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 
cpuidle_cpu_output(unsigned int cpu,int verbose)23 static 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(" %s", tmp);
41 		free(tmp);
42 	}
43 	printf("\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("%s%s:\n", tmp, (disabled) ? " (DISABLED) " : "");
57 		free(tmp);
58 
59 		tmp = cpuidle_state_desc(cpu, idlestate);
60 		if (!tmp)
61 			continue;
62 		printf(_("Flags/Description: %s\n"), tmp);
63 		free(tmp);
64 
65 		printf(_("Latency: %lu\n"),
66 		       cpuidle_state_latency(cpu, idlestate));
67 		printf(_("Usage: %lu\n"),
68 		       cpuidle_state_usage(cpu, idlestate));
69 		printf(_("Duration: %llu\n"),
70 		       cpuidle_state_time(cpu, idlestate));
71 	}
72 }
73 
cpuidle_general_output(void)74 static void cpuidle_general_output(void)
75 {
76 	char *tmp;
77 
78 	tmp = cpuidle_get_driver();
79 	if (!tmp) {
80 		printf(_("Could not determine cpuidle driver\n"));
81 		return;
82 	}
83 
84 	printf(_("CPUidle driver: %s\n"), tmp);
85 	free(tmp);
86 
87 	tmp = cpuidle_get_governor();
88 	if (!tmp) {
89 		printf(_("Could not determine cpuidle governor\n"));
90 		return;
91 	}
92 
93 	printf(_("CPUidle governor: %s\n"), tmp);
94 	free(tmp);
95 }
96 
proc_cpuidle_cpu_output(unsigned int cpu)97 static void proc_cpuidle_cpu_output(unsigned int cpu)
98 {
99 	long max_allowed_cstate = 2000000000;
100 	unsigned int cstate, cstates;
101 
102 	cstates = cpuidle_state_count(cpu);
103 	if (cstates == 0) {
104 		printf(_("CPU %u: No C-states info\n"), cpu);
105 		return;
106 	}
107 
108 	printf(_("active state:            C0\n"));
109 	printf(_("max_cstate:              C%u\n"), cstates-1);
110 	printf(_("maximum allowed latency: %lu usec\n"), max_allowed_cstate);
111 	printf(_("states:\t\n"));
112 	for (cstate = 1; cstate < cstates; cstate++) {
113 		printf(_("    C%d:                  "
114 			 "type[C%d] "), cstate, cstate);
115 		printf(_("promotion[--] demotion[--] "));
116 		printf(_("latency[%03lu] "),
117 		       cpuidle_state_latency(cpu, cstate));
118 		printf(_("usage[%08lu] "),
119 		       cpuidle_state_usage(cpu, cstate));
120 		printf(_("duration[%020Lu] \n"),
121 		       cpuidle_state_time(cpu, cstate));
122 	}
123 }
124 
125 static struct option info_opts[] = {
126 	{"silent", no_argument, NULL, 's'},
127 	{"proc", no_argument, NULL, 'o'},
128 	{ },
129 };
130 
cpuidle_exit(int fail)131 static inline void cpuidle_exit(int fail)
132 {
133 	exit(EXIT_FAILURE);
134 }
135 
cmd_idle_info(int argc,char ** argv)136 int cmd_idle_info(int argc, char **argv)
137 {
138 	extern char *optarg;
139 	extern int optind, opterr, optopt;
140 	int ret = 0, cont = 1, output_param = 0, verbose = 1;
141 	unsigned int cpu = 0;
142 
143 	do {
144 		ret = getopt_long(argc, argv, "os", info_opts, NULL);
145 		if (ret == -1)
146 			break;
147 		switch (ret) {
148 		case '?':
149 			output_param = '?';
150 			cont = 0;
151 			break;
152 		case 's':
153 			verbose = 0;
154 			break;
155 		case -1:
156 			cont = 0;
157 			break;
158 		case 'o':
159 			if (output_param) {
160 				output_param = -1;
161 				cont = 0;
162 				break;
163 			}
164 			output_param = ret;
165 			break;
166 		}
167 	} while (cont);
168 
169 	switch (output_param) {
170 	case -1:
171 		printf(_("You can't specify more than one "
172 			 "output-specific argument\n"));
173 		cpuidle_exit(EXIT_FAILURE);
174 	case '?':
175 		printf(_("invalid or unknown argument\n"));
176 		cpuidle_exit(EXIT_FAILURE);
177 	}
178 
179 	/* Default is: show output of CPU 0 only */
180 	if (bitmask_isallclear(cpus_chosen))
181 		bitmask_setbit(cpus_chosen, 0);
182 
183 	if (output_param == 0)
184 		cpuidle_general_output();
185 
186 	for (cpu = bitmask_first(cpus_chosen);
187 	     cpu <= bitmask_last(cpus_chosen); cpu++) {
188 
189 		if (!bitmask_isbitset(cpus_chosen, cpu))
190 			continue;
191 
192 		printf(_("analyzing CPU %d:\n"), cpu);
193 
194 		if (sysfs_is_cpu_online(cpu) != 1) {
195 			printf(_(" *is offline\n"));
196 			printf("\n");
197 			continue;
198 		}
199 
200 		switch (output_param) {
201 
202 		case 'o':
203 			proc_cpuidle_cpu_output(cpu);
204 			break;
205 		case 0:
206 			printf("\n");
207 			cpuidle_cpu_output(cpu, verbose);
208 			break;
209 		}
210 		printf("\n");
211 	}
212 	return EXIT_SUCCESS;
213 }
214