Additional power management updates for 5.6-rc1

Update the recently merged CPR (Core Power Reduction) support in the
 AVS (Adaptive Voltage Scaling) subsystem (Brendan Higgins, Nathan
 Chancellor, Niklas Cassel) and the rockchip-io AVS driver (Heiko
 Stuebner), add two more module parameters to intel_idle on top of the
 recently merged material, clean up a piece of cpuidle documentation
 and consolidate system sleep states documentation (Rafael Wysocki).
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Merge tag 'pm-5.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:

 - Update the recently merged CPR (Core Power Reduction) support in the
   AVS (Adaptive Voltage Scaling) subsystem (Brendan Higgins, Nathan
   Chancellor, Niklas Cassel)

 - Update the rockchip-io AVS driver (Heiko Stuebner)

 - Add two more module parameters to intel_idle on top of the recently
   merged material (Rafael Wysocki)

 - Clean up a piece of cpuidle documentation and consolidate system
   sleep states documentation (Rafael Wysocki)

* tag 'pm-5.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpuidle: Documentation: Clean up PM QoS description
  Documentation: admin-guide: PM: Update sleep states documentation
  intel_idle: Introduce 'states_off' module parameter
  intel_idle: Introduce 'use_acpi' module parameter
  power: avs: qcom-cpr: Avoid clang -Wsometimes-uninitialized in cpr_scale
  power: avs: qcom-cpr: add unspecified HAS_IOMEM dependency
  PM / AVS: rockchip-io: fix the supply naming for the emmc supply on px30
  power: avs: qcom-cpr: add a printout after the driver has been initialized

Documentation/admin-guide/pm/cpuidle.rst

@@ -632,16 +632,16 @@ class priority list and destroyed.  If that happens, the priority list mechanism
 will be used, again, to determine the new effective value for the whole list
 and that value will become the new real constraint.
 
-In turn, for each CPU there is only one resume latency PM QoS request
+In turn, for each CPU there is one resume latency PM QoS request associated with
-associated with the :file:`power/pm_qos_resume_latency_us` file under
+the :file:`power/pm_qos_resume_latency_us` file under
 :file:`/sys/devices/system/cpu/cpu<N>/` in ``sysfs`` and writing to it causes
 this single PM QoS request to be updated regardless of which user space
 process does that.  In other words, this PM QoS request is shared by the entire
 user space, so access to the file associated with it needs to be arbitrated
 to avoid confusion.  [Arguably, the only legitimate use of this mechanism in
 practice is to pin a process to the CPU in question and let it use the
-``sysfs`` interface to control the resume latency constraint for it.]  It
+``sysfs`` interface to control the resume latency constraint for it.]  It is
-still only is a request, however.  It is a member of a priority list used to
+still only a request, however.  It is an entry in a priority list used to
 determine the effective value to be set as the resume latency constraint for the
 CPU in question every time the list of requests is updated this way or another
 (there may be other requests coming from kernel code in that list).

Documentation/admin-guide/pm/intel_idle.rst

@@ -60,6 +60,9 @@ of the system.  The former are always used if the processor model at hand is
 recognized by ``intel_idle`` and the latter are used if that is required for
 the given processor model (which is the case for all server processor models
 recognized by ``intel_idle``) or if the processor model is not recognized.
+[There is a module parameter that can be used to make the driver use the ACPI
+tables with any processor model recognized by it; see
+`below <intel-idle-parameters_>`_.]
 
 If the ACPI tables are going to be used for building the list of available idle
 states, ``intel_idle`` first looks for a ``_CST`` object under one of the ACPI
@@ -165,7 +168,7 @@ and ``idle=nomwait``.  If any of them is present in the kernel command line, the
 ``MWAIT`` instruction is not allowed to be used, so the initialization of
 ``intel_idle`` will fail.
 
-Apart from that there are two module parameters recognized by ``intel_idle``
+Apart from that there are four module parameters recognized by ``intel_idle``
 itself that can be set via the kernel command line (they cannot be updated via
 sysfs, so that is the only way to change their values).
 
@@ -186,9 +189,28 @@ QoS) feature can be used to prevent ``CPUIdle`` from touching those idle states
 even if they have been enumerated (see :ref:`cpu-pm-qos` in :doc:`cpuidle`).
 Setting ``max_cstate`` to 0 causes the ``intel_idle`` initialization to fail.
 
