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Subject[PATCH v4 2/5] ACPI / processor_idle: Add support for Low Power Idle(LPI) states
Date
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.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/acpi/bus.c | 11 +-
drivers/acpi/processor_driver.c | 2 +-
drivers/acpi/processor_idle.c | 441 +++++++++++++++++++++++++++++++++++-----
include/acpi/processor.h | 25 ++-
include/linux/acpi.h | 4 +
5 files changed, 422 insertions(+), 61 deletions(-)

Hi Rafael,

Yet to be discussed(retained as in from previous version):
- Kconfig entry removal: Need feedback on how to deal with that
without having to introduce dummy _CST related ARM64 callbacks
- Didn't defer processing of LPI buffers to flattening as it
results in the same buffer decoded multiple times
- ACPI_CSTATE_INTEGER : IMO it's reasonable to keep it aroundsince the
it's part of LPI specification(not just ARM FFH)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index c068c829b453..94fe6e0ccfd3 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -302,6 +302,11 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
EXPORT_SYMBOL(acpi_run_osc);

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;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
{
@@ -322,6 +327,7 @@ static void acpi_bus_osc_support(void)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;

capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;

if (!ghes_disable)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
@@ -329,9 +335,12 @@ static void acpi_bus_osc_support(void)
return;
if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
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 =
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);
}
/* do we need to check other returned cap? Sounds no */
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index d2fa8cb82d2b..0ca14ac7bb28 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -90,7 +90,7 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
pr->performance_platform_limit);
break;
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,
dev_name(&device->dev), event, 0);
break;
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 1f3fe54194b5..5c78d68c7311 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -303,7 +303,6 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *cst;

-
if (nocst)
return -ENODEV;

@@ -576,7 +575,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
return (working);
}

-static int acpi_processor_get_power_info(struct acpi_processor *pr)
+static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
{
unsigned int i;
int result;
@@ -810,31 +809,12 @@ static void acpi_idle_enter_freeze(struct cpuidle_device *dev,
acpi_idle_do_entry(cx);
}

-/**
- * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE
- * device i.e. per-cpu data
- *
- * @pr: the ACPI processor
- * @dev : the cpuidle device
- */
static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
struct cpuidle_device *dev)
{
int i, count = CPUIDLE_DRIVER_STATE_START;
struct acpi_processor_cx *cx;

- if (!pr->flags.power_setup_done)
- return -EINVAL;
-
- if (pr->flags.power == 0) {
- return -EINVAL;
- }
-
- if (!dev)
- return -EINVAL;
-
- dev->cpu = pr->id;
-
if (max_cstate == 0)
max_cstate = 1;

@@ -857,31 +837,13 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
return 0;
}

-/**
- * acpi_processor_setup_cpuidle states- prepares and configures cpuidle
- * global state data i.e. idle routines
- *
- * @pr: the ACPI processor
- */
-static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
+static int acpi_processor_setup_cstates(struct acpi_processor *pr)
{
int i, count = CPUIDLE_DRIVER_STATE_START;
struct acpi_processor_cx *cx;
struct cpuidle_state *state;
struct cpuidle_driver *drv = &acpi_idle_driver;

- if (!pr->flags.power_setup_done)
- return -EINVAL;
-
- if (pr->flags.power == 0)
- return -EINVAL;
-
- drv->safe_state_index = -1;
- for (i = CPUIDLE_DRIVER_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
- drv->states[i].name[0] = '\0';
- drv->states[i].desc[0] = '\0';
- }
-
if (max_cstate == 0)
max_cstate = 1;

@@ -893,7 +855,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)

state = &drv->states[count];
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
- strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
+ strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
state->exit_latency = cx->latency;
state->target_residency = cx->latency * latency_factor;
state->enter = acpi_idle_enter;
@@ -929,6 +891,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
static inline void acpi_processor_cstate_first_run_checks(void)
{
static int first_run;
+ acpi_status status;

if (first_run)
return;
@@ -951,7 +914,7 @@ static inline void acpi_processor_cstate_first_run_checks(void)

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)
+static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
{
return -ENODEV;
}
@@ -962,13 +925,386 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
return -EINVAL;
}

-static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
+static int acpi_processor_setup_cstates(struct acpi_processor *pr)
{
return -EINVAL;
}

#endif

+struct acpi_processor_lpi_info {
+ int state_count;
+ struct acpi_processor_lpi *lpix;
+};
+
+static int obj_get_integer(union acpi_object *obj, u32 *value)
+{
+ if (obj->type != ACPI_TYPE_INTEGER)
+ return -EINVAL;
+ *value = obj->integer.value;
+ return 0;
+}
+
+static int acpi_processor_evaluate_lpi(acpi_handle handle,
+ struct acpi_processor_lpi_info *info)
+{
+ acpi_status status = 0;
+ int ret = 0;
+ int pkg_count, state_idx = 1, loop;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *lpi;
+ struct acpi_processor_lpi *lpix;
+
+ status = acpi_evaluate_object(handle, "_LPI", NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _LPI, giving up\n"));
+ return -ENODEV;
+ }
+
+ lpi = buffer.pointer;
+
+ /* There must be at least 4 elements = 3 elements + 1 package */
+ if (!lpi || lpi->type != ACPI_TYPE_PACKAGE || lpi->package.count < 4) {
+ pr_debug("not enough elements in _LPI\n");
+ ret = -ENXIO;
+ goto end;
+ }
+
+ pkg_count = lpi->package.elements[2].integer.value;
+
+ /* Validate number of power states. */
+ if (pkg_count < 1 || pkg_count != lpi->package.count - 3) {
+ pr_debug("count given by _LPI is not valid\n");
+ ret = -ENXIO;
+ goto end;
+ }
+
+ lpix = kcalloc(pkg_count, sizeof(*lpix), GFP_KERNEL);
+ if (!lpix) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ info->state_count = pkg_count;
+ info->lpix = lpix;
+ /* LPI States start at index 3 */
+ for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, lpix++) {
+ union acpi_object *element, *pkg_elem, *obj;
+
+ element = &lpi->package.elements[loop];
+ if (element->type != ACPI_TYPE_PACKAGE)
+ continue;
+
+ if (element->package.count < 7)
+ continue;
+
+ pkg_elem = element->package.elements;
+
+ obj = pkg_elem + 6;
+ if (obj->type == ACPI_TYPE_BUFFER) {
+ struct acpi_power_register *reg;
+
+ reg = (struct acpi_power_register *)obj->buffer.pointer;
+ if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
+ (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
+ continue;
+ lpix->address = reg->address;
+ if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE)
+ lpix->entry_method = ACPI_CSTATE_FFH;
+ else
+ lpix->entry_method = ACPI_CSTATE_SYSTEMIO;
+ } else if (obj->type == ACPI_TYPE_INTEGER) {
+ lpix->entry_method = ACPI_CSTATE_INTEGER;
+ lpix->address = obj->integer.value;
+ } else {
+ continue;
+ }
+
+ /* elements[7,8] skipped for now i.e. Residency/Usage counter*/
+
+ obj = pkg_elem + 9;
+ if (obj->type == ACPI_TYPE_STRING)
+ strlcpy(lpix->desc, obj->string.pointer,
+ ACPI_CX_DESC_LEN);
+
+ lpix->index = state_idx;
+ if (obj_get_integer(pkg_elem + 0, &lpix->min_residency)) {
+ pr_debug("No min. residency found, assuming 10 us\n");
+ lpix->min_residency = 10;
+ }
+
+ if (obj_get_integer(pkg_elem + 1, &lpix->wake_latency)) {
+ pr_debug("No wakeup residency found, assuming 10 us\n");
+ lpix->wake_latency = 10;
+ }
+
+ if (obj_get_integer(pkg_elem + 2, &lpix->flags))
+ lpix->flags = 0;
+
+ if (obj_get_integer(pkg_elem + 3, &lpix->arch_flags))
+ lpix->arch_flags = 0;
+
+ if (obj_get_integer(pkg_elem + 4, &lpix->res_cnt_freq))
+ lpix->res_cnt_freq = 1;
+
+ if (obj_get_integer(pkg_elem + 5, &lpix->enable_parent_state))
+ lpix->enable_parent_state = 0;
+ }
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
+ state_idx));
+end:
+ kfree(buffer.pointer);
+ return ret;
+}
+
+static int max_leaf_depth, fl_scnt;
+/**
+ * combine_lpi_states - combine local and parent LPI states to form a
+ * composite LPI state
+ * @l_lpi: local LPI state
+ * @p_lpi: parent LPI state
+ * @c_lpi: composite LPI state
+ */
+static void combine_lpi_states(struct acpi_processor_lpi *l_lpi,
+ struct acpi_processor_lpi *p_lpi,
+ struct acpi_processor_lpi *c_lpi)
+{
+ c_lpi->min_residency = max(l_lpi->min_residency, p_lpi->min_residency);
+ c_lpi->wake_latency = l_lpi->wake_latency + p_lpi->wake_latency;
+ c_lpi->enable_parent_state = p_lpi->enable_parent_state;
+ c_lpi->entry_method = l_lpi->entry_method;
+
+ if (p_lpi->entry_method == ACPI_CSTATE_INTEGER)
+ c_lpi->address = l_lpi->address + p_lpi->address;
+ else
+ c_lpi->address = p_lpi->address;
+
+ c_lpi->index = p_lpi->index;
+ c_lpi->flags = p_lpi->flags;
+ c_lpi->arch_flags = p_lpi->arch_flags;
+
+ strlcpy(c_lpi->desc, l_lpi->desc, ACPI_CX_DESC_LEN);
+ strlcat(c_lpi->desc, "+", ACPI_CX_DESC_LEN);
+ strlcat(c_lpi->desc, p_lpi->desc, ACPI_CX_DESC_LEN);
+}
+
+#define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0)
+
+static int flatten_lpi_states(struct acpi_processor *pr,
+ struct acpi_processor_lpi_info *info,
+ struct acpi_processor_lpi *lpi,
+ uint32_t depth)
+{
+ int j, scount = info[depth].state_count;
+ struct acpi_processor_lpi *t = info[depth].lpix;
+
+ for (j = 0; j < scount; j++, t++) {
+ struct acpi_processor_lpi *flpi;
+ bool valid = false;
+
+ if (!(t->flags & ACPI_LPI_STATE_FLAGS_ENABLED))
+ continue;
+
+ flpi = &pr->power.lpi_states[fl_scnt];
+ if (depth == max_leaf_depth) { /* leaf/processor node */
+ memcpy(flpi, t, sizeof(*t));
+ fl_scnt++;
+ valid = true;
+ } else if (lpi && t->index <= lpi->enable_parent_state) {
+ combine_lpi_states(lpi, t, flpi);
+ fl_scnt++;
+ valid = true;
+ }
+
+ /*
+ * flatten recursively from leaf until the highest level
+ * (e.g. system) is reached
+ */
+ if (valid && depth)
+ flatten_lpi_states(pr, info, flpi, depth - 1);
+ }
+ return 0;
+}
+
+static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
+{
+ int ret, i;
+ struct acpi_processor_lpi_info *info;
+ struct acpi_device *d = NULL;
+ acpi_handle handle = pr->handle, pr_ahandle;
+ acpi_status status;
+
+ if (!osc_pc_lpi_support_confirmed)
+ return -EOPNOTSUPP;
+
+ max_leaf_depth = 0;
+ if (!acpi_has_method(handle, "_LPI"))
+ return -EINVAL;
+ fl_scnt = 0;
+
+ while (ACPI_SUCCESS(status = acpi_get_parent(handle, &pr_ahandle))) {
+ if (!acpi_has_method(handle, "_LPI"))
+ continue;
+ acpi_bus_get_device(handle, &d);
+ if (!strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
+ break;
+ max_leaf_depth++;
+ handle = pr_ahandle;
+ }
+
+ info = kcalloc(max_leaf_depth + 1, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ pr_ahandle = pr->handle;
+ for (i = max_leaf_depth; i >= 0 && ACPI_SUCCESS(status); i--) {
+ handle = pr_ahandle;
+ ret = acpi_processor_evaluate_lpi(handle, info + i);
+ if (ret)
+ break;
+ status = acpi_get_parent(handle, &pr_ahandle);
+ }
+
+ /* flatten all the LPI states in the entire hierarchy */
+ flatten_lpi_states(pr, info, NULL, max_leaf_depth);
+
+ pr->power.count = fl_scnt;
