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        const struct inode *ino = file_inode(file);
  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        pci_config_pm_runtime_get(dev);
  80
  81        if ((pos & 1) && cnt) {
  82                unsigned char val;
  83                pci_user_read_config_byte(dev, pos, &val);
  84                __put_user(val, buf);
  85                buf++;
  86                pos++;
  87                cnt--;
  88        }
  89
  90        if ((pos & 3) && cnt > 2) {
  91                unsigned short val;
  92                pci_user_read_config_word(dev, pos, &val);
  93                __put_user(cpu_to_le16(val), (__le16 __user *) buf);
  94                buf += 2;
  95                pos += 2;
  96                cnt -= 2;
  97        }
  98
  99        while (cnt >= 4) {
 100                unsigned int val;
 101                pci_user_read_config_dword(dev, pos, &val);
 102                __put_user(cpu_to_le32(val), (__le32 __user *) buf);
 103                buf += 4;
 104                pos += 4;
 105                cnt -= 4;
 106        }
 107
 108        if (cnt >= 2) {
 109                unsigned short val;
 110                pci_user_read_config_word(dev, pos, &val);
 111                __put_user(cpu_to_le16(val), (__le16 __user *) buf);
 112                buf += 2;
 113                pos += 2;
 114                cnt -= 2;
 115        }
 116
 117        if (cnt) {
 118                unsigned char val;
 119                pci_user_read_config_byte(dev, pos, &val);
 120                __put_user(val, buf);
 121                buf++;
 122                pos++;
 123                cnt--;
 124        }
 125
 126        pci_config_pm_runtime_put(dev);
 127
 128        *ppos = pos;
 129        return nbytes;
 130}
 131
 132static ssize_t
 133proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 134{
 135        struct inode *ino = file_inode(file);
 136        const struct proc_dir_entry *dp = PDE(ino);
 137        struct pci_dev *dev = dp->data;
 138        int pos = *ppos;
 139        int size = dp->size;
 140        int cnt;
 141
 142        if (pos >= size)
 143                return 0;
 144        if (nbytes >= size)
 145                nbytes = size;
 146        if (pos + nbytes > size)
 147                nbytes = size - pos;
 148        cnt = nbytes;
 149
 150        if (!access_ok(VERIFY_READ, buf, cnt))
 151                return -EINVAL;
 152
 153        pci_config_pm_runtime_get(dev);
 154
 155        if ((pos & 1) && cnt) {
 156                unsigned char val;
 157                __get_user(val, buf);
 158                pci_user_write_config_byte(dev, pos, val);
 159                buf++;
 160                pos++;
 161                cnt--;
 162        }
 163
 164        if ((pos & 3) && cnt > 2) {
 165                __le16 val;
 166                __get_user(val, (__le16 __user *) buf);
 167                pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 168                buf += 2;
 169                pos += 2;
 170                cnt -= 2;
 171        }
 172
 173        while (cnt >= 4) {
 174                __le32 val;
 175                __get_user(val, (__le32 __user *) buf);
 176                pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 177                buf += 4;
 178                pos += 4;
 179                cnt -= 4;
 180        }
 181
 182        if (cnt >= 2) {
 183                __le16 val;
 184                __get_user(val, (__le16 __user *) buf);
 185                pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 186                buf += 2;
 187                pos += 2;
 188                cnt -= 2;
 189        }
 190
 191        if (cnt) {
 192                unsigned char val;
 193                __get_user(val, buf);
 194                pci_user_write_config_byte(dev, pos, val);
 195                buf++;
 196                pos++;
 197                cnt--;
 198        }
 199
 200        pci_config_pm_runtime_put(dev);
 201
 202        *ppos = pos;
 203        i_size_write(ino, dp->size);
 204        return nbytes;
 205}
 206
 207struct pci_filp_private {
 208        enum pci_mmap_state mmap_state;
 209        int write_combine;
 210};
 211
 212static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 213                               unsigned long arg)
 214{
 215        const struct proc_dir_entry *dp = PDE(file_inode(file));
 216        struct pci_dev *dev = dp->data;
 217#ifdef HAVE_PCI_MMAP
 218        struct pci_filp_private *fpriv = file->private_data;
 219#endif /* HAVE_PCI_MMAP */
 220        int ret = 0;
 221
 222        switch (cmd) {
 223        case PCIIOC_CONTROLLER:
 224                ret = pci_domain_nr(dev->bus);
 225                break;
 226
 227#ifdef HAVE_PCI_MMAP
 228        case PCIIOC_MMAP_IS_IO:
 229                fpriv->mmap_state = pci_mmap_io;
 230                break;
 231
 232        case PCIIOC_MMAP_IS_MEM:
 233                fpriv->mmap_state = pci_mmap_mem;
 234                break;
 235
 236        case PCIIOC_WRITE_COMBINE:
 237                if (arg)
 238                        fpriv->write_combine = 1;
 239                else
 240                        fpriv->write_combine = 0;
 241                break;
 242
 243#endif /* HAVE_PCI_MMAP */
 244
 245        default:
 246                ret = -EINVAL;
 247                break;
 248        };
 249
 250        return ret;
 251}
 252
 253#ifdef HAVE_PCI_MMAP
 254static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 255{
 256        struct inode *inode = file_inode(file);
 257        const struct proc_dir_entry *dp = PDE(inode);
 258        struct pci_dev *dev = dp->data;
 259        struct pci_filp_private *fpriv = file->private_data;
 260        int i, ret;
 261
 262        if (!capable(CAP_SYS_RAWIO))
 263                return -EPERM;
 264
 265        /* Make sure the caller is mapping a real resource for this device */
 266        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 267                if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 268                        break;
 269        }
 270
 271        if (i >= PCI_ROM_RESOURCE)
 272                return -ENODEV;
 273
 274        ret = pci_mmap_page_range(dev, vma,
 275                                  fpriv->mmap_state,
 276                                  fpriv->write_combine);
 277        if (ret < 0)
 278                return ret;
 279
 280        return 0;
 281}
 282
 283static int proc_bus_pci_open(struct inode *inode, struct file *file)
 284{
 285        struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
 286
 287        if (!fpriv)
 288                return -ENOMEM;
 289
 290        fpriv->mmap_state = pci_mmap_io;
 291        fpriv->write_combine = 0;
 292
 293        file->private_data = fpriv;
 294
 295        return 0;
 296}
 297
 298static int proc_bus_pci_release(struct inode *inode, struct file *file)
 299{
 300        kfree(file->private_data);
 301        file->private_data = NULL;
 302
 303        return 0;
 304}
 305#endif /* HAVE_PCI_MMAP */
 306
 307static const struct file_operations proc_bus_pci_operations = {
 308        .owner          = THIS_MODULE,
 309        .llseek         = proc_bus_pci_lseek,
 310        .read           = proc_bus_pci_read,
 311        .write          = proc_bus_pci_write,
 312        .unlocked_ioctl = proc_bus_pci_ioctl,
 313        .compat_ioctl   = proc_bus_pci_ioctl,
 314#ifdef HAVE_PCI_MMAP
 315        .open           = proc_bus_pci_open,
 316        .release        = proc_bus_pci_release,
 317        .mmap           = proc_bus_pci_mmap,
 318#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 319        .get_unmapped_area = get_pci_unmapped_area,
 320#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 321#endif /* HAVE_PCI_MMAP */
 322};
 323
 324/* iterator */
 325static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 326{
 327        struct pci_dev *dev = NULL;
 328        loff_t n = *pos;
 329
 330        for_each_pci_dev(dev) {
 331                if (!n--)
 332                        break;
 333        }
 334        return dev;
 335}
 336
 337static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 338{
 339        struct pci_dev *dev = v;
 340
 341        (*pos)++;
 342        dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 343        return dev;
 344}
 345
 346static void pci_seq_stop(struct seq_file *m, void *v)
 347{
 348        if (v) {
 349                struct pci_dev *dev = v;
 350                pci_dev_put(dev);
 351        }
 352}
 353
 354static int show_device(struct seq_file *m, void *v)
 355{
 356        const struct pci_dev *dev = v;
 357        const struct pci_driver *drv;
 358        int i;
 359
 360        if (dev == NULL)
 361                return 0;
 362
 363        drv = pci_dev_driver(dev);
 364        seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 365                        dev->bus->number,
 366                        dev->devfn,
 367                        dev->vendor,
 368                        dev->device,
 369                        dev->irq);
 370
 371        /* only print standard and ROM resources to preserve compatibility */
 372        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 373                resource_size_t start, end;
 374                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 375                seq_printf(m, "\t%16llx",
 376                        (unsigned long long)(start |
 377                        (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 378        }
 379        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 380                resource_size_t start, end;
 381                pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 382                seq_printf(m, "\t%16llx",
 383                        dev->resource[i].start < dev->resource[i].end ?
