The function arm_enter_idle_state is exactly the same in both generic
ARM{32,64} CPUIdle driver and will be the same even on ARM64 backend
for ACPI processor idle driver. So we can unify it and move it as
generic_cpuidle_enter by introducing HAVE_GENERIC_CPUIDLE_ENTER and
enabling the same on both ARM{32,64}.
This is in preparation of reuse of the generic cpuidle entry function
for ACPI LPI support on ARM64.
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
---
arch/arm/Kconfig | 1 +
arch/arm/kernel/cpuidle.c | 4 ++--
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/cpuidle.c | 6 +++---
drivers/cpuidle/Kconfig | 3 +++
drivers/cpuidle/cpuidle-arm.c | 21 +--------------------
drivers/cpuidle/cpuidle.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/cpuidle.h | 8 ++++++++
8 files changed, 54 insertions(+), 25 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90542db1220d..52b3dca0381c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -54,6 +54,7 @@ config ARM
select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
+ select HAVE_GENERIC_CPUIDLE_ENTER
select HAVE_GENERIC_DMA_COHERENT
select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
select HAVE_IDE if PCI || ISA || PCMCIA
diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
index a44b268e12e1..49704e333bfc 100644
--- a/arch/arm/kernel/cpuidle.c
+++ b/arch/arm/kernel/cpuidle.c
@@ -41,7 +41,7 @@ int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
}
/**
- * arm_cpuidle_suspend() - function to enter low power idle states
+ * cpuidle_generic_enter() - function to enter low power idle states
* @index: an integer used as an identifier for the low level PM callbacks
*
* This function calls the underlying arch specific low level PM code as
@@ -50,7 +50,7 @@ int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
* Returns -EOPNOTSUPP if no suspend callback is defined, the result of the
* callback otherwise.
*/
-int arm_cpuidle_suspend(int index)
+int cpuidle_generic_enter(int index)
{
int ret = -EOPNOTSUPP;
int cpu = smp_processor_id();
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5a0a691d4220..0916b6e6c8ef 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -76,6 +76,7 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
+ select HAVE_GENERIC_CPUIDLE_ENTER
select HAVE_GENERIC_DMA_COHERENT
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_IRQ_TIME_ACCOUNTING
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index 06786fdaadeb..bade1b04ff12 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -9,10 +9,10 @@
* published by the Free Software Foundation.
*/
+#include <linux/cpuidle.h>
#include <linux/of.h>
#include <linux/of_device.h>
-#include <asm/cpuidle.h>
#include <asm/cpu_ops.h>
int arm_cpuidle_init(unsigned int cpu)
@@ -27,13 +27,13 @@ int arm_cpuidle_init(unsigned int cpu)
}
/**
- * cpu_suspend() - function to enter a low-power idle state
+ * cpuidle_generic_enter() - function to enter a low-power idle state
* @arg: argument to pass to CPU suspend operations
*
* Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
* operations back-end error code otherwise.
*/
-int arm_cpuidle_suspend(int index)
+int cpuidle_generic_enter(int index)
{
int cpu = smp_processor_id();
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index 7e48eb5bf0a7..e557289cff90 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -45,4 +45,7 @@ endif
config ARCH_NEEDS_CPU_IDLE_COUPLED
def_bool n
+
+config HAVE_GENERIC_CPUIDLE_ENTER
+ def_bool n
endmenu
diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index e342565e8715..13012d8eba53 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -36,26 +36,7 @@
static int arm_enter_idle_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
- int ret;
-
- if (!idx) {
- cpu_do_idle();
- return idx;
- }
-
- ret = cpu_pm_enter();
- if (!ret) {
- /*
- * Pass idle state index to cpu_suspend which in turn will
- * call the CPU ops suspend protocol with idle index as a
- * parameter.
- */
- ret = arm_cpuidle_suspend(idx);
-
- cpu_pm_exit();
- }
-
- return ret ? -1 : idx;
+ return cpuidle_generic_enter_state(idx);
}
static struct cpuidle_driver arm_idle_driver = {
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index a4d0059e232c..e490dea98b89 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -16,6 +16,7 @@
#include <linux/pm_qos.h>
#include <linux/cpu.h>
#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/module.h>
@@ -255,6 +256,40 @@ int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
}
/**
+ * cpuidle_generic_enter_state - enter into the specified idle state using the
+ * generic callback if implemented
+ *
+ * @index: the index in the idle state table
+ *
+ * Returns the index in the idle state, -1 in case of error.
+ */
+int cpuidle_generic_enter_state(int idx)
+{
+ int ret;
+
+ if (!idx) {
+ cpu_do_idle();
+ return idx;
+ }
+
+ ret = cpu_pm_enter();
+ if (!ret) {
+ /*
+ * Pass idle state index to cpu_suspend which in turn will
+ * call the CPU ops suspend protocol with idle index as a
+ * parameter.
+ */
+ ret = cpuidle_generic_enter(idx);
+
+ cpu_pm_exit();
+ }
+
+ return ret ? -1 : idx;
+}
+
+EXPORT_SYMBOL_GPL(cpuidle_generic_enter_state);
+
+/**
* cpuidle_enter - enter into the specified idle state
*
* @drv: the cpuidle driver tied with the cpu
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 07b83d32f66c..9fd3c10166fa 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -154,6 +154,7 @@ extern int cpuidle_play_dead(void);
extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
static inline struct cpuidle_device *cpuidle_get_device(void)
{return __this_cpu_read(cpuidle_devices); }
+extern int cpuidle_generic_enter_state(int idx);
#else
static inline void disable_cpuidle(void) { }
static inline bool cpuidle_not_available(struct cpuidle_driver *drv,
@@ -190,6 +191,7 @@ static inline int cpuidle_play_dead(void) {return -ENODEV; }
static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
struct cpuidle_device *dev) {return NULL; }
static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; }
+static inline int cpuidle_generic_enter_state(int idx) { return -1; }
#endif
#if defined(CONFIG_CPU_IDLE) && defined(CONFIG_SUSPEND)
@@ -246,6 +248,12 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
{return 0;}
#endif
+#ifdef CONFIG_HAVE_GENERIC_CPUIDLE_ENTER
+extern int cpuidle_generic_enter(int idx);
+#else
+static inline int cpuidle_generic_enter(int idx) { return -1; }
+#endif
+
#ifdef CONFIG_ARCH_HAS_CPU_RELAX
#define CPUIDLE_DRIVER_STATE_START 1
#else
--
2.7.4
--
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