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-rw-r--r--arch/arm64/kernel/smp.c1
-rw-r--r--drivers/cpufreq/cppc_cpufreq.c42
2 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 3b46041f2b97..62ed361a4376 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -512,6 +512,7 @@ struct acpi_madt_generic_interrupt *acpi_cpu_get_madt_gicc(int cpu)
{
return &cpu_madt_gicc[cpu];
}
+EXPORT_SYMBOL_GPL(acpi_cpu_get_madt_gicc);
/*
* acpi_map_gic_cpu_interface - parse processor MADT entry
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 82d370ae6a4a..3cd05651707d 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -420,12 +420,53 @@ static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
}
+static DEFINE_PER_CPU(unsigned int, efficiency_class);
+
+static int populate_efficiency_class(void)
+{
+ struct acpi_madt_generic_interrupt *gicc;
+ DECLARE_BITMAP(used_classes, 256) = {};
+ int class, cpu, index;
+
+ for_each_possible_cpu(cpu) {
+ gicc = acpi_cpu_get_madt_gicc(cpu);
+ class = gicc->efficiency_class;
+ bitmap_set(used_classes, class, 1);
+ }
+
+ if (bitmap_weight(used_classes, 256) <= 1) {
+ pr_debug("Efficiency classes are all equal (=%d). "
+ "No EM registered", class);
+ return -EINVAL;
+ }
+
+ /*
+ * Squeeze efficiency class values on [0:#efficiency_class-1].
+ * Values are per spec in [0:255].
+ */
+ index = 0;
+ for_each_set_bit(class, used_classes, 256) {
+ for_each_possible_cpu(cpu) {
+ gicc = acpi_cpu_get_madt_gicc(cpu);
+ if (gicc->efficiency_class == class)
+ per_cpu(efficiency_class, cpu) = index;
+ }
+ index++;
+ }
+
+ return 0;
+}
+
#else
static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
{
return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
}
+static int populate_efficiency_class(void)
+{
+ return 0;
+}
#endif
@@ -742,6 +783,7 @@ static int __init cppc_cpufreq_init(void)
cppc_check_hisi_workaround();
cppc_freq_invariance_init();
+ populate_efficiency_class();
ret = cpufreq_register_driver(&cppc_cpufreq_driver);
if (ret)