Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
---
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/acpi.c | 35 ++++
arch/arm64/kernel/psci.c | 74 ++++++--
drivers/acpi/Kconfig | 3 +
drivers/acpi/bus.c | 8 +-
drivers/acpi/processor_driver.c | 2 +-
drivers/acpi/processor_idle.c | 409 +++++++++++++++++++++++++++++++++++-----
include/acpi/processor.h | 26 ++-
include/linux/acpi.h | 4 +
9 files changed, 496 insertions(+), 66 deletions(-)
Hi Rafael,
This patch adds initial LPI support to ACPI processor idle driver. It's
still WIP and I would like to get feedback before I proceed further. I
am posting this so that we can discuss in LPC.
Regards,
Sudeep
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a62bcc02cc75..92c25451842c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -9,6 +9,7 @@ config ARM64
select ARCH_HAS_SG_CHAIN
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_USE_CMPXCHG_LOCKREF
+ select ARCH_SUPPORTS_ACPI_PROCESSOR_LPI if ACPI
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index c43e476486ca..050b6bfcb6ac 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -18,6 +18,7 @@
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/cpumask.h>
+#include <linux/cpu_pm.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
@@ -26,9 +27,11 @@
#include <linux/smp.h>
#include <acpi/processor.h>
+#include <asm/cpuidle.h>
#include <asm/cputype.h>
#include <asm/cpu_ops.h>
#include <asm/smp_plat.h>
+#include <asm/suspend.h>
int acpi_noirq = 1; /* skip ACPI IRQ initialization */
int acpi_disabled = 1;
@@ -207,6 +210,38 @@ void __init acpi_boot_table_init(void)
}
}
+#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI
+int acpi_processor_ffh_lpi_probe(unsigned int cpu)
+{
+ return arm_cpuidle_init(cpu);
+}
+
+int acpi_processor_ffh_lpi_enter(struct acpi_processor_lpi *lpi, int idx)
+{
+ int ret;
+
+ if (!idx) {
+ cpu_do_idle();
+ return idx;
+ }
+
+ /* TODO cpu_pm_{enter,exit} can be done in generic code ? */
+ ret = cpu_pm_enter();
+ if (!ret) {
+ /*
+ * Pass idle state index to cpu_suspend which in turn will
+ * call the CPU ops suspend protocol with idle index as a
+ * parameter.
+ */
+ ret = arm_cpuidle_suspend(idx);
+
+ cpu_pm_exit();
+ }
+
+ return ret ? -1 : idx;
+}
+#endif /* CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI */
+
/*
* ACPI based hotplug support for CPU
* Currently we don't support physical hotplug on ARM64, hence
diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
index aa94a88f6279..79bed5e82cae 100644
--- a/arch/arm64/kernel/psci.c
+++ b/arch/arm64/kernel/psci.c
@@ -16,11 +16,12 @@
#define pr_fmt(fmt) "psci: " fmt
#include <linux/init.h>
-#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/psci.h>
#include <linux/slab.h>
+#include <linux/acpi.h>
#include <uapi/linux/psci.h>
@@ -29,24 +30,11 @@
#include <asm/errno.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>
-
-static bool psci_power_state_loses_context(u32 state)
-{
- return state & PSCI_0_2_POWER_STATE_TYPE_MASK;
-}
-
-static bool psci_power_state_is_valid(u32 state)
-{
- const u32 valid_mask = PSCI_0_2_POWER_STATE_ID_MASK |
- PSCI_0_2_POWER_STATE_TYPE_MASK |
- PSCI_0_2_POWER_STATE_AFFL_MASK;
-
- return !(state & ~valid_mask);
-}
+#include <acpi/processor.h>
static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
-static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
+static int __maybe_unused __cpu_psci_init_idle_dt(unsigned int cpu)
{
int i, ret, count = 0;
u32 *psci_states;
@@ -110,6 +98,60 @@ static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
return ret;
}
+static int __maybe_unused __cpu_psci_init_idle_acpi(unsigned int cpu)
+{
+ int i, count;
+ u32 *psci_states;
+ struct acpi_processor *pr;
+ struct acpi_processor_lpi *lpi;
+
+ if (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI))
+ return 0;
+
+ pr = per_cpu(processors, cpu);
+ if (unlikely(!pr || !pr->flags.has_lpi))
+ return -EINVAL;
+
+ /*
+ * If the PSCI cpu_suspend function hook has not been initialized
+ * idle states must not be enabled, so bail out
+ */
+ if (!psci_ops.cpu_suspend)
+ return -EOPNOTSUPP;
+
+ count = pr->power.count - 1;
+ if (!count)
+ return -ENODEV;
+
+ psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
+ if (!psci_states)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ u32 state;
+
+ lpi = &pr->power.lpi_states[i + 1];
+ state = lpi->address & 0xFFFFFFFF;
+ if (!psci_power_state_is_valid(state)) {
