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/module.h> 10 #include <linux/proc_fs.h> 11 #include <linux/seq_file.h> 12 #include <linux/smp_lock.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 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 46 static ssize_t 47 proc_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 } 127 128 static ssize_t 129 proc_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 } 198 199 struct pci_filp_private { 200 enum pci_mmap_state mmap_state; 201 int write_combine; 202 }; 203 204 static 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 lock_kernel(); 215 216 switch (cmd) { 217 case PCIIOC_CONTROLLER: 218 ret = pci_domain_nr(dev->bus); 219 break; 220 221 #ifdef HAVE_PCI_MMAP 222 case PCIIOC_MMAP_IS_IO: 223 fpriv->mmap_state = pci_mmap_io; 224 break; 225 226 case PCIIOC_MMAP_IS_MEM: 227 fpriv->mmap_state = pci_mmap_mem; 228 break; 229 230 case PCIIOC_WRITE_COMBINE: 231 if (arg) 232 fpriv->write_combine = 1; 233 else 234 fpriv->write_combine = 0; 235 break; 236 237 #endif /* HAVE_PCI_MMAP */ 238 239 default: 240 ret = -EINVAL; 241 break; 242 }; 243 244 unlock_kernel(); 245 return ret; 246 } 247 248 #ifdef HAVE_PCI_MMAP 249 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) 250 { 251 struct inode *inode = file->f_path.dentry->d_inode; 252 const struct proc_dir_entry *dp = PDE(inode); 253 struct pci_dev *dev = dp->data; 254 struct pci_filp_private *fpriv = file->private_data; 255 int i, ret; 256 257 if (!capable(CAP_SYS_RAWIO)) 258 return -EPERM; 259 260 /* Make sure the caller is mapping a real resource for this device */ 261 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 262 if (pci_mmap_fits(dev, i, vma)) 263 break; 264 } 265 266 if (i >= PCI_ROM_RESOURCE) 267 return -ENODEV; 268 269 ret = pci_mmap_page_range(dev, vma, 270 fpriv->mmap_state, 271 fpriv->write_combine); 272 if (ret < 0) 273 return ret; 274 275 return 0; 276 } 277 278 static int proc_bus_pci_open(struct inode *inode, struct file *file) 279 { 280 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 281 282 if (!fpriv) 283 return -ENOMEM; 284 285 fpriv->mmap_state = pci_mmap_io; 286 fpriv->write_combine = 0; 287 288 file->private_data = fpriv; 289 290 return 0; 291 } 292 293 static int proc_bus_pci_release(struct inode *inode, struct file *file) 294 { 295 kfree(file->private_data); 296 file->private_data = NULL; 297 298 return 0; 299 } 300 #endif /* HAVE_PCI_MMAP */ 301 302 static const struct file_operations proc_bus_pci_operations = { 303 .owner = THIS_MODULE, 304 .llseek = proc_bus_pci_lseek, 305 .read = proc_bus_pci_read, 306 .write = proc_bus_pci_write, 307 .unlocked_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 */ 319 static 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 } 330 331 static 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 } 339 340 static 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 } 347 348 static 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 } 386 387 static 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 }; 393 394 static struct proc_dir_entry *proc_bus_pci_dir; 395 396 int 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 e->size = dev->cfg_size; 423 dev->procent = e; 424 425 return 0; 426 } 427 428 int pci_proc_detach_device(struct pci_dev *dev) 429 { 430 struct proc_dir_entry *e; 431 432 if ((e = dev->procent)) { 433 if (atomic_read(&e->count) > 1) 434 return -EBUSY; 435 remove_proc_entry(e->name, dev->bus->procdir); 436 dev->procent = NULL; 437 } 438 return 0; 439 } 440 441 #if 0 442 int pci_proc_attach_bus(struct pci_bus* bus) 443 { 444 struct proc_dir_entry *de = bus->procdir; 445 446 if (!proc_initialized) 447 return -EACCES; 448 449 if (!de) { 450 char name[16]; 451 sprintf(name, "%02x", bus->number); 452 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 453 if (!de) 454 return -ENOMEM; 455 } 456 return 0; 457 } 458 #endif /* 0 */ 459 460 int pci_proc_detach_bus(struct pci_bus* bus) 461 { 462 struct proc_dir_entry *de = bus->procdir; 463 if (de) 464 remove_proc_entry(de->name, proc_bus_pci_dir); 465 return 0; 466 } 467 468 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 469 { 470 return seq_open(file, &proc_bus_pci_devices_op); 471 } 472 static const struct file_operations proc_bus_pci_dev_operations = { 473 .owner = THIS_MODULE, 474 .open = proc_bus_pci_dev_open, 475 .read = seq_read, 476 .llseek = seq_lseek, 477 .release = seq_release, 478 }; 479 480 static int __init pci_proc_init(void) 481 { 482 struct pci_dev *dev = NULL; 483 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 484 proc_create("devices", 0, proc_bus_pci_dir, 485 &proc_bus_pci_dev_operations); 486 proc_initialized = 1; 487 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 488 pci_proc_attach_device(dev); 489 } 490 return 0; 491 } 492 493 device_initcall(pci_proc_init); 494 495