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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/devicetree/bindings/power/
H A Ddomain-idle-state.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/domain-idle-state.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Ulf Hansson <ulf.hansson@linaro.org>
18 const: domain-idle-states
21 "^(cpu|cluster|domain)-":
29 const: domain-idle-state
31 entry-latency-us:
33 The worst case latency in microseconds required to enter the idle
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H A Dpower-domain.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/power-domain.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
24 \#power-domain-cells property in the PM domain provider node.
28 pattern: "^(power-controller|power-domain)([@-].*)?$"
30 domain-idle-states:
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/openbmc/linux/tools/tracing/rtla/src/
H A Dtimerlat_top.c1 // SPDX-License-Identifier: GPL-2.0
78 * timerlat_free_top - free runtime data
83 free(data->cpu_data); in timerlat_free_top()
88 * timerlat_alloc_histogram - alloc runtime data
99 data->nr_cpus = nr_cpus; in timerlat_alloc_top()
102 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in timerlat_alloc_top()
103 if (!data->cpu_data) in timerlat_alloc_top()
108 data->cpu_data[cpu].min_irq = ~0; in timerlat_alloc_top()
109 data->cpu_data[cpu].min_thread = ~0; in timerlat_alloc_top()
110 data->cpu_data[cpu].min_user = ~0; in timerlat_alloc_top()
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H A Dtimerlat_hist.c1 // SPDX-License-Identifier: GPL-2.0
86 * timerlat_free_histogram - free runtime data
94 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in timerlat_free_histogram()
95 if (data->hist[cpu].irq) in timerlat_free_histogram()
96 free(data->hist[cpu].irq); in timerlat_free_histogram()
98 if (data->hist[cpu].thread) in timerlat_free_histogram()
99 free(data->hist[cpu].thread); in timerlat_free_histogram()
101 if (data->hist[cpu].user) in timerlat_free_histogram()
102 free(data->hist[cpu].user); in timerlat_free_histogram()
107 if (data->hist) in timerlat_free_histogram()
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H A Dtimerlat_aa.c1 // SPDX-License-Identifier: GPL-2.0
25 * Per-cpu data statistics and data.
31 /* timerlat IRQ latency */
36 /* timerlat Thread latency */
66 * If now - timestamp is <= latency, it might have influenced
67 * in the timerlat irq latency. Otherwise, ignore it.
137 * timerlat_aa_get_data - Get the per-cpu data from the timerlat context
142 return &taa_ctx->taa_data[cpu]; in timerlat_aa_get_data()
146 * timerlat_aa_irq_latency - Handles timerlat IRQ event
156 taa_data->curr_state = TIMERLAT_WAITING_THREAD; in timerlat_aa_irq_latency()
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/openbmc/linux/Documentation/devicetree/bindings/thermal/
H A Dthermal-idle.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-idle.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Daniel Lezcano <daniel.lezcano@linaro.org>
22 const: thermal-idle
24 A thermal-idle node describes the idle cooling device properties to
27 '#cooling-cells':
31 the cooling-maps reference. The first cell is the minimum cooling state
34 duration-us:
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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/Documentation/tools/rtla/
H A Dcommon_timerlat_options.rst1 **-a**, **--auto** *us*
4 while debugging the system. It is equivalent to use **-T** *us* **-s** *us*
5 **-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads,
6 thus equilavent to **-P** *f:95*.
8 **-p**, **--period** *us*
12 **-i**, **--irq** *us*
14 Stop trace if the *IRQ* latency is higher than the argument in us.
16 **-T**, **--thread** *us*
18 Stop trace if the *Thread* latency is higher than the argument in us.
20 **-s**, **--stack** *us*
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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/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()
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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/devicetree/bindings/arm/
H A Dpsci.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
15 processors") can be used by Linux to initiate various CPU-centric power
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
40 - description:
44 - description:
52 - const: arm,psci-0.2
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/openbmc/linux/Documentation/devicetree/bindings/arm/msm/
H A Dqcom,idle-state.txt3 ARM provides idle-state node to define the cpuidle states, as defined in [1].
4 cpuidle-qcom is the cpuidle driver for Qualcomm SoCs and uses these idle
5 states. Idle states have different enter/exit latency and residency values.
6 The idle states supported by the QCOM SoC are defined as -
31 state. Retention may have a slightly higher latency than Standby.
44 code in the EL for the SoC. On SoCs with write-back L1 cache, the cache has to
50 be flushed, system bus, clocks - lowered, and SoC main XO clock gated and
52 power modes possible at this state is vast, the exit latency and the residency
58 The idle-state for QCOM SoCs are distinguished by the compatible property of
59 the idle-states device node.
