Merge branch 'acpi-pm' into pm-core

Author: rafaeljw

Documentation/ABI/testing/sysfs-devices-power

@@ -258,19 +258,3 @@ Description:
 
 		This attribute has no effect on system-wide suspend/resume and
 		hibernation.
-
-What:		/sys/devices/.../power/pm_qos_remote_wakeup
-Date:		September 2012
-Contact:	Rafael J. Wysocki <[email protected]>
-Description:
-		The /sys/devices/.../power/pm_qos_remote_wakeup attribute
-		is used for manipulating the PM QoS "remote wakeup required"
-		flag.  If set, this flag indicates to the kernel that the
-		device is a source of user events that have to be signaled from
-		its low-power states.
-
-		Not all drivers support this attribute.  If it isn't supported,
-		it is not present.
-
-		This attribute has no effect on system-wide suspend/resume and
-		hibernation.

Documentation/acpi/lpit.txt

@@ -0,0 +1,25 @@
+To enumerate platform Low Power Idle states, Intel platforms are using
+“Low Power Idle Table” (LPIT). More details about this table can be
+downloaded from:
+http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf
+
+Residencies for each low power state can be read via FFH
+(Function fixed hardware) or a memory mapped interface.
+
+On platforms supporting S0ix sleep states, there can be two types of
+residencies:
+- CPU PKG C10 (Read via FFH interface)
+- Platform Controller Hub (PCH) SLP_S0 (Read via memory mapped interface)
+
+The following attributes are added dynamically to the cpuidle
+sysfs attribute group:
+	/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
+	/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us
+
+The "low_power_idle_cpu_residency_us" attribute shows time spent
+by the CPU package in PKG C10
+
+The "low_power_idle_system_residency_us" attribute shows SLP_S0
+residency, or system time spent with the SLP_S0# signal asserted.
+This is the lowest possible system power state, achieved only when CPU is in
+PKG C10 and all functional blocks in PCH are in a low power state.

Documentation/power/pm_qos_interface.txt

@@ -98,8 +98,7 @@ Values are updated in response to changes of the request list.
 The target values of resume latency and active state latency tolerance are
 simply the minimum of the request values held in the parameter list elements.
 The PM QoS flags aggregate value is a gather (bitwise OR) of all list elements'
-values.  Two device PM QoS flags are defined currently: PM_QOS_FLAG_NO_POWER_OFF
-and PM_QOS_FLAG_REMOTE_WAKEUP.
+values.  One device PM QoS flag is defined currently: PM_QOS_FLAG_NO_POWER_OFF.
 
 Note: The aggregated target values are implemented in such a way that reading
 the aggregated value does not require any locking mechanism.
@@ -153,14 +152,14 @@ PM QoS list of resume latency constraints and remove sysfs attribute
 pm_qos_resume_latency_us from the device's power directory.
 
 int dev_pm_qos_expose_flags(device, value)
-Add a request to the device's PM QoS list of flags and create sysfs attributes
-pm_qos_no_power_off and pm_qos_remote_wakeup under the device's power directory
-allowing user space to change these flags' value.
+Add a request to the device's PM QoS list of flags and create sysfs attribute
+pm_qos_no_power_off under the device's power directory allowing user space to
+change the value of the PM_QOS_FLAG_NO_POWER_OFF flag.
 
 void dev_pm_qos_hide_flags(device)
 Drop the request added by dev_pm_qos_expose_flags() from the device's PM QoS list
-of flags and remove sysfs attributes pm_qos_no_power_off and pm_qos_remote_wakeup
-under the device's power directory.
+of flags and remove sysfs attribute pm_qos_no_power_off from the device's power
+directory.
 