+ for (i = 0; i <= max_leaf_depth; i++)
+ kfree(info[i].lpix);
+ kfree(info);
+
+ /* Tell driver that _LPI is supported. */
+ pr->flags.has_lpi = 1;
+ pr->flags.power = 1;
+
+ return 0;
+}
+
+int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
+{
+ return -ENODEV;
+}
+
+int __weak acpi_processor_ffh_lpi_enter(struct acpi_processor_lpi *lpi, int idx)
+{
+ return -ENODEV;
+}
+
+/**
+ * acpi_idle_lpi_enter - enters an ACPI any LPI state
+ * @dev: the target CPU
+ * @drv: cpuidle driver containing cpuidle state info
+ * @index: index of target state
+ *
+ * Return: 0 for success or negative value for error
+ */
+static int acpi_idle_lpi_enter(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ struct acpi_processor *pr;
+ struct acpi_processor_lpi *lpi;
+
+ pr = __this_cpu_read(processors);
+
+ if (unlikely(!pr))
+ return -EINVAL;
+
+ lpi = &pr->power.lpi_states[index];
+ if (lpi->entry_method == ACPI_CSTATE_FFH)
+ /* Call into architectural FFH based C-state */
+ return acpi_processor_ffh_lpi_enter(lpi, index);
+ return -EINVAL;
+}
+
+static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
+{
+ int i;
+ struct acpi_processor_lpi *lpi;
+ struct cpuidle_state *state;
+ struct cpuidle_driver *drv = &acpi_idle_driver;
+
+ if (!pr->flags.has_lpi)
+ return -EOPNOTSUPP;
+
+ for (i = 0; i < fl_scnt && i < CPUIDLE_STATE_MAX; i++) {
+ lpi = &pr->power.lpi_states[i];
+
+ state = &drv->states[i];
+ snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
+ strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
+ state->exit_latency = lpi->wake_latency;
+ state->target_residency = lpi->min_residency;
+ if (lpi->arch_flags)
+ state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+ state->enter = acpi_idle_lpi_enter;
+ drv->safe_state_index = i;
+ }
+
+ drv->state_count = i;
+
+ return 0;
+}
+
+/**
+ * acpi_processor_setup_cpuidle_states- prepares and configures cpuidle
+ * global state data i.e. idle routines
+ *
+ * @pr: the ACPI processor
+ */
+static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
+{
+ int i;
+ struct cpuidle_driver *drv = &acpi_idle_driver;
+
+ if (!pr->flags.power_setup_done)
+ return -EINVAL;
+
+ if (pr->flags.power == 0)
+ return -EINVAL;
+
+ drv->safe_state_index = -1;
+ for (i = CPUIDLE_DRIVER_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
+ drv->states[i].name[0] = '\0';
+ drv->states[i].desc[0] = '\0';
+ }
+
+ if (pr->flags.has_lpi)
+ return acpi_processor_setup_lpi_states(pr);
+ return acpi_processor_setup_cstates(pr);
+}
+
+/**
+ * acpi_processor_setup_cpuidle_dev - prepares and configures CPUIDLE
+ * device i.e. per-cpu data
+ *
+ * @pr: the ACPI processor
+ * @dev : the cpuidle device
+ */
+static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr,
+ struct cpuidle_device *dev)
+{
+ if (!pr->flags.power_setup_done)
+ return -EINVAL;
+
+ if (pr->flags.power == 0)
+ return -EINVAL;
+
+ if (!dev)
+ return -EINVAL;
+
+ dev->cpu = pr->id;
+ if (pr->flags.has_lpi)
+ return acpi_processor_ffh_lpi_probe(pr->id);
+ return acpi_processor_setup_cpuidle_cx(pr, dev);
+}
+
+static int acpi_processor_get_power_info(struct acpi_processor *pr)
+{
+ if (acpi_processor_get_lpi_info(pr))
+ return acpi_processor_get_cstate_info(pr);
+ return 0;
+}
+
int acpi_processor_hotplug(struct acpi_processor *pr)
{
int ret = 0;
@@ -977,18 +1313,15 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
if (disabled_by_idle_boot_param())
return 0;

