lib/librte_eal/linuxapp/eal/eal_memory.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 /*   BSD LICENSE
  34  *
  35  *   Copyright(c) 2013 6WIND.
  36  *
  37  *   Redistribution and use in source and binary forms, with or without
  38  *   modification, are permitted provided that the following conditions
  39  *   are met:
  40  *
  41  *     * Redistributions of source code must retain the above copyright
  42  *       notice, this list of conditions and the following disclaimer.
  43  *     * Redistributions in binary form must reproduce the above copyright
  44  *       notice, this list of conditions and the following disclaimer in
  45  *       the documentation and/or other materials provided with the
  46  *       distribution.
  47  *     * Neither the name of 6WIND S.A. nor the names of its
  48  *       contributors may be used to endorse or promote products derived
  49  *       from this software without specific prior written permission.
  50  *
  51  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  57  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  */
  63
  64 #define _FILE_OFFSET_BITS 64
  65 #include <errno.h>
  66 #include <stdarg.h>
  67 #include <stdlib.h>
  68 #include <stdio.h>
  69 #include <stdint.h>
  70 #include <inttypes.h>
  71 #include <string.h>
  72 #include <stdarg.h>
  73 #include <sys/mman.h>
  74 #include <sys/types.h>
  75 #include <sys/stat.h>
  76 #include <sys/queue.h>
  77 #include <sys/file.h>
  78 #include <unistd.h>
  79 #include <limits.h>
  80 #include <errno.h>
  81 #include <sys/ioctl.h>
  82 #include <sys/time.h>
  83 #include <signal.h>
  84 #include <setjmp.h>
  85
  86 #include <rte_log.h>
  87 #include <rte_memory.h>
  88 #include <rte_memzone.h>
  89 #include <rte_launch.h>
  90 #include <rte_eal.h>
  91 #include <rte_eal_memconfig.h>
  92 #include <rte_per_lcore.h>
  93 #include <rte_lcore.h>
  94 #include <rte_common.h>
  95 #include <rte_string_fns.h>
  96
  97 #include "eal_private.h"
  98 #include "eal_internal_cfg.h"
  99 #include "eal_filesystem.h"
 100 #include "eal_hugepages.h"
 101
 102 #define PFN_MASK_SIZE   8
 103
 104 #ifdef RTE_LIBRTE_XEN_DOM0
 105 int rte_xen_dom0_supported(void)
 106 {
 107         return internal_config.xen_dom0_support;
 108 }
 109 #endif
 110
 111 /**
 112  * @file
 113  * Huge page mapping under linux
 114  *
 115  * To reserve a big contiguous amount of memory, we use the hugepage
 116  * feature of linux. For that, we need to have hugetlbfs mounted. This
 117  * code will create many files in this directory (one per page) and
 118  * map them in virtual memory. For each page, we will retrieve its
 119  * physical address and remap it in order to have a virtual contiguous
 120  * zone as well as a physical contiguous zone.
 121  */
 122
 123 static uint64_t baseaddr_offset;
 124
 125 static unsigned proc_pagemap_readable;
 126
 127 #define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
 128
 129 static void
 130 test_proc_pagemap_readable(void)
 131 {
 132         int fd = open("/proc/self/pagemap", O_RDONLY);
 133
 134         if (fd < 0) {
 135                 RTE_LOG(ERR, EAL,
 136                         "Cannot open /proc/self/pagemap: %s. "
 137                         "virt2phys address translation will not work\n",
 138                         strerror(errno));
 139                 return;
 140         }
 141
 142         /* Is readable */
 143         close(fd);
 144         proc_pagemap_readable = 1;
 145 }
 146
 147 /* Lock page in physical memory and prevent from swapping. */
 148 int
 149 rte_mem_lock_page(const void *virt)
 150 {
 151         unsigned long virtual = (unsigned long)virt;
 152         int page_size = getpagesize();
 153         unsigned long aligned = (virtual & ~ (page_size - 1));
 154         return mlock((void*)aligned, page_size);
 155 }
 156
 157 /*
 158  * Get physical address of any mapped virtual address in the current process.
 159  */
 160 phys_addr_t
 161 rte_mem_virt2phy(const void *virtaddr)
 162 {
 163         int fd, retval;
 164         uint64_t page, physaddr;
 165         unsigned long virt_pfn;
 166         int page_size;
 167         off_t offset;
 168
 169         /* when using dom0, /proc/self/pagemap always returns 0, check in
 170          * dpdk memory by browsing the memsegs */
 171         if (rte_xen_dom0_supported()) {
 172                 struct rte_mem_config *mcfg;
 173                 struct rte_memseg *memseg;
 174                 unsigned i;
 175
 176                 mcfg = rte_eal_get_configuration()->mem_config;
 177                 for (i = 0; i < RTE_MAX_MEMSEG; i++) {
 178                         memseg = &mcfg->memseg[i];
 179                         if (memseg->addr == NULL)
 180                                 break;
 181                         if (virtaddr > memseg->addr &&
 182                                         virtaddr < RTE_PTR_ADD(memseg->addr,
 183                                                 memseg->len)) {
 184                                 return memseg->phys_addr +
 185                                         RTE_PTR_DIFF(virtaddr, memseg->addr);
 186                         }
 187                 }
 188
 189                 return RTE_BAD_PHYS_ADDR;
 190         }
 191
 192         /* Cannot parse /proc/self/pagemap, no need to log errors everywhere */
 193         if (!proc_pagemap_readable)
 194                 return RTE_BAD_PHYS_ADDR;
 195
 196         /* standard page size */
 197         page_size = getpagesize();
 198
 199         fd = open("/proc/self/pagemap", O_RDONLY);
 200         if (fd < 0) {
 201                 RTE_LOG(ERR, EAL, "%s(): cannot open /proc/self/pagemap: %s\n",
 202                         __func__, strerror(errno));
 203                 return RTE_BAD_PHYS_ADDR;
 204         }
 205
 206         virt_pfn = (unsigned long)virtaddr / page_size;
 207         offset = sizeof(uint64_t) * virt_pfn;
 208         if (lseek(fd, offset, SEEK_SET) == (off_t) -1) {
 209                 RTE_LOG(ERR, EAL, "%s(): seek error in /proc/self/pagemap: %s\n",
 210                                 __func__, strerror(errno));
 211                 close(fd);
 212                 return RTE_BAD_PHYS_ADDR;
 213         }
 214
 215         retval = read(fd, &page, PFN_MASK_SIZE);
 216         close(fd);
 217         if (retval < 0) {
 218                 RTE_LOG(ERR, EAL, "%s(): cannot read /proc/self/pagemap: %s\n",
 219                                 __func__, strerror(errno));
 220                 return RTE_BAD_PHYS_ADDR;
 221         } else if (retval != PFN_MASK_SIZE) {
 222                 RTE_LOG(ERR, EAL, "%s(): read %d bytes from /proc/self/pagemap "
 223                                 "but expected %d:\n",
 224                                 __func__, retval, PFN_MASK_SIZE);
 225                 return RTE_BAD_PHYS_ADDR;
 226         }
 227
 228         /*
 229          * the pfn (page frame number) are bits 0-54 (see
 230          * pagemap.txt in linux Documentation)
 231          */
 232         physaddr = ((page & 0x7fffffffffffffULL) * page_size)
 233                 + ((unsigned long)virtaddr % page_size);
 234
 235         return physaddr;
 236 }
 237
 238 /*
 239  * For each hugepage in hugepg_tbl, fill the physaddr value. We find
 240  * it by browsing the /proc/self/pagemap special file.
