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 <linux/uaccess.h> 15 #include <asm/byteorder.h> 16 #include "pci.h" 17 18 static int proc_initialized; /* = 0 */ 19 20 static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence) 21 { 22 struct pci_dev *dev = PDE_DATA(file_inode(file)); 23 return fixed_size_llseek(file, off, whence, dev->cfg_size); 24 } 25 26 static ssize_t proc_bus_pci_read(struct file *file, char __user *buf, 27 size_t nbytes, loff_t *ppos) 28 { 29 struct pci_dev *dev = PDE_DATA(file_inode(file)); 30 unsigned int pos = *ppos; 31 unsigned int cnt, size; 32 33 /* 34 * Normal users can read only the standardized portion of the 35 * configuration space as several chips lock up when trying to read 36 * undefined locations (think of Intel PIIX4 as a typical example). 37 */ 38 39 if (capable(CAP_SYS_ADMIN)) 40 size = dev->cfg_size; 41 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 42 size = 128; 43 else 44 size = 64; 45 46 if (pos >= size) 47 return 0; 48 if (nbytes >= size) 49 nbytes = size; 50 if (pos + nbytes > size) 51 nbytes = size - pos; 52 cnt = nbytes; 53 54 if (!access_ok(VERIFY_WRITE, buf, cnt)) 55 return -EINVAL; 56 57 pci_config_pm_runtime_get(dev); 58 59 if ((pos & 1) && cnt) { 60 unsigned char val; 61 pci_user_read_config_byte(dev, pos, &val); 62 __put_user(val, buf); 63 buf++; 64 pos++; 65 cnt--; 66 } 67 68 if ((pos & 3) && cnt > 2) { 69 unsigned short val; 70 pci_user_read_config_word(dev, pos, &val); 71 __put_user(cpu_to_le16(val), (__le16 __user *) buf); 72 buf += 2; 73 pos += 2; 74 cnt -= 2; 75 } 76 77 while (cnt >= 4) { 78 unsigned int val; 79 pci_user_read_config_dword(dev, pos, &val); 80 __put_user(cpu_to_le32(val), (__le32 __user *) buf); 81 buf += 4; 82 pos += 4; 83 cnt -= 4; 84 } 85 86 if (cnt >= 2) { 87 unsigned short val; 88 pci_user_read_config_word(dev, pos, &val); 89 __put_user(cpu_to_le16(val), (__le16 __user *) buf); 90 buf += 2; 91 pos += 2; 92 cnt -= 2; 93 } 94 95 if (cnt) { 96 unsigned char val; 97 pci_user_read_config_byte(dev, pos, &val); 98 __put_user(val, buf); 99 buf++; 100 pos++; 101 cnt--; 102 } 103 104 pci_config_pm_runtime_put(dev); 105 106 *ppos = pos; 107 return nbytes; 108 } 109 110 static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf, 111 size_t nbytes, loff_t *ppos) 112 { 113 struct inode *ino = file_inode(file); 114 struct pci_dev *dev = PDE_DATA(ino); 115 int pos = *ppos; 116 int size = dev->cfg_size; 117 int cnt; 118 119 if (pos >= size) 120 return 0; 121 if (nbytes >= size) 122 nbytes = size; 123 if (pos + nbytes > size) 124 nbytes = size - pos; 125 cnt = nbytes; 126 127 if (!access_ok(VERIFY_READ, buf, cnt)) 128 return -EINVAL; 129 130 pci_config_pm_runtime_get(dev); 131 132 if ((pos & 1) && cnt) { 133 unsigned char val; 134 __get_user(val, buf); 135 pci_user_write_config_byte(dev, pos, val); 136 buf++; 137 pos++; 138 cnt--; 139 } 140 141 if ((pos & 3) && cnt > 2) { 142 __le16 val; 143 __get_user(val, (__le16 __user *) buf); 144 pci_user_write_config_word(dev, pos, le16_to_cpu(val)); 145 buf += 2; 146 pos += 2; 147 cnt -= 2; 148 } 149 150 while (cnt >= 4) { 151 __le32 val; 152 __get_user(val, (__le32 __user *) buf); 153 pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); 154 buf += 4; 155 pos += 4; 156 cnt -= 4; 157 } 158 159 if (cnt >= 2) { 160 __le16 val; 161 __get_user(val, (__le16 __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 if (cnt) { 169 unsigned char val; 170 __get_user(val, buf); 171 pci_user_write_config_byte(dev, pos, val); 172 buf++; 173 pos++; 174 cnt--; 175 } 176 177 pci_config_pm_runtime_put(dev); 178 179 *ppos = pos; 180 i_size_write(ino, dev->cfg_size); 181 return nbytes; 182 } 183 184 struct pci_filp_private { 185 enum pci_mmap_state mmap_state; 186 int write_combine; 187 }; 188 189 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, 190 unsigned long arg) 191 { 192 struct pci_dev *dev = PDE_DATA(file_inode(file)); 193 #ifdef HAVE_PCI_MMAP 194 struct pci_filp_private *fpriv = file->private_data; 195 #endif /* HAVE_PCI_MMAP */ 196 int ret = 0; 197 198 switch (cmd) { 199 case PCIIOC_CONTROLLER: 200 ret = pci_domain_nr(dev->bus); 201 break; 202 203 #ifdef HAVE_PCI_MMAP 204 case PCIIOC_MMAP_IS_IO: 205 fpriv->mmap_state = pci_mmap_io; 206 break; 207 208 case PCIIOC_MMAP_IS_MEM: 209 fpriv->mmap_state = pci_mmap_mem; 210 break; 211 212 case PCIIOC_WRITE_COMBINE: 213 if (arg) 214 fpriv->write_combine = 1; 215 else 216 fpriv->write_combine = 0; 217 break; 218 219 #endif /* HAVE_PCI_MMAP */ 220 221 default: 222 ret = -EINVAL; 223 break; 224 } 225 226 return ret; 227 } 228 229 #ifdef HAVE_PCI_MMAP 230 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) 231 { 232 struct pci_dev *dev = PDE_DATA(file_inode(file)); 233 struct pci_filp_private *fpriv = file->private_data; 234 int i, ret, write_combine; 235 236 if (!capable(CAP_SYS_RAWIO)) 237 return -EPERM; 238 239 /* Make sure the caller is mapping a real resource for this device */ 240 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 241 if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) 242 break; 243 } 244 245 if (i >= PCI_ROM_RESOURCE) 246 return -ENODEV; 247 248 if (fpriv->mmap_state == pci_mmap_mem) 249 write_combine = fpriv->write_combine; 250 else 251 write_combine = 0; 252 ret = pci_mmap_page_range(dev, vma, 253 fpriv->mmap_state, write_combine); 254 if (ret < 0) 255 return ret; 256 257 return 0; 258 } 259 260 static int proc_bus_pci_open(struct inode *inode, struct file *file) 261 { 262 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); 263 264 if (!fpriv) 265 return -ENOMEM; 266 267 fpriv->mmap_state = pci_mmap_io; 268 fpriv->write_combine = 0; 269 270 file->private_data = fpriv; 271 272 return 0; 273 } 274 275 static int proc_bus_pci_release(struct inode *inode, struct file *file) 276 { 277 kfree(file->private_data); 278 file->private_data = NULL; 279 280 return 0; 281 } 282 #endif /* HAVE_PCI_MMAP */ 283 284 static const struct file_operations proc_bus_pci_operations = { 285 .owner = THIS_MODULE, 286 .llseek = proc_bus_pci_lseek, 287 .read = proc_bus_pci_read, 288 .write = proc_bus_pci_write, 289 .unlocked_ioctl = proc_bus_pci_ioctl, 290 .compat_ioctl = proc_bus_pci_ioctl, 291 #ifdef HAVE_PCI_MMAP 292 .open = proc_bus_pci_open, 293 .release = proc_bus_pci_release, 294 .mmap = proc_bus_pci_mmap, 295 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA 296 .get_unmapped_area = get_pci_unmapped_area, 297 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ 298 #endif /* HAVE_PCI_MMAP */ 299 }; 300 301 /* iterator */ 302 static void *pci_seq_start(struct seq_file *m, loff_t *pos) 303 { 304 struct pci_dev *dev = NULL; 305 loff_t n = *pos; 306 307 for_each_pci_dev(dev) { 308 if (!n--) 309 break; 310 } 311 return dev; 312 } 313 314 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) 315 { 316 struct pci_dev *dev = v; 317 318 (*pos)++; 319 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 320 return dev; 321 } 322 323 static void pci_seq_stop(struct seq_file *m, void *v) 324 { 325 if (v) { 326 struct pci_dev *dev = v; 327 pci_dev_put(dev); 328 } 329 } 330 331 static int show_device(struct seq_file *m, void *v) 332 { 333 const struct pci_dev *dev = v; 334 const struct pci_driver *drv; 335 int i; 336 337 if (dev == NULL) 338 return 0; 339 340 drv = pci_dev_driver(dev); 341 seq_printf(m, "%02x%02x\t%04x%04x\t%x", 342 dev->bus->number, 343 dev->devfn, 344 dev->vendor, 345 dev->device, 346 dev->irq); 347 348 /* only print standard and ROM resources to preserve compatibility */ 349 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 350 resource_size_t start, end; 351 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); 352 seq_printf(m, "\t%16llx", 353 (unsigned long long)(start | 354 (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); 355 } 356 for (i = 0; i <= PCI_ROM_RESOURCE; 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 dev->resource[i].start < dev->resource[i].end ? 361 (unsigned long long)(end - start) + 1 : 0); 362 } 363 seq_putc(m, '\t'); 364 if (drv) 365 seq_printf(m, "%s", drv->name); 366 seq_putc(m, '\n'); 367 return 0; 368 } 369 370 static const struct seq_operations proc_bus_pci_devices_op = { 371 .start = pci_seq_start, 372 .next = pci_seq_next, 373 .stop = pci_seq_stop, 374 .show = show_device 375 }; 376 377 static struct proc_dir_entry *proc_bus_pci_dir; 378 379 int pci_proc_attach_device(struct pci_dev *dev) 380 { 381 struct pci_bus *bus = dev->bus; 382 struct proc_dir_entry *e; 383 char name[16]; 384 385 if (!proc_initialized) 386 return -EACCES; 387 388 if (!bus->procdir) { 389 if (pci_proc_domain(bus)) { 390 sprintf(name, "%04x:%02x", pci_domain_nr(bus), 391 bus->number); 392 } else { 393 sprintf(name, "%02x", bus->number); 394 } 395 bus->procdir = proc_mkdir(name, proc_bus_pci_dir); 396 if (!bus->procdir) 397 return -ENOMEM; 398 } 399 400 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); 401 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, 402 &proc_bus_pci_operations, dev); 403 if (!e) 404 return -ENOMEM; 405 proc_set_size(e, dev->cfg_size); 406 dev->procent = e; 407 408 return 0; 409 } 410 411 int pci_proc_detach_device(struct pci_dev *dev) 412 { 413 proc_remove(dev->procent); 414 dev->procent = NULL; 415 return 0; 416 } 417 418 int pci_proc_detach_bus(struct pci_bus *bus) 419 { 420 proc_remove(bus->procdir); 421 return 0; 422 } 423 424 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) 425 { 426 return seq_open(file, &proc_bus_pci_devices_op); 427 } 428 429 static const struct file_operations proc_bus_pci_dev_operations = { 430 .owner = THIS_MODULE, 431 .open = proc_bus_pci_dev_open, 432 .read = seq_read, 433 .llseek = seq_lseek, 434 .release = seq_release, 435 }; 436 437 static int __init pci_proc_init(void) 438 { 439 struct pci_dev *dev = NULL; 440 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); 441 proc_create("devices", 0, proc_bus_pci_dir, 442 &proc_bus_pci_dev_operations); 443 proc_initialized = 1; 444 for_each_pci_dev(dev) 445 pci_proc_attach_device(dev); 446 447 return 0; 448 } 449 device_initcall(pci_proc_init); 450