1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <stdint.h>
9#include <string.h>
10#include <limits.h>
11#include <cpuidle.h>
12
13#include "helpers/helpers.h"
14#include "idle_monitor/cpupower-monitor.h"
15
16#define CPUIDLE_STATES_MAX 10
17static cstate_t cpuidle_cstates[CPUIDLE_STATES_MAX];
18struct cpuidle_monitor cpuidle_sysfs_monitor;
19
20static unsigned long long **previous_count;
21static unsigned long long **current_count;
22static struct timespec start_time;
23static unsigned long long timediff;
24
25static int cpuidle_get_count_percent(unsigned int id, double *percent,
26				     unsigned int cpu)
27{
28	unsigned long long statediff = current_count[cpu][id]
29		- previous_count[cpu][id];
30	dprint("%s: - diff: %llu - percent: %f (%u)\n",
31	       cpuidle_cstates[id].name, timediff, *percent, cpu);
32
33	if (timediff == 0)
34		*percent = 0.0;
35	else
36		*percent = ((100.0 * statediff) / timediff);
37
38	dprint("%s: - timediff: %llu - statediff: %llu - percent: %f (%u)\n",
39	       cpuidle_cstates[id].name, timediff, statediff, *percent, cpu);
40
41	return 0;
42}
43
44static int cpuidle_start(void)
45{
46	int cpu, state;
47	clock_gettime(CLOCK_REALTIME, &start_time);
48	for (cpu = 0; cpu < cpu_count; cpu++) {
49		for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
50		     state++) {
51			previous_count[cpu][state] =
52				cpuidle_state_time(cpu, state);
53			dprint("CPU %d - State: %d - Val: %llu\n",
54			       cpu, state, previous_count[cpu][state]);
55		}
56	}
57	return 0;
58}
59
60static int cpuidle_stop(void)
61{
62	int cpu, state;
63	struct timespec end_time;
64	clock_gettime(CLOCK_REALTIME, &end_time);
65	timediff = timespec_diff_us(start_time, end_time);
66
67	for (cpu = 0; cpu < cpu_count; cpu++) {
68		for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
69		     state++) {
70			current_count[cpu][state] =
71				cpuidle_state_time(cpu, state);
72			dprint("CPU %d - State: %d - Val: %llu\n",
73			       cpu, state, previous_count[cpu][state]);
74		}
75	}
76	return 0;
77}
78
79void fix_up_intel_idle_driver_name(char *tmp, int num)
80{
81	/* fix up cpuidle name for intel idle driver */
82	if (!strncmp(tmp, "NHM-", 4)) {
83		switch (num) {
84		case 1:
85			strcpy(tmp, "C1");
86			break;
87		case 2:
88			strcpy(tmp, "C3");
89			break;
90		case 3:
91			strcpy(tmp, "C6");
92			break;
93		}
94	} else if (!strncmp(tmp, "SNB-", 4)) {
95		switch (num) {
96		case 1:
97			strcpy(tmp, "C1");
98			break;
99		case 2:
100			strcpy(tmp, "C3");
101			break;
102		case 3:
103			strcpy(tmp, "C6");
104			break;
105		case 4:
106			strcpy(tmp, "C7");
107			break;
108		}
109	} else if (!strncmp(tmp, "ATM-", 4)) {
110		switch (num) {
111		case 1:
112			strcpy(tmp, "C1");
113			break;
114		case 2:
115			strcpy(tmp, "C2");
116			break;
117		case 3:
118			strcpy(tmp, "C4");
119			break;
120		case 4:
121			strcpy(tmp, "C6");
122			break;
123		}
124	}
125}
126
127#ifdef __powerpc__
128void map_power_idle_state_name(char *tmp)
129{
130	if (!strncmp(tmp, "stop0_lite", CSTATE_NAME_LEN))
131		strcpy(tmp, "stop0L");
132	else if (!strncmp(tmp, "stop1_lite", CSTATE_NAME_LEN))
133		strcpy(tmp, "stop1L");
134	else if (!strncmp(tmp, "stop2_lite", CSTATE_NAME_LEN))
135		strcpy(tmp, "stop2L");
136}
137#else
138void map_power_idle_state_name(char *tmp) { }
139#endif
140
141static struct cpuidle_monitor *cpuidle_register(void)
142{
143	int num;
144	char *tmp;
145	int this_cpu;
146
147	this_cpu = sched_getcpu();
148
149	/* Assume idle state count is the same for all CPUs */
150	cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(this_cpu);
151
152	if (cpuidle_sysfs_monitor.hw_states_num <= 0)
153		return NULL;
154
155	for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
156		tmp = cpuidle_state_name(this_cpu, num);
157		if (tmp == NULL)
158			continue;
159
160		map_power_idle_state_name(tmp);
161		fix_up_intel_idle_driver_name(tmp, num);
162		strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
163		free(tmp);
164
165		tmp = cpuidle_state_desc(this_cpu, num);
166		if (tmp == NULL)
167			continue;
168		strncpy(cpuidle_cstates[num].desc, tmp,	CSTATE_DESC_LEN - 1);
169		free(tmp);
170
171		cpuidle_cstates[num].range = RANGE_THREAD;
172		cpuidle_cstates[num].id = num;
173		cpuidle_cstates[num].get_count_percent =
174			cpuidle_get_count_percent;
175	}
176
177	/* Free this at program termination */
178	previous_count = malloc(sizeof(long long *) * cpu_count);
179	current_count = malloc(sizeof(long long *) * cpu_count);
180	for (num = 0; num < cpu_count; num++) {
181		previous_count[num] = malloc(sizeof(long long) *
182					cpuidle_sysfs_monitor.hw_states_num);
183		current_count[num] = malloc(sizeof(long long) *
184					cpuidle_sysfs_monitor.hw_states_num);
185	}
186
187	cpuidle_sysfs_monitor.name_len = strlen(cpuidle_sysfs_monitor.name);
188	return &cpuidle_sysfs_monitor;
189}
190
191void cpuidle_unregister(void)
192{
193	int num;
194
195	for (num = 0; num < cpu_count; num++) {
196		free(previous_count[num]);
197		free(current_count[num]);
198	}
199	free(previous_count);
200	free(current_count);
201}
202
203struct cpuidle_monitor cpuidle_sysfs_monitor = {
204	.name			= "Idle_Stats",
205	.hw_states		= cpuidle_cstates,
206	.start			= cpuidle_start,
207	.stop			= cpuidle_stop,
208	.do_register		= cpuidle_register,
209	.unregister		= cpuidle_unregister,
210	.flags.needs_root	= 0,
211	.overflow_s		= UINT_MAX,
212};
213