1 /* 2 * $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $ 3 * 4 * Procfs interface for the PCI bus. 5 * 6 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/pci.h> 11 #include <linux/module.h> 12 #include <linux/proc_fs.h> 13 #include <linux/seq_file.h> 14 #include <linux/smp_lock.h> 15 16 #include <asm/uaccess.h> 17 #include <asm/byteorder.h> 18 #include "pci.h" 19 20 static int proc_initialized; /* = 0 */ 21 22 static loff_t 23 proc_bus_pci_lseek(struct file *file, loff_t off, int whence) 24 { 25 loff_t new = -1; 26 struct inode *inode = file->f_dentry->d_inode; 27 28 mutex_lock(&inode->i_mutex); 29 switch (whence) { 30 case 0: 31 new = off; 32 break; 33 case 1: 34 new = file->f_pos + off; 35 break; 36 case 2: 37 new = inode->i_size + off; 38 break; 39 } 40 if (new < 0 || new > inode->i_size) 41 new = -EINVAL; 42 else 43 file->f_pos = new; 44 mutex_unlock(&inode->i_mutex); 45 return new; 46 } 47 48 static ssize_t 49 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) 50 { 51 const struct inode *ino = file->f_dentry->d_inode; 52 const struct proc_dir_entry *dp = PDE(ino); 53 struct pci_dev *dev = dp->data; 54 unsigned int pos = *ppos; 55 unsigned int cnt, size; 56 57 /* 58 * Normal users can read only the standardized portion of the 59 * configuration space as several chips lock up when trying to read 60 * undefined locations (think of Intel PIIX4 as a typical example). 61 */ 62 63 if (capable(CAP_SYS_ADMIN)) 64 size = dev->cfg_size; 65 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 66 size = 128; 67 else 68 size = 64; 69 70 if (pos >= size) 71 return 0; 72 if (nbytes >= size) 73 nbytes = size; 74 if (pos + nbytes > size) 75 nbytes = size - pos; 76 cnt = nbytes; 77 78 if (!access_ok(VERIFY_WRITE, buf, cnt)) 79 return -EINVAL; 80 81 if ((pos & 1) && cnt) { 82 unsigned char val; 83 pci_user_read_config_byte(dev, pos, &val); 84 __put_user(val, buf); 85 buf++; 86 pos++; 87 cnt--; 88 } 89 90 if ((pos & 3) && cnt > 2) { 91 unsigned short val; 92 pci_user_read_config_word(dev, pos, &val); 93 __put_user(cpu_to_le16(val), (unsigned short __user *) buf); 94 buf += 2; 95 pos += 2; 96 cnt -= 2; 97 } 98 99 while (cnt >= 4) { 100 unsigned int val; 101 pci_user_read_config_dword(dev, pos, &val); 102 __put_user(cpu_to_le32(val), (unsigned int __user *) buf); 103 buf += 4; 104 pos += 4; 105 cnt -= 4; 106 } 107 108 if (cnt >= 2) { 109 unsigned short val; 110 pci_user_read_config_word(dev, pos, &val); 111 __put_user(cpu_to_le16(val), (unsigned short __user *) buf); 112 buf += 2; 113 pos += 2; 114 cnt -= 2; 115 } 116 117 if (cnt) { 118 unsigned char val; 119 pci_user_read_config_byte(dev, pos, &val); 120 __put_user(val, buf); 121 buf++; 122 pos++; 123 cnt--; 124 } 125 126 *ppos = pos; 127 return nbytes; 128 } 129 130 static ssize_t 131 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos) 132 { 133 const struct inode *ino = file->f_dentry->d_inode; 134 const struct proc_dir_entry *dp = PDE(ino); 135 struct pci_dev *dev = dp->data; 136 int pos = *ppos; 137 int size = dev->cfg_size; 138 int cnt; 139 140 if (pos >= size) 141 return 0; 142 if (nbytes >= size) 143 nbytes = size; 144 if (pos + nbytes > size) 145 nbytes = size - pos; 146 cnt = nbytes; 147 148 if (!access_ok(VERIFY_READ, buf, cnt)) 149 return -EINVAL; 150 151 if ((pos & 1) && cnt) { 152 unsigned char val; 153 __get_user(val, buf); 154 pci_user_write_config_byte(dev, pos, val); 155 buf++; 156 