-The ``noacpi`` module parameter (which is recognized by ``intel_idle`` if the
+The ``no_acpi`` and ``use_acpi`` module parameters (recognized by ``intel_idle``
-kernel has been configured with ACPI support), can be set to make the driver
+if the kernel has been configured with ACPI support) can be set to make the
-ignore the system's ACPI tables entirely (it is unset by default).
+driver ignore the system's ACPI tables entirely or use them for all of the
+recognized processor models, respectively (they both are unset by default and
+``use_acpi`` has no effect if ``no_acpi`` is set).
+
+The value of the ``states_off`` module parameter (0 by default) represents a
+list of idle states to be disabled by default in the form of a bitmask.
+
+Namely, the positions of the bits that are set in the ``states_off`` value are
+the indices of idle states to be disabled by default (as reflected by the names
+of the corresponding idle state directories in ``sysfs``, :file:`state0`,
+:file:`state1` ... :file:`state<i>` ..., where ``<i>`` is the index of the given
+idle state; see :ref:`idle-states-representation` in :doc:`cpuidle`).
+
+For example, if ``states_off`` is equal to 3, the driver will disable idle
+states 0 and 1 by default, and if it is equal to 8, idle state 3 will be
+disabled by default and so on (bit positions beyond the maximum idle state index
+are ignored).
+
+The idle states disabled this way can be enabled (on a per-CPU basis) from user
+space via ``sysfs``.
 
 
 .. _intel-idle-core-and-package-idle-states:

Documentation/admin-guide/pm/sleep-states.rst

@@ -153,8 +153,11 @@ for the given CPU architecture includes the low-level code for system resume.
 Basic ``sysfs`` Interfaces for System Suspend and Hibernation
 =============================================================
 
-The following files located in the :file:`/sys/power/` directory can be used by
+The power management subsystem provides userspace with a unified ``sysfs``
-user space for sleep states control.
+interface for system sleep regardless of the underlying system architecture or
+platform.  That interface is located in the :file:`/sys/power/` directory
+(assuming that ``sysfs`` is mounted at :file:`/sys`) and it consists of the
+following attributes (files):
 
 ``state``
 	This file contains a list of strings representing sleep states supported
@@ -162,9 +165,9 @@ user space for sleep states control.
 	to start a transition of the system into the sleep state represented by
 	that string.
 
-	In particular, the strings "disk", "freeze" and "standby" represent the
+	In particular, the "disk", "freeze" and "standby" strings represent the
 	:ref:`hibernation <hibernation>`, :ref:`suspend-to-idle <s2idle>` and
-	:ref:`standby <standby>` sleep states, respectively.  The string "mem"
+	:ref:`standby <standby>` sleep states, respectively.  The "mem" string
 	is interpreted in accordance with the contents of the ``mem_sleep`` file
 	described below.
 
@@ -177,7 +180,7 @@ user space for sleep states control.
 	associated with the "mem" string in the ``state`` file described above.
 
 	The strings that may be present in this file are "s2idle", "shallow"
-	and "deep".  The string "s2idle" always represents :ref:`suspend-to-idle
+	and "deep".  The "s2idle" string always represents :ref:`suspend-to-idle
 	<s2idle>` and, by convention, "shallow" and "deep" represent
 	:ref:`standby <standby>` and :ref:`suspend-to-RAM <s2ram>`,
 	respectively.
@@ -185,15 +188,17 @@ user space for sleep states control.
 	Writing one of the listed strings into this file causes the system
 	suspend variant represented by it to be associated with the "mem" string
 	in the ``state`` file.  The string representing the suspend variant
-	currently associated with the "mem" string in the ``state`` file
+	currently associated with the "mem" string in the ``state`` file is
-	is listed in square brackets.
+	shown in square brackets.
 
 	If the kernel does not support system suspend, this file is not present.
 
 ``disk``
-	This file contains a list of strings representing different operations
+	This file controls the operating mode of hibernation (Suspend-to-Disk).
-	that can be carried out after the hibernation image has been saved.  The
+	Specifically, it tells the kernel what to do after creating a
-	possible options are as follows:
+	hibernation image.
+
+	Reading from it returns a list of supported options encoded as:
 
 	``platform``
 		Put the system into a special low-power state (e.g. ACPI S4) to
@@ -201,6 +206,11 @@ user space for sleep states control.
 		platform firmware to take a simplified initialization path after
 		wakeup.
 
+		It is only available if the platform provides a special
+		mechanism to put the system to sleep after creating a
+		hibernation image (platforms with ACPI do that as a rule, for
+		example).
+
 	``shutdown``
 		Power off the system.
 
