diff options
Diffstat (limited to 'tools/power/cpupower/utils/helpers/misc.c')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/misc.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c index f406adc40bad..e8f8f643a627 100644 --- a/tools/power/cpupower/utils/helpers/misc.c +++ b/tools/power/cpupower/utils/helpers/misc.c @@ -1,7 +1,15 @@ // SPDX-License-Identifier: GPL-2.0 + +#include <stdio.h> +#include <errno.h> +#include <stdlib.h> + #if defined(__i386__) || defined(__x86_64__) #include "helpers/helpers.h" +#include "helpers/sysfs.h" + +#include "cpupower_intern.h" #define MSR_AMD_HWCR 0xc0010015 @@ -40,4 +48,44 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active, *support = *active = 1; return 0; } + +int cpupower_intel_get_perf_bias(unsigned int cpu) +{ + char linebuf[MAX_LINE_LEN]; + char path[SYSFS_PATH_MAX]; + unsigned long val; + char *endp; + + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) + return -1; + + snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/power/energy_perf_bias", cpu); + + if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0) + return -1; + + val = strtol(linebuf, &endp, 0); + if (endp == linebuf || errno == ERANGE) + return -1; + + return val; +} + +int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val) +{ + char path[SYSFS_PATH_MAX]; + char linebuf[3] = {}; + + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) + return -1; + + snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/power/energy_perf_bias", cpu); + snprintf(linebuf, sizeof(linebuf), "%d", val); + + if (cpupower_write_sysfs(path, linebuf, 3) <= 0) + return -1; + + return 0; +} + #endif /* #if defined(__i386__) || defined(__x86_64__) */ |