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=5737Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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

@@ -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

@@ -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

@@ -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

@@ -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 *******************/