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/* Copyright (c) 2013, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp_shared_memory.h>
#include <odp_internal.h>
#include <odp_spinlock.h>
#include <odp_align.h>
#include <odp_system_info.h>
#include <odp_debug.h>
#include <sys/mman.h>
#include <asm/mman.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#define ODP_SHM_NUM_BLOCKS 32
typedef struct {
char name[ODP_SHM_NAME_LEN];
uint64_t size;
uint64_t align;
void *addr_orig;
void *addr;
int huge;
} odp_shm_block_t;
typedef struct {
odp_shm_block_t block[ODP_SHM_NUM_BLOCKS];
odp_spinlock_t lock;
} odp_shm_table_t;
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#define SHM_FLAGS (MAP_SHARED | MAP_ANONYMOUS)
/* Global shared memory table */
static odp_shm_table_t *odp_shm_tbl;
int odp_shm_init_global(void)
{
void *addr;
#ifndef MAP_HUGETLB
ODP_DBG("NOTE: mmap does not support huge pages\n");
#endif
addr = mmap(NULL, sizeof(odp_shm_table_t),
PROT_READ | PROT_WRITE, SHM_FLAGS, -1, 0);
if (addr == MAP_FAILED)
return -1;
odp_shm_tbl = addr;
memset(odp_shm_tbl, 0, sizeof(odp_shm_table_t));
odp_spinlock_init(&odp_shm_tbl->lock);
return 0;
}
int odp_shm_init_local(void)
{
return 0;
}
static int find_block(const char *name)
{
int i;
for (i = 0; i < ODP_SHM_NUM_BLOCKS; i++) {
if (strcmp(name, odp_shm_tbl->block[i].name) == 0) {
/* found it */
return i;
}
}
return -1;
}
void *odp_shm_reserve(const char *name, uint64_t size, uint64_t align)
{
int i;
odp_shm_block_t *block;
void *addr;
#ifdef MAP_HUGETLB
uint64_t huge_sz, page_sz;
huge_sz = odp_sys_huge_page_size();
page_sz = odp_sys_page_size();
#endif
odp_spinlock_lock(&odp_shm_tbl->lock);
if (find_block(name) >= 0) {
/* Found a block with the same name */
odp_spinlock_unlock(&odp_shm_tbl->lock);
return NULL;
}
for (i = 0; i < ODP_SHM_NUM_BLOCKS; i++) {
if (odp_shm_tbl->block[i].addr == NULL) {
/* Found free block */
break;
}
}
if (i > ODP_SHM_NUM_BLOCKS - 1) {
/* Table full */
odp_spinlock_unlock(&odp_shm_tbl->lock);
return NULL;
}
block = &odp_shm_tbl->block[i];
addr = MAP_FAILED;
block->huge = 0;
#ifdef MAP_HUGETLB
/* Try first huge pages */
if (huge_sz && (size + align) > page_sz) {
addr = mmap(NULL, size + align, PROT_READ | PROT_WRITE,
SHM_FLAGS | MAP_HUGETLB, -1, 0);
}
#endif
/* Use normal pages for small or failed huge page allocations */
if (addr == MAP_FAILED) {
addr = mmap(NULL, size + align, PROT_READ | PROT_WRITE,
SHM_FLAGS, -1, 0);
} else {
block->huge = 1;
}
if (addr == MAP_FAILED) {
/* Alloc failed */
odp_spinlock_unlock(&odp_shm_tbl->lock);
return NULL;
}
block->addr_orig = addr;
/* move to correct alignment */
addr = ODP_ALIGN_ROUNDUP_PTR(addr, align);
strncpy(block->name, name, ODP_SHM_NAME_LEN - 1);
block->name[ODP_SHM_NAME_LEN - 1] = 0;
block->size = size;
block->align = align;
block->addr = addr;
odp_spinlock_unlock(&odp_shm_tbl->lock);
return addr;
}
void *odp_shm_lookup(const char *name)
{
int i;
void *addr;
odp_spinlock_lock(&odp_shm_tbl->lock);
i = find_block(name);
if (i < 0) {
odp_spinlock_unlock(&odp_shm_tbl->lock);
return NULL;
}
addr = odp_shm_tbl->block[i].addr;
odp_spinlock_unlock(&odp_shm_tbl->lock);
return addr;
}
void odp_shm_print_all(void)
{
int i;
printf("\nShared memory\n");
printf("--------------\n");
printf(" page size: %"PRIu64" kB\n", odp_sys_page_size() / 1024);
printf(" huge page size: %"PRIu64" kB\n",
odp_sys_huge_page_size() / 1024);
printf("\n");
printf(" id name kB align huge addr\n");
for (i = 0; i < ODP_SHM_NUM_BLOCKS; i++) {
odp_shm_block_t *block;
block = &odp_shm_tbl->block[i];
if (block->addr) {
printf(" %2i %-24s %4"PRIu64" %4"PRIu64" %2c %p\n",
i,
block->name,
block->size/1024,
block->align,
(block->huge ? '*' : ' '),
block->addr);
}
}
printf("\n");
}
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