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 ret; 256 257 if (!capable(CAP_SYS_RAWIO)) 258 return -EPERM; 259 260 ret = pci_mmap_page_range(dev, vma, 261 fpriv->mmap_state, 262 fpriv->write_combine); 263 if (ret < 0) 264 return ret; 265 266 return 0; 267 } 268 269 static int proc_bus_pci_open(struct inode *inode, struct file *file) 270 { 271 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 272 273 if (!fpriv) 274 return -ENOMEM; 275 276 fpriv->mmap_state = pci_mmap_io; 277 fpriv->write_combine = 0; 278 279 file->private_data = fpriv; 280 281 return 0; 282 } 283 284 static int proc_bus_pci_release(struct inode *inode, struct file *file) 285 { 286 kfree(file->private_data); 287 file->private_data = NULL; 288 289 return 0; 290 } 291 #endif /* HAVE_PCI_MMAP */ 292 293 static const struct file_operations proc_bus_pci_operations = { 294 .owner = THIS_MODULE, 295 .llseek = proc_bus_pci_lseek, 296 .read = proc_bus_pci_read, 297 .write = proc_bus_pci_write, 298 .unlocked_ioctl = proc_bus_pci_ioctl, 299 #ifdef HAVE_PCI_MMAP 300 .open = proc_bus_pci_open, 301 .release = proc_bus_pci_release, 302 .mmap = proc_bus_pci_mmap, 303 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 304 .get_unmapped_area = get_pci_unmapped_area, 305 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 306 #endif /* HAVE_PCI_MMAP */ 307 }; 308 309 /* iterator */ 310 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 311 { 312 struct pci_dev *dev = NULL; 313 loff_t n = *pos; 314 315 for_each_pci_dev(dev) { 316 if (!n--) 317 break; 318 } 319 return dev; 320 } 321 322 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 323 { 324 struct pci_dev *dev = v; 325 326 (*pos)++; 327 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 328 return dev; 329 } 330 331 static void pci_seq_stop(struct seq_file *m, void *v) 332 { 333 if (v) { 334 struct pci_dev *dev = v; 335 pci_dev_put(dev); 336 } 337 } 338 339 static int show_device(struct seq_file *m, void *v) 340 { 341 const struct pci_dev *dev = v; 342 const struct pci_driver *drv; 343 int i; 344 345 if (dev == NULL) 346 return 0; 347 348 drv = pci_dev_driver(dev); 349 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 350 dev->bus->number, 351 dev->devfn, 352 dev->vendor, 353 dev->device, 354 dev->irq); 355 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ 356 for (i=0; i<7; i++) { 357 resource_size_t start, end; 358 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 359 seq_printf(m, "\t%16llx", 360 (unsigned long long)(start | 361 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 362 } 363 for (i=0; i<7; i++) { 364 resource_size_t start, end; 365 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 366 seq_printf(m, "\t%16llx", 367 dev->resource[i].start < dev->resource[i].end ? 368 (unsigned long long)(end - start) + 1 : 0); 369 } 370 seq_putc(m, '\t'); 371 if (drv) 372 seq_printf(m, "%s", drv->name); 373 seq_putc(m, '\n'); 374 return 0; 375 } 376 377 static const struct seq_operations proc_bus_pci_devices_op = { 378 .start = pci_seq_start, 379 .next = pci_seq_next, 380 .stop = pci_seq_stop, 381 .show = show_device 382 }; 383 384 static struct proc_dir_entry *proc_bus_pci_dir; 385 386 int pci_proc_attach_device(struct pci_dev *dev) 387 { 388 struct pci_bus *bus = dev->bus; 389 struct proc_dir_entry *e; 390 char name[16]; 391 392 if (!proc_initialized) 393 return -EACCES; 394 395 if (!bus->procdir) { 396 if (pci_proc_domain(bus)) { 397 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 398 bus->number); 399 } else { 400 sprintf(name, "%02x", bus->number); 401 } 402 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 403 if (!bus->procdir) 404 return -ENOMEM; 405 } 406 407 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 408 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, 409 &proc_bus_pci_operations, dev); 410 if (!e) 411 return -ENOMEM; 412 e->size = dev->cfg_size; 413 dev->procent = e; 414 415 return 0; 416 } 417 418 int pci_proc_detach_device(struct pci_dev *dev) 419 { 420 struct proc_dir_entry *e; 421 422 if ((e = dev->procent)) { 423 if (atomic_read(&e->count) > 1) 424 return -EBUSY; 425 remove_proc_entry(e->name, dev->bus->procdir); 426 dev->procent = NULL; 427 } 428 return 0; 429 } 430 431 #if 0 432 int pci_proc_attach_bus(struct pci_bus* bus) 433 { 434 struct proc_dir_entry *de = bus->procdir; 435 436 if (!proc_initialized) 437 return -EACCES; 438 439 if (!de) { 440 char name[16]; 441 sprintf(name, "%02x", bus->number); 442 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 443 if (!de) 444 return -ENOMEM; 445 } 446 return 0; 447 } 448 #endif /* 0 */ 449 450 int pci_proc_detach_bus(struct pci_bus* bus) 451 { 452 struct proc_dir_entry *de = bus->procdir; 453 if (de) 454 remove_proc_entry(de->name, proc_bus_pci_dir); 455 return 0; 456 } 457 458 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 459 { 460 return seq_open(file, &proc_bus_pci_devices_op); 461 } 462 static const struct file_operations proc_bus_pci_dev_operations = { 463 .owner = THIS_MODULE, 464 .open = proc_bus_pci_dev_open, 465 .read = seq_read, 466 .llseek = seq_lseek, 467 .release = seq_release, 468 }; 469 470 static int __init pci_proc_init(void) 471 { 472 struct pci_dev *dev = NULL; 473 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 474 proc_create("devices", 0, proc_bus_pci_dir, 475 &proc_bus_pci_dev_operations); 476 proc_initialized = 1; 477 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 478 pci_proc_attach_device(dev); 479 } 480 return 0; 481 } 482 483 device_initcall(pci_proc_init); 484 485