@@ -214,22 +224,53 @@ user space for sleep states control.
 		the hibernation image and continue.  Otherwise, use the image
 		to restore the previous state of the system.
 
+		It is available if system suspend is supported.
+
 	``test_resume``
 		Diagnostic operation.  Load the image as though the system had
 		just woken up from hibernation and the currently running kernel
 		instance was a restore kernel and follow up with full system
 		resume.
 
-	Writing one of the listed strings into this file causes the option
+	Writing one of the strings listed above into this file causes the option
 	represented by it to be selected.
 
-	The currently selected option is shown in square brackets which means
+	The currently selected option is shown in square brackets, which means
 	that the operation represented by it will be carried out after creating
-	and saving the image next time hibernation is triggered by writing
+	and saving the image when hibernation is triggered by writing ``disk``
-	``disk`` to :file:`/sys/power/state`.
+	to :file:`/sys/power/state`.
 
 	If the kernel does not support hibernation, this file is not present.
 
+``image_size``
+	This file controls the size of hibernation images.
+
+	It can be written a string representing a non-negative integer that will
+	be used as a best-effort upper limit of the image size, in bytes.  The
+	hibernation core will do its best to ensure that the image size will not
+	exceed that number, but if that turns out to be impossible to achieve, a
+	hibernation image will still be created and its size will be as small as
+	possible.  In particular, writing '0' to this file causes the size of
+	hibernation images to be minimum.
+
+	Reading from it returns the current image size limit, which is set to
+	around 2/5 of the available RAM size by default.
+
+``pm_trace``
+	This file controls the "PM trace" mechanism saving the last suspend
+	or resume event point in the RTC memory across reboots.  It helps to
+	debug hard lockups or reboots due to device driver failures that occur
+	during system suspend or resume (which is more common) more effectively.
+
+	If it contains "1", the fingerprint of each suspend/resume event point
+	in turn will be stored in the RTC memory (overwriting the actual RTC
+	information), so it will survive a system crash if one occurs right
+	after storing it and it can be used later to identify the driver that
+	caused the crash to happen.
+
+	It contains "0" by default, which may be changed to "1" by writing a
+	string representing a nonzero integer into it.
+
 According to the above, there are two ways to make the system go into the
 :ref:`suspend-to-idle <s2idle>` state.  The first one is to write "freeze"
 directly to :file:`/sys/power/state`.  The second one is to write "s2idle" to
@@ -244,6 +285,7 @@ system go into the :ref:`suspend-to-RAM <s2ram>` state (write "deep" into
 The default suspend variant (ie. the one to be used without writing anything
 into :file:`/sys/power/mem_sleep`) is either "deep" (on the majority of systems
 supporting :ref:`suspend-to-RAM <s2ram>`) or "s2idle", but it can be overridden
-by the value of the "mem_sleep_default" parameter in the kernel command line.
+by the value of the ``mem_sleep_default`` parameter in the kernel command line.
-On some ACPI-based systems, depending on the information in the ACPI tables, the
+On some systems with ACPI, depending on the information in the ACPI tables, the
-default may be "s2idle" even if :ref:`suspend-to-RAM <s2ram>` is supported.
+default may be "s2idle" even if :ref:`suspend-to-RAM <s2ram>` is supported in
+principle.