- if (nocst)
- return -ENODEV;
-
if (!pr->flags.power_setup_done)
return -ENODEV;

dev = per_cpu(acpi_cpuidle_device, pr->id);
cpuidle_pause_and_lock();
cpuidle_disable_device(dev);
- acpi_processor_get_power_info(pr);
- if (pr->flags.power) {
- acpi_processor_setup_cpuidle_cx(pr, dev);
+ ret = acpi_processor_get_power_info(pr);
+ if (!ret && pr->flags.power) {
+ acpi_processor_setup_cpuidle_dev(pr, dev);
ret = cpuidle_enable_device(dev);
}
cpuidle_resume_and_unlock();
@@ -996,7 +1329,7 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
return ret;
}

-int acpi_processor_cst_has_changed(struct acpi_processor *pr)
+int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
{
int cpu;
struct acpi_processor *_pr;
@@ -1005,9 +1338,6 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
if (disabled_by_idle_boot_param())
return 0;

- if (nocst)
- return -ENODEV;
-
if (!pr->flags.power_setup_done)
return -ENODEV;

@@ -1044,7 +1374,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
acpi_processor_get_power_info(_pr);
if (_pr->flags.power) {
dev = per_cpu(acpi_cpuidle_device, cpu);
- acpi_processor_setup_cpuidle_cx(_pr, dev);
+ acpi_processor_setup_cpuidle_dev(_pr, dev);
cpuidle_enable_device(dev);
}
}
@@ -1059,7 +1389,6 @@ static int acpi_processor_registered;

int acpi_processor_power_init(struct acpi_processor *pr)
{
- acpi_status status;
int retval;
struct cpuidle_device *dev;

@@ -1092,7 +1421,7 @@ int acpi_processor_power_init(struct acpi_processor *pr)
return -ENOMEM;
per_cpu(acpi_cpuidle_device, pr->id) = dev;

- acpi_processor_setup_cpuidle_cx(pr, dev);
+ acpi_processor_setup_cpuidle_dev(pr, dev);

/* Register per-cpu cpuidle_device. Cpuidle driver
* must already be registered before registering device
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 50f2423d31fa..7dd1e63199ed 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_processor_lpi {
+ 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_processor_lpi 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;
@@ -372,7 +390,7 @@ 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)
@@ -385,7 +403,8 @@ 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;
}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 06ed7e54033e..127fdc04e2b5 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -452,8 +452,12 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
#define OSC_SB_HOTPLUG_OST_SUPPORT 0x00000008
#define OSC_SB_APEI_SUPPORT 0x00000010
#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_pc_lpi_support_confirmed;

/* PCI Host Bridge _OSC: Capabilities DWORD 2: Support Field */
#define OSC_PCI_EXT_CONFIG_SUPPORT 0x00000001
--
1.9.1
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