CoreSight

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2384 discussions

[PATCH 31/63] perf cs-etm: Treat NO_SYNC element as trace discontinuity

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> The CoreSight tracer driver might insert barrier packets between different buffers, thus the decoder can spot the boundaries based on the barrier packet; it is possible for the decoder to hit a barrier packet and emit a NO_SYNC element, then the decoder will find a periodic synchronisation point inside that next trace block that starts the trace again but does not have the TRACE_ON element as indicator - usually because this trace block has wrapped the buffer so we have lost the original point when the trace was enabled. In the first case it causes the insertion of a OCSD_GEN_TRC_ELEM_NO_SYNC in the middle of the tracing stream, but as we were not handling the NO_SYNC element properly this ends up making users miss the discontinuity indications. Though OCSD_GEN_TRC_ELEM_NO_SYNC is different from CS_ETM_TRACE_ON when output from the decoder, both indicate that the trace data is discontinuous; this patch treats OCSD_GEN_TRC_ELEM_NO_SYNC as a trace discontinuity and generates a CS_ETM_DISCONTINUITY packet for it, so cs-etm can handle the discontinuity for this case, finally it saves the last trace data for the previous trace block and restart samples for the new block. Signed-off-by: Leo Yan <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight ml <coresight(a)lists.linaro.org> Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-7-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 1 - 1 file changed, 1 deletion(-) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index 1039f364f4cc..bee026e76a4c 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -410,7 +410,6 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( case OCSD_GEN_TRC_ELEM_UNKNOWN: break; case OCSD_GEN_TRC_ELEM_NO_SYNC: - break; case OCSD_GEN_TRC_ELEM_TRACE_ON: resp = cs_etm_decoder__buffer_discontinuity(decoder, trace_chan_id); -- 2.19.2

6 years, 6 months

[PATCH 30/63] perf cs-etm: Rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> 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 <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-6-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 10 +++++----- tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 2 +- tools/perf/util/cs-etm.c | 12 ++++++------ 3 files changed, 12 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index 97b39b1f5759..1039f364f4cc 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -390,11 +390,11 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, } static ocsd_datapath_resp_t -cs_etm_decoder__buffer_trace_on(struct cs_etm_decoder *decoder, - const uint8_t trace_chan_id) +cs_etm_decoder__buffer_discontinuity(struct cs_etm_decoder *decoder, + const uint8_t trace_chan_id) { return cs_etm_decoder__buffer_packet(decoder, trace_chan_id, - CS_ETM_TRACE_ON); + CS_ETM_DISCONTINUITY); } static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( @@ -412,8 +412,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( case OCSD_GEN_TRC_ELEM_NO_SYNC: break; case OCSD_GEN_TRC_ELEM_TRACE_ON: - resp = cs_etm_decoder__buffer_trace_on(decoder, - trace_chan_id); + resp = cs_etm_decoder__buffer_discontinuity(decoder, + trace_chan_id); break; case OCSD_GEN_TRC_ELEM_INSTR_RANGE: resp = cs_etm_decoder__buffer_range(decoder, elem, diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h index 3819a04a2c27..a27231722e27 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h @@ -25,7 +25,7 @@ struct cs_etm_buffer { enum cs_etm_sample_type { CS_ETM_EMPTY, CS_ETM_RANGE, - CS_ETM_TRACE_ON, + CS_ETM_DISCONTINUITY, }; enum cs_etm_isa { diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index ffc4fe5c0b7e..cea3158915d3 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -562,8 +562,8 @@ static inline int cs_etm__t32_instr_size(struct cs_etm_queue *etmq, static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) { - /* Returns 0 for the CS_ETM_TRACE_ON packet */ - if (packet->sample_type == CS_ETM_TRACE_ON) + /* Returns 0 for the CS_ETM_DISCONTINUITY packet */ + if (packet->sample_type == CS_ETM_DISCONTINUITY) return 0; return packet->start_addr; @@ -572,8 +572,8 @@ static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) static inline u64 cs_etm__last_executed_instr(const struct cs_etm_packet *packet) { - /* Returns 0 for the CS_ETM_TRACE_ON packet */ - if (packet->sample_type == CS_ETM_TRACE_ON) + /* Returns 0 for the CS_ETM_DISCONTINUITY packet */ + if (packet->sample_type == CS_ETM_DISCONTINUITY) return 0; return packet->end_addr - packet->last_instr_size; @@ -972,7 +972,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) bool generate_sample = false; /* Generate sample for tracing on packet */ - if (etmq->prev_packet->sample_type == CS_ETM_TRACE_ON) + if (etmq->prev_packet->sample_type == CS_ETM_DISCONTINUITY) generate_sample = true; /* Generate sample for branch taken packet */ @@ -1148,7 +1148,7 @@ static int cs_etm__run_decoder(struct cs_etm_queue *etmq) */ cs_etm__sample(etmq); break; - case CS_ETM_TRACE_ON: + case CS_ETM_DISCONTINUITY: /* * Discontinuity in trace, flush * previous branch stack -- 2.19.2