Documentation/power/interface.rst

@@ -1,79 +0,0 @@
-===========================================
-Power Management Interface for System Sleep
-===========================================
-
-Copyright (c) 2016 Intel Corp., Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-
-The power management subsystem provides userspace with a unified sysfs interface
-for system sleep regardless of the underlying system architecture or platform.
-The interface is located in the /sys/power/ directory (assuming that sysfs is
-mounted at /sys).
-
-/sys/power/state is the system sleep state control file.
-
-Reading from it returns a list of supported sleep states, encoded as:
-
-- 'freeze' (Suspend-to-Idle)
-- 'standby' (Power-On Suspend)
-- 'mem' (Suspend-to-RAM)
-- 'disk' (Suspend-to-Disk)
-
-Suspend-to-Idle is always supported.  Suspend-to-Disk is always supported
-too as long the kernel has been configured to support hibernation at all
-(ie. CONFIG_HIBERNATION is set in the kernel configuration file).  Support
-for Suspend-to-RAM and Power-On Suspend depends on the capabilities of the
-platform.
-
-If one of the strings listed in /sys/power/state is written to it, the system
-will attempt to transition into the corresponding sleep state.  Refer to
-Documentation/admin-guide/pm/sleep-states.rst for a description of each of
-those states.
-
-/sys/power/disk controls the operating mode of hibernation (Suspend-to-Disk).
-Specifically, it tells the kernel what to do after creating a hibernation image.
-
-Reading from it returns a list of supported options encoded as:
-
-- 'platform' (put the system into sleep using a platform-provided method)
-- 'shutdown' (shut the system down)
-- 'reboot' (reboot the system)
-- 'suspend' (trigger a Suspend-to-RAM transition)
-- 'test_resume' (resume-after-hibernation test mode)
-
-The currently selected option is printed in square brackets.
-
-The 'platform' option is only available if the platform provides a special
-mechanism to put the system to sleep after creating a hibernation image (ACPI
-does that, for example).  The 'suspend' option is available if Suspend-to-RAM
-is supported.  Refer to Documentation/power/basic-pm-debugging.rst for the
-description of the 'test_resume' option.
-
-To select an option, write the string representing it to /sys/power/disk.
-
-/sys/power/image_size controls the size of hibernation images.
-
-It can be written a string representing a non-negative integer that will be
-used as a best-effort upper limit of the image size, in bytes.  The hibernation
-core will do its best to ensure that the image size will not exceed that number.
-However, if that turns out to be impossible to achieve, a hibernation image will
-still be created and its size will be as small as possible.  In particular,
-writing '0' to this file will enforce hibernation images to be as small as
-possible.
-
-Reading from this file returns the current image size limit, which is set to
-around 2/5 of available RAM by default.
-
-/sys/power/pm_trace controls the PM trace mechanism saving the last suspend
-or resume event point in the RTC across reboots.
-
-It helps to debug hard lockups or reboots due to device driver failures that
-occur during system suspend or resume (which is more common) more effectively.
-
-If /sys/power/pm_trace contains '1', the fingerprint of each suspend/resume
-event point in turn will be stored in the RTC memory (overwriting the actual
-RTC information), so it will survive a system crash if one occurs right after
-storing it and it can be used later to identify the driver that caused the crash
-to happen (see Documentation/power/s2ram.rst for more information).
-
-Initially it contains '0' which may be changed to '1' by writing a string
-representing a nonzero integer into it.

drivers/idle/intel_idle.c

@@ -63,6 +63,7 @@ static struct cpuidle_driver intel_idle_driver = {
 };
 /* intel_idle.max_cstate=0 disables driver */
 static int max_cstate = CPUIDLE_STATE_MAX - 1;
+static unsigned int disabled_states_mask;
 
 static unsigned int mwait_substates;
 
@@ -1131,6 +1132,10 @@ static bool no_acpi __read_mostly;
 module_param(no_acpi, bool, 0444);
 MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list");
 
+static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */
+module_param_named(use_acpi, force_use_acpi, bool, 0444);
+MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list");
+
 static struct acpi_processor_power acpi_state_table __initdata;
 
 /**
@@ -1230,6 +1235,9 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
 		if (cx->type > ACPI_STATE_C2)
 			state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
 
+		if (disabled_states_mask & BIT(cstate))
+			state->flags |= CPUIDLE_FLAG_OFF;
+
 		state->enter = intel_idle;
 		state->enter_s2idle = intel_idle_s2idle;
 	}
@@ -1258,6 +1266,8 @@ static bool __init intel_idle_off_by_default(u32 mwait_hint)
 	return true;
 }
 #else /* !CONFIG_ACPI_PROCESSOR_CSTATE */
+#define force_use_acpi	(false)
+
 static inline bool intel_idle_acpi_cst_extract(void) { return false; }
 static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { }
 static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; }
@@ -1460,8 +1470,10 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
 		/* Structure copy. */
 		drv->states[drv->state_count] = cpuidle_state_table[cstate];
 
