Commit 1f81c5ef authored by Len Brown's avatar Len Brown
Browse files

tools/power turbostat: Fix missing SYS_LPI counter on some Chromebooks 



Some Chromebook BIOS' do not export an ACPI LPIT, which is how
Linux finds the residency counter for CPU and SYSTEM low power states,
that is exports in /sys/devices/system/cpu/cpuidle/*residency_us

When these sysfs attributes are missing, check the debugfs attrubte
from the pmc_core driver, which accesses the same counter value.

Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f6708400

tools/power/x86/turbostat/turbostat.c

+14 −9
Original line number Diff line number Diff line
@@ -304,6 +304,10 @@ int *irqs_per_cpu; /* indexed by cpu_num */ 


void setup_all_buffers(void);



char *sys_lpi_file;

char *sys_lpi_file_sysfs = "/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us";

char *sys_lpi_file_debugfs = "/sys/kernel/debug/pmc_core/slp_s0_residency_usec";



int cpu_is_not_present(int cpu)

{

	return !CPU_ISSET_S(cpu, cpu_present_setsize, cpu_present_set);
@@ -2916,8 +2920,6 @@ int snapshot_gfx_mhz(void) 
 *

 * record snapshot of

 * /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us

 *

 * return 1 if config change requires a restart, else return 0

 */

int snapshot_cpu_lpi_us(void)

{
@@ -2941,17 +2943,14 @@ int snapshot_cpu_lpi_us(void) 
/*

 * snapshot_sys_lpi()

 *

 * record snapshot of

 * /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us

 *

 * return 1 if config change requires a restart, else return 0

 * record snapshot of sys_lpi_file

 */

int snapshot_sys_lpi_us(void)

{

	FILE *fp;

	int retval;



	fp = fopen_or_die("/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us", "r");

	fp = fopen_or_die(sys_lpi_file, "r");



	retval = fscanf(fp, "%lld", &cpuidle_cur_sys_lpi_us);

	if (retval != 1) {
@@ -4946,10 +4945,16 @@ void process_cpuid() 
	else

		BIC_NOT_PRESENT(BIC_CPU_LPI);



	if (!access("/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us", R_OK))

	if (!access(sys_lpi_file_sysfs, R_OK)) {

		sys_lpi_file = sys_lpi_file_sysfs;

		BIC_PRESENT(BIC_SYS_LPI);

	else

	} else if (!access(sys_lpi_file_debugfs, R_OK)) {

		sys_lpi_file = sys_lpi_file_debugfs;

		BIC_PRESENT(BIC_SYS_LPI);

	} else {

		sys_lpi_file_sysfs = NULL;

		BIC_NOT_PRESENT(BIC_SYS_LPI);

	}



	if (!quiet)

		decode_misc_feature_control();

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