnt -= 4;
 175         }
 176
 177         if (cnt >= 2) {
 178                 unsigned short val;
 179                 __get_user(val, (unsigned short __user *) buf);
 180                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 181                 buf += 2;
 182                 pos += 2;
 183                 cnt -= 2;
 184         }
 185
 186         if (cnt) {
 187                 unsigned char val;
 188                 __get_user(val, buf);
 189                 pci_user_write_config_byte(dev, pos, val);
 190                 buf++;
 191                 pos++;
 192                 cnt--;
 193         }
 194
 195         *ppos = pos;
 196         i_size_write(ino, dp->size);
 197         return nbytes;
 198 }
 199
 200 struct pci_filp_private {
 201         enum pci_mmap_state mmap_state;
 202         int write_combine;
 203 };
 204
 205 static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 206 {
 207         const struct proc_dir_entry *dp = PDE(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         switch (cmd) {
 215         case PCIIOC_CONTROLLER:
 216                 ret = pci_domain_nr(dev->bus);
 217                 break;
 218
 219 #ifdef HAVE_PCI_MMAP
 220         case PCIIOC_MMAP_IS_IO:
 221                 fpriv->mmap_state = pci_mmap_io;
 222                 break;
 223
 224         case PCIIOC_MMAP_IS_MEM:
 225                 fpriv->mmap_state = pci_mmap_mem;
 226                 break;
 227
 228         case PCIIOC_WRITE_COMBINE:
 229                 if (arg)
 230                         fpriv->write_combine = 1;
 231                 else
 232                         fpriv->write_combine = 0;
 233                 break;
 234
 235 #endif /* HAVE_PCI_MMAP */
 236
 237         default:
 238                 ret = -EINVAL;
 239                 break;
 240         };
 241
 242         return ret;
 243 }
 244
 245 #ifdef HAVE_PCI_MMAP
 246 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 247 {
 248         struct inode *inode = file->f_path.dentry->d_inode;
 249         const struct proc_dir_entry *dp = PDE(inode);
 250         struct pci_dev *dev = dp->data;
 251         struct pci_filp_private *fpriv = file->private_data;
 252         int ret;
 253
 254         if (!capable(CAP_SYS_RAWIO))
 255                 return -EPERM;
 256
 257         ret = pci_mmap_page_range(dev, vma,
 258                                   fpriv->mmap_state,
 259                                   fpriv->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         .llseek         = proc_bus_pci_lseek,
 292         .read           = proc_bus_pci_read,
 293         .write          = proc_bus_pci_write,
 294         .ioctl          = proc_bus_pci_ioctl,
 295 #ifdef HAVE_PCI_MMAP
 296         .open           = proc_bus_pci_open,
 297         .release        = proc_bus_pci_release,
 298         .mmap           = proc_bus_pci_mmap,
 299 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 300         .get_unmapped_area = get_pci_unmapped_area,
 301 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 302 #endif /* HAVE_PCI_MMAP */
 303 };
 304
 305 /* iterator */
 306 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 307 {
 308         struct pci_dev *dev = NULL;
 309         loff_t n = *pos;
 310
 311         for_each_pci_dev(dev) {
 312                 if (!n--)
 313                         break;
 314         }
 315         return dev;
 316 }
 317
 318 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 319 {
 320         struct pci_dev *dev = v;
 321
 322         (*pos)++;
 323         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 324         return dev;
 325 }
 326
 327 static void pci_seq_stop(struct seq_file *m, void *v)
 328 {
 329         if (v) {
 330                 struct pci_dev *dev = v;
 331                 pci_dev_put(dev);
 332         }
 333 }
 334
 335 static int show_device(struct seq_file *m, void *v)
 336 {
 337         const struct pci_dev *dev = v;
 338         const struct pci_driver *drv;
 339         int i;
 340
 341         if (dev == NULL)
 342                 return 0;
 343
 344         drv = pci_dev_driver(dev);
 345         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 346                         dev->bus->number,
 347                         dev->devfn,
 348                         dev->vendor,
 349                         dev->device,
 350                         dev->irq);
 351         /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 352         for (i=0; i<7; i++) {
 353                 resource_size_t start, end;
 354                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 355                 seq_printf(m, "\t%16llx",
 356                         (unsigned long long)(start |
 357                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 358         }
 359         for (i=0; i<7; i++) {
 360                 resource_size_t start, end;
 361                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 362                 seq_printf(m, "\t%16llx",
 363                         dev->resource[i].start < dev->resource[i].end ?
