1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #include <string.h> 6 #include <unistd.h> 7 #include <fcntl.h> 8 #include <dirent.h> 9 #include <inttypes.h> 10 #include <sys/stat.h> 11 #include <sys/mman.h> 12 #include <sys/sysmacros.h> 13 #include <linux/pci_regs.h> 14 15 #if defined(RTE_ARCH_X86) 16 #include <sys/io.h> 17 #endif 18 19 #include <rte_string_fns.h> 20 #include <rte_log.h> 21 #include <rte_pci.h> 22 #include <rte_bus_pci.h> 23 #include <rte_common.h> 24 #include <rte_malloc.h> 25 26 #include "eal_filesystem.h" 27 #include "pci_init.h" 28 29 void *pci_map_addr = NULL; 30 31 #define OFF_MAX ((uint64_t)(off_t)-1) 32 33 int 34 pci_uio_read_config(const struct rte_intr_handle *intr_handle, 35 void *buf, size_t len, off_t offset) 36 { 37 return pread(intr_handle->uio_cfg_fd, buf, len, offset); 38 } 39 40 int 41 pci_uio_write_config(const struct rte_intr_handle *intr_handle, 42 const void *buf, size_t len, off_t offset) 43 { 44 return pwrite(intr_handle->uio_cfg_fd, buf, len, offset); 45 } 46 47 static int 48 pci_uio_set_bus_master(int dev_fd) 49 { 50 uint16_t reg; 51 int ret; 52 53 ret = pread(dev_fd, ®, sizeof(reg), PCI_COMMAND); 54 if (ret != sizeof(reg)) { 55 RTE_LOG(ERR, EAL, 56 "Cannot read command from PCI config space!\n"); 57 return -1; 58 } 59 60 /* return if bus mastering is already on */ 61 if (reg & PCI_COMMAND_MASTER) 62 return 0; 63 64 reg |= PCI_COMMAND_MASTER; 65 66 ret = pwrite(dev_fd, ®, sizeof(reg), PCI_COMMAND); 67 if (ret != sizeof(reg)) { 68 RTE_LOG(ERR, EAL, 69 "Cannot write command to PCI config space!\n"); 70 return -1; 71 } 72 73 return 0; 74 } 75 76 static int 77 pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num) 78 { 79 FILE *f; 80 char filename[PATH_MAX]; 81 int ret; 82 unsigned major, minor; 83 dev_t dev; 84 85 /* get the name of the sysfs file that contains the major and minor 86 * of the uio device and read its content */ 87 snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path); 88 89 f = fopen(filename, "r"); 90 if (f == NULL) { 91 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n", 92 __func__); 93 return -1; 94 } 95 96 ret = fscanf(f, "%u:%u", &major, &minor); 97 if (ret != 2) { 98 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n", 99 __func__); 100 fclose(f); 101 return -1; 102 } 103 fclose(f); 104 105 /* create the char device "mknod /dev/uioX c major minor" */ 106 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num); 107 dev = makedev(major, minor); 108 ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev); 109 if (ret != 0) { 110 RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n", 111 __func__, strerror(errno)); 112 return -1; 113 } 114 115 return ret; 116 } 117 118 /* 119 * Return the uioX char device used for a pci device. On success, return 120 * the UIO number and fill dstbuf string with the path of the device in 121 * sysfs. On error, return a negative value. In this case dstbuf is 122 * invalid. 123 */ 124 static int 125 pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf, 126 unsigned int buflen, int create) 127 { 128 struct rte_pci_addr *loc = &dev->addr; 129 int uio_num = -1; 130 struct dirent *e; 131 DIR *dir; 132 char dirname[PATH_MAX]; 133 134 /* depending on kernel version, uio can be located in uio/uioX 135 * or uio:uioX */ 136 137 snprintf(dirname, sizeof(dirname), 138 "%s/" PCI_PRI_FMT "/uio", rte_pci_get_sysfs_path(), 139 loc->domain, loc->bus, loc->devid, loc->function); 140 141 dir = opendir(dirname); 142 if (dir == NULL) { 143 /* retry with the parent directory */ 144 snprintf(dirname, sizeof(dirname), 145 "%s/" PCI_PRI_FMT, rte_pci_get_sysfs_path(), 146 loc->domain, loc->bus, loc->devid, loc->function); 147 dir = opendir(dirname); 148 149 if (dir == NULL) { 150 RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname); 151 return -1; 152 } 153 } 154 155 /* take the first file starting with "uio" */ 156 while ((e = readdir(dir)) != NULL) { 157 /* format could be uio%d ...