 241  */
 242 static int
 243 find_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
 244 {
 245         unsigned i;
 246         phys_addr_t addr;
 247
 248         for (i = 0; i < hpi->num_pages[0]; i++) {
 249                 addr = rte_mem_virt2phy(hugepg_tbl[i].orig_va);
 250                 if (addr == RTE_BAD_PHYS_ADDR)
 251                         return -1;
 252                 hugepg_tbl[i].physaddr = addr;
 253         }
 254         return 0;
 255 }
 256
 257 /*
 258  * Check whether address-space layout randomization is enabled in
 259  * the kernel. This is important for multi-process as it can prevent
 260  * two processes mapping data to the same virtual address
 261  * Returns:
 262  *    0 - address space randomization disabled
 263  *    1/2 - address space randomization enabled
 264  *    negative error code on error
 265  */
 266 static int
 267 aslr_enabled(void)
 268 {
 269         char c;
 270         int retval, fd = open(RANDOMIZE_VA_SPACE_FILE, O_RDONLY);
 271         if (fd < 0)
 272                 return -errno;
 273         retval = read(fd, &c, 1);
 274         close(fd);
 275         if (retval < 0)
 276                 return -errno;
 277         if (retval == 0)
 278                 return -EIO;
 279         switch (c) {
 280                 case '0' : return 0;
 281                 case '1' : return 1;
 282                 case '2' : return 2;
 283                 default: return -EINVAL;
 284         }
 285 }
 286
 287 /*
 288  * Try to mmap *size bytes in /dev/zero. If it is successful, return the
 289  * pointer to the mmap'd area and keep *size unmodified. Else, retry
 290  * with a smaller zone: decrease *size by hugepage_sz until it reaches
 291  * 0. In this case, return NULL. Note: this function returns an address
 292  * which is a multiple of hugepage size.
 293  */
 294 static void *
 295 get_virtual_area(size_t *size, size_t hugepage_sz)
 296 {
 297         void *addr;
 298         int fd;
 299         long aligned_addr;
 300
 301         if (internal_config.base_virtaddr != 0) {
 302                 addr = (void*) (uintptr_t) (internal_config.base_virtaddr +
 303                                 baseaddr_offset);
 304         }
 305         else addr = NULL;
 306
 307         RTE_LOG(DEBUG, EAL, "Ask a virtual area of 0x%zx bytes\n", *size);
 308
 309         fd = open("/dev/zero", O_RDONLY);
 310         if (fd < 0){
 311                 RTE_LOG(ERR, EAL, "Cannot open /dev/zero\n");
 312                 return NULL;
 313         }
 314         do {
 315                 addr = mmap(addr,
 316                                 (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, fd, 0);
 317                 if (addr == MAP_FAILED)
 318                         *size -= hugepage_sz;
 319         } while (addr == MAP_FAILED && *size > 0);
 320
 321         if (addr == MAP_FAILED) {
 322                 close(fd);
 323                 RTE_LOG(ERR, EAL, "Cannot get a virtual area: %s\n",
 324                         strerror(errno));
 325                 return NULL;
 326         }
 327
 328         munmap(addr, (*size) + hugepage_sz);
 329         close(fd);
 330
 331         /* align addr to a huge page size boundary */
 332         aligned_addr = (long)addr;
 333         aligned_addr += (hugepage_sz - 1);
 334         aligned_addr &= (~(hugepage_sz - 1));
 335         addr = (void *)(aligned_addr);
 336
 337         RTE_LOG(DEBUG, EAL, "Virtual area found at %p (size = 0x%zx)\n",
 338                 addr, *size);
 339
 340         /* increment offset */
 341         baseaddr_offset += *size;
 342
 343         return addr;
 344 }
 345
 346 static sigjmp_buf huge_jmpenv;
 347
 348 static void huge_sigbus_handler(int signo __rte_unused)
 349 {
 350         siglongjmp(huge_jmpenv, 1);
 351 }
 352
 353 /* Put setjmp into a wrap method to avoid compiling error. Any non-volatile,
 354  * non-static local variable in the stack frame calling sigsetjmp might be
 355  * clobbered by a call to longjmp.
 356  */
 357 static int huge_wrap_sigsetjmp(void)
 358 {
 359         return sigsetjmp(huge_jmpenv, 1);
 360 }
 361
 362 /*
 363  * Mmap all hugepages of hugepage table: it first open a file in
 364  * hugetlbfs, then mmap() hugepage_sz data in it. If orig is set, the
 365  * virtual address is stored in hugepg_tbl[i].orig_va, else it is stored
 366  * in hugepg_tbl[i].final_va. The second mapping (when orig is 0) tries to
 367  * map continguous physical blocks in contiguous virtual blocks.
 368  */
 369 static unsigned
 370 map_all_hugepages(struct hugepage_file *hugepg_tbl,
 371                 struct hugepage_info *hpi, int orig)
 372 {
 373         int fd;
 374         unsigned i;
 375         void *virtaddr;
 376         void *vma_addr = NULL;
 377         size_t vma_len = 0;
 378
 379         for (i = 0; i < hpi->num_pages[0]; i++) {
 380                 uint64_t hugepage_sz = hpi->hugepage_sz;
 381
 382                 if (orig) {
 383                         hugepg_tbl[i].file_id = i;
 384                         hugepg_tbl[i].size = hugepage_sz;
 385                         eal_get_hugefile_path(hugepg_tbl[i].filepath,
 386                                         sizeof(hugepg_tbl[i].filepath), hpi->hugedir,
 387                                         hugepg_tbl[i].file_id);
 388                         hugepg_tbl[i].filepath[sizeof(hugepg_tbl[i].filepath) - 1] = '\0';
 389                 }
 390 #ifndef RTE_ARCH_64
 391                 /* for 32-bit systems, don't remap 1G and 16G pages, just reuse
 392                  * original map address as final map address.
