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 <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         struct pci_dev *dev = PDE_DATA(file_inode(file));
  24         return fixed_size_llseek(file, off, whence, dev->cfg_size);
  25 }
  26
  27 static ssize_t
  28 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  29 {
  30         struct pci_dev *dev = PDE_DATA(file_inode(file));
  31         unsigned int pos = *ppos;
  32         unsigned int cnt, size;
  33
  34         /*
  35          * Normal users can read only the standardized portion of the
  36          * configuration space as several chips lock up when trying to read
  37          * undefined locations (think of Intel PIIX4 as a typical example).
  38          */
  39
  40         if (capable(CAP_SYS_ADMIN))
  41                 size = dev->cfg_size;
  42         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  43                 size = 128;
  44         else
  45                 size = 64;
  46
  47         if (pos >= size)
  48                 return 0;
  49         if (nbytes >= size)
  50                 nbytes = size;
  51         if (pos + nbytes > size)
  52                 nbytes = size - pos;
  53         cnt = nbytes;
  54
  55         if (!access_ok(VERIFY_WRITE, buf, cnt))
  56                 return -EINVAL;
  57
  58         pci_config_pm_runtime_get(dev);
  59
  60         if ((pos & 1) && cnt) {
  61                 unsigned char val;
  62                 pci_user_read_config_byte(dev, pos, &val);
  63                 __put_user(val, buf);
  64                 buf++;
  65                 pos++;
  66                 cnt--;
  67         }
  68
  69         if ((pos & 3) && cnt > 2) {
  70                 unsigned short val;
  71                 pci_user_read_config_word(dev, pos, &val);
  72                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  73                 buf += 2;
  74                 pos += 2;
  75                 cnt -= 2;
  76         }
  77
  78         while (cnt >= 4) {
  79                 unsigned int val;
  80                 pci_user_read_config_dword(dev, pos, &val);
  81                 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
  82                 buf += 4;
  83                 pos += 4;
  84                 cnt -= 4;
  85         }
  86
  87         if (cnt >= 2) {
  88                 unsigned short val;
  89                 pci_user_read_config_word(dev, pos, &val);
  90                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  91                 buf += 2;
  92                 pos += 2;
  93                 cnt -= 2;
  94         }
  95
  96         if (cnt) {
  97                 unsigned char val;
  98                 pci_user_read_config_byte(dev, pos, &val);
  99                 __put_user(val, buf);
 100                 buf++;
 101                 pos++;
 102                 cnt--;
 103         }
 104
 105         pci_config_pm_runtime_put(dev);
 106
 107         *ppos = pos;
 108         return nbytes;
 109 }
 110
 111 static ssize_t
 112 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 113 {
 114         struct inode *ino = file_inode(file);
 115         struct pci_dev *dev = PDE_DATA(ino);
 116         int pos = *ppos;
 117         int size = dev->cfg_size;
 118         int cnt;
 119
 120         if (pos >= size)
 121                 return 0;
 122         if (nbytes >= size)
 123                 nbytes = size;
 124         if (pos + nbytes > size)
 125                 nbytes = size - pos;
 126         cnt = nbytes;
 127
 128         if (!access_ok(VERIFY_READ, buf, cnt))
 129                 return -EINVAL;
 130
 131         pci_config_pm_runtime_get(dev);
 132
 133         if ((pos & 1) && cnt) {
 134                 unsigned char val;
 135                 __get_user(val, buf);
 136                 pci_user_write_config_byte(dev, pos, val);
 137                 buf++;
 138                 pos++;
 139                 cnt--;
 140         }
 141
 142         if ((pos & 3) && cnt > 2) {
 143                 __le16 val;
 144                 __get_user(val, (__le16 __user *) buf);
 145                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 146                 buf += 2;
 147                 pos += 2;
 148                 cnt -= 2;
 149         }
 150
 151         while (cnt >= 4) {
 152                 __le32 val;
 153                 __get_user(val, (__le32 __user *) buf);
 154                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 155                 buf += 4;
 156                 pos += 4;
 157                 cnt -= 4;
 158         }
