1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel Speed Select -- Allow speed select to daemonize
4 * Copyright (c) 2022 Intel Corporation.
5 */
6
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <stdarg.h>
10 #include <string.h>
11 #include <unistd.h>
12 #include <fcntl.h>
13 #include <sys/file.h>
14 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <errno.h>
17 #include <getopt.h>
18 #include <signal.h>
19 #include <time.h>
20
21 #include "isst.h"
22
23 static int per_package_levels_info[MAX_PACKAGE_COUNT][MAX_DIE_PER_PACKAGE][MAX_PUNIT_PER_DIE];
24 static time_t per_package_levels_tm[MAX_PACKAGE_COUNT][MAX_DIE_PER_PACKAGE][MAX_PUNIT_PER_DIE];
25
init_levels(void)26 static void init_levels(void)
27 {
28 int i, j, k;
29
30 for (i = 0; i < MAX_PACKAGE_COUNT; ++i)
31 for (j = 0; j < MAX_DIE_PER_PACKAGE; ++j)
32 for (k = 0; k < MAX_PUNIT_PER_DIE; ++k)
33 per_package_levels_info[i][j][k] = -1;
34 }
35
process_level_change(struct isst_id * id)36 void process_level_change(struct isst_id *id)
37 {
38 struct isst_pkg_ctdp_level_info ctdp_level;
39 struct isst_pkg_ctdp pkg_dev;
40 time_t tm;
41 int ret;
42
43 if (id->pkg < 0 || id->die < 0 || id->punit < 0) {
44 debug_printf("Invalid package/die info for cpu:%d\n", id->cpu);
45 return;
46 }
47
48 tm = time(NULL);
49 if (tm - per_package_levels_tm[id->pkg][id->die][id->punit] < 2)
50 return;
51
52 per_package_levels_tm[id->pkg][id->die][id->punit] = tm;
53
54 ret = isst_get_ctdp_levels(id, &pkg_dev);
55 if (ret) {
56 debug_printf("Can't get tdp levels for cpu:%d\n", id->cpu);
57 return;
58 }
59
60 debug_printf("Get Config level %d pkg:%d die:%d current_level:%d\n", id->cpu,
61 id->pkg, id->die, pkg_dev.current_level);
62
63 if (pkg_dev.locked) {
64 debug_printf("config TDP s locked \n");
65 return;
66 }
67
68 if (per_package_levels_info[id->pkg][id->die][id->punit] == pkg_dev.current_level)
69 return;
70
71 debug_printf("**Config level change for cpu:%d pkg:%d die:%d from %d to %d\n",
72 id->cpu, id->pkg, id->die, per_package_levels_info[id->pkg][id->die][id->punit],
73 pkg_dev.current_level);
74
75 per_package_levels_info[id->pkg][id->die][id->punit] = pkg_dev.current_level;
76
77 ctdp_level.core_cpumask_size =
78 alloc_cpu_set(&ctdp_level.core_cpumask);
79 ret = isst_get_coremask_info(id, pkg_dev.current_level, &ctdp_level);
80 if (ret) {
81 free_cpu_set(ctdp_level.core_cpumask);
82 debug_printf("Can't get core_mask:%d\n", id->cpu);
83 return;
84 }
85
86 if (use_cgroupv2()) {
87 int ret;
88
89 ret = enable_cpuset_controller();
90 if (ret)
91 goto use_offline;
92
93 isolate_cpus(id, ctdp_level.core_cpumask_size, ctdp_level.core_cpumask, pkg_dev.current_level);
94
95 goto free_mask;
96 }
97
98 use_offline:
99 if (ctdp_level.cpu_count) {
100 int i, max_cpus = get_topo_max_cpus();
101 for (i = 0; i < max_cpus; ++i) {
102 if (!is_cpu_in_power_domain(i, id))
103 continue;
104 if (CPU_ISSET_S(i, ctdp_level.core_cpumask_size, ctdp_level.core_cpumask)) {
105 fprintf(stderr, "online cpu %d\n", i);
106 set_cpu_online_offline(i, 1);
107 } else {
108 fprintf(stderr, "offline cpu %d\n", i);
109 set_cpu_online_offline(i, 0);
110 }
111 }
112 }
113 free_mask:
114 free_cpu_set(ctdp_level.core_cpumask);
115 }
116
