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Commit 46f18e3a authored by Venkatesh Pallipadi's avatar Venkatesh Pallipadi Committed by Len Brown
Browse files

ACPI: HW P-state coordination support 

Treat HW coordination as independent CPUs.
This enables per-cpu monintoring of P-states

http://bugzilla.kernel.org/show_bug.cgi?id=5737



Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 3448097f

arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c

+7 −1
Original line number Diff line number Diff line
@@ -418,8 +418,14 @@ acpi_cpufreq_cpu_init ( 
		goto err_free;



	perf = data->acpi_data;

	policy->cpus = perf->shared_cpu_map;

	policy->shared_type = perf->shared_type;

	/*

	 * Will let policy->cpus know about dependency only when software 

	 * coordination is required.

	 */

	if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||

	    policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)

		policy->cpus = perf->shared_cpu_map;



	if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {

		acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;

arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c

+7 −1
Original line number Diff line number Diff line
@@ -399,8 +399,14 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy) 
		dprintk(PFX "obtaining ACPI data failed\n");

		return -EIO;

	}

	policy->cpus = p->shared_cpu_map;

	policy->shared_type = p->shared_type;

	/*

	 * Will let policy->cpus know about dependency only when software 

	 * coordination is required.

	 */

	if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||

	    policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)

		policy->cpus = p->shared_cpu_map;



	/* verify the acpi_data */

	if (p->state_count <= 1) {

drivers/acpi/processor_perflib.c

+4 −4
Original line number Diff line number Diff line
@@ -698,12 +698,12 @@ int acpi_processor_preregister_performance( 
		/* Validate the Domain info */

		count_target = pdomain->num_processors;

		count = 1;

		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL ||

		    pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) {

		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)

			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;

		} else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) {

		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)

			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;

		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)

			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;

		}



		for_each_possible_cpu(j) {

			if (i == j)

include/linux/cpufreq.h

+4 −2
Original line number Diff line number Diff line
@@ -100,8 +100,10 @@ struct cpufreq_policy { 
#define CPUFREQ_INCOMPATIBLE	(1)

#define CPUFREQ_NOTIFY		(2)



#define CPUFREQ_SHARED_TYPE_ALL	(0) /* All dependent CPUs should set freq */

#define CPUFREQ_SHARED_TYPE_ANY	(1) /* Freq can be set from any dependent CPU */

#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */

#define CPUFREQ_SHARED_TYPE_HW	 (1) /* HW does needed coordination */

#define CPUFREQ_SHARED_TYPE_ALL	 (2) /* All dependent CPUs should set freq */

#define CPUFREQ_SHARED_TYPE_ANY	 (3) /* Freq can be set from any dependent CPU*/



/******************** cpufreq transition notifiers *******************/