Commit aeb01e6d authored by Chen Yu's avatar Chen Yu Committed by Len Brown
Browse files

tools/power turbostat: Print the C-state Pre-wake settings 

C-state pre-wake setting[1] is an optimization for some Intel CPUs to
be woken up from deep C-states in order to reduce latency. According to
the spec, the BIT30 is the C-state Pre-wake Disable. Expose this setting
accordingly.
Sample output from turbostat:
...
cpu51: MSR_IA32_POWER_CTL: 0x1a00a40059 (C1E auto-promotion: DISabled)
C-state Pre-wake: ENabled
cpu51: MSR_TURBO_RATIO_LIMIT: 0x2021212121212224
...

[1] https://intel.github.io/wult/#c-state-pre-wake



Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 8c69da29

tools/power/x86/turbostat/turbostat.c

+14 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ double rapl_dram_energy_units, rapl_energy_units; 
double rapl_joule_counter_range;

unsigned int do_core_perf_limit_reasons;

unsigned int has_automatic_cstate_conversion;

unsigned int dis_cstate_prewake;

unsigned int do_gfx_perf_limit_reasons;

unsigned int do_ring_perf_limit_reasons;

unsigned int crystal_hz;
@@ -2271,6 +2272,8 @@ calculate_tsc_tweak() 
	tsc_tweak = base_hz / tsc_hz;

}



void prewake_cstate_probe(unsigned int family, unsigned int model);



static void

dump_nhm_platform_info(void)

{
@@ -2293,6 +2296,11 @@ dump_nhm_platform_info(void) 
	fprintf(outf, "cpu%d: MSR_IA32_POWER_CTL: 0x%08llx (C1E auto-promotion: %sabled)\n",

		base_cpu, msr, msr & 0x2 ? "EN" : "DIS");



	/* C-state Pre-wake Disable (CSTATE_PREWAKE_DISABLE) */

	if (dis_cstate_prewake)

		fprintf(outf, "C-state Pre-wake: %sabled\n",

			msr & 0x40000000 ? "DIS" : "EN");



	return;

}
@@ -4546,6 +4554,12 @@ void automatic_cstate_conversion_probe(unsigned int family, unsigned int model) 
		has_automatic_cstate_conversion = 1;

}



void prewake_cstate_probe(unsigned int family, unsigned int model)

{

	if (is_icx(family, model))

		dis_cstate_prewake = 1;

}



int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p)

{

	unsigned long long msr;