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_inode(file);
  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        struct pci_dev *dev = PDE_DATA(file_inode(file));
  50        unsigned int pos = *ppos;
  51        unsigned int cnt, size;
  52
  53        /*
  54         * Normal users can read only the standardized portion of the
  55         * configuration space as several chips lock up when trying to read
  56         * undefined locations (think of Intel PIIX4 as a typical example).
  57         */
  58
  59        if (capable(CAP_SYS_ADMIN))
  60                size = dev->cfg_size;
  61        else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  62                size = 128;
  63        else
  64                size = 64;
  65
  66        if (pos >= size)
  67                return 0;
  68        if (nbytes >= size)
  69                nbytes = size;
  70        if (pos + nbytes > size)
  71                nbytes = size - pos;
  72        cnt = nbytes;
  73
  74        if (!access_ok(VERIFY_WRITE, buf, cnt))
  75                return -EINVAL;
  76
  77        pci_config_pm_runtime_get(dev);
  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        pci_config_pm_runtime_put(dev);
 125
 126        *ppos = pos;
 127        return nbytes;
 128}
 129
 130static ssize_t
 131proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 132{
 133        struct inode *ino = file_inode(file);
 134        struct pci_dev *dev = PDE_DATA(ino);
 135        int pos = *ppos;
 136        int size = dev->cfg_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        pci_config_pm_runtime_get(dev);
 151
 152        if ((pos & 1) && cnt) {
 153                unsigned char val;
 154                __get_user(val, buf);
 155                pci_user_write_config_byte(dev, pos, val);
 156                buf++;
 157                pos++;
 158                cnt--;
 159        }
 160
 161        if ((pos & 3) && cnt > 2) {
 162                __le16 val;
 163                __get_user(val, (__le16 __user *) buf);
 164                pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 165                buf += 2;
 166                pos += 2;
 167                cnt -= 2;
 168        }
 169
 170        while (cnt >= 4) {
 171                __le32 val;
 172                __get_user(val, (__le32 __user *) buf);
 173                pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 174                buf += 4;
 175                pos += 4;
 176                cnt -= 4;
 177        }
 178
 179        if (cnt >= 2) {
 180                __le16 val;
 181                __get_user(val, (__le16 __user *) buf);
 182                pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 183                buf += 2;
 184                pos += 2;
 185                cnt -= 2;
 186        }
 187
 188        if (cnt) {
 189                unsigned char val;
 190                __get_user(val, buf);
 191                pci_user_write_config_byte(dev, pos, val);
 192                buf++;
 193                pos++;
 194                cnt--;
 195        }
 196
 197        pci_config_pm_runtime_put(dev);
 198
 199        *ppos = pos;
 200        i_size_write(ino, dev->cfg_size);
 201        return nbytes;
 202}
 203
 204struct pci_filp_private {
 205        enum pci_mmap_state mmap_state;
 206        int write_combine;
 207};
 208
 209static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 210                               unsigned long arg)
 211{
 212        struct pci_dev *dev = PDE_DATA(file_inode(file));
 213#ifdef HAVE_PCI_MMAP
 214        struct pci_filp_private *fpriv = file->private_data;
 215#endif /* HAVE_PCI_MMAP */
 216        int ret = 0;
 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        return ret;
 247}
 248
 249#ifdef HAVE_PCI_MMAP
 250static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 251{
 252        struct pci_dev *dev = PDE_DATA(file_inode(file));
 253        struct pci_filp_private *fpriv = file->private_data;
 254        int i, ret;
 255
 256        if (!capable(CAP_SYS_RAWIO))
 257                return -EPERM;
 258
 259        /* Make sure the caller is mapping a real resource for this device */
 260        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 261                if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 262                        break;
 263        }
 264
 265        if (i >= PCI_ROM_RESOURCE)
 266                return -ENODEV;
 267
 268        ret = pci_mmap_page_range(dev, vma,
 269                                  fpriv->mmap_state,
 270                                  fpriv->write_combine);
 271        if (ret < 0)
 272                return ret;
 273
 274        return 0;
 275}
 276
 277static int proc_bus_pci_open(struct inode *inode, struct file *file)
 278{
 279        struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 280
 281        if (!fpriv)
 282                return -ENOMEM;
 283
 284        fpriv->mmap_state = pci_mmap_io;
 285        fpriv->write_combine = 0;
 286
 287        file->private_data = fpriv;
 288
 289        return 0;
 290}
 291
 292static int proc_bus_pci_release(struct inode *inode, struct file *file)
 293{
 294        kfree(file->private_data);
 295        file->private_data = NULL;
 296
 297        return 0;
 298}
 299#endif /* HAVE_PCI_MMAP */
 300
 301static const struct file_operations proc_bus_pci_operations = {
 302        .owner          = THIS_MODULE,
 303        .llseek         = proc_bus_pci_lseek,