pos++; 157 cnt--; 158 } 159 160 if ((pos & 3) && cnt > 2) { 161 unsigned short val; 162 __get_user(val, (unsigned short __user *) buf); 163 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 164 buf += 2; 165 pos += 2; 166 cnt -= 2; 167 } 168 169 while (cnt >= 4) { 170 unsigned int val; 171 __get_user(val, (unsigned int __user *) buf); 172 pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); 173 buf += 4; 174 pos += 4; 175 cnt -= 4; 176 } 177 178 if (cnt >= 2) { 179 unsigned short val; 180 __get_user(val, (unsigned short __user *) buf); 181 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 182 buf += 2; 183 pos += 2; 184 cnt -= 2; 185 } 186 187 if (cnt) { 188 unsigned char val; 189 __get_user(val, buf); 190 pci_user_write_config_byte(dev, pos, val); 191 buf++; 192 pos++; 193 cnt--; 194 } 195 196 *ppos = pos; 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 int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 206 { 207 const struct proc_dir_entry *dp = PDE(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_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 ret; 253 254 if (!capable(CAP_SYS_RAWIO)) 255 return -EPERM; 256 257 ret = pci_mmap_page_range(dev, vma, 258 fpriv->mmap_state, 259 fpriv->write_combine); 260 if (ret < 0) 261 return ret; 262 263 return 0; 264 } 265 266 static int proc_bus_pci_open(struct inode *inode, struct file *file) 267 { 268 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 269 270 if (!fpriv) 271 return -ENOMEM; 272 273 fpriv->mmap_state = pci_mmap_io; 274 fpriv->write_combine = 0; 275 276 file->private_data = fpriv; 277 278 return 0; 279 } 280 281 static int proc_bus_pci_release(struct inode *inode, struct file *file) 282 { 283 kfree(file->private_data); 284 file->private_data = NULL; 285 286 return 0; 287 } 288 #endif /* HAVE_PCI_MMAP */ 289 290 static struct file_operations proc_bus_pci_operations = { 291 .llseek = proc_bus_pci_lseek, 292 .read = proc_bus_pci_read, 293 .write = proc_bus_pci_write, 294 .ioctl = proc_bus_pci_ioctl, 295 #ifdef HAVE_PCI_MMAP 296 .open = proc_bus_pci_open, 297 .release = proc_bus_pci_release, 298 .mmap = proc_bus_pci_mmap, 299 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 300 .get_unmapped_area = get_pci_unmapped_area, 301 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 302 #endif /* HAVE_PCI_MMAP */ 303 }; 304 305 #if BITS_PER_LONG == 32 306 #define LONG_FORMAT "\t%08lx" 307 #else 308 #define LONG_FORMAT "\t%16lx" 309 #endif 310 311 /* iterator */ 312 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 313 { 314 struct pci_dev *dev = NULL; 315 loff_t n = *pos; 316 317 for_each_pci_dev(dev) { 318 if (!n--) 319 break; 320 } 321 return dev; 322 } 323 324 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 325 { 326 struct pci_dev *dev = v; 327 328 (*pos)++; 329 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 330 return dev; 331 } 332 333 static void pci_seq_stop(struct seq_file *m, void *v) 334 { 335 if (v) { 336 struct pci_dev *dev = v; 337 pci_dev_put(dev); 338 } 339 } 340 341 static int show_device(struct seq_file *m, void *v) 342 { 343 const struct pci_dev *dev = v; 344 const struct pci_driver *drv; 345 int i; 346 347 if (dev == NULL) 348 return 0; 349 350 drv = pci_dev_driver(dev); 351 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 352 dev->bus->number, 353 dev->devfn, 354 dev->vendor, 355 dev->device, 356 dev->irq); 357 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ 358 for (i=0; i<7; i++) { 359 u64 start, end; 360 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 361 seq_printf(m, LONG_FORMAT, 362 ((unsigned long)start) | 363 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)); 364 } 365 for (i=0; i<7; i++) { 366 u64 start, end; 367 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 368 seq_printf(m, LONG_FORMAT, 369 dev->resource[i].start < dev->resource[i].end ? 