 393                  */
 394                 else if ((hugepage_sz == RTE_PGSIZE_1G)
 395                         || (hugepage_sz == RTE_PGSIZE_16G)) {
 396                         hugepg_tbl[i].final_va = hugepg_tbl[i].orig_va;
 397                         hugepg_tbl[i].orig_va = NULL;
 398                         continue;
 399                 }
 400 #endif
 401                 else if (vma_len == 0) {
 402                         unsigned j, num_pages;
 403
 404                         /* reserve a virtual area for next contiguous
 405                          * physical block: count the number of
 406                          * contiguous physical pages. */
 407                         for (j = i+1; j < hpi->num_pages[0] ; j++) {
 408 #ifdef RTE_ARCH_PPC_64
 409                                 /* The physical addresses are sorted in
 410                                  * descending order on PPC64 */
 411                                 if (hugepg_tbl[j].physaddr !=
 412                                     hugepg_tbl[j-1].physaddr - hugepage_sz)
 413                                         break;
 414 #else
 415                                 if (hugepg_tbl[j].physaddr !=
 416                                     hugepg_tbl[j-1].physaddr + hugepage_sz)
 417                                         break;
 418 #endif
 419                         }
 420                         num_pages = j - i;
 421                         vma_len = num_pages * hugepage_sz;
 422
 423                         /* get the biggest virtual memory area up to
 424                          * vma_len. If it fails, vma_addr is NULL, so
 425                          * let the kernel provide the address. */
 426                         vma_addr = get_virtual_area(&vma_len, hpi->hugepage_sz);
 427                         if (vma_addr == NULL)
 428                                 vma_len = hugepage_sz;
 429                 }
 430
 431                 /* try to create hugepage file */
 432                 fd = open(hugepg_tbl[i].filepath, O_CREAT | O_RDWR, 0600);
 433                 if (fd < 0) {
 434                         RTE_LOG(DEBUG, EAL, "%s(): open failed: %s\n", __func__,
 435                                         strerror(errno));
 436                         return i;
 437                 }
 438
 439                 /* map the segment, and populate page tables,
 440                  * the kernel fills this segment with zeros */
 441                 virtaddr = mmap(vma_addr, hugepage_sz, PROT_READ | PROT_WRITE,
 442                                 MAP_SHARED | MAP_POPULATE, fd, 0);
 443                 if (virtaddr == MAP_FAILED) {
 444                         RTE_LOG(DEBUG, EAL, "%s(): mmap failed: %s\n", __func__,
 445                                         strerror(errno));
 446                         close(fd);
 447                         return i;
 448                 }
 449
 450                 if (orig) {
 451                         hugepg_tbl[i].orig_va = virtaddr;
 452                 }
 453                 else {
 454                         hugepg_tbl[i].final_va = virtaddr;
 455                 }
 456
 457                 if (orig) {
 458                         /* In linux, hugetlb limitations, like cgroup, are
 459                          * enforced at fault time instead of mmap(), even
 460                          * with the option of MAP_POPULATE. Kernel will send
 461                          * a SIGBUS signal. To avoid to be killed, save stack
 462                          * environment here, if SIGBUS happens, we can jump
 463                          * back here.
 464                          */
 465                         if (huge_wrap_sigsetjmp()) {
 466                                 RTE_LOG(DEBUG, EAL, "SIGBUS: Cannot mmap more "
 467                                         "hugepages of size %u MB\n",
 468                                         (unsigned)(hugepage_sz / 0x100000));
 469                                 munmap(virtaddr, hugepage_sz);
 470                                 close(fd);
 471                                 unlink(hugepg_tbl[i].filepath);
 472                                 return i;
 473                         }
 474                         *(int *)virtaddr = 0;
 475                 }
 476
 477
 478                 /* set shared flock on the file. */
 479                 if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
 480                         RTE_LOG(DEBUG, EAL, "%s(): Locking file failed:%s \n",
 481                                 __func__, strerror(errno));
 482                         close(fd);
 483                         return i;
 484                 }
 485
 486                 close(fd);
 487
 488                 vma_addr = (char *)vma_addr + hugepage_sz;
 489                 vma_len -= hugepage_sz;
 490         }
 491
 492         return i;
 493 }
 494
 495 /* Unmap all hugepages from original mapping */
 496 static int
 497 unmap_all_hugepages_orig(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
 498 {
 499         unsigned i;
 500         for (i = 0; i < hpi->num_pages[0]; i++) {
 501                 if (hugepg_tbl[i].orig_va) {
 502                         munmap(hugepg_tbl[i].orig_va, hpi->hugepage_sz);
 503                         hugepg_tbl[i].orig_va = NULL;
 504                 }
 505         }
 506         return 0;
 507 }
 508
 509 /*
 510  * Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
 511  * page.
 512  */
 513 static int
 514 find_numasocket(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
 515 {
 516         int socket_id;
 517         char *end, *nodestr;
 518         unsigned i, hp_count = 0;
 519         uint64_t virt_addr;
 520         char buf[BUFSIZ];
 521         char hugedir_str[PATH_MAX];
 522         FILE *f;
 523
 524         f = fopen("/proc/self/numa_maps", "r");
 525         if (f == NULL) {
 526                 RTE_LOG(NOTICE, EAL, "cannot open /proc/self/numa_maps,"
 527                                 " consider that all memory is in socket_id 0\n");
 528                 return 0;
 529         }
 530
 531         snprintf(hugedir_str, sizeof(hugedir_str),
 532                         "%s/%s", hpi->hugedir, internal_config.hugefile_prefix);
 533
 534         /* parse numa map */
 535         while (fgets(buf, sizeof(buf), f) != NULL) {
 536
 537                 /* ignore non huge page */
 538                 if (strstr(buf, " huge ") == NULL &&
 539                                 strstr(buf, hugedir_str) == NULL)
 540                         continue;
 541
 542                 /* get zone addr */
 543                 virt_addr = strtoull(buf, &end, 16);
 544                 if (virt_addr == 0 || end == buf) {
 545                         RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
 546                         goto error;
 547                 }
 548
 549                 /* get node id (socket id) */
 550                 nodestr = strstr(buf, " N");
 551                 if (nodestr == NULL) {
 552                         RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
 553                         goto error;
 554                 }
 555                 nodestr += 2;
 556                 end = strstr(nodestr, "=");
 557                 if (end == NULL) {
 558                         RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
 559                         goto error;
 560                 }
 561                 end[0] = '\0';
 562                 end = NULL;
 563
 564                 socket_id = strtoul(nodestr, &end, 0);
 565                 if ((nodestr[0] == '\0') || (end == NULL) || (*end != '\0')) {
 566                         RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
 567                         goto error;
 568                 }
 569
 570                 /* if we find this page in our mappings, set socket_id */
 571                 for (i = 0; i < hpi->num_pages[0]; i++) {
 572                         void *va = (void *)(unsigned long)virt_addr;
 573                         if (hugepg_tbl[i].orig_va == va) {
 574                                 hugepg_tbl[i].socket_id = socket_id;
 575                                 hp_count++;
 576                         }
 577                 }
 578         }
 579
 580         if (hp_count < hpi->num_pages[0])
 581                 goto error;
 582
 583         fclose(f);
 584         return 0;
 585
 586 error:
 587         fclose(f);
 588         return -1;
 589 }
 590
 591 static int
 592 cmp_physaddr(const void *a, const void *b)
 593 {
 594 #ifndef RTE_ARCH_PPC_64
 595         const struct hugepage_file *p1 = (const struct hugepage_file *)a;
 596         const struct hugepage_file *p2 = (const struct hugepage_file *)b;
 597 #else
 598         /* PowerPC needs memory sorted in reverse order from x86 */
 599         const struct hugepage_file *p1 = (const struct hugepage_file *)b;
 600         const struct hugepage_file *p2 = (const struct hugepage_file *)a;
 601 #endif
 602         if (p1->physaddr < p2->physaddr)
 603                 return -1;
 604         else if (p1->physaddr > p2->physaddr)
 605                 return 1;
 606         else
 607                 return 0;
 608 }
 609
 610 /*
 611  * Uses mmap to create a shared memory area for storage of data
 612  * Used in this file to store the hugepage file map on disk
 613  */
 614 static void *
 615 create_shared_memory(const char *filename, const size_t mem_size)
 616 {
 617         void *retval;
 618         int fd = open(filename, O_CREAT | O_RDWR, 0666);
 619         if (fd < 0)
 620                 return NULL;
 621         if (ftruncate(fd, mem_size) < 0) {
 622                 close(fd);
 623                 return NULL;
 624         }
 625         retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 626         close(fd);
 627         return retval;
 628 }
 629
 630 /*
 631  * this copies *active* hugepages from one hugepage table to another.