-		if (icpu->use_acpi && intel_idle_off_by_default(mwait_hint) &&
+		if ((disabled_states_mask & BIT(drv->state_count)) ||
-		    !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE))
+		    ((icpu->use_acpi || force_use_acpi) &&
+		     intel_idle_off_by_default(mwait_hint) &&
+		     !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
 			drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
 
 		drv->state_count++;
@@ -1480,6 +1492,10 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
 static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv)
 {
 	cpuidle_poll_state_init(drv);
+
+	if (disabled_states_mask & BIT(0))
+		drv->states[0].flags |= CPUIDLE_FLAG_OFF;
+
 	drv->state_count = 1;
 
 	if (icpu)
@@ -1607,7 +1623,7 @@ static int __init intel_idle_init(void)
 	icpu = (const struct idle_cpu *)id->driver_data;
 	if (icpu) {
 		cpuidle_state_table = icpu->state_table;
-		if (icpu->use_acpi)
+		if (icpu->use_acpi || force_use_acpi)
 			intel_idle_acpi_cst_extract();
 	} else if (!intel_idle_acpi_cst_extract()) {
 		return -ENODEV;
@@ -1660,3 +1676,11 @@ device_initcall(intel_idle_init);
  * is the easiest way (currently) to continue doing that.
  */
 module_param(max_cstate, int, 0444);
+/*
+ * The positions of the bits that are set in this number are the indices of the
+ * idle states to be disabled by default (as reflected by the names of the
+ * corresponding idle state directories in sysfs, "state0", "state1" ...
+ * "state<i>" ..., where <i> is the index of the given state).
+ */
+module_param_named(states_off, disabled_states_mask, uint, 0444);
+MODULE_PARM_DESC(states_off, "Mask of disabled idle states");

drivers/power/avs/Kconfig

@@ -14,7 +14,7 @@ menuconfig POWER_AVS
 
 config QCOM_CPR
 	tristate "QCOM Core Power Reduction (CPR) support"
-	depends on POWER_AVS
+	depends on POWER_AVS && HAS_IOMEM
 	select PM_OPP
 	select REGMAP
 	help

drivers/power/avs/qcom-cpr.c

@@ -517,7 +517,7 @@ static int cpr_scale(struct cpr_drv *drv, enum voltage_change_dir dir)
 		dev_dbg(drv->dev,
 			"UP: -> new_uV: %d last_uV: %d perf state: %u\n",
 			new_uV, last_uV, cpr_get_cur_perf_state(drv));
-	} else if (dir == DOWN) {
+	} else {
 		if (desc->clamp_timer_interval &&
 		    error_steps < desc->down_threshold) {
 			/*
@@ -567,7 +567,7 @@ static int cpr_scale(struct cpr_drv *drv, enum voltage_change_dir dir)
 		/* Disable auto nack down */
 		reg_mask = RBCPR_CTL_SW_AUTO_CONT_NACK_DN_EN;
 		val = 0;
-	} else if (dir == DOWN) {
+	} else {
 		/* Restore default threshold for UP */
 		reg_mask = RBCPR_CTL_UP_THRESHOLD_MASK;
 		reg_mask <<= RBCPR_CTL_UP_THRESHOLD_SHIFT;
@@ -1547,8 +1547,6 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain,
 		goto unlock;
 	}
 
-	dev_dbg(drv->dev, "number of OPPs: %d\n", drv->num_corners);
-
 	drv->corners = devm_kcalloc(drv->dev, drv->num_corners,
 				    sizeof(*drv->corners),
 				    GFP_KERNEL);
@@ -1586,6 +1584,9 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain,
 				   acc_desc->enable_mask,
 				   acc_desc->enable_mask);
 
+	dev_info(drv->dev, "driver initialized with %u OPPs\n",
+		 drv->num_corners);
+
 unlock:
 	mutex_unlock(&drv->lock);
 

drivers/power/avs/rockchip-io-domain.c

@@ -152,18 +152,18 @@ static void px30_iodomain_init(struct rockchip_iodomain *iod)
 	int ret;
 	u32 val;
 
-	/* if no VCCIO0 supply we should leave things alone */
+	/* if no VCCIO6 supply we should leave things alone */
 	if (!iod->supplies[PX30_IO_VSEL_VCCIO6_SUPPLY_NUM].reg)
 		return;
 
 	/*
-	 * set vccio0 iodomain to also use this framework
+	 * set vccio6 iodomain to also use this framework
 	 * instead of a special gpio.
 	 */
 	val = PX30_IO_VSEL_VCCIO6_SRC | (PX30_IO_VSEL_VCCIO6_SRC << 16);
 	ret = regmap_write(iod->grf, PX30_IO_VSEL, val);
 	if (ret < 0)
-		dev_warn(iod->dev, "couldn't update vccio0 ctrl\n");
+		dev_warn(iod->dev, "couldn't update vccio6 ctrl\n");
 }
 
 static void rk3288_iodomain_init(struct rockchip_iodomain *iod)