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/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_inode(file); 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 struct pci_dev *dev = PDE_DATA(file_inode(file)); 50 unsigned int pos = *ppos; 51 unsigned int cnt, size; 52 53 /* 54 * Normal users can read only the standardized portion of the 55 * configuration space as several chips lock up when trying to read 56 * undefined locations (think of Intel PIIX4 as a typical example). 57 */ 58 59 if (capable(CAP_SYS_ADMIN)) 60 size = dev->cfg_size; 61 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 62 size = 128; 63 else 64 size = 64; 65 66 if (pos >= size) 67 return 0; 68 if (nbytes >= size) 69 nbytes = size; 70 if (pos + nbytes > size) 71 nbytes = size - pos; 72 cnt = nbytes; 73 74 if (!access_ok(VERIFY_WRITE, buf, cnt)) 75 return -EINVAL; 76 77 pci_config_pm_runtime_get(dev); 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 pci_config_pm_runtime_put(dev); 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 struct inode *ino = file_inode(file); 134 struct pci_dev *dev = PDE_DATA(ino); 135 int pos = *ppos; 136 int size = dev->cfg_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 pci_config_pm_runtime_get(dev); 151 152 if ((pos & 1) && cnt) { 153 unsigned char val; 154 __get_user(val, buf); 155 pci_user_write_config_byte(dev, pos, val); 156 buf++; 157 pos++; 158 cnt--; 159 } 160 161 if ((pos & 3) && cnt > 2) { 162 __le16 val; 163 __get_user(val, (__le16 __user *) buf); 164 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 165 buf += 2; 166 pos += 2; 167 cnt -= 2; 168 } 169 170 while (cnt >= 4) { 171 __le32 val; 172 __get_user(val, (__le32 __user *) buf); 173 pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); 174 buf += 4; 175 pos += 4; 176 cnt -= 4; 177 } 178 179 if (cnt >= 2) { 180 __le16 val; 181 __get_user(val, (__le16 __user *) buf); 182 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 183 buf += 2; 184 pos += 2; 185 cnt -= 2; 186 } 187 188 if (cnt) { 189 unsigned char val; 190 __get_user(val, buf); 191 pci_user_write_config_byte(dev, pos, val); 192 buf++; 193 pos++; 194 cnt--; 195 } 196 197 pci_config_pm_runtime_put(dev); 198 199 *ppos = pos; 200 i_size_write(ino, dev->cfg_size); 201 return nbytes; 202 } 203 204 struct pci_filp_private { 205 enum pci_mmap_state mmap_state; 206 int write_combine; 207 }; 208 209 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, 210 unsigned long arg) 211 { 212 struct pci_dev *dev = PDE_DATA(file_inode(file)); 213 #ifdef HAVE_PCI_MMAP 214 struct pci_filp_private *fpriv = file->private_data; 215 #endif /* HAVE_PCI_MMAP */ 216 int ret = 0; 217 218 switch (cmd) { 219 case PCIIOC_CONTROLLER: 220 ret = pci_domain_nr(dev->bus); 221 break; 222 223 #ifdef HAVE_PCI_MMAP 224 case PCIIOC_MMAP_IS_IO: 225 fpriv->mmap_state = pci_mmap_io; 226 break; 227 228 case PCIIOC_MMAP_IS_MEM: 229 fpriv->mmap_state = pci_mmap_mem; 230 break; 231 232 case PCIIOC_WRITE_COMBINE: 233 if (arg) 234 fpriv->write_combine = 1; 235 else 236 fpriv->write_combine = 0; 237 break; 238 239 #endif /* HAVE_PCI_MMAP */ 240 241 default: 242 ret = -EINVAL; 243 break; 244 }; 245 246 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 pci_dev *dev = PDE_DATA(file_inode(file)); 253 struct pci_filp_private *fpriv = file->private_data; 254 int i, ret; 255 256 if (!capable(CAP_SYS_RAWIO)) 257 return -EPERM; 258 259 /* Make sure the caller is mapping a real resource for this device */ 260 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 261 if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) 262 break; 263 } 264 265 if (i >= PCI_ROM_RESOURCE) 266 return -ENODEV; 267 268 ret = pci_mmap_page_range(dev, vma, 269 fpriv->mmap_state, 270 fpriv->write_combine); 271 if (ret < 0) 272 return ret; 273 274 return 0; 275 } 276 277 static int proc_bus_pci_open(struct inode *inode, struct file *file) 278 { 279 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 280 281 if (!fpriv) 282 return -ENOMEM; 283 284 fpriv->mmap_state = pci_mmap_io; 285 fpriv->write_combine = 0; 286 287 file->private_data = fpriv; 288 289 return 0; 290 } 291 292 static int proc_bus_pci_release(struct inode *inode, struct file *file) 293 { 294 kfree(file->private_data); 295 file->private_data = NULL; 296 297 return 0; 298 } 299 #endif /* HAVE_PCI_MMAP */ 300 301 static const struct file_operations proc_bus_pci_operations = { 302 .owner = THIS_MODULE, 303 .llseek = proc_bus_pci_lseek, 304 .read = proc_bus_pci_read, 305 .write = proc_bus_pci_write, 306 .unlocked_ioctl = proc_bus_pci_ioctl, 307 .compat_ioctl = proc_bus_pci_ioctl, 308 #ifdef HAVE_PCI_MMAP 309 .open = proc_bus_pci_open, 310 .release = proc_bus_pci_release, 311 .mmap = proc_bus_pci_mmap, 312 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 313 .get_unmapped_area = get_pci_unmapped_area, 314 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 315 #endif /* HAVE_PCI_MMAP */ 316 }; 317 318 /* iterator */ 319 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 320 { 321 struct pci_dev *dev = NULL; 322 loff_t n = *pos; 323 324 for_each_pci_dev(dev) { 325 if (!n--) 326 break; 327 } 328 return dev; 329 } 330 331 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 332 { 333 struct pci_dev *dev = v; 334 335 (*pos)++; 336 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 337 return dev; 338 } 339 340 static void pci_seq_stop(struct seq_file *m, void *v) 341 { 342 if (v) { 343 struct pci_dev *dev = v; 344 pci_dev_put(dev); 345 } 346 } 347 348 static int show_device(struct seq_file *m, void *v) 349 { 350 const struct pci_dev *dev = v; 351 const struct pci_driver *drv; 352 int i; 353 354 if (dev == NULL) 355 return 0; 356 357 drv = pci_dev_driver(dev); 358 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 359 dev->bus->number, 360 dev->devfn, 361 dev->vendor, 362 dev->device, 363 dev->irq); 364 365 /* only print standard and ROM resources to preserve compatibility */ 366 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 367 resource_size_t start, end; 368 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 369 seq_printf(m, "\t%16llx", 370 (unsigned long long)(start | 371 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 372 } 373 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 374 resource_size_t start, end; 375 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 376 seq_printf(m, "\t%16llx", 377 dev->resource[i].start < dev->resource[i].end ? 378 (unsigned long long)(end - start) + 1 : 0); 379 } 380 seq_putc(m, '\t'); 381 if (drv) 382 seq_printf(m, "%s", drv->name); 383 seq_putc(m, '\n'); 384 return 0; 385 } 386 387 static const struct seq_operations proc_bus_pci_devices_op = { 388 .start = pci_seq_start, 389 .next = pci_seq_next, 390 .stop = pci_seq_stop, 391 .show = show_device 392 }; 393 394 static struct proc_dir_entry *proc_bus_pci_dir; 395 396 int pci_proc_attach_device(struct pci_dev *dev) 397 { 398 struct pci_bus *bus = dev->bus; 399 struct proc_dir_entry *e; 400 char name[16]; 401 402 if (!proc_initialized) 403 return -EACCES; 404 405 if (!bus->procdir) { 406 if (pci_proc_domain(bus)) { 407 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 408 bus->number); 409 } else { 410 sprintf(name, "%02x", bus->number); 411 } 412 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 413 if (!bus->procdir) 414 return -ENOMEM; 415 } 416 417 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 418 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, 419 &proc_bus_pci_operations, dev); 420 if (!e) 421 return -ENOMEM; 422 proc_set_size(e, dev->cfg_size); 423 dev->procent = e; 424 425 return 0; 426 } 427 428 int pci_proc_detach_device(struct pci_dev *dev) 429 { 430 proc_remove(dev->procent); 431 dev->procent = NULL; 432 return 0; 433 } 434 435 int pci_proc_detach_bus(struct pci_bus* bus) 436 { 437 proc_remove(bus->procdir); 438 return 0; 439 } 440 441 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 442 { 443 return seq_open(file, &proc_bus_pci_devices_op); 444 } 445 static const struct file_operations proc_bus_pci_dev_operations = { 446 .owner = THIS_MODULE, 447 .open = proc_bus_pci_dev_open, 448 .read = seq_read, 449 .llseek = seq_lseek, 450 .release = seq_release, 451 }; 452 453 static int __init pci_proc_init(void) 454 { 455 struct pci_dev *dev = NULL; 456 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 457 proc_create("devices", 0, proc_bus_pci_dir, 458 &proc_bus_pci_dev_operations); 459 proc_initialized = 1; 460 for_each_pci_dev(dev) 461 pci_proc_attach_device(dev); 462 463 return 0; 464 } 465 466 device_initcall(pci_proc_init); 467 468