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1 | /*- |
2 | * BSD LICENSE | |
3 | * | |
4 | * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * * Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * * Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * * Neither the name of Intel Corporation nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #include <unistd.h> | |
35 | #include <limits.h> | |
36 | #include <string.h> | |
37 | #include <dirent.h> | |
38 | ||
39 | #include <rte_log.h> | |
40 | #include <rte_eal.h> | |
41 | #include <rte_lcore.h> | |
42 | #include <rte_common.h> | |
43 | #include <rte_string_fns.h> | |
44 | #include <rte_debug.h> | |
45 | ||
46 | #include "eal_private.h" | |
47 | #include "eal_filesystem.h" | |
48 | #include "eal_thread.h" | |
49 | ||
50 | #define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u" | |
51 | #define CORE_ID_FILE "topology/core_id" | |
52 | #define NUMA_NODE_PATH "/sys/devices/system/node" | |
53 | ||
54 | /* Check if a cpu is present by the presence of the cpu information for it */ | |
55 | int | |
56 | eal_cpu_detected(unsigned lcore_id) | |
57 | { | |
58 | char path[PATH_MAX]; | |
59 | int len = snprintf(path, sizeof(path), SYS_CPU_DIR | |
60 | "/"CORE_ID_FILE, lcore_id); | |
61 | if (len <= 0 || (unsigned)len >= sizeof(path)) | |
62 | return 0; | |
63 | if (access(path, F_OK) != 0) | |
64 | return 0; | |
65 | ||
66 | return 1; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Get CPU socket id (NUMA node) for a logical core. | |
71 | * | |
72 | * This searches each nodeX directories in /sys for the symlink for the given | |
73 | * lcore_id and returns the numa node where the lcore is found. If lcore is not | |
74 | * found on any numa node, returns zero. | |
75 | */ | |
76 | unsigned | |
77 | eal_cpu_socket_id(unsigned lcore_id) | |
78 | { | |
79 | unsigned socket; | |
80 | ||
81 | for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) { | |
82 | char path[PATH_MAX]; | |
83 | ||
84 | snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH, | |
85 | socket, lcore_id); | |
86 | if (access(path, F_OK) == 0) | |
87 | return socket; | |
88 | } | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* Get the cpu core id value from the /sys/.../cpuX core_id value */ | |
93 | unsigned | |
94 | eal_cpu_core_id(unsigned lcore_id) | |
95 | { | |
96 | char path[PATH_MAX]; | |
97 | unsigned long id; | |
98 | ||
99 | int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE); | |
100 | if (len <= 0 || (unsigned)len >= sizeof(path)) | |
101 | goto err; | |
102 | if (eal_parse_sysfs_value(path, &id) != 0) | |
103 | goto err; | |
104 | return (unsigned)id; | |
105 | ||
106 | err: | |
107 | RTE_LOG(ERR, EAL, "Error reading core id value from %s " | |
108 | "for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id); | |
109 | return 0; | |
110 | } |