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/openbmc/linux/arch/arm64/boot/dts/qcom/
H A Dsm4450.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
6 #include <dt-bindings/gpio/gpio.h>
7 #include <dt-bindings/interrupt-controller/arm-gic.h>
10 interrupt-parent = <&intc>;
12 #address-cells = <2>;
13 #size-cells = <2>;
18 xo_board: xo-board {
19 compatible = "fixed-clock";
20 clock-frequency = <76800000>;
21 #clock-cells = <0>;
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H A Dsdx75.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
9 #include <dt-bindings/clock/qcom,rpmh.h>
10 #include <dt-bindings/clock/qcom,sdx75-gcc.h>
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/power/qcom,rpmhpd.h>
13 #include <dt-bindings/power/qcom-rpmpd.h>
14 #include <dt-bindings/soc/qcom,rpmh-rsc.h>
17 #address-cells = <2>;
18 #size-cells = <2>;
19 interrupt-parent = <&intc>;
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H A Dsc7180-firmware-tfa.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
4 * Devices that use SC7180 with TrustedFirmware-A
10 /delete-property/ power-domains;
11 /delete-property/ power-domain-names;
13 cpu-idle-states = <&LITTLE_CPU_SLEEP_0
19 /delete-property/ power-domains;
20 /delete-property/ power-domain-names;
22 cpu-idle-states = <&LITTLE_CPU_SLEEP_0
28 /delete-property/ power-domains;
29 /delete-property/ power-domain-names;
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/openbmc/linux/tools/testing/selftests/ftrace/test.d/preemptirq/
H A Dirqsoff_tracer.tc2 # SPDX-License-Identifier: GPL-2.0
46 grep -q "tracer: preemptoff" trace || fail
49 grep -E -q "5.....us : <stack trace>" trace || fail
51 # Check for 500ms of latency
52 grep -E -q "latency: 5..... us" trace || fail
69 grep -q "tracer: irqsoff" trace || fail
72 grep -E -q "5.....us : <stack trace>" trace || fail
74 # Check for 500ms of latency
75 grep -E -q "latency: 5..... us" trace || fail
78 exit 0
/openbmc/linux/drivers/cpuidle/governors/
H A 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>
38 * 3) Latency tolerance (from pmqos infrastructure)
42 * -----------------------
43 * C state entry and exit have an energy cost, and a certain amount of time in
45 * provides us this duration in the "target_residency" field. So all that we
70 * Repeatable-interval-detector
71 * ----------------------------
81 * ---------------------------
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/openbmc/linux/tools/testing/selftests/dma/
H A Ddma_map_benchmark.c1 // SPDX-License-Identifier: GPL-2.0-only
29 int threads = 1, seconds = 20, node = -1; in main()
38 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) { in main()
62 return -1; in main()
67 fprintf(stderr, "invalid number of threads, must be in 1-%d\n", in main()
69 exit(1); in main()
73 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n", in main()
75 exit(1); in main()
79 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n", in main()
81 exit(1); in main()
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/openbmc/linux/tools/testing/selftests/bpf/benchs/
H A Dbench_local_storage_rcu_tasks_trace.c1 // SPDX-License-Identifier: GPL-2.0
72 fprintf(stderr, "benchmark doesn't support multi-producer!\n"); in validate()
73 exit(1); in validate()
77 exit(1); in validate()
83 exit(1); in validate()
94 return -1; in kthread_pid_ticks()
112 exit(1); in kthread_pid_ticks()
169 if (!bpf_program__attach(ctx.skel->progs.get_local)) { in local_storage_tasks_trace_setup()
174 if (!bpf_program__attach(ctx.skel->progs.pregp_step)) { in local_storage_tasks_trace_setup()
179 if (!bpf_program__attach(ctx.skel->progs.postgp)) { in local_storage_tasks_trace_setup()
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/openbmc/linux/Documentation/trace/
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/linux/arch/arm64/boot/dts/arm/
H A Djuno-r2.dts9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
14 #include "juno-cs-r1r2.dtsi"
18 compatible = "arm,juno-r2", "arm,juno", "arm,vexpress";
19 interrupt-parent = <&gic>;
20 #address-cells = <2>;
21 #size-cells = <2>;
28 stdout-path = "serial0:115200n8";
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H A Djuno.dts4 * Copyright (c) 2013-2014 ARM Ltd.
9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
18 interrupt-parent = <&gic>;
19 #address-cells = <2>;
20 #size-cells = <2>;
27 stdout-path = "serial0:115200n8";
31 compatible = "arm,psci-0.2";
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H A Djuno-r1.dts9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
14 #include "juno-cs-r1r2.dtsi"
18 compatible = "arm,juno-r1", "arm,juno", "arm,vexpress";
19 interrupt-parent = <&gic>;
20 #address-cells = <2>;
21 #size-cells = <2>;
28 stdout-path = "serial0:115200n8";
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