 632  * destination is typically the shared memory.
 633  */
 634 static int
 635 copy_hugepages_to_shared_mem(struct hugepage_file * dst, int dest_size,
 636                 const struct hugepage_file * src, int src_size)
 637 {
 638         int src_pos, dst_pos = 0;
 639
 640         for (src_pos = 0; src_pos < src_size; src_pos++) {
 641                 if (src[src_pos].final_va != NULL) {
 642                         /* error on overflow attempt */
 643                         if (dst_pos == dest_size)
 644                                 return -1;
 645                         memcpy(&dst[dst_pos], &src[src_pos], sizeof(struct hugepage_file));
 646                         dst_pos++;
 647                 }
 648         }
 649         return 0;
 650 }
 651
 652 static int
 653 unlink_hugepage_files(struct hugepage_file *hugepg_tbl,
 654                 unsigned num_hp_info)
 655 {
 656         unsigned socket, size;
 657         int page, nrpages = 0;
 658
 659         /* get total number of hugepages */
 660         for (size = 0; size < num_hp_info; size++)
 661                 for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
 662                         nrpages +=
 663                         internal_config.hugepage_info[size].num_pages[socket];
 664
 665         for (page = 0; page < nrpages; page++) {
 666                 struct hugepage_file *hp = &hugepg_tbl[page];
 667
 668                 if (hp->final_va != NULL && unlink(hp->filepath)) {
 669                         RTE_LOG(WARNING, EAL, "%s(): Removing %s failed: %s\n",
 670                                 __func__, hp->filepath, strerror(errno));
 671                 }
 672         }
 673         return 0;
 674 }
 675
 676 /*
 677  * unmaps hugepages that are not going to be used. since we originally allocate
 678  * ALL hugepages (not just those we need), additional unmapping needs to be done.
 679  */
 680 static int
 681 unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
 682                 struct hugepage_info *hpi,
 683                 unsigned num_hp_info)
 684 {
 685         unsigned socket, size;
 686         int page, nrpages = 0;
 687
 688         /* get total number of hugepages */
 689         for (size = 0; size < num_hp_info; size++)
 690                 for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
 691                         nrpages += internal_config.hugepage_info[size].num_pages[socket];
 692
 693         for (size = 0; size < num_hp_info; size++) {
 694                 for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
 695                         unsigned pages_found = 0;
 696
 697                         /* traverse until we have unmapped all the unused pages */
 698                         for (page = 0; page < nrpages; page++) {
 699                                 struct hugepage_file *hp = &hugepg_tbl[page];
 700
 701                                 /* find a page that matches the criteria */
 702                                 if ((hp->size == hpi[size].hugepage_sz) &&
 703                                                 (hp->socket_id == (int) socket)) {
 704
 705                                         /* if we skipped enough pages, unmap the rest */
 706                                         if (pages_found == hpi[size].num_pages[socket]) {
 707                                                 uint64_t unmap_len;
 708
 709                                                 unmap_len = hp->size;
 710
 711                                                 /* get start addr and len of the remaining segment */
 712                                                 munmap(hp->final_va, (size_t) unmap_len);
 713
 714                                                 hp->final_va = NULL;
 715                                                 if (unlink(hp->filepath) == -1) {
 716                                                         RTE_LOG(ERR, EAL, "%s(): Removing %s failed: %s\n",
 717                                                                         __func__, hp->filepath, strerror(errno));
 718                                                         return -1;
 719                                                 }
 720                                         } else {
 721                                                 /* lock the page and skip */
 722                                                 pages_found++;
 723                                         }
 724
 725                                 } /* match page */
 726                         } /* foreach page */
 727                 } /* foreach socket */
 728         } /* foreach pagesize */
 729
 730         return 0;
 731 }
 732
 733 static inline uint64_t
 734 get_socket_mem_size(int socket)
 735 {
 736         uint64_t size = 0;
 737         unsigned i;
 738
 739         for (i = 0; i < internal_config.num_hugepage_sizes; i++){
 740                 struct hugepage_info *hpi = &internal_config.hugepage_info[i];
 741                 if (hpi->hugedir != NULL)
 742                         size += hpi->hugepage_sz * hpi->num_pages[socket];
 743         }
 744
 745         return size;
 746 }
 747
 748 /*
 749  * This function is a NUMA-aware equivalent of calc_num_pages.
