1 /**
2 * collectd - src/irq.c
3 * Copyright (C) 2007 Peter Holik
4 * Copyright (C) 2011 Florian Forster
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Peter Holik <peter at holik.at>
22 **/
23
24 #include "collectd.h"
25
26 #include "plugin.h"
27 #include "utils/common/common.h"
28 #include "utils/ignorelist/ignorelist.h"
29
30 #if !KERNEL_LINUX && !KERNEL_NETBSD
31 #error "No applicable input method."
32 #endif
33
34 #if KERNEL_NETBSD
35 #include <malloc.h>
36 #include <sys/evcnt.h>
37 #include <sys/param.h>
38 #include <sys/sysctl.h>
39 #include <sys/types.h>
40 #endif /* KERNEL_NETBSD */
41
42 /*
43 * (Module-)Global variables
44 */
45 static const char *config_keys[] = {"Irq", "IgnoreSelected"};
46 static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
47
48 static ignorelist_t *ignorelist;
49
50 /*
51 * Private functions
52 */
irq_config(const char * key,const char * value)53 static int irq_config(const char *key, const char *value) {
54 if (ignorelist == NULL)
55 ignorelist = ignorelist_create(/* invert = */ 1);
56
57 if (strcasecmp(key, "Irq") == 0) {
58 ignorelist_add(ignorelist, value);
59 } else if (strcasecmp(key, "IgnoreSelected") == 0) {
60 int invert = 1;
61 if (IS_TRUE(value))
62 invert = 0;
63 ignorelist_set_invert(ignorelist, invert);
64 } else {
65 return -1;
66 }
67
68 return 0;
69 }
70
irq_submit(const char * irq_name,derive_t value)71 static void irq_submit(const char *irq_name, derive_t value) {
72 value_list_t vl = VALUE_LIST_INIT;
73
74 if (ignorelist_match(ignorelist, irq_name) != 0)
75 return;
76
77 vl.values = &(value_t){.derive = value};
78 vl.values_len = 1;
79 sstrncpy(vl.plugin, "irq", sizeof(vl.plugin));
80 sstrncpy(vl.type, "irq", sizeof(vl.type));
81 sstrncpy(vl.type_instance, irq_name, sizeof(vl.type_instance));
82
83 plugin_dispatch_values(&vl);
84 } /* void irq_submit */
85
86 #if KERNEL_LINUX
irq_read(void)87 static int irq_read(void) {
88 FILE *fh;
89 char buffer[1024];
90 int cpu_count;
91 char *fields[256];
92
93 /*
94 * Example content:
95 * CPU0 CPU1 CPU2 CPU3
96 * 0: 2574 1 3 2 IO-APIC-edge timer
97 * 1: 102553 158669 218062 70587 IO-APIC-edge i8042
98 * 8: 0 0 0 1 IO-APIC-edge rtc0
99 */
100 fh = fopen("/proc/interrupts", "r");
101 if (fh == NULL) {
102 ERROR("irq plugin: fopen (/proc/interrupts): %s", STRERRNO);
103 return -1;
104 }
105
106 /* Get CPU count from the first line */
107 if (fgets(buffer, sizeof(buffer), fh) != NULL) {
108 cpu_count = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
109 } else {
110 ERROR("irq plugin: unable to get CPU count from first line "
111 "of /proc/interrupts");
112 fclose(fh);
113 return -1;
114 }
115
116 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
117 char *irq_name;
118 size_t irq_name_len;
119 derive_t irq_value;
120 int i;
121 int fields_num;
122 int irq_values_to_parse;
123
124 fields_num = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
125 if (fields_num < 2)
126 continue;
127
128 /* Parse this many numeric fields, skip the rest
129 * (+1 because first there is a name of irq in each line) */
130 if (fields_num >= cpu_count + 1)
131 irq_values_to_parse = cpu_count;
132 else
133 irq_values_to_parse = fields_num - 1;
134
135 /* First field is irq name and colon */
136 irq_name = fields[0];
137 irq_name_len = strlen(irq_name);
138 if (irq_name_len < 2)
139 continue;
140
141 /* Check if irq name ends with colon.
142 * Otherwise it's a header. */
143 if (irq_name[irq_name_len - 1] != ':')
144 continue;
145
146 /* Is it the the ARM fast interrupt (FIQ)? */
147 if (irq_name_len == 4 && (strncmp(irq_name, "FIQ:", 4) == 0))
148 continue;
149
150 irq_name[irq_name_len - 1] = '\0';
151 irq_name_len--;
152
153 irq_value = 0;
154 for (i = 1; i <= irq_values_to_parse; i++) {
155 /* Per-CPU value */
156 value_t v;
157 int status;
158
159 status = parse_value(fields[i], &v, DS_TYPE_DERIVE);
160 if (status != 0)
161 break;
162
163 irq_value += v.derive;
164 } /* for (i) */
165
166 /* No valid fields -> do not submit anything. */
167 if (i <= 1)
168 continue;
169
170 irq_submit(irq_name, irq_value);
171 }
172
173 fclose(fh);
174
175 return 0;
176 } /* int irq_read */
177 #endif /* KERNEL_LINUX */
178
179 #if KERNEL_NETBSD
irq_read(void)180 static int irq_read(void) {
181 const int mib[4] = {CTL_KERN, KERN_EVCNT, EVCNT_TYPE_INTR,
182 KERN_EVCNT_COUNT_NONZERO};
183 size_t buflen = 0;
184 void *buf = NULL;
185 const struct evcnt_sysctl *evs, *last_evs;
186
187 for (;;) {
188 size_t newlen;
189 int error;
190
191 newlen = buflen;
192 if (buflen)
193 buf = malloc(buflen);
194 error = sysctl(mib, __arraycount(mib), buf, &newlen, NULL, 0);
195 if (error) {
196 ERROR("irq plugin: failed to get event count");
197 return -1;
198 }
199 if (newlen <= buflen) {
200 buflen = newlen;
201 break;
202 }
203 if (buf)
204 free(buf);
205 buflen = newlen;
206 }
207 evs = buf;
208 last_evs = (void *)((char *)buf + buflen);
209 buflen /= sizeof(uint64_t);
210 while (evs < last_evs && buflen > sizeof(*evs) / sizeof(uint64_t) &&
211 buflen >= evs->ev_len) {
212 char irqname[80];
213
214 snprintf(irqname, 80, "%s-%s", evs->ev_strings,
215 evs->ev_strings + evs->ev_grouplen + 1);
216
217 irq_submit(irqname, evs->ev_count);
218
219 buflen -= evs->ev_len;
220 evs = (const void *)((const uint64_t *)evs + evs->ev_len);
221 }
222 free(buf);
223 return 0;
224 }
225 #endif /* KERNEL_NETBSD */
226
module_register(void)227 void module_register(void) {
228 plugin_register_config("irq", irq_config, config_keys, config_keys_num);
229 plugin_register_read("irq", irq_read);
230 } /* void module_register */
231