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1 | /* SPDX-License-Identifier: BSD-3-Clause |
2 | * Copyright(c) 2010-2014 Intel Corporation | |
7c673cae FG |
3 | */ |
4 | ||
5 | #include <unistd.h> | |
6 | #include <limits.h> | |
7 | #include <string.h> | |
8 | #include <dirent.h> | |
9 | ||
10 | #include <rte_log.h> | |
11 | #include <rte_eal.h> | |
12 | #include <rte_lcore.h> | |
13 | #include <rte_common.h> | |
14 | #include <rte_string_fns.h> | |
15 | #include <rte_debug.h> | |
16 | ||
17 | #include "eal_private.h" | |
18 | #include "eal_filesystem.h" | |
19 | #include "eal_thread.h" | |
20 | ||
21 | #define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u" | |
22 | #define CORE_ID_FILE "topology/core_id" | |
23 | #define NUMA_NODE_PATH "/sys/devices/system/node" | |
24 | ||
25 | /* Check if a cpu is present by the presence of the cpu information for it */ | |
26 | int | |
27 | eal_cpu_detected(unsigned lcore_id) | |
28 | { | |
29 | char path[PATH_MAX]; | |
30 | int len = snprintf(path, sizeof(path), SYS_CPU_DIR | |
31 | "/"CORE_ID_FILE, lcore_id); | |
32 | if (len <= 0 || (unsigned)len >= sizeof(path)) | |
33 | return 0; | |
34 | if (access(path, F_OK) != 0) | |
35 | return 0; | |
36 | ||
37 | return 1; | |
38 | } | |
39 | ||
40 | /* | |
41 | * Get CPU socket id (NUMA node) for a logical core. | |
42 | * | |
43 | * This searches each nodeX directories in /sys for the symlink for the given | |
44 | * lcore_id and returns the numa node where the lcore is found. If lcore is not | |
45 | * found on any numa node, returns zero. | |
46 | */ | |
47 | unsigned | |
48 | eal_cpu_socket_id(unsigned lcore_id) | |
49 | { | |
50 | unsigned socket; | |
51 | ||
52 | for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) { | |
53 | char path[PATH_MAX]; | |
54 | ||
55 | snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH, | |
56 | socket, lcore_id); | |
57 | if (access(path, F_OK) == 0) | |
58 | return socket; | |
59 | } | |
60 | return 0; | |
61 | } | |
62 | ||
63 | /* Get the cpu core id value from the /sys/.../cpuX core_id value */ | |
64 | unsigned | |
65 | eal_cpu_core_id(unsigned lcore_id) | |
66 | { | |
67 | char path[PATH_MAX]; | |
68 | unsigned long id; | |
69 | ||
70 | int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE); | |
71 | if (len <= 0 || (unsigned)len >= sizeof(path)) | |
72 | goto err; | |
73 | if (eal_parse_sysfs_value(path, &id) != 0) | |
74 | goto err; | |
75 | return (unsigned)id; | |
76 | ||
77 | err: | |
78 | RTE_LOG(ERR, EAL, "Error reading core id value from %s " | |
79 | "for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id); | |
80 | return 0; | |
81 | } |