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_log.h> 20 #include <rte_pci.h> 21 #include <rte_bus_pci.h> 22 #include <rte_eal_memconfig.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 snprintf((*uio_res)->path, sizeof((*uio_res)->path), "%s", devname); 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 if (access(devname, R_OK|W_OK) != -1) { 318 fd = open(devname, O_RDWR); 319 if (fd < 0) 320 RTE_LOG(INFO, EAL, "%s cannot be mapped. " 321 "Fall-back to non prefetchable mode.\n", 322 devname); 323 } 324 } 325 326 if (!wc_activate || fd < 0) { 327 snprintf(devname, sizeof(devname), 328 "%s/" PCI_PRI_FMT "/resource%d", 329 rte_pci_get_sysfs_path(), 330 loc->domain, loc->bus, loc->devid, 331 loc->function, res_idx); 332 333 /* then try to map resource file */ 334 fd = open(devname, O_RDWR); 335 if (fd < 0) { 336 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 337 devname, strerror(errno)); 338 goto error; 339 } 340 } 341 342 /* try mapping somewhere close to the end of hugepages */ 343 if (pci_map_addr == NULL) 344 pci_map_addr = pci_find_max_end_va(); 345 346 mapaddr = pci_map_resource(pci_map_addr, fd, 0, 347 (size_t)dev->mem_resource[res_idx].len, 0); 348 close(fd); 349 if (mapaddr == MAP_FAILED) 350 goto error; 351 352 pci_map_addr = RTE_PTR_ADD(mapaddr, 353 (size_t)dev->mem_resource[res_idx].len); 354 355 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr; 356 maps[map_idx].size = dev->mem_resource[res_idx].len; 357 maps[map_idx].addr = mapaddr; 358 maps[map_idx].offset = 0; 359 strcpy(maps[map_idx].path, devname); 360 dev->mem_resource[res_idx].addr = mapaddr; 361 362 return 0; 363 364 error: 365 rte_free(maps[map_idx].path); 366 return -1; 367 } 368 369 #if defined(RTE_ARCH_X86) 370 int 371 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 372 struct rte_pci_ioport *p) 373 { 374 char dirname[PATH_MAX]; 375 char filename[PATH_MAX]; 376 int uio_num; 377 unsigned long start; 378 379 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 0); 380 if (uio_num < 0) 381 return -1; 382 383 /* get portio start */ 384 snprintf(filename, sizeof(filename), 385 "%s/portio/port%d/start", dirname, bar); 386 if (eal_parse_sysfs_value(filename, &start) < 0) { 387 RTE_LOG(ERR, EAL, "%s(): cannot parse portio start\n", 388 __func__); 389 return -1; 390 } 391 /* ensure we don't get anything funny here, read/write will cast to 392 * uin16_t */ 393 if (start > UINT16_MAX) 394 return -1; 395 396 /* FIXME only for primary process ? */ 397 if (dev->intr_handle.type == RTE_INTR_HANDLE_UNKNOWN) { 398 399 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num); 400 dev->intr_handle.fd = open(filename, O_RDWR); 401 if (dev->intr_handle.fd < 0) { 402 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 403 filename, strerror(errno)); 404 return -1; 405 } 406 dev->intr_handle.type = RTE_INTR_HANDLE_UIO; 407 } 408 409 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%lx\n", start); 410 411 p->base = start; 412 p->len = 0; 413 return 0; 414 } 415 #else 416 int 417 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 418 struct rte_pci_ioport *p) 419 { 420 FILE *f; 421 char buf[BUFSIZ]; 422 char filename[PATH_MAX]; 423 uint64_t phys_addr, end_addr, flags; 424 int fd, i; 425 void *addr; 426 427 /* open and read addresses of the corresponding resource in sysfs */ 428 