bump version to 15.2.11-pve1

[ceph.git] / ceph / src / spdk / dpdk / lib / librte_eal / linux / eal / eal_memory.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation.
 * Copyright(c) 2013 6WIND S.A.
 */

#define _FILE_OFFSET_BITS 64
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/file.h>
#include <sys/resource.h>
#include <unistd.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
#ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */
#include <linux/memfd.h>
#define MEMFD_SUPPORTED
#endif
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
#include <numa.h>
#include <numaif.h>
#endif

#include <rte_errno.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_eal_memconfig.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_common.h>
#include <rte_string_fns.h>

#include "eal_private.h"
#include "eal_memalloc.h"
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
#include "eal_hugepages.h"
#include "eal_options.h"

#define PFN_MASK_SIZE   8

/**
 * @file
 * Huge page mapping under linux
 *
 * To reserve a big contiguous amount of memory, we use the hugepage
 * feature of linux. For that, we need to have hugetlbfs mounted. This
 * code will create many files in this directory (one per page) and
 * map them in virtual memory. For each page, we will retrieve its
 * physical address and remap it in order to have a virtual contiguous
 * zone as well as a physical contiguous zone.
 */

static bool phys_addrs_available = true;

#define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"

static void
test_phys_addrs_available(void)
{
        uint64_t tmp = 0;
        phys_addr_t physaddr;

        if (!rte_eal_has_hugepages()) {
                RTE_LOG(ERR, EAL,
                        "Started without hugepages support, physical addresses not available\n");
                phys_addrs_available = false;
                return;
        }

        physaddr = rte_mem_virt2phy(&tmp);
        if (physaddr == RTE_BAD_PHYS_ADDR) {
                if (rte_eal_iova_mode() == RTE_IOVA_PA)
                        RTE_LOG(ERR, EAL,
                                "Cannot obtain physical addresses: %s. "
                                "Only vfio will function.\n",
                                strerror(errno));
                phys_addrs_available = false;
        }
}

/*
 * Get physical address of any mapped virtual address in the current process.
 */
phys_addr_t
rte_mem_virt2phy(const void *virtaddr)
{
        int fd, retval;
        uint64_t page, physaddr;
        unsigned long virt_pfn;
        int page_size;
        off_t offset;

        /* Cannot parse /proc/self/pagemap, no need to log errors everywhere */
        if (!phys_addrs_available)
                return RTE_BAD_IOVA;

        /* standard page size */
        page_size = getpagesize();

        fd = open("/proc/self/pagemap", O_RDONLY);
        if (fd < 0) {
                RTE_LOG(INFO, EAL, "%s(): cannot open /proc/self/pagemap: %s\n",
                        __func__, strerror(errno));
                return RTE_BAD_IOVA;
        }

        virt_pfn = (unsigned long)virtaddr / page_size;
        offset = sizeof(uint64_t) * virt_pfn;
        if (lseek(fd, offset, SEEK_SET) == (off_t) -1) {
                RTE_LOG(INFO, EAL, "%s(): seek error in /proc/self/pagemap: %s\n",
                                __func__, strerror(errno));
                close(fd);
                return RTE_BAD_IOVA;
        }

        retval = read(fd, &page, PFN_MASK_SIZE);
        close(fd);
        if (retval < 0) {
                RTE_LOG(INFO, EAL, "%s(): cannot read /proc/self/pagemap: %s\n",
                                __func__, strerror(errno));
                return RTE_BAD_IOVA;
        } else if (retval != PFN_MASK_SIZE) {
                RTE_LOG(INFO, EAL, "%s(): read %d bytes from /proc/self/pagemap "
                                "but expected %d:\n",
                                __func__, retval, PFN_MASK_SIZE);
                return RTE_BAD_IOVA;
        }

        /*
         * the pfn (page frame number) are bits 0-54 (see
         * pagemap.txt in linux Documentation)
         */
        if ((page & 0x7fffffffffffffULL) == 0)
                return RTE_BAD_IOVA;

        physaddr = ((page & 0x7fffffffffffffULL) * page_size)
                + ((unsigned long)virtaddr % page_size);

        return physaddr;
}

rte_iova_t
rte_mem_virt2iova(const void *virtaddr)
{
        if (rte_eal_iova_mode() == RTE_IOVA_VA)
                return (uintptr_t)virtaddr;
        return rte_mem_virt2phy(virtaddr);
}

/*
 * For each hugepage in hugepg_tbl, fill the physaddr value. We find
 * it by browsing the /proc/self/pagemap special file.
 */
static int
find_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
{
        unsigned int i;
        phys_addr_t addr;

        for (i = 0; i < hpi->num_pages[0]; i++) {
                addr = rte_mem_virt2phy(hugepg_tbl[i].orig_va);
                if (addr == RTE_BAD_PHYS_ADDR)
                        return -1;
                hugepg_tbl[i].physaddr = addr;
        }
        return 0;
}

/*
 * For each hugepage in hugepg_tbl, fill the physaddr value sequentially.
 */
static int
set_physaddrs(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
{
        unsigned int i;
        static phys_addr_t addr;

        for (i = 0; i < hpi->num_pages[0]; i++) {
                hugepg_tbl[i].physaddr = addr;
                addr += hugepg_tbl[i].size;
        }
        return 0;
}

/*
 * Check whether address-space layout randomization is enabled in
 * the kernel. This is important for multi-process as it can prevent
 * two processes mapping data to the same virtual address
 * Returns:
 *    0 - address space randomization disabled
 *    1/2 - address space randomization enabled
 *    negative error code on error
 */
static int
aslr_enabled(void)
{
        char c;
        int retval, fd = open(RANDOMIZE_VA_SPACE_FILE, O_RDONLY);
        if (fd < 0)
                return -errno;
        retval = read(fd, &c, 1);
        close(fd);
        if (retval < 0)
                return -errno;
        if (retval == 0)
                return -EIO;
        switch (c) {
                case '0' : return 0;
                case '1' : return 1;
                case '2' : return 2;
                default: return -EINVAL;
        }
}

static sigjmp_buf huge_jmpenv;

static void huge_sigbus_handler(int signo __rte_unused)
{
        siglongjmp(huge_jmpenv, 1);
}

/* Put setjmp into a wrap method to avoid compiling error. Any non-volatile,
 * non-static local variable in the stack frame calling sigsetjmp might be
 * clobbered by a call to longjmp.
 */
static int huge_wrap_sigsetjmp(void)
{
        return sigsetjmp(huge_jmpenv, 1);
}

#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
/* Callback for numa library. */
void numa_error(char *where)
{
        RTE_LOG(ERR, EAL, "%s failed: %s\n", where, strerror(errno));
}
#endif

/*
 * Mmap all hugepages of hugepage table: it first open a file in
 * hugetlbfs, then mmap() hugepage_sz data in it. If orig is set, the
 * virtual address is stored in hugepg_tbl[i].orig_va, else it is stored
 * in hugepg_tbl[i].final_va. The second mapping (when orig is 0) tries to
 * map contiguous physical blocks in contiguous virtual blocks.
 */
static unsigned
map_all_hugepages(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi,
                  uint64_t *essential_memory __rte_unused)
{
        int fd;
        unsigned i;
        void *virtaddr;
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
        int node_id = -1;
        int essential_prev = 0;
        int oldpolicy;
        struct bitmask *oldmask = NULL;
        bool have_numa = true;
        unsigned long maxnode = 0;

        /* Check if kernel supports NUMA. */
        if (numa_available() != 0) {
                RTE_LOG(DEBUG, EAL, "NUMA is not supported.\n");
                have_numa = false;
        }

        if (have_numa) {
                RTE_LOG(DEBUG, EAL, "Trying to obtain current memory policy.\n");
                oldmask = numa_allocate_nodemask();
                if (get_mempolicy(&oldpolicy, oldmask->maskp,
                                  oldmask->size + 1, 0, 0) < 0) {
                        RTE_LOG(ERR, EAL,
                                "Failed to get current mempolicy: %s. "
                                "Assuming MPOL_DEFAULT.\n", strerror(errno));
                        oldpolicy = MPOL_DEFAULT;
                }
                for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
                        if (internal_config.socket_mem[i])
                                maxnode = i + 1;
        }
#endif

        for (i = 0; i < hpi->num_pages[0]; i++) {
                struct hugepage_file *hf = &hugepg_tbl[i];
                uint64_t hugepage_sz = hpi->hugepage_sz;

#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
                if (maxnode) {
                        unsigned int j;

                        for (j = 0; j < maxnode; j++)
                                if (essential_memory[j])
                                        break;

                        if (j == maxnode) {
                                node_id = (node_id + 1) % maxnode;
                                while (!internal_config.socket_mem[node_id]) {
                                        node_id++;
                                        node_id %= maxnode;
                                }
                                essential_prev = 0;
                        } else {
                                node_id = j;
                                essential_prev = essential_memory[j];

                                if (essential_memory[j] < hugepage_sz)
                                        essential_memory[j] = 0;
                                else
                                        essential_memory[j] -= hugepage_sz;
                        }

                        RTE_LOG(DEBUG, EAL,
                                "Setting policy MPOL_PREFERRED for socket %d\n",
                                node_id);
                        numa_set_preferred(node_id);
                }
#endif

                hf->file_id = i;
                hf->size = hugepage_sz;
                eal_get_hugefile_path(hf->filepath, sizeof(hf->filepath),
                                hpi->hugedir, hf->file_id);
                hf->filepath[sizeof(hf->filepath) - 1] = '\0';

                /* try to create hugepage file */
                fd = open(hf->filepath, O_CREAT | O_RDWR, 0600);
                if (fd < 0) {
                        RTE_LOG(DEBUG, EAL, "%s(): open failed: %s\n", __func__,
                                        strerror(errno));
                        goto out;
                }

                /* map the segment, and populate page tables,
                 * the kernel fills this segment with zeros. we don't care where
                 * this gets mapped - we already have contiguous memory areas
                 * ready for us to map into.
                 */
                virtaddr = mmap(NULL, hugepage_sz, PROT_READ | PROT_WRITE,
                                MAP_SHARED | MAP_POPULATE, fd, 0);
                if (virtaddr == MAP_FAILED) {
                        RTE_LOG(DEBUG, EAL, "%s(): mmap failed: %s\n", __func__,
                                        strerror(errno));
                        close(fd);
                        goto out;
                }

                hf->orig_va = virtaddr;