 Notification mechanisms:
 The per-device PM QoS framework has a per-device notification tree.

drivers/acpi/Kconfig

@@ -80,6 +80,11 @@ endif
 config ACPI_SPCR_TABLE
 	bool
 
+config ACPI_LPIT
+	bool
+	depends on X86_64
+	default y
+
 config ACPI_SLEEP
 	bool
 	depends on SUSPEND || HIBERNATION

drivers/acpi/Makefile

@@ -56,6 +56,7 @@ acpi-$(CONFIG_DEBUG_FS)		+= debugfs.o
 acpi-$(CONFIG_ACPI_NUMA)	+= numa.o
 acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o
 acpi-y				+= acpi_lpat.o
+acpi-$(CONFIG_ACPI_LPIT)	+= acpi_lpit.o
 acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o
 acpi-$(CONFIG_ACPI_WATCHDOG)	+= acpi_watchdog.o
 

drivers/acpi/acpi_lpit.c

@@ -0,0 +1,162 @@
+
+/*
+ * acpi_lpit.c - LPIT table processing functions
+ *
+ * Copyright (C) 2017 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/cpu.h>
+#include <linux/acpi.h>
+#include <asm/msr.h>
+#include <asm/tsc.h>
+
+struct lpit_residency_info {
+	struct acpi_generic_address gaddr;
+	u64 frequency;
+	void __iomem *iomem_addr;
+};
+
+/* Storage for an memory mapped and FFH based entries */
+static struct lpit_residency_info residency_info_mem;
+static struct lpit_residency_info residency_info_ffh;
+
+static int lpit_read_residency_counter_us(u64 *counter, bool io_mem)
+{
+	int err;
+
+	if (io_mem) {
+		u64 count = 0;
+		int error;
+
+		error = acpi_os_read_iomem(residency_info_mem.iomem_addr, &count,
+					   residency_info_mem.gaddr.bit_width);
+		if (error)
+			return error;
+
+		*counter = div64_u64(count * 1000000ULL, residency_info_mem.frequency);
+		return 0;
+	}
+
+	err = rdmsrl_safe(residency_info_ffh.gaddr.address, counter);
+	if (!err) {
+		u64 mask = GENMASK_ULL(residency_info_ffh.gaddr.bit_offset +
+				       residency_info_ffh.gaddr. bit_width - 1,
+				       residency_info_ffh.gaddr.bit_offset);
+
+		*counter &= mask;
+		*counter >>= residency_info_ffh.gaddr.bit_offset;
+		*counter = div64_u64(*counter * 1000000ULL, residency_info_ffh.frequency);
+		return 0;
+	}
+
+	return -ENODATA;
+}
+
+static ssize_t low_power_idle_system_residency_us_show(struct device *dev,
+						       struct device_attribute *attr,
+						       char *buf)
+{
+	u64 counter;
+	int ret;
+
+	ret = lpit_read_residency_counter_us(&counter, true);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%llu\n", counter);
+}
+static DEVICE_ATTR_RO(low_power_idle_system_residency_us);
+
+static ssize_t low_power_idle_cpu_residency_us_show(struct device *dev,
+						    struct device_attribute *attr,
+						    char *buf)
+{
+	u64 counter;
+	int ret;
+
+	ret = lpit_read_residency_counter_us(&counter, false);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%llu\n", counter);
+}
+static DEVICE_ATTR_RO(low_power_idle_cpu_residency_us);
+
+int lpit_read_residency_count_address(u64 *address)
+{
+	if (!residency_info_mem.gaddr.address)
+		return -EINVAL;
+
+	*address = residency_info_mem.gaddr.address;
+
+	return 0;
+}
+
+static void lpit_update_residency(struct lpit_residency_info *info,
+				 struct acpi_lpit_native *lpit_native)
+{
+	info->frequency = lpit_native->counter_frequency ?
+				lpit_native->counter_frequency : tsc_khz * 1000;
+	if (!info->frequency)
+		info->frequency = 1;
+
+	info->gaddr = lpit_native->residency_counter;
+	if (info->gaddr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+		info->iomem_addr = ioremap_nocache(info->gaddr.address,
+						   info->gaddr.bit_width / 8);
+		if (!info->iomem_addr)
+			return;
+
+		/* Silently fail, if cpuidle attribute group is not present */
+		sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj,
+					&dev_attr_low_power_idle_system_residency_us.attr,
+					"cpuidle");
+	} else if (info->gaddr.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
+		/* Silently fail, if cpuidle attribute group is not present */
+		sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj,
+					&dev_attr_low_power_idle_cpu_residency_us.attr,
+					"cpuidle");
+	}
+}
+
+static void lpit_process(u64 begin, u64 end)
+{
+	while (begin + sizeof(struct acpi_lpit_native) < end) {
+		struct acpi_lpit_native *lpit_native = (struct acpi_lpit_native *)begin;
+
+		if (!lpit_native->header.type && !lpit_native->header.flags) {
+			if (lpit_native->residency_counter.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY &&
+			    !residency_info_mem.gaddr.address) {
+				lpit_update_residency(&residency_info_mem, lpit_native);
+			} else if (lpit_native->residency_counter.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
+				   !residency_info_ffh.gaddr.address) {
+				lpit_update_residency(&residency_info_ffh, lpit_native);
+			}
+		}
+		begin += lpit_native->header.length;
+	}
+}
+
+void acpi_init_lpit(void)
+{
+	acpi_status status;
+	u64 lpit_begin;
+	struct acpi_table_lpit *lpit;
+
+	status = acpi_get_table(ACPI_SIG_LPIT, 0, (struct acpi_table_header **)&lpit);
+
+	if (ACPI_FAILURE(status))
+		return;
+
+	lpit_begin = (u64)lpit + sizeof(*lpit);
+	lpit_process(lpit_begin, lpit_begin + lpit->header.length);
+}

