linux/drivers/pci/proc.c
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   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
  18static int proc_initialized;    /* = 0 */
  19
  20static loff_t
  21proc_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
  46static ssize_t
  47proc_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
 128static ssize_t
 129proc_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
 199struct pci_filp_private {
 200        enum pci_mmap_state mmap_state;
 201        int write_combine;
 202};
 203
 204static 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        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
 246static 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 i, ret;
 253
 254        if (!capable(CAP_SYS_RAWIO))
 255                return -EPERM;
 256
 257        /* Make sure the caller is mapping a real resource for this device */
 258        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 259                if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 260                        break;
 261        }
 262
 263        if (i >= PCI_ROM_RESOURCE)
 264                return -ENODEV;
 265
 266        ret = pci_mmap_page_range(dev, vma,
 267                                  fpriv->mmap_state,
 268                                  fpriv->write_combine);
 269        if (ret < 0)
 270                return ret;
 271
 272        return 0;
 273}
 274
 275static int proc_bus_pci_open(struct inode *inode, struct file *file)
 276{
 277        struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 278
 279        if (!fpriv)
 280                return -ENOMEM;
 281
 282        fpriv->mmap_state = pci_mmap_io;
 283        fpriv->write_combine = 0;
 284
 285        file->private_data = fpriv;
 286
 287        return 0;
 288}
 289
 290static int proc_bus_pci_release(struct inode *inode, struct file *file)
 291{
 292        kfree(file->private_data);
 293        file->private_data = NULL;
 294
 295        return 0;
 296}
 297#endif /* HAVE_PCI_MMAP */
 298
 299static const struct file_operations proc_bus_pci_operations = {
 300        .owner          = THIS_MODULE,
 301        .llseek         = proc_bus_pci_lseek,
 302        .read           = proc_bus_pci_read,
 303        .write          = proc_bus_pci_write,
 304        .unlocked_ioctl = proc_bus_pci_ioctl,
 305        .compat_ioctl   = proc_bus_pci_ioctl,
 306#ifdef HAVE_PCI_MMAP
 307        .open           = proc_bus_pci_open,
 308        .release        = proc_bus_pci_release,
 309        .mmap           = proc_bus_pci_mmap,
 310#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 311        .get_unmapped_area = get_pci_unmapped_area,
 312#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 313#endif /* HAVE_PCI_MMAP */
 314};
 315
 316/* iterator */
 317static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 318{
 319        struct pci_dev *dev = NULL;
 320        loff_t n = *pos;
 321
 322        for_each_pci_dev(dev) {
 323                if (!n--)
 324                        break;
 325        }
 326        return dev;
 327}
 328
 329static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 330{
 331        struct pci_dev *dev = v;
 332
 333        (*pos)++;
 334        dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 335        return dev;
 336}
 337
 338static void pci_seq_stop(struct seq_file *m, void *v)
 339{
 340        if (v) {
 341                struct pci_dev *dev = v;
 342                pci_dev_put(dev);
 343        }
 344}
 345
 346static int show_device(struct seq_file *m, void *v)
 347{
 348        const struct pci_dev *dev = v;
 349        const struct pci_driver *drv;
 350        int i;
 351
 352        if (dev == NULL)
 353                return 0;
 354
 355        drv = pci_dev_driver(dev);
 356        seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 357                        dev->bus->number,
 358                        dev->devfn,
 359                        dev->vendor,
 360                        dev->device,
 361                        dev->irq);
 362
 363        /* only print standard and ROM resources to preserve compatibility */
 364        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 365                resource_size_t start, end;
 366                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 367                seq_printf(m, "\t%16llx",
 368                        (unsigned long long)(start |
 369                        (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 370        }
 371        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 372                resource_size_t start, end;
 373                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 374                seq_printf(m, "\t%16llx",
 375                        dev->resource[i].start < dev->resource[i].end ?
 376                        (unsigned long long)(end - start) + 1 : 0);
 377        }
 378        seq_putc(m, '\t');
 379        if (drv)
 380                seq_printf(m, "%s", drv->name);
 381        seq_putc(m, '\n');
 382        return 0;
 383}
 384
 385static const struct seq_operations proc_bus_pci_devices_op = {
 386        .start  = pci_seq_start,
 387        .next   = pci_seq_next,
 388        .stop   = pci_seq_stop,
 389        .show   = show_device
 390};
 391
 392static struct proc_dir_entry *proc_bus_pci_dir;
 393
 394int pci_proc_attach_device(struct pci_dev *dev)
 395{
 396        struct pci_bus *bus = dev->bus;
 397        struct proc_dir_entry *e;
 398        char name[16];
 399
 400        if (!proc_initialized)
 401                return -EACCES;
 402
 403        if (!bus->procdir) {
 404                if (pci_proc_domain(bus)) {
 405                        sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 406                                        bus->number);
 407                } else {
 408                        sprintf(name, "%02x", bus->number);
 409                }
 410                bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 411                if (!bus->procdir)
 412                        return -ENOMEM;
 413        }
 414
 415        sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 416        e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 417                             &proc_bus_pci_operations, dev);
 418        if (!e)
 419                return -ENOMEM;
 420        e->size = dev->cfg_size;
 421        dev->procent = e;
 422
 423        return 0;
 424}
 425
 426int pci_proc_detach_device(struct pci_dev *dev)
 427{
 428        struct proc_dir_entry *e;
 429
 430        if ((e = dev->procent)) {
 431                remove_proc_entry(e->name, dev->bus->procdir);
 432                dev->procent = NULL;
 433        }
 434        return 0;
 435}
 436
 437#if 0
 438int pci_proc_attach_bus(struct pci_bus* bus)
 439{
 440        struct proc_dir_entry *de = bus->procdir;
 441
 442        if (!proc_initialized)
 443                return -EACCES;
 444
 445        if (!de) {
 446                char name[16];
 447                sprintf(name, "%02x", bus->number);
 448                de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 449                if (!de)
 450                        return -ENOMEM;
 451        }
 452        return 0;
 453}
 454#endif  /*  0  */
 455
 456int pci_proc_detach_bus(struct pci_bus* bus)
 457{
 458        struct proc_dir_entry *de = bus->procdir;
 459        if (de)
 460                remove_proc_entry(de->name, proc_bus_pci_dir);
 461        return 0;
 462}
 463
 464static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 465{
 466        return seq_open(file, &proc_bus_pci_devices_op);
 467}
 468static const struct file_operations proc_bus_pci_dev_operations = {
 469        .owner          = THIS_MODULE,
 470        .open           = proc_bus_pci_dev_open,
 471        .read           = seq_read,
 472        .llseek         = seq_lseek,
 473        .release        = seq_release,
 474};
 475
 476static int __init pci_proc_init(void)
 477{
 478        struct pci_dev *dev = NULL;
 479        proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 480        proc_create("devices", 0, proc_bus_pci_dir,
 481                    &proc_bus_pci_dev_operations);
 482        proc_initialized = 1;
 483        for_each_pci_dev(dev)
 484                pci_proc_attach_device(dev);
 485
 486        return 0;
 487}
 488
 489device_initcall(pci_proc_init);
 490
 491
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