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/openbmc/linux/Documentation/devicetree/bindings/cpu/
H A Didle-states.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/cpu/idle-states.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
11 - Anup Patel <anup@brainfault.org>
15 1 - Introduction
18 ARM and RISC-V systems contain HW capable of managing power consumption
19 dynamically, where cores can be put in different low-power states (ranging
22 run-time, can be specified through device tree bindings representing the
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/openbmc/linux/Documentation/arch/arm/omap/
H A 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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/openbmc/linux/Documentation/ABI/testing/
H A 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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/openbmc/linux/Documentation/devicetree/bindings/net/
H A 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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/openbmc/linux/tools/perf/scripts/perl/bin/
H A Dwakeup-latency-report2 # description: system-wide min/max/avg wakeup latency
3 perf script $@ -s "$PERF_EXEC_PATH"/scripts/perl/wakeup-latency.pl
/openbmc/linux/Documentation/virt/kvm/
H A 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 dependent. 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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/openbmc/linux/Documentation/admin-guide/pm/
H A 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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H A 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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/openbmc/linux/Documentation/devicetree/bindings/iio/accel/
H A 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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/openbmc/linux/arch/arm/boot/dts/ti/omap/
H A 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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/openbmc/linux/drivers/cpuidle/
H A Ddt_idle_states.c1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "DT idle-states: " fmt
32 idle_state->enter = match_id->data; in init_state_node()
38 idle_state->enter_s2idle = match_id->data; in init_state_node()
40 err = of_property_read_u32(state_node, "wakeup-latency-us", in init_state_node()
41 &idle_state->exit_latency); in init_state_node()
45 err = of_property_read_u32(state_node, "entry-latency-us", in init_state_node()
48 pr_debug(" * %pOF missing entry-latency-us property\n", in init_state_node()
50 return -EINVAL; in init_state_node()
53 err = of_property_read_u32(state_node, "exit-latency-us", in init_state_node()
[all …]
H A Dcpuidle-pseries.c1 // SPDX-License-Identifier: GPL-2.0
3 * cpuidle-pseries - idle state cpuidle driver.
47 dev->poll_time_limit = false; in snooze_loop()
58 dev->poll_time_limit = true; in snooze_loop()
80 * were soft-disabled in check_and_cede_processor()
94 * "ibm,get-systems-parameter" RTAS call with the token
100 * table with all the parameters to ibm,get-system-parameters.
101 * CEDE_LATENCY_TOKEN corresponds to the token value for Cede Latency
107 * If the platform supports the cede latency settings information system
111 * a. The first byte is the length “N” of each cede latency setting record minus
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/openbmc/linux/Documentation/tools/rtla/
H A Dcommon_timerlat_description.rst2 *timerlat* tracer dispatches a kernel thread per-cpu. These threads
4 the wakeup, they collect and generate useful information for the
5 debugging of operating system timer latency.
8 prints the timer latency at the timer *IRQ* handler and the *Thread*
H A Drtla-timerlat-top.rst2 rtla-timerlat-top
4 -------------------------------------------
5 Measures the operating system timer latency
6 -------------------------------------------
22 seem with the option **-T**.
35 **--aa-only** *us*
38 Print the auto-analysis if the system hits the stop tracing condition. This option
45 In the example below, the timerlat tracer is dispatched in cpus *1-23* in the
46 automatic trace mode, instructing the tracer to stop if a *40 us* latency or
49 # timerlat -a 40 -c 1-23 -q
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/openbmc/linux/Documentation/trace/
H A Dtimerlat-tracer.rst6 find sources of wakeup latencies of real-time threads. Like cyclictest,
8 computes a *wakeup latency* value as the difference between the *current
13 -----
28 # _-----=> irqs-off
29 # / _----=> need-resched
30 # | / _---=> hardirq/softirq
31 # || / _--=> preempt-depth
34 # TASK-PID CPU# |||| TIMESTAMP ID CONTEXT LATENCY
36 <idle>-0 [000] d.h1 54.029328: #1 context irq timer_latency 932 ns
37 <...>-867 [000] .... 54.029339: #1 context thread timer_latency 11700 ns
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H A 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 Documentation/trace/ftrace-design.rst for details for arch porters and such.
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/openbmc/u-boot/arch/arm/dts/
H A Dfsl-imx8-ca53.dtsi17 #address-cells = <2>;
18 #size-cells = <0>;
20 idle-states {
21 entry-method = "psci";
23 CPU_SLEEP: cpu-sleep {
24 compatible = "arm,idle-state";
25 local-timer-stop;
26 arm,psci-suspend-param = <0x0000000>;
27 entry-latency-us = <700>;
28 exit-latency-us = <250>;
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/openbmc/linux/drivers/cpuidle/governors/
H A Dteo.c1 // SPDX-License-Identifier: GPL-2.0
6 * Copyright (C) 2018 - 2021 Intel Corporation
9 * Util-awareness mechanism:
15 * DOC: teo-description
27 * Of course, non-timer wakeup sources are more important in some use cases
54 * sleep length and the idle duration measured after CPU wakeup fall into the
67 * steps (modulo the possible latency constraint that must be taken into account
74 * - The sum of the "hits" and "intercepts" metrics for the candidate state
79 * - The sum of the "intercepts" metrics for all of the idle states shallower
84 * - The sum of the numbers of recent intercepts for all of the idle states
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/openbmc/linux/tools/perf/bench/
H A 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
28 #include <subcmd/parse-options.h>
48 /* all threads will block on the same futex -- hash bucket chaos ;) */
73 "perf bench futex wake-parallel <options>",
86 waker->nwoken = futex_wake(&futex, nwakes, futex_flag); in waking_workerfn()
87 if (waker->nwoken != nwakes) in waking_workerfn()
88 warnx("couldn't wakeup all tasks (%d/%d)", in waking_workerfn()
89 waker->nwoken, nwakes); in waking_workerfn()
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/openbmc/linux/drivers/base/power/
H A Ddomain_governor.c1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/base/power/domain_governor.c - Governors for device PM domains.
20 if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { in dev_update_qos_constraint()
21 struct gpd_timing_data *td = dev_gpd_data(dev)->td; in dev_update_qos_constraint()
24 * Only take suspend-time QoS constraints of devices into in dev_update_qos_constraint()
30 constraint_ns = td ? td->effective_constraint_ns : in dev_update_qos_constraint()
50 * default_suspend_ok - Default PM domain governor routine to suspend devices.
55 struct gpd_timing_data *td = dev_gpd_data(dev)->td; in default_suspend_ok()
61 spin_lock_irqsave(&dev->power.lock, flags); in default_suspend_ok()
63 if (!td->constraint_changed) { in default_suspend_ok()
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/openbmc/linux/tools/perf/Documentation/
H A 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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/openbmc/linux/drivers/i2c/busses/
H A 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 */
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/openbmc/linux/kernel/trace/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
21 API, which will be used by other function-entry hooking
27 See Documentation/trace/ftrace-design.rst
32 See Documentation/trace/ftrace-design.rst
40 See Documentation/trace/ftrace-design.rst
69 See Documentation/trace/ftrace-design.rst
74 See Documentation/trace/ftrace-design.rst
79 Arch supports the gcc options -pg with -mfentry
84 Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount
89 Arch supports objtool --mcount
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/openbmc/linux/arch/arm64/boot/dts/freescale/
H A Dimx8dxl.dtsi1 // SPDX-License-Identifier: GPL-2.0+
6 #include <dt-bindings/clock/imx8-clock.h>
7 #include <dt-bindings/firmware/imx/rsrc.h>
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/interrupt-controller/arm-gic.h>
10 #include <dt-bindings/input/input.h>
11 #include <dt-bindings/pinctrl/pads-imx8dxl.h>
12 #include <dt-bindings/thermal/thermal.h>
15 interrupt-parent = <&gic>;
16 #address-cells = <2>;
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/openbmc/linux/kernel/locking/
H A 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_lock) /* # of opt-acquired write locks */

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