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 old style C-states(_CST)
This patch will help to extend the processor_idle module to support
LPI.
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
---
arch/ia64/Kconfig | 1 +
arch/x86/Kconfig | 1 +
drivers/acpi/Kconfig | 3 +++
drivers/acpi/processor_idle.c | 57 +++++++++++++++++++++++++++++++------------
include/acpi/processor.h | 3 ++-
5 files changed, 49 insertions(+), 16 deletions(-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index eb0249e37981..dbfa3c3a49e1 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 db3622f22b61..70cd310a447e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -34,6 +34,7 @@ config X86
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
+ select ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE if ACPI
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
select ARCH_SUPPORTS_INT128 if X86_64
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 25dbb76c02cc..12873f0b8141 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 fadce354d2b7..9ca840c88f48 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -59,6 +59,12 @@ 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);
@@ -804,11 +810,6 @@ 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
@@ -925,6 +926,41 @@ 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;
@@ -1018,20 +1054,11 @@ 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 6f1805dd5d3c..50f2423d31fa 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -242,7 +242,8 @@ 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
+#if defined(ARCH_HAS_POWER_INIT) && \
+ defined(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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