 364                         (unsigned long long)(end - start) + 1 : 0);
 365         }
 366         seq_putc(m, '\t');
 367         if (drv)
 368                 seq_printf(m, "%s", drv->name);
 369         seq_putc(m, '\n');
 370         return 0;
 371 }
 372
 373 static struct seq_operations proc_bus_pci_devices_op = {
 374         .start  = pci_seq_start,
 375         .next   = pci_seq_next,
 376         .stop   = pci_seq_stop,
 377         .show   = show_device
 378 };
 379
 380 static struct proc_dir_entry *proc_bus_pci_dir;
 381
 382 int pci_proc_attach_device(struct pci_dev *dev)
 383 {
 384         struct pci_bus *bus = dev->bus;
 385         struct proc_dir_entry *e;
 386         char name[16];
 387
 388         if (!proc_initialized)
 389                 return -EACCES;
 390
 391         if (!bus->procdir) {
 392                 if (pci_proc_domain(bus)) {
 393                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 394                                         bus->number);
 395                 } else {
 396                         sprintf(name, "%02x", bus->number);
 397                 }
 398                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 399                 if (!bus->procdir)
 400                         return -ENOMEM;
 401         }
 402
 403         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 404         e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
 405         if (!e)
 406                 return -ENOMEM;
 407         e->proc_fops = &proc_bus_pci_operations;
 408         e->data = dev;
 409         e->size = dev->cfg_size;
 410         dev->procent = e;
 411
 412         return 0;
 413 }
 414
 415 int pci_proc_detach_device(struct pci_dev *dev)
 416 {
 417         struct proc_dir_entry *e;
 418
 419         if ((e = dev->procent)) {
 420                 if (atomic_read(&e->count))
 421                         return -EBUSY;
 422                 remove_proc_entry(e->name, dev->bus->procdir);
 423                 dev->procent = NULL;
 424         }
 425         return 0;
 426 }
 427
 428 #if 0
 429 int pci_proc_attach_bus(struct pci_bus* bus)
 430 {
 431         struct proc_dir_entry *de = bus->procdir;
 432
 433         if (!proc_initialized)
 434                 return -EACCES;
 435
 436         if (!de) {
 437                 char name[16];
 438                 sprintf(name, "%02x", bus->number);
 439                 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 440                 if (!de)
 441                         return -ENOMEM;
 442         }
 443         return 0;
 444 }
 445 #endif  /*  0  */
 446
 447 int pci_proc_detach_bus(struct pci_bus* bus)
 448 {
 449         struct proc_dir_entry *de = bus->procdir;
 450         if (de)
 451                 remove_proc_entry(de->name, proc_bus_pci_dir);
 452         return 0;
 453 }
 454
 455 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 456 {
 457         return seq_open(file, &proc_bus_pci_devices_op);
 458 }
 459 static const struct file_operations proc_bus_pci_dev_operations = {
 460         .open           = proc_bus_pci_dev_open,
 461         .read           = seq_read,
 462         .llseek         = seq_lseek,
 463         .release        = seq_release,
 464 };
 465
 466 static int __init pci_proc_init(void)
 467 {
 468         struct proc_dir_entry *entry;
 469         struct pci_dev *dev = NULL;
 470         proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
 471         entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
 472         if (entry)
 473                 entry->proc_fops = &proc_bus_pci_dev_operations;
 474         proc_initialized = 1;
 475         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 476                 pci_proc_attach_device(dev);
 477         }
 478         return 0;
 479 }
 480
 481 __initcall(pci_proc_init);
 482
 483 #ifdef CONFIG_HOTPLUG
 484 EXPORT_SYMBOL(pci_proc_detach_bus);
 485 #endif
 486