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/linux-5.10/Documentation/devicetree/bindings/arm/
Didle-states.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/arm/idle-states.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
14 1 - Introduction
18 where cores can be put in different low-power states (ranging from simple wfi
20 range of dynamic idle states that a processor can enter at run-time, can be
27 - Running
28 - Idle_standby
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/linux-5.10/Documentation/arm/omap/
Domap_pm.rst6 authors use these functions to communicate minimum latency or
13 - support the range of power management parameters present in the TI SRF;
15 - separate the drivers from the underlying PM parameter
17 latency framework or something else;
19 - specify PM parameters in terms of fundamental units, such as
20 latency and throughput, rather than units which are specific to OMAP
23 - allow drivers which are shared with other architectures (e.g.,
24 DaVinci) to add these constraints in a way which won't affect non-OMAP
27 - can be implemented immediately with minimal disruption of other
34 1. Set the maximum MPU wakeup latency::
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/linux-5.10/Documentation/ABI/testing/
Dsysfs-devices-power9 What: /sys/devices/.../power/wakeup
13 The /sys/devices/.../power/wakeup attribute allows the user
19 Some devices support "wakeup" events, which are hardware signals
21 have one of the following two values for the sysfs power/wakeup
31 For the devices that are not capable of generating system wakeup
40 space to control the run-time power management of the device.
61 with the main suspend/resume thread) during system-wide power
85 of signaled wakeup events associated with the device. This
86 attribute is read-only. If the device is not capable to wake up
96 number of times the processing of wakeup events associated with
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/linux-5.10/Documentation/admin-guide/pm/
Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
37 software as individual single-core processors. In other words, a CPU is an
46 Second, if the processor is multi-core, each core in it is able to follow at
61 Finally, each core in a multi-core processor may be able to follow more than one
66 multiple individual single-core "processors", referred to as *hardware threads*
67 (or hyper-threads specifically on Intel hardware), that each can follow one
78 ---------
107 next wakeup event, or there are strict latency constraints preventing any of the
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Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
40 also be set up as wakeup devices for S2Idle.
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
44 deeper system suspend variants to provide reduced resume latency. It is always
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/linux-5.10/Documentation/devicetree/bindings/net/
Dmarvell-bt-8xxx.txt2 ------
9 - compatible : should be one of the following:
10 * "marvell,sd8897-bt" (for SDIO)
11 * "marvell,sd8997-bt" (for SDIO)
16 - marvell,cal-data: Calibration data downloaded to the device during
20 - marvell,wakeup-pin: It represents wakeup pin number of the bluetooth chip.
21 firmware will use the pin to wakeup host system (u16).
22 - marvell,wakeup-gap-ms: wakeup gap represents wakeup latency of the host
25 - interrupt-names: Used only for USB based devices (See below)
26 - interrupts : specifies the interrupt pin number to the cpu. For SDIO, the
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/linux-5.10/Documentation/virt/kvm/
Dhalt-polling.rst1 .. SPDX-License-Identifier: GPL-2.0
7 The KVM halt polling system provides a feature within KVM whereby the latency
11 vcpus of a single vcore have ceded, the host kernel polls for wakeup conditions
14 Polling provides a latency advantage in cases where the guest can be run again
16 the order of a few micro-seconds, although performance benefits are workload
17 dependant. In the event that no wakeup source arrives during the polling
20 wakeup periods where the time spent halt polling is minimised and the time
27 The powerpc kvm-hv specific case is implemented in:
39 kvm_vcpu->halt_poll_ns
41 or in the case of powerpc kvm-hv, in the vcore struct:
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/linux-5.10/tools/perf/scripts/perl/bin/
Dwakeup-latency-report2 # description: system-wide min/max/avg wakeup latency
3 perf script $@ -s "$PERF_EXEC_PATH"/scripts/perl/wakeup-latency.pl
/linux-5.10/Documentation/devicetree/bindings/iio/accel/
Dlis302.txt8 - compatible: should be set to "st,lis3lv02d-spi"
9 - reg: the chipselect index
10 - spi-max-frequency: maximal bus speed, should be set to 1000000 unless
12 - interrupts: the interrupt generated by the device
15 - compatible: should be set to "st,lis3lv02d"
16 - reg: i2c slave address
17 - Vdd-supply: The input supply for Vdd
18 - Vdd_IO-supply: The input supply for Vdd_IO
23 - st,click-single-{x,y,z}: if present, tells the device to issue an
26 - st,click-double-{x,y,z}: if present, tells the device to issue an
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/linux-5.10/drivers/cpuidle/
Dcpuidle-pseries.c1 // SPDX-License-Identifier: GPL-2.0
3 * cpuidle-pseries - idle state cpuidle driver.
78 * were soft-disabled in check_and_cede_processor()
92 * "ibm,get-systems-parameter" RTAS call with the token
98 * table with all the parameters to ibm,get-system-parameters.
