a083f8cc77
Since the kernel modules are moved to kernel/ directory, there is no need anymore for the sub-directory eal/ in linux/, freebsd/ and windows/. Signed-off-by: Thomas Monjalon <thomas@monjalon.net> Acked-by: David Marchand <david.marchand@redhat.com>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include <dirent.h>
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#include <rte_log.h>
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#include <rte_eal.h>
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#include <rte_lcore.h>
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#include <rte_common.h>
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#include <rte_string_fns.h>
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#include <rte_debug.h>
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#include "eal_private.h"
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#include "eal_filesystem.h"
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#include "eal_thread.h"
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#define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u"
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#define CORE_ID_FILE "topology/core_id"
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#define NUMA_NODE_PATH "/sys/devices/system/node"
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/* Check if a cpu is present by the presence of the cpu information for it */
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int
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eal_cpu_detected(unsigned lcore_id)
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{
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char path[PATH_MAX];
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int len = snprintf(path, sizeof(path), SYS_CPU_DIR
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"/"CORE_ID_FILE, lcore_id);
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if (len <= 0 || (unsigned)len >= sizeof(path))
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return 0;
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if (access(path, F_OK) != 0)
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return 0;
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return 1;
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}
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/*
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* Get CPU socket id (NUMA node) for a logical core.
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*
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* This searches each nodeX directories in /sys for the symlink for the given
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* lcore_id and returns the numa node where the lcore is found. If lcore is not
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* found on any numa node, returns zero.
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*/
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unsigned
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eal_cpu_socket_id(unsigned lcore_id)
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{
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unsigned socket;
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for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH,
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socket, lcore_id);
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if (access(path, F_OK) == 0)
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return socket;
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}
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return 0;
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}
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/* Get the cpu core id value from the /sys/.../cpuX core_id value */
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unsigned
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eal_cpu_core_id(unsigned lcore_id)
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{
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char path[PATH_MAX];
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unsigned long id;
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int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE);
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if (len <= 0 || (unsigned)len >= sizeof(path))
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goto err;
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if (eal_parse_sysfs_value(path, &id) != 0)
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goto err;
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return (unsigned)id;
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err:
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RTE_LOG(ERR, EAL, "Error reading core id value from %s "
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"for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id);
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return 0;
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}
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