Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960// SPDX-License-Identifier: GPL-2.0-only
#include <stdio.h>#include <errno.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>
#include "cpupower_intern.h"#include "acpi_cppc.h"
/* ACPI CPPC sysfs access ***********************************************/
static int acpi_cppc_read_file(unsigned int cpu, const char *fname, char *buf, size_t buflen){ char path[SYSFS_PATH_MAX];
snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/acpi_cppc/%s", cpu, fname); return cpupower_read_sysfs(path, buf, buflen);}
static const char * const acpi_cppc_value_files[] = { [HIGHEST_PERF] = "highest_perf", [LOWEST_PERF] = "lowest_perf", [NOMINAL_PERF] = "nominal_perf", [LOWEST_NONLINEAR_PERF] = "lowest_nonlinear_perf", [LOWEST_FREQ] = "lowest_freq", [NOMINAL_FREQ] = "nominal_freq", [REFERENCE_PERF] = "reference_perf", [WRAPAROUND_TIME] = "wraparound_time"};
unsigned long acpi_cppc_get_data(unsigned int cpu, enum acpi_cppc_value which){ unsigned long long value; unsigned int len; char linebuf[MAX_LINE_LEN]; char *endp;
if (which >= MAX_CPPC_VALUE_FILES) return 0;
len = acpi_cppc_read_file(cpu, acpi_cppc_value_files[which], linebuf, sizeof(linebuf)); if (len == 0) return 0;
value = strtoull(linebuf, &endp, 0);
if (endp == linebuf || errno == ERANGE) return 0;
return value;}