99 * CEDE_LATENCY_TOKEN corresponds to the token value for Cede Latency
105 * If the platform supports the cede latency settings information system
109 * a. The first byte is the length “N” of each cede latency setting record minus
112 * b. For each supported cede latency setting a cede latency setting record
115 * -----------------------------
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Ddt_idle_states.c1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "DT idle-states: " fmt
33 idle_state->enter = match_id->data; in init_state_node()
39 idle_state->enter_s2idle = match_id->data; in init_state_node()
41 err = of_property_read_u32(state_node, "wakeup-latency-us", in init_state_node()
42 &idle_state->exit_latency); in init_state_node()
46 err = of_property_read_u32(state_node, "entry-latency-us", in init_state_node()
49 pr_debug(" * %pOF missing entry-latency-us property\n", in init_state_node()
51 return -EINVAL; in init_state_node()
54 err = of_property_read_u32(state_node, "exit-latency-us", in init_state_node()
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/linux-5.10/arch/arm/boot/dts/
Domap3-gta04a3.dts1 // SPDX-License-Identifier: GPL-2.0-only
6 #include "omap3-gta04.dtsi"
18 interrupt-parent = <&gpio3>;
20 Vdd-supply = <&vaux2>;
21 Vdd_IO-supply = <&vaux2>;
23 st,click-single-x;
24 st,click-single-y;
25 st,click-single-z;
26 st,click-thresh-x = <8>;
27 st,click-thresh-y = <8>;
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Dexynos4412.dtsi1 // SPDX-License-Identifier: GPL-2.0
19 #include "exynos4-cpu-thermal.dtsi"
29 fimc-lite0 = &fimc_lite_0;
30 fimc-lite1 = &fimc_lite_1;
35 #address-cells = <1>;
36 #size-cells = <0>;
40 compatible = "arm,cortex-a9";
43 clock-names = "cpu";
44 operating-points-v2 = <&cpu0_opp_table>;
45 #cooling-cells = <2>; /* min followed by max */
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Dsun8i-r16-bananapi-m2m.dts2 * Copyright (c) 2017 Free Electrons <maxime.ripard@free-electrons.com>
4 * This file is dual-licensed: you can use it either under the terms
43 /dts-v1/;
44 #include "sun8i-a33.dtsi"
46 #include <dt-bindings/gpio/gpio.h>
50 compatible = "sinovoip,bananapi-m2m", "allwinner,sun8i-a33";
61 stdout-path = "serial0:115200n8";
65 compatible = "gpio-leds";
68 label = "bpi-m2m:blue:usr";
73 label = "bpi-m2m:green:usr";
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/linux-5.10/tools/perf/bench/
Dfutex-wake-parallel.c1 // SPDX-License-Identifier: GPL-2.0
5 * Block a bunch of threads and let parallel waker threads wakeup an
6 * equal amount of them. The program output reflects the avg latency
27 #include <subcmd/parse-options.h>
47 /* all threads will block on the same futex -- hash bucket chaos ;) */
69 "perf bench futex wake-parallel <options>",
82 waker->nwoken = futex_wake(&futex, nwakes, futex_flag); in waking_workerfn()
83 if (waker->nwoken != nwakes) in waking_workerfn()
84 warnx("couldn't wakeup all tasks (%d/%d)", in waking_workerfn()
85 waker->nwoken, nwakes); in waking_workerfn()
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/linux-5.10/tools/perf/Documentation/
Dperf-sched.txt1 perf-sched(1)
5 ----
6 perf-sched - Tool to trace/measure scheduler properties (latencies)
9 --------
11 'perf sched' {record|latency|map|replay|script|timehist}
14 -----------
20 'perf sched latency' to report the per task scheduling latencies
30 of the workload as it occurred when it was recorded - and can repeat
33 'perf sched map' to print a textual context-switching outline of
35 individual CPUs, and the two-letter shortcuts stand for tasks that
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/linux-5.10/drivers/i2c/busses/
Di2c-omap.c1 // SPDX-License-Identifier: GPL-2.0-or-later
7 * Copyright (C) 2004 - 2007 Texas Instruments.
30 #include <linux/platform_data/i2c-omap.h>
52 /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
103 /* I2C WE wakeup enable register */
105 #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */
106 #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/
107 #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */
108 #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */
109 #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */
[all …]
/linux-5.10/Documentation/trace/
Dftrace.rst2 ftrace - Function Tracer
13 - Written for: 2.6.28-rc2
14 - Updated for: 3.10
15 - Updated for: 4.13 - Copyright 2017 VMware Inc. Steven Rostedt
16 - Converted to rst format - Changbin Du <changbin.du@intel.com>
19 ------------
24 performance issues that take place outside of user-space.