 384                        (unsigned long long)(end - start) + 1 : 0);
 385        }
 386        seq_putc(m, '\t');
 387        if (drv)
 388                seq_printf(m, "%s", drv->name);
 389        seq_putc(m, '\n');
 390        return 0;
 391}
 392
 393static const struct seq_operations proc_bus_pci_devices_op = {
 394        .start  = pci_seq_start,
 395        .next   = pci_seq_next,
 396        .stop   = pci_seq_stop,
 397        .show   = show_device
 398};
 399
 400static struct proc_dir_entry *proc_bus_pci_dir;
 401
 402int pci_proc_attach_device(struct pci_dev *dev)
 403{
 404        struct pci_bus *bus = dev->bus;
 405        struct proc_dir_entry *e;
 406        char name[16];
 407
 408        if (!proc_initialized)
 409                return -EACCES;
 410
 411        if (!bus->procdir) {
 412                if (pci_proc_domain(bus)) {
 413                        sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 414                                        bus->number);
 415                } else {
 416                        sprintf(name, "%02x", bus->number);
 417                }
 418                bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 419                if (!bus->procdir)
 420                        return -ENOMEM;
 421        }
 422
 423        sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 424        e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
 425                             &proc_bus_pci_operations, dev);
 426        if (!e)
 427                return -ENOMEM;
 428        e->size = dev->cfg_size;
 429        dev->procent = e;
 430
 431        return 0;
 432}
 433
 434int pci_proc_detach_device(struct pci_dev *dev)
 435{
 436        struct proc_dir_entry *e;
 437
 438        if ((e = dev->procent)) {
 439                remove_proc_entry(e->name, dev->bus->procdir);
 440                dev->procent = NULL;
 441        }
 442        return 0;
 443}
 444
 445int pci_proc_detach_bus(struct pci_bus* bus)
 446{
 447        struct proc_dir_entry *de = bus->procdir;
 448        if (de)
 449                remove_proc_entry(de->name, proc_bus_pci_dir);
 450        return 0;
 451}
 452
 453static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 454{
 455        return seq_open(file, &proc_bus_pci_devices_op);
 456}
 457static const struct file_operations proc_bus_pci_dev_operations = {
 458        .owner          = THIS_MODULE,
 459        .open           = proc_bus_pci_dev_open,
 460        .read           = seq_read,
 461        .llseek         = seq_lseek,
 462        .release        = seq_release,
 463};
 464
 465static int __init pci_proc_init(void)
 466{
 467        struct pci_dev *dev = NULL;
 468        proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
 469        proc_create("devices", 0, proc_bus_pci_dir,
 470                    &proc_bus_pci_dev_operations);
 471        proc_initialized = 1;
 472        for_each_pci_dev(dev)
 473                pci_proc_attach_device(dev);
 474
 475        return 0;
 476}
 477
 478device_initcall(pci_proc_init);
 479
 480
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