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;
 235
 236         if (!capable(CAP_SYS_RAWIO))
 237                 return -EPERM;
 238
 239         /* Make sure the caller is mapping a real resource for this device */
 240         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 241                 if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 242                         break;
 243         }
 244
 245         if (i >= PCI_ROM_RESOURCE)
 246                 return -ENODEV;
 247
 248         if (fpriv->mmap_state == pci_mmap_mem)
 249                 write_combine = fpriv->write_combine;
 250         else
 251                 write_combine = 0;
 252         ret = pci_mmap_page_range(dev, vma,
 253                                   fpriv->mmap_state, write_combine);
 254         if (ret < 0)
 255                 return ret;
 256
 257         return 0;
 258 }
 259
 260 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 261 {
 262         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 263
 264         if (!fpriv)
 265                 return -ENOMEM;
 266
 267         fpriv->mmap_state = pci_mmap_io;
 268         fpriv->write_combine = 0;
 269
 270         file->private_data = fpriv;
 271
 272         return 0;
 273 }
 274
 275 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 276 {
 277         kfree(file->private_data);
 278         file->private_data = NULL;
 279
 280         return 0;
 281 }
 282 #endif /* HAVE_PCI_MMAP */
 283
 284 static const struct file_operations proc_bus_pci_operations = {
 285         .owner          = THIS_MODULE,
 286         .llseek         = proc_bus_pci_lseek,
 287         .read           = proc_bus_pci_read,
 288         .write          = proc_bus_pci_write,
 289         .unlocked_ioctl = proc_bus_pci_ioctl,
 290         .compat_ioctl   = proc_bus_pci_ioctl,
 291 #ifdef HAVE_PCI_MMAP
 292         .open           = proc_bus_pci_open,
 293         .release        = proc_bus_pci_release,
 294         .mmap           = proc_bus_pci_mmap,
 295 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 296         .get_unmapped_area = get_pci_unmapped_area,
 297 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 298 #endif /* HAVE_PCI_MMAP */
 299 };
 300
 301 /* iterator */
 302 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 303 {
 304         struct pci_dev *dev = NULL;
 305         loff_t n = *pos;
 306
 307         for_each_pci_dev(dev) {
 308                 if (!n--)
 309                         break;
 310         }
 311         return dev;
 312 }
 313
 314 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 315 {
 316         struct pci_dev *dev = v;
 317
 318         (*pos)++;
 319         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 320         return dev;
 321 }
 322
 323 static void pci_seq_stop(struct seq_file *m, void *v)
 324 {
 325         if (v) {
 326                 struct pci_dev *dev = v;
 327                 pci_dev_put(dev);
 328         }
 329 }
 330
 331 static int show_device(struct seq_file *m, void *v)
 332 {
 333         const struct pci_dev *dev = v;
 334         const struct pci_driver *drv;
 335         int i;
 336
 337         if (dev == NULL)
 338                 return 0;
 339
 340         drv = pci_dev_driver(dev);
 341         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 342                         dev->bus->number,
 343                         dev->devfn,
 344                         dev->vendor,
 345                         dev->device,
 346                         dev->irq);
 347
 348         /* only print standard and ROM resources to preserve compatibility */
 349         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 350                 resource_size_t start, end;
 351                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 352                 seq_printf(m, "\t%16llx",
 353                         (unsigned long long)(start |
 354                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 355         }
 356         for (i = 0; i <= PCI_ROM_RESOURCE; 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                         dev->resource[i].start < dev->resource[i].end ?
 361                         (unsigned long long)(end - start) + 1 : 0);
 362         }
 363         seq_putc(m, '\t');
 364         if (drv)
 365                 seq_printf(m, "%s", drv->name);
 366         seq_putc(m, '\n');
 367         return 0;
 368 }
 369
 370 static const struct seq_operations proc_bus_pci_devices_op = {
 371         .start  = pci_seq_start,
 372         .next   = pci_seq_next,
 373         .stop   = pci_seq_stop,
 374         .show   = show_device
 375 };
 376
 377 static struct proc_dir_entry *proc_bus_pci_dir;
 378
 379 int pci_proc_attach_device(struct pci_dev *dev)
 380 {
 381         struct pci_bus *bus = dev->bus;
 382         struct proc_dir_entry *e;
 383         char name[16];
 384
 385         if (!proc_initialized)
 386                 return -EACCES;
 387
 388         if (!bus->procdir) {
 389                 if (pci_proc_domain(bus)) {
 390                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 391                                         bus->number);
 392                 } else {
 393                         sprintf(name, "%02x", bus->number);
 394                 }
 395                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 396                 if (!bus->procdir)
 397                         return -ENOMEM;
 398         }
 399
 400         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 401         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 402                              &proc_bus_pci_operations, dev);
 403         if (!e)
 404                 return -ENOMEM;
 405         proc_set_size(e, dev->cfg_size);
 406         dev->procent = e;
 407
 408         return 0;
 409 }
 410
 411 int pci_proc_detach_device(struct pci_dev *dev)
 412 {
 413         proc_remove(dev->procent);
 414         dev->procent = NULL;
 415         return 0;
 416 }
 417
 418 int pci_proc_detach_bus(struct pci_bus *bus)
 419 {
 420         proc_remove(bus->procdir);
 421         return 0;
 422 }
 423
 424 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 425 {
 426         return seq_open(file, &proc_bus_pci_devices_op);
 427 }
 428
 429 static const struct file_operations proc_bus_pci_dev_operations = {
 430         .owner          = THIS_MODULE,
 431         .open           = proc_bus_pci_dev_open,
 432         .read           = seq_read,
 433         .llseek         = seq_lseek,
 434         .release        = seq_release,
 435 };
 436
 437 static int __init pci_proc_init(void)
 438 {
 439         struct pci_dev *dev = NULL;
 440         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 441         proc_create("devices", 0, proc_bus_pci_dir,
 442                     &proc_bus_pci_dev_operations);
 443         proc_initialized = 1;
 444         for_each_pci_dev(dev)
 445                 pci_proc_attach_device(dev);
 446
 447         return 0;
 448 }
 449 device_initcall(pci_proc_init);