For each detected ACPI Processor object (ACPI0007), search its
device handle for CPPC specific tables (i.e. _CPC) and extract
CPU specific performance capabilities.
Signed-off-by: Ashwin Chaugule <ashwin.chaugule@xxxxxxxxxx>
Reviewed-by: Al Stone <al.stone@xxxxxxxxxx>
---
arch/arm64/Kconfig | 1 +
drivers/acpi/Kconfig | 2 +-
drivers/acpi/processor_driver.c | 4 ++++
include/acpi/processor.h | 9 +++++++++
4 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7796af4..feff114 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -83,6 +83,7 @@ config ARM64
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select HAVE_CONTEXT_TRACKING
+ select ACPI_CPPC_LIB if ACPI
help
ARM 64-bit (AArch64) Linux support.
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 54d73bb..097c02a 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -198,7 +198,7 @@ config ACPI_CPPC_LIB
config ACPI_PROCESSOR
tristate "Processor"
select CPU_IDLE if ACPI_PROCESSOR_IDLE
- depends on X86 || IA64
+ depends on X86 || IA64 || ARM64
default y
help
This driver adds support for the ACPI Processor package. It is required
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 16d44ad..ac3dd51 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -246,6 +246,10 @@ static int __acpi_processor_start(struct acpi_device *device)
if (pr->flags.need_hotplug_init)
return 0;
+ result = acpi_cppc_processor_probe(pr);
+ if (result)
+ return -ENODEV;
+
if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
acpi_processor_power_init(pr);
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index c071a92..6e53b5e 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -328,6 +328,15 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
+#ifdef CONFIG_ACPI_CPPC_LIB
+extern int acpi_cppc_processor_probe(struct acpi_processor *pr);
+#else
+static inline int acpi_cppc_processor_probe(struct acpi_processor *pr)
+{
+ return 0;
+}
+#endif /* CONFIG_ACPI_CPPC_LIB */
+
/* in processor_pdc.c */
void acpi_processor_set_pdc(acpi_handle handle);
--
1.9.1
--
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