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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <string.h>
#include <rte_log.h>
#include <fcntl.h>
#include "eal_hugepages.h"
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
#define CONTIGMEM_DEV "/dev/contigmem"
/*
* 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 = open(filename, O_CREAT | O_RDWR, 0666);
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);
return retval;
}
/*
* No hugepage support on freebsd, but we dummy it, using contigmem driver
*/
int
eal_hugepage_info_init(void)
{
size_t sysctl_size;
int num_buffers, fd, error;
int64_t buffer_size;
/* re-use the linux "internal config" structure for our memory data */
struct hugepage_info *hpi = &internal_config.hugepage_info[0];
struct hugepage_info *tmp_hpi;
sysctl_size = sizeof(num_buffers);
error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers,
&sysctl_size, NULL, 0);
if (error != 0) {
RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers");
return -1;
}
sysctl_size = sizeof(buffer_size);
error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size,
&sysctl_size, NULL, 0);
if (error != 0) {
RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size");
return -1;
}
fd = open(CONTIGMEM_DEV, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n");
return -1;
}
if (buffer_size >= 1<<30)
RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n",
num_buffers, (int)(buffer_size>>30));
else if (buffer_size >= 1<<20)
RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n",
num_buffers, (int)(buffer_size>>20));
else
RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n",
num_buffers, (int)(buffer_size>>10));
internal_config.num_hugepage_sizes = 1;
hpi->hugedir = CONTIGMEM_DEV;
hpi->hugepage_sz = buffer_size;
hpi->num_pages[0] = num_buffers;
hpi->lock_descriptor = fd;
tmp_hpi = create_shared_memory(eal_hugepage_info_path(),
sizeof(struct hugepage_info));
if (tmp_hpi == NULL ) {
RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
return -1;
}
memcpy(tmp_hpi, hpi, sizeof(struct hugepage_info));
if ( munmap(tmp_hpi, sizeof(struct hugepage_info)) < 0) {
RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n");
return -1;
}
return 0;
}
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