*/ 158 int shortprefix_len = sizeof("uio") - 1; 159 /* ... or uio:uio%d */ 160 int longprefix_len = sizeof("uio:uio") - 1; 161 char *endptr; 162 163 if (strncmp(e->d_name, "uio", 3) != 0) 164 continue; 165 166 /* first try uio%d */ 167 errno = 0; 168 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10); 169 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) { 170 snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num); 171 break; 172 } 173 174 /* then try uio:uio%d */ 175 errno = 0; 176 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10); 177 if (errno == 0 && endptr != (e->d_name + longprefix_len)) { 178 snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num); 179 break; 180 } 181 } 182 closedir(dir); 183 184 /* No uio resource found */ 185 if (e == NULL) 186 return -1; 187 188 /* create uio device if we've been asked to */ 189 if (rte_eal_create_uio_dev() && create && 190 pci_mknod_uio_dev(dstbuf, uio_num) < 0) 191 RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num); 192 193 return uio_num; 194 } 195 196 void 197 pci_uio_free_resource(struct rte_pci_device *dev, 198 struct mapped_pci_resource *uio_res) 199 { 200 rte_free(uio_res); 201 202 if (dev->intr_handle.uio_cfg_fd >= 0) { 203 close(dev->intr_handle.uio_cfg_fd); 204 dev->intr_handle.uio_cfg_fd = -1; 205 } 206 if (dev->intr_handle.fd >= 0) { 207 close(dev->intr_handle.fd); 208 dev->intr_handle.fd = -1; 209 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN; 210 } 211 } 212 213 int 214 pci_uio_alloc_resource(struct rte_pci_device *dev, 215 struct mapped_pci_resource **uio_res) 216 { 217 char dirname[PATH_MAX]; 218 char cfgname[PATH_MAX]; 219 char devname[PATH_MAX]; /* contains the /dev/uioX */ 220 int uio_num; 221 struct rte_pci_addr *loc; 222 223 loc = &dev->addr; 224 225 /* find uio resource */ 226 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 1); 227 if (uio_num < 0) { 228 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, " 229 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function); 230 return 1; 231 } 232 snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num); 233 234 /* save fd if in primary process */ 235 dev->intr_handle.fd = open(devname, O_RDWR); 236 if (dev->intr_handle.fd < 0) { 237 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 238 devname, strerror(errno)); 239 goto error; 240 } 241 242 snprintf(cfgname, sizeof(cfgname), 243 "/sys/class/uio/uio%u/device/config", uio_num); 244 dev->intr_handle.uio_cfg_fd = open(cfgname, O_RDWR); 245 if (dev->intr_handle.uio_cfg_fd < 0) { 246 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 247 cfgname, strerror(errno)); 248 goto error; 249 } 250 251 if (dev->kdrv == RTE_KDRV_IGB_UIO) 252 dev->intr_handle.type = RTE_INTR_HANDLE_UIO; 253 else { 254 dev->intr_handle.type = RTE_INTR_HANDLE_UIO_INTX; 255 256 /* set bus master that is not done by uio_pci_generic */ 257 if (pci_uio_set_bus_master(dev->intr_handle.uio_cfg_fd)) { 258 RTE_LOG(ERR, EAL, "Cannot set up bus mastering!