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| author | Sudeep Holla <Sudeep.Holla@arm.com> | 2016-07-21 19:18:07 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-07-22 00:25:58 +0300 |
| commit | a36a7fecfe6071732075ad5aa31196adce13181b (patch) | |
| tree | e3d88c1b278e013b10bd1280dc0257d5b23cba3c /include/acpi | |
| parent | 35ae713355868aa493edbfbabf615473473215cc (diff) | |
| download | linux-a36a7fecfe6071732075ad5aa31196adce13181b.tar.xz | |
ACPI / processor_idle: Add support for Low Power Idle(LPI) states
ACPI 6.0 introduced an optional object _LPI that provides an alternate
method to describe Low Power Idle states. It defines the local power
states for each node in a hierarchical processor topology. The OSPM can
use _LPI object to select a local power state for each level of processor
hierarchy in the system. They used to produce a composite power state
request that is presented to the platform by the OSPM.
Since multiple processors affect the idle state for any non-leaf hierarchy
node, coordination of idle state requests between the processors is
required. ACPI supports two different coordination schemes: Platform
coordinated and OS initiated.
This patch adds initial support for Platform coordination scheme of LPI.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/processor.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 48779d678122..e2dcb0c51554 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -39,6 +39,7 @@ #define ACPI_CSTATE_SYSTEMIO 0 #define ACPI_CSTATE_FFH 1 #define ACPI_CSTATE_HALT 2 +#define ACPI_CSTATE_INTEGER 3 #define ACPI_CX_DESC_LEN 32 @@ -67,9 +68,25 @@ struct acpi_processor_cx { char desc[ACPI_CX_DESC_LEN]; }; +struct acpi_lpi_state { + u32 min_residency; + u32 wake_latency; /* worst case */ + u32 flags; + u32 arch_flags; + u32 res_cnt_freq; + u32 enable_parent_state; + u64 address; + u8 index; + u8 entry_method; + char desc[ACPI_CX_DESC_LEN]; +}; + struct acpi_processor_power { int count; - struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER]; + union { + struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER]; + struct acpi_lpi_state lpi_states[ACPI_PROCESSOR_MAX_POWER]; + }; int timer_broadcast_on_state; }; @@ -189,6 +206,7 @@ struct acpi_processor_flags { u8 bm_control:1; u8 bm_check:1; u8 has_cst:1; + u8 has_lpi:1; u8 power_setup_done:1; u8 bm_rld_set:1; u8 need_hotplug_init:1; @@ -371,7 +389,7 @@ 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_power_state_has_changed(struct acpi_processor *pr); int acpi_processor_hotplug(struct acpi_processor *pr); #else static inline int acpi_processor_power_init(struct acpi_processor *pr) @@ -384,7 +402,7 @@ 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) +static inline int acpi_processor_power_state_has_changed(struct acpi_processor *pr) { return -ENODEV; } |