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 #include <linux/capability.h> 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_path.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_path.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 = dp->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 struct inode *ino = file->f_path.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 = dp->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 i_size_write(ino, dp->size); 198 return nbytes; 199 } 200 201 struct pci_filp_private { 202 enum pci_mmap_state mmap_state; 203 int write_combine; 204 }; 205 206 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, 207 unsigned long arg) 208 { 209 const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); 210 struct pci_dev *dev = dp->data; 211 #ifdef HAVE_PCI_MMAP 212 struct pci_filp_private *fpriv = file->private_data; 213 #endif /* HAVE_PCI_MMAP */ 214 int ret = 0; 215 216 lock_kernel(); 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 unlock_kernel(); 247 return ret; 248 } 249 250 #ifdef HAVE_PCI_MMAP 251 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) 252 { 253 struct inode *inode = file->f_path.dentry->d_inode; 254 const struct proc_dir_entry *dp = PDE(inode); 255 struct pci_dev *dev = dp->data; 256 struct pci_filp_private *fpriv = file->private_data; 257 int ret; 258 259 if (!capable(CAP_SYS_RAWIO)) 260 return -EPERM; 261 262 ret = pci_mmap_page_range(dev, vma, 263 fpriv->mmap_state, 264 fpriv->write_combine); 265 if (ret < 0) 266 return ret; 267 268 return 0; 269 } 270 271 static int proc_bus_pci_open(struct inode *inode, struct file *file) 272 { 273 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 274 275 if (!fpriv) 276 return -ENOMEM; 277 278 fpriv->mmap_state = pci_mmap_io; 279 fpriv->write_combine = 0; 280 281 file->private_data = fpriv; 282 283 return 0; 284 } 285 286 static int proc_bus_pci_release(struct inode *inode, struct file *file) 287 { 288 kfree(file->private_data); 289 file->private_data = NULL; 290 291 return 0; 292 } 293 #endif /* HAVE_PCI_MMAP */ 294 295 static const struct file_operations proc_bus_pci_operations = { 296 .llseek = proc_bus_pci_lseek, 297 .read = proc_bus_pci_read, 298 .write = proc_bus_pci_write, 299 .unlocked_ioctl = proc_bus_pci_ioctl, 300 #ifdef HAVE_PCI_MMAP 301 .open = proc_bus_pci_open, 302 .release = proc_bus_pci_release, 303 .mmap = proc_bus_pci_mmap, 304 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 305 .get_unmapped_area = get_pci_unmapped_area, 306 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 307 #endif /* HAVE_PCI_MMAP */ 308 }; 309 310 /* iterator */ 311 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 312 { 313 struct pci_dev *dev = NULL; 314 loff_t n = *pos; 315 316 for_each_pci_dev(dev) { 317 if (!n--) 318 break; 319 } 320 return dev; 321 } 322 323 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 324 { 325 struct pci_dev *dev = v; 326 327 (*pos)++; 328 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 329 return dev; 330 } 331 332 static void pci_seq_stop(struct seq_file *m, void *v) 333 { 334 if (v) { 335 struct pci_dev *dev = v; 336 pci_dev_put(dev); 337 } 338 } 339 340 static int show_device(struct seq_file *m, void *v) 341 { 342 const struct pci_dev *dev = v; 343 const struct pci_driver *drv; 344 int i; 345 346 if (dev == NULL) 347 return 0; 348 349 drv = pci_dev_driver(dev); 350 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 351 dev->bus->number, 352 dev->devfn, 353 dev->vendor, 354 dev->device, 355 dev->irq); 356 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ 357 for (i=0; i<7; i++) { 358 resource_size_t start, end; 359 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 360 seq_printf(m, "\t%16llx", 361 (unsigned long long)(start | 362 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 363 } 364 for (i=0; i<7; i++) { 365 resource_size_t start, end; 366 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 367 seq_printf(m, "\t%16llx", 368 dev->resource[i].start < dev->resource[i].end ? 369 (unsigned long long)(end - start) + 1 : 0); 370 } 371 seq_putc(m, '\t'); 372 if (drv) 373 seq_printf(m, "%s", drv->name); 374 seq_putc(m, '\n'); 375 return 0; 376 } 377 378 static const struct seq_operations proc_bus_pci_devices_op = { 379 .start = pci_seq_start, 380 .next = pci_seq_next, 381 .stop = pci_seq_stop, 382 .show = show_device 383 }; 384 385 static struct proc_dir_entry *proc_bus_pci_dir; 386 387 int pci_proc_attach_device(struct pci_dev *dev) 388 { 389 struct pci_bus *bus = dev->bus; 390 struct proc_dir_entry *e; 391 char name[16]; 392 393 if (!proc_initialized) 394 return -EACCES; 395 396 if (!bus->procdir) { 397 if (pci_proc_domain(bus)) { 398 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 399 bus->number); 400 } else { 401 sprintf(name, "%02x", bus->number); 402 } 403 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 404 if (!bus->procdir) 405 return -ENOMEM; 406 } 407 408 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 409 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir); 410 if (!e) 411 return -ENOMEM; 412 e->proc_fops = &proc_bus_pci_operations; 413 e->data = dev; 414 e->size = dev->cfg_size; 415 dev->procent = e; 416 417 return 0; 418 } 419 420 int pci_proc_detach_device(struct pci_dev *dev) 421 { 422 struct proc_dir_entry *e; 423 424 if ((e = dev->procent)) { 425 if (atomic_read(&e->count) > 1) 426 return -EBUSY; 427 remove_proc_entry(e->name, dev->bus->procdir); 428 dev->procent = NULL; 429 } 430 return 0; 431 } 432 433 #if 0 434 int pci_proc_attach_bus(struct pci_bus* bus) 435 { 436 struct proc_dir_entry *de = bus->procdir; 437 438 if (!proc_initialized) 439 return -EACCES; 440 441 if (!de) { 442 char name[16]; 443 sprintf(name, "%02x", bus->number); 444 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 445 if (!de) 446 return -ENOMEM; 447 } 448 return 0; 449 } 450 #endif /* 0 */ 451 452 int pci_proc_detach_bus(struct pci_bus* bus) 453 { 454 struct proc_dir_entry *de = bus->procdir; 455 if (de) 456 remove_proc_entry(de->name, proc_bus_pci_dir); 457 return 0; 458 } 459 460 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 461 { 462 return seq_open(file, &proc_bus_pci_devices_op); 463 } 464 static const struct file_operations proc_bus_pci_dev_operations = { 465 .open = proc_bus_pci_dev_open, 466 .read = seq_read, 467 .llseek = seq_lseek, 468 .release = seq_release, 469 }; 470 471 static int __init pci_proc_init(void) 472 { 473 struct proc_dir_entry *entry; 474 struct pci_dev *dev = NULL; 475 proc_bus_pci_dir = proc_mkdir("pci", proc_bus); 476 entry = create_proc_entry("devices", 0, proc_bus_pci_dir); 477 if (entry) 478 entry->proc_fops = &proc_bus_pci_dev_operations; 479 proc_initialized = 1; 480 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { 481 pci_proc_attach_device(dev); 482 } 483 return 0; 484 } 485 486 __initcall(pci_proc_init); 487 488