                /* In linux, hugetlb limitations, like cgroup, are
                 * enforced at fault time instead of mmap(), even
                 * with the option of MAP_POPULATE. Kernel will send
                 * a SIGBUS signal. To avoid to be killed, save stack
                 * environment here, if SIGBUS happens, we can jump
                 * back here.
                 */
                if (huge_wrap_sigsetjmp()) {
                        RTE_LOG(DEBUG, EAL, "SIGBUS: Cannot mmap more "
                                "hugepages of size %u MB\n",
                                (unsigned int)(hugepage_sz / 0x100000));
                        munmap(virtaddr, hugepage_sz);
                        close(fd);
                        unlink(hugepg_tbl[i].filepath);
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
                        if (maxnode)
                                essential_memory[node_id] =
                                        essential_prev;
#endif
                        goto out;
                }
                *(int *)virtaddr = 0;

                /* set shared lock on the file. */
                if (flock(fd, LOCK_SH) < 0) {
                        RTE_LOG(DEBUG, EAL, "%s(): Locking file failed:%s \n",
                                __func__, strerror(errno));
                        close(fd);
                        goto out;
                }

                close(fd);
        }

out:
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
        if (maxnode) {
                RTE_LOG(DEBUG, EAL,
                        "Restoring previous memory policy: %d\n", oldpolicy);
                if (oldpolicy == MPOL_DEFAULT) {
                        numa_set_localalloc();
                } else if (set_mempolicy(oldpolicy, oldmask->maskp,
                                         oldmask->size + 1) < 0) {
                        RTE_LOG(ERR, EAL, "Failed to restore mempolicy: %s\n",
                                strerror(errno));
                        numa_set_localalloc();
                }
        }
        if (oldmask != NULL)
                numa_free_cpumask(oldmask);
#endif
        return i;
}

/*
 * Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
 * page.
 */
static int
find_numasocket(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
{
        int socket_id;
        char *end, *nodestr;
        unsigned i, hp_count = 0;
        uint64_t virt_addr;
        char buf[BUFSIZ];
        char hugedir_str[PATH_MAX];
        FILE *f;

        f = fopen("/proc/self/numa_maps", "r");
        if (f == NULL) {
                RTE_LOG(NOTICE, EAL, "NUMA support not available"
                        " consider that all memory is in socket_id 0\n");
                return 0;
        }

        snprintf(hugedir_str, sizeof(hugedir_str),
                        "%s/%s", hpi->hugedir, eal_get_hugefile_prefix());

        /* parse numa map */
        while (fgets(buf, sizeof(buf), f) != NULL) {

                /* ignore non huge page */
                if (strstr(buf, " huge ") == NULL &&
                                strstr(buf, hugedir_str) == NULL)
                        continue;

                /* get zone addr */
                virt_addr = strtoull(buf, &end, 16);
                if (virt_addr == 0 || end == buf) {
                        RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
                        goto error;
                }

                /* get node id (socket id) */
                nodestr = strstr(buf, " N");
                if (nodestr == NULL) {
                        RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
                        goto error;
                }
                nodestr += 2;
                end = strstr(nodestr, "=");
                if (end == NULL) {
                        RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
                        goto error;
                }
                end[0] = '\0';
                end = NULL;

                socket_id = strtoul(nodestr, &end, 0);
                if ((nodestr[0] == '\0') || (end == NULL) || (*end != '\0')) {
                        RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
                        goto error;
                }

                /* if we find this page in our mappings, set socket_id */
                for (i = 0; i < hpi->num_pages[0]; i++) {
                        void *va = (void *)(unsigned long)virt_addr;
                        if (hugepg_tbl[i].orig_va == va) {
                                hugepg_tbl[i].socket_id = socket_id;
                                hp_count++;
#ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
                                RTE_LOG(DEBUG, EAL,
                                        "Hugepage %s is on socket %d\n",
                                        hugepg_tbl[i].filepath, socket_id);
#endif
                        }
                }
        }

        if (hp_count < hpi->num_pages[0])
                goto error;

        fclose(f);
        return 0;

error:
        fclose(f);
        return -1;
}

static int
cmp_physaddr(const void *a, const void *b)
{
#ifndef RTE_ARCH_PPC_64
        const struct hugepage_file *p1 = a;
        const struct hugepage_file *p2 = b;
#else
        /* PowerPC needs memory sorted in reverse order from x86 */
        const struct hugepage_file *p1 = b;
        const struct hugepage_file *p2 = a;
#endif
        if (p1->physaddr < p2->physaddr)
                return -1;
        else if (p1->physaddr > p2->physaddr)
                return 1;
        else
                return 0;
}

/*
 * Uses mmap to create a shared memory area for storage of data
 * Used in this file to store the hugepage file map on disk
 */
static void *
create_shared_memory(const char *filename, const size_t mem_size)
{
        void *retval;
        int fd;

        /* if no shared files mode is used, create anonymous memory instead */
        if (internal_config.no_shconf) {
                retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE,
                                MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
                if (retval == MAP_FAILED)
                        return NULL;
                return retval;
        }

        fd = open(filename, O_CREAT | O_RDWR, 0600);
        if (fd < 0)
                return NULL;
        if (ftruncate(fd, mem_size) < 0) {
                close(fd);
                return NULL;
        }
        retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
        close(fd);
        if (retval == MAP_FAILED)
                return NULL;
        return retval;
}

/*
 * this copies *active* hugepages from one hugepage table to another.
 * destination is typically the shared memory.
 */
static int
copy_hugepages_to_shared_mem(struct hugepage_file * dst, int dest_size,
                const struct hugepage_file * src, int src_size)
{
        int src_pos, dst_pos = 0;

        for (src_pos = 0; src_pos < src_size; src_pos++) {
                if (src[src_pos].orig_va != NULL) {
                        /* error on overflow attempt */
                        if (dst_pos == dest_size)
                                return -1;
                        memcpy(&dst[dst_pos], &src[src_pos], sizeof(struct hugepage_file));
                        dst_pos++;
                }
        }
        return 0;
}

static int
unlink_hugepage_files(struct hugepage_file *hugepg_tbl,
                unsigned num_hp_info)
{
        unsigned socket, size;
        int page, nrpages = 0;

        /* get total number of hugepages */
        for (size = 0; size < num_hp_info; size++)
                for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
                        nrpages +=
                        internal_config.hugepage_info[size].num_pages[socket];

        for (page = 0; page < nrpages; page++) {
                struct hugepage_file *hp = &hugepg_tbl[page];

                if (hp->orig_va != NULL && unlink(hp->filepath)) {
                        RTE_LOG(WARNING, EAL, "%s(): Removing %s failed: %s\n",
                                __func__, hp->filepath, strerror(errno));
                }
        }
        return 0;
}

/*
 * unmaps hugepages that are not going to be used. since we originally allocate
 * ALL hugepages (not just those we need), additional unmapping needs to be done.
 */
static int
unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
                struct hugepage_info *hpi,
                unsigned num_hp_info)
{
        unsigned socket, size;
        int page, nrpages = 0;

        /* get total number of hugepages */
        for (size = 0; size < num_hp_info; size++)
                for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
                        nrpages += internal_config.hugepage_info[size].num_pages[socket];

        for (size = 0; size < num_hp_info; size++) {
                for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
                        unsigned pages_found = 0;

                        /* traverse until we have unmapped all the unused pages */
                        for (page = 0; page < nrpages; page++) {
                                struct hugepage_file *hp = &hugepg_tbl[page];

                                /* find a page that matches the criteria */
                                if ((hp->size == hpi[size].hugepage_sz) &&
                                                (hp->socket_id == (int) socket)) {

                                        /* if we skipped enough pages, unmap the rest */
                                        if (pages_found == hpi[size].num_pages[socket]) {
                                                uint64_t unmap_len;

                                                unmap_len = hp->size;

                                                /* get start addr and len of the remaining segment */
                                                munmap(hp->orig_va,
                                                        (size_t)unmap_len);

                                                hp->orig_va = NULL;
                                                if (unlink(hp->filepath) == -1) {
                                                        RTE_LOG(ERR, EAL, "%s(): Removing %s failed: %s\n",
                                                                        __func__, hp->filepath, strerror(errno));
                                                        return -1;
                                                }
                                        } else {
                                                /* lock the page and skip */
                                                pages_found++;
                                        }

                                } /* match page */
                        } /* foreach page */
                } /* foreach socket */
        } /* foreach pagesize */

        return 0;
}

static int
remap_segment(struct hugepage_file *hugepages, int seg_start, int seg_end)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        struct rte_memseg_list *msl;
        struct rte_fbarray *arr;
        int cur_page, seg_len;
        unsigned int msl_idx;
        int ms_idx;
        uint64_t page_sz;
        size_t memseg_len;
        int socket_id;

        page_sz = hugepages[seg_start].size;
        socket_id = hugepages[seg_start].socket_id;
        seg_len = seg_end - seg_start;

        RTE_LOG(DEBUG, EAL, "Attempting to map %" PRIu64 "M on socket %i\n",
                        (seg_len * page_sz) >> 20ULL, socket_id);

        /* find free space in memseg lists */
        for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS; msl_idx++) {
                bool empty;
                msl = &mcfg->memsegs[msl_idx];
                arr = &msl->memseg_arr;

                if (msl->page_sz != page_sz)
                        continue;
                if (msl->socket_id != socket_id)
                        continue;

                /* leave space for a hole if array is not empty */
                empty = arr->count == 0;
                ms_idx = rte_fbarray_find_next_n_free(arr, 0,
                                seg_len + (empty ? 0 : 1));

                /* memseg list is full? */
                if (ms_idx < 0)
                        continue;