6 years, 6 months

[PATCH 29/63] perf cs-etm: Refactor enumeration cs_etm_sample_type

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> 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 <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-5-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h index b295dd2b8292..3819a04a2c27 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h @@ -23,9 +23,9 @@ struct cs_etm_buffer { }; enum cs_etm_sample_type { - CS_ETM_EMPTY = 0, - CS_ETM_RANGE = 1 << 0, - CS_ETM_TRACE_ON = 1 << 1, + CS_ETM_EMPTY, + CS_ETM_RANGE, + CS_ETM_TRACE_ON, }; enum cs_etm_isa { -- 2.19.2

6 years, 6 months

[PATCH 28/63] perf cs-etm: Remove unused 'trace_on' in cs_etm_decoder

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> cs_etm_decoder::trace_on is being assigned when TRACE_ON or NO_SYNC element is coming, but it is never used hence it is redundant and can be removed. So let's remove 'trace_on' field from cs_etm_decoder struct. Suggested-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Signed-off-by: Leo Yan <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-4-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index 0b4c8629f578..97b39b1f5759 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -36,7 +36,6 @@ struct cs_etm_decoder { void *data; void (*packet_printer)(const char *msg); - bool trace_on; dcd_tree_handle_t dcd_tree; cs_etm_mem_cb_type mem_access; ocsd_datapath_resp_t prev_return; @@ -411,12 +410,10 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( case OCSD_GEN_TRC_ELEM_UNKNOWN: break; case OCSD_GEN_TRC_ELEM_NO_SYNC: - decoder->trace_on = false; break; case OCSD_GEN_TRC_ELEM_TRACE_ON: resp = cs_etm_decoder__buffer_trace_on(decoder, trace_chan_id); - decoder->trace_on = true; break; case OCSD_GEN_TRC_ELEM_INSTR_RANGE: resp = cs_etm_decoder__buffer_range(decoder, elem, -- 2.19.2

6 years, 6 months

[PATCH 27/63] perf cs-etm: Avoid stale branch samples when flush packet

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> At the end of trace buffer handling, function cs_etm__flush() is invoked to flush any remaining branch stack entries. As a side effect, it also generates branch sample, because the 'etmq->packet' doesn't contains any new coming packet but point to one stale packet after packets swapping, so it wrongly makes synthesize branch samples with stale packet info. We could review below detailed flow which causes issue: Packet1: start_addr=0xffff000008b1fbf0 end_addr=0xffff000008b1fbfc Packet2: start_addr=0xffff000008b1fb5c end_addr=0xffff000008b1fb6c step 1: cs_etm__sample(): sample: ip=(0xffff000008b1fbfc-4) addr=0xffff000008b1fb5c step 2: flush packet in cs_etm__run_decoder(): cs_etm__run_decoder() `-> err = cs_etm__flush(etmq, false); sample: ip=(0xffff000008b1fb6c-4) addr=0xffff000008b1fbf0 Packet1 and packet2 are two continuous packets, when packet2 is the new coming packet, cs_etm__sample() generates branch sample for these two packets and use [packet1::end_addr - 4 => packet2::start_addr] as branch jump flow, thus we can see the first generated branch sample in step 1. At the end of cs_etm__sample() it swaps packets so 'etm->prev_packet'= packet2 and 'etm->packet'=packet1, so far it's okay for branch sample. If packet2 is the last one packet in trace buffer, even there have no any new coming packet, cs_etm__run_decoder() invokes cs_etm__flush() to flush branch stack entries as expected, but it also generates branch samples by taking 'etm->packet' as a new coming packet, thus the branch jump flow is as [packet2::end_addr - 4 => packet1::start_addr]; this is the second sample which is generated in step 2. So actually the second sample is a stale sample and we should not generate it. This patch introduces a new function cs_etm__end_block(), at the end of trace block this function is invoked to only flush branch stack entries and thus can avoid to generate branch sample for stale packet. Signed-off-by: Leo Yan <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-3-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 789707bc4e9e..ffc4fe5c0b7e 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -1055,6 +1055,39 @@ static int cs_etm__flush(struct cs_etm_queue *etmq) return err; } +static int cs_etm__end_block(struct cs_etm_queue *etmq) +{ + int err; + + /* + * It has no new packet coming and 'etmq->packet' contains the stale + * packet which was set at the previous time with packets swapping; + * so skip to generate branch sample to avoid stale packet. + * + * For this case only flush branch stack and generate a last branch + * event for the branches left in the circular buffer at the end of + * the trace. + */ + if (etmq->etm->synth_opts.last_branch && + etmq->prev_packet->sample_type == CS_ETM_RANGE) { + /* + * Use the address of the end of the last reported execution + * range. + */ + u64 addr = cs_etm__last_executed_instr(etmq->prev_packet); + + err = cs_etm__synth_instruction_sample( + etmq, addr, + etmq->period_instructions); + if (err) + return err; + + etmq->period_instructions = 0; + } + + return 0; +} + static int cs_etm__run_decoder(struct cs_etm_queue *etmq) { struct cs_etm_auxtrace *etm = etmq->etm; @@ -1137,7 +1170,7 @@ static int cs_etm__run_decoder(struct cs_etm_queue *etmq) if (err == 0) /* Flush any remaining branch stack entries */ - err = cs_etm__flush(etmq); + err = cs_etm__end_block(etmq); } return err; -- 2.19.2

6 years, 6 months

[PATCH 26/63] perf cs-etm: Correct packets swapping in cs_etm__flush()

by Arnaldo Carvalho de Melo

From: Leo Yan <leo.yan(a)linaro.org> The structure cs_etm_queue uses 'prev_packet' to point to previous packet, this can be used to combine with new coming packet to generate samples. In function cs_etm__flush() it swaps packets only when the flag 'etm->synth_opts.last_branch' is true, this means that it will not swap packets if without option '--itrace=il' to generate last branch entries; thus for this case the 'prev_packet' doesn't point to the correct previous packet and the stale packet still will be used to generate sequential sample. Thus if dump trace with 'perf script' command we can see the incorrect flow with the stale packet's address info. This patch corrects packets swapping in cs_etm__flush(); except using the flag 'etm->synth_opts.last_branch' it also checks the another flag 'etm->sample_branches', if any flag is true then it swaps packets so can save correct content to 'prev_packet'. Finally this can fix the wrong program flow dumping issue. The patch has a minor refactoring to use 'etm->synth_opts.last_branch' instead of 'etmq->etm->synth_opts.last_branch' for condition checking, this is consistent with that is done in cs_etm__sample(). Signed-off-by: Leo Yan <leo.yan(a)linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Robert Walker <robert.walker(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Link: http://lkml.kernel.org/r/1544513908-16805-2-git-send-email-leo.yan@linaro.o… Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> --- tools/perf/util/cs-etm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 23159c33db2a..789707bc4e9e 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -1042,7 +1042,7 @@ static int cs_etm__flush(struct cs_etm_queue *etmq) } swap_packet: - if (etmq->etm->synth_opts.last_branch) { + if (etm->sample_branches || etm->synth_opts.last_branch) { /* * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for * the next incoming packet. -- 2.19.2

6 years, 6 months

[PATCH v3 0/5] perf cs-etm: Add support for sample flags

by Leo Yan

This patch seris adds support for sample flags so can facilitate perf to print sample flags for branch instruction. Patch 0001 is used to save last branch information in packet structure, this includes instruction type, subtype and condition flag to help making decision for which branch instruction it is. It passes related information from decoder layer to cs-etm.c, so we use cs-etm.c as a central place to set sample flags. Patch 0002 is used to set sample flags for instruction range packet. Patch 0003 is used to set sample flags for trace discontinuity packet. Patch 0004 addes exception number in packet, so this is preparation for patch 0005 to set sample flags for exception packet; patch 0005 support ETMv3/ETMv4 exception packet together. The patch series is based on OpenCSD v0.10.0 and later versions (so far the latest version is v0.10.1 when wrote this patch series). This patch series is applied on the acme's perf core branch [1] with the with latest commit aaab25f03e9e ("perf trace: Allow selecting use the use of the ordered_events code") and has dependency on patch series 'perf cs-etm: Correct packets handling' [2]. After applying the dependency patches and this patch series, we can verify sample flags with below command: # perf script -F,-time,+flags,+ip,+sym,+dso,+addr,+symoff -k vmlinux Changes from v1: * Addressed Mathieu's suggestion to split one big patch to 3 small patches for setting sample flags, one is for instruction range packet, one is for discontinuity packet and one is for exception packet. * Added supporting for ETMv3 exception packet. * Followed Mathieu's suggestion to move all sample flags handling from decoder layer to cs-etm.c, thus it has enough info to set flags based on trace context in single place. Changes from v1: * Moved exception packets handling patches into patch series 'perf cs-etm: Correct packets handling'. * Added sample flags fixing up for TRACE_OFF packet. * Created a new function which is used to maintain flags fixing up. [1] https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=perf/… [2] https://lkml.org/lkml/2018/12/11/73 Leo Yan (5): perf cs-etm: Add last instruction information in packet perf cs-etm: Set sample flags for instruction range packet perf cs-etm: Set sample flags for trace discontinuity perf cs-etm: Add exception number in exception packet perf cs-etm: Set sample flags for exception packet tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 29 ++- tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 5 + tools/perf/util/cs-etm.c | 227 +++++++++++++++++++++++- tools/perf/util/cs-etm.h | 36 ++++ 4 files changed, 291 insertions(+), 6 deletions(-) -- 2.7.4

6 years, 6 months

[PATCH v2 0/6] perf cs-etm: Correct packets handling

by Leo Yan

perf cs-etm module converts decoder elements to packets and then we have more context crossing packets to generate synthenize samples, finally perf tool can faciliate samples for statistics and report the results. This patch series is to address several issues found related with packets handling and samples generation when worked firstly on branch sample flags support for Arm CoreSight trace data, so this patch series is dependency for sample flags setting, will send another dedicated patch series for sample flags later. In this patch series, the first two patches are mainly to fix issues in cs_etm__flush(): patch 0001 corrects packets swapping in cs_etm__flush() and this can fix the wrong branch sample caused by the missed packets swapping; patch 0002 is to fix the wrong samples generation with stale packets at the end of trace block. Patch 0003 is to rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY, we use a more general packet type to present trace discontinuity, so it can be used by TRACE_ON event, and also can be used by NO_SYNC and EO_TRACE elements. Patch 0004 is used to support NO_SYNC packet, otherwise the trace decoding cannot reflect the tracing discontinuity caused by NO_SYNC packet. Patch 0005 is used to support EO_TRACE packet, which also introduces the tracing discontinuity at the end of trace and we should save last trace data for it. Patch 0006 is used to generate branch sample for exception packets. This patch series is applied on the acme's perf/core branch [1] with latest commit 4085fed6373f ("perf trace: Add ordered processing"); Since Rob's patch 'perf: Support for Arm A32/T32 instruction sets in CoreSight trace' has been merged into perf/core branch, this patch series can directly be applied onto perf/core branch. With applying the dependency patch, this patch series has been tested for branch samples dumping with below command on Juno board: # perf script -F,-time,+ip,+sym,+dso,+addr,+symoff -k vmlinux Changes from v1: * Synced the consistent code in patch 0001 for condition checking. * Introduced new function cs_etm__end_block() for flushing packet at the end of trace block. * Added new patch 0003 to rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY. * Used the same one packet type CS_ETM_DISCONTINUITY for all trace discontinuity (include support TRACE_ON/EO_TRACE/NO_SYNC packets). * Removed tracking exception number patch, which will be added in sample flag patch series. Leo Yan (6): perf cs-etm: Correct packets swapping in cs_etm__flush() perf cs-etm: Avoid stale branch samples when flush packet perf cs-etm: Rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY perf cs-etm: Treat NO_SYNC element as trace discontinuity perf cs-etm: Treat EO_TRACE element as trace discontinuity perf cs-etm: Generate branch sample for exception packet tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 40 +++++++++---- tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 10 ++-- tools/perf/util/cs-etm.c | 77 ++++++++++++++++++++++--- 3 files changed, 102 insertions(+), 25 deletions(-) -- 2.7.4

6 years, 6 months

OpenCSD v0.10.1 patch release.

by Mike Leach

Patch release incorporating build dependency updates from pull request #14 Minor change to auto-