iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/tools/power/cpupower/utils/helpers/sysfs.h

39 lines
1.4 KiB
C
Raw Normal View History

cpupowerutils - cpufrequtils extended with quite some features CPU power consumption vs performance tuning is no longer limited to CPU frequency switching anymore: deep sleep states, traditional dynamic frequency scaling and hidden turbo/boost frequencies are tied close together and depend on each other. The first two exist on different architectures like PPC, Itanium and ARM, the latter (so far) only on X86. On X86 the APU (CPU+GPU) will only run most efficiently if CPU and GPU has proper power management in place. Users and Developers want to have *one* tool to get an overview what their system supports and to monitor and debug CPU power management in detail. The tool should compile and work on as many architectures as possible. Once this tool stabilizes a bit, it is intended to replace the Intel-specific tools in tools/power/x86 Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-03-30 16:30:11 +02:00
#ifndef __CPUPOWER_HELPERS_SYSFS_H__
#define __CPUPOWER_HELPERS_SYSFS_H__
#define PATH_TO_CPU "/sys/devices/system/cpu/"
#define MAX_LINE_LEN 255
#define SYSFS_PATH_MAX 255
extern unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen);
cpupower: Implement disabling of cstate interface Latest kernel allows to disable C-states via: /sys/devices/system/cpu/cpuX/cpuidle/stateY/disable This patch provides lower level sysfs access functions to make use of this interface. A later patch will implement the higher level stuff. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-06-28 15:34:30 +02:00
extern unsigned int sysfs_idlestate_file_exists(unsigned int cpu,
unsigned int idlestate,
const char *fname);
cpupower: Better detect offlined CPUs Before, checking for offlined CPUs was done dirty and it was checked whether topology parsing returned -1 values. But this is a valid case on a Xen (and possibly other) kernels. Do proper online/offline checking, also take CONFIG_HOTPLUG_CPU option into account (no /sys/devices/../cpuX/online file). Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-08-12 01:11:37 +02:00
extern int sysfs_is_cpu_online(unsigned int cpu);
cpupower: Implement disabling of cstate interface Latest kernel allows to disable C-states via: /sys/devices/system/cpu/cpuX/cpuidle/stateY/disable This patch provides lower level sysfs access functions to make use of this interface. A later patch will implement the higher level stuff. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-06-28 15:34:30 +02:00
extern int sysfs_is_idlestate_disabled(unsigned int cpu,
unsigned int idlestate);
extern int sysfs_idlestate_disable(unsigned int cpu, unsigned int idlestate,
unsigned int disable);
cpupowerutils: helpers - ConfigStyle bugfixes Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-04-19 20:16:05 +02:00
extern unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
unsigned int idlestate);
extern unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
unsigned int idlestate);
extern unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
unsigned int idlestate);
extern char *sysfs_get_idlestate_name(unsigned int cpu,
unsigned int idlestate);
extern char *sysfs_get_idlestate_desc(unsigned int cpu,
unsigned int idlestate);
cpupower: Make idlestate usage unsigned Use unsigned int as the data type for some variables related to CPU idle states which allows the code to be simplified slightly. [rjw: Changelog] Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-06-28 15:34:29 +02:00
extern unsigned int sysfs_get_idlestate_count(unsigned int cpu);
cpupowerutils - cpufrequtils extended with quite some features CPU power consumption vs performance tuning is no longer limited to CPU frequency switching anymore: deep sleep states, traditional dynamic frequency scaling and hidden turbo/boost frequencies are tied close together and depend on each other. The first two exist on different architectures like PPC, Itanium and ARM, the latter (so far) only on X86. On X86 the APU (CPU+GPU) will only run most efficiently if CPU and GPU has proper power management in place. Users and Developers want to have *one* tool to get an overview what their system supports and to monitor and debug CPU power management in detail. The tool should compile and work on as many architectures as possible. Once this tool stabilizes a bit, it is intended to replace the Intel-specific tools in tools/power/x86 Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-03-30 16:30:11 +02:00
cpupowerutils: helpers - ConfigStyle bugfixes Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-04-19 20:16:05 +02:00
extern char *sysfs_get_cpuidle_governor(void);
extern char *sysfs_get_cpuidle_driver(void);
cpupowerutils - cpufrequtils extended with quite some features CPU power consumption vs performance tuning is no longer limited to CPU frequency switching anymore: deep sleep states, traditional dynamic frequency scaling and hidden turbo/boost frequencies are tied close together and depend on each other. The first two exist on different architectures like PPC, Itanium and ARM, the latter (so far) only on X86. On X86 the APU (CPU+GPU) will only run most efficiently if CPU and GPU has proper power management in place. Users and Developers want to have *one* tool to get an overview what their system supports and to monitor and debug CPU power management in detail. The tool should compile and work on as many architectures as possible. Once this tool stabilizes a bit, it is intended to replace the Intel-specific tools in tools/power/x86 Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-03-30 16:30:11 +02:00
cpupowerutils: helpers - ConfigStyle bugfixes Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-04-19 20:16:05 +02:00
extern int sysfs_get_sched(const char *smt_mc);
extern int sysfs_set_sched(const char *smt_mc, int val);
cpupowerutils - cpufrequtils extended with quite some features CPU power consumption vs performance tuning is no longer limited to CPU frequency switching anymore: deep sleep states, traditional dynamic frequency scaling and hidden turbo/boost frequencies are tied close together and depend on each other. The first two exist on different architectures like PPC, Itanium and ARM, the latter (so far) only on X86. On X86 the APU (CPU+GPU) will only run most efficiently if CPU and GPU has proper power management in place. Users and Developers want to have *one* tool to get an overview what their system supports and to monitor and debug CPU power management in detail. The tool should compile and work on as many architectures as possible. Once this tool stabilizes a bit, it is intended to replace the Intel-specific tools in tools/power/x86 Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2011-03-30 16:30:11 +02:00
#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */
Reference in New Issue Copy Permalink