_poll_for_config_change(struct isst_id * id,void * arg1,void * arg2,void * arg3,void * arg4)117 static void _poll_for_config_change(struct isst_id *id, void *arg1, void *arg2,
118 void *arg3, void *arg4)
119 {
120 process_level_change(id);
121 }
122
poll_for_config_change(void)123 static void poll_for_config_change(void)
124 {
125 for_each_online_power_domain_in_set(_poll_for_config_change, NULL, NULL,
126 NULL, NULL);
127 }
128
129 static int done = 0;
130 static int pid_file_handle;
131
signal_handler(int sig)132 static void signal_handler(int sig)
133 {
134 switch (sig) {
135 case SIGINT:
136 case SIGTERM:
137 done = 1;
138 hfi_exit();
139 exit(0);
140 break;
141 default:
142 break;
143 }
144 }
145
daemonize(char * rundir,char * pidfile)146 static void daemonize(char *rundir, char *pidfile)
147 {
148 int pid, sid, i;
149 char str[10];
150 struct sigaction sig_actions;
151 sigset_t sig_set;
152 int ret;
153
154 if (getppid() == 1)
155 return;
156
157 sigemptyset(&sig_set);
158 sigaddset(&sig_set, SIGCHLD);
159 sigaddset(&sig_set, SIGTSTP);
160 sigaddset(&sig_set, SIGTTOU);
161 sigaddset(&sig_set, SIGTTIN);
162 sigprocmask(SIG_BLOCK, &sig_set, NULL);
163
164 sig_actions.sa_handler = signal_handler;
165 sigemptyset(&sig_actions.sa_mask);
166 sig_actions.sa_flags = 0;
167
168 sigaction(SIGHUP, &sig_actions, NULL);
169 sigaction(SIGTERM, &sig_actions, NULL);
170 sigaction(SIGINT, &sig_actions, NULL);
171
172 pid = fork();
173 if (pid < 0) {
174 /* Could not fork */
175 exit(EXIT_FAILURE);
176 }
177 if (pid > 0)
178 exit(EXIT_SUCCESS);
179
180 umask(027);
181
182 sid = setsid();
183 if (sid < 0)
184 exit(EXIT_FAILURE);
185
186 /* close all descriptors */
187 for (i = getdtablesize(); i >= 0; --i)
188 close(i);
189
190 i = open("/dev/null", O_RDWR);
191 if (i < 0)
192 exit(EXIT_FAILURE);
193
194 ret = dup(i);
195 if (ret == -1)
196 exit(EXIT_FAILURE);
197
198 ret = chdir(rundir);
199 if (ret == -1)
200 exit(EXIT_FAILURE);
201
202 pid_file_handle = open(pidfile, O_RDWR | O_CREAT, 0600);
203 if (pid_file_handle == -1) {
204 /* Couldn't open lock file */
205 exit(1);
206 }
207 /* Try to lock file */
208 #ifdef LOCKF_SUPPORT
209 if (lockf(pid_file_handle, F_TLOCK, 0) == -1) {
210 #else
211 if (flock(pid_file_handle, LOCK_EX|LOCK_NB) < 0) {
212 #endif
213 /* Couldn't get lock on lock file */
214 fprintf(stderr, "Couldn't get lock file %d\n", getpid());
215 exit(1);
216 }
217 snprintf(str, sizeof(str), "%d\n", getpid());
218 ret = write(pid_file_handle, str, strlen(str));
219 if (ret == -1)
220 exit(EXIT_FAILURE);
221
222 close(i);
223 }
224
225 int isst_daemon(int debug_mode, int poll_interval, int no_daemon)
226 {
227 int ret;
228
229 if (!no_daemon && poll_interval < 0 && !debug_mode) {
230 fprintf(stderr, "OOB mode is enabled and will run as daemon\n");
231 daemonize((char *) "/tmp/",
232 (char *)"/tmp/hfi-events.pid");
233 } else {
234 signal(SIGINT, signal_handler);
235 }
236
237 init_levels();
238
239 if (poll_interval < 0) {
240 ret = hfi_main();
241 if (ret) {
242 fprintf(stderr, "HFI initialization failed\n");
243 }
244 fprintf(stderr, "Must specify poll-interval\n");
245 return ret;
246 }
247
248 debug_printf("Starting loop\n");
249 while (!done) {
250 sleep(poll_interval);
251 poll_for_config_change();
252 }
253
254 return 0;
255 }
256