 750  * It takes in the list of hugepage sizes and the
 751  * number of pages thereof, and calculates the best number of
 752  * pages of each size to fulfill the request for <memory> ram
 753  */
 754 static int
 755 calc_num_pages_per_socket(uint64_t * memory,
 756                 struct hugepage_info *hp_info,
 757                 struct hugepage_info *hp_used,
 758                 unsigned num_hp_info)
 759 {
 760         unsigned socket, j, i = 0;
 761         unsigned requested, available;
 762         int total_num_pages = 0;
 763         uint64_t remaining_mem, cur_mem;
 764         uint64_t total_mem = internal_config.memory;
 765
 766         if (num_hp_info == 0)
 767                 return -1;
 768
 769         /* if specific memory amounts per socket weren't requested */
 770         if (internal_config.force_sockets == 0) {
 771                 int cpu_per_socket[RTE_MAX_NUMA_NODES];
 772                 size_t default_size, total_size;
 773                 unsigned lcore_id;
 774
 775                 /* Compute number of cores per socket */
 776                 memset(cpu_per_socket, 0, sizeof(cpu_per_socket));
 777                 RTE_LCORE_FOREACH(lcore_id) {
 778                         cpu_per_socket[rte_lcore_to_socket_id(lcore_id)]++;
 779                 }
 780
 781                 /*
 782                  * Automatically spread requested memory amongst detected sockets according
 783                  * to number of cores from cpu mask present on each socket
 784                  */
 785                 total_size = internal_config.memory;
 786                 for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_size != 0; socket++) {
 787
 788                         /* Set memory amount per socket */
 789                         default_size = (internal_config.memory * cpu_per_socket[socket])
 790                                         / rte_lcore_count();
 791
 792                         /* Limit to maximum available memory on socket */
 793                         default_size = RTE_MIN(default_size, get_socket_mem_size(socket));
 794
 795                         /* Update sizes */
 796                         memory[socket] = default_size;
 797                         total_size -= default_size;
 798                 }
 799
 800                 /*
 801                  * If some memory is remaining, try to allocate it by getting all
 802                  * available memory from sockets, one after the other
 803                  */
 804                 for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_size != 0; socket++) {
 805                         /* take whatever is available */
 806                         default_size = RTE_MIN(get_socket_mem_size(socket) - memory[socket],
 807                                                total_size);
 808
 809                         /* Update sizes */
 810                         memory[socket] += default_size;
 811                         total_size -= default_size;
 812                 }
 813         }
 814
 815         for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_mem != 0; socket++) {
 816                 /* skips if the memory on specific socket wasn't requested */
 817                 for (i = 0; i < num_hp_info && memory[socket] != 0; i++){
 818                         hp_used[i].hugedir = hp_info[i].hugedir;
 819                         hp_used[i].num_pages[socket] = RTE_MIN(
 820                                         memory[socket] / hp_info[i].hugepage_sz,
 821                                         hp_info[i].num_pages[socket]);
 822
 823                         cur_mem = hp_used[i].num_pages[socket] *
 824                                         hp_used[i].hugepage_sz;
 825
 826                         memory[socket] -= cur_mem;
 827                         total_mem -= cur_mem;
 828
 829                         total_num_pages += hp_used[i].num_pages[socket];
 830
 831                         /* check if we have met all memory requests */
 832                         if (memory[socket] == 0)
 833                                 break;
 834
 835                         /* check if we have any more pages left at this size, if so
 836                          * move on to next size */
 837                         if (hp_used[i].num_pages[socket] == hp_info[i].num_pages[socket])
 838                                 continue;
 839                         /* At this point we know that there are more pages available that are
 840                          * bigger than the memory we want, so lets see if we can get enough
 841                          * from other page sizes.
 842                          */
 843                         remaining_mem = 0;
 844                         for (j = i+1; j < num_hp_info; j++)
 845                                 remaining_mem += hp_info[j].hugepage_sz *
 846                                 hp_info[j].num_pages[socket];
 847
 848                         /* is there enough other memory, if not allocate another page and quit */
 849                         if (remaining_mem < memory[socket]){
 850                                 cur_mem = RTE_MIN(memory[socket],
 851                                                 hp_info[i].hugepage_sz);
 852                                 memory[socket] -= cur_mem;
 853                                 total_mem -= cur_mem;
 854                                 hp_used[i].num_pages[socket]++;
 855                                 total_num_pages++;
 856                                 break; /* we are done with this socket*/
 857                         }
 858                 }
 859                 /* if we didn't satisfy all memory requirements per socket */
 860                 if (memory[socket] > 0) {
 861                         /* to prevent icc errors */
 862                         requested = (unsigned) (internal_config.socket_mem[socket] /
 863                                         0x100000);
 864                         available = requested -
 865                                         ((unsigned) (memory[socket] / 0x100000));
 866                         RTE_LOG(ERR, EAL, "Not enough memory available on socket %u! "
 867                                         "Requested: %uMB, available: %uMB\n", socket,
 868                                         requested, available);
 869                         return -1;
 870                 }
 871         }
 872
 873         /* if we didn't satisfy total memory requirements */
 874         if (total_mem > 0) {
 875                 requested = (unsigned) (internal_config.memory / 0x100000);
 876                 available = requested - (unsigned) (total_mem / 0x100000);
 877                 RTE_LOG(ERR, EAL, "Not enough memory available! Requested: %uMB,"
 878                                 " available: %uMB\n", requested, available);
 879                 return -1;
 880         }
 881         return total_num_pages;
 882 }
 883
 884 static inline size_t
 885 eal_get_hugepage_mem_size(void)
 886 {
 887         uint64_t size = 0;
 888         unsigned i, j;
 889
 890         for (i = 0; i < internal_config.num_hugepage_sizes; i++) {
 891                 struct hugepage_info *hpi = &internal_config.hugepage_info[i];
 892                 if (hpi->hugedir != NULL) {
 893                         for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
 894                                 size += hpi->hugepage_sz * hpi->num_pages[j];
 895                         }
 896                 }
 897         }
 898
 899         return (size < SIZE_MAX) ? (size_t)(size) : SIZE_MAX;
 900 }
 901
 902 static struct sigaction huge_action_old;
 903 static int huge_need_recover;
 904
 905 static void
 906 huge_register_sigbus(void)
 907 {
 908         sigset_t mask;
 909         struct sigaction action;
 910
 911         sigemptyset(&mask);
 912         sigaddset(&mask, SIGBUS);
 913         action.sa_flags = 0;
 914         action.sa_mask = mask;
 915         action.sa_handler = huge_sigbus_handler;
 916
 917         huge_need_recover = !sigaction(SIGBUS, &action, &huge_action_old);
 918 }
 919
 920 static void
 921 huge_recover_sigbus(void)
 922 {
 923         if (huge_need_recover) {
 924                 sigaction(SIGBUS, &huge_action_old, NULL);
 925                 huge_need_recover = 0;
 926         }
 927 }
 928
 929 /*
 930  * Prepare physical memory mapping: fill configuration structure with
 931  * these infos, return 0 on success.
