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/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), (unsigned short __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), (unsigned int __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), (unsigned short __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 unsigned short val; 161 __get_user(val, (unsigned short __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 unsigned int val; 170 __get_user(val, (unsigned int __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 unsigned short val; 179 __get_user(val, (unsigned short __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 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_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 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 const 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 /* iterator */ 306 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 307 { 308 struct pci_dev *dev = NULL; 309 loff_t n = *pos; 310 311 for_each_pci_dev(dev) { 312 if (!n--) 313 break; 314 } 315 return dev; 316 } 317 318 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 319 { 320 struct pci_dev *dev = v; 321 322 (*pos)++; 323 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 324 return dev; 325 } 326 327 static void pci_seq_stop(struct seq_file *m, void *v) 328 { 329 if (v) { 330 struct pci_dev *dev = v; 331 pci_dev_put(dev); 332 } 333 } 334 335 static int show_device(struct seq_file *m, void *v) 336 { 337 const struct pci_dev *dev = v; 338 const struct pci_driver *drv; 339 int i; 340 341 if (dev == NULL) 342 return 0; 343 344 drv = pci_dev_driver(dev); 345 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 346 dev->bus->number, 347 dev->devfn, 348 dev->vendor, 349 dev->device, 350 dev->irq); 351 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ 352 for (i=0; i<7; i++) { 353 resource_size_t start, end; 354 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 355 seq_printf(m, "\t%16llx", 356 (unsigned long long)(start | 357 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 358 } 359 for (i=0; i<7; i++) { 360 resource_size_t start, end; 361 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 362 seq_printf(m, "\t%16llx", 363 dev->resource[i].start < dev->resource[i].end ? 364 (unsigned long long)(end - start) + 1 : 0); 365 } 366 seq_putc(m, '\t'); 367 if (drv) 368 seq_printf(m, "%s", drv->name); 369 seq_putc(m, '\n'); 370 return 0; 371 } 372 373 static struct seq_operations proc_bus_pci_devices_op = { 374 .start = pci_seq_start, 375 .next = pci_seq_next, 376 .stop = pci_seq_stop, 377 .show = show_device 378 }; 379 380 static struct proc_dir_entry *proc_bus_pci_dir; 381 382 int pci_proc_attach_device(struct pci_dev *dev) 383 { 384 struct pci_bus *bus = dev->bus; 385 struct proc_dir_entry *e; 386 char name[16]; 387 388 if (!proc_initialized) 389 return -EACCES; 390 391 if (!bus->procdir) { 392 if (pci_proc_domain(bus)) { 393 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 394 bus->number); 395 } else { 396 sprintf(name, "%02x", bus->number); 397 } 398 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 399 if (!bus->procdir) 400 return -ENOMEM; 401 } 402 403 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 404 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir); 405 if (!e) 406 return -ENOMEM; 407 e->proc_fops = &proc_bus_pci_operations; 408 e->data = dev; 409 e->size = dev->cfg_size; 410 dev->procent = e; 411 412 return 0; 413 } 414 415 int pci_proc_detach_device(struct pci_dev *dev) 416 { 417 struct proc_dir_entry *e; 418 419 if ((e = dev->procent)) { 420 if (atomic_read(&e->count)) 421 return -EBUSY; 422 remove_proc_entry(e->name, dev->bus->procdir); 423 dev->procent = NULL; 424 } 425 return 0; 426 } 427 428 #if 0 429 int pci_proc_attach_bus(struct pci_bus* bus) 430 { 431 struct proc_dir_entry *de = bus->procdir; 432 433 if (!proc_initialized) 434 return -EACCES; 435 436 if (!de) { 437 char name[16]; 438 sprintf(name, "%02x", bus->number); 439 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 440 if (!de) 441 return -ENOMEM; 442 } 443 return 0; 444 } 445 #endif /* 0 */ 446 447 int pci_proc_detach_bus(struct pci_bus* bus) 448 { 449 struct proc_dir_entry *de = bus->procdir; 450 if (de) 451 remove_proc_entry(de->name, proc_bus_pci_dir); 452 return 0; 453 } 454 455 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 456 { 457 return seq_open(file, &proc_bus_pci_devices_op); 458 } 459 static const struct file_operations proc_bus_pci_dev_operations = { 460 .open = proc_bus_pci_dev_open, 461 .read = seq_read, 462 .llseek = seq_lseek, 463 .release = seq_release, 464 }; 465 466 static int __init pci_proc_init(void) 467 { 468 struct proc_dir_entry *entry; 469 struct pci_dev *dev = NULL; 470 proc_bus_pci_dir = proc_mkdir("pci", proc_bus); 471 entry = create_proc_entry("devices", 0, proc_bus_pci_dir); 472 if (entry) 473 entry->proc_fops = &proc_bus_pci_dev_operations; 474 proc_initialized = 1; 475 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 476 pci_proc_attach_device(dev); 477 } 478 return 0; 479 } 480 481 __initcall(pci_proc_init); 482 483 #ifdef CONFIG_HOTPLUG 484 EXPORT_SYMBOL(pci_proc_detach_bus); 485 #endif 486 487