coresight: Adding ABI documentation
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier
Greg Kroah-Hartman
parent
4b7e4f8289
commit
7a25ec8e48
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What: /sys/bus/coresight/devices/<memory_map>.etb/enable_sink
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Add/remove a sink from a trace path. There can be multiple
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source for a single sink.
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ex: echo 1 > /sys/bus/coresight/devices/20010000.etb/enable_sink
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What: /sys/bus/coresight/devices/<memory_map>.etb/status
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) List various control and status registers. The specific
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layout and content is driver specific.
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What: /sys/bus/coresight/devices/<memory_map>.etb/trigger_cntr
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Disables write access to the Trace RAM by stopping the
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formatter after a defined number of words have been stored
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following the trigger event. The number of 32-bit words written
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into the Trace RAM following the trigger event is equal to the
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value stored in this register+1 (from ARM ETB-TRM).
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/enable_source
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Enable/disable tracing on this specific trace entiry.
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Enabling a source implies the source has been configured
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properly and a sink has been identidifed for it. The path
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of coresight components linking the source to the sink is
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configured and managed automatically by the coresight framework.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/status
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) List various control and status registers. The specific
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layout and content is driver specific.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_idx
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: Select which address comparator or pair (of comparators) to
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work with.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_acctype
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with @addr_idx. Specifies
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characteristics about the address comparator being configure,
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for example the access type, the kind of instruction to trace,
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processor contect ID to trigger on, etc. Individual fields in
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the access type register may vary on the version of the trace
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entity.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_range
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with @addr_idx. Specifies the range of
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addresses to trigger on. Inclusion or exclusion is specificed
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in the corresponding access type register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_single
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with @addr_idx. Specifies the single
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address to trigger on, highly influenced by the configuration
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options of the corresponding access type register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_start
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with @addr_idx. Specifies the single
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address to start tracing on, highly influenced by the
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configuration options of the corresponding access type register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_stop
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with @addr_idx. Specifies the single
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address to stop tracing on, highly influenced by the
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configuration options of the corresponding access type register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_idx
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Specifies the counter to work on.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with cntr_idx, give access to the
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counter event register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_val
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with cntr_idx, give access to the
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counter value register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_rld_val
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with cntr_idx, give access to the
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counter reload value register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_rld_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used in conjunction with cntr_idx, give access to the
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counter reload event register.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_idx
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Specifies the index of the context ID register to be
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selected.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_mask
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Mask to apply to all the context ID comparator.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_val
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Used with the ctxid_idx, specify with context ID to trigger
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on.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/enable_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines which event triggers a trace.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/etmsr
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Gives access to the ETM status register, which holds
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programming information and status on certains events.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/fifofull_level
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Number of byte left in the fifo before considering it full.
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Depending on the tracer's version, can also hold threshold for
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data suppression.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mode
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Interface with the driver's 'mode' field, controlling
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various aspect of the trace entity such as time stamping,
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context ID size and cycle accurate tracing. Driver specific
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and bound to change depending on the driver.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_addr_cmp
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) Provides the number of address comparators pairs accessible
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on a trace unit, as specified by bit 3:0 of register ETMCCR.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_cntr
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) Provides the number of counters accessible on a trace unit,
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as specified by bit 15:13 of register ETMCCR.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_ctxid_cmp
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) Provides the number of context ID comparator available on a
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trace unit, as specified by bit 25:24 of register ETMCCR.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/reset
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (W) Cancels all configuration on a trace unit and set it back
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to its boot configuration.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_12_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 1 to state 2.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_13_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 1 to state 3.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_21_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 2 to state 1.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_23_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 2 to state 3.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_31_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 3 to state 1.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_32_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines the event that causes the sequencer to transition
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from state 3 to state 2.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/curr_seq_state
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (R) Holds the current state of the sequencer.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/sync_freq
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Holds the trace synchronization frequency value - must be
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programmed with the various implementation behavior in mind.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/timestamp_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines an event that requests the insertion of a timestamp
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into the trace stream.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/traceid
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Holds the trace ID that will appear in the trace stream
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coming from this trace entity.
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What: /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/trigger_event
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Define the event that controls the trigger.
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@ -0,0 +1,12 @@
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What: /sys/bus/coresight/devices/<memory_map>.funnel/funnel_ctrl
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Enables the slave ports and defines the hold time of the
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slave ports.
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What: /sys/bus/coresight/devices/<memory_map>.funnel/priority
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Defines input port priority order.
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@ -0,0 +1,8 @@
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What: /sys/bus/coresight/devices/<memory_map>.tmc/trigger_cntr
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Date: November 2014
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KernelVersion: 3.19
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Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
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Description: (RW) Disables write access to the Trace RAM by stopping the
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formatter after a defined number of words have been stored
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following the trigger event. Additional interface for this
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driver are expected to be added as it matures.
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@ -925,6 +925,7 @@ S: Maintained
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F: drivers/coresight/*
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F: Documentation/trace/coresight.txt
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F: Documentation/devicetree/bindings/arm/coresight.txt
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F: Documentation/ABI/testing/sysfs-bus-coresight-devices-*
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ARM/CORGI MACHINE SUPPORT
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M: Richard Purdie <rpurdie@rpsys.net>
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