28 There's latency tracing to examine what occurs between interrupts
41 ----------------------
43 See :doc:`ftrace-design` for details for arch porters and such.
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/linux-5.10/drivers/gpu/drm/i915/gt/
Dintel_rc6.c2 * SPDX-License-Identifier: MIT
20 * low-voltage mode when idle, using down to 0V while at this stage. This
26 * among each other with the latency required to enter and leave RC6 and
34 * require higher latency to switch to and wake up.
44 return rc6_to_gt(rc)->uncore; in rc6_to_uncore()
49 return rc6_to_gt(rc)->i915; in rc6_to_i915()
60 struct intel_uncore *uncore = gt->uncore; in gen11_rc6_enable()
73 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10); in gen11_rc6_enable()
86 * it takes us to service a CS interrupt and submit a new ELSP - that in gen11_rc6_enable()
89 * interrupt service latency, the hardware will automatically gate in gen11_rc6_enable()
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/linux-5.10/drivers/cpuidle/governors/
Dteo.c1 // SPDX-License-Identifier: GPL-2.0
17 * Of course, non-timer wakeup sources are more important in some use cases and
28 * - Find an idle state on the basis of the sleep length and state statistics
42 * - If the majority of the most recent idle duration values are below the
63 * the detection of wakeup patterns.
68 * struct teo_idle_state - Idle state data used by the TEO cpuidle governor.
73 * A CPU wakeup is "matched" by a given idle state if the idle duration measured
74 * after the wakeup is between the target residency of that state and the target
76 * "matches" a CPU wakeup when the measured idle duration is at least equal to
79 * Also, from the TEO governor perspective, a CPU wakeup from idle is "early" if
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Dmenu.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * menu.c - the menu idle governor
5 * Copyright (C) 2006-2007 Adam Belay <abelay@novell.com>
36 * 3) Latency tolerance (from pmqos infrastructure)
40 * -----------------------
68 * Repeatable-interval-detector
69 * ----------------------------
79 * ---------------------------
88 * This rule-of-thumb is implemented using a performance-multiplier:
89 * If the exit latency times the performance multiplier is longer than
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/linux-5.10/kernel/locking/
Dlock_events_list.h1 /* SPDX-License-Identifier: GPL-2.0 */
28 LOCK_EVENT(pv_latency_kick) /* Average latency (ns) of vCPU kick */
29 LOCK_EVENT(pv_latency_wake) /* Average latency (ns) of kick-to-wakeup */
31 LOCK_EVENT(pv_spurious_wakeup) /* # of spurious wakeups in non-head vCPUs */
35 LOCK_EVENT(pv_wait_node) /* # of vCPU wait's at non-head queue node */
59 LOCK_EVENT(rwsem_opt_rlock) /* # of opt-acquired read locks */
60 LOCK_EVENT(rwsem_opt_wlock) /* # of opt-acquired write locks */
63 LOCK_EVENT(rwsem_opt_norspin) /* # of disabled reader-only optspins */
64 LOCK_EVENT(rwsem_opt_rlock2) /* # of opt-acquired 2ndary read locks */
/linux-5.10/Documentation/driver-api/pm/
Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
18 cores) is idle after an interrupt or equivalent wakeup event, which means that
89 code, and that causes the kernel to run the architecture-specific
91 until the ``->enable()`` governor callback is invoked for that CPU
103 It is expected to reverse any changes made by the ``->enable()``
143 selection made by the ``->select()`` callback (when it was invoked last
148 quality of service (PM QoS) constraints on the processor wakeup latency into
150 PM QoS wakeup latency constraint for a given CPU, a ``CPUIdle`` governor is
152 :c:func:`cpuidle_governor_latency_req()`. Then, the governor's ``->select()``
190 state to start executing the first instruction after a wakeup from it,
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/linux-5.10/arch/arm64/boot/dts/sprd/
Dsc9860.dtsi6 * SPDX-License-Identifier: (GPL-2.0+ OR MIT)
9 #include <dt-bindings/interrupt-controller/arm-gic.h>
10 #include <dt-bindings/input/input.h>
11 #include <dt-bindings/gpio/gpio.h>
16 #address-cells = <2>;
17 #size-cells = <0>;
19 cpu-map {
53 compatible = "arm,cortex-a53";
55 enable-method = "psci";
56 cpu-idle-states = <&CORE_PD &CLUSTER_PD>;
[all …]
/linux-5.10/kernel/trace/
Dtrace_sched_wakeup.c1 // SPDX-License-Identifier: GPL-2.0
3 * trace task wakeup timings
5 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
10 * Copyright (C) 2004-2006 Ingo Molnar
28 static unsigned wakeup_prio = -1;
44 # define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
54 * Prologue for the wakeup function tracers.
57 * is disabled and data->disabled is incremented.
59 * is not disabled and data->disabled is
85 *data = per_cpu_ptr(tr->array_buffer.data, cpu); in func_prolog_preempt_disable()
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