Subject: Re: [PATCH 8/8] coresight: etm4x: docs: Additional documentation for ETM4x.

From: Mathieu Poirier <[email-masked]>
Date: Tue, 27 Aug 2019 16:32:17 -0600

On Mon, Aug 19, 2019 at 09:57:20PM +0100, Mike Leach wrote:
> Update existing docs for new sysfs API features.
> Add new ETMv4 reference document for sysfs programming.
> Move coresight documentation to common directory.

Please split in 3 different patches.  When sending again make sure to add
Jonathan Corbet, Greg KH and the linux-doc mailing as recipients.

Thanks,
Mathieu

> 
> Signed-off-by: Mike Leach <[email-masked]>
> ---
>  .../testing/sysfs-bus-coresight-devices-etm4x | 183 ++++---
>  .../{ => coresight}/coresight-cpu-debug.txt   |   0
>  .../coresight/coresight-etm4x-reference.txt   | 459 ++++++++++++++++++
>  .../trace/{ => coresight}/coresight.txt       |   0
>  MAINTAINERS                                   |   3 +-
>  5 files changed, 575 insertions(+), 70 deletions(-)
>  rename Documentation/trace/{ => coresight}/coresight-cpu-debug.txt (100%)
>  create mode 100644 Documentation/trace/coresight/coresight-etm4x-reference.txt
>  rename Documentation/trace/{ => coresight}/coresight.txt (100%)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> index 36258bc1b473..112c50ae9986 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> @@ -1,4 +1,4 @@
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/enable_source
> +What:		/sys/bus/coresight/devices/etm<N>/enable_source
>  Date:		April 2015
>  KernelVersion:  4.01
>  Contact:        Mathieu Poirier <[email-masked]>
> @@ -8,82 +8,82 @@ Description:	(RW) Enable/disable tracing on this specific trace entiry.
>  		of coresight components linking the source to the sink is
>  		configured and managed automatically by the coresight framework.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cpu
> +What:		/sys/bus/coresight/devices/etm<N>/cpu
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) The CPU this tracing entity is associated with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_pe_cmp
> +What:		/sys/bus/coresight/devices/etm<N>/nr_pe_cmp
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of PE comparator inputs that are
>  		available for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_addr_cmp
> +What:		/sys/bus/coresight/devices/etm<N>/nr_addr_cmp
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of address comparator pairs that are
>  		available for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_cntr
> +What:		/sys/bus/coresight/devices/etm<N>/nr_cntr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of counters that are available for
>  		tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_ext_inp
> +What:		/sys/bus/coresight/devices/etm<N>/nr_ext_inp
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates how many external inputs are implemented.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/numcidc
> +What:		/sys/bus/coresight/devices/etm<N>/numcidc
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of Context ID comparators that are
>  		available for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/numvmidc
> +What:		/sys/bus/coresight/devices/etm<N>/numvmidc
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of VMID comparators that are available
>  		for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nrseqstate
> +What:		/sys/bus/coresight/devices/etm<N>/nrseqstate
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of sequencer states that are
>  		implemented.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_resource
> +What:		/sys/bus/coresight/devices/etm<N>/nr_resource
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of resource selection pairs that are
>  		available for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/nr_ss_cmp
> +What:		/sys/bus/coresight/devices/etm<N>/nr_ss_cmp
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Indicates the number of single-shot comparator controls that
>  		are available for tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/reset
> +What:		/sys/bus/coresight/devices/etm<N>/reset
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(W) Cancels all configuration on a trace unit and set it back
>  		to its boot configuration.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mode
> +What:		/sys/bus/coresight/devices/etm<N>/mode
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> @@ -91,302 +91,349 @@ Description: 	(RW) Controls various modes supported by this ETM, for example
>  		P0 instruction tracing, branch broadcast, cycle counting and
>  		context ID tracing.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/pe
> +What:		/sys/bus/coresight/devices/etm<N>/pe
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls which PE to trace.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/event
> +What:		/sys/bus/coresight/devices/etm<N>/event
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls the tracing of arbitrary events from bank 0 to 3.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/event_instren
> +What:		/sys/bus/coresight/devices/etm<N>/event_instren
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls the behavior of the events in bank 0 to 3.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/event_ts
> +What:		/sys/bus/coresight/devices/etm<N>/event_ts
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls the insertion of global timestamps in the trace
>  		streams.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/syncfreq
> +What:		/sys/bus/coresight/devices/etm<N>/syncfreq
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls how often trace synchronization requests occur.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cyc_threshold
> +What:		/sys/bus/coresight/devices/etm<N>/cyc_threshold
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Sets the threshold value for cycle counting.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/bb_ctrl
> +What:		/sys/bus/coresight/devices/etm<N>/bb_ctrl
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls which regions in the memory map are enabled to
>  		use branch broadcasting.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/event_vinst
> +What:		/sys/bus/coresight/devices/etm<N>/event_vinst
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls instruction trace filtering.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/s_exlevel_vinst
> +What:		/sys/bus/coresight/devices/etm<N>/s_exlevel_vinst
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) In Secure state, each bit controls whether instruction
>  		tracing is enabled for the corresponding exception level.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/ns_exlevel_vinst
> +What:		/sys/bus/coresight/devices/etm<N>/ns_exlevel_vinst
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) In non-secure state, each bit controls whether instruction
>  		tracing is enabled for the corresponding exception level.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/addr_idx
> +What:		/sys/bus/coresight/devices/etm<N>/addr_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Select which address comparator or pair (of comparators) to
>  		work with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/addr_instdatatype
> +What:		/sys/bus/coresight/devices/etm<N>/addr_instdatatype
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls what type of comparison the trace unit performs.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/addr_single
> +What:		/sys/bus/coresight/devices/etm<N>/addr_single
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Used to setup single address comparator values.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/addr_range
> +What:		/sys/bus/coresight/devices/etm<N>/addr_range
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Used to setup address range comparator values.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/seq_idx
> +What:		/sys/bus/coresight/devices/etm<N>/seq_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Select which sequensor.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/seq_state
> +What:		/sys/bus/coresight/devices/etm<N>/seq_state
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Use this to set, or read, the sequencer state.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/seq_event
> +What:		/sys/bus/coresight/devices/etm<N>/seq_event
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Moves the sequencer state to a specific state.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/seq_reset_event
> +What:		/sys/bus/coresight/devices/etm<N>/seq_reset_event
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Moves the sequencer to state 0 when a programmed event
>  		occurs.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cntr_idx
> +What:		/sys/bus/coresight/devices/etm<N>/cntr_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Select which counter unit to work with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cntrldvr
> +What:		/sys/bus/coresight/devices/etm<N>/cntrldvr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) This sets or returns the reload count value of the
>  		specific counter.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cntr_val
> +What:		/sys/bus/coresight/devices/etm<N>/cntr_val
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) This sets or returns the current count value of the
>                  specific counter.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/cntr_ctrl
> +What:		/sys/bus/coresight/devices/etm<N>/cntr_ctrl
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls the operation of the selected counter.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/res_idx
> +What:		/sys/bus/coresight/devices/etm<N>/res_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Select which resource selection unit to work with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/res_ctrl
> +What:		/sys/bus/coresight/devices/etm<N>/res_ctrl
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description: 	(RW) Controls the selection of the resources in the trace unit.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/ctxid_idx
> +What:		/sys/bus/coresight/devices/etm<N>/ctxid_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Select which context ID comparator to work with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/ctxid_pid
> +What:		/sys/bus/coresight/devices/etm<N>/ctxid_pid
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Get/Set the context ID comparator value to trigger on.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/ctxid_masks
> +What:		/sys/bus/coresight/devices/etm<N>/ctxid_masks
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Mask for all 8 context ID comparator value
>  		registers (if implemented).
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/vmid_idx
> +What:		/sys/bus/coresight/devices/etm<N>/vmid_idx
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Select which virtual machine ID comparator to work with.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/vmid_val
> +What:		/sys/bus/coresight/devices/etm<N>/vmid_val
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Get/Set the virtual machine ID comparator value to
>  		trigger on.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/vmid_masks
> +What:		/sys/bus/coresight/devices/etm<N>/vmid_masks
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(RW) Mask for all 8 virtual machine ID comparator value
>  		registers (if implemented).
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcoslsr
> +What:		/sys/bus/coresight/devices/etm<N>/addr_exlevel_s_ns
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(RW) Set the Exception Level matching bits for secure and
> +		non-secure exception levels.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/vinst_pe_cmp_start_stop
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(RW) Access the start stop control register for PE input
> +		comparators.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/addr_cmp_view
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(R) Print the current settings for the selected address
> +		comparator.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/sshot_idx
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(RW) Select the single shot control register to access.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/sshot_ctrl
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(RW) Access the selected single shot control register.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/sshot_status
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(R) Print the current value of the selected single shot
> +		status register.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/sshot_pe_ctrl
> +Date:		August 2019
> +KernelVersion:	5.4
> +Contact:	Mathieu Poirier <[email-masked]>
> +Description:	(RW) Access the selected single show PE comparator control
> +		register.
> +
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcoslsr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the OS Lock Status Register (0x304).
>  		The value it taken directly  from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdcr
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpdcr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Power Down Control Register
>  		(0x310).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdsr
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpdsr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Power Down Status Register
>  		(0x314).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trclsr
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trclsr
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the SW Lock Status Register
>  		(0xFB4).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcauthstatus
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcauthstatus
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Authentication Status Register
>  		(0xFB8).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevid
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcdevid
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Device ID Register
>  		(0xFC8).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevtype
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcdevtype
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Device Type Register
>  		(0xFCC).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr0
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr0
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Peripheral ID0 Register
>  		(0xFE0).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr1
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr1
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Peripheral ID1 Register
>  		(0xFE4).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr2
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr2
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Peripheral ID2 Register
>  		(0xFE8).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr3
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr3
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the Peripheral ID3 Register
>  		(0xFEC).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcconfig
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trcconfig
>  Date:		February 2016
>  KernelVersion:	4.07
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the trace configuration register
>  		(0x010) as currently set by SW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/mgmt/trctraceid
> +What:		/sys/bus/coresight/devices/etm<N>/mgmt/trctraceid
>  Date:		February 2016
>  KernelVersion:	4.07
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Print the content of the trace ID register (0x040).
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr0
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr0
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns the tracing capabilities of the trace unit (0x1E0).
>  		The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr1
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr1
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns the tracing capabilities of the trace unit (0x1E4).
>  		The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr2
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr2
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> @@ -394,7 +441,7 @@ Description:	(R) Returns the maximum size of the data value, data address,
>  		VMID, context ID and instuction address in the trace unit
>  		(0x1E8).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr3
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr3
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> @@ -403,42 +450,42 @@ Description:	(R) Returns the value associated with various resources
>  		architecture specification for more details (0x1E8).
>  		The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr4
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr4
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns how many resources the trace unit supports (0x1F0).
>  		The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr5
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr5
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns how many resources the trace unit supports (0x1F4).
>  		The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr8
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr8
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns the maximum speculation depth of the instruction
>  		trace stream. (0x180).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr9
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr9
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns the number of P0 right-hand keys that the trace unit
>  		can use (0x184).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr10
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr10
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
>  Description:	(R) Returns the number of P1 right-hand keys that the trace unit
>  		can use (0x188).  The value is taken directly from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr11
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr11
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> @@ -446,7 +493,7 @@ Description:	(R) Returns the number of special P1 right-hand keys that the
>  		trace unit can use (0x18C).  The value is taken directly from
>  		the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr12
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr12
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> @@ -454,7 +501,7 @@ Description:	(R) Returns the number of conditional P1 right-hand keys that
>  		the trace unit can use (0x190).  The value is taken directly
>  		from the HW.
>  
> -What:		/sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr13
> +What:		/sys/bus/coresight/devices/etm<N>/trcidr/trcidr13
>  Date:		April 2015
>  KernelVersion:	4.01
>  Contact:	Mathieu Poirier <[email-masked]>
> diff --git a/Documentation/trace/coresight-cpu-debug.txt b/Documentation/trace/coresight/coresight-cpu-debug.txt
> similarity index 100%
> rename from Documentation/trace/coresight-cpu-debug.txt
> rename to Documentation/trace/coresight/coresight-cpu-debug.txt
> diff --git a/Documentation/trace/coresight/coresight-etm4x-reference.txt b/Documentation/trace/coresight/coresight-etm4x-reference.txt
> new file mode 100644
> index 000000000000..72e81bbbef43
> --- /dev/null
> +++ b/Documentation/trace/coresight/coresight-etm4x-reference.txt
> @@ -0,0 +1,459 @@
> +ETMv4 sysfs linux driver programming reference - v2.
> +====================================================
> +
> +Supplement to existing ETMv4 driver documentation.
> +
> +Sysfs files and directories
> +---------------------------
> +
> +Root: /sys/bus/coresight/devices/etm<N>
> +
> +
> +The following paragraphs explain the association between sysfs files and the
> +ETMv4 registers that they effect. Note the register names are given without
> +the ‘TRC’ prefix.
> +
> +File		: mode (rw)
> +Trace Registers	: {CONFIGR + others}
> +Notes 		: Bit select trace features. See ‘mode’ section below. Bits
> +		in this will cause equivalent programming of trace config and
> +		other registers to enable the features requested.
> +Syntax & eg	: 'echo bitfield > mode'
> +       	 	bitfield up to 32 bits setting trace features.
> +Example		: $> echo 0x > mode
> +
> +File		: reset (wo)
> +Trace Registers	: All
> +Notes 		: Reset all programming to trace nothing / no logic programmed.
> +Syntax		: 'echo 1 > reset'
> +
> +File		: enable_source (wo)
> +Trace Registers	: PRGCTLR, All hardware regs.
> +Notes 		:  >0: Programs up the hardware with the current values held in
> +		the driver and enables trace.
> +		0: disable trace hardware.
> +Syntax		: 'echo 1 > enable_source'
> +
> +File		: cpu (ro)
> +Trace Registers	: None.
> +Notes 		: CPU ID that this ETM is attached to.
> +Example		:$> cat cpu
> +		$> 0
> +
> +File		: addr_idx (rw)
> +Trace Registers	: None.
> +Notes 		: Virtual register to index address comparator and range
> +		features. Set index for first of the pair in a range.
> +Syntax		: 'echo idx > addr_idx'
> +		Where idx <  nr_addr_cmp x 2
> +
> +File		: addr_range (rw)
> +Trace Registers	: ACVR[idx, idx+1], VIIECTLR
> +Notes 		: Pair of addresses for a range selected by addr_idx. Include
> +		/ exclude according to the optional parameter, or if omitted
> +		uses the current ‘mode’ setting. Select comparator range in
> +		control register. Error if index is odd value.
> +Depends		: mode, addr_idx
> +Syntax		: 'echo addr1 addr2 [exclude] > addr_range'
> +		Where addr1 and addr2 define the range and addr1 < addr2.
> +		Optional exclude value - 0 for include, 1 for exclude.
> +Example		: $> echo 0x0000 0x2000 0 > addr_range
> +
> +File		: addr_single (rw)
> +Trace Registers	: ACVR[idx]
> +Notes 		: Set a single address comparator according to addr_idx. This
> +		is used if the address comparator is used as part of event
> +		generation logic etc.
> +Depends		: addr_idx
> +Syntax		: 'echo addr1 > addr_single'
> +
> +File		: addr_start (rw)
> +Trace Registers	: ACVR[idx], VISSCTLR
> +Notes 		: Set a trace start address comparator according to addr_idx.
> +		Select comparator in control register.
> +Depends		: addr_idx
> +Syntax		: 'echo addr1 > addr_start'
> +
> +File		: addr_stop (rw)
> +Trace Registers	: ACVR[idx], VISSCTLR
> +Notes 		: Set a trace stop address comparator according to addr_idx.
> +		Select comparator in control register.
> +Depends		: addr_idx
> +Syntax		: 'echo addr1 > addr_stop'
> +
> +File		: addr_context (rw)
> +Trace Registers	: ACATR[idx,{6:4}]
> +Notes 		: Link context ID comparator to address comparator addr_idx
> +Depends		: addr_idx.
> +Syntax		: 'echo ctxt_idx > addr_context'
> +		Where ctxt_idx is the index of the linked context id / vmid
> +		comparator.
> +
> +File		: addr_ctxtype (rw)
> +Trace Registers	: ACATR[idx,{3:2}]
> +Notes 		: Input value string. Set type for linked context ID comparator
> +Depends		: addr_idx
> +Syntax		: 'echo type > addr_ctxtype'
> +		Type one of {all, vmid, ctxid, none}
> +Example		: $> echo ctxid > addr_ctxtype
> +
> +File		: addr_exlevel_s_ns (rw)
> +Trace Registers	: ACATR[idx,{14:8}]
> +Notes 		: Set the ELx secure and non-secure  matching bits for the
> +		selected address comparator
> +Depends		: addr_idx
> +Syntax		: 'echo val > addr_exlevel_s_ns'
> +		val is a 7 bit value for exception levels to exclude. Input
> +		value shifted to correct bits in register.
> +Example		: $> echo 0x4F > addr_exlevel_s_ns
> +
> +File		: addr_instdatatype (rw)
> +Trace Registers	: ACATR[idx,{1:0}]
> +Notes 		: Set the comparator address type for matching. Driver only
> +		supports setting instruction address type.
> +Depends		: addr_idx
> +
> +File		: addr_cmp_view (ro)
> +Trace Registers	: ACVR[idx, idx+1], ACATR[idx], VIIECTLR
> +Notes 		: Read the currently selected address comparator. If part of
> +		address range then display both addresses.
> +Depends		: addr_idx
> +Syntax		: 'cat addr_cmp_view'
> +Example		: $> cat addr_cmp_view
> +		addr_cmp[0] range 0x0 0xffffffffffffffff include ctrl(0x4b00)
> +
> +File		: nr_addr_cmp (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of address comparator pairs
> +
> +File		: sshot_idx (rw)
> +Trace Registers	: None
> +Notes 		: Select  single shot register set.
> +
> +File		: sshot_ctrl (rw)
> +Trace Registers	: SSCCR[idx]
> +Notes 		: Access a single shot comparator control register.
> +Depends		: sshot_idx
> +Syntax		: 'echo val > sshot_ctrl'
> +		Writes val into the selected control register.
> +
> +File		: sshot_status (ro)
> +Trace Registers	: SSCSR[idx]
> +Notes 		: Read a single shot comparator status register
> +Depends		: sshot_idx
> +Syntax		: 'cat sshot_status'
> +		Read status.
> +Example		: $> cat sshot_status
> +		0x1
> +
> +File		: sshot_pe_ctrl (rw)
> +Trace Registers	: SSPCICR[idx]
> +Notes 		: Access a single shot PE comparator input control register.
> +Depends		: sshot_idx
> +Syntax		: echo val > sshot_pe_ctrl
> +		Writes val into the selected control register.
> +
> +File		: ns_exlevel_vinst (rw)
> +Trace Registers	: VICTLR{23:20}
> +Notes 		: Program non-secure exception level filters. Set / clear NS
> +		exception filter bits. Setting ‘1’ excludes trace from the
> +		exception level.
> +Syntax		: 'echo bitfield > ns_exlevel_viinst'
> +		Where bitfield contains bits to set clear for EL0 to EL2
> +Example		: %> echo 0x4 > ns_exlevel_viinst
> +		; Exclude EL2 NS trace.
> +
> +File		: vinst_pe_cmp_start_stop (rw)
> +Trace Registers	: VIPCSSCTLR
> +Notes 		: Access PE start stop comparator input control registers
> +
> +File		: bb_ctrl (rw)
> +Trace Registers	: BBCTLR
> +Notes 		: Define ranges that Branch Broadcast will operate in.
> +		Default (0x0) is all addresses.
> +Depends		: BB enabled.
> +
> +File		: cyc_threshold (rw)
> +Trace Registers	: CCCTLR
> +Notes 		: Set the threshold for which cycle counts will be emitted.
> +		Error if attempt to set below minimum defined in IDR3, masked
> +		to width of valid bits.
> +Depends		: CC enabled.
> +
> +File		: syncfreq (rw)
> +Trace Registers	: SYNCPR
> +Notes 		: Set trace synchronisation period. Power of 2 value, 0 (off)
> +		or 8-20. Driver defaults to 12 (every 4096 bytes).
> +
> +File		: cntr_idx (rw)
> +Trace Registers	: none
> +Notes 		: Select the counter to access
> +Syntax		: 'echo idx > cntr_idx'
> +		Where idx <  nr_cntr
> +
> +File		: cntr_ctrl (rw)
> +Trace Registers	: CNTCTLR[idx]
> +Notes 		: Set counter control value
> +Depends		: cntr_idx
> +Syntax		: 'echo val > cntr_ctrl'
> +		Where val is per ETMv4 spec.
> +
> +File		: cntrldvr (rw)
> +Trace Registers	: CNTRLDVR[idx]
> +Notes 		: Set counter reload value
> +Depends		: cntr_idx
> +Syntax		: 'echo val > cntrldvr'
> +		Where val is per ETMv4 spec.
> +
> +File		: nr_cntr (ro)
> +Trace Registers	: From IDR5
> +Notes 		: Number of counters implemented.
> +
> +File		: ctxid_idx (rw)
> +Trace Registers	: None
> +Notes 		: Select the context ID comparator to access
> +Syntax		: 'echo idx > ctxid_idx'
> +		Where idx <  numcidc
> +
> +File		: ctxid_pid (rw)
> +Trace Registers	: CIDCVR[idx]
> +Notes 		: Set the context ID comparator value
> +Depends		: ctxid_idx
> +
> +File		: ctxid_masks (rw)
> +Trace Registers	: CIDCCTLR0, CIDCCTLR1, CIDCVR<0-7>
> +Notes 		: Pair of values to set the byte masks for 1-8 context ID
> +		comparators. Automatically clears masked bytes to 0 in CID
> +		value registers.
> +Syntax		: 'echo m3m2m1m0 [m7m6m5m4] > ctxid_masks'
> +		32 bit values made up of mask bytes, where mN represents a
> +		byte mask value for Ctxt ID comparator N.
> +		Second value not required on systems that have fewer than 4
> +		context ID comparators
> +
> +File		: numcidc (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of Context ID comparators
> +
> +File		: vmid_idx (rw)
> +Trace Registers	: None
> +Notes 		: Select the VM ID comparator to access.
> +Syntax		: 'echo idx > vmid_idx'
> +		Where idx <  numvmidc
> +
> +File		: vmid_val (rw)
> +Trace Registers	: VMIDCVR[idx]
> +Notes 		: Set the VM ID comparator value
> +Depends		: vmid_idx
> +
> +File		: vmid_masks (rw)
> +Trace Registers	: VMIDCCTLR0, VMIDCCTLR1, VMIDCVR<0-7>
> +Notes 		: Pair of values to set the byte masks for 1-8 VM ID
> +		comparators. Automatically clears masked bytes to 0 in VMID
> +		value registers.
> +Syntax		: 'echo m3m2m1m0 [m7m6m5m4] > vmid_masks'
> +		Where mN represents a byte mask value for VMID comparator N.
> +		Second value not required on systems that have fewer than
> +		4 VMID comparators.
> +
> +File		: numvmidc (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of VMID comparators
> +
> +File		: res_idx (rw)
> +Trace Registers	: None.
> +Notes 		: Select the resource selector control to access. Must be 2 or
> +		higher as selectors 0 and 1 are hardwired.
> +Syntax		: 'echo idx > res_idx'
> +		Where 2 <= idx <  nr_resource x 2
> +
> +File		: res_ctrl (rw)
> +Trace Registers	: RSCTLR[idx]
> +Notes 		: Set resource selector control value. Value per ETMv4 spec.
> +Depends		: res_idx
> +Syntax		: 'echo val > res_cntr'
> +		Where val is per ETMv4 spec.
> +
> +File		: nr_resource (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of resource selector pairs
> +
> +File		: event (rw)
> +Trace Registers	: EVENTCTRL0R
> +Notes 		: Set up to 4 implemented event fields.
> +Syntax		: 'echo ev3ev2ev1ev0 > event'
> +		Where evN is an 8 bit event field. Up to 4 event fields make up
> +		the 32bit input value. Number of valid fields implementation
> +		dependent defined in IDR0.
> +
> +File		: event_instren (rw)
> +Trace Registers	: EVENTCTRL1R
> +Notes 		: Choose events which insert event packets into trace stream.
> +Depends		: EVENTCTRL0R
> +Syntax		: 'echo bitfield > event_instren'
> +		Where bitfield is up to 4 bits according to number of event
> +		fields.
> +
> +File		: event_ts (rw)
> +Trace Registers	: TSCTLR
> +Notes 		: Set the event that will generate timestamp requests.
> +Depends		: TS activated
> +Syntax		: 'echo evfield > event_ts'
> +		Where evfield is an 8 bit event selector.
> +
> +File		: seq_idx (rw)
> +Trace Registers	: None
> +Notes 		: Sequencer event register select - 0 to 2
> +
> +
> +File		: seq_state (rw)
> +Trace Registers	: SEQSTR
> +Notes 		: Sequencer current state - 0 to 3.
> +
> +File		: seq_event (rw)
> +Trace Registers	: SEQEVR[idx]
> +Notes 		: State transition event registers
> +Depends		: seq_idx
> +Syntax		: 'echo evBevF > seq_event'
> +		Where evBevF is a 16 bit value made up of two event selectors,
> +		evB - back, evF - forwards.
> +
> +File		: seq_reset_event (rw)
> +Trace Registers	: SEQRSTEVR
> +Notes 		: Sequencer reset event
> +Syntax		: 'echo evfield > seq_reset_event'
> +		Where evfield is an 8 bit event selector.
> +
> +File		: nrseqstate (ro)
> +Trace Registers	: From IDR5
> +Notes 		: Number of sequencer states (0 or 4)
> +
> +File		: nr_pe_cmp (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of PE comparator inputs
> +
> +File		: nr_ext_inp (ro)
> +Trace Registers	: From IDR5
> +Notes 		: Number of external inputs
> +
> +File		: nr_ss_cmp (ro)
> +Trace Registers	: From IDR4
> +Notes 		: Number of Single Shot control registers
> +
> +Note: When programming any address comparator the driver will tag the
> +comparator with a type used - i.e. RANGE, SINGLE, START, STOP. Once this tag
> +is set, then only the values can be changed using the same sysfs file / type
> +used to program it.
> +
> +Thus:-
> +% echo 0 > addr_idx		    ; select address comparator 0
> +% echo 0x1000 0x5000 0 > addr_range ; set address range on comparators 0 and 1.
> +% echo 0x2000 > addr_start	    ; this will error as comparator 0 is a
> +       	      			    ; range comparator
> +% echo 2 > addr_idx 		    ; select address comparator 2
> +% echo 0x2000 > addr_start	    ; this is OK as comparator 2 is unused,
> +% echo 0x3000 > addr_stop	    ; this will error as comparator 2 a start
> +       	      			    ; address comparator
> +% echo 2 > addr_idx 		    ; select address comparator 3
> +% echo 0x3000 > addr_stop	    ; this is OK
> +
> +To remove programming on all the comparators (and all the other hardware) use
> +the reset parameter:
> +
> +% echo 1 > reset
> +
> +The ‘mode’ sysfs parameter.
> +---------------------------
> +
> +This is a bitfield selection parameter that sets the overall trace mode for the
> +ETM. The table below describes the bits, using the defines from the driver
> +source file, along with a description of the feature these represent. Many
> +features are optional and therefore dependent on implementation in the
> +hardware.
> +
> +Bit assignements shown below:-
> +
> +bit (0)	    : #define ETM_MODE_EXCLUDE
> +description : This is the default value for the include / exclude function when
> +	      setting address ranges. Set 1 for exclude range. When the mode
> +	      parameter is set this value is applied to the currently indexed
> +	      address range.
> +
> +bit (4)	    : #define ETM_MODE_BB
> +description : Set to enable branch broadcast if supported in hardware [IDR0].
> +
> +bit (5)	    : #define ETMv4_MODE_CYCACC
> +description : Set to enable cycle accurate trace if supported [IDR0].
> +
> +bit (6)	    : ETMv4_MODE_CTXID
> +description : Set to enable context ID tracing if supported in hardware [IDR2].
> +
> +bit (7)	    : ETM_MODE_VMID
> +description : Set to enable virtual machine ID tracing if supported [IDR2].
> +
> +bit (11)    : ETMv4_MODE_TIMESTAMP
> +description : Set to enable timestamp generation if supported [IDR0].
> +
> +bit (12)    : ETM_MODE_RETURNSTACK
> +description : Set to enable trace return stack use if supported [IDR0].
> +
> +bit (13-14) : ETM_MODE_QELEM(val)
> +description : ‘val’ determines level of Q element support enabled if
> +	    implemented by the ETM [IDR0]
> +
> +bit (19)    : ETM_MODE_ATB_TRIGGER
> +description : Set to enable the ATBTRIGGER bit in the event control register
> +	    [EVENTCTLR1] if supported [IDR5].
> +
> +bit (20)    : ETM_MODE_LPOVERRIDE
> +description : Set to enable the LPOVERRIDE bit in the event control register
> +	    [EVENTCTLR1], if supported [IDR5].
> +
> +bit (21)    : ETM_MODE_ISTALL_EN
> +description : Set to enable the ISTALL bit in the stall control register
> +	    [STALLCTLR]
> +
> +bit (23)    : ETM_MODE_INSTPRIO
> +description : Set to enable the INSTPRIORITY bit in the stall control register
> +	    [STALLCTLR] , if supported [IDR0].
> +
> +bit (24)    : ETM_MODE_NOOVERFLOW
> +description : Set to enable the NOOVERFLOW bit in the stall control register
> +	    [STALLCTLR], if supported [IDR3].
> +
> +bit (25)    : ETM_MODE_TRACE_RESET
> +description : Set to enable the TRCRESET bit in the viewinst control register
> +	    [VICTLR] , if supported [IDR3].
> +
> +bit (26)    : ETM_MODE_TRACE_ERR
> +description : Set to enable the TRCCTRL bit in the viewinst control register
> +	    [VICTLR].
> +
> +bit (27)    : ETM_MODE_VIEWINST_STARTSTOP
> +description : Set the initial state value of the ViewInst start / stop logic
> +	    in the viewinst control register [VICTLR]
> +
> +bit (30)    : ETM_MODE_EXCL_KERN
> +description : Set default trace setup to exclude kernel mode trace (see note a)
> +
> +bit (31)    : ETM_MODE_EXCL_USER
> +description : Set default trace setup to exclude user space trace (see note a)
> +
> +Note a) On startup the ETM is programmed to trace the complete address space
> +using address range comparator 0. ‘mode’ bits 30 / 31 modify this setting to
> +set EL exclude bits for NS state in either user space (EL0) or kernel space
> +(EL1) in the address range comparator. (the default setting excludes all
> +secure EL, and NS EL2)
> +
> +Once the reset parameter has been used, and/or custom programming has been
> +implemented - using these bits will result in the EL bits for address
> +comparator 0 being set in the same way.
> +
> +Note b) Bits 2-3, 8-10, 15-16, 18, 22, control features that only work with
> +data trace. As A profile data trace is architecturally prohibited in ETMv4,
> +these have been omitted here. Possible uses could be where a kernel has
> +support for control of R or M profile infrastructure as part of a heterogeneous
> +system.
> +
> +Bits 17, 28-29 are unused.
> +
> diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight/coresight.txt
> similarity index 100%
> rename from Documentation/trace/coresight.txt
> rename to Documentation/trace/coresight/coresight.txt
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 783569e3c4b4..777b77fde29b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1582,8 +1582,7 @@ R:	Suzuki K Poulose <[email-masked]>
>  L:	[email-masked] (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/*
>  F:	Documentation/devicetree/bindings/arm/coresight.txt
>  F:	Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt
>  F:	Documentation/ABI/testing/sysfs-bus-coresight-devices-*
> -- 
> 2.17.1
> 

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