Commit a36a7fec authored by Sudeep Holla's avatar Sudeep Holla Committed by Rafael J. Wysocki

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: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 35ae7133
...@@ -302,6 +302,14 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) ...@@ -302,6 +302,14 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
EXPORT_SYMBOL(acpi_run_osc); EXPORT_SYMBOL(acpi_run_osc);
bool osc_sb_apei_support_acked; bool osc_sb_apei_support_acked;
/*
* ACPI 6.0 Section 8.4.4.2 Idle State Coordination
* OSPM supports platform coordinated low power idle(LPI) states
*/
bool osc_pc_lpi_support_confirmed;
EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void) static void acpi_bus_osc_support(void)
{ {
...@@ -322,6 +330,7 @@ static void acpi_bus_osc_support(void) ...@@ -322,6 +330,7 @@ static void acpi_bus_osc_support(void)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
if (!ghes_disable) if (!ghes_disable)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
...@@ -329,9 +338,12 @@ static void acpi_bus_osc_support(void) ...@@ -329,9 +338,12 @@ static void acpi_bus_osc_support(void)
return; return;
if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
u32 *capbuf_ret = context.ret.pointer; u32 *capbuf_ret = context.ret.pointer;
if (context.ret.length > OSC_SUPPORT_DWORD) if (context.ret.length > OSC_SUPPORT_DWORD) {
osc_sb_apei_support_acked = osc_sb_apei_support_acked =
capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
osc_pc_lpi_support_confirmed =
capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
}
kfree(context.ret.pointer); kfree(context.ret.pointer);
} }
/* do we need to check other returned cap? Sounds no */ /* do we need to check other returned cap? Sounds no */
......
...@@ -90,7 +90,7 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) ...@@ -90,7 +90,7 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
pr->performance_platform_limit); pr->performance_platform_limit);
break; break;
case ACPI_PROCESSOR_NOTIFY_POWER: case ACPI_PROCESSOR_NOTIFY_POWER:
acpi_processor_cst_has_changed(pr); acpi_processor_power_state_has_changed(pr);
acpi_bus_generate_netlink_event(device->pnp.device_class, acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0); dev_name(&device->dev), event, 0);
break; break;
......
This diff is collapsed.
...@@ -39,6 +39,7 @@ ...@@ -39,6 +39,7 @@
#define ACPI_CSTATE_SYSTEMIO 0 #define ACPI_CSTATE_SYSTEMIO 0
#define ACPI_CSTATE_FFH 1 #define ACPI_CSTATE_FFH 1
#define ACPI_CSTATE_HALT 2 #define ACPI_CSTATE_HALT 2
#define ACPI_CSTATE_INTEGER 3
#define ACPI_CX_DESC_LEN 32 #define ACPI_CX_DESC_LEN 32
...@@ -67,9 +68,25 @@ struct acpi_processor_cx { ...@@ -67,9 +68,25 @@ struct acpi_processor_cx {
char desc[ACPI_CX_DESC_LEN]; 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 { struct acpi_processor_power {
int count; 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; int timer_broadcast_on_state;
}; };
...@@ -189,6 +206,7 @@ struct acpi_processor_flags { ...@@ -189,6 +206,7 @@ struct acpi_processor_flags {
u8 bm_control:1; u8 bm_control:1;
u8 bm_check:1; u8 bm_check:1;
u8 has_cst:1; u8 has_cst:1;
u8 has_lpi:1;
u8 power_setup_done:1; u8 power_setup_done:1;
u8 bm_rld_set:1; u8 bm_rld_set:1;
u8 need_hotplug_init:1; u8 need_hotplug_init:1;
...@@ -371,7 +389,7 @@ extern struct cpuidle_driver acpi_idle_driver; ...@@ -371,7 +389,7 @@ extern struct cpuidle_driver acpi_idle_driver;
#ifdef CONFIG_ACPI_PROCESSOR_IDLE #ifdef CONFIG_ACPI_PROCESSOR_IDLE
int acpi_processor_power_init(struct acpi_processor *pr); int acpi_processor_power_init(struct acpi_processor *pr);
int acpi_processor_power_exit(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); int acpi_processor_hotplug(struct acpi_processor *pr);
#else #else
static inline int acpi_processor_power_init(struct acpi_processor *pr) 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) ...@@ -384,7 +402,7 @@ static inline int acpi_processor_power_exit(struct acpi_processor *pr)
return -ENODEV; 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; return -ENODEV;
} }
......
...@@ -444,8 +444,12 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context); ...@@ -444,8 +444,12 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
#define OSC_SB_HOTPLUG_OST_SUPPORT 0x00000008 #define OSC_SB_HOTPLUG_OST_SUPPORT 0x00000008
#define OSC_SB_APEI_SUPPORT 0x00000010 #define OSC_SB_APEI_SUPPORT 0x00000010
#define OSC_SB_CPC_SUPPORT 0x00000020 #define OSC_SB_CPC_SUPPORT 0x00000020
#define OSC_SB_CPCV2_SUPPORT 0x00000040
#define OSC_SB_PCLPI_SUPPORT 0x00000080
#define OSC_SB_OSLPI_SUPPORT 0x00000100
extern bool osc_sb_apei_support_acked; extern bool osc_sb_apei_support_acked;
extern bool osc_pc_lpi_support_confirmed;
/* PCI Host Bridge _OSC: Capabilities DWORD 2: Support Field */ /* PCI Host Bridge _OSC: Capabilities DWORD 2: Support Field */
#define OSC_PCI_EXT_CONFIG_SUPPORT 0x00000001 #define OSC_PCI_EXT_CONFIG_SUPPORT 0x00000001
......
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