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

perf cs-etm: Add missing case value

2019-03-28T17:31:55Z

The following error was thrown when compiling `tools/perf` using OpenCSD v0.11.1. This patch fixes said error. CC util/intel-pt-decoder/intel-pt-log.o CC util/cs-etm-decoder/cs-etm-decoder.o util/cs-etm-decoder/cs-etm-decoder.c: In function ‘cs_etm_decoder__buffer_range’: util/cs-etm-decoder/cs-etm-decoder.c:370:2: error: enumeration value ‘OCSD_INSTR_WFI_WFE’ not handled in switch [-Werror=switch-enum] switch (elem->last_i_type) { ^~~~~~ CC util/intel-pt-decoder/intel-pt-decoder.o cc1: all warnings being treated as errors Because `OCSD_INSTR_WFI_WFE` case was added only in v0.11.0, the minimum required OpenCSD library version for this patch is no longer v0.10.0. Signed-off-by: Solomon Tan Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Mathieu Poirier Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Robert Walker Cc: Suzuki K Poulouse Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190322052255.GA4809@w-OptiPlex-7050 Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Rename build libperf to perf

2019-02-14T18:18:08Z

Rename build libperf to perf, because it's used to build perf. The libperf build object name will be used for libperf library. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190213123246.4015-4-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

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: Change tuple from traceID-CPU# to traceID-metadata

2019-02-06T13:00:40Z

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

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