linux-stable.git/tools/perf/util/cs-etm-decoder, branch linux-4.19.y

perf cs-etm: Change tuple from traceID-CPU# to traceID-metadata

2020-12-30T10:25:49+00:00

commit 95c6fe970a0160cb770c5dce9f80311b42d030c0 upstream.

If packet processing wants to know the packet is bound with which ETM
version, it needs to access metadata to decide that based on metadata
magic number; but we cannot simply to use CPU logic ID number as index
to access metadata sequential array, especially when system have
hotplugged off CPUs, the metadata array are only allocated for online
CPUs but not offline CPUs, so the CPU logic number doesn't match with
its index in the array.

This patch is to change tuple from traceID-CPU# to traceID-metadata,
thus it can use the tuple to retrieve metadata pointer according to
traceID.

For safe accessing metadata fields, this patch provides helper function
cs_etm__get_cpu() which is used to return CPU number according to
traceID; cs_etm_decoder__buffer_packet() is the first consumer for this
helper function.

Signed-off-by: Leo Yan 
Reviewed-by: Mathieu Poirier 
Cc: Alexander Shishkin 
Cc: Jiri Olsa 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Robert Walker 
Cc: Suzuki K Poulouse 
Cc: coresight ml 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190129122842.32041-6-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo 
[Salvatore Bonaccorso: Adjust for context changes in
tools/perf/util/cs-etm-decoder/cs-etm-decoder.c]
Signed-off-by: Salvatore Bonaccorso 
Signed-off-by: Greg Kroah-Hartman

perf cs-etm: Fix start tracing packet handling

2018-07-31T13:57:56+00:00

Usually the start tracing packet is a CS_ETM_TRACE_ON packet, this
packet is passed to cs_etm__flush();  cs_etm__flush() will check the
condition 'prev_packet->sample_type == CS_ETM_RANGE' but 'prev_packet'
is allocated by zalloc() so 'prev_packet->sample_type' is zero in
initialization and this condition is false.  So cs_etm__flush() will
directly bail out without handling the start tracing packet.

This patch is to introduce a new sample type CS_ETM_EMPTY, which is used
to indicate the packet is an empty packet.  cs_etm__flush() will swap
packets when it finds the previous packet is empty, so this can record
the start tracing packet into 'etmq->prev_packet'.

Signed-off-by: Leo Yan 
Reviewed-by: Mathieu Poirier 
Cc: Alexander Shishkin 
Cc: Jiri Olsa 
Cc: Kim Phillips 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Robert Walker 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1531295145-596-4-git-send-email-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Introduce invalid address macro

2018-07-24T17:48:22+00:00

This patch introduces invalid address macro and uses it to replace dummy
value '0xdeadbeefdeadbeefUL'.

Signed-off-by: Leo Yan 
Reviewed-by: Mathieu Poirier 
Cc: Alexander Shishkin 
Cc: Jiri Olsa 
Cc: Kim Phillips 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Robert Walker 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1529298599-3876-2-git-send-email-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Fix indexing for decoder packet queue

2018-05-30T18:38:40+00:00

The tail of a queue is supposed to be pointing to the next available
slot in a queue.  In this implementation the tail is incremented before
it is used and as such points to the last used element, something that
has the immense advantage of centralizing tail management at a single
location and eliminating a lot of redundant code.

But this needs to be taken into consideration on the dequeueing side
where the head also needs to be incremented before it is used, or the
first available element of the queue will be skipped.

Signed-off-by: Mathieu Poirier 
Tested-by: Leo Yan 
Cc: Alexander Shishkin 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Robert Walker 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1527289854-10755-1-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

coresight: Move to SPDX identifier

2018-04-19T15:29:41+00:00

Move CoreSight headers to the SPDX identifier.

Signed-off-by: Mathieu Poirier 
Cc: Alexander Shishkin 
Cc: Greg Kroah-Hartman 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1524089118-27595-1-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf inject: Emit instruction records on ETM trace discontinuity

2018-02-16T17:55:45+00:00

There may be discontinuities in the ETM trace stream due to overflows or
ETM configuration for selective trace.  This patch emits an instruction
sample with the pending branch stack when a TRACE ON packet occurs
indicating a discontinuity in the trace data.

A new packet type CS_ETM_TRACE_ON is added, which is emitted by the low
level decoder when a TRACE ON occurs.  The higher level decoder flushes
the branch stack when this packet is emitted.

Signed-off-by: Robert Walker 
Acked-by: Mathieu Poirier 
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1518607481-4059-3-git-send-email-robert.walker@arm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Inject capabilitity for CoreSight traces

2018-02-16T17:55:44+00:00

Added user space perf functionality to translate CoreSight traces into
instruction events with branch stack.

To invoke the new functionality, use the perf inject tool with
--itrace=il. For example, to translate the ETM trace from perf.data into
last branch records in a new inj.data file:

    $ perf inject --itrace=i100000il128 -i perf.data -o perf.data.new

The 'i' parameter to itrace generates periodic instruction events.  The
period between instruction events can be specified as a number of
instructions suffixed by i (default 100000).

The parameter to 'l' specifies the number of entries in the branch stack
attached to instruction events.

The 'b' parameter to itrace generates events on taken branches.

This patch also fixes the contents of the branch events used in perf
report - previously branch events were generated for each contiguous
range of instructions executed.  These are fixed to generate branch
events between the last address of a range ending in an executed branch
instruction and the start address of the next range.

Based on patches by Sebastian Pop  with additional fixes
and support for specifying the instruction period.

Originally-by: Sebastian Pop 
Signed-off-by: Robert Walker 
Acked-by: Mathieu Poirier 
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1518607481-4059-2-git-send-email-robert.walker@arm.com
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add functionality to communicate with the openCSD decoder

2018-01-25T09:37:26+00:00

This patch adds functions to communicate with the openCSD trace decoder,
more specifically to access program memory, fetch trace packets and
reset the decoder.

Co-authored-by: Tor Jeremiassen 
Signed-off-by: Mathieu Poirier 
Acked-by: Jiri Olsa 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Kim Phillips 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Suzuki Poulouse 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1516211539-5166-7-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add support for decoding CoreSight trace data

2018-01-25T09:37:25+00:00

Adding functionality to create a CoreSight trace decoder capable
of decoding trace data pushed by a client application.

Co-authored-by: Tor Jeremiassen 
Signed-off-by: Mathieu Poirier 
Acked-by: Jiri Olsa 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Kim Phillips 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Suzuki Poulouse 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1516211539-5166-6-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add decoder mechanic to support dumping trace data

2018-01-25T09:37:25+00:00

This patch adds the required interface to the openCSD library to support
dumping CoreSight trace packet using the "report --dump" command.  The
information conveyed is related to the type of packets gathered by a
trace session rather than full decoding.

Co-authored-by: Tor Jeremiassen 
Signed-off-by: Mathieu Poirier 
Acked-by: Jiri Olsa 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Kim Phillips 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Suzuki Poulouse 
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1516211539-5166-5-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo