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Message-ID: <CANLsYkwzsVT38KG29DbWQySHXoLhnhVbbuMwVOninvVKmhKC2w@mail.gmail.com>
Date: Thu, 11 Jul 2019 10:18:29 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Phong Tran <tranmanphong@...il.com>
Cc: Jon Corbet <corbet@....net>, Leo Yan <leo.yan@...aro.org>,
mchehab@...nel.org,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
linux-kernel-mentees@...ts.linuxfoundation.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
skhan@...uxfoundation.org,
"Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: Re: [Patch V4] Documentation: coresight: covert txt to rst
On Wed, 10 Jul 2019 at 09:01, Phong Tran <tranmanphong@...il.com> wrote:
>
> as doc-guide of kernel documentation, use Sphinx tool to
> generate the html/pdf... files.
>
> This changes the plan text txt to rst format.
>
I agree with Mauro - although the changelong has already been improved
it is still below the minimum requirements.
> Signed-off-by: Phong Tran <tranmanphong@...il.com>
As for the content of the patch:
Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
> ChangeLog:
> V2: review points from Mathieu, Jonathan
> * Add coresight-cpu-debug
> * Update MAINTAINERS file
> * Avoid use markup as much as posible
> V3: review points from Mauro
> * add the colon author, date
> * change to use ```` in the struct
> * add line for the acronyms
> V4:
> * Rebase on linux-next tree
> ---
> ...sight-cpu-debug.txt => coresight-cpu-debug.rst} | 67 ++--
> .../trace/{coresight.txt => coresight.rst} | 372 +++++++++++----------
> Documentation/trace/index.rst | 2 +
> MAINTAINERS | 4 +-
> 4 files changed, 234 insertions(+), 211 deletions(-)
> rename Documentation/trace/{coresight-cpu-debug.txt => coresight-cpu-debug.rst} (84%)
> rename Documentation/trace/{coresight.txt => coresight.rst} (56%)
>
> diff --git a/Documentation/trace/coresight-cpu-debug.txt b/Documentation/trace/coresight-cpu-debug.rst
> similarity index 84%
> rename from Documentation/trace/coresight-cpu-debug.txt
> rename to Documentation/trace/coresight-cpu-debug.rst
> index 1a660a39e3c0..993dd294b81b 100644
> --- a/Documentation/trace/coresight-cpu-debug.txt
> +++ b/Documentation/trace/coresight-cpu-debug.rst
> @@ -1,8 +1,9 @@
> - Coresight CPU Debug Module
> - ==========================
> +==========================
> +Coresight CPU Debug Module
> +==========================
>
> - Author: Leo Yan <leo.yan@...aro.org>
> - Date: April 5th, 2017
> + :Author: Leo Yan <leo.yan@...aro.org>
> + :Date: April 5th, 2017
>
> Introduction
> ------------
> @@ -69,6 +70,7 @@ Before accessing debug registers, we should ensure the clock and power domain
> have been enabled properly. In ARMv8-a ARM (ARM DDI 0487A.k) chapter 'H9.1
> Debug registers', the debug registers are spread into two domains: the debug
> domain and the CPU domain.
> +::
>
> +---------------+
> | |
> @@ -125,18 +127,21 @@ If you want to enable debugging functionality at boot time, you can add
> "coresight_cpu_debug.enable=1" to the kernel command line parameter.
>
> The driver also can work as module, so can enable the debugging when insmod
> -module:
> -# insmod coresight_cpu_debug.ko debug=1
> +module::
> +
> + # insmod coresight_cpu_debug.ko debug=1
>
> When boot time or insmod module you have not enabled the debugging, the driver
> uses the debugfs file system to provide a knob to dynamically enable or disable
> debugging:
>
> -To enable it, write a '1' into /sys/kernel/debug/coresight_cpu_debug/enable:
> -# echo 1 > /sys/kernel/debug/coresight_cpu_debug/enable
> +To enable it, write a '1' into /sys/kernel/debug/coresight_cpu_debug/enable::
> +
> + # echo 1 > /sys/kernel/debug/coresight_cpu_debug/enable
> +
> +To disable it, write a '0' into /sys/kernel/debug/coresight_cpu_debug/enable::
>
> -To disable it, write a '0' into /sys/kernel/debug/coresight_cpu_debug/enable:
> -# echo 0 > /sys/kernel/debug/coresight_cpu_debug/enable
> + # echo 0 > /sys/kernel/debug/coresight_cpu_debug/enable
>
> As explained in chapter "Clock and power domain", if you are working on one
> platform which has idle states to power off debug logic and the power
> @@ -154,34 +159,34 @@ subsystem, more specifically by using the "/dev/cpu_dma_latency"
> interface (see Documentation/power/pm_qos_interface.rst for more
> details). As specified in the PM QoS documentation the requested
> parameter will stay in effect until the file descriptor is released.
> -For example:
> +For example::
>
> -# exec 3<> /dev/cpu_dma_latency; echo 0 >&3
> -...
> -Do some work...
> -...
> -# exec 3<>-
> + # exec 3<> /dev/cpu_dma_latency; echo 0 >&3
> + ...
> + Do some work...
> + ...
> + # exec 3<>-
>
> The same can also be done from an application program.
>
> Disable specific CPU's specific idle state from cpuidle sysfs (see
> -Documentation/admin-guide/pm/cpuidle.rst):
> -# echo 1 > /sys/devices/system/cpu/cpu$cpu/cpuidle/state$state/disable
> +Documentation/admin-guide/pm/cpuidle.rst)::
>
> + # echo 1 > /sys/devices/system/cpu/cpu$cpu/cpuidle/state$state/disable
>
> Output format
> -------------
>
> -Here is an example of the debugging output format:
> -
> -ARM external debug module:
> -coresight-cpu-debug 850000.debug: CPU[0]:
> -coresight-cpu-debug 850000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock)
> -coresight-cpu-debug 850000.debug: EDPCSR: handle_IPI+0x174/0x1d8
> -coresight-cpu-debug 850000.debug: EDCIDSR: 00000000
> -coresight-cpu-debug 850000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0)
> -coresight-cpu-debug 852000.debug: CPU[1]:
> -coresight-cpu-debug 852000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock)
> -coresight-cpu-debug 852000.debug: EDPCSR: debug_notifier_call+0x23c/0x358
> -coresight-cpu-debug 852000.debug: EDCIDSR: 00000000
> -coresight-cpu-debug 852000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0)
> +Here is an example of the debugging output format::
> +
> + ARM external debug module:
> + coresight-cpu-debug 850000.debug: CPU[0]:
> + coresight-cpu-debug 850000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock)
> + coresight-cpu-debug 850000.debug: EDPCSR: handle_IPI+0x174/0x1d8
> + coresight-cpu-debug 850000.debug: EDCIDSR: 00000000
> + coresight-cpu-debug 850000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0)
> + coresight-cpu-debug 852000.debug: CPU[1]:
> + coresight-cpu-debug 852000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock)
> + coresight-cpu-debug 852000.debug: EDPCSR: debug_notifier_call+0x23c/0x358
> + coresight-cpu-debug 852000.debug: EDCIDSR: 00000000
> + coresight-cpu-debug 852000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0)
> diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight.rst
> similarity index 56%
> rename from Documentation/trace/coresight.txt
> rename to Documentation/trace/coresight.rst
> index b027d61b27a6..72f4b7ef1bad 100644
> --- a/Documentation/trace/coresight.txt
> +++ b/Documentation/trace/coresight.rst
> @@ -1,8 +1,9 @@
> - Coresight - HW Assisted Tracing on ARM
> - ======================================
> +======================================
> +Coresight - HW Assisted Tracing on ARM
> +======================================
>
> - Author: Mathieu Poirier <mathieu.poirier@...aro.org>
> - Date: September 11th, 2014
> + :Author: Mathieu Poirier <mathieu.poirier@...aro.org>
> + :Date: September 11th, 2014
>
> Introduction
> ------------
> @@ -26,7 +27,7 @@ implementation, either storing the compressed stream in a memory buffer or
> creating an interface to the outside world where data can be transferred to a
> host without fear of filling up the onboard coresight memory buffer.
>
> -At typical coresight system would look like this:
> +At typical coresight system would look like this::
>
> *****************************************************************
> **************************** AMBA AXI ****************************===||
> @@ -95,15 +96,24 @@ Acronyms and Classification
>
> Acronyms:
>
> -PTM: Program Trace Macrocell
> -ETM: Embedded Trace Macrocell
> -STM: System trace Macrocell
> -ETB: Embedded Trace Buffer
> -ITM: Instrumentation Trace Macrocell
> -TPIU: Trace Port Interface Unit
> -TMC-ETR: Trace Memory Controller, configured as Embedded Trace Router
> -TMC-ETF: Trace Memory Controller, configured as Embedded Trace FIFO
> -CTI: Cross Trigger Interface
> +PTM:
> + Program Trace Macrocell
> +ETM:
> + Embedded Trace Macrocell
> +STM:
> + System trace Macrocell
> +ETB:
> + Embedded Trace Buffer
> +ITM:
> + Instrumentation Trace Macrocell
> +TPIU:
> + Trace Port Interface Unit
> +TMC-ETR:
> + Trace Memory Controller, configured as Embedded Trace Router
> +TMC-ETF:
> + Trace Memory Controller, configured as Embedded Trace FIFO
> +CTI:
> + Cross Trigger Interface
>
> Classification:
>
> @@ -118,7 +128,7 @@ Misc:
>
>
> Device Tree Bindings
> -----------------------
> +--------------------
>
> See Documentation/devicetree/bindings/arm/coresight.txt for details.
>
> @@ -133,79 +143,79 @@ The coresight framework provides a central point to represent, configure and
> manage coresight devices on a platform. Any coresight compliant device can
> register with the framework for as long as they use the right APIs:
>
> -struct coresight_device *coresight_register(struct coresight_desc *desc);
> -void coresight_unregister(struct coresight_device *csdev);
> +.. c:function:: struct coresight_device *coresight_register(struct coresight_desc *desc);
> +.. c:function:: void coresight_unregister(struct coresight_device *csdev);
>
> -The registering function is taking a "struct coresight_device *csdev" and
> -register the device with the core framework. The unregister function takes
> -a reference to a "struct coresight_device", obtained at registration time.
> +The registering function is taking a ``struct coresight_desc *desc`` and
> +register the device with the core framework. The unregister function takes
> +a reference to a ``struct coresight_device *csdev`` obtained at registration time.
>
> If everything goes well during the registration process the new devices will
> -show up under /sys/bus/coresight/devices, as showns here for a TC2 platform:
> +show up under /sys/bus/coresight/devices, as showns here for a TC2 platform::
>
> -root:~# ls /sys/bus/coresight/devices/
> -replicator 20030000.tpiu 2201c000.ptm 2203c000.etm 2203e000.etm
> -20010000.etb 20040000.funnel 2201d000.ptm 2203d000.etm
> -root:~#
> + root:~# ls /sys/bus/coresight/devices/
> + replicator 20030000.tpiu 2201c000.ptm 2203c000.etm 2203e000.etm
> + 20010000.etb 20040000.funnel 2201d000.ptm 2203d000.etm
> + root:~#
>
> -The functions take a "struct coresight_device", which looks like this:
> +The functions take a ``struct coresight_device``, which looks like this::
>
> -struct coresight_desc {
> - enum coresight_dev_type type;
> - struct coresight_dev_subtype subtype;
> - const struct coresight_ops *ops;
> - struct coresight_platform_data *pdata;
> - struct device *dev;
> - const struct attribute_group **groups;
> -};
> + struct coresight_desc {
> + enum coresight_dev_type type;
> + struct coresight_dev_subtype subtype;
> + const struct coresight_ops *ops;
> + struct coresight_platform_data *pdata;
> + struct device *dev;
> + const struct attribute_group **groups;
> + };
>
>
> The "coresight_dev_type" identifies what the device is, i.e, source link or
> sink while the "coresight_dev_subtype" will characterise that type further.
>
> -The "struct coresight_ops" is mandatory and will tell the framework how to
> +The ``struct coresight_ops`` is mandatory and will tell the framework how to
> perform base operations related to the components, each component having
> -a different set of requirement. For that "struct coresight_ops_sink",
> -"struct coresight_ops_link" and "struct coresight_ops_source" have been
> +a different set of requirement. For that ``struct coresight_ops_sink``,
> +``struct coresight_ops_link`` and ``struct coresight_ops_source`` have been
> provided.
>
> -The next field, "struct coresight_platform_data *pdata" is acquired by calling
> -"of_get_coresight_platform_data()", as part of the driver's _probe routine and
> -"struct device *dev" gets the device reference embedded in the "amba_device":
> +The next field ``struct coresight_platform_data *pdata`` is acquired by calling
> +``of_get_coresight_platform_data()``, as part of the driver's _probe routine and
> +``struct device *dev`` gets the device reference embedded in the ``amba_device``::
>
> -static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> -{
> - ...
> - ...
> - drvdata->dev = &adev->dev;
> - ...
> -}
> + static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> + {
> + ...
> + ...
> + drvdata->dev = &adev->dev;
> + ...
> + }
>
> Specific class of device (source, link, or sink) have generic operations
> -that can be performed on them (see "struct coresight_ops"). The
> -"**groups" is a list of sysfs entries pertaining to operations
> +that can be performed on them (see ``struct coresight_ops``). The ``**groups``
> +is a list of sysfs entries pertaining to operations
> specific to that component only. "Implementation defined" customisations are
> expected to be accessed and controlled using those entries.
>
> -
> Device Naming scheme
> -------------------------
> +--------------------
> +
> The devices that appear on the "coresight" bus were named the same as their
> parent devices, i.e, the real devices that appears on AMBA bus or the platform bus.
> Thus the names were based on the Linux Open Firmware layer naming convention,
> which follows the base physical address of the device followed by the device
> -type. e.g:
> +type. e.g::
>
> -root:~# ls /sys/bus/coresight/devices/
> - 20010000.etf 20040000.funnel 20100000.stm 22040000.etm
> - 22140000.etm 230c0000.funnel 23240000.etm 20030000.tpiu
> - 20070000.etr 20120000.replicator 220c0000.funnel
> - 23040000.etm 23140000.etm 23340000.etm
> + root:~# ls /sys/bus/coresight/devices/
> + 20010000.etf 20040000.funnel 20100000.stm 22040000.etm
> + 22140000.etm 230c0000.funnel 23240000.etm 20030000.tpiu
> + 20070000.etr 20120000.replicator 220c0000.funnel
> + 23040000.etm 23140000.etm 23340000.etm
>
> However, with the introduction of ACPI support, the names of the real
> devices are a bit cryptic and non-obvious. Thus, a new naming scheme was
> introduced to use more generic names based on the type of the device. The
> -following rules apply:
> +following rules apply::
>
> 1) Devices that are bound to CPUs, are named based on the CPU logical
> number.
> @@ -220,11 +230,11 @@ following rules apply:
>
> e.g, tmc_etf0, tmc_etr0, funnel0, funnel1
>
> -Thus, with the new scheme the devices could appear as :
> +Thus, with the new scheme the devices could appear as ::
>
> -root:~# ls /sys/bus/coresight/devices/
> - etm0 etm1 etm2 etm3 etm4 etm5 funnel0
> - funnel1 funnel2 replicator0 stm0 tmc_etf0 tmc_etr0 tpiu0
> + root:~# ls /sys/bus/coresight/devices/
> + etm0 etm1 etm2 etm3 etm4 etm5 funnel0
> + funnel1 funnel2 replicator0 stm0 tmc_etf0 tmc_etr0 tpiu0
>
> Some of the examples below might refer to old naming scheme and some
> to the newer scheme, to give a confirmation that what you see on your
> @@ -234,9 +244,12 @@ the system under specified locations.
> How to use the tracer modules
> -----------------------------
>
> -There are two ways to use the Coresight framework: 1) using the perf cmd line
> -tools and 2) interacting directly with the Coresight devices using the sysFS
> -interface. Preference is given to the former as using the sysFS interface
> +There are two ways to use the Coresight framework:
> +
> +1. using the perf cmd line tools.
> +2. interacting directly with the Coresight devices using the sysFS interface.
> +
> +Preference is given to the former as using the sysFS interface
> requires a deep understanding of the Coresight HW. The following sections
> provide details on using both methods.
>
> @@ -245,107 +258,107 @@ provide details on using both methods.
> Before trace collection can start, a coresight sink needs to be identified.
> There is no limit on the amount of sinks (nor sources) that can be enabled at
> any given moment. As a generic operation, all device pertaining to the sink
> -class will have an "active" entry in sysfs:
> -
> -root:/sys/bus/coresight/devices# ls
> -replicator 20030000.tpiu 2201c000.ptm 2203c000.etm 2203e000.etm
> -20010000.etb 20040000.funnel 2201d000.ptm 2203d000.etm
> -root:/sys/bus/coresight/devices# ls 20010000.etb
> -enable_sink status trigger_cntr
> -root:/sys/bus/coresight/devices# echo 1 > 20010000.etb/enable_sink
> -root:/sys/bus/coresight/devices# cat 20010000.etb/enable_sink
> -1
> -root:/sys/bus/coresight/devices#
> +class will have an "active" entry in sysfs::
> +
> + root:/sys/bus/coresight/devices# ls
> + replicator 20030000.tpiu 2201c000.ptm 2203c000.etm 2203e000.etm
> + 20010000.etb 20040000.funnel 2201d000.ptm 2203d000.etm
> + root:/sys/bus/coresight/devices# ls 20010000.etb
> + enable_sink status trigger_cntr
> + root:/sys/bus/coresight/devices# echo 1 > 20010000.etb/enable_sink
> + root:/sys/bus/coresight/devices# cat 20010000.etb/enable_sink
> + 1
> + root:/sys/bus/coresight/devices#
>
> At boot time the current etm3x driver will configure the first address
> comparator with "_stext" and "_etext", essentially tracing any instruction
> that falls within that range. As such "enabling" a source will immediately
> -trigger a trace capture:
> -
> -root:/sys/bus/coresight/devices# echo 1 > 2201c000.ptm/enable_source
> -root:/sys/bus/coresight/devices# cat 2201c000.ptm/enable_source
> -1
> -root:/sys/bus/coresight/devices# cat 20010000.etb/status
> -Depth: 0x2000
> -Status: 0x1
> -RAM read ptr: 0x0
> -RAM wrt ptr: 0x19d3 <----- The write pointer is moving
> -Trigger cnt: 0x0
> -Control: 0x1
> -Flush status: 0x0
> -Flush ctrl: 0x2001
> -root:/sys/bus/coresight/devices#
> -
> -Trace collection is stopped the same way:
> -
> -root:/sys/bus/coresight/devices# echo 0 > 2201c000.ptm/enable_source
> -root:/sys/bus/coresight/devices#
> -
> -The content of the ETB buffer can be harvested directly from /dev:
> -
> -root:/sys/bus/coresight/devices# dd if=/dev/20010000.etb \
> -of=~/cstrace.bin
> -
> -64+0 records in
> -64+0 records out
> -32768 bytes (33 kB) copied, 0.00125258 s, 26.2 MB/s
> -root:/sys/bus/coresight/devices#
> +trigger a trace capture::
> +
> + root:/sys/bus/coresight/devices# echo 1 > 2201c000.ptm/enable_source
> + root:/sys/bus/coresight/devices# cat 2201c000.ptm/enable_source
> + 1
> + root:/sys/bus/coresight/devices# cat 20010000.etb/status
> + Depth: 0x2000
> + Status: 0x1
> + RAM read ptr: 0x0
> + RAM wrt ptr: 0x19d3 <----- The write pointer is moving
> + Trigger cnt: 0x0
> + Control: 0x1
> + Flush status: 0x0
> + Flush ctrl: 0x2001
> + root:/sys/bus/coresight/devices#
> +
> +Trace collection is stopped the same way::
> +
> + root:/sys/bus/coresight/devices# echo 0 > 2201c000.ptm/enable_source
> + root:/sys/bus/coresight/devices#
> +
> +The content of the ETB buffer can be harvested directly from /dev::
> +
> + root:/sys/bus/coresight/devices# dd if=/dev/20010000.etb \
> + of=~/cstrace.bin
> + 64+0 records in
> + 64+0 records out
> + 32768 bytes (33 kB) copied, 0.00125258 s, 26.2 MB/s
> + root:/sys/bus/coresight/devices#
>
> The file cstrace.bin can be decompressed using "ptm2human", DS-5 or Trace32.
>
> Following is a DS-5 output of an experimental loop that increments a variable up
> to a certain value. The example is simple and yet provides a glimpse of the
> wealth of possibilities that coresight provides.
> -
> -Info Tracing enabled
> -Instruction 106378866 0x8026B53C E52DE004 false PUSH {lr}
> -Instruction 0 0x8026B540 E24DD00C false SUB sp,sp,#0xc
> -Instruction 0 0x8026B544 E3A03000 false MOV r3,#0
> -Instruction 0 0x8026B548 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Timestamp Timestamp: 17106715833
> -Instruction 319 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Instruction 9 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Instruction 7 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Instruction 7 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Instruction 10 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> -Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> -Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> -Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> -Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> -Instruction 6 0x8026B560 EE1D3F30 false MRC p15,#0x0,r3,c13,c0,#1
> -Instruction 0 0x8026B564 E1A0100D false MOV r1,sp
> -Instruction 0 0x8026B568 E3C12D7F false BIC r2,r1,#0x1fc0
> -Instruction 0 0x8026B56C E3C2203F false BIC r2,r2,#0x3f
> -Instruction 0 0x8026B570 E59D1004 false LDR r1,[sp,#4]
> -Instruction 0 0x8026B574 E59F0010 false LDR r0,[pc,#16] ; [0x8026B58C] = 0x80550368
> -Instruction 0 0x8026B578 E592200C false LDR r2,[r2,#0xc]
> -Instruction 0 0x8026B57C E59221D0 false LDR r2,[r2,#0x1d0]
> -Instruction 0 0x8026B580 EB07A4CF true BL {pc}+0x1e9344 ; 0x804548c4
> -Info Tracing enabled
> -Instruction 13570831 0x8026B584 E28DD00C false ADD sp,sp,#0xc
> -Instruction 0 0x8026B588 E8BD8000 true LDM sp!,{pc}
> -Timestamp Timestamp: 17107041535
> +::
> +
> + Info Tracing enabled
> + Instruction 106378866 0x8026B53C E52DE004 false PUSH {lr}
> + Instruction 0 0x8026B540 E24DD00C false SUB sp,sp,#0xc
> + Instruction 0 0x8026B544 E3A03000 false MOV r3,#0
> + Instruction 0 0x8026B548 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Timestamp Timestamp: 17106715833
> + Instruction 319 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Instruction 9 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Instruction 7 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Instruction 7 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Instruction 10 0x8026B54C E59D3004 false LDR r3,[sp,#4]
> + Instruction 0 0x8026B550 E3530004 false CMP r3,#4
> + Instruction 0 0x8026B554 E2833001 false ADD r3,r3,#1
> + Instruction 0 0x8026B558 E58D3004 false STR r3,[sp,#4]
> + Instruction 0 0x8026B55C DAFFFFFA true BLE {pc}-0x10 ; 0x8026b54c
> + Instruction 6 0x8026B560 EE1D3F30 false MRC p15,#0x0,r3,c13,c0,#1
> + Instruction 0 0x8026B564 E1A0100D false MOV r1,sp
> + Instruction 0 0x8026B568 E3C12D7F false BIC r2,r1,#0x1fc0
> + Instruction 0 0x8026B56C E3C2203F false BIC r2,r2,#0x3f
> + Instruction 0 0x8026B570 E59D1004 false LDR r1,[sp,#4]
> + Instruction 0 0x8026B574 E59F0010 false LDR r0,[pc,#16] ; [0x8026B58C] = 0x80550368
> + Instruction 0 0x8026B578 E592200C false LDR r2,[r2,#0xc]
> + Instruction 0 0x8026B57C E59221D0 false LDR r2,[r2,#0x1d0]
> + Instruction 0 0x8026B580 EB07A4CF true BL {pc}+0x1e9344 ; 0x804548c4
> + Info Tracing enabled
> + Instruction 13570831 0x8026B584 E28DD00C false ADD sp,sp,#0xc
> + Instruction 0 0x8026B588 E8BD8000 true LDM sp!,{pc}
> + Timestamp Timestamp: 17107041535
>
> 2) Using perf framework:
>
> @@ -370,19 +383,18 @@ A Coresight PMU works the same way as any other PMU, i.e the name of the PMU is
> listed along with configuration options within forward slashes '/'. Since a
> Coresight system will typically have more than one sink, the name of the sink to
> work with needs to be specified as an event option.
> -On newer kernels the available sinks are listed in sysFS under:
> -($SYSFS)/bus/event_source/devices/cs_etm/sinks/
> +On newer kernels the available sinks are listed in sysFS under
> +($SYSFS)/bus/event_source/devices/cs_etm/sinks/::
>
> root@...alhost:/sys/bus/event_source/devices/cs_etm/sinks# ls
> tmc_etf0 tmc_etr0 tpiu0
>
> On older kernels, this may need to be found from the list of coresight devices,
> -available under ($SYSFS)/bus/coresight/devices/:
> +available under ($SYSFS)/bus/coresight/devices/::
>
> root:~# ls /sys/bus/coresight/devices/
> etm0 etm1 etm2 etm3 etm4 etm5 funnel0
> funnel1 funnel2 replicator0 stm0 tmc_etf0 tmc_etr0 tpiu0
> -
> root@...aro-nano:~# perf record -e cs_etm/@..._etr0/u --per-thread program
>
> As mentioned above in section "Device Naming scheme", the names of the devices could
> @@ -395,14 +407,14 @@ to use for the trace session.
>
> More information on the above and other example on how to use Coresight with
> the perf tools can be found in the "HOWTO.md" file of the openCSD gitHub
> -repository [3].
> +repository [#third]_.
>
> 2.1) AutoFDO analysis using the perf tools:
>
> perf can be used to record and analyze trace of programs.
>
> Execution can be recorded using 'perf record' with the cs_etm event,
> -specifying the name of the sink to record to, e.g:
> +specifying the name of the sink to record to, e.g::
>
> perf record -e cs_etm/@..._etr0/u --per-thread
>
> @@ -421,12 +433,14 @@ Generating coverage files for Feedback Directed Optimization: AutoFDO
>
> 'perf inject' accepts the --itrace option in which case tracing data is
> removed and replaced with the synthesized events. e.g.
> +::
>
> perf inject --itrace --strip -i perf.data -o perf.data.new
>
> Below is an example of using ARM ETM for autoFDO. It requires autofdo
> (https://github.com/google/autofdo) and gcc version 5. The bubble
> sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tutorial).
> +::
>
> $ gcc-5 -O3 sort.c -o sort
> $ taskset -c 2 ./sort
> @@ -455,28 +469,30 @@ difference is that clients are driving the trace capture rather
> than the program flow through the code.
>
> As with any other CoreSight component, specifics about the STM tracer can be
> -found in sysfs with more information on each entry being found in [1]:
> +found in sysfs with more information on each entry being found in [#first]_::
>
> -root@...ericarmv8:~# ls /sys/bus/coresight/devices/stm0
> -enable_source hwevent_select port_enable subsystem uevent
> -hwevent_enable mgmt port_select traceid
> -root@...ericarmv8:~#
> + root@...ericarmv8:~# ls /sys/bus/coresight/devices/stm0
> + enable_source hwevent_select port_enable subsystem uevent
> + hwevent_enable mgmt port_select traceid
> + root@...ericarmv8:~#
>
> Like any other source a sink needs to be identified and the STM enabled before
> -being used:
> +being used::
>
> -root@...ericarmv8:~# echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
> -root@...ericarmv8:~# echo 1 > /sys/bus/coresight/devices/stm0/enable_source
> + root@...ericarmv8:~# echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
> + root@...ericarmv8:~# echo 1 > /sys/bus/coresight/devices/stm0/enable_source
>
> From there user space applications can request and use channels using the devfs
> -interface provided for that purpose by the generic STM API:
> +interface provided for that purpose by the generic STM API::
> +
> + root@...ericarmv8:~# ls -l /dev/stm0
> + crw------- 1 root root 10, 61 Jan 3 18:11 /dev/stm0
> + root@...ericarmv8:~#
> +
> +Details on how to use the generic STM API can be found here [#second]_.
>
> -root@...ericarmv8:~# ls -l /dev/stm0
> -crw------- 1 root root 10, 61 Jan 3 18:11 /dev/stm0
> -root@...ericarmv8:~#
> +.. [#first] Documentation/ABI/testing/sysfs-bus-coresight-devices-stm
>
> -Details on how to use the generic STM API can be found here [2].
> +.. [#second] Documentation/trace/stm.rst
>
> -[1]. Documentation/ABI/testing/sysfs-bus-coresight-devices-stm
> -[2]. Documentation/trace/stm.rst
> -[3]. https://github.com/Linaro/perf-opencsd
> +.. [#third] https://github.com/Linaro/perf-opencsd
> diff --git a/Documentation/trace/index.rst b/Documentation/trace/index.rst
> index 6b4107cf4b98..b7891cb1ab4d 100644
> --- a/Documentation/trace/index.rst
> +++ b/Documentation/trace/index.rst
> @@ -23,3 +23,5 @@ Linux Tracing Technologies
> intel_th
> stm
> sys-t
> + coresight
> + coresight-cpu-debug
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 661def85619c..eb03e5966f11 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1582,8 +1582,8 @@ R: Suzuki K Poulose <suzuki.poulose@....com>
> L: linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
> S: Maintained
> F: drivers/hwtracing/coresight/*
> -F: Documentation/trace/coresight.txt
> -F: Documentation/trace/coresight-cpu-debug.txt
> +F: Documentation/trace/coresight.rst
> +F: Documentation/trace/coresight-cpu-debug.rst
> F: Documentation/devicetree/bindings/arm/coresight.txt
> F: Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt
> F: Documentation/ABI/testing/sysfs-bus-coresight-devices-*
> --
> 2.11.0
>
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