| 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 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; |
| 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 | ret = pci_mmap_page_range(dev, vma, |
| 249 | fpriv->mmap_state, |
| 250 | fpriv->write_combine); |
| 251 | if (ret < 0) |
| 252 | return ret; |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static int proc_bus_pci_open(struct inode *inode, struct file *file) |
| 258 | { |
| 259 | struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); |
| 260 | |
| 261 | if (!fpriv) |
| 262 | return -ENOMEM; |
| 263 | |
| 264 | fpriv->mmap_state = pci_mmap_io; |
| 265 | fpriv->write_combine = 0; |
| 266 | |
| 267 | file->private_data = fpriv; |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int proc_bus_pci_release(struct inode *inode, struct file *file) |
| 273 | { |
| 274 | kfree(file->private_data); |
| 275 | file->private_data = NULL; |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | #endif /* HAVE_PCI_MMAP */ |
| 280 | |
| 281 | static const struct file_operations proc_bus_pci_operations = { |
| 282 | .owner = THIS_MODULE, |
| 283 | .llseek = proc_bus_pci_lseek, |
| 284 | .read = proc_bus_pci_read, |
| 285 | .write = proc_bus_pci_write, |
| 286 | .unlocked_ioctl = proc_bus_pci_ioctl, |
| 287 | .compat_ioctl = proc_bus_pci_ioctl, |
| 288 | #ifdef HAVE_PCI_MMAP |
| 289 | .open = proc_bus_pci_open, |
| 290 | .release = proc_bus_pci_release, |
| 291 | .mmap = proc_bus_pci_mmap, |
| 292 | #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA |
| 293 | .get_unmapped_area = get_pci_unmapped_area, |
| 294 | #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ |
| 295 | #endif /* HAVE_PCI_MMAP */ |
| 296 | }; |
| 297 | |
| 298 | /* iterator */ |
| 299 | static void *pci_seq_start(struct seq_file *m, loff_t *pos) |
| 300 | { |
| 301 | struct pci_dev *dev = NULL; |
| 302 | loff_t n = *pos; |
| 303 | |
| 304 | for_each_pci_dev(dev) { |
| 305 | if (!n--) |
| 306 | break; |
| 307 | } |
| 308 | return dev; |
| 309 | } |
| 310 | |
| 311 | static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 312 | { |
| 313 | struct pci_dev *dev = v; |
| 314 | |
| 315 | (*pos)++; |
| 316 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); |
| 317 | return dev; |
| 318 | } |
| 319 | |
| 320 | static void pci_seq_stop(struct seq_file *m, void *v) |
| 321 | { |
| 322 | if (v) { |
| 323 | struct pci_dev *dev = v; |
| 324 | pci_dev_put(dev); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | static int show_device(struct seq_file *m, void *v) |
| 329 | { |
| 330 | const struct pci_dev *dev = v; |
| 331 | const struct pci_driver *drv; |
| 332 | int i; |
| 333 | |
| 334 | if (dev == NULL) |
| 335 | return 0; |
| 336 | |
| 337 | drv = pci_dev_driver(dev); |
| 338 | seq_printf(m, "%02x%02x\t%04x%04x\t%x", |
| 339 | dev->bus->number, |
| 340 | dev->devfn, |
| 341 | dev->vendor, |
| 342 | dev->device, |
| 343 | dev->irq); |
| 344 | |
| 345 | /* only print standard and ROM resources to preserve compatibility */ |
| 346 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 347 | resource_size_t start, end; |
| 348 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
| 349 | seq_printf(m, "\t%16llx", |
| 350 | (unsigned long long)(start | |
| 351 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); |
| 352 | } |
| 353 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 354 | resource_size_t start, end; |
| 355 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
| 356 | seq_printf(m, "\t%16llx", |
| 357 | dev->resource[i].start < dev->resource[i].end ? |
| 358 | (unsigned long long)(end - start) + 1 : 0); |
| 359 | } |
| 360 | seq_putc(m, '\t'); |
| 361 | if (drv) |
| 362 | seq_printf(m, "%s", drv->name); |
| 363 | seq_putc(m, '\n'); |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | static const struct seq_operations proc_bus_pci_devices_op = { |
| 368 | .start = pci_seq_start, |
| 369 | .next = pci_seq_next, |
| 370 | .stop = pci_seq_stop, |
| 371 | .show = show_device |
| 372 | }; |
| 373 | |
| 374 | static struct proc_dir_entry *proc_bus_pci_dir; |
| 375 | |
| 376 | int pci_proc_attach_device(struct pci_dev *dev) |
| 377 | { |
| 378 | struct pci_bus *bus = dev->bus; |
| 379 | struct proc_dir_entry *e; |
| 380 | char name[16]; |
| 381 | |
| 382 | if (!proc_initialized) |
| 383 | return -EACCES; |
| 384 | |
| 385 | if (!bus->procdir) { |
| 386 | if (pci_proc_domain(bus)) { |
| 387 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), |
| 388 | bus->number); |
| 389 | } else { |
| 390 | sprintf(name, "%02x", bus->number); |
| 391 | } |
| 392 | bus->procdir = proc_mkdir(name, proc_bus_pci_dir); |
| 393 | if (!bus->procdir) |
| 394 | return -ENOMEM; |
| 395 | } |
| 396 | |
| 397 | sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| 398 | e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, |
| 399 | &proc_bus_pci_operations, dev); |
| 400 | if (!e) |
| 401 | return -ENOMEM; |
| 402 | proc_set_size(e, dev->cfg_size); |
| 403 | dev->procent = e; |
| 404 | |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | int pci_proc_detach_device(struct pci_dev *dev) |
| 409 | { |
| 410 | proc_remove(dev->procent); |
| 411 | dev->procent = NULL; |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | int pci_proc_detach_bus(struct pci_bus *bus) |
| 416 | { |
| 417 | proc_remove(bus->procdir); |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) |
| 422 | { |
| 423 | return seq_open(file, &proc_bus_pci_devices_op); |
| 424 | } |
| 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 | device_initcall(pci_proc_init); |