+ pr_warn("Invalid PSCI power state %#x\n", state);
+ kfree(psci_states);
+ return -EINVAL;
+ }
+ psci_states[i] = state;
+ }
+ /* Idle states parsed correctly, initialize per-cpu pointer */
+ per_cpu(psci_power_state, cpu) = psci_states;
+ return 0;
+}
+
+static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
+{
+ if (!acpi_disabled)
+ return __cpu_psci_init_idle_acpi(cpu);
+
+ return __cpu_psci_init_idle_dt(cpu);
+}
+
static int __init cpu_psci_cpu_init(unsigned int cpu)
{
return 0;
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 3578e7abff66..85c02e7e296b 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -51,6 +51,9 @@ config ARCH_MIGHT_HAVE_ACPI_PDC
config ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
bool
+config ARCH_SUPPORTS_ACPI_PROCESSOR_LPI
+ bool
+
config ACPI_GENERIC_GSI
bool
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index a212cefae524..2e9e2e3fde6a 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -301,6 +301,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
EXPORT_SYMBOL(acpi_run_osc);
bool osc_sb_apei_support_acked;
+bool osc_pc_lpi_support_acked;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
{
@@ -321,6 +322,8 @@ 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;
+ if (IS_ENABLED(CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI))
+ capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
if (!ghes_disable)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
@@ -328,9 +331,12 @@ 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_acked =
+ 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 d487a529d7ba..19b82706490c 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 9ca840c88f48..5ceb0de8f789 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -576,7 +576,7 @@ 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 +810,12 @@ 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 +838,13 @@ 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;
@@ -943,24 +906,378 @@ 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;
}
-
static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
struct cpuidle_device *dev)
{
return -EINVAL;
}
+static int acpi_processor_setup_cstates(struct acpi_processor *pr)
+{
+ return -EINVAL;
+}
-static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
+#endif
+
+#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI
+
+struct acpi_processor_lpi_info {
+ int state_count;
+ struct acpi_processor_lpi *lpix;
+};
+
+static int acpi_processor_evaluate_lpi(acpi_handle handle,
+ struct acpi_processor_lpi_info *info)
+{
+ acpi_status status = 0;
+ int ret;
+ int version, level, pkg_count, state_count = 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_info( "not enough elements in _LPI\n");
+ ret = -EFAULT;
+ goto end;
+ }
+
+ version = lpi->package.elements[0].integer.value;
+ level = lpi->package.elements[1].integer.value;
+ pkg_count = lpi->package.elements[2].integer.value;
+
+ /* Validate number of power states. */
+ if (pkg_count < 1 || pkg_count != lpi->package.count - 3) {
+ pr_err("count given by _LPI is not valid\n");
+ ret = -EFAULT;
+ goto end;
+ }
+
+ lpix = kcalloc(pkg_count, sizeof(*lpix), GFP_KERNEL);
+ if (!lpix) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ info->state_count = pkg_count;
+ info->lpix = lpix;
+ for (loop = 3; state_count <= pkg_count; loop++, state_count++, lpix++) {
+ union acpi_object *element, *obj;
+
+ element = &(lpi->package.elements[loop]);
+ if (element->type != ACPI_TYPE_PACKAGE)
+ continue;
+
+ if (element->package.count < 7)
+ continue;
+
+ /* TODO
+ * this long list is looking insane now
+ * need a cleaner and saner way to read the elements
+ */
+ obj = &(element->package.elements[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->address = obj->integer.value;
+ } else
+ continue;
+
+ /* elements[7,8] skipped for now i.e. Residency/Usage counter*/
+
+ obj = &(element->package.elements[9]);
+ if (obj->type == ACPI_TYPE_STRING)
+ strncpy(lpix->desc, obj->string.pointer, ACPI_CX_DESC_LEN);
+
+ lpix->index = state_count;
+
+ obj = &(element->package.elements[0]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->min_residency = obj->integer.value;
+
+ obj = &(element->package.elements[1]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->wake_latency = obj->integer.value;
+
+ obj = &(element->package.elements[2]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->flags = obj->integer.value;
