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/kernel/linux/linux-5.10/tools/perf/util/
Drecord.c1 // SPDX-License-Identifier: GPL-2.0
6 #include "parse-events.h"
11 #include <subcmd/parse-options.h>
16 #include "../perf-sys.h"
20 * evsel__config_leader_sampling() uses special rules for leader sampling.
26 struct evsel *leader = evsel->leader; in evsel__read_sampler()
30 if (evsel->leader == leader && evsel != evsel->leader) in evsel__read_sampler()
41 struct list_head *config_terms = &evsel->config_terms; in evsel__config_term_mask()
45 term_types |= 1 << term->type; in evsel__config_term_mask()
52 struct perf_event_attr *attr = &evsel->core.attr; in evsel__config_leader_sampling()
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/kernel/linux/linux-5.10/Documentation/driver-api/media/drivers/
Dcx88-devel.rst1 .. SPDX-License-Identifier: GPL-2.0
9 -------------------------------------------
13 .. code-block:: none
16 Digit 8: 31-28
19 Digit 7: 27-24 (0xc = 12 = b1100 )
24 Digits 6,5: 23-16
25 25-16: COMB_RANGE = 0x1f [default] (9 bits -> max 512)
27 Digit 4: 15-12
33 Digit 3: 11-8
39 Digit 2: 7-4
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/kernel/linux/linux-5.10/Documentation/devicetree/bindings/iio/adc/
Dadi,ad7606.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Analog Devices AD7606 Simultaneous Sampling ADC
10 - Beniamin Bia <beniamin.bia@analog.com>
11 - Stefan Popa <stefan.popa@analog.com>
14 Analog Devices AD7606 Simultaneous Sampling ADC
15 https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606_7606-6_7606-4.pdf
16 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7606B.pdf
17 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7616.pdf
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/kernel/linux/linux-5.10/sound/soc/codecs/
Dssm2602.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
81 #define APDIGI_DE_EMPHASIS 0x006 /* De-Emphasis Control …
105 /*Sampling Control (SSM2602_REG_SAMPLING_CTRL)*/
107 #define SRATE_BOS_RATE 0x002 /* Base Over-Sampling rate …
108 #define SRATE_SAMPLE_RATE 0x03C /* Clock setting condition (Sampling rate control)…
/kernel/linux/linux-5.10/include/uapi/linux/
Dgen_stats.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
19 #define TCA_STATS_MAX (__TCA_STATS_MAX - 1)
22 * struct gnet_stats_basic - byte/packet throughput statistics
32 * struct gnet_stats_rate_est - rate estimator
42 * struct gnet_stats_rate_est64 - rate estimator
52 * struct gnet_stats_queue - queuing statistics
57 * @overlimits: number of enqueues over the limit
68 * struct gnet_estimator - rate estimator configuration
69 * @interval: sampling period
/kernel/linux/linux-5.10/net/ipv4/
Dtcp_bbr.c21 * +---> STARTUP ----+
24 * | DRAIN ----+
27 * +---> PROBE_BW ----+
30 * | +----+ |
32 * +---- PROBE_RTT <--+
37 * A long-lived BBR flow spends the vast majority of its time remaining
42 * it briefly enters PROBE_RTT to cut inflight to a minimum value to re-probe
43 * the path's two-way propagation delay (min_rtt). When exiting PROBE_RTT, if
48 * "BBR: Congestion-Based Congestion Control",
50 * Van Jacobson. ACM Queue, Vol. 14 No. 5, September-October 2016.
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Dtcp_rate.c1 // SPDX-License-Identifier: GPL-2.0-only
9 * for this flow, calculated over the time interval between the transmission
12 * Specifically, over the interval between each transmit and corresponding ACK,
21 * send_rate = #pkts_delivered/(last_snd_time - first_snd_time)
22 * ack_rate = #pkts_delivered/(last_ack_time - first_ack_time)
28 * deliberately avoids using the inter-packet spacing approach because that
31 * TCP flows can often be application-limited in request/response workloads.
32 * The estimator marks a bandwidth sample as application-limited if there
46 * the full time the network needs to deliver all in-flight in tcp_rate_skb_sent()
49 * able to deliver those packets completely in the sampling in tcp_rate_skb_sent()
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/kernel/linux/linux-5.10/kernel/trace/
Dtrace_hwlat.c1 // SPDX-License-Identifier: GPL-2.0
3 * trace_hwlat.c - A simple Hardware Latency detector.
20 * Although certain hardware-inducing latencies are necessary (for example,
22 * and remote management) they can wreak havoc upon any OS-level performance
23 * guarantees toward low-latency, especially when the OS is not even made
27 * sampling the built-in CPU timer, looking for discontiguous readings.