\n"); 259 goto error; 260 } 261 } 262 263 /* allocate the mapping details for secondary processes*/ 264 *uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0); 265 if (*uio_res == NULL) { 266 RTE_LOG(ERR, EAL, 267 "%s(): cannot store uio mmap details\n", __func__); 268 goto error; 269 } 270 271 strlcpy((*uio_res)->path, devname, sizeof((*uio_res)->path)); 272 memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr)); 273 274 return 0; 275 276 error: 277 pci_uio_free_resource(dev, *uio_res); 278 return -1; 279 } 280 281 int 282 pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx, 283 struct mapped_pci_resource *uio_res, int map_idx) 284 { 285 int fd = -1; 286 char devname[PATH_MAX]; 287 void *mapaddr; 288 struct rte_pci_addr *loc; 289 struct pci_map *maps; 290 int wc_activate = 0; 291 292 if (dev->driver != NULL) 293 wc_activate = dev->driver->drv_flags & RTE_PCI_DRV_WC_ACTIVATE; 294 295 loc = &dev->addr; 296 maps = uio_res->maps; 297 298 /* allocate memory to keep path */ 299 maps[map_idx].path = rte_malloc(NULL, sizeof(devname), 0); 300 if (maps[map_idx].path == NULL) { 301 RTE_LOG(ERR, EAL, "Cannot allocate memory for path: %s\n", 302 strerror(errno)); 303 return -1; 304 } 305 306 /* 307 * open resource file, to mmap it 308 */ 309 if (wc_activate) { 310 /* update devname for mmap */ 311 snprintf(devname, sizeof(devname), 312 "%s/" PCI_PRI_FMT "/resource%d_wc", 313 rte_pci_get_sysfs_path(), 314 loc->domain, loc->bus, loc->devid, 315 loc->function, res_idx); 316 317 fd = open(devname, O_RDWR); 318 if (fd < 0 && errno != ENOENT) { 319 RTE_LOG(INFO, EAL, "%s cannot be mapped. " 320 "Fall-back to non prefetchable mode.\n", 321 devname); 322 } 323 } 324 325 if (!wc_activate || fd < 0) { 326 snprintf(devname, sizeof(devname), 327 "%s/" PCI_PRI_FMT "/resource%d", 328 rte_pci_get_sysfs_path(), 329 loc->domain, loc->bus, loc->devid, 330 loc->function, res_idx); 331 332 /* then try to map resource file */ 333 fd = open(devname, O_RDWR); 334 if (fd < 0) { 335 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 336 devname, strerror(errno)); 337 goto error; 338 } 339 } 340 341 /* try mapping somewhere close to the end of hugepages */ 342 if (pci_map_addr == NULL) 343 pci_map_addr = pci_find_max_end_va(); 344 345 mapaddr = pci_map_resource(pci_map_addr, fd, 0, 346 (size_t)dev->mem_resource[res_idx].len, 0); 347 close(fd); 348 if (mapaddr == MAP_FAILED) 349 goto error; 350 351 pci_map_addr = RTE_PTR_ADD(mapaddr, 352 (size_t)dev->mem_resource[res_idx].len); 353 354 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr; 355 maps[map_idx].size = dev->mem_resource[res_idx].len; 356 maps[map_idx].addr = mapaddr; 357 maps[map_idx].offset = 0; 358 strcpy(maps[map_idx].path, devname); 359 dev->mem_resource[res_idx].addr = mapaddr; 360 361 return 0; 362 363 error: 364 rte_free(maps[map_idx].path); 365 return -1; 366 } 367 368 #if defined(RTE_ARCH_X86) 369 int 370 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 371 struct rte_pci_ioport *p) 372 { 373 char dirname[PATH_MAX]; 374 char filename[PATH_MAX]; 375 int uio_num; 376 unsigned long start; 377 378 if (rte_eal_iopl_init() != 0) { 379 RTE_LOG(ERR, EAL, "%s(): insufficient ioport permissions for PCI device %s\n", 380 __func__, dev->name); 381 return -1; 382 } 383 384 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 0); 385 if (uio_num < 0) 386 return -1; 387 388 /* get portio start */ 389 snprintf(filename, sizeof(filename), 390 "%s/portio/port%d/start", dirname, bar); 391 if (eal_parse_sysfs_value(filename, &start) < 0) { 392 RTE_LOG(ERR, EAL, "%s(): cannot parse portio start\n", 393 __func__); 394 return -1; 395 } 396 /* ensure we don't get anything funny here, read/write will cast to 397 * uin16_t */ 398 if (start > UINT16_MAX) 399 return -1; 400 401 /* FIXME only for primary process ? */ 402 if (dev->intr_handle.type == RTE_INTR_HANDLE_UNKNOWN) { 403 404 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num); 405 dev->intr_handle.fd = open(filename, O_RDWR); 406 if (dev->intr_handle.fd < 0) { 407 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 408 filename, strerror(errno)); 409 return -1; 410 } 411 dev->intr_handle.type = RTE_INTR_HANDLE_UIO; 412 } 413 414 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%lx\n", start); 415 416 p->base = start; 