 932  *  1. map N huge pages in separate files in hugetlbfs
 933  *  2. find associated physical addr
 934  *  3. find associated NUMA socket ID
 935  *  4. sort all huge pages by physical address
 936  *  5. remap these N huge pages in the correct order
 937  *  6. unmap the first mapping
 938  *  7. fill memsegs in configuration with contiguous zones
 939  */
 940 int
 941 rte_eal_hugepage_init(void)
 942 {
 943         struct rte_mem_config *mcfg;
 944         struct hugepage_file *hugepage = NULL, *tmp_hp = NULL;
 945         struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
 946
 947         uint64_t memory[RTE_MAX_NUMA_NODES];
 948
 949         unsigned hp_offset;
 950         int i, j, new_memseg;
 951         int nr_hugefiles, nr_hugepages = 0;
 952         void *addr;
 953
 954         test_proc_pagemap_readable();
 955
 956         memset(used_hp, 0, sizeof(used_hp));
 957
 958         /* get pointer to global configuration */
 959         mcfg = rte_eal_get_configuration()->mem_config;
 960
 961         /* hugetlbfs can be disabled */
 962         if (internal_config.no_hugetlbfs) {
 963                 addr = mmap(NULL, internal_config.memory, PROT_READ | PROT_WRITE,
 964                                 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
 965                 if (addr == MAP_FAILED) {
 966                         RTE_LOG(ERR, EAL, "%s: mmap() failed: %s\n", __func__,
 967                                         strerror(errno));
 968                         return -1;
 969                 }
 970                 mcfg->memseg[0].phys_addr = (phys_addr_t)(uintptr_t)addr;
 971                 mcfg->memseg[0].addr = addr;
 972                 mcfg->memseg[0].hugepage_sz = RTE_PGSIZE_4K;
 973                 mcfg->memseg[0].len = internal_config.memory;
 974                 mcfg->memseg[0].socket_id = 0;
 975                 return 0;
 976         }
 977
 978 /* check if app runs on Xen Dom0 */
 979         if (internal_config.xen_dom0_support) {
 980 #ifdef RTE_LIBRTE_XEN_DOM0
 981                 /* use dom0_mm kernel driver to init memory */
 982                 if (rte_xen_dom0_memory_init() < 0)
 983                         return -1;
 984                 else
 985                         return 0;
 986 #endif
 987         }
 988
 989         /* calculate total number of hugepages available. at this point we haven't
 990          * yet started sorting them so they all are on socket 0 */
 991         for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
 992                 /* meanwhile, also initialize used_hp hugepage sizes in used_hp */
 993                 used_hp[i].hugepage_sz = internal_config.hugepage_info[i].hugepage_sz;
 994
 995                 nr_hugepages += internal_config.hugepage_info[i].num_pages[0];
 996         }
 997
 998         /*
 999          * allocate a memory area for hugepage table.
1000          * this isn't shared memory yet. due to the fact that we need some
1001          * processing done on these pages, shared memory will be created
1002          * at a later stage.
1003          */
1004         tmp_hp = malloc(nr_hugepages * sizeof(struct hugepage_file));
1005         if (tmp_hp == NULL)
1006                 goto fail;
1007
1008         memset(tmp_hp, 0, nr_hugepages * sizeof(struct hugepage_file));
1009
1010         hp_offset = 0; /* where we start the current page size entries */
1011
1012         huge_register_sigbus();
1013
1014         /* map all hugepages and sort them */
1015         for (i = 0; i < (int)internal_config.num_hugepage_sizes; i ++){
1016                 unsigned pages_old, pages_new;
1017                 struct hugepage_info *hpi;
1018
1019                 /*
1020                  * we don't yet mark hugepages as used at this stage, so
1021                  * we just map all hugepages available to the system
1022                  * all hugepages are still located on socket 0
1023                  */
1024                 hpi = &internal_config.hugepage_info[i];
1025
1026                 if (hpi->num_pages[0] == 0)
1027                         continue;
1028
1029                 /* map all hugepages available */
1030                 pages_old = hpi->num_pages[0];
1031                 pages_new = map_all_hugepages(&tmp_hp[hp_offset], hpi, 1);
1032                 if (pages_new < pages_old) {
1033                         RTE_LOG(DEBUG, EAL,
1034                                 "%d not %d hugepages of size %u MB allocated\n",
1035                                 pages_new, pages_old,
1036                                 (unsigned)(hpi->hugepage_sz / 0x100000));
1037
1038                         int pages = pages_old - pages_new;
1039
1040                         nr_hugepages -= pages;
1041                         hpi->num_pages[0] = pages_new;
1042                         if (pages_new == 0)
1043                                 continue;
1044                 }
1045
1046                 /* find physical addresses and sockets for each hugepage */
1047                 if (find_physaddrs(&tmp_hp[hp_offset], hpi) < 0){
1048                         RTE_LOG(DEBUG, EAL, "Failed to find phys addr for %u MB pages\n",
1049                                         (unsigned)(hpi->hugepage_sz / 0x100000));
1050                         goto fail;
1051                 }
1052
1053                 if (find_numasocket(&tmp_hp[hp_offset], hpi) < 0){
1054                         RTE_LOG(DEBUG, EAL, "Failed to find NUMA socket for %u MB pages\n",
1055                                         (unsigned)(hpi->hugepage_sz / 0x100000));
1056                         goto fail;
1057                 }
1058
1059                 qsort(&tmp_hp[hp_offset], hpi->num_pages[0],
1060                       sizeof(struct hugepage_file), cmp_physaddr);
1061
1062                 /* remap all hugepages */
1063                 if (map_all_hugepages(&tmp_hp[hp_offset], hpi, 0) !=
1064                     hpi->num_pages[0]) {
1065                         RTE_LOG(ERR, EAL, "Failed to remap %u MB pages\n",
1066                                         (unsigned)(hpi->hugepage_sz / 0x100000));
1067                         goto fail;
1068                 }
1069
1070                 /* unmap original mappings */
1071                 if (unmap_all_hugepages_orig(&tmp_hp[hp_offset], hpi) < 0)
1072                         goto fail;
1073
1074                 /* we have processed a num of hugepages of this size, so inc offset */
1075                 hp_offset += hpi->num_pages[0];
1076         }
1077
1078         huge_recover_sigbus();
1079
1080         if (internal_config.memory == 0 && internal_config.force_sockets == 0)
1081                 internal_config.memory = eal_get_hugepage_mem_size();
1082
1083         nr_hugefiles = nr_hugepages;
1084
1085
1086         /* clean out the numbers of pages */
1087         for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++)
1088                 for (j = 0; j < RTE_MAX_NUMA_NODES; j++)
1089                         internal_config.hugepage_info[i].num_pages[j] = 0;
1090
1091         /* get hugepages for each socket */
1092         for (i = 0; i < nr_hugefiles; i++) {
1093                 int socket = tmp_hp[i].socket_id;
1094
1095                 /* find a hugepage info with right size and increment num_pages */
1096                 const int nb_hpsizes = RTE_MIN(MAX_HUGEPAGE_SIZES,
1097                                 (int)internal_config.num_hugepage_sizes);
1098                 for (j = 0; j < nb_hpsizes; j++) {
1099                         if (tmp_hp[i].size ==
1100                                         internal_config.hugepage_info[j].hugepage_sz) {
1101                                 internal_config.hugepage_info[j].num_pages[socket]++;
1102                         }
1103                 }
1104         }
1105
1106         /* make a copy of socket_mem, needed for number of pages calculation */
1107         for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
1108                 memory[i] = internal_config.socket_mem[i];
1109
1110         /* calculate final number of pages */
1111         nr_hugepages = calc_num_pages_per_socket(memory,
1112                         internal_config.hugepage_info, used_hp,
1113                         internal_config.num_hugepage_sizes);
1114
1115         /* error if not enough memory available */
1116         if (nr_hugepages < 0)
1117                 goto fail;
1118
1119         /* reporting in! */
1120         for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
1121                 for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
1122                         if (used_hp[i].num_pages[j] > 0) {
1123                                 RTE_LOG(DEBUG, EAL,
1124                                         "Requesting %u pages of size %uMB"
1125                                         " from socket %i\n",
1126                                         used_hp[i].num_pages[j],
1127                                         (unsigned)
1128                                         (used_hp[i].hugepage_sz / 0x100000),
1129                                         j);
1130                         }
1131                 }
1132         }
1133
1134         /* create shared memory */
1135         hugepage = create_shared_memory(eal_hugepage_info_path(),
1136                         nr_hugefiles * sizeof(struct hugepage_file));
1137
1138         if (hugepage == NULL) {
1139                 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
1140                 goto fail;
1141         }
1142         memset(hugepage, 0, nr_hugefiles * sizeof(struct hugepage_file));
1143
1144         /*
1145          * unmap pages that we won't need (looks at used_hp).