drivers/acpi/acpi_lpss.c

@@ -713,43 +713,9 @@ static int acpi_lpss_activate(struct device *dev)
 
 static void acpi_lpss_dismiss(struct device *dev)
 {
-	acpi_dev_runtime_suspend(dev);
+	acpi_dev_suspend(dev, false);
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int acpi_lpss_suspend_late(struct device *dev)
-{
-	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-	int ret;
-
-	ret = pm_generic_suspend_late(dev);
-	if (ret)
-		return ret;
-
-	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
-		acpi_lpss_save_ctx(dev, pdata);
-
-	return acpi_dev_suspend_late(dev);
-}
-
-static int acpi_lpss_resume_early(struct device *dev)
-{
-	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-	int ret;
-
-	ret = acpi_dev_resume(dev);
-	if (ret)
-		return ret;
-
-	acpi_lpss_d3_to_d0_delay(pdata);
-
-	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
-		acpi_lpss_restore_ctx(dev, pdata);
-
-	return pm_generic_resume_early(dev);
-}
-#endif /* CONFIG_PM_SLEEP */
-
 /* IOSF SB for LPSS island */
 #define LPSS_IOSF_UNIT_LPIOEP		0xA0
 #define LPSS_IOSF_UNIT_LPIO1		0xAB
@@ -835,19 +801,15 @@ static void lpss_iosf_exit_d3_state(void)
 	mutex_unlock(&lpss_iosf_mutex);
 }
 
-static int acpi_lpss_runtime_suspend(struct device *dev)
+static int acpi_lpss_suspend(struct device *dev, bool wakeup)
 {
 	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 	int ret;
 
-	ret = pm_generic_runtime_suspend(dev);
-	if (ret)
-		return ret;
-
 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
 		acpi_lpss_save_ctx(dev, pdata);
 
-	ret = acpi_dev_runtime_suspend(dev);
+	ret = acpi_dev_suspend(dev, wakeup);
 
 	/*
 	 * This call must be last in the sequence, otherwise PMC will return
@@ -860,7 +822,7 @@ static int acpi_lpss_runtime_suspend(struct device *dev)
 	return ret;
 }
 
-static int acpi_lpss_runtime_resume(struct device *dev)
+static int acpi_lpss_resume(struct device *dev)
 {
 	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 	int ret;
@@ -881,7 +843,37 @@ static int acpi_lpss_runtime_resume(struct device *dev)
 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
 		acpi_lpss_restore_ctx(dev, pdata);
 
-	return pm_generic_runtime_resume(dev);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int acpi_lpss_suspend_late(struct device *dev)
+{
+	int ret = pm_generic_suspend_late(dev);
+
+	return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
+}
+
+static int acpi_lpss_resume_early(struct device *dev)
+{
+	int ret = acpi_lpss_resume(dev);
+
+	return ret ? ret : pm_generic_resume_early(dev);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static int acpi_lpss_runtime_suspend(struct device *dev)
+{
+	int ret = pm_generic_runtime_suspend(dev);
+
+	return ret ? ret : acpi_lpss_suspend(dev, true);
+}
+
+static int acpi_lpss_runtime_resume(struct device *dev)
+{
+	int ret = acpi_lpss_resume(dev);
+
+	return ret ? ret : pm_generic_runtime_resume(dev);
 }
 #endif /* CONFIG_PM */