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