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/smp_lock.h> 14 #include <linux/capability.h> 15 #include <asm/uaccess.h> 16 #include <asm/byteorder.h> 17 #include "pci.h" 18 19 static int proc_initialized; /* = 0 */ 20 21 static loff_t 22 proc_bus_pci_lseek(struct file *file, loff_t off, int whence) 23 { 24 loff_t new = -1; 25 struct inode *inode = file->f_path.dentry->d_inode; 26 27 mutex_lock(&inode->i_mutex); 28 switch (whence) { 29 case 0: 30 new = off; 31 break; 32 case 1: 33 new = file->f_pos + off; 34 break; 35 case 2: 36 new = inode->i_size + off; 37 break; 38 } 39 if (new < 0 || new > inode->i_size) 40 new = -EINVAL; 41 else 42 file->f_pos = new; 43 mutex_unlock(&inode->i_mutex); 44 return new; 45 } 46 47 static ssize_t 48 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) 49 { 50 const struct inode *ino = file->f_path.dentry->d_inode; 51 const struct proc_dir_entry *dp = PDE(ino); 52 struct pci_dev *dev = dp->data; 53 unsigned int pos = *ppos; 54 unsigned int cnt, size; 55 56 /* 57 * Normal users can read only the standardized portion of the 58 * configuration space as several chips lock up when trying to read 59 * undefined locations (think of Intel PIIX4 as a typical example). 60 */ 61 62 if (capable(CAP_SYS_ADMIN)) 63 size = dp->size; 64 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 65 size = 128; 66 else 67 size = 64; 68 69 if (pos >= size) 70 return 0; 71 if (nbytes >= size) 72 nbytes = size; 73 if (pos + nbytes > size) 74 nbytes = size - pos; 75 cnt = nbytes; 76 77 if (!access_ok(VERIFY_WRITE, buf, cnt)) 78 return -EINVAL; 79 80 if ((pos & 1) && cnt) { 81 unsigned char val; 82 pci_user_read_config_byte(dev, pos, &val); 83 __put_user(val, buf); 84 buf++; 85 pos++; 86 cnt--; 87 } 88 89 if ((pos & 3) && cnt > 2) { 90 unsigned short val; 91 pci_user_read_config_word(dev, pos, &val); 92 __put_user(cpu_to_le16(val), (__le16 __user *) buf); 93 buf += 2; 94 pos += 2; 95 cnt -= 2; 96 } 97 98 while (cnt >= 4) { 99 unsigned int val; 100 pci_user_read_config_dword(dev, pos, &val); 101 __put_user(cpu_to_le32(val), (__le32 __user *) buf); 102 buf += 4; 103 pos += 4; 104 cnt -= 4; 105 } 106 107 if (cnt >= 2) { 108 unsigned short val; 109 pci_user_read_config_word(dev, pos, &val); 110 __put_user(cpu_to_le16(val), (__le16 __user *) buf); 111 buf += 2; 112 pos += 2; 113 cnt -= 2; 114 } 115 116 if (cnt) { 117 unsigned char val; 118 pci_user_read_config_byte(dev, pos, &val); 119 __put_user(val, buf); 120 buf++; 121 pos++; 122 cnt--; 123 } 124 125 *ppos = pos; 126 return nbytes; 127 } 128 129 static ssize_t 130 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos) 131 { 132 struct inode *ino = file->f_path.dentry->d_inode; 133 const struct proc_dir_entry *dp = PDE(ino); 134 struct pci_dev *dev = dp->data; 135 int pos = *ppos; 136 int size = dp->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 if ((pos & 1) && cnt) { 151 unsigned char val; 152 __get_user(val, buf); 153 pci_user_write_config_byte(dev, pos, val); 154 buf++; 155 pos++; 156 cnt--; 157 } 158 159 if ((pos & 3) && 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 while (cnt >= 4) { 169 __le32 val; 170 __get_user(val, (__le32 __user *) buf); 171 pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); 172 buf += 4; 173 pos += 4; 174 cnt -= 4; 175 } 176 177 if (cnt >= 2) { 178 __le16 val; 179 __get_user(val, (__le16 __user *) buf); 180 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 181 buf += 2; 182 pos += 2; 183 cnt -= 2; 184 } 185 186 if (cnt) { 187 unsigned char val; 188 __get_user(val, buf); 