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 lock_kernel(); 216 217 switch (cmd) { 218 case PCIIOC_CONTROLLER: 219 ret = pci_domain_nr(dev->bus); 220 break; 221 222 #ifdef HAVE_PCI_MMAP 223 case PCIIOC_MMAP_IS_IO: 224 fpriv->mmap_state = pci_mmap_io; 225 break; 226 227 case PCIIOC_MMAP_IS_MEM: 228 fpriv->mmap_state = pci_mmap_mem; 229 break; 230 231 case PCIIOC_WRITE_COMBINE: 232 if (arg) 233 fpriv->write_combine = 1; 234 else 235 fpriv->write_combine = 0; 236 break; 237 238 #endif /* HAVE_PCI_MMAP */ 239 240 default: 241 ret = -EINVAL; 242 break; 243 }; 244 245 unlock_kernel(); 246 return ret; 247 } 248 249 #ifdef HAVE_PCI_MMAP 250 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) 251 { 252 struct inode *inode = file->f_path.dentry->d_inode; 253 const struct proc_dir_entry *dp = PDE(inode); 254 struct pci_dev *dev = dp->data; 255 struct pci_filp_private *fpriv = file->private_data; 256 int i, ret; 257 258 if (!capable(CAP_SYS_RAWIO)) 259 return -EPERM; 260 261 /* Make sure the caller is mapping a real resource for this device */ 262 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 263 if (pci_mmap_fits(dev, i, vma)) 264 break; 265 } 266 267 if (i >= PCI_ROM_RESOURCE) 268 return -ENODEV; 269 270 ret = pci_mmap_page_range(dev, vma, 271 fpriv->mmap_state, 272 fpriv->write_combine); 273 if (ret < 0) 274 return ret; 275 276 return 0; 277 } 278 279 static int proc_bus_pci_open(struct inode *inode, struct file *file) 280 { 281 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 282 283 if (!fpriv) 284 return -ENOMEM; 285 286 fpriv->mmap_state = pci_mmap_io; 287 fpriv->write_combine = 0; 288 289 file->private_data = fpriv; 290 291 return 0; 292 } 293 294 static int proc_bus_pci_release(struct inode *inode, struct file *file) 295 { 296 kfree(file->private_data); 297 file->private_data = NULL; 298 299 return 0; 300 } 301 #endif /* HAVE_PCI_MMAP */ 302 303 static const struct file_operations proc_bus_pci_operations = { 304 .owner = THIS_MODULE, 305 .llseek = proc_bus_pci_lseek, 306 .read = proc_bus_pci_read, 307 .write = proc_bus_pci_write, 308 .unlocked_ioctl = proc_bus_pci_ioctl, 309 #ifdef HAVE_PCI_MMAP 310 .open = proc_bus_pci_open, 311 .release = proc_bus_pci_release, 312 .mmap = proc_bus_pci_mmap, 313 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 314 .get_unmapped_area = get_pci_unmapped_area, 315 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 316 #endif /* HAVE_PCI_MMAP */ 317 }; 318 319 /* iterator */ 320 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 321 { 322 struct pci_dev *dev = NULL; 323 loff_t n = *pos; 324 325 for_each_pci_dev(dev) { 326 if (!n--) 327 break; 328 } 329 return dev; 330 } 331 332 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 333 { 334 struct pci_dev *dev = v; 335 336 (*pos)++; 337 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 338 return dev; 339 } 340 341 static void pci_seq_stop(struct seq_file *m, void *v) 342 { 343 if (v) { 344 struct pci_dev *dev = v; 345 pci_dev_put(dev); 346 } 347 } 348 349 static int show_device(struct seq_file *m, void *v) 350 { 351 const struct pci_dev *dev = v; 352 const struct pci_driver *drv; 353 int i; 354 355 if (dev == NULL) 356 return 0; 357 358 drv = pci_dev_driver(dev); 359 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 360 dev->bus->number, 361 dev->devfn, 362 dev->vendor, 363 dev->device, 364 dev->irq); 365 366 /* only print standard and ROM resources to preserve compatibility */ 367 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 368 resource_size_t start, end; 369 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 370 seq_printf(m, "\t%16llx", 371 (unsigned long long)(start | 372 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 373 } 374 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 375 resource_size_t start, end; 376 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 377 seq_printf(m, "\t%16llx", 378 dev->resource[i].start < dev->resource[i].end ? 379 (unsigned long long)(end - start) + 1 : 0); 380 } 381 seq_putc(m, '\t'); 382 if (drv) 383 seq_printf(m, "%s", drv->name); 384 seq_putc(m, '\n'); 385 return 0; 386 } 387 388 static const struct seq_operations proc_bus_pci_devices_op = { 389 .start = pci_seq_start, 390 .next = pci_seq_next, 391 .stop = pci_seq_stop, 392 .show = show_device 393 }; 394 395 static struct proc_dir_entry *proc_bus_pci_dir; 396 397 int pci_proc_attach_device(struct pci_dev *dev) 398 { 399 struct pci_bus *bus = dev->bus; 400 struct proc_dir_entry *e; 401 char name[16]; 402 403 if (!proc_initialized) 404 return -EACCES; 405 406 if (!bus->procdir) { 407 if (pci_proc_domain(bus)) { 408 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 409 bus->number); 410 } else { 411 sprintf(name, "%02x", bus->number); 412 } 413 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 414 if (!bus->procdir) 415 return -ENOMEM; 416 } 417 418 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 419 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, 420 &proc_bus_pci_operations, dev); 421 if (!e) 422 return -ENOMEM; 423 e->size = dev->cfg_size; 424 dev->procent = e; 425 426 return 0; 427 } 428 429 int pci_proc_detach_device(struct pci_dev *dev) 430 { 431 struct proc_dir_entry *e; 432 433 if ((e = dev->procent)) { 434 if (atomic_read(&e->count) > 1) 435 return -EBUSY; 436 remove_proc_entry(e->name, dev->bus->procdir); 437 dev->procent = NULL; 438 } 439 return 0; 440 } 441 442 #if 0 443 int pci_proc_attach_bus(struct pci_bus* bus) 444 { 445 struct proc_dir_entry *de = bus->procdir; 446 447 if (!proc_initialized) 448 return -EACCES; 449 450 if (!de) { 451 char name[16]; 452 sprintf(name, "%02x", bus->number); 453 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 454 if (!de) 455 return -ENOMEM; 456 } 457 return 0; 458 } 459 #endif /* 0 */ 460 461 int pci_proc_detach_bus(struct pci_bus* bus) 462 { 463 struct proc_dir_entry *de = bus->procdir; 464 if (de) 465 remove_proc_entry(de->name, proc_bus_pci_dir); 466 return 0; 467 } 468 469 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 470 { 471 return seq_open(file, &proc_bus_pci_devices_op); 472 } 473 static const struct file_operations proc_bus_pci_dev_operations = { 474 .owner = THIS_MODULE, 475 .open = proc_bus_pci_dev_open, 476 .read = seq_read, 477 .llseek = seq_lseek, 478 .release = seq_release, 479 }; 480 481 static int __init pci_proc_init(void) 482 { 483 struct pci_dev *dev = NULL; 484 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 485 proc_create("devices", 0, proc_bus_pci_dir, 486 &proc_bus_pci_dev_operations); 487 proc_initialized = 1; 488 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 489 pci_proc_attach_device(dev); 490 } 491 return 0; 492 } 493 494 device_initcall(pci_proc_init); 495 496