417 p->len = 0; 418 return 0; 419 } 420 #else 421 int 422 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 423 struct rte_pci_ioport *p) 424 { 425 FILE *f; 426 char buf[BUFSIZ]; 427 char filename[PATH_MAX]; 428 uint64_t phys_addr, end_addr, flags; 429 int fd, i; 430 void *addr; 431 432 /* open and read addresses of the corresponding resource in sysfs */ 433 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource", 434 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 435 dev->addr.devid, dev->addr.function); 436 f = fopen(filename, "r"); 437 if (f == NULL) { 438 RTE_LOG(ERR, EAL, "Cannot open sysfs resource: %s\n", 439 strerror(errno)); 440 return -1; 441 } 442 for (i = 0; i < bar + 1; i++) { 443 if (fgets(buf, sizeof(buf), f) == NULL) { 444 RTE_LOG(ERR, EAL, "Cannot read sysfs resource\n"); 445 goto error; 446 } 447 } 448 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr, 449 &end_addr, &flags) < 0) 450 goto error; 451 if ((flags & IORESOURCE_IO) == 0) { 452 RTE_LOG(ERR, EAL, "BAR %d is not an IO resource\n", bar); 453 goto error; 454 } 455 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource%d", 456 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 457 dev->addr.devid, dev->addr.function, bar); 458 459 /* mmap the pci resource */ 460 fd = open(filename, O_RDWR); 461 if (fd < 0) { 462 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename, 463 strerror(errno)); 464 goto error; 465 } 466 addr = mmap(NULL, end_addr + 1, PROT_READ | PROT_WRITE, 467 MAP_SHARED, fd, 0); 468 close(fd); 469 if (addr == MAP_FAILED) { 470 RTE_LOG(ERR, EAL, "Cannot mmap IO port resource: %s\n", 471 strerror(errno)); 472 goto error; 473 } 474 475 /* strangely, the base address is mmap addr + phys_addr */ 476 p->base = (uintptr_t)addr + phys_addr; 477 p->len = end_addr + 1; 478 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%"PRIx64"\n", p->base); 479 fclose(f); 480 481 return 0; 482 483 error: 484 fclose(f); 485 return -1; 486 } 487 #endif 488 489 void 490 pci_uio_ioport_read(struct rte_pci_ioport *p, 491 void *data, size_t len, off_t offset) 492 { 493 uint8_t *d; 494 int size; 495 uintptr_t reg = p->base + offset; 496 497 for (d = data; len > 0; d += size, reg += size, len -= size) { 498 if (len >= 4) { 499 size = 4; 500 #if defined(RTE_ARCH_X86) 501 *(uint32_t *)d = inl(reg); 502 #else 503 *(uint32_t *)d = *(volatile uint32_t *)reg; 504 #endif 505 } else if (len >= 2) { 506 size = 2; 507 #if defined(RTE_ARCH_X86) 508 *(uint16_t *)d = inw(reg); 509 #else 510 *(uint16_t *)d = *(volatile uint16_t *)reg; 511 #endif 512 } else { 513 size = 1; 514 #if defined(RTE_ARCH_X86) 515 *d = inb(reg); 516 #else 517 *d = *(volatile uint8_t *)reg; 518 #endif 519 } 520 } 521 } 522 523 void 524 pci_uio_ioport_write(struct rte_pci_ioport *p, 525 const void *data, size_t len, off_t offset) 526 { 527 const uint8_t *s; 528 int size; 529 uintptr_t reg = p->base + offset; 530 531 for (s = data; len > 0; s += size, reg += size, len -= size) { 532 if (len >= 4) { 533 size = 4; 534 #if defined(RTE_ARCH_X86) 535 outl_p(*(const uint32_t *)s, reg); 536 #else 537 *(volatile uint32_t *)reg = *(const uint32_t *)s; 538 #endif 539 } else if (len >= 2) { 540 size = 2; 541 #if defined(RTE_ARCH_X86) 542 outw_p(*(const uint16_t *)s, reg); 543 #else 544 *(volatile uint16_t *)reg = *(const uint16_t *)s; 545 #endif 546 } else { 547 size = 1; 548 #if defined(RTE_ARCH_X86) 549 outb_p(*s, reg); 550 #else 551 *(volatile uint8_t *)reg = *s; 552 #endif 553 } 554 } 555 } 556 557 int 558 pci_uio_ioport_unmap(struct rte_pci_ioport *p) 559 { 560 #if defined(RTE_ARCH_X86) 561 RTE_SET_USED(p); 562 /* FIXME close intr fd ? */ 563 return 0; 564 #else 565 return munmap((void *)(uintptr_t)p->base, p->len); 566 #endif 567 } 568