189 pci_user_write_config_byte(dev, pos, val); 190 buf++; 191 pos++; 192 cnt--; 193 } 194 195 *ppos = pos; 196 i_size_write(ino, dp->size); 197 return nbytes; 198 } 199 200 struct pci_filp_private { 201 enum pci_mmap_state mmap_state; 202 int write_combine; 203 }; 204 205 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, 206 unsigned long arg) 207 { 208 const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); 209 struct pci_dev *dev = dp->data; 210 #ifdef HAVE_PCI_MMAP 211 struct pci_filp_private *fpriv = file->private_data; 212 #endif /* HAVE_PCI_MMAP */ 213 int ret = 0; 214 215 switch (cmd) { 216 case PCIIOC_CONTROLLER: 217 ret = pci_domain_nr(dev->bus); 218 break; 219 220 #ifdef HAVE_PCI_MMAP 221 case PCIIOC_MMAP_IS_IO: 222 fpriv->mmap_state = pci_mmap_io; 223 break; 224 225 case PCIIOC_MMAP_IS_MEM: 226 fpriv->mmap_state = pci_mmap_mem; 227 break; 228 229 case PCIIOC_WRITE_COMBINE: 230 if (arg) 231 fpriv->write_combine = 1; 232 else 233 fpriv->write_combine = 0; 234 break; 235 236 #endif /* HAVE_PCI_MMAP */ 237 238 default: 239 ret = -EINVAL; 240 break; 241 }; 242 243 return ret; 244 } 245 246 #ifdef HAVE_PCI_MMAP 247 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) 248 { 249 struct inode *inode = file->f_path.dentry->d_inode; 250 const struct proc_dir_entry *dp = PDE(inode); 251 struct pci_dev *dev = dp->data; 252 struct pci_filp_private *fpriv = file->private_data; 253 int i, ret; 254 255 if (!capable(CAP_SYS_RAWIO)) 256 return -EPERM; 257 258 /* Make sure the caller is mapping a real resource for this device */ 259 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 260 if (pci_mmap_fits(dev, i, vma)) 261 break; 262 } 263 264 if (i >= PCI_ROM_RESOURCE) 265 return -ENODEV; 266 267 ret = pci_mmap_page_range(dev, vma, 268 fpriv->mmap_state, 269 fpriv->write_combine); 270 if (ret < 0) 271 return ret; 272 273 return 0; 274 } 275 276 static int proc_bus_pci_open(struct inode *inode, struct file *file) 277 { 278 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 279 280 if (!fpriv) 281 return -ENOMEM; 282 283 fpriv->mmap_state = pci_mmap_io; 284 fpriv->write_combine = 0; 285 286 file->private_data = fpriv; 287 288 return 0; 289 } 290 291 static int proc_bus_pci_release(struct inode *inode, struct file *file) 292 { 293 kfree(file->private_data); 294 file->private_data = NULL; 295 296 return 0; 297 } 298 #endif /* HAVE_PCI_MMAP */ 299 300 static const struct file_operations proc_bus_pci_operations = { 301 .owner = THIS_MODULE, 302 .llseek = proc_bus_pci_lseek, 303 .read = proc_bus_pci_read, 304 .write = proc_bus_pci_write, 305 .unlocked_ioctl = proc_bus_pci_ioctl, 306 .compat_ioctl = proc_bus_pci_ioctl, 307 #ifdef HAVE_PCI_MMAP 308 .open = proc_bus_pci_open, 309 .release = proc_bus_pci_release, 310 .mmap = proc_bus_pci_mmap, 311 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 312 .get_unmapped_area = get_pci_unmapped_area, 313 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 314 #endif /* HAVE_PCI_MMAP */ 315 }; 316 317 /* iterator */ 318 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 319 { 320 struct pci_dev *dev = NULL; 321 loff_t n = *pos; 322 323 for_each_pci_dev(dev) { 324 if (!n--) 325 break; 326 } 327 return dev; 328 } 329 330 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 331 { 332 struct pci_dev *dev = v; 333 334 (*pos)++; 335 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 336 return dev; 337 } 338 339 static void pci_seq_stop(struct seq_file *m, void *v) 340 { 341 if (v) { 342 struct pci_dev *dev = v; 343 