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Date: Tue, 12 Apr 2016 09:36:29 +0530
From: Vikas Sajjan <sajjan.linux@...il.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: linux-acpi@...r.kernel.org,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
x86@...nel.org, Al Stone <al.stone@...aro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Mahesh Sivasubramanian <msivasub@...eaurora.org>,
Ashwin Chaugule <ashwin.chaugule@...aro.org>,
Prashanth Prakash <pprakash@...eaurora.org>,
Vikas C Sajjan <vikas.cha.sajjan@....com>,
Sunil V L <sunil.vl@....com>
Subject: Re: [PATCH v3 5/5] ACPI / processor_idle: Add support for Low Power
Idle(LPI) states
Hi Sudeep,
On Wed, Dec 2, 2015 at 7:40 PM, Sudeep Holla <sudeep.holla@....com> wrote:
> 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@...ysocki.net>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
> drivers/acpi/Kconfig | 3 +
> drivers/acpi/bus.c | 8 +-
> drivers/acpi/processor_driver.c | 2 +-
> drivers/acpi/processor_idle.c | 440 +++++++++++++++++++++++++++++++++++-----
> include/acpi/processor.h | 30 ++-
> include/linux/acpi.h | 4 +
> 6 files changed, 435 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 12873f0b8141..89a2d9b81feb 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 29f787b2493f..bfc59de0ce6b 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);
The function acpi_processor_power_state_has_changed() has a check as below,
if (nocst)
return -ENODEV;
So was wondering if the platform supports only _LPI and _CST is not
supported, the 'nocst' module param passed will be 1,
and function will return -ENODEV.
Hence, with the introduction of LPI, should we be handling "nocst"
appropriately.
Similar is the case in function int acpi_processor_hotplug(struct
acpi_processor *pr);
Let me know, if i am missing something here.
> 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..73192c08bc8c 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;
>
> @@ -893,7 +856,7 @@ 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;
> @@ -943,24 +906,407 @@ 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_cpuidle_states(struct acpi_processor *pr)
> +static int acpi_processor_setup_cstates(struct acpi_processor *pr)
> +{
> + return -EINVAL;
> +}
> +#endif
> +
> +#ifdef CONFIG_ARCH_SUPPORTS_ACPI_PROCESSOR_LPI
> +
> +#define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0)
> +
> +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_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_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;
> + /* LPI States start at index 3 */
> + for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, 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->entry_method = ACPI_CSTATE_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)
> + strlcpy(lpix->desc, obj->string.pointer,
> + ACPI_CX_DESC_LEN);
> +
> + lpix->index = state_idx;
> +
> + 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_idx));
> +end:
> + kfree(buffer.pointer);
> + return status;
> +}
> +
> +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;
> +
> + if (p_lpi->entry_method == ACPI_CSTATE_INTEGER) {
> + c_lpi->entry_method = l_lpi->entry_method;
> + c_lpi->address = l_lpi->address + p_lpi->address;
> + } else {
> + c_lpi->entry_method = l_lpi->entry_method;
> + 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);
> +}
> +
> +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, 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 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;
> +}
> +
> +/**
> + * 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;
> +
> + 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;
> +}
> +
> +#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 +1326,7 @@ 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 +1334,7 @@ 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 +1382,7 @@ 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 +1439,7 @@ 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..f3006831d427 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;
> @@ -272,6 +290,11 @@ 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
> @@ -372,7 +395,7 @@ 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 +408,8 @@ 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 054833939995..962a63b266cc 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -380,8 +380,12 @@ 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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