 159
 160         if (cnt >= 2) {
 161                 __le16 val;
 162                 __get_user(val, (__le16 __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         if (cnt) {
 170                 unsigned char val;
 171                 __get_user(val, buf);
 172                 pci_user_write_config_byte(dev, pos, val);
 173                 buf++;
 174                 pos++;
 175                 cnt--;
 176         }
 177
 178         pci_config_pm_runtime_put(dev);
 179
 180         *ppos = pos;
 181         i_size_write(ino, dev->cfg_size);
 182         return nbytes;
 183 }
 184
 185 struct pci_filp_private {
 186         enum pci_mmap_state mmap_state;
 187         int write_combine;
 188 };
 189
 190 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 191                                unsigned long arg)
 192 {
 193         struct pci_dev *dev = PDE_DATA(file_inode(file));
 194 #ifdef HAVE_PCI_MMAP
 195         struct pci_filp_private *fpriv = file->private_data;
 196 #endif /* HAVE_PCI_MMAP */
 197         int ret = 0;
 198
 199         switch (cmd) {
 200         case PCIIOC_CONTROLLER:
 201                 ret = pci_domain_nr(dev->bus);
 202                 break;
 203
 204 #ifdef HAVE_PCI_MMAP
 205         case PCIIOC_MMAP_IS_IO:
 206                 fpriv->mmap_state = pci_mmap_io;
 207                 break;
 208
 209         case PCIIOC_MMAP_IS_MEM:
 210                 fpriv->mmap_state = pci_mmap_mem;
 211                 break;
 212
 213         case PCIIOC_WRITE_COMBINE:
 214                 if (arg)
 215                         fpriv->write_combine = 1;
 216                 else
 217                         fpriv->write_combine = 0;
 218                 break;
 219
 220 #endif /* HAVE_PCI_MMAP */
 221
 222         default:
 223                 ret = -EINVAL;
 224                 break;
 225         }
 226
 227         return ret;
 228 }
 229
 230 #ifdef HAVE_PCI_MMAP
 231 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 232 {
 233         struct pci_dev *dev = PDE_DATA(file_inode(file));
 234         struct pci_filp_private *fpriv = file->private_data;
 235         int i, ret;
 236
 237         if (!capable(CAP_SYS_RAWIO))
 238                 return -EPERM;
 239
 240         /* Make sure the caller is mapping a real resource for this device */
 241         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 242                 if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 243                         break;
 244         }
 245
 246         if (i >= PCI_ROM_RESOURCE)
 247                 return -ENODEV;
 248
 249         ret = pci_mmap_page_range(dev, vma,
 250                                   fpriv->mmap_state,
 251                                   fpriv->write_combine);
 252         if (ret < 0)
 253                 return ret;
 254
 255         return 0;
 256 }
 257
 258 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 259 {
 260         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 261
 262         if (!fpriv)
 263                 return -ENOMEM;
 264
 265         fpriv->mmap_state = pci_mmap_io;
 266         fpriv->write_combine = 0;
 267
 268         file->private_data = fpriv;
 269
 270         return 0;
 271 }
 272
 273 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 274 {
 275         kfree(file->private_data);
 276         file->private_data = NULL;
 277
 278         return 0;
 279 }
 280 #endif /* HAVE_PCI_MMAP */
 281
 282 static const struct file_operations proc_bus_pci_operations = {
 283         .owner          = THIS_MODULE,
 284         .llseek         = proc_bus_pci_lseek,
 285         .read           = proc_bus_pci_read,
 286         .write          = proc_bus_pci_write,
 287         .unlocked_ioctl = proc_bus_pci_ioctl,
 288         .compat_ioctl   = proc_bus_pci_ioctl,
 289 #ifdef HAVE_PCI_MMAP
 290         .open           = proc_bus_pci_open,
 291         .release        = proc_bus_pci_release,
 292         .mmap           = proc_bus_pci_mmap,
 293 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 294         .get_unmapped_area = get_pci_unmapped_area,
 295 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 296 #endif /* HAVE_PCI_MMAP */
 297 };
 298
 299 /* iterator */
 300 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 301 {
 302         struct pci_dev *dev = NULL;
 303         loff_t n = *pos;
 304
 305         for_each_pci_dev(dev) {
 306                 if (!n--)
 307                         break;
 308         }
 309         return dev;
 310 }
 311
 312 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 313 {
 314         struct pci_dev *dev = v;
 315
 316         (*pos)++;
 317         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 318         return dev;
 319 }
 320
 321 static void pci_seq_stop(struct seq_file *m, void *v)
 322 {
 323         if (v) {
 324                 struct pci_dev *dev = v;
 325                 pci_dev_put(dev);
 326         }
 327 }
 328
 329 static int show_device(struct seq_file *m, void *v)
 330 {
 331         const struct pci_dev *dev = v;
 332         const struct pci_driver *drv;
 333         int i;
 334
 335         if (dev == NULL)
 336                 return 0;
 337
 338         drv = pci_dev_driver(dev);
 339         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 340                         dev->bus->number,
 341                         dev->devfn,
 342                         dev->vendor,
 343                         dev->device,
 344                         dev->irq);
 345
 346         /* only print standard and ROM resources to preserve compatibility */
 347         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 348                 resource_size_t start, end;
 349                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 350                 seq_printf(m, "\t%16llx",
 351                         (unsigned long long)(start |
 352                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 353         }
 354         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 355                 resource_size_t start, end;
 356                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 357                 seq_printf(m, "\t%16llx",
 358                         dev->resource[i].start < dev->resource[i].end ?
 359                         (unsigned long long)(end - start) + 1 : 0);
 360         }
 361         seq_putc(m, '\t');
 362         if (drv)
 363                 seq_printf(m, "%s", drv->name);
 364         seq_putc(m, '\n');
 365         return 0;
 366 }
 367
 368 static const struct seq_operations proc_bus_pci_devices_op = {
 369         .start  = pci_seq_start,
 370         .next   = pci_seq_next,
 371         .stop   = pci_seq_stop,
 372         .show   = show_device
 373 };
 374
 375 static struct proc_dir_entry *proc_bus_pci_dir;
 376
 377 int pci_proc_attach_device(struct pci_dev *dev)
 378 {
 379         struct pci_bus *bus = dev->bus;
 380         struct proc_dir_entry *e;
 381         char name[16];
 382
 383         if (!proc_initialized)
 384                 return -EACCES;
 385
 386         if (!bus->procdir) {
 387                 if (pci_proc_domain(bus)) {
 388                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 389                                         bus->number);
 390                 } else {
 391                         sprintf(name, "%02x", bus->number);
 392                 }
 393                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 394                 if (!bus->procdir)
 395                         return -ENOMEM;
 396         }
 397
 398         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 399         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 400                              &proc_bus_pci_operations, dev);
 401         if (!e)
 402                 return -ENOMEM;
 403         proc_set_size(e, dev->cfg_size);
 404         dev->procent = e;
 405
 406         return 0;
 407 }
 408
 409 int pci_proc_detach_device(struct pci_dev *dev)
 410 {
 411         proc_remove(dev->procent);
 412         dev->procent = NULL;
 413         return 0;
 414 }
 415
 416 int pci_proc_detach_bus(struct pci_bus* bus)
 417 {
 418         proc_remove(bus->procdir);
 419         return 0;
 420 }
 421
 422 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 423 {
 424         return seq_open(file, &proc_bus_pci_devices_op);
 425 }
 426 static const struct file_operations proc_bus_pci_dev_operations = {
 427         .owner          = THIS_MODULE,
 428         .open           = proc_bus_pci_dev_open,
 429         .read           = seq_read,
 430         .llseek         = seq_lseek,
 431         .release        = seq_release,
 432 };
 433
 434 static int __init pci_proc_init(void)
 435 {
 436         struct pci_dev *dev = NULL;
 437         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 438         proc_create("devices", 0, proc_bus_pci_dir,
 439                     &proc_bus_pci_dev_operations);
 440         proc_initialized = 1;
 441         for_each_pci_dev(dev)
 442                 pci_proc_attach_device(dev);
 443
 444         return 0;
 445 }
 446
 447 device_initcall(pci_proc_init);
 448