                /* leave some space between memsegs, they are not IOVA
                 * contiguous, so they shouldn't be VA contiguous either.
                 */
                if (!empty)
                        ms_idx++;
                break;
        }
        if (msl_idx == RTE_MAX_MEMSEG_LISTS) {
                RTE_LOG(ERR, EAL, "Could not find space for memseg. Please increase %s and/or %s in configuration.\n",
                                RTE_STR(CONFIG_RTE_MAX_MEMSEG_PER_TYPE),
                                RTE_STR(CONFIG_RTE_MAX_MEM_PER_TYPE));
                return -1;
        }

#ifdef RTE_ARCH_PPC64
        /* for PPC64 we go through the list backwards */
        for (cur_page = seg_end - 1; cur_page >= seg_start;
                        cur_page--, ms_idx++) {
#else
        for (cur_page = seg_start; cur_page < seg_end; cur_page++, ms_idx++) {
#endif
                struct hugepage_file *hfile = &hugepages[cur_page];
                struct rte_memseg *ms = rte_fbarray_get(arr, ms_idx);
                void *addr;
                int fd;

                fd = open(hfile->filepath, O_RDWR);
                if (fd < 0) {
                        RTE_LOG(ERR, EAL, "Could not open '%s': %s\n",
                                        hfile->filepath, strerror(errno));
                        return -1;
                }
                /* set shared lock on the file. */
                if (flock(fd, LOCK_SH) < 0) {
                        RTE_LOG(DEBUG, EAL, "Could not lock '%s': %s\n",
                                        hfile->filepath, strerror(errno));
                        close(fd);
                        return -1;
                }
                memseg_len = (size_t)page_sz;
                addr = RTE_PTR_ADD(msl->base_va, ms_idx * memseg_len);

                /* we know this address is already mmapped by memseg list, so
                 * using MAP_FIXED here is safe
                 */
                addr = mmap(addr, page_sz, PROT_READ | PROT_WRITE,
                                MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd, 0);
                if (addr == MAP_FAILED) {
                        RTE_LOG(ERR, EAL, "Couldn't remap '%s': %s\n",
                                        hfile->filepath, strerror(errno));
                        close(fd);
                        return -1;
                }

                /* we have a new address, so unmap previous one */
#ifndef RTE_ARCH_64
                /* in 32-bit legacy mode, we have already unmapped the page */
                if (!internal_config.legacy_mem)
                        munmap(hfile->orig_va, page_sz);
#else
                munmap(hfile->orig_va, page_sz);
#endif

                hfile->orig_va = NULL;
                hfile->final_va = addr;

                /* rewrite physical addresses in IOVA as VA mode */
                if (rte_eal_iova_mode() == RTE_IOVA_VA)
                        hfile->physaddr = (uintptr_t)addr;

                /* set up memseg data */
                ms->addr = addr;
                ms->hugepage_sz = page_sz;
                ms->len = memseg_len;
                ms->iova = hfile->physaddr;
                ms->socket_id = hfile->socket_id;
                ms->nchannel = rte_memory_get_nchannel();
                ms->nrank = rte_memory_get_nrank();

                rte_fbarray_set_used(arr, ms_idx);

                /* store segment fd internally */
                if (eal_memalloc_set_seg_fd(msl_idx, ms_idx, fd) < 0)
                        RTE_LOG(ERR, EAL, "Could not store segment fd: %s\n",
                                rte_strerror(rte_errno));
        }
        RTE_LOG(DEBUG, EAL, "Allocated %" PRIu64 "M on socket %i\n",
                        (seg_len * page_sz) >> 20, socket_id);
        return 0;
}

static uint64_t
get_mem_amount(uint64_t page_sz, uint64_t max_mem)
{
        uint64_t area_sz, max_pages;

        /* limit to RTE_MAX_MEMSEG_PER_LIST pages or RTE_MAX_MEM_MB_PER_LIST */
        max_pages = RTE_MAX_MEMSEG_PER_LIST;
        max_mem = RTE_MIN((uint64_t)RTE_MAX_MEM_MB_PER_LIST << 20, max_mem);

        area_sz = RTE_MIN(page_sz * max_pages, max_mem);

        /* make sure the list isn't smaller than the page size */
        area_sz = RTE_MAX(area_sz, page_sz);

        return RTE_ALIGN(area_sz, page_sz);
}

static int
free_memseg_list(struct rte_memseg_list *msl)
{
        if (rte_fbarray_destroy(&msl->memseg_arr)) {
                RTE_LOG(ERR, EAL, "Cannot destroy memseg list\n");
                return -1;
        }
        memset(msl, 0, sizeof(*msl));
        return 0;
}

#define MEMSEG_LIST_FMT "memseg-%" PRIu64 "k-%i-%i"
static int
alloc_memseg_list(struct rte_memseg_list *msl, uint64_t page_sz,
                int n_segs, int socket_id, int type_msl_idx)
{
        char name[RTE_FBARRAY_NAME_LEN];

        snprintf(name, sizeof(name), MEMSEG_LIST_FMT, page_sz >> 10, socket_id,
                 type_msl_idx);
        if (rte_fbarray_init(&msl->memseg_arr, name, n_segs,
                        sizeof(struct rte_memseg))) {
                RTE_LOG(ERR, EAL, "Cannot allocate memseg list: %s\n",
                        rte_strerror(rte_errno));
                return -1;
        }

        msl->page_sz = page_sz;
        msl->socket_id = socket_id;
        msl->base_va = NULL;

        RTE_LOG(DEBUG, EAL, "Memseg list allocated: 0x%zxkB at socket %i\n",
                        (size_t)page_sz >> 10, socket_id);

        return 0;
}

static int
alloc_va_space(struct rte_memseg_list *msl)
{
        uint64_t page_sz;
        size_t mem_sz;
        void *addr;
        int flags = 0;

        page_sz = msl->page_sz;
        mem_sz = page_sz * msl->memseg_arr.len;

        addr = eal_get_virtual_area(msl->base_va, &mem_sz, page_sz, 0, flags);
        if (addr == NULL) {
                if (rte_errno == EADDRNOTAVAIL)
                        RTE_LOG(ERR, EAL, "Could not mmap %llu bytes at [%p] - please use '--base-virtaddr' option\n",
                                (unsigned long long)mem_sz, msl->base_va);
                else
                        RTE_LOG(ERR, EAL, "Cannot reserve memory\n");
                return -1;
        }
        msl->base_va = addr;
        msl->len = mem_sz;

        return 0;
}

/*
 * Our VA space is not preallocated yet, so preallocate it here. We need to know
 * how many segments there are in order to map all pages into one address space,
 * and leave appropriate holes between segments so that rte_malloc does not
 * concatenate them into one big segment.
 *
 * we also need to unmap original pages to free up address space.
 */
static int __rte_unused
prealloc_segments(struct hugepage_file *hugepages, int n_pages)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        int cur_page, seg_start_page, end_seg, new_memseg;
        unsigned int hpi_idx, socket, i;
        int n_contig_segs, n_segs;
        int msl_idx;

        /* before we preallocate segments, we need to free up our VA space.
         * we're not removing files, and we already have information about
         * PA-contiguousness, so it is safe to unmap everything.
         */
        for (cur_page = 0; cur_page < n_pages; cur_page++) {
                struct hugepage_file *hpi = &hugepages[cur_page];
                munmap(hpi->orig_va, hpi->size);
                hpi->orig_va = NULL;
        }

        /* we cannot know how many page sizes and sockets we have discovered, so
         * loop over all of them
         */
        for (hpi_idx = 0; hpi_idx < internal_config.num_hugepage_sizes;
                        hpi_idx++) {
                uint64_t page_sz =
                        internal_config.hugepage_info[hpi_idx].hugepage_sz;

                for (i = 0; i < rte_socket_count(); i++) {
                        struct rte_memseg_list *msl;

                        socket = rte_socket_id_by_idx(i);
                        n_contig_segs = 0;
                        n_segs = 0;
                        seg_start_page = -1;

                        for (cur_page = 0; cur_page < n_pages; cur_page++) {
                                struct hugepage_file *prev, *cur;
                                int prev_seg_start_page = -1;

                                cur = &hugepages[cur_page];
                                prev = cur_page == 0 ? NULL :
                                                &hugepages[cur_page - 1];

                                new_memseg = 0;
                                end_seg = 0;

                                if (cur->size == 0)
                                        end_seg = 1;
                                else if (cur->socket_id != (int) socket)
                                        end_seg = 1;
                                else if (cur->size != page_sz)
                                        end_seg = 1;
                                else if (cur_page == 0)
                                        new_memseg = 1;
#ifdef RTE_ARCH_PPC_64
                                /* On PPC64 architecture, the mmap always start
                                 * from higher address to lower address. Here,
                                 * physical addresses are in descending order.
                                 */
                                else if ((prev->physaddr - cur->physaddr) !=
                                                cur->size)
                                        new_memseg = 1;
#else
                                else if ((cur->physaddr - prev->physaddr) !=
                                                cur->size)
                                        new_memseg = 1;
#endif
                                if (new_memseg) {
                                        /* if we're already inside a segment,
                                         * new segment means end of current one
                                         */
                                        if (seg_start_page != -1) {
                                                end_seg = 1;
                                                prev_seg_start_page =
                                                                seg_start_page;
                                        }
                                        seg_start_page = cur_page;
                                }

                                if (end_seg) {
                                        if (prev_seg_start_page != -1) {
                                                /* we've found a new segment */
                                                n_contig_segs++;
                                                n_segs += cur_page -
                                                        prev_seg_start_page;
                                        } else if (seg_start_page != -1) {
                                                /* we didn't find new segment,
                                                 * but did end current one
                                                 */
                                                n_contig_segs++;
                                                n_segs += cur_page -
                                                                seg_start_page;
                                                seg_start_page = -1;
                                                continue;
                                        } else {
                                                /* we're skipping this page */
                                                continue;
                                        }
                                }
                                /* segment continues */
                        }
                        /* check if we missed last segment */
                        if (seg_start_page != -1) {
                                n_contig_segs++;
                                n_segs += cur_page - seg_start_page;
                        }

                        /* if no segments were found, do not preallocate */
                        if (n_segs == 0)
                                continue;