370 (unsigned long)(end - start) + 1 : 0); 371 } 372 seq_putc(m, '\t'); 373 if (drv) 374 seq_printf(m, "%s", drv->name); 375 seq_putc(m, '\n'); 376 return 0; 377 } 378 379 static struct seq_operations proc_bus_pci_devices_op = { 380 .start = pci_seq_start, 381 .next = pci_seq_next, 382 .stop = pci_seq_stop, 383 .show = show_device 384 }; 385 386 static struct proc_dir_entry *proc_bus_pci_dir; 387 388 int pci_proc_attach_device(struct pci_dev *dev) 389 { 390 struct pci_bus *bus = dev->bus; 391 struct proc_dir_entry *e; 392 char name[16]; 393 394 if (!proc_initialized) 395 return -EACCES; 396 397 if (!bus->procdir) { 398 if (pci_proc_domain(bus)) { 399 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 400 bus->number); 401 } else { 402 sprintf(name, "%02x", bus->number); 403 } 404 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 405 if (!bus->procdir) 406 return -ENOMEM; 407 } 408 409 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 410 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir); 411 if (!e) 412 return -ENOMEM; 413 e->proc_fops = &proc_bus_pci_operations; 414 e->data = dev; 415 e->size = dev->cfg_size; 416 dev->procent = e; 417 418 return 0; 419 } 420 421 int pci_proc_detach_device(struct pci_dev *dev) 422 { 423 struct proc_dir_entry *e; 424 425 if ((e = dev->procent)) { 426 if (atomic_read(&e->count)) 427 return -EBUSY; 428 remove_proc_entry(e->name, dev->bus->procdir); 429 dev->procent = NULL; 430 } 431 return 0; 432 } 433 434 #if 0 435 int pci_proc_attach_bus(struct pci_bus* bus) 436 { 437 struct proc_dir_entry *de = bus->procdir; 438 439 if (!proc_initialized) 440 return -EACCES; 441 442 if (!de) { 443 char name[16]; 444 sprintf(name, "%02x", bus->number); 445 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 446 if (!de) 447 return -ENOMEM; 448 } 449 return 0; 450 } 451 #endif /* 0 */ 452 453 int pci_proc_detach_bus(struct pci_bus* bus) 454 { 455 struct proc_dir_entry *de = bus->procdir; 456 if (de) 457 remove_proc_entry(de->name, proc_bus_pci_dir); 458 return 0; 459 } 460 461 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 462 { 463 return seq_open(file, &proc_bus_pci_devices_op); 464 } 465 static struct file_operations proc_bus_pci_dev_operations = { 466 .open = proc_bus_pci_dev_open, 467 .read = seq_read, 468 .llseek = seq_lseek, 469 .release = seq_release, 470 }; 471 472 static int __init pci_proc_init(void) 473 { 474 struct proc_dir_entry *entry; 475 struct pci_dev *dev = NULL; 476 proc_bus_pci_dir = proc_mkdir("pci", proc_bus); 477 entry = create_proc_entry("devices", 0, proc_bus_pci_dir); 478 if (entry) 479 entry->proc_fops = &proc_bus_pci_dev_operations; 480 proc_initialized = 1; 481 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 482 pci_proc_attach_device(dev); 483 } 484 return 0; 485 } 486 487 __initcall(pci_proc_init); 488 489 #ifdef CONFIG_HOTPLUG 490 EXPORT_SYMBOL(pci_proc_attach_device); 491 EXPORT_SYMBOL(pci_proc_detach_bus); 492 #endif 493 494