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; 286 char devname[PATH_MAX]; 287 void *mapaddr; 288 struct rte_pci_addr *loc; 289 struct pci_map *maps; 290 291 loc = &dev->addr; 292 maps = uio_res->maps; 293 294 /* update devname for mmap */ 295 snprintf(devname, sizeof(devname), 296 "%s/" PCI_PRI_FMT "/resource%d", 297 rte_pci_get_sysfs_path(), 298 loc->domain, loc->bus, loc->devid, 299 loc->function, res_idx); 300 301 /* allocate memory to keep path */ 302 maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0); 303 if (maps[map_idx].path == NULL) { 304 RTE_LOG(ERR, EAL, "Cannot allocate memory for path: %s\n", 305 strerror(errno)); 306 return -1; 307 } 308 309 /* 310 * open resource file, to mmap it 311 */ 312 fd = open(devname, O_RDWR); 313 if (fd < 0) { 314 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 315 devname, strerror(errno)); 316 goto error; 317 } 318 319 /* try mapping somewhere close to the end of hugepages */ 320 if (pci_map_addr == NULL) 321 pci_map_addr = pci_find_max_end_va(); 322 323 mapaddr = pci_map_resource(pci_map_addr, fd, 0, 324 (size_t)dev->mem_resource[res_idx].len, 0); 325 close(fd); 326 if (mapaddr == MAP_FAILED) 327 goto error; 328 329 pci_map_addr = RTE_PTR_ADD(mapaddr, 330 (size_t)dev->mem_resource[res_idx].len); 331 332 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr; 333 maps[map_idx].size = dev->mem_resource[res_idx].len; 334 maps[map_idx].addr = mapaddr; 335 maps[map_idx].offset = 0; 336 strcpy(maps[map_idx].path, devname); 337 dev->mem_resource[res_idx].addr = mapaddr; 338 339 return 0; 340 341 error: 342 rte_free(maps[map_idx].path); 343 return -1; 344 } 345 346 #if defined(RTE_ARCH_X86) 347 int 348 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 349 struct rte_pci_ioport *p) 350 { 351 char dirname[PATH_MAX]; 352 char filename[PATH_MAX]; 353 int uio_num; 354 unsigned long start; 355 356 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 0); 357 if (uio_num < 0) 358 return -1; 359 360 /* get portio start */ 361 snprintf(filename, sizeof(filename), 362 "%s/portio/port%d/start", dirname, bar); 363 if (eal_parse_sysfs_value(filename, &start) < 0) { 364 RTE_LOG(ERR, EAL, "%s(): cannot parse portio start\n", 365 __func__); 366 return -1; 367 } 368 /* ensure we don't get anything funny here, read/write will cast to 369 * uin16_t */ 370 if (start > UINT16_MAX) 371 return -1; 372 373 /* FIXME only for primary process ? */ 374 if (dev->intr_handle.type == RTE_INTR_HANDLE_UNKNOWN) { 375 376 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num); 377 dev->intr_handle.fd = open(filename, O_RDWR); 378 if (dev->intr_handle.fd < 0) { 379 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", 380 filename, strerror(errno)); 381 return -1; 382 } 383 dev->intr_handle.type = RTE_INTR_HANDLE_UIO; 384 } 385 386 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%lx\n", start); 387 388 p->base = start; 389 p->len = 0; 390 return 0; 391 } 392 #else 393 int 394 pci_uio_ioport_map(struct rte_pci_device *dev, int bar, 395 struct rte_pci_ioport *p) 396 { 397 FILE *f; 398 char buf[BUFSIZ]; 399 char filename[PATH_MAX]; 400 uint64_t phys_addr, end_addr, flags; 401 int fd, i; 402 void *addr; 403 404 /* open and read addresses of the corresponding resource in sysfs */ 405 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource", 