 304        .read           = proc_bus_pci_read,
 305        .write          = proc_bus_pci_write,
 306        .unlocked_ioctl = proc_bus_pci_ioctl,
 307        .compat_ioctl   = proc_bus_pci_ioctl,
 308#ifdef HAVE_PCI_MMAP
 309        .open           = proc_bus_pci_open,
 310        .release        = proc_bus_pci_release,
 311        .mmap           = proc_bus_pci_mmap,
 312#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 313        .get_unmapped_area = get_pci_unmapped_area,
 314#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 315#endif /* HAVE_PCI_MMAP */
 316};
 317
 318/* iterator */
 319static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 320{
 321        struct pci_dev *dev = NULL;
 322        loff_t n = *pos;
 323
 324        for_each_pci_dev(dev) {
 325                if (!n--)
 326                        break;
 327        }
 328        return dev;
 329}
 330
 331static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 332{
 333        struct pci_dev *dev = v;
 334
 335        (*pos)++;
 336        dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 337        return dev;
 338}
 339
 340static void pci_seq_stop(struct seq_file *m, void *v)
 341{
 342        if (v) {
 343                struct pci_dev *dev = v;
 344                pci_dev_put(dev);
 345        }
 346}
 347
 348static int show_device(struct seq_file *m, void *v)
 349{
 350        const struct pci_dev *dev = v;
 351        const struct pci_driver *drv;
 352        int i;
 353
 354        if (dev == NULL)
 355                return 0;
 356
 357        drv = pci_dev_driver(dev);
 358        seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 359                        dev->bus->number,
 360                        dev->devfn,
 361                        dev->vendor,
 362                        dev->device,
 363                        dev->irq);
 364
 365        /* only print standard and ROM resources to preserve compatibility */
 366        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 367                resource_size_t start, end;
 368                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 369                seq_printf(m, "\t%16llx",
 370                        (unsigned long long)(start |
 371                        (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 372        }
 373        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 374                resource_size_t start, end;
 375                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 376                seq_printf(m, "\t%16llx",
 377                        dev->resource[i].start < dev->resource[i].end ?
 378                        (unsigned long long)(end - start) + 1 : 0);
 379        }
 380        seq_putc(m, '\t');
 381        if (drv)
 382                seq_printf(m, "%s", drv->name);
 383        seq_putc(m, '\n');
 384        return 0;
 385}
 386
 387static const struct seq_operations proc_bus_pci_devices_op = {
 388        .start  = pci_seq_start,
 389        .next   = pci_seq_next,
 390        .stop   = pci_seq_stop,
 391        .show   = show_device
 392};
 393
 394static struct proc_dir_entry *proc_bus_pci_dir;
 395
 396int pci_proc_attach_device(struct pci_dev *dev)
 397{
 398        struct pci_bus *bus = dev->bus;
 399        struct proc_dir_entry *e;
 400        char name[16];
 401
 402        if (!proc_initialized)
 403                return -EACCES;
 404
 405        if (!bus->procdir) {
 406                if (pci_proc_domain(bus)) {
 407                        sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 408                                        bus->number);
 409                } else {
 410                        sprintf(name, "%02x", bus->number);
 411                }
 412                bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 413                if (!bus->procdir)
 414                        return -ENOMEM;
 415        }
 416
 417        sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 418        e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 419                             &proc_bus_pci_operations, dev);
 420        if (!e)
 421                return -ENOMEM;
 422        proc_set_size(e, dev->cfg_size);
 423        dev->procent = e;
 424
 425        return 0;
 426}
 427
 428int pci_proc_detach_device(struct pci_dev *dev)
 429{
 430        proc_remove(dev->procent);
 431        dev->procent = NULL;
 432        return 0;
 433}
 434
 435int pci_proc_detach_bus(struct pci_bus* bus)
 436{
 437        proc_remove(bus->procdir);
 438        return 0;
 439}
 440
 441static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 442{
 443        return seq_open(file, &proc_bus_pci_devices_op);
 444}
 445static const struct file_operations proc_bus_pci_dev_operations = {
 446        .owner          = THIS_MODULE,
 447        .open           = proc_bus_pci_dev_open,
 448        .read           = seq_read,
 449        .llseek         = seq_lseek,
 450        .release        = seq_release,
 451};
 452
 453static int __init pci_proc_init(void)
 454{
 455        struct pci_dev *dev = NULL;
 456        proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 457        proc_create("devices", 0, proc_bus_pci_dir,
 458                    &proc_bus_pci_dev_operations);
 459        proc_initialized = 1;
 460        for_each_pci_dev(dev)
 461                pci_proc_attach_device(dev);
 462
 463        return 0;
 464}
 465
 466device_initcall(pci_proc_init);
 467
 468
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