                        /* we now have total number of pages that we will
                         * allocate for this segment list. add separator pages
                         * to the total count, and preallocate VA space.
                         */
                        n_segs += n_contig_segs - 1;

                        /* now, preallocate VA space for these segments */

                        /* first, find suitable memseg list for this */
                        for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS;
                                        msl_idx++) {
                                msl = &mcfg->memsegs[msl_idx];

                                if (msl->base_va != NULL)
                                        continue;
                                break;
                        }
                        if (msl_idx == RTE_MAX_MEMSEG_LISTS) {
                                RTE_LOG(ERR, EAL, "Not enough space in memseg lists, please increase %s\n",
                                        RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
                                return -1;
                        }

                        /* now, allocate fbarray itself */
                        if (alloc_memseg_list(msl, page_sz, n_segs, socket,
                                                msl_idx) < 0)
                                return -1;

                        /* finally, allocate VA space */
                        if (alloc_va_space(msl) < 0)
                                return -1;
                }
        }
        return 0;
}

/*
 * We cannot reallocate memseg lists on the fly because PPC64 stores pages
 * backwards, therefore we have to process the entire memseg first before
 * remapping it into memseg list VA space.
 */
static int
remap_needed_hugepages(struct hugepage_file *hugepages, int n_pages)
{
        int cur_page, seg_start_page, new_memseg, ret;

        seg_start_page = 0;
        for (cur_page = 0; cur_page < n_pages; cur_page++) {
                struct hugepage_file *prev, *cur;

                new_memseg = 0;

                cur = &hugepages[cur_page];
                prev = cur_page == 0 ? NULL : &hugepages[cur_page - 1];

                /* if size is zero, no more pages left */
                if (cur->size == 0)
                        break;

                if (cur_page == 0)
                        new_memseg = 1;
                else if (cur->socket_id != prev->socket_id)
                        new_memseg = 1;
                else if (cur->size != prev->size)
                        new_memseg = 1;
#ifdef RTE_ARCH_PPC_64
                /* On PPC64 architecture, the mmap always start from higher
                 * address to lower address. Here, physical addresses are in
                 * descending order.
                 */
                else if ((prev->physaddr - cur->physaddr) != cur->size)
                        new_memseg = 1;
#else
                else if ((cur->physaddr - prev->physaddr) != cur->size)
                        new_memseg = 1;
#endif

                if (new_memseg) {
                        /* if this isn't the first time, remap segment */
                        if (cur_page != 0) {
                                ret = remap_segment(hugepages, seg_start_page,
                                                cur_page);
                                if (ret != 0)
                                        return -1;
                        }
                        /* remember where we started */
                        seg_start_page = cur_page;
                }
                /* continuation of previous memseg */
        }
        /* we were stopped, but we didn't remap the last segment, do it now */
        if (cur_page != 0) {
                ret = remap_segment(hugepages, seg_start_page,
                                cur_page);
                if (ret != 0)
                        return -1;
        }
        return 0;
}

static inline uint64_t
get_socket_mem_size(int socket)
{
        uint64_t size = 0;
        unsigned i;

        for (i = 0; i < internal_config.num_hugepage_sizes; i++){
                struct hugepage_info *hpi = &internal_config.hugepage_info[i];
                size += hpi->hugepage_sz * hpi->num_pages[socket];
        }

        return size;
}

/*
 * This function is a NUMA-aware equivalent of calc_num_pages.
 * It takes in the list of hugepage sizes and the
 * number of pages thereof, and calculates the best number of
 * pages of each size to fulfill the request for <memory> ram
 */
static int
calc_num_pages_per_socket(uint64_t * memory,
                struct hugepage_info *hp_info,
                struct hugepage_info *hp_used,
                unsigned num_hp_info)
{
        unsigned socket, j, i = 0;
        unsigned requested, available;
        int total_num_pages = 0;
        uint64_t remaining_mem, cur_mem;
        uint64_t total_mem = internal_config.memory;

        if (num_hp_info == 0)
                return -1;

        /* if specific memory amounts per socket weren't requested */
        if (internal_config.force_sockets == 0) {
                size_t total_size;
#ifdef RTE_ARCH_64
                int cpu_per_socket[RTE_MAX_NUMA_NODES];
                size_t default_size;
                unsigned lcore_id;

                /* Compute number of cores per socket */
                memset(cpu_per_socket, 0, sizeof(cpu_per_socket));
                RTE_LCORE_FOREACH(lcore_id) {
                        cpu_per_socket[rte_lcore_to_socket_id(lcore_id)]++;
                }

                /*
                 * Automatically spread requested memory amongst detected sockets according
                 * to number of cores from cpu mask present on each socket
                 */
                total_size = internal_config.memory;
                for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_size != 0; socket++) {

                        /* Set memory amount per socket */
                        default_size = (internal_config.memory * cpu_per_socket[socket])
                                        / rte_lcore_count();

                        /* Limit to maximum available memory on socket */
                        default_size = RTE_MIN(default_size, get_socket_mem_size(socket));

                        /* Update sizes */
                        memory[socket] = default_size;
                        total_size -= default_size;
                }

                /*
                 * If some memory is remaining, try to allocate it by getting all
                 * available memory from sockets, one after the other
                 */
                for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_size != 0; socket++) {
                        /* take whatever is available */
                        default_size = RTE_MIN(get_socket_mem_size(socket) - memory[socket],
                                               total_size);

                        /* Update sizes */
                        memory[socket] += default_size;
                        total_size -= default_size;
                }
#else
                /* in 32-bit mode, allocate all of the memory only on master
                 * lcore socket
                 */
                total_size = internal_config.memory;
                for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_size != 0;
                                socket++) {
                        struct rte_config *cfg = rte_eal_get_configuration();
                        unsigned int master_lcore_socket;

                        master_lcore_socket =
                                rte_lcore_to_socket_id(cfg->master_lcore);

                        if (master_lcore_socket != socket)
                                continue;

                        /* Update sizes */
                        memory[socket] = total_size;
                        break;
                }
#endif
        }

        for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_mem != 0; socket++) {
                /* skips if the memory on specific socket wasn't requested */
                for (i = 0; i < num_hp_info && memory[socket] != 0; i++){
                        strlcpy(hp_used[i].hugedir, hp_info[i].hugedir,
                                sizeof(hp_used[i].hugedir));
                        hp_used[i].num_pages[socket] = RTE_MIN(
                                        memory[socket] / hp_info[i].hugepage_sz,
                                        hp_info[i].num_pages[socket]);

                        cur_mem = hp_used[i].num_pages[socket] *
                                        hp_used[i].hugepage_sz;

                        memory[socket] -= cur_mem;
                        total_mem -= cur_mem;

                        total_num_pages += hp_used[i].num_pages[socket];

                        /* check if we have met all memory requests */
                        if (memory[socket] == 0)
                                break;

                        /* check if we have any more pages left at this size, if so
                         * move on to next size */
                        if (hp_used[i].num_pages[socket] == hp_info[i].num_pages[socket])
                                continue;
                        /* At this point we know that there are more pages available that are
                         * bigger than the memory we want, so lets see if we can get enough
                         * from other page sizes.
                         */
                        remaining_mem = 0;
                        for (j = i+1; j < num_hp_info; j++)
                                remaining_mem += hp_info[j].hugepage_sz *
                                hp_info[j].num_pages[socket];

                        /* is there enough other memory, if not allocate another page and quit */
                        if (remaining_mem < memory[socket]){
                                cur_mem = RTE_MIN(memory[socket],
                                                hp_info[i].hugepage_sz);
                                memory[socket] -= cur_mem;
                                total_mem -= cur_mem;
                                hp_used[i].num_pages[socket]++;
                                total_num_pages++;
                                break; /* we are done with this socket*/
                        }
                }
                /* if we didn't satisfy all memory requirements per socket */
                if (memory[socket] > 0 &&
                                internal_config.socket_mem[socket] != 0) {
                        /* to prevent icc errors */
                        requested = (unsigned) (internal_config.socket_mem[socket] /
                                        0x100000);
                        available = requested -
                                        ((unsigned) (memory[socket] / 0x100000));
                        RTE_LOG(ERR, EAL, "Not enough memory available on socket %u! "
                                        "Requested: %uMB, available: %uMB\n", socket,
                                        requested, available);
                        return -1;
                }
        }

        /* if we didn't satisfy total memory requirements */
        if (total_mem > 0) {
                requested = (unsigned) (internal_config.memory / 0x100000);
                available = requested - (unsigned) (total_mem / 0x100000);
                RTE_LOG(ERR, EAL, "Not enough memory available! Requested: %uMB,"
                                " available: %uMB\n", requested, available);
                return -1;
        }
        return total_num_pages;
}

static inline size_t
eal_get_hugepage_mem_size(void)
{
        uint64_t size = 0;
        unsigned i, j;

        for (i = 0; i < internal_config.num_hugepage_sizes; i++) {
                struct hugepage_info *hpi = &internal_config.hugepage_info[i];
                if (strnlen(hpi->hugedir, sizeof(hpi->hugedir)) != 0) {
                        for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
                                size += hpi->hugepage_sz * hpi->num_pages[j];
                        }
                }
        }

        return (size < SIZE_MAX) ? (size_t)(size) : SIZE_MAX;
}

static struct sigaction huge_action_old;
static int huge_need_recover;

static void
huge_register_sigbus(void)
{
        sigset_t mask;
        struct sigaction action;

        sigemptyset(&mask);
        sigaddset(&mask, SIGBUS);
        action.sa_flags = 0;
        action.sa_mask = mask;
        action.sa_handler = huge_sigbus_handler;

        huge_need_recover = !sigaction(SIGBUS, &action, &huge_action_old);
}

static void
huge_recover_sigbus(void)
{
        if (huge_need_recover) {
                sigaction(SIGBUS, &huge_action_old, NULL);
                huge_need_recover = 0;
        }
}

/*
 * Prepare physical memory mapping: fill configuration structure with
 * these infos, return 0 on success.
 *  1. map N huge pages in separate files in hugetlbfs
 *  2. find associated physical addr
 *  3. find associated NUMA socket ID
 *  4. sort all huge pages by physical address
 *  5. remap these N huge pages in the correct order
 *  6. unmap the first mapping
 *  7. fill memsegs in configuration with contiguous zones
 */
static int
eal_legacy_hugepage_init(void)
{
        struct rte_mem_config *mcfg;
        struct hugepage_file *hugepage = NULL, *tmp_hp = NULL;
        struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
        struct rte_fbarray *arr;
        struct rte_memseg *ms;

        uint64_t memory[RTE_MAX_NUMA_NODES];

        unsigned hp_offset;
        int i, j;
        int nr_hugefiles, nr_hugepages = 0;
        void *addr;

        test_phys_addrs_available();

        memset(used_hp, 0, sizeof(used_hp));

        /* get pointer to global configuration */
        mcfg = rte_eal_get_configuration()->mem_config;

        /* hugetlbfs can be disabled */
        if (internal_config.no_hugetlbfs) {
                struct rte_memseg_list *msl;
                int n_segs, cur_seg, fd, flags;
#ifdef MEMFD_SUPPORTED
                int memfd;
#endif
                uint64_t page_sz;

                /* nohuge mode is legacy mode */
                internal_config.legacy_mem = 1;

                /* nohuge mode is single-file segments mode */
                internal_config.single_file_segments = 1;

                /* create a memseg list */
                msl = &mcfg->memsegs[0];

                page_sz = RTE_PGSIZE_4K;
                n_segs = internal_config.memory / page_sz;

                if (rte_fbarray_init(&msl->memseg_arr, "nohugemem", n_segs,
                                        sizeof(struct rte_memseg))) {
                        RTE_LOG(ERR, EAL, "Cannot allocate memseg list\n");
                        return -1;
                }

                /* set up parameters for anonymous mmap */
                fd = -1;
                flags = MAP_PRIVATE | MAP_ANONYMOUS;

#ifdef MEMFD_SUPPORTED
                /* create a memfd and store it in the segment fd table */
                memfd = memfd_create("nohuge", 0);
                if (memfd < 0) {
                        RTE_LOG(DEBUG, EAL, "Cannot create memfd: %s\n",
                                        strerror(errno));
                        RTE_LOG(DEBUG, EAL, "Falling back to anonymous map\n");
                } else {
                        /* we got an fd - now resize it */
                        if (ftruncate(memfd, internal_config.memory) < 0) {
                                RTE_LOG(ERR, EAL, "Cannot resize memfd: %s\n",
                                                strerror(errno));
                                RTE_LOG(ERR, EAL, "Falling back to anonymous map\n");
                                close(memfd);
                        } else {
                                /* creating memfd-backed file was successful.
                                 * we want changes to memfd to be visible to
                                 * other processes (such as vhost backend), so
                                 * map it as shared memory.
                                 */
                                RTE_LOG(DEBUG, EAL, "Using memfd for anonymous memory\n");
                                fd = memfd;
                                flags = MAP_SHARED;
                        }
                }
#endif
                addr = mmap(NULL, internal_config.memory, PROT_READ | PROT_WRITE,
                                flags, fd, 0);
                if (addr == MAP_FAILED) {
                        RTE_LOG(ERR, EAL, "%s: mmap() failed: %s\n", __func__,
                                        strerror(errno));
                        return -1;
                }
                msl->base_va = addr;
                msl->page_sz = page_sz;
                msl->socket_id = 0;
                msl->len = internal_config.memory;

                /* we're in single-file segments mode, so only the segment list
                 * fd needs to be set up.
                 */
                if (fd != -1) {
                        if (eal_memalloc_set_seg_list_fd(0, fd) < 0) {
                                RTE_LOG(ERR, EAL, "Cannot set up segment list fd\n");
                                /* not a serious error, proceed */
                        }
                }

                /* populate memsegs. each memseg is one page long */
                for (cur_seg = 0; cur_seg < n_segs; cur_seg++) {
                        arr = &msl->memseg_arr;

                        ms = rte_fbarray_get(arr, cur_seg);
                        if (rte_eal_iova_mode() == RTE_IOVA_VA)
                                ms->iova = (uintptr_t)addr;
                        else
                                ms->iova = RTE_BAD_IOVA;
                        ms->addr = addr;
                        ms->hugepage_sz = page_sz;
                        ms->socket_id = 0;
                        ms->len = page_sz;

                        rte_fbarray_set_used(arr, cur_seg);

                        addr = RTE_PTR_ADD(addr, (size_t)page_sz);
                }
                if (mcfg->dma_maskbits &&
                    rte_mem_check_dma_mask_thread_unsafe(mcfg->dma_maskbits)) {
                        RTE_LOG(ERR, EAL,
                                "%s(): couldn't allocate memory due to IOVA exceeding limits of current DMA mask.\n",
                                __func__);
                        if (rte_eal_iova_mode() == RTE_IOVA_VA &&
                            rte_eal_using_phys_addrs())
                                RTE_LOG(ERR, EAL,
                                        "%s(): Please try initializing EAL with --iova-mode=pa parameter.\n",
                                        __func__);
                        goto fail;
                }
                return 0;
        }

        /* calculate total number of hugepages available. at this point we haven't
         * yet started sorting them so they all are on socket 0 */
        for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
                /* meanwhile, also initialize used_hp hugepage sizes in used_hp */
                used_hp[i].hugepage_sz = internal_config.hugepage_info[i].hugepage_sz;

                nr_hugepages += internal_config.hugepage_info[i].num_pages[0];
        }

        /*
         * allocate a memory area for hugepage table.
         * this isn't shared memory yet. due to the fact that we need some
         * processing done on these pages, shared memory will be created
         * at a later stage.
         */
        tmp_hp = malloc(nr_hugepages * sizeof(struct hugepage_file));
        if (tmp_hp == NULL)
                goto fail;

        memset(tmp_hp, 0, nr_hugepages * sizeof(struct hugepage_file));

        hp_offset = 0; /* where we start the current page size entries */

        huge_register_sigbus();

        /* make a copy of socket_mem, needed for balanced allocation. */
        for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
                memory[i] = internal_config.socket_mem[i];

        /* map all hugepages and sort them */
        for (i = 0; i < (int)internal_config.num_hugepage_sizes; i ++){
                unsigned pages_old, pages_new;
                struct hugepage_info *hpi;

                /*
                 * we don't yet mark hugepages as used at this stage, so
                 * we just map all hugepages available to the system
                 * all hugepages are still located on socket 0
                 */
                hpi = &internal_config.hugepage_info[i];

                if (hpi->num_pages[0] == 0)
                        continue;

                /* map all hugepages available */
                pages_old = hpi->num_pages[0];
                pages_new = map_all_hugepages(&tmp_hp[hp_offset], hpi, memory);
                if (pages_new < pages_old) {
                        RTE_LOG(DEBUG, EAL,
                                "%d not %d hugepages of size %u MB allocated\n",
                                pages_new, pages_old,
                                (unsigned)(hpi->hugepage_sz / 0x100000));

                        int pages = pages_old - pages_new;

                        nr_hugepages -= pages;
                        hpi->num_pages[0] = pages_new;
                        if (pages_new == 0)
                                continue;
                }

                if (phys_addrs_available &&
                                rte_eal_iova_mode() != RTE_IOVA_VA) {
                        /* find physical addresses for each hugepage */
                        if (find_physaddrs(&tmp_hp[hp_offset], hpi) < 0) {
                                RTE_LOG(DEBUG, EAL, "Failed to find phys addr "
                                        "for %u MB pages\n",
                                        (unsigned int)(hpi->hugepage_sz / 0x100000));
                                goto fail;
                        }
                } else {
                        /* set physical addresses for each hugepage */
                        if (set_physaddrs(&tmp_hp[hp_offset], hpi) < 0) {
                                RTE_LOG(DEBUG, EAL, "Failed to set phys addr "
                                        "for %u MB pages\n",
                                        (unsigned int)(hpi->hugepage_sz / 0x100000));
                                goto fail;
                        }
                }

                if (find_numasocket(&tmp_hp[hp_offset], hpi) < 0){
                        RTE_LOG(DEBUG, EAL, "Failed to find NUMA socket for %u MB pages\n",
                                        (unsigned)(hpi->hugepage_sz / 0x100000));
                        goto fail;
                }

                qsort(&tmp_hp[hp_offset], hpi->num_pages[0],
                      sizeof(struct hugepage_file), cmp_physaddr);

                /* we have processed a num of hugepages of this size, so inc offset */
                hp_offset += hpi->num_pages[0];
        }

        huge_recover_sigbus();

        if (internal_config.memory == 0 && internal_config.force_sockets == 0)
                internal_config.memory = eal_get_hugepage_mem_size();

        nr_hugefiles = nr_hugepages;


        /* clean out the numbers of pages */
        for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++)
                for (j = 0; j < RTE_MAX_NUMA_NODES; j++)
                        internal_config.hugepage_info[i].num_pages[j] = 0;

        /* get hugepages for each socket */
        for (i = 0; i < nr_hugefiles; i++) {
                int socket = tmp_hp[i].socket_id;

                /* find a hugepage info with right size and increment num_pages */
                const int nb_hpsizes = RTE_MIN(MAX_HUGEPAGE_SIZES,
                                (int)internal_config.num_hugepage_sizes);
                for (j = 0; j < nb_hpsizes; j++) {
                        if (tmp_hp[i].size ==
                                        internal_config.hugepage_info[j].hugepage_sz) {
                                internal_config.hugepage_info[j].num_pages[socket]++;
                        }
                }
        }

        /* make a copy of socket_mem, needed for number of pages calculation */
        for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
                memory[i] = internal_config.socket_mem[i];

        /* calculate final number of pages */
        nr_hugepages = calc_num_pages_per_socket(memory,
                        internal_config.hugepage_info, used_hp,
                        internal_config.num_hugepage_sizes);

        /* error if not enough memory available */
        if (nr_hugepages < 0)
                goto fail;

        /* reporting in! */
        for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
                for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
                        if (used_hp[i].num_pages[j] > 0) {
                                RTE_LOG(DEBUG, EAL,
                                        "Requesting %u pages of size %uMB"
                                        " from socket %i\n",
                                        used_hp[i].num_pages[j],
                                        (unsigned)
                                        (used_hp[i].hugepage_sz / 0x100000),
                                        j);
                        }
                }
        }

        /* create shared memory */
        hugepage = create_shared_memory(eal_hugepage_data_path(),
                        nr_hugefiles * sizeof(struct hugepage_file));

        if (hugepage == NULL) {
                RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
                goto fail;
        }
        memset(hugepage, 0, nr_hugefiles * sizeof(struct hugepage_file));

        /*
         * unmap pages that we won't need (looks at used_hp).
         * also, sets final_va to NULL on pages that were unmapped.
         */
        if (unmap_unneeded_hugepages(tmp_hp, used_hp,
                        internal_config.num_hugepage_sizes) < 0) {
                RTE_LOG(ERR, EAL, "Unmapping and locking hugepages failed!\n");
                goto fail;
        }

        /*
         * copy stuff from malloc'd hugepage* to the actual shared memory.
         * this procedure only copies those hugepages that have orig_va
         * not NULL. has overflow protection.
         */
        if (copy_hugepages_to_shared_mem(hugepage, nr_hugefiles,
                        tmp_hp, nr_hugefiles) < 0) {
                RTE_LOG(ERR, EAL, "Copying tables to shared memory failed!\n");
                goto fail;
        }

#ifndef RTE_ARCH_64
        /* for legacy 32-bit mode, we did not preallocate VA space, so do it */
        if (internal_config.legacy_mem &&
                        prealloc_segments(hugepage, nr_hugefiles)) {
                RTE_LOG(ERR, EAL, "Could not preallocate VA space for hugepages\n");
                goto fail;
        }
#endif

        /* remap all pages we do need into memseg list VA space, so that those
         * pages become first-class citizens in DPDK memory subsystem
         */
        if (remap_needed_hugepages(hugepage, nr_hugefiles)) {
                RTE_LOG(ERR, EAL, "Couldn't remap hugepage files into memseg lists\n");
                goto fail;
        }

        /* free the hugepage backing files */
        if (internal_config.hugepage_unlink &&
                unlink_hugepage_files(tmp_hp, internal_config.num_hugepage_sizes) < 0) {
                RTE_LOG(ERR, EAL, "Unlinking hugepage files failed!\n");
                goto fail;
        }

        /* free the temporary hugepage table */
        free(tmp_hp);
        tmp_hp = NULL;

        munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));
        hugepage = NULL;

        /* we're not going to allocate more pages, so release VA space for
         * unused memseg lists
         */
        for (i = 0; i < RTE_MAX_MEMSEG_LISTS; i++) {
                struct rte_memseg_list *msl = &mcfg->memsegs[i];
                size_t mem_sz;

                /* skip inactive lists */
                if (msl->base_va == NULL)
                        continue;
                /* skip lists where there is at least one page allocated */
                if (msl->memseg_arr.count > 0)
                        continue;
                /* this is an unused list, deallocate it */
                mem_sz = msl->len;
                munmap(msl->base_va, mem_sz);
                msl->base_va = NULL;

                /* destroy backing fbarray */
                rte_fbarray_destroy(&msl->memseg_arr);
        }

        if (mcfg->dma_maskbits &&
            rte_mem_check_dma_mask_thread_unsafe(mcfg->dma_maskbits)) {
                RTE_LOG(ERR, EAL,
                        "%s(): couldn't allocate memory due to IOVA exceeding limits of current DMA mask.\n",
                        __func__);
                goto fail;
        }

        return 0;

fail:
        huge_recover_sigbus();
        free(tmp_hp);
        if (hugepage != NULL)
                munmap(hugepage, nr_hugefiles * sizeof(struct hugepage_file));

        return -1;
}

static int __rte_unused
hugepage_count_walk(const struct rte_memseg_list *msl, void *arg)
{
        struct hugepage_info *hpi = arg;

        if (msl->page_sz != hpi->hugepage_sz)
                return 0;

        hpi->num_pages[msl->socket_id] += msl->memseg_arr.len;
        return 0;
}

static int
limits_callback(int socket_id, size_t cur_limit, size_t new_len)
{
        RTE_SET_USED(socket_id);
        RTE_SET_USED(cur_limit);
        RTE_SET_USED(new_len);
        return -1;
}

static int
eal_hugepage_init(void)
{
        struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
        uint64_t memory[RTE_MAX_NUMA_NODES];
        int hp_sz_idx, socket_id;

        test_phys_addrs_available();

        memset(used_hp, 0, sizeof(used_hp));

        for (hp_sz_idx = 0;
                        hp_sz_idx < (int) internal_config.num_hugepage_sizes;
                        hp_sz_idx++) {
#ifndef RTE_ARCH_64
                struct hugepage_info dummy;
                unsigned int i;
#endif
                /* also initialize used_hp hugepage sizes in used_hp */
                struct hugepage_info *hpi;
                hpi = &internal_config.hugepage_info[hp_sz_idx];
                used_hp[hp_sz_idx].hugepage_sz = hpi->hugepage_sz;

#ifndef RTE_ARCH_64
                /* for 32-bit, limit number of pages on socket to whatever we've
                 * preallocated, as we cannot allocate more.
                 */
                memset(&dummy, 0, sizeof(dummy));
                dummy.hugepage_sz = hpi->hugepage_sz;
                if (rte_memseg_list_walk(hugepage_count_walk, &dummy) < 0)
                        return -1;

                for (i = 0; i < RTE_DIM(dummy.num_pages); i++) {
                        hpi->num_pages[i] = RTE_MIN(hpi->num_pages[i],
                                        dummy.num_pages[i]);
                }
#endif
        }

        /* make a copy of socket_mem, needed for balanced allocation. */
        for (hp_sz_idx = 0; hp_sz_idx < RTE_MAX_NUMA_NODES; hp_sz_idx++)
                memory[hp_sz_idx] = internal_config.socket_mem[hp_sz_idx];

        /* calculate final number of pages */
        if (calc_num_pages_per_socket(memory,
                        internal_config.hugepage_info, used_hp,
                        internal_config.num_hugepage_sizes) < 0)
                return -1;

        for (hp_sz_idx = 0;
                        hp_sz_idx < (int)internal_config.num_hugepage_sizes;
                        hp_sz_idx++) {
                for (socket_id = 0; socket_id < RTE_MAX_NUMA_NODES;
                                socket_id++) {
                        struct rte_memseg **pages;
                        struct hugepage_info *hpi = &used_hp[hp_sz_idx];
                        unsigned int num_pages = hpi->num_pages[socket_id];
                        unsigned int num_pages_alloc;

                        if (num_pages == 0)
                                continue;

                        RTE_LOG(DEBUG, EAL, "Allocating %u pages of size %" PRIu64 "M on socket %i\n",
                                num_pages, hpi->hugepage_sz >> 20, socket_id);

                        /* we may not be able to allocate all pages in one go,
                         * because we break up our memory map into multiple
                         * memseg lists. therefore, try allocating multiple
                         * times and see if we can get the desired number of
                         * pages from multiple allocations.
                         */

                        num_pages_alloc = 0;
                        do {
                                int i, cur_pages, needed;

                                needed = num_pages - num_pages_alloc;

                                pages = malloc(sizeof(*pages) * needed);

                                /* do not request exact number of pages */
                                cur_pages = eal_memalloc_alloc_seg_bulk(pages,
                                                needed, hpi->hugepage_sz,
                                                socket_id, false);
                                if (cur_pages <= 0) {
                                        free(pages);
                                        return -1;
                                }

                                /* mark preallocated pages as unfreeable */
                                for (i = 0; i < cur_pages; i++) {
                                        struct rte_memseg *ms = pages[i];
                                        ms->flags |= RTE_MEMSEG_FLAG_DO_NOT_FREE;
                                }
                                free(pages);

                                num_pages_alloc += cur_pages;
                        } while (num_pages_alloc != num_pages);
                }
        }
        /* if socket limits were specified, set them */
        if (internal_config.force_socket_limits) {
                unsigned int i;
                for (i = 0; i < RTE_MAX_NUMA_NODES; i++) {
                        uint64_t limit = internal_config.socket_limit[i];
                        if (limit == 0)
                                continue;
                        if (rte_mem_alloc_validator_register("socket-limit",
                                        limits_callback, i, limit))
                                RTE_LOG(ERR, EAL, "Failed to register socket limits validator callback\n");
                }
        }
        return 0;
}

/*
 * uses fstat to report the size of a file on disk
 */
static off_t
getFileSize(int fd)
{
        struct stat st;
        if (fstat(fd, &st) < 0)
                return 0;
        return st.st_size;
}

/*
 * This creates the memory mappings in the secondary process to match that of
 * the server process. It goes through each memory segment in the DPDK runtime
 * configuration and finds the hugepages which form that segment, mapping them
 * in order to form a contiguous block in the virtual memory space
 */
static int
eal_legacy_hugepage_attach(void)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        struct hugepage_file *hp = NULL;
        unsigned int num_hp = 0;
        unsigned int i = 0;
        unsigned int cur_seg;
        off_t size = 0;
        int fd, fd_hugepage = -1;

        if (aslr_enabled() > 0) {
                RTE_LOG(WARNING, EAL, "WARNING: Address Space Layout Randomization "
                                "(ASLR) is enabled in the kernel.\n");
                RTE_LOG(WARNING, EAL, "   This may cause issues with mapping memory "
                                "into secondary processes\n");
        }

        test_phys_addrs_available();

        fd_hugepage = open(eal_hugepage_data_path(), O_RDONLY);
        if (fd_hugepage < 0) {
                RTE_LOG(ERR, EAL, "Could not open %s\n",
                                eal_hugepage_data_path());
                goto error;
        }

        size = getFileSize(fd_hugepage);
        hp = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd_hugepage, 0);
        if (hp == MAP_FAILED) {
                RTE_LOG(ERR, EAL, "Could not mmap %s\n",
                                eal_hugepage_data_path());
                goto error;
        }

        num_hp = size / sizeof(struct hugepage_file);
        RTE_LOG(DEBUG, EAL, "Analysing %u files\n", num_hp);

        /* map all segments into memory to make sure we get the addrs. the
         * segments themselves are already in memseg list (which is shared and
         * has its VA space already preallocated), so we just need to map
         * everything into correct addresses.
         */
        for (i = 0; i < num_hp; i++) {
                struct hugepage_file *hf = &hp[i];
                size_t map_sz = hf->size;
                void *map_addr = hf->final_va;
                int msl_idx, ms_idx;
                struct rte_memseg_list *msl;
                struct rte_memseg *ms;

                /* if size is zero, no more pages left */
                if (map_sz == 0)
                        break;

                fd = open(hf->filepath, O_RDWR);
                if (fd < 0) {
                        RTE_LOG(ERR, EAL, "Could not open %s: %s\n",
                                hf->filepath, strerror(errno));
                        goto error;
                }

                map_addr = mmap(map_addr, map_sz, PROT_READ | PROT_WRITE,
                                MAP_SHARED | MAP_FIXED, fd, 0);
                if (map_addr == MAP_FAILED) {
                        RTE_LOG(ERR, EAL, "Could not map %s: %s\n",
                                hf->filepath, strerror(errno));
                        goto fd_error;
                }

                /* set shared lock on the file. */
                if (flock(fd, LOCK_SH) < 0) {
                        RTE_LOG(DEBUG, EAL, "%s(): Locking file failed: %s\n",
                                __func__, strerror(errno));
                        goto fd_error;
                }

                /* find segment data */
                msl = rte_mem_virt2memseg_list(map_addr);
                if (msl == NULL) {
                        RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg list\n",
                                __func__);
                        goto fd_error;
                }
                ms = rte_mem_virt2memseg(map_addr, msl);
                if (ms == NULL) {
                        RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg\n",
                                __func__);
                        goto fd_error;
                }

                msl_idx = msl - mcfg->memsegs;
                ms_idx = rte_fbarray_find_idx(&msl->memseg_arr, ms);
                if (ms_idx < 0) {
                        RTE_LOG(DEBUG, EAL, "%s(): Cannot find memseg idx\n",
                                __func__);
                        goto fd_error;
                }

                /* store segment fd internally */
                if (eal_memalloc_set_seg_fd(msl_idx, ms_idx, fd) < 0)
                        RTE_LOG(ERR, EAL, "Could not store segment fd: %s\n",
                                rte_strerror(rte_errno));
        }
        /* unmap the hugepage config file, since we are done using it */
        munmap(hp, size);
        close(fd_hugepage);
        return 0;

fd_error:
        close(fd);
error:
        /* map all segments into memory to make sure we get the addrs */
        cur_seg = 0;
        for (cur_seg = 0; cur_seg < i; cur_seg++) {
                struct hugepage_file *hf = &hp[i];
                size_t map_sz = hf->size;
                void *map_addr = hf->final_va;

                munmap(map_addr, map_sz);
        }
        if (hp != NULL && hp != MAP_FAILED)
                munmap(hp, size);
        if (fd_hugepage >= 0)
                close(fd_hugepage);
        return -1;
}

static int
eal_hugepage_attach(void)
{
        if (eal_memalloc_sync_with_primary()) {
                RTE_LOG(ERR, EAL, "Could not map memory from primary process\n");
                if (aslr_enabled() > 0)
                        RTE_LOG(ERR, EAL, "It is recommended to disable ASLR in the kernel and retry running both primary and secondary processes\n");
                return -1;
        }
        return 0;
}

int
rte_eal_hugepage_init(void)
{
        return internal_config.legacy_mem ?
                        eal_legacy_hugepage_init() :
                        eal_hugepage_init();
}

int
rte_eal_hugepage_attach(void)
{
        return internal_config.legacy_mem ?
                        eal_legacy_hugepage_attach() :
                        eal_hugepage_attach();
}

int
rte_eal_using_phys_addrs(void)
{
        return phys_addrs_available;
}

static int __rte_unused
memseg_primary_init_32(void)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        int active_sockets, hpi_idx, msl_idx = 0;
        unsigned int socket_id, i;
        struct rte_memseg_list *msl;
        uint64_t extra_mem_per_socket, total_extra_mem, total_requested_mem;
        uint64_t max_mem;

        /* no-huge does not need this at all */
        if (internal_config.no_hugetlbfs)
                return 0;

        /* this is a giant hack, but desperate times call for desperate
         * measures. in legacy 32-bit mode, we cannot preallocate VA space,
         * because having upwards of 2 gigabytes of VA space already mapped will
         * interfere with our ability to map and sort hugepages.
         *
         * therefore, in legacy 32-bit mode, we will be initializing memseg
         * lists much later - in eal_memory.c, right after we unmap all the
         * unneeded pages. this will not affect secondary processes, as those
         * should be able to mmap the space without (too many) problems.
         */
        if (internal_config.legacy_mem)
                return 0;

        /* 32-bit mode is a very special case. we cannot know in advance where
         * the user will want to allocate their memory, so we have to do some
         * heuristics.
         */
        active_sockets = 0;
        total_requested_mem = 0;
        if (internal_config.force_sockets)
                for (i = 0; i < rte_socket_count(); i++) {
                        uint64_t mem;

                        socket_id = rte_socket_id_by_idx(i);
                        mem = internal_config.socket_mem[socket_id];

                        if (mem == 0)
                                continue;

                        active_sockets++;
                        total_requested_mem += mem;
                }
        else
                total_requested_mem = internal_config.memory;

        max_mem = (uint64_t)RTE_MAX_MEM_MB << 20;
        if (total_requested_mem > max_mem) {
                RTE_LOG(ERR, EAL, "Invalid parameters: 32-bit process can at most use %uM of memory\n",
                                (unsigned int)(max_mem >> 20));
                return -1;
        }
        total_extra_mem = max_mem - total_requested_mem;
        extra_mem_per_socket = active_sockets == 0 ? total_extra_mem :
                        total_extra_mem / active_sockets;

        /* the allocation logic is a little bit convoluted, but here's how it
         * works, in a nutshell:
         *  - if user hasn't specified on which sockets to allocate memory via
         *    --socket-mem, we allocate all of our memory on master core socket.
         *  - if user has specified sockets to allocate memory on, there may be
         *    some "unused" memory left (e.g. if user has specified --socket-mem
         *    such that not all memory adds up to 2 gigabytes), so add it to all
         *    sockets that are in use equally.
         *
         * page sizes are sorted by size in descending order, so we can safely
         * assume that we dispense with bigger page sizes first.
         */

        /* create memseg lists */
        for (i = 0; i < rte_socket_count(); i++) {
                int hp_sizes = (int) internal_config.num_hugepage_sizes;
                uint64_t max_socket_mem, cur_socket_mem;
                unsigned int master_lcore_socket;
                struct rte_config *cfg = rte_eal_get_configuration();
                bool skip;

                socket_id = rte_socket_id_by_idx(i);

#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
                /* we can still sort pages by socket in legacy mode */
                if (!internal_config.legacy_mem && socket_id > 0)
                        break;
#endif

                /* if we didn't specifically request memory on this socket */
                skip = active_sockets != 0 &&
                                internal_config.socket_mem[socket_id] == 0;
                /* ...or if we didn't specifically request memory on *any*
                 * socket, and this is not master lcore
                 */
                master_lcore_socket = rte_lcore_to_socket_id(cfg->master_lcore);
                skip |= active_sockets == 0 && socket_id != master_lcore_socket;

                if (skip) {
                        RTE_LOG(DEBUG, EAL, "Will not preallocate memory on socket %u\n",
                                        socket_id);
                        continue;
                }

                /* max amount of memory on this socket */
                max_socket_mem = (active_sockets != 0 ?
                                        internal_config.socket_mem[socket_id] :
                                        internal_config.memory) +
                                        extra_mem_per_socket;
                cur_socket_mem = 0;

                for (hpi_idx = 0; hpi_idx < hp_sizes; hpi_idx++) {
                        uint64_t max_pagesz_mem, cur_pagesz_mem = 0;
                        uint64_t hugepage_sz;
                        struct hugepage_info *hpi;
                        int type_msl_idx, max_segs, total_segs = 0;

                        hpi = &internal_config.hugepage_info[hpi_idx];
                        hugepage_sz = hpi->hugepage_sz;

                        /* check if pages are actually available */
                        if (hpi->num_pages[socket_id] == 0)
                                continue;

                        max_segs = RTE_MAX_MEMSEG_PER_TYPE;
                        max_pagesz_mem = max_socket_mem - cur_socket_mem;

                        /* make it multiple of page size */
                        max_pagesz_mem = RTE_ALIGN_FLOOR(max_pagesz_mem,
                                        hugepage_sz);

                        RTE_LOG(DEBUG, EAL, "Attempting to preallocate "
                                        "%" PRIu64 "M on socket %i\n",
                                        max_pagesz_mem >> 20, socket_id);

                        type_msl_idx = 0;
                        while (cur_pagesz_mem < max_pagesz_mem &&
                                        total_segs < max_segs) {
                                uint64_t cur_mem;
                                unsigned int n_segs;

                                if (msl_idx >= RTE_MAX_MEMSEG_LISTS) {
                                        RTE_LOG(ERR, EAL,
                                                "No more space in memseg lists, please increase %s\n",
                                                RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
                                        return -1;
                                }

                                msl = &mcfg->memsegs[msl_idx];

                                cur_mem = get_mem_amount(hugepage_sz,
                                                max_pagesz_mem);
                                n_segs = cur_mem / hugepage_sz;

                                if (alloc_memseg_list(msl, hugepage_sz, n_segs,
                                                socket_id, type_msl_idx)) {
                                        /* failing to allocate a memseg list is
                                         * a serious error.
                                         */
                                        RTE_LOG(ERR, EAL, "Cannot allocate memseg list\n");
                                        return -1;
                                }