31 * environment requiring any kind of low-latency performance
34 * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com>
35 * Copyright (C) 2013-2016 Steven Rostedt, Red Hat, Inc. <srostedt@redhat.com>
57 /* sampling thread*/
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/kernel/linux/linux-5.10/Documentation/devicetree/bindings/sound/
Dnvidia,tegra186-dspk.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/nvidia,tegra186-dspk.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 Density Modulation (PDM) transmitter that up-samples the input to
12 the desired sampling rate by interpolation and then converts the
13 over sampled Pulse Code Modulation (PCM) input to the desired 1-bit
17 - Jon Hunter <jonathanh@nvidia.com>
18 - Sameer Pujar <spujar@nvidia.com>
22 pattern: "^dspk@[0-9a-f]*$"
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Drenesas,rsnd.txt1 Renesas R-Car sound
7 Renesas R-Car and RZ/G sound is constructed from below modules
10 SCU : Sampling Rate Converter Unit
11 - SRC : Sampling Rate Converter
12 - CMD
13 - CTU : Channel Transfer Unit
14 - MIX : Mixer
15 - DVC : Digital Volume and Mute Function
25 Multi channel is supported by Multi-SSI, or TDM-SSI.
27 Multi-SSI : 6ch case, you can use stereo x 3 SSI
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/kernel/linux/linux-5.10/drivers/cpufreq/
Dcpufreq_governor.c1 // SPDX-License-Identifier: GPL-2.0-only
30 * store_sampling_rate - update sampling rate effective immediately if needed.
34 * original sampling_rate was 1 second and the requested new sampling rate is 10
37 * change the sampling rate too late; up to 1 second later. Thus, if we are
38 * reducing the sampling rate, we need to make the new value effective
41 * This must be called with dbs_data->mutex held, otherwise traversing
54 return -EINVAL; in store_sampling_rate()
56 dbs_data->sampling_rate = sampling_interval; in store_sampling_rate()
59 * We are operating under dbs_data->mutex and so the list and its in store_sampling_rate()
62 list_for_each_entry(policy_dbs, &attr_set->policy_list, list) { in store_sampling_rate()
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/kernel/linux/linux-5.10/drivers/iio/pressure/
Dzpa2326.c1 // SPDX-License-Identifier: GPL-2.0-only
18 * ZPA2326 hardware supports 2 sampling mode: one shot and continuous.
20 * A complete one shot sampling cycle gets device out of low power mode,
22 * back to low power mode. It is meant for on demand sampling with optimal power
23 * saving at the cost of lower sampling rate and higher software overhead.
34 * - get device out of low power mode,
35 * - setup hardware sampling period,
36 * - at end of period, upon data ready interrupt: pop pressure samples out of
38 * - when no longer needed, stop sampling process by putting device into
44 * Note that hardware sampling frequency is taken into account only when
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/kernel/linux/linux-5.10/drivers/media/rc/
Dmtk-cir.c1 // SPDX-License-Identifier: GPL-2.0-or-later
13 #include <media/rc-core.h>
24 * Register to setting ok count whose unit based on hardware sampling period
59 /* Register to setting software sampling period */
61 /* Register to setting hardware sampling period */
97 * struct mtk_ir_data - This is the structure holding all differences among
104 * @hw_period: The value indicating the hardware sampling period
125 * struct mtk_ir - This is the main datasructure for holding the state
147 return ir->data->regs[MTK_CHKDATA_REG] + 4 * i; in mtk_chkdata_reg()
156 * unit of raw software sampling in mtk_chk_period()
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/kernel/linux/linux-5.10/tools/perf/Documentation/
Dperf-top.txt1 perf-top(1)
5 ----
6 perf-top - System profiling tool.
9 --------
11 'perf top' [-e <EVENT> | --event=EVENT] [<options>]
14 -----------
19 -------
20 -a::
21 --all-cpus::
22 System-wide collection. (default)
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Dtopdown.txt2 -----------------------------------
13 perf stat --topdown implements this.
27 % perf stat -a --topdown -I1000
94 int slots_fd = perf_event_open(&slots, 0, -1, -1, 0);
109 int metrics_fd = perf_event_open(&metrics, 0, -1, slots_fd, 0);
188 retiring_slots = GET_METRIC(metric_b, 0) * slots_b - retiring_slots_a
189 bad_spec_slots = GET_METRIC(metric_b, 1) * slots_b - bad_spec_slots_a
190 fe_bound_slots = GET_METRIC(metric_b, 2) * slots_b - fe_bound_slots_a
191 be_bound_slots = GET_METRIC(metric_b, 3) * slots_b - be_bound_slots_a
196 slots_delta = slots_b - slots_a
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/kernel/linux/linux-5.10/Documentation/admin-guide/
Dcpu-load.rst10 Linux 2.6.18.3-exp (linmac) 02/20/2007
12 avg-cpu: %user %nice %system %iowait %steal %idle
17 Here the system thinks that over the default sampling period the
34 -------
40 |--------------------------------------|
55 /* gcc -o hog smallhog.c */
73 while (!stop && --niters);
91 for (i = 0; i < HIST; ++i) v[i] = ULONG_MAX - hog(ULONG_MAX);
94 n = tmp - (tmp / 3.0);
108 ----------
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/kernel/linux/linux-5.10/Documentation/admin-guide/hw-vuln/
Dspecial-register-buffer-data-sampling.rst1 .. SPDX-License-Identifier: GPL-2.0
3 SRBDS - Special Register Buffer Data Sampling
17 -------------------
18 Core models (desktop, mobile, Xeon-E3) that implement RDRAND and/or RDSEED may
47 ------------
52 CVE-2020-0543 SRBDS Special Register Buffer Data Sampling
56 ----------------
62 --------------------
68 During execution of the RDRAND, RDSEED, or EGETKEY instructions, off-core
83 legacy locked cache-line-split accesses.
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/kernel/linux/linux-5.10/Documentation/usb/
Dgadget-testing.rst37 Function-specific configfs interface
38 ------------------------------------
45 The attribute is read-only.
51 ------------------------
76 Function-specific configfs interface
77 ------------------------------------
87 Ethernet over USB link
89 Ethernet over USB link
95 configuration. The ifname is read-only and contains the name of the interface
99 ------------------------
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/kernel/linux/linux-5.10/sound/firewire/
Damdtp-stream.h1 /* SPDX-License-Identifier: GPL-2.0 */
10 #include "packets-buffer.h"
13 * enum cip_flags - describes details of the streaming protocol
14 * @CIP_NONBLOCKING: In non-blocking mode, each packet contains
16 * for clock skew and left-over fractional samples. This should
21 * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
24 * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
26 * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
28 * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
30 * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
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/kernel/linux/linux-5.10/Documentation/userspace-api/media/v4l/
Dvidioc-cropcap.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_CROPCAP - Information about the video cropping and scaling abilities
43 support cropping and/or scaling and/or have non-square pixels, and for
50 .. flat-table:: struct v4l2_cropcap
51 :header-rows: 0
52 :stub-columns: 0
55 * - __u32
56 - ``type``
57 - Type of the data stream, set by the application. Only these types
61 * - struct :ref:`v4l2_rect <v4l2-rect-crop>`
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/kernel/linux/linux-5.10/sound/soc/tegra/
Dtegra20_spdif.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * tegra20_spdif.h - Definitions for Tegra20 SPDIF driver
6 * Copyright (C) 2011 - NVIDIA, Inc.
9 * Copyright (c) 2008-2009, NVIDIA Corporation
169 /* B-preamble detection status: 0=not detected, 1=B-preamble detected */
210 * bi-phase period.
215 /* Data strobe mode: 0=Auto-locked 1=Manual locked */
219 * Manual data strobe time within the bi-phase clock period (in terms of
220 * the number of over-sampling clocks).
226 * Manual SPDIFIN bi-phase clock period (in terms of the number of
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/kernel/linux/linux-5.10/Documentation/trace/coresight/
Dcoresight-cpu-debug.rst9 ------------
11 Coresight CPU debug module is defined in ARMv8-a architecture reference manual
13 debug module and it is mainly used for two modes: self-hosted debug and
16 explore debugging method which rely on self-hosted debug mode, this document
19 The debug module provides sample-based profiling extension, which can be used
21 every CPU has one dedicated debug module to be connected. Based on self-hosted
29 --------------
31 - During driver registration, it uses EDDEVID and EDDEVID1 - two device ID
32 registers to decide if sample-based profiling is implemented or not. On some
36 - At the time this documentation was written, the debug driver mainly relies on
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/kernel/linux/linux-5.10/arch/arm/boot/dts/
Dstm32mp157c-ed1.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * Copyright (C) STMicroelectronics 2017 - All Rights Reserved
6 /dts-v1/;
10 #include "stm32mp15-pinctrl.dtsi"
11 #include "stm32mp15xxaa-pinctrl.dtsi"
12 #include <dt-bindings/gpio/gpio.h>
13 #include <dt-bindings/mfd/st,stpmic1.h>
17 compatible = "st,stm32mp157c-ed1", "st,stm32mp157";
20 stdout-path = "serial0:115200n8";
28 reserved-memory {
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/kernel/linux/linux-5.10/arch/arm/mach-ebsa110/
Dcore.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mach-ebsa110/core.c
5 * Copyright (C) 1998-2001 Russell King
7 * Extra MM routines for the EBSA-110 architecture
19 #include <asm/mach-types.h>
33 __raw_writeb(1 << d->irq, IRQ_MCLR); in ebsa110_mask_irq()
38 __raw_writeb(1 << d->irq, IRQ_MSET); in ebsa110_unmask_irq()
70 * sparse external-decode ISAIO space
95 * self-decode ISAIO space
137 * This was measured on a 10 digit frequency counter sampling
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/kernel/linux/linux-5.10/sound/soc/intel/atom/
Dsst-mfld-dsp.h1 /* SPDX-License-Identifier: GPL-2.0-only */
5 * sst_mfld_dsp.h - Intel SST Driver for audio engine
7 * Copyright (C) 2008-14 Intel Corporation
31 /* Bits B7: SST or IA/SC ; B6-B4: Msg Category; B3-B0: Msg Type */
104 #define IPC_SST_ERROR_EVENT 0x99 /* Buffer over run occurred */
120 /* Buffer under-run */
126 * - IPC High: pvt_id is set to zero. Always short message.
127 * - msg_id is in lower 16-bits of IPC low payload.
128 * - pipe_id is in higher 16-bits of IPC low payload for period_elapsed.
129 * - error id is in higher 16-bits of IPC low payload for async errors.
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