[v9,4/5] CPPC: Probe for CPPC tables for each ACPI Processor object

Commit Message

Ashwin Chaugule Sept. 9, 2015, 8:27 p.m. UTC

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 <[e-mail]>
Reviewed-by: Al Stone <[e-mail]>
---
 drivers/acpi/processor_driver.c |  6 ++++++
 include/acpi/processor.h        | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

Patch

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 16d44ad..6519c22 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);
 
@@ -291,6 +295,8 @@  static int acpi_processor_stop(struct device *dev)
 
 	acpi_pss_perf_exit(pr, device);
 
+	acpi_cppc_processor_exit(pr);
+
 	return 0;
 }
 
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 2c4e7a9..43ee1bf 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -314,6 +314,20 @@  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);
+extern void acpi_cppc_processor_exit(struct acpi_processor *pr);
+#else
+static inline int acpi_cppc_processor_probe(struct acpi_processor *pr)
+{
+	return 0;
+}
+static inline void acpi_cppc_processor_exit(struct acpi_processor *pr)
+{
+	return;
+}
+#endif	/* CONFIG_ACPI_CPPC_LIB */
+
 /* in processor_pdc.c */
 void acpi_processor_set_pdc(acpi_handle handle);