pci_dev_put(dev); 344 } 345 } 346 347 static int show_device(struct seq_file *m, void *v) 348 { 349 const struct pci_dev *dev = v; 350 const struct pci_driver *drv; 351 int i; 352 353 if (dev == NULL) 354 return 0; 355 356 drv = pci_dev_driver(dev); 357 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 358 dev->bus->number, 359 dev->devfn, 360 dev->vendor, 361 dev->device, 362 dev->irq); 363 364 /* only print standard and ROM resources to preserve compatibility */ 365 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 366 resource_size_t start, end; 367 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 368 seq_printf(m, "\t%16llx", 369 (unsigned long long)(start | 370 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 371 } 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 dev->resource[i].start < dev->resource[i].end ? 377 (unsigned long long)(end - start) + 1 : 0); 378 } 379 seq_putc(m, '\t'); 380 if (drv) 381 seq_printf(m, "%s", drv->name); 382 seq_putc(m, '\n'); 383 return 0; 384 } 385 386 static const struct seq_operations proc_bus_pci_devices_op = { 387 .start = pci_seq_start, 388 .next = pci_seq_next, 389 .stop = pci_seq_stop, 390 .show = show_device 391 }; 392 393 static struct proc_dir_entry *proc_bus_pci_dir; 394 395 int pci_proc_attach_device(struct pci_dev *dev) 396 { 397 struct pci_bus *bus = dev->bus; 398 struct proc_dir_entry *e; 399 char name[16]; 400 401 if (!proc_initialized) 402 return -EACCES; 403 404 if (!bus->procdir) { 405 if (pci_proc_domain(bus)) { 406 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 407 bus->number); 408 } else { 409 sprintf(name, "%02x", bus->number); 410 } 411 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 412 if (!bus->procdir) 413 return -ENOMEM; 414 } 415 416 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 417 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, 418 &proc_bus_pci_operations, dev); 419 if (!e) 420 return -ENOMEM; 421 e->size = dev->cfg_size; 422 dev->procent = e; 423 424 return 0; 425 } 426 427 int pci_proc_detach_device(struct pci_dev *dev) 428 { 429 struct proc_dir_entry *e; 430 431 if ((e = dev->procent)) { 432 remove_proc_entry(e->name, dev->bus->procdir); 433 dev->procent = NULL; 434 } 435 return 0; 436 } 437 438 #if 0 439 int pci_proc_attach_bus(struct pci_bus* bus) 440 { 441 struct proc_dir_entry *de = bus->procdir; 442 443 if (!proc_initialized) 444 return -EACCES; 445 446 if (!de) { 447 char name[16]; 448 sprintf(name, "%02x", bus->number); 449 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 450 if (!de) 451 return -ENOMEM; 452 } 453 return 0; 454 } 455 #endif /* 0 */ 456 457 int pci_proc_detach_bus(struct pci_bus* bus) 458 { 459 struct proc_dir_entry *de = bus->procdir; 460 if (de) 461 remove_proc_entry(de->name, proc_bus_pci_dir); 462 return 0; 463 } 464 465 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 466 { 467 return seq_open(file, &proc_bus_pci_devices_op); 468 } 469 static const struct file_operations proc_bus_pci_dev_operations = { 470 .owner = THIS_MODULE, 471 .open = proc_bus_pci_dev_open, 472 .read = seq_read, 473 .llseek = seq_lseek, 474 .release = seq_release, 475 }; 476 477 static int __init pci_proc_init(void) 478 { 479 struct pci_dev *dev = NULL; 480 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 481 proc_create("devices", 0, proc_bus_pci_dir, 482 &proc_bus_pci_dev_operations); 483 proc_initialized = 1; 484 for_each_pci_dev(dev) 485 pci_proc_attach_device(dev); 486 487 return 0; 488 } 489 490 device_initcall(pci_proc_init); 491 492