kernel/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h, branch linux-5.2.y

perf cs-etm: Make cs_etm__run_decoder() queue independent

2019-02-14T18:18:07Z

This patch makes decoding of auxtrace buffer centered around a struct cs_etm_queue. This eliminates surperflous variables and is a precursor for work that simplifies the main decoder loop. Signed-off-by: Mathieu Poirier Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Suzuki K Poulouse Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190212171618.25355-11-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Introducing function cs_etm_decoder__init_dparams()

2019-02-14T18:18:06Z

Introducing function cs_etm_decoder__init_dparams() to avoid repeating code at two different places. Signed-off-by: Mathieu Poirier Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Suzuki K Poulouse Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190212171618.25355-5-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Add traceID in packet

2019-02-06T13:00:40Z

Add traceID in packet, thus we can use traceID to retrieve metadata pointer from traceID-metadata tuple. 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/20190129122842.32041-7-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Add exception number in exception packet

2019-02-06T13:00:40Z

When an exception packet comes, it contains the information for exception number; the exception number indicates the exception types, so from it we can know if the exception is taken for interrupt, system call or other traps, etc. This patch simply adds a field in cs_etm_packet struct, it records exception number for exception packet that will then be used to properly identify exception types to the perf synthesize mechanic. 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/20190129122842.32041-5-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Set sample flags for instruction range packet

2019-02-06T13:00:40Z

The perf sample data contains flags to indicate the hardware trace data is belonging to which type branch instruction, thus this can be used to print out the human readable string. Arm CoreSight ETM sample data is missed to set flags and it is always set to zeros, this results in perf tool skips to print string for instruction types. This patch is to set branch instruction flags for instruction range packet. 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/20190129122842.32041-3-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Add last instruction information in packet

2019-02-06T13:00:40Z

Decoder provides last instruction related information, these information can be used for trace analysis; specifically we can get to know what kind of branch instruction has been executed, mainly the information are contained in three element fields: last_i_type: this is significant type for waypoint calculation, it indicates the last instruction is one of immediate branch instruction, indirect branch instruction, instruction barrier (ISB), or data barrier (DSB/DMB). last_i_subtype: this is used for instruction sub type, it can be branch with link, ARMv8 return instruction, ARMv8 eret instruction (return from exception), or ARMv7 instruction which could imply return (e.g. MOV PC, LR; POP { ,PC}). last_instr_cond: it indicates if the last instruction was conditional. But these three fields are not saved into cs_etm_packet struct, thus cs-etm layer don't know related information and cannot generate sample flags for branch instructions. This patch add corresponding three new fields in cs_etm_packet struct and save related value into the packet structure, it is preparation for supporting sample flags. 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/20190129122842.32041-2-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Generate branch sample for exception packet

2018-12-18T15:24:00Z

The exception packet appears as one element with 'elem_type' == OCSD_GEN_TRC_ELEM_EXCEPTION or OCSD_GEN_TRC_ELEM_EXCEPTION_RET, which is present for exception entry and exit respectively. The decoder sets the packet fields 'packet->exc' and 'packet->exc_ret' to indicate the exception packets; but exception packets don't have a dedicated sample type and shares the same sample type CS_ETM_RANGE with normal instruction packets. As a result, the exception packets are taken as normal instruction packets and this introduces confusion in mixing different packet types. Furthermore, these instruction range packets will be processed for branch samples only when 'packet->last_instr_taken_branch' is true, otherwise they will be omitted, this can introduce a mess for exception and exception returning due to not having the complete address range info for context switching. To process exception packets properly, this patch introduces two new sample types: CS_ETM_EXCEPTION and CS_ETM_EXCEPTION_RET; these two types of packets will be handled by cs_etm__exception(). The function cs_etm__exception() forces setting the previous CS_ETM_RANGE packet flag 'prev_packet->last_instr_taken_branch' to true, this matches well with the program flow when the exception is trapped from user space to kernel space, no matter if the most recent flow has branch taken or not; this is also safe for returning to user space after exception handling. After exception packets have their own sample type, the packet fields 'packet->exc' and 'packet->exc_ret' aren't needed anymore, so remove them. 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: coresight ml Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-9-git-send-email-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY

2018-12-18T15:23:59Z

TRACE_ON element is used at the beginning of trace, it also can be appeared in the middle of trace data to indicate discontinuity; for example, it's possible to see multiple TRACE_ON elements in the trace stream if the trace is being limited by address range filtering. Furthermore, except TRACE_ON element is for discontinuity, NO_SYNC and EO_TRACE also can be used to indicate discontinuity, though they are used for different scenarios for which the trace is interrupted. This patch renames sample type CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY, firstly the new name describes more closely the purpose of the packet; secondly this is a preparation for other output elements which also cause the trace discontinuity thus they can share the same one packet type. 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: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-6-git-send-email-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Refactor enumeration cs_etm_sample_type

2018-12-18T15:23:59Z

The values in enumeration cs_etm_sample_type are defined with setting bit N for each packet type, this is not suggested in the usual case. This patch refactor cs_etm_sample_type by converting from bit shifting values to continuous numbers. 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: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-5-git-send-email-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Add support for PTMv1.1 decoding

2018-12-17T17:59:01Z

This patch is re-using the mechanic set forth by ETMv3 to add support for PTM decoding. Configuration for both encoding protocol is similar but the generated stream itself is very different, hence requiring special handling. Signed-off-by: Mathieu Poirier Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1543955944-10042-4-git-send-email-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo