lib/librte_eal/common/eal_common_memory.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdint.h>
   7 #include <stdlib.h>
   8 #include <stdarg.h>
   9 #include <unistd.h>
  10 #include <inttypes.h>
  11 #include <sys/mman.h>
  12 #include <sys/queue.h>
  13
  14 #include <rte_memory.h>
  15 #include <rte_eal.h>
  16 #include <rte_eal_memconfig.h>
  17 #include <rte_log.h>
  18
  19 #include "eal_private.h"
  20 #include "eal_internal_cfg.h"
  21
  22 /*
  23  * Return a pointer to a read-only table of struct rte_physmem_desc
  24  * elements, containing the layout of all addressable physical
  25  * memory. The last element of the table contains a NULL address.
  26  */
  27 const struct rte_memseg *
  28 rte_eal_get_physmem_layout(void)
  29 {
  30         return rte_eal_get_configuration()->mem_config->memseg;
  31 }
  32
  33
  34 /* get the total size of memory */
  35 uint64_t
  36 rte_eal_get_physmem_size(void)
  37 {
  38         const struct rte_mem_config *mcfg;
  39         unsigned i = 0;
  40         uint64_t total_len = 0;
  41
  42         /* get pointer to global configuration */
  43         mcfg = rte_eal_get_configuration()->mem_config;
  44
  45         for (i = 0; i < RTE_MAX_MEMSEG; i++) {
  46                 if (mcfg->memseg[i].addr == NULL)
  47                         break;
  48
  49                 total_len += mcfg->memseg[i].len;
  50         }
  51
  52         return total_len;
  53 }
  54
  55 /* Dump the physical memory layout on console */
  56 void
  57 rte_dump_physmem_layout(FILE *f)
  58 {
  59         const struct rte_mem_config *mcfg;
  60         unsigned i = 0;
  61
  62         /* get pointer to global configuration */
  63         mcfg = rte_eal_get_configuration()->mem_config;
  64
  65         for (i = 0; i < RTE_MAX_MEMSEG; i++) {
  66                 if (mcfg->memseg[i].addr == NULL)
  67                         break;
  68
  69                 fprintf(f, "Segment %u: IOVA:0x%"PRIx64", len:%zu, "
  70                        "virt:%p, socket_id:%"PRId32", "
  71                        "hugepage_sz:%"PRIu64", nchannel:%"PRIx32", "
  72                        "nrank:%"PRIx32"\n", i,
  73                        mcfg->memseg[i].iova,
  74                        mcfg->memseg[i].len,
  75                        mcfg->memseg[i].addr,
  76                        mcfg->memseg[i].socket_id,
  77                        mcfg->memseg[i].hugepage_sz,
  78                        mcfg->memseg[i].nchannel,
  79                        mcfg->memseg[i].nrank);
  80         }
  81 }
  82
  83 /* return the number of memory channels */
  84 unsigned rte_memory_get_nchannel(void)
  85 {
  86         return rte_eal_get_configuration()->mem_config->nchannel;
  87 }
  88
  89 /* return the number of memory rank */
  90 unsigned rte_memory_get_nrank(void)
  91 {
  92         return rte_eal_get_configuration()->mem_config->nrank;
  93 }
  94
  95 static int
  96 rte_eal_memdevice_init(void)
  97 {
  98         struct rte_config *config;
  99
 100         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 101                 return 0;
 102
 103         config = rte_eal_get_configuration();
 104         config->mem_config->nchannel = internal_config.force_nchannel;
 105         config->mem_config->nrank = internal_config.force_nrank;
 106
 107         return 0;
 108 }
 109
 110 /* Lock page in physical memory and prevent from swapping. */
 111 int
 112 rte_mem_lock_page(const void *virt)
 113 {
 114         unsigned long virtual = (unsigned long)virt;
 115         int page_size = getpagesize();
 116         unsigned long aligned = (virtual & ~(page_size - 1));
 117         return mlock((void *)aligned, page_size);
 118 }
 119
 120 /* init memory subsystem */
 121 int
 122 rte_eal_memory_init(void)
 123 {
 124         RTE_LOG(DEBUG, EAL, "Setting up physically contiguous memory...\n");
 125
 126         const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
 127                         rte_eal_hugepage_init() :
 128                         rte_eal_hugepage_attach();
 129         if (retval < 0)
 130                 return -1;
 131
 132         if (internal_config.no_shconf == 0 && rte_eal_memdevice_init() < 0)
 133                 return -1;
 134
 135         return 0;
 136 }