[PATCH v5 1/9] cpuidle: Add commonly used functionality for consolidation

Add functionality that is commonly duplicated by various platforms.

Signed-off-by: Robert Lee <redacted>
---
?drivers/cpuidle/cpuidle.c | ? 37 ++++++++++++++++++------------
?include/linux/cpuidle.h ? | ? 55 +++++++++++++++++++++++++++++++++++++++++++++
?2 files changed, 77 insertions(+), 15 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 712abcc..6563683 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h

@@ -15,6 +15,7 @@

?#include <linux/list.h>
?#include <linux/kobject.h>
?#include <linux/completion.h>
+#include <linux/hrtimer.h>

?#define CPUIDLE_STATE_MAX ? ? ?8
?#define CPUIDLE_NAME_LEN ? ? ? 16

@@ -56,6 +57,16 @@ struct cpuidle_state {

?#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)

+/* Common ARM WFI state */
+#define CPUIDLE_ARM_WFI_STATE {\
+ ? ? ? .enter ? ? ? ? ? ? ? ? ?= cpuidle_simple_enter,\
+ ? ? ? .exit_latency ? ? ? ? ? = 1,\
+ ? ? ? .target_residency ? ? ? = 1,\
+ ? ? ? .flags ? ? ? ? ? ? ? ? ?= CPUIDLE_FLAG_TIME_VALID,\
+ ? ? ? .name ? ? ? ? ? ? ? ? ? = "WFI",\
+ ? ? ? .desc ? ? ? ? ? ? ? ? ? = "ARM core clock gating (WFI)",\
+}

+
?/**
?* cpuidle_get_statedata - retrieves private driver state data
?* @st_usage: the state usage statistics

@@ -122,6 +133,14 @@ struct cpuidle_driver {

? ? ? ?struct module ? ? ? ? ? *owner;

? ? ? ?unsigned int ? ? ? ? ? ?power_specified:1;
+ ? ? ? /*
+ ? ? ? ?* use the core cpuidle time keeping. This has been implemented for the
+ ? ? ? ?* entire driver instead of per state as currently the device enter
+ ? ? ? ?* fuction allows the entered state to change which requires handling
+ ? ? ? ?* that requires a (subjectively) unnecessary decrease to efficiency
+ ? ? ? ?* in this commonly called code.
+ ? ? ? ?*/
+ ? ? ? unsigned int ? ? ? ? ? ?en_core_tk_irqen:1;

? ? ? ?struct cpuidle_state ? ?states[CPUIDLE_STATE_MAX];
? ? ? ?int ? ? ? ? ? ? ? ? ? ? state_count;
? ? ? ?int ? ? ? ? ? ? ? ? ? ? safe_state_index;

@@ -140,6 +159,39 @@ extern void cpuidle_pause_and_lock(void);

?extern void cpuidle_resume_and_unlock(void);
?extern int cpuidle_enable_device(struct cpuidle_device *dev);
?extern void cpuidle_disable_device(struct cpuidle_device *dev);
+extern int cpuidle_simple_enter(struct cpuidle_device *dev,
+ ? ? ? ? ? ? ? struct cpuidle_driver *drv, int index);
+
+/**
+ * cpuidle_enter_wrap - performing timekeeping and irq around enter function
+ * @dev: pointer to a valid cpuidle_device object
+ * @drv: pointer to a valid cpuidle_driver object
+ * @index: index of the target cpuidle state.
+ */
+static inline int cpuidle_wrap_enter(struct cpuidle_device *dev,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct cpuidle_driver *drv, int index,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? int (*enter)(struct cpuidle_device *dev,
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct cpuidle_driver *drv, int index))