406 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 407 dev->addr.devid, dev->addr.function); 408 f = fopen(filename, "r"); 409 if (f == NULL) { 410 RTE_LOG(ERR, EAL, "Cannot open sysfs resource: %s\n", 411 strerror(errno)); 412 return -1; 413 } 414 for (i = 0; i < bar + 1; i++) { 415 if (fgets(buf, sizeof(buf), f) == NULL) { 416 RTE_LOG(ERR, EAL, "Cannot read sysfs resource\n"); 417 goto error; 418 } 419 } 420 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr, 421 &end_addr, &flags) < 0) 422 goto error; 423 if ((flags & IORESOURCE_IO) == 0) { 424 RTE_LOG(ERR, EAL, "BAR %d is not an IO resource\n", bar); 425 goto error; 426 } 427 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource%d", 428 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus, 429 dev->addr.devid, dev->addr.function, bar); 430 431 /* mmap the pci resource */ 432 fd = open(filename, O_RDWR); 433 if (fd < 0) { 434 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename, 435 strerror(errno)); 436 goto error; 437 } 438 addr = mmap(NULL, end_addr + 1, PROT_READ | PROT_WRITE, 439 MAP_SHARED, fd, 0); 440 close(fd); 441 if (addr == MAP_FAILED) { 442 RTE_LOG(ERR, EAL, "Cannot mmap IO port resource: %s\n", 443 strerror(errno)); 444 goto error; 445 } 446 447 /* strangely, the base address is mmap addr + phys_addr */ 448 p->base = (uintptr_t)addr + phys_addr; 449 p->len = end_addr + 1; 450 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%"PRIx64"\n", p->base); 451 fclose(f); 452 453 return 0; 454 455 error: 456 fclose(f); 457 return -1; 458 } 459 #endif 460 461 void 462 pci_uio_ioport_read(struct rte_pci_ioport *p, 463 void *data, size_t len, off_t offset) 464 { 465 uint8_t *d; 466 int size; 467 uintptr_t reg = p->base + offset; 468 469 for (d = data; len > 0; d += size, reg += size, len -= size) { 470 if (len >= 4) { 471 size = 4; 472 #if defined(RTE_ARCH_X86) 473 *(uint32_t *)d = inl(reg); 474 #else 475 *(uint32_t *)d = *(volatile uint32_t *)reg; 476 #endif 477 } else if (len >= 2) { 478 size = 2; 479 #if defined(RTE_ARCH_X86) 480 *(uint16_t *)d = inw(reg); 481 #else 482 *(uint16_t *)d = *(volatile uint16_t *)reg; 483 #endif 484 } else { 485 size = 1; 486 #if defined(RTE_ARCH_X86) 487 *d = inb(reg); 488 #else 489 *d = *(volatile uint8_t *)reg; 490 #endif 491 } 492 } 493 } 494 495 void 496 pci_uio_ioport_write(struct rte_pci_ioport *p, 497 const void *data, size_t len, off_t offset) 498 { 499 const uint8_t *s; 500 int size; 501 uintptr_t reg = p->base + offset; 502 503 for (s = data; len > 0; s += size, reg += size, len -= size) { 504 if (len >= 4) { 505 size = 4; 506 #if defined(RTE_ARCH_X86) 507 outl_p(*(const uint32_t *)s, reg); 508 #else 509 *(volatile uint32_t *)reg = *(const uint32_t *)s; 510 #endif 511 } else if (len >= 2) { 512 size = 2; 513 #if defined(RTE_ARCH_X86) 514 outw_p(*(const uint16_t *)s, reg); 515 #else 516 *(volatile uint16_t *)reg = *(const uint16_t *)s; 517 #endif 518 } else { 519 size = 1; 520 #if defined(RTE_ARCH_X86) 521 outb_p(*s, reg); 522 #else 523 *(volatile uint8_t *)reg = *s; 524 #endif 525 } 526 } 527 } 528 529 int 530 pci_uio_ioport_unmap(struct rte_pci_ioport *p) 531 { 532 #if defined(RTE_ARCH_X86) 533 RTE_SET_USED(p); 534 /* FIXME close intr fd ? */ 535 return 0; 536 #else 537 return munmap((void *)(uintptr_t)p->base, p->len); 538 #endif 539 } 540