1146          * also, sets final_va to NULL on pages that were unmapped.
1147          */
1148         if (unmap_unneeded_hugepages(tmp_hp, used_hp,
1149                         internal_config.num_hugepage_sizes) < 0) {
1150                 RTE_LOG(ERR, EAL, "Unmapping and locking hugepages failed!\n");
1151                 goto fail;
1152         }
1153
1154         /*
1155          * copy stuff from malloc'd hugepage* to the actual shared memory.
1156          * this procedure only copies those hugepages that have final_va
1157          * not NULL. has overflow protection.
1158          */
1159         if (copy_hugepages_to_shared_mem(hugepage, nr_hugefiles,
1160                         tmp_hp, nr_hugefiles) < 0) {
1161                 RTE_LOG(ERR, EAL, "Copying tables to shared memory failed!\n");
1162                 goto fail;
1163         }
1164
1165         /* free the hugepage backing files */
1166         if (internal_config.hugepage_unlink &&
1167                 unlink_hugepage_files(tmp_hp, internal_config.num_hugepage_sizes) < 0) {
1168                 RTE_LOG(ERR, EAL, "Unlinking hugepage files failed!\n");
1169                 goto fail;
1170         }
1171
1172         /* free the temporary hugepage table */
1173         free(tmp_hp);
1174         tmp_hp = NULL;
1175
1176         /* first memseg index shall be 0 after incrementing it below */
1177         j = -1;
1178         for (i = 0; i < nr_hugefiles; i++) {
1179                 new_memseg = 0;
1180
1181                 /* if this is a new section, create a new memseg */
1182                 if (i == 0)
1183                         new_memseg = 1;
1184                 else if (hugepage[i].socket_id != hugepage[i-1].socket_id)
1185                         new_memseg = 1;
1186                 else if (hugepage[i].size != hugepage[i-1].size)
1187                         new_memseg = 1;
1188
1189 #ifdef RTE_ARCH_PPC_64
1190                 /* On PPC64 architecture, the mmap always start from higher
1191                  * virtual address to lower address. Here, both the physical
1192                  * address and virtual address are in descending order */
1193                 else if ((hugepage[i-1].physaddr - hugepage[i].physaddr) !=
1194                     hugepage[i].size)
1195                         new_memseg = 1;
1196                 else if (((unsigned long)hugepage[i-1].final_va -
1197                     (unsigned long)hugepage[i].final_va) != hugepage[i].size)
1198                         new_memseg = 1;
1199 #else
1200                 else if ((hugepage[i].physaddr - hugepage[i-1].physaddr) !=
1201                     hugepage[i].size)
1202                         new_memseg = 1;
1203                 else if (((unsigned long)hugepage[i].final_va -
1204                     (unsigned long)hugepage[i-1].final_va) != hugepage[i].size)
1205                         new_memseg = 1;
1206 #endif
1207
1208                 if (new_memseg) {
1209                         j += 1;
1210                         if (j == RTE_MAX_MEMSEG)
1211                                 break;
1212
1213                         mcfg->memseg[j].phys_addr = hugepage[i].physaddr;
1214                         mcfg->memseg[j].addr = hugepage[i].final_va;
1215                         mcfg->memseg[j].len = hugepage[i].size;
1216                         mcfg->memseg[j].socket_id = hugepage[i].socket_id;
1217                         mcfg->memseg[j].hugepage_sz = hugepage[i].size;
1218                 }
1219                 /* continuation of previous memseg */
1220                 else {
1221 #ifdef RTE_ARCH_PPC_64
1222                 /* Use the phy and virt address of the last page as segment
1223                  * address for IBM Power architecture */
1224                         mcfg->memseg[j].phys_addr = hugepage[i].physaddr;
1225                         mcfg->memseg[j].addr = hugepage[i].final_va;
1226 #endif
1227                         mcfg->memseg[j].len += mcfg->memseg[j].hugepage_sz;
1228                 }
1229                 hugepage[i].memseg_id = j;
1230         }
1231
1232         if (i < nr_hugefiles) {
1233                 RTE_LOG(ERR, EAL, "Can only reserve %d pages "
1234                         "from %d requested\n"
1235                         "Current %s=%d is not enough\n"
1236                         "Please either increase it or request less amount "
1237                         "of memory.\n",
1238                         i, nr_hugefiles, RTE_STR(CONFIG_RTE_MAX_MEMSEG),
1239                         RTE_MAX_MEMSEG);
1240                 goto fail;
1241         }
1242
1243         munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));
1244
1245         return 0;
1246
1247 fail:
1248         huge_recover_sigbus();
1249         free(tmp_hp);
1250         if (hugepage != NULL)
1251                 munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));
1252
1253         return -1;
1254 }
1255
1256 /*
1257  * uses fstat to report the size of a file on disk
1258  */
1259 static off_t
1260 getFileSize(int fd)
1261 {
1262         struct stat st;
1263         if (fstat(fd, &st) < 0)
1264                 return 0;
1265         return st.st_size;
1266 }
1267
1268 /*
1269  * This creates the memory mappings in the secondary process to match that of
1270  * the server process. It goes through each memory segment in the DPDK runtime
1271  * configuration and finds the hugepages which form that segment, mapping them
1272  * in order to form a contiguous block in the virtual memory space
1273  */
1274 int
1275 rte_eal_hugepage_attach(void)
1276 {
1277         const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
1278         struct hugepage_file *hp = NULL;
1279         unsigned num_hp = 0;
1280         unsigned i, s = 0; /* s used to track the segment number */
1281         unsigned max_seg = RTE_MAX_MEMSEG;
1282         off_t size = 0;
1283         int fd, fd_zero = -1, fd_hugepage = -1;
1284
1285         if (aslr_enabled() > 0) {
1286                 RTE_LOG(WARNING, EAL, "WARNING: Address Space Layout Randomization "
1287                                 "(ASLR) is enabled in the kernel.\n");
1288                 RTE_LOG(WARNING, EAL, "   This may cause issues with mapping memory "
1289                                 "into secondary processes\n");
1290         }
1291
1292         test_proc_pagemap_readable();
1293
1294         if (internal_config.xen_dom0_support) {
1295 #ifdef RTE_LIBRTE_XEN_DOM0
1296                 if (rte_xen_dom0_memory_attach() < 0) {
1297                         RTE_LOG(ERR, EAL, "Failed to attach memory segments of primary "
1298                                         "process\n");
1299                         return -1;
1300                 }
1301                 return 0;
1302 #endif
1303         }
1304
1305         fd_zero = open("/dev/zero", O_RDONLY);
1306         if (fd_zero < 0) {
1307                 RTE_LOG(ERR, EAL, "Could not open /dev/zero\n");
1308                 goto error;
1309         }
1310         fd_hugepage = open(eal_hugepage_info_path(), O_RDONLY);
1311         if (fd_hugepage < 0) {
1312                 RTE_LOG(ERR, EAL, "Could not open %s\n", eal_hugepage_info_path());
1313                 goto error;
1314         }
1315
1316         /* map all segments into memory to make sure we get the addrs */
1317         for (s = 0; s < RTE_MAX_MEMSEG; ++s) {
1318                 void *base_addr;
1319
1320                 /*
1321                  * the first memory segment with len==0 is the one that
1322                  * follows the last valid segment.
