1 /************************************************************************
2 Copyright (c) 2015, The Linux Foundation. All rights reserved.
3
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5 modification, are permitted provided that the following conditions are
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28 ************************************************************************/
29
30 /**
31 * @file datatop_cpu_stats_poll.c
32 * @brief Calls dtop_value_only_init for necessary cpu datapoints.
33 *
34 * File contains methods for determing number of cpu's online and calling
35 * correct initialization function to gather scaling_cur_freq data point
36 * for each cpu along with each cpu's online status.
37 */
38
39 #include <unistd.h>
40 #include <stdio.h>
41 #include <dirent.h>
42 #include <string.h>
43 #include <stdlib.h>
44 #include <errno.h>
45 #include <sys/stat.h>
46 #include <sys/types.h>
47 #include <ctype.h>
48 #include "datatop_interface.h"
49 #include "datatop_fileops.h"
50 #include "datatop_str.h"
51 #include "datatop_polling.h"
52
53 #define DTOP_GEN_SIZE 8192
54 #define DTOP_GEN_LINE (DTOP_GEN_SIZE>>2)
55 #define NO_CPUS_ONLINE -1
56
57 /**
58 * @brief Searches /sys/devices/system/cpu/ directory to get find number of CPUs.
59 *
60 * @return Number of CPUs found in directory.
61 */
dtop_cpu_search(void)62 static int dtop_cpu_search(void)
63 {
64 DIR *dp;
65 struct dirent *entry;
66 struct stat s;
67 int cpu_amt;
68 char cwd[1024];
69
70 if (!getcwd(cwd, sizeof(cwd))) {
71 fprintf(stderr, "Failed to get current working dir\n");
72 return -1;
73 }
74
75 dp = opendir("/sys/devices/system/cpu/");
76 if (dp == NULL) {
77 fprintf(stderr, "err=%d: %s\n", errno, strerror(errno));
78 fprintf(stderr, "Cannot open directory: %s\n",
79 "/sys/devices/system/cpu/");
80 return NO_CPUS_ONLINE;
81 }
82
83 chdir("/sys/devices/system/cpu/");
84 cpu_amt = 0;
85 while ((entry = readdir(dp))) {
86 if (stat(entry->d_name, &s)) {
87 printf("stat err=%d: %s\n", errno, strerror(errno));
88 return NO_CPUS_ONLINE;
89 }
90
91 if (entry->d_name[0] == 'c' &&
92 entry->d_name[1] == 'p' &&
93 entry->d_name[2] == 'u' &&
94 (isdigit(entry->d_name[3]))) {
95
96 cpu_amt++;
97 }
98 }
99
100 closedir(dp);
101 chdir(cwd);
102 return cpu_amt;
103 }
104
105 /**
106 * @brief Creates a dpg designed for CPU online and CPU scaling_cur_freq stats.
107 *
108 * @param name Name of file dpg represents.
109 */
construct_cpu_stat_dpg(char * name)110 static void construct_cpu_stat_dpg(char *name)
111 {
112 char *file = malloc(strlen(name) + 1);
113 struct dtop_data_point *dp =
114 malloc(sizeof(struct dtop_data_point));
115 struct dtop_data_point_gatherer *dpg = malloc
116 (sizeof(struct dtop_data_point_gatherer));
117
118 strlcpy(file, name, strlen(name) + 1);
119
120 dp[0].type = DTOP_ULONG;
121 dp[0].name = malloc(5);
122 strlcpy(dp[0].name, "", 5);
123 dp[0].prefix = NULL;
124 dp[0].data.d_ulong = 0;
125 dp[0].initial_data.d_ulong = 0;
126 dp[0].skip = DO_NOT_SKIP;
127 dp[0].initial_data_populated = NOT_POPULATED;
128
129 dpg->prefix = file;
130 dpg->file = file;
131 dpg->poll = dtop_value_only_poll;
132 dpg->data_points = dp;
133 dpg->data_points_len = 1;
134 dpg->deconstruct = dtop_value_only_dpg_deconstructor;
135
136 dtop_register(dpg);
137 }
138
139 /**
140 * @brief Calls dpg constructor for necessary CPU stat files.
141 *
142 * Creates file names based on number of CPUs found and calls the
143 * dpg constructor for them.
144 *
145 * @param file Directory where the CPUs are found.
146 * @param add String which is concatenated onto file and represents
147 * the path after a CPU directory is entered.
148 * @param cpu_amt Amount of CPUs found on device.
149 */
cpu_poll_helper(char * file,char * add,int cpu_amt)150 static void cpu_poll_helper(char *file, char *add, int cpu_amt)
151 {
152 int i;
153 for (i = 0; i < cpu_amt; i++) {
154 char *cpu_num = malloc(5);
155 char *newfile;
156 int nf_len;
157 snprintf(cpu_num, 5, "%d", i);
158 nf_len = strlen(file) + strlen(add) + strlen(cpu_num) + 2;
159 newfile = malloc(nf_len);
160 strlcpy(newfile, file, nf_len);
161 strlcat(newfile, cpu_num, nf_len);
162 strlcat(newfile, add, nf_len);
163 free(cpu_num);
164 construct_cpu_stat_dpg(newfile);
165 free(newfile);
166 }
167 }
168
169 /**
170 * @brief Calls necessary functions for CPU stat dpgs.
171 */
dtop_cpu_stats_init(void)172 void dtop_cpu_stats_init(void)
173 {
174 int cpu_amt;
175 char *file = "/sys/devices/system/cpu/cpu";
176 char *add = "/cpufreq/scaling_cur_freq";
177
178 cpu_amt = dtop_cpu_search();
179 cpu_poll_helper(file, add, cpu_amt);
180 add = "/online";
181 cpu_poll_helper(file, add, cpu_amt);
182 }
183