1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
5 #include <sys/sysctl.h>
11 #include "eal_hugepages.h"
12 #include "eal_internal_cfg.h"
13 #include "eal_filesystem.h"
15 #define CONTIGMEM_DEV "/dev/contigmem"
18 * Uses mmap to create a shared memory area for storage of data
19 * Used in this file to store the hugepage file map on disk
22 create_shared_memory(const char *filename, const size_t mem_size)
25 int fd = open(filename, O_CREAT | O_RDWR, 0666);
28 if (ftruncate(fd, mem_size) < 0) {
32 retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
38 * No hugepage support on freebsd, but we dummy it, using contigmem driver
41 eal_hugepage_info_init(void)
44 int num_buffers, fd, error;
46 /* re-use the linux "internal config" structure for our memory data */
47 struct hugepage_info *hpi = &internal_config.hugepage_info[0];
48 struct hugepage_info *tmp_hpi;
50 sysctl_size = sizeof(num_buffers);
51 error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
52 &sysctl_size, NULL, 0);
55 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers");
59 sysctl_size = sizeof(buffer_size);
60 error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
61 &sysctl_size, NULL, 0);
64 RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size");
68 fd = open(CONTIGMEM_DEV, O_RDWR);
70 RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
74 if (buffer_size >= 1<<30)
75 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
76 num_buffers, (int)(buffer_size>>30));
77 else if (buffer_size >= 1<<20)
78 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
79 num_buffers, (int)(buffer_size>>20));
81 RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
82 num_buffers, (int)(buffer_size>>10));
84 internal_config.num_hugepage_sizes = 1;
85 hpi->hugedir = CONTIGMEM_DEV;
86 hpi->hugepage_sz = buffer_size;
87 hpi->num_pages[0] = num_buffers;
88 hpi->lock_descriptor = fd;
90 tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
91 sizeof(struct hugepage_info));
92 if (tmp_hpi == NULL ) {
93 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
97 memcpy(tmp_hpi, hpi, sizeof(struct hugepage_info));
99 if ( munmap(tmp_hpi, sizeof(struct hugepage_info)) < 0) {
100 RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");