1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
4 * (C) 2010 Thomas Renninger <trenn@suse.de>
5 */
6
7
8#include <unistd.h>
9#include <stdio.h>
10#include <errno.h>
11#include <stdlib.h>
12#include <string.h>
13#include <getopt.h>
14
15#include <cpuidle.h>
16
17#include "helpers/sysfs.h"
18#include "helpers/helpers.h"
19#include "helpers/bitmask.h"
20
21#define LINE_LEN 10
22
23static void cpuidle_cpu_output(unsigned int cpu, int verbose)
24{
25 unsigned int idlestates, idlestate;
26 char *tmp;
27
28 idlestates = cpuidle_state_count(cpu);
29 if (idlestates == 0) {
30 printf(_("CPU %u: No idle states\n"), cpu);
31 return;
32 }
33
34 printf(_("Number of idle states: %d\n"), idlestates);
35 printf(_("Available idle states:"));
36 for (idlestate = 0; idlestate < idlestates; idlestate++) {
37 tmp = cpuidle_state_name(cpu, idlestate);
38 if (!tmp)
39 continue;
40 printf(format: " %s", tmp);
41 free(ptr: tmp);
42 }
43 printf(format: "\n");
44
45 if (!verbose)
46 return;
47
48 for (idlestate = 0; idlestate < idlestates; idlestate++) {
49 int disabled = cpuidle_is_state_disabled(cpu, idlestate);
50 /* Disabled interface not supported on older kernels */
51 if (disabled < 0)
52 disabled = 0;
53 tmp = cpuidle_state_name(cpu, idlestate);
54 if (!tmp)
55 continue;
56 printf(format: "%s%s:\n", tmp, (disabled) ? " (DISABLED) " : "");
57 free(ptr: tmp);
58
59 tmp = cpuidle_state_desc(cpu, idlestate);
60 if (!tmp)
61 continue;
62 printf(_("Flags/Description: %s\n"), tmp);
63 free(ptr: tmp);
64
65 printf(_("Latency: %lu\n"),
66 cpuidle_state_latency(cpu, idlestate));
67 printf(_("Residency: %lu\n"),
68 cpuidle_state_residency(cpu, idlestate));
69 printf(_("Usage: %lu\n"),
70 cpuidle_state_usage(cpu, idlestate));
71 printf(_("Duration: %llu\n"),
72 cpuidle_state_time(cpu, idlestate));
73 }
74}
75
76static void cpuidle_general_output(void)
77{
78 char *tmp;
79
80 tmp = cpuidle_get_driver();
81 if (!tmp) {
82 printf(_("Could not determine cpuidle driver\n"));
83 return;
84 }
85
86 printf(_("CPUidle driver: %s\n"), tmp);
87 free(ptr: tmp);
88
89 tmp = cpuidle_get_governor();
90 if (!tmp) {
91 printf(_("Could not determine cpuidle governor\n"));
92 return;
93 }
94
95 printf(_("CPUidle governor: %s\n"), tmp);
96 free(ptr: tmp);
97}
98
99static void proc_cpuidle_cpu_output(unsigned int cpu)
100{
101 long max_allowed_cstate = 2000000000;
102 unsigned int cstate, cstates;
103
104 cstates = cpuidle_state_count(cpu);
105 if (cstates == 0) {
106 printf(_("CPU %u: No C-states info\n"), cpu);
107 return;
108 }
109
110 printf(_("active state: C0\n"));
111 printf(_("max_cstate: C%u\n"), cstates-1);
112 printf(_("maximum allowed latency: %lu usec\n"), max_allowed_cstate);
113 printf(_("states:\t\n"));
114 for (cstate = 1; cstate < cstates; cstate++) {
115 printf(_(" C%d: "
116 "type[C%d] "), cstate, cstate);
117 printf(_("promotion[--] demotion[--] "));
118 printf(_("latency[%03lu] "),
119 cpuidle_state_latency(cpu, cstate));
120 printf(_("residency[%05lu] "),
121 cpuidle_state_residency(cpu, cstate));
122 printf(_("usage[%08lu] "),
123 cpuidle_state_usage(cpu, cstate));
124 printf(_("duration[%020Lu] \n"),
125 cpuidle_state_time(cpu, cstate));
126 }
127}
128
129static struct option info_opts[] = {
130 {"silent", no_argument, NULL, 's'},
131 {"proc", no_argument, NULL, 'o'},
132 { },
133};
134
135static inline void cpuidle_exit(int fail)
136{
137 exit(EXIT_FAILURE);
138}
139
140int cmd_idle_info(int argc, char **argv)
141{
142 extern char *optarg;
143 extern int optind, opterr, optopt;
144 int ret = 0, cont = 1, output_param = 0, verbose = 1;
145 unsigned int cpu = 0;
146
147 do {
148 ret = getopt_long(argc: argc, argv: argv, shortopts: "os", longopts: info_opts, NULL);
149 if (ret == -1)
150 break;
151 switch (ret) {
152 case '?':
153 output_param = '?';
154 cont = 0;
155 break;
156 case 's':
157 verbose = 0;
158 break;
159 case -1:
160 cont = 0;
161 break;
162 case 'o':
163 if (output_param) {
164 output_param = -1;
165 cont = 0;
166 break;
167 }
168 output_param = ret;
169 break;
170 }
171 } while (cont);
172
173 switch (output_param) {
174 case -1:
175 printf(_("You can't specify more than one "
176 "output-specific argument\n"));
177 cpuidle_exit(EXIT_FAILURE);
178 case '?':
179 printf(_("invalid or unknown argument\n"));
180 cpuidle_exit(EXIT_FAILURE);
181 }
182
183 /* Default is: show output of base_cpu only */
184 if (bitmask_isallclear(bmp: cpus_chosen))
185 bitmask_setbit(bmp: cpus_chosen, i: base_cpu);
186
187 if (output_param == 0)
188 cpuidle_general_output();
189
190 for (cpu = bitmask_first(bmp: cpus_chosen);
191 cpu <= bitmask_last(bmp: cpus_chosen); cpu++) {
192
193 if (!bitmask_isbitset(bmp: cpus_chosen, i: cpu))
194 continue;
195
196 printf(_("analyzing CPU %d:\n"), cpu);
197
198 if (sysfs_is_cpu_online(cpu) != 1) {
199 printf(_(" *is offline\n"));
200 printf(format: "\n");
201 continue;
202 }
203
204 switch (output_param) {
205
206 case 'o':
207 proc_cpuidle_cpu_output(cpu);
208 break;
209 case 0:
210 printf(format: "\n");
211 cpuidle_cpu_output(cpu, verbose);
212 break;
213 }
214 printf(format: "\n");
215 }
216 return EXIT_SUCCESS;
217}
218

source code of linux/tools/power/cpupower/utils/cpuidle-info.c