ACPI 6.0 adds a new method to specify the CPU idle states(c-states)
called Low Power Idle(LPI) states. Since new architectures like ARM64
use only LPIs, introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE to
encapsulate all the code supporting the traditional C-states.
This patch will help to extend the processor_idle module to support
LPI.
Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com>
---
arch/ia64/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/include/asm/acpi.h | 2 --
drivers/acpi/Kconfig | 3 +++
drivers/acpi/processor_idle.c | 57 +++++++++++++++++++++++++++++++------------
include/acpi/processor.h | 2 +-
6 files changed, 48 insertions(+), 18 deletions(-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 76d25b2cfbbe..6d7567efeecc 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -16,6 +16,7 @@ config IA64
select PCI if (!IA64_HP_SIM)
select ACPI if (!IA64_HP_SIM)
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
+ select ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE if ACPI
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_IDE
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 226d5696e1d1..b5d58c488409 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -23,6 +23,7 @@ config X86_64
config X86
def_bool y
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
+ select ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE if ACPI
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_FAST_MULTIPLIER
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 3a45668f6dc3..0077b318e3fa 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -138,8 +138,6 @@ static inline void disable_acpi(void) { }
#endif /* !CONFIG_ACPI */
-#define ARCH_HAS_POWER_INIT 1
-
#ifdef CONFIG_ACPI_NUMA
extern int acpi_numa;
extern int x86_acpi_numa_init(void);
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ab2cbb51c6aa..9d6885e07040 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -48,6 +48,9 @@ config ACPI_LEGACY_TABLES_LOOKUP
config ARCH_MIGHT_HAVE_ACPI_PDC
bool
+config ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
+ bool
+
config ACPI_GENERIC_GSI
bool
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 866179651dd9..55bd1fd21a6d 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -63,6 +63,12 @@ module_param(latency_factor, uint, 0644);
static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
+struct cpuidle_driver acpi_idle_driver = {
+ .name = "acpi_idle",
+ .owner = THIS_MODULE,
+};
+
+#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
static DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX],
acpi_cstate);
@@ -808,11 +814,6 @@ static void acpi_idle_enter_freeze(struct cpuidle_device
*dev,
acpi_idle_do_entry(cx);
}
-struct cpuidle_driver acpi_idle_driver = {
- .name = "acpi_idle",
- .owner = THIS_MODULE,
-};
-
/**
* acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE
* device i.e. per-cpu data
@@ -929,6 +930,41 @@ static int acpi_processor_setup_cpuidle_states(struct
acpi_processor *pr)
return 0;
}
+static inline void acpi_processor_cstate_first_run_checks(void)
+{
+ static int first_run;
+
+ if (first_run)
+ return;
+ dmi_check_system(processor_power_dmi_table);
+ max_cstate = acpi_processor_cstate_check(max_cstate);
+ if (max_cstate < ACPI_C_STATES_MAX)
+ pr_notice("ACPI: processor limited to max C-state %d\n",
+ max_cstate);
+ first_run++;
+}
+#else
+
+static inline int disabled_by_idle_boot_param(void) { return 0; }
+static inline void acpi_processor_cstate_first_run_checks(void) { }
+static int acpi_processor_get_power_info(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+
+static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
+ struct cpuidle_device *dev)
+{
+ return -EINVAL;
+}
+
+static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
+{
+ return -EINVAL;
+}
+
+#endif
+
int acpi_processor_hotplug(struct acpi_processor *pr)
{
int ret = 0;
@@ -1022,20 +1058,11 @@ int acpi_processor_power_init(struct acpi_processor *pr)
acpi_status status;
int retval;
struct cpuidle_device *dev;
- static int first_run;
if (disabled_by_idle_boot_param())
return 0;
- if (!first_run) {
- dmi_check_system(processor_power_dmi_table);
- max_cstate = acpi_processor_cstate_check(max_cstate);
- if (max_cstate < ACPI_C_STATES_MAX)
- printk(KERN_NOTICE
- "ACPI: processor limited to max C-state %d\n",
- max_cstate);
- first_run++;
- }
+ acpi_processor_cstate_first_run_checks();
if (acpi_gbl_FADT.cst_control && !nocst) {
status =
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index ffe675caa766..32d417d3df04 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -244,7 +244,7 @@ extern int acpi_processor_get_performance_info(struct
acpi_processor *pr);
DECLARE_PER_CPU(struct acpi_processor *, processors);
extern struct acpi_processor_errata errata;
-#ifdef ARCH_HAS_POWER_INIT
+#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
unsigned int cpu);
int acpi_processor_ffh_cstate_probe(unsigned int cpu,
--
1.9.1
--
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