                                if (alloc_va_space(msl)) {
                                        /* if we couldn't allocate VA space, we
                                         * can try with smaller page sizes.
                                         */
                                        RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list, retrying with different page size\n");
                                        /* deallocate memseg list */
                                        if (free_memseg_list(msl))
                                                return -1;
                                        break;
                                }

                                total_segs += msl->memseg_arr.len;
                                cur_pagesz_mem = total_segs * hugepage_sz;
                                type_msl_idx++;
                                msl_idx++;
                        }
                        cur_socket_mem += cur_pagesz_mem;
                }
                if (cur_socket_mem == 0) {
                        RTE_LOG(ERR, EAL, "Cannot allocate VA space on socket %u\n",
                                socket_id);
                        return -1;
                }
        }

        return 0;
}

static int __rte_unused
memseg_primary_init(void)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        struct memtype {
                uint64_t page_sz;
                int socket_id;
        } *memtypes = NULL;
        int i, hpi_idx, msl_idx, ret = -1; /* fail unless told to succeed */
        struct rte_memseg_list *msl;
        uint64_t max_mem, max_mem_per_type;
        unsigned int max_seglists_per_type;
        unsigned int n_memtypes, cur_type;

        /* no-huge does not need this at all */
        if (internal_config.no_hugetlbfs)
                return 0;

        /*
         * figuring out amount of memory we're going to have is a long and very
         * involved process. the basic element we're operating with is a memory
         * type, defined as a combination of NUMA node ID and page size (so that
         * e.g. 2 sockets with 2 page sizes yield 4 memory types in total).
         *
         * deciding amount of memory going towards each memory type is a
         * balancing act between maximum segments per type, maximum memory per
         * type, and number of detected NUMA nodes. the goal is to make sure
         * each memory type gets at least one memseg list.
         *
         * the total amount of memory is limited by RTE_MAX_MEM_MB value.
         *
         * the total amount of memory per type is limited by either
         * RTE_MAX_MEM_MB_PER_TYPE, or by RTE_MAX_MEM_MB divided by the number
         * of detected NUMA nodes. additionally, maximum number of segments per
         * type is also limited by RTE_MAX_MEMSEG_PER_TYPE. this is because for
         * smaller page sizes, it can take hundreds of thousands of segments to
         * reach the above specified per-type memory limits.
         *
         * additionally, each type may have multiple memseg lists associated
         * with it, each limited by either RTE_MAX_MEM_MB_PER_LIST for bigger
         * page sizes, or RTE_MAX_MEMSEG_PER_LIST segments for smaller ones.
         *
         * the number of memseg lists per type is decided based on the above
         * limits, and also taking number of detected NUMA nodes, to make sure
         * that we don't run out of memseg lists before we populate all NUMA
         * nodes with memory.
         *
         * we do this in three stages. first, we collect the number of types.
         * then, we figure out memory constraints and populate the list of
         * would-be memseg lists. then, we go ahead and allocate the memseg
         * lists.
         */

        /* create space for mem types */
        n_memtypes = internal_config.num_hugepage_sizes * rte_socket_count();
        memtypes = calloc(n_memtypes, sizeof(*memtypes));
        if (memtypes == NULL) {
                RTE_LOG(ERR, EAL, "Cannot allocate space for memory types\n");
                return -1;
        }

        /* populate mem types */
        cur_type = 0;
        for (hpi_idx = 0; hpi_idx < (int) internal_config.num_hugepage_sizes;
                        hpi_idx++) {
                struct hugepage_info *hpi;
                uint64_t hugepage_sz;

                hpi = &internal_config.hugepage_info[hpi_idx];
                hugepage_sz = hpi->hugepage_sz;

                for (i = 0; i < (int) rte_socket_count(); i++, cur_type++) {
                        int socket_id = rte_socket_id_by_idx(i);

#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
                        /* we can still sort pages by socket in legacy mode */
                        if (!internal_config.legacy_mem && socket_id > 0)
                                break;
#endif
                        memtypes[cur_type].page_sz = hugepage_sz;
                        memtypes[cur_type].socket_id = socket_id;

                        RTE_LOG(DEBUG, EAL, "Detected memory type: "
                                "socket_id:%u hugepage_sz:%" PRIu64 "\n",
                                socket_id, hugepage_sz);
                }
        }
        /* number of memtypes could have been lower due to no NUMA support */
        n_memtypes = cur_type;

        /* set up limits for types */
        max_mem = (uint64_t)RTE_MAX_MEM_MB << 20;
        max_mem_per_type = RTE_MIN((uint64_t)RTE_MAX_MEM_MB_PER_TYPE << 20,
                        max_mem / n_memtypes);
        /*
         * limit maximum number of segment lists per type to ensure there's
         * space for memseg lists for all NUMA nodes with all page sizes
         */
        max_seglists_per_type = RTE_MAX_MEMSEG_LISTS / n_memtypes;

        if (max_seglists_per_type == 0) {
                RTE_LOG(ERR, EAL, "Cannot accommodate all memory types, please increase %s\n",
                        RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
                goto out;
        }

        /* go through all mem types and create segment lists */
        msl_idx = 0;
        for (cur_type = 0; cur_type < n_memtypes; cur_type++) {
                unsigned int cur_seglist, n_seglists, n_segs;
                unsigned int max_segs_per_type, max_segs_per_list;
                struct memtype *type = &memtypes[cur_type];
                uint64_t max_mem_per_list, pagesz;
                int socket_id;

                pagesz = type->page_sz;
                socket_id = type->socket_id;

                /*
                 * we need to create segment lists for this type. we must take
                 * into account the following things:
                 *
                 * 1. total amount of memory we can use for this memory type
                 * 2. total amount of memory per memseg list allowed
                 * 3. number of segments needed to fit the amount of memory
                 * 4. number of segments allowed per type
                 * 5. number of segments allowed per memseg list
                 * 6. number of memseg lists we are allowed to take up
                 */

                /* calculate how much segments we will need in total */
                max_segs_per_type = max_mem_per_type / pagesz;
                /* limit number of segments to maximum allowed per type */
                max_segs_per_type = RTE_MIN(max_segs_per_type,
                                (unsigned int)RTE_MAX_MEMSEG_PER_TYPE);
                /* limit number of segments to maximum allowed per list */
                max_segs_per_list = RTE_MIN(max_segs_per_type,
                                (unsigned int)RTE_MAX_MEMSEG_PER_LIST);

                /* calculate how much memory we can have per segment list */
                max_mem_per_list = RTE_MIN(max_segs_per_list * pagesz,
                                (uint64_t)RTE_MAX_MEM_MB_PER_LIST << 20);

                /* calculate how many segments each segment list will have */
                n_segs = RTE_MIN(max_segs_per_list, max_mem_per_list / pagesz);

                /* calculate how many segment lists we can have */
                n_seglists = RTE_MIN(max_segs_per_type / n_segs,
                                max_mem_per_type / max_mem_per_list);

                /* limit number of segment lists according to our maximum */
                n_seglists = RTE_MIN(n_seglists, max_seglists_per_type);

                RTE_LOG(DEBUG, EAL, "Creating %i segment lists: "
                                "n_segs:%i socket_id:%i hugepage_sz:%" PRIu64 "\n",
                        n_seglists, n_segs, socket_id, pagesz);

                /* create all segment lists */
                for (cur_seglist = 0; cur_seglist < n_seglists; cur_seglist++) {
                        if (msl_idx >= RTE_MAX_MEMSEG_LISTS) {
                                RTE_LOG(ERR, EAL,
                                        "No more space in memseg lists, please increase %s\n",
                                        RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
                                goto out;
                        }
                        msl = &mcfg->memsegs[msl_idx++];

                        if (alloc_memseg_list(msl, pagesz, n_segs,
                                        socket_id, cur_seglist))
                                goto out;

                        if (alloc_va_space(msl)) {
                                RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list\n");
                                goto out;
                        }
                }
        }
        /* we're successful */
        ret = 0;
out:
        free(memtypes);
        return ret;
}

static int
memseg_secondary_init(void)
{
        struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
        int msl_idx = 0;
        struct rte_memseg_list *msl;

        for (msl_idx = 0; msl_idx < RTE_MAX_MEMSEG_LISTS; msl_idx++) {

                msl = &mcfg->memsegs[msl_idx];

                /* skip empty memseg lists */
                if (msl->memseg_arr.len == 0)
                        continue;

                if (rte_fbarray_attach(&msl->memseg_arr)) {
                        RTE_LOG(ERR, EAL, "Cannot attach to primary process memseg lists\n");
                        return -1;
                }

                /* preallocate VA space */
                if (alloc_va_space(msl)) {
                        RTE_LOG(ERR, EAL, "Cannot preallocate VA space for hugepage memory\n");
                        return -1;
                }
        }

        return 0;
}

int
rte_eal_memseg_init(void)
{
        /* increase rlimit to maximum */
        struct rlimit lim;

        if (getrlimit(RLIMIT_NOFILE, &lim) == 0) {
                /* set limit to maximum */
                lim.rlim_cur = lim.rlim_max;

                if (setrlimit(RLIMIT_NOFILE, &lim) < 0) {
                        RTE_LOG(DEBUG, EAL, "Setting maximum number of open files failed: %s\n",
                                        strerror(errno));
                } else {
                        RTE_LOG(DEBUG, EAL, "Setting maximum number of open files to %"
                                        PRIu64 "\n",
                                        (uint64_t)lim.rlim_cur);
                }
        } else {
                RTE_LOG(ERR, EAL, "Cannot get current resource limits\n");
        }
#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
        if (!internal_config.legacy_mem && rte_socket_count() > 1) {
                RTE_LOG(WARNING, EAL, "DPDK is running on a NUMA system, but is compiled without NUMA support.\n");
                RTE_LOG(WARNING, EAL, "This will have adverse consequences for performance and usability.\n");
                RTE_LOG(WARNING, EAL, "Please use --"OPT_LEGACY_MEM" option, or recompile with NUMA support.\n");
        }
#endif

        return rte_eal_process_type() == RTE_PROC_PRIMARY ?
#ifndef RTE_ARCH_64
                        memseg_primary_init_32() :
#else
                        memseg_primary_init() :
#endif
                        memseg_secondary_init();
}