+
+ obj = &(element->package.elements[3]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->arch_flags = obj->integer.value;
+
+ obj = &(element->package.elements[4]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->res_cnt_freq = obj->integer.value;
+
+ obj = &(element->package.elements[5]);
+ if (obj->type != ACPI_TYPE_INTEGER)
+ continue;
+ lpix->enable_parent_state = obj->integer.value;
+ }
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
+ state_count));
+end:
+ kfree(buffer.pointer);
+ return status;
+}
+
+static int max_leaf_depth, fl_scnt;
+/*
+ * 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;
+ c_lpi->address = l_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;
+ strncpy(c_lpi->desc, l_lpi->desc, ACPI_CX_DESC_LEN);
+ strncat(c_lpi->desc, "+", ACPI_CX_DESC_LEN);
+ strncat(c_lpi->desc, p_lpi->desc, ACPI_CX_DESC_LEN);
+}
+
+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 = &(pr->power.lpi_states[fl_scnt]);
+ int valid = 0;
+ if (depth == max_leaf_depth) { /* leaf/processor node */
+ memcpy(flpi, t, sizeof(*t));
+ fl_scnt++;
+ valid = 1;
+ } else if (lpi && t->index <= lpi->enable_parent_state) {
+ combine_lpi_states(lpi, t, flpi);
+ fl_scnt++;
+ valid = 1;
+ }
+ 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, phandle;
+ acpi_status status;
+
+ if (!osc_pc_lpi_support_acked)
+ 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, &phandle))) {
+ 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 = phandle;
+ }
+
+ info = kcalloc(max_leaf_depth + 1, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ phandle = pr->handle;
+ for (i = max_leaf_depth; i >= 0 && ACPI_SUCCESS(status); i--) {
+ handle = phandle;
+ ret = acpi_processor_evaluate_lpi(handle, info + i);
+ if (ret)
+ break;
+ status = acpi_get_parent(handle, &phandle);
+ }
+
+ 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;
+}
+
+/**
+ * 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
+ *
+ */
+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;
+
+ 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);
+ strncpy(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;
+}
+
+#else
+static int acpi_processor_ffh_lpi_probe(unsigned int cpu) { return -ENODEV; }
+static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
+{
+ return -EINVAL;
+}
#endif
+/**
+ * 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);
+ else
+ return acpi_processor_setup_cpuidle_cx(pr, dev);
+}
+
+static int acpi_processor_get_power_info(struct acpi_processor *pr)
+{
+ int ret = 0;
+
+ ret = acpi_processor_get_cstate_info(pr);
+ if (ret)
+ ret = acpi_processor_get_lpi_info(pr);
+ return ret;
+}
+
int acpi_processor_hotplug(struct acpi_processor *pr)
{
int ret = 0;
@@ -980,7 +1297,7 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
cpuidle_disable_device(dev);
acpi_processor_get_power_info(pr);
if (pr->flags.power) {
- acpi_processor_setup_cpuidle_cx(pr, dev);
+ acpi_processor_setup_cpuidle_dev(pr, dev);
ret = cpuidle_enable_device(dev);
}
cpuidle_resume_and_unlock();
@@ -988,7 +1305,7 @@ 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;
@@ -1036,7 +1353,7 @@ 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);
}
}
@@ -1093,7 +1410,7 @@ 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 bd7070e2b59a..bbb3d591959e 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -67,9 +67,25 @@ 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 +205,7 @@ 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;
@@ -272,6 +289,11 @@ static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
}
#endif
+#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI
+int acpi_processor_ffh_lpi_probe(unsigned int cpu);
+int acpi_processor_ffh_lpi_enter(struct acpi_processor_lpi *lpi, int idx);
+#endif
+
/* in processor_perflib.c */
#ifdef CONFIG_CPU_FREQ
@@ -332,7 +354,7 @@ extern void acpi_processor_throttling_init(void);
/* in processor_idle.c */
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);
extern struct cpuidle_driver acpi_idle_driver;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 01e6770d8e27..52f7d14d2c98 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -357,8 +357,12 @@ 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_acked;
/* PCI Host Bridge _OSC: Capabilities DWORD 2: Support Field */
#define OSC_PCI_EXT_CONFIG_SUPPORT 0x00000001
--
1.9.1
--
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