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 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 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 246 static 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 } 274 275 static 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 } 289 290 static 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 */ 298 299 static 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 */ 317 static 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 } 328 329 static 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 } 337 338 static 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 } 345 346 static 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 } 384 385 static 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 }; 391 392 static struct proc_dir_entry *proc_bus_pci_dir; 393 394 int 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 } 425 426 int 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 0 438 int 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 */ 455 456 int 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 } 463 464 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 465 { 466 return seq_open(file, &proc_bus_pci_devices_op); 467 } 468 static 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 }; 475 476 static 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 } 488 489 device_initcall(pci_proc_init); 490 491