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource", 429 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 430 dev->addr.devid, dev->addr.function); 431 f = fopen(filename, "r"); 432 if (f == NULL) { 433 RTE_LOG(ERR, EAL, "Cannot open sysfs resource: %s\n", 434 strerror(errno)); 435 return -1; 436 } 437 for (i = 0; i < bar + 1; i++) { 438 if (fgets(buf, sizeof(buf), f) == NULL) { 439 RTE_LOG(ERR, EAL, "Cannot read sysfs resource\n"); 440 goto error; 441 } 442 } 443 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr, 444 &end_addr, &flags) < 0) 445 goto error; 446 if ((flags & IORESOURCE_IO) == 0) { 447 RTE_LOG(ERR, EAL, "BAR %d is not an IO resource\n", bar); 448 goto error; 449 } 450 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource%d", 451 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 452 dev->addr.devid, dev->addr.function, bar); 453 454 /* mmap the pci resource */ 455 fd = open(filename, O_RDWR); 456 if (fd < 0) { 457 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename, 458 strerror(errno)); 459 goto error; 460 } 461 addr = mmap(NULL, end_addr + 1, PROT_READ | PROT_WRITE, 462 MAP_SHARED, fd, 0); 463 close(fd); 464 if (addr == MAP_FAILED) { 465 RTE_LOG(ERR, EAL, "Cannot mmap IO port resource: %s\n", 466 strerror(errno)); 467 goto error; 468 } 469 470 /* strangely, the base address is mmap addr + phys_addr */ 471 p->base = (uintptr_t)addr + phys_addr; 472 p->len = end_addr + 1; 473 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%"PRIx64"\n", p->base); 474 fclose(f); 475 476 return 0; 477 478 error: 479 fclose(f); 480 return -1; 481 } 482 #endif 483 484 void 485 pci_uio_ioport_read(struct rte_pci_ioport *p, 486 void *data, size_t len, off_t offset) 487 { 488 uint8_t *d; 489 int size; 490 uintptr_t reg = p->base + offset; 491 492 for (d = data; len > 0; d += size, reg += size, len -= size) { 493 if (len >= 4) { 494 size = 4; 495 #if defined(RTE_ARCH_X86) 496 *(uint32_t *)d = inl(reg); 497 #else 498 *(uint32_t *)d = *(volatile uint32_t *)reg; 499 #endif 500 } else if (len >= 2) { 501 size = 2; 502 #if defined(RTE_ARCH_X86) 503 *(uint16_t *)d = inw(reg); 504 #else 505 *(uint16_t *)d = *(volatile uint16_t *)reg; 506 #endif 507 } else { 508 size = 1; 509 #if defined(RTE_ARCH_X86) 510 *d = inb(reg); 511 #else 512 *d = *(volatile uint8_t *)reg; 513 #endif 514 } 515 } 516 } 517 518 void 519 pci_uio_ioport_write(struct rte_pci_ioport *p, 520 const void *data, size_t len, off_t offset) 521 { 522 const uint8_t *s; 523 int size; 524 uintptr_t reg = p->base + offset; 525 526 for (s = data; len > 0; s += size, reg += size, len -= size) { 527 if (len >= 4) { 528 size = 4; 529 #if defined(RTE_ARCH_X86) 530 outl_p(*(const uint32_t *)s, reg); 531 #else 532 *(volatile uint32_t *)reg = *(const uint32_t *)s; 533 #endif 534 } else if (len >= 2) { 535 size = 2; 536 #if defined(RTE_ARCH_X86) 537 outw_p(*(const uint16_t *)s, reg); 538 #else 539 *(volatile uint16_t *)reg = *(const uint16_t *)s; 540 #endif 541 } else { 542 size = 1; 543 #if defined(RTE_ARCH_X86) 544 outb_p(*s, reg); 545 #else 546 *(volatile uint8_t *)reg = *s; 547 #endif 548 } 549 } 550 } 551 552 int 553 pci_uio_ioport_unmap(struct rte_pci_ioport *p) 554 { 555 #if defined(RTE_ARCH_X86) 556 RTE_SET_USED(p); 557 /* FIXME close intr fd ? */ 558 return 0; 559 #else 560 return munmap((void *)(uintptr_t)p->base, p->len); 561 #endif 562 } 563