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-rw-r--r--tools/power/cpupower/utils/helpers/sysfs.c112
1 files changed, 60 insertions, 52 deletions
diff --git a/tools/power/cpupower/utils/helpers/sysfs.c b/tools/power/cpupower/utils/helpers/sysfs.c
index 0c534e79652b..55e2466674c6 100644
--- a/tools/power/cpupower/utils/helpers/sysfs.c
+++ b/tools/power/cpupower/utils/helpers/sysfs.c
@@ -19,14 +19,14 @@
unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
{
int fd;
- size_t numread;
+ ssize_t numread;
- if ( ( fd = open(path, O_RDONLY) ) == -1 )
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
return 0;
numread = read(fd, buf, buflen - 1);
- if ( numread < 1 )
- {
+ if (numread < 1) {
close(fd);
return 0;
}
@@ -34,26 +34,26 @@ unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
buf[numread] = '\0';
close(fd);
- return numread;
+ return (unsigned int) numread;
}
static unsigned int sysfs_write_file(const char *path,
const char *value, size_t len)
{
int fd;
- size_t numwrite;
+ ssize_t numwrite;
- if ( ( fd = open(path, O_WRONLY) ) == -1 )
+ fd = open(path, O_WRONLY);
+ if (fd == -1)
return 0;
numwrite = write(fd, value, len);
- if ( numwrite < 1 )
- {
+ if (numwrite < 1) {
close(fd);
return 0;
}
close(fd);
- return numwrite;
+ return (unsigned int) numwrite;
}
/* CPUidle idlestate specific /sys/devices/system/cpu/cpuX/cpuidle/ access */
@@ -69,17 +69,17 @@ unsigned int sysfs_idlestate_read_file(unsigned int cpu, unsigned int idlestate,
{
char path[SYSFS_PATH_MAX];
int fd;
- size_t numread;
+ ssize_t numread;
snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
cpu, idlestate, fname);
- if ( ( fd = open(path, O_RDONLY) ) == -1 )
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
return 0;
numread = read(fd, buf, buflen - 1);
- if ( numread < 1 )
- {
+ if (numread < 1) {
close(fd);
return 0;
}
@@ -87,7 +87,7 @@ unsigned int sysfs_idlestate_read_file(unsigned int cpu, unsigned int idlestate,
buf[numread] = '\0';
close(fd);
- return numread;
+ return (unsigned int) numread;
}
/* read access to files which contain one numeric value */
@@ -116,19 +116,18 @@ static unsigned long long sysfs_idlestate_get_one_value(unsigned int cpu,
char linebuf[MAX_LINE_LEN];
char *endp;
- if ( which >= MAX_IDLESTATE_VALUE_FILES )
+ if (which >= MAX_IDLESTATE_VALUE_FILES)
return 0;
- if ( ( len = sysfs_idlestate_read_file(cpu, idlestate,
- idlestate_value_files[which],
- linebuf, sizeof(linebuf))) == 0 )
- {
+ len = sysfs_idlestate_read_file(cpu, idlestate,
+ idlestate_value_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
return 0;
- }
value = strtoull(linebuf, &endp, 0);
- if ( endp == linebuf || errno == ERANGE )
+ if (endp == linebuf || errno == ERANGE)
return 0;
return value;
@@ -148,9 +147,9 @@ static const char *idlestate_string_files[MAX_IDLESTATE_STRING_FILES] = {
};
-static char * sysfs_idlestate_get_one_string(unsigned int cpu,
- unsigned int idlestate,
- enum idlestate_string which)
+static char *sysfs_idlestate_get_one_string(unsigned int cpu,
+ unsigned int idlestate,
+ enum idlestate_string which)
{
char linebuf[MAX_LINE_LEN];
char *result;
@@ -159,12 +158,14 @@ static char * sysfs_idlestate_get_one_string(unsigned int cpu,
if (which >= MAX_IDLESTATE_STRING_FILES)
return NULL;
- if ( ( len = sysfs_idlestate_read_file(cpu, idlestate,
- idlestate_string_files[which],
- linebuf, sizeof(linebuf))) == 0 )
+ len = sysfs_idlestate_read_file(cpu, idlestate,
+ idlestate_string_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
return NULL;
- if ( ( result = strdup(linebuf) ) == NULL )
+ result = strdup(linebuf);
+ if (result == NULL)
return NULL;
if (result[strlen(result) - 1] == '\n')
@@ -173,27 +174,30 @@ static char * sysfs_idlestate_get_one_string(unsigned int cpu,
return result;
}
-unsigned long sysfs_get_idlestate_latency(unsigned int cpu, unsigned int idlestate)
+unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
+ unsigned int idlestate)
{
return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_LATENCY);
}
-unsigned long sysfs_get_idlestate_usage(unsigned int cpu, unsigned int idlestate)
+unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
+ unsigned int idlestate)
{
return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_USAGE);
}
-unsigned long long sysfs_get_idlestate_time(unsigned int cpu, unsigned int idlestate)
+unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
+ unsigned int idlestate)
{
return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_TIME);
}
-char * sysfs_get_idlestate_name(unsigned int cpu, unsigned int idlestate)
+char *sysfs_get_idlestate_name(unsigned int cpu, unsigned int idlestate)
{
return sysfs_idlestate_get_one_string(cpu, idlestate, IDLESTATE_NAME);
}
-char * sysfs_get_idlestate_desc(unsigned int cpu, unsigned int idlestate)
+char *sysfs_get_idlestate_desc(unsigned int cpu, unsigned int idlestate)
{
return sysfs_idlestate_get_one_string(cpu, idlestate, IDLESTATE_DESC);
}
@@ -211,14 +215,14 @@ int sysfs_get_idlestate_count(unsigned int cpu)
snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpuidle");
- if ( stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+ if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
return -ENODEV;
snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/cpuidle/state0", cpu);
- if ( stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+ if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
return 0;
- while(stat(file, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
+ while (stat(file, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU
"cpu%u/cpuidle/state%d", cpu, idlestates);
idlestates++;
@@ -261,7 +265,7 @@ static const char *cpuidle_string_files[MAX_CPUIDLE_STRING_FILES] = {
};
-static char * sysfs_cpuidle_get_one_string(enum cpuidle_string which)
+static char *sysfs_cpuidle_get_one_string(enum cpuidle_string which)
{
char linebuf[MAX_LINE_LEN];
char *result;
@@ -270,11 +274,13 @@ static char * sysfs_cpuidle_get_one_string(enum cpuidle_string which)
if (which >= MAX_CPUIDLE_STRING_FILES)
return NULL;
- if ( ( len = sysfs_cpuidle_read_file(cpuidle_string_files[which],
- linebuf, sizeof(linebuf))) == 0 )
+ len = sysfs_cpuidle_read_file(cpuidle_string_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
return NULL;
- if ( ( result = strdup(linebuf) ) == NULL )
+ result = strdup(linebuf);
+ if (result == NULL)
return NULL;
if (result[strlen(result) - 1] == '\n')
@@ -283,7 +289,7 @@ static char * sysfs_cpuidle_get_one_string(enum cpuidle_string which)
return result;
}
-char * sysfs_get_cpuidle_governor(void)
+char *sysfs_get_cpuidle_governor(void)
{
char *tmp = sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR_RO);
if (!tmp)
@@ -292,7 +298,7 @@ char * sysfs_get_cpuidle_governor(void)
return tmp;
}
-char * sysfs_get_cpuidle_driver(void)
+char *sysfs_get_cpuidle_driver(void)
{
return sysfs_cpuidle_get_one_string(CPUIDLE_DRIVER);
}
@@ -304,9 +310,9 @@ char * sysfs_get_cpuidle_driver(void)
*
* Returns negative value on failure
*/
-int sysfs_get_sched(const char* smt_mc)
+int sysfs_get_sched(const char *smt_mc)
{
- unsigned long value;
+ unsigned long value;
char linebuf[MAX_LINE_LEN];
char *endp;
char path[SYSFS_PATH_MAX];
@@ -314,11 +320,12 @@ int sysfs_get_sched(const char* smt_mc)
if (strcmp("mc", smt_mc) && strcmp("smt", smt_mc))
return -EINVAL;
- snprintf(path, sizeof(path), PATH_TO_CPU "sched_%s_power_savings", smt_mc);
- if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0 )
+ snprintf(path, sizeof(path),
+ PATH_TO_CPU "sched_%s_power_savings", smt_mc);
+ if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
return -1;
value = strtoul(linebuf, &endp, 0);
- if ( endp == linebuf || errno == ERANGE )
+ if (endp == linebuf || errno == ERANGE)
return -1;
return value;
}
@@ -329,7 +336,7 @@ int sysfs_get_sched(const char* smt_mc)
*
* Returns negative value on failure
*/
-int sysfs_set_sched(const char* smt_mc, int val)
+int sysfs_set_sched(const char *smt_mc, int val)
{
char linebuf[MAX_LINE_LEN];
char path[SYSFS_PATH_MAX];
@@ -338,13 +345,14 @@ int sysfs_set_sched(const char* smt_mc, int val)
if (strcmp("mc", smt_mc) && strcmp("smt", smt_mc))
return -EINVAL;
- snprintf(path, sizeof(path), PATH_TO_CPU "sched_%s_power_savings", smt_mc);
+ snprintf(path, sizeof(path),
+ PATH_TO_CPU "sched_%s_power_savings", smt_mc);
sprintf(linebuf, "%d", val);
- if ( stat(path, &statbuf) != 0 )
+ if (stat(path, &statbuf) != 0)
return -ENODEV;
- if (sysfs_write_file(path, linebuf, MAX_LINE_LEN) == 0 )
+ if (sysfs_write_file(path, linebuf, MAX_LINE_LEN) == 0)
return -1;
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.