1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2023 Ventana Micro Systems Inc.
4 *
5 * Test the RISCV_HWPROBE_WHICH_CPUS flag of hwprobe. Also provides a command
6 * line interface to get the cpu list for arbitrary hwprobe pairs.
7 */
8 #define _GNU_SOURCE
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <sched.h>
13 #include <unistd.h>
14 #include <assert.h>
15
16 #include "hwprobe.h"
17 #include "../../kselftest.h"
18
19 static void help(void)
20 {
21 printf("\n"
22 "which-cpus: [-h] [<key=value> [<key=value> ...]]\n\n"
23 " Without parameters, tests the RISCV_HWPROBE_WHICH_CPUS flag of hwprobe.\n"
24 " With parameters, where each parameter is a hwprobe pair written as\n"
25 " <key=value>, outputs the cpulist for cpus which all match the given set\n"
26 " of pairs. 'key' and 'value' should be in numeric form, e.g. 4=0x3b\n");
27 }
28
29 static void print_cpulist(cpu_set_t *cpus)
30 {
31 int start = 0, end = 0;
32
33 if (!CPU_COUNT(cpus)) {
34 printf("cpus: None\n");
35 return;
36 }
37
38 printf("cpus:");
39 for (int i = 0, c = 0; i < CPU_COUNT(cpus); i++, c++) {
40 if (start != end && !CPU_ISSET(c, cpus))
41 printf("-%d", end);
42
43 while (!CPU_ISSET(c, cpus))
44 ++c;
45
46 if (i != 0 && c == end + 1) {
47 end = c;
48 continue;
49 }
50
51 printf("%c%d", i == 0 ? ' ' : ',', c);
52 start = end = c;
53 }
54 if (start != end)
55 printf("-%d", end);
56 printf("\n");
57 }
58
59 static void do_which_cpus(int argc, char **argv, cpu_set_t *cpus)
60 {
61 struct riscv_hwprobe *pairs;
62 int nr_pairs = argc - 1;
63 char *start, *end;
64 int rc;
65
66 pairs = malloc(nr_pairs * sizeof(struct riscv_hwprobe));
67 assert(pairs);
68
69 for (int i = 0; i < nr_pairs; i++) {
70 start = argv[i + 1];
71 pairs[i].key = strtol(start, &end, 0);
72 assert(end != start && *end == '=');
73 start = end + 1;
74 pairs[i].value = strtoul(start, &end, 0);
75 assert(end != start && *end == '\0');
76 }
77
78 rc = riscv_hwprobe(pairs, nr_pairs, sizeof(cpu_set_t), (unsigned long *)cpus, RISCV_HWPROBE_WHICH_CPUS);
79 assert(rc == 0);
80 print_cpulist(cpus);
81 free(pairs);
82 }
83
84 int main(int argc, char **argv)
85 {
86 struct riscv_hwprobe pairs[2];
87 cpu_set_t cpus_aff, cpus;
88 __u64 ext0_all;
89 long rc;
90
91 rc = sched_getaffinity(0, sizeof(cpu_set_t), &cpus_aff);
92 assert(rc == 0);
93
94 if (argc > 1) {
95 if (!strcmp(argv[1], "-h"))
96 help();
97 else
98 do_which_cpus(argc, argv, &cpus_aff);
99 return 0;
100 }
101
102 ksft_print_header();
103 ksft_set_plan(7);
104
105 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, };
106 rc = riscv_hwprobe(pairs, 1, 0, NULL, 0);
107 assert(rc == 0 && pairs[0].key == RISCV_HWPROBE_KEY_BASE_BEHAVIOR &&
108 pairs[0].value == RISCV_HWPROBE_BASE_BEHAVIOR_IMA);
109
110 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_IMA_EXT_0, };
111 rc = riscv_hwprobe(pairs, 1, 0, NULL, 0);
112 assert(rc == 0 && pairs[0].key == RISCV_HWPROBE_KEY_IMA_EXT_0);
113 ext0_all = pairs[0].value;
114
115 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
116 CPU_ZERO(&cpus);
117 rc = riscv_hwprobe(pairs, 1, 0, (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
118 ksft_test_result(rc == -EINVAL, "no cpusetsize\n");
119
120 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
121 rc = riscv_hwprobe(pairs, 1, sizeof(cpu_set_t), NULL, RISCV_HWPROBE_WHICH_CPUS);
122 ksft_test_result(rc == -EINVAL, "NULL cpus\n");
123
124 pairs[0] = (struct riscv_hwprobe){ .key = 0xbadc0de, };
125 CPU_ZERO(&cpus);
126 rc = riscv_hwprobe(pairs, 1, sizeof(cpu_set_t), (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
127 ksft_test_result(rc == 0 && CPU_COUNT(&cpus) == 0, "unknown key\n");
128
129 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
130 pairs[1] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
131 CPU_ZERO(&cpus);
132 rc = riscv_hwprobe(pairs, 2, sizeof(cpu_set_t), (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
133 ksft_test_result(rc == 0, "duplicate keys\n");
134
135 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
136 pairs[1] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_IMA_EXT_0, .value = ext0_all, };
137 CPU_ZERO(&cpus);
138 rc = riscv_hwprobe(pairs, 2, sizeof(cpu_set_t), (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
139 ksft_test_result(rc == 0 && CPU_COUNT(&cpus) == sysconf(_SC_NPROCESSORS_ONLN), "set all cpus\n");
140
141 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
142 pairs[1] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_IMA_EXT_0, .value = ext0_all, };
143 memcpy(&cpus, &cpus_aff, sizeof(cpu_set_t));
144 rc = riscv_hwprobe(pairs, 2, sizeof(cpu_set_t), (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
145 ksft_test_result(rc == 0 && CPU_EQUAL(&cpus, &cpus_aff), "set all affinity cpus\n");
146
147 pairs[0] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR, .value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA, };
148 pairs[1] = (struct riscv_hwprobe){ .key = RISCV_HWPROBE_KEY_IMA_EXT_0, .value = ~ext0_all, };
149 memcpy(&cpus, &cpus_aff, sizeof(cpu_set_t));
150 rc = riscv_hwprobe(pairs, 2, sizeof(cpu_set_t), (unsigned long *)&cpus, RISCV_HWPROBE_WHICH_CPUS);
151 ksft_test_result(rc == 0 && CPU_COUNT(&cpus) == 0, "clear all cpus\n");
152
153 ksft_finished();
154 }
155
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