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authorAshwin Chaugule <ashwin.chaugule@linaro.org>2015-08-05 09:40:26 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-08-25 03:25:47 +0200
commit5f05586c609dfc737e2e00c757a51c7dbb415e51 (patch)
tree282d1717e70ad141d994d87589006d78d22c5006
parent239708a3af44064366f1af0eea02dc1e8991c11b (diff)
ACPI: Decouple ACPI idle and ACPI processor drivers
This patch introduces a new Kconfig symbol, ACPI_PROCESSOR_IDLE, which is auto selected by architectures which support the ACPI based C states for CPU Idle management. The processor_idle driver in its present form contains declarations specific to X86 and IA64. Since there are no reasonable defaults for other architectures e.g. ARM64, the driver is selected only for X86 or IA64. This helps in decoupling the ACPI processor_driver from the ACPI processor_idle driver which is useful for the upcoming alternative patchwork for controlling CPU Performance (CPPC) and CPU Idle (LPI). Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/acpi/Kconfig6
-rw-r--r--drivers/acpi/Makefile3
-rw-r--r--include/acpi/processor.h26
3 files changed, 31 insertions, 4 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index d6e2a869033c..54e9729f9634 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -193,10 +193,14 @@ config ACPI_CPU_FREQ_PSS
bool
select THERMAL
+config ACPI_PROCESSOR_IDLE
+ bool
+ select CPU_IDLE
+
config ACPI_PROCESSOR
tristate "Processor"
depends on X86 || IA64
- select CPU_IDLE
+ select ACPI_PROCESSOR_IDLE
select ACPI_CPU_FREQ_PSS
default y
help
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 7e97aef373ae..3ea59ae85c19 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -80,7 +80,8 @@ obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
obj-$(CONFIG_ACPI_BGRT) += bgrt.o
# processor has its own "processor." module_param namespace
-processor-y := processor_driver.o processor_idle.o
+processor-y := processor_driver.o
+processor-$(CONFIG_ACPI_PROCESSOR_IDLE) += processor_idle.o
processor-$(CONFIG_ACPI_CPU_FREQ_PSS) += processor_throttling.o \
processor_thermal.o
processor-$(CONFIG_CPU_FREQ) += processor_perflib.o
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index b6c917835805..2c4e7a9c1725 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -355,13 +355,35 @@ static inline void acpi_processor_throttling_init(void) {}
#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
/* in processor_idle.c */
+extern struct cpuidle_driver acpi_idle_driver;
+#ifdef CONFIG_ACPI_PROCESSOR_IDLE
int acpi_processor_power_init(struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr);
int acpi_processor_cst_has_changed(struct acpi_processor *pr);
int acpi_processor_hotplug(struct acpi_processor *pr);
-extern struct cpuidle_driver acpi_idle_driver;
+#else
+static inline int acpi_processor_power_init(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+
+static inline int acpi_processor_power_exit(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+
+static inline int acpi_processor_cst_has_changed(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+
+static inline int acpi_processor_hotplug(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_ACPI_PROCESSOR_IDLE */
-#ifdef CONFIG_PM_SLEEP
+#if defined(CONFIG_PM_SLEEP) & defined(CONFIG_ACPI_PROCESSOR_IDLE)
void acpi_processor_syscore_init(void);
void acpi_processor_syscore_exit(void);
#else

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