1323                  */
1324                 if (mcfg->memseg[s].len == 0)
1325                         break;
1326
1327                 /*
1328                  * fdzero is mmapped to get a contiguous block of virtual
1329                  * addresses of the appropriate memseg size.
1330                  * use mmap to get identical addresses as the primary process.
1331                  */
1332                 base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
1333                                  PROT_READ, MAP_PRIVATE, fd_zero, 0);
1334                 if (base_addr == MAP_FAILED ||
1335                     base_addr != mcfg->memseg[s].addr) {
1336                         max_seg = s;
1337                         if (base_addr != MAP_FAILED) {
1338                                 /* errno is stale, don't use */
1339                                 RTE_LOG(ERR, EAL, "Could not mmap %llu bytes "
1340                                         "in /dev/zero at [%p], got [%p] - "
1341                                         "please use '--base-virtaddr' option\n",
1342                                         (unsigned long long)mcfg->memseg[s].len,
1343                                         mcfg->memseg[s].addr, base_addr);
1344                                 munmap(base_addr, mcfg->memseg[s].len);
1345                         } else {
1346                                 RTE_LOG(ERR, EAL, "Could not mmap %llu bytes "
1347                                         "in /dev/zero at [%p]: '%s'\n",
1348                                         (unsigned long long)mcfg->memseg[s].len,
1349                                         mcfg->memseg[s].addr, strerror(errno));
1350                         }
1351                         if (aslr_enabled() > 0) {
1352                                 RTE_LOG(ERR, EAL, "It is recommended to "
1353                                         "disable ASLR in the kernel "
1354                                         "and retry running both primary "
1355                                         "and secondary processes\n");
1356                         }
1357                         goto error;
1358                 }
1359         }
1360
1361         size = getFileSize(fd_hugepage);
1362         hp = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd_hugepage, 0);
1363         if (hp == MAP_FAILED) {
1364                 RTE_LOG(ERR, EAL, "Could not mmap %s\n", eal_hugepage_info_path());
1365                 goto error;
1366         }
1367
1368         num_hp = size / sizeof(struct hugepage_file);
1369         RTE_LOG(DEBUG, EAL, "Analysing %u files\n", num_hp);
1370
1371         s = 0;
1372         while (s < RTE_MAX_MEMSEG && mcfg->memseg[s].len > 0){
1373                 void *addr, *base_addr;
1374                 uintptr_t offset = 0;
1375                 size_t mapping_size;
1376                 /*
1377                  * free previously mapped memory so we can map the
1378                  * hugepages into the space
1379                  */
1380                 base_addr = mcfg->memseg[s].addr;
1381                 munmap(base_addr, mcfg->memseg[s].len);
1382
1383                 /* find the hugepages for this segment and map them
1384                  * we don't need to worry about order, as the server sorted the
1385                  * entries before it did the second mmap of them */
1386                 for (i = 0; i < num_hp && offset < mcfg->memseg[s].len; i++){
1387                         if (hp[i].memseg_id == (int)s){
1388                                 fd = open(hp[i].filepath, O_RDWR);
1389                                 if (fd < 0) {
1390                                         RTE_LOG(ERR, EAL, "Could not open %s\n",
1391                                                 hp[i].filepath);
1392                                         goto error;
1393                                 }
1394                                 mapping_size = hp[i].size;
1395                                 addr = mmap(RTE_PTR_ADD(base_addr, offset),
1396                                                 mapping_size, PROT_READ | PROT_WRITE,
1397                                                 MAP_SHARED, fd, 0);
1398                                 close(fd); /* close file both on success and on failure */
1399                                 if (addr == MAP_FAILED ||
1400                                                 addr != RTE_PTR_ADD(base_addr, offset)) {
1401                                         RTE_LOG(ERR, EAL, "Could not mmap %s\n",
1402                                                 hp[i].filepath);
1403                                         goto error;
1404                                 }
1405                                 offset+=mapping_size;
1406                         }
1407                 }
1408                 RTE_LOG(DEBUG, EAL, "Mapped segment %u of size 0x%llx\n", s,
1409                                 (unsigned long long)mcfg->memseg[s].len);
1410                 s++;
1411         }
1412         /* unmap the hugepage config file, since we are done using it */
1413         munmap(hp, size);
1414         close(fd_zero);
1415         close(fd_hugepage);
1416         return 0;
1417
1418 error:
1419         for (i = 0; i < max_seg && mcfg->memseg[i].len > 0; i++)
1420                 munmap(mcfg->memseg[i].addr, mcfg->memseg[i].len);
1421         if (hp != NULL && hp != MAP_FAILED)
1422                 munmap(hp, size);
1423         if (fd_zero >= 0)
1424                 close(fd_zero);
1425         if (fd_hugepage >= 0)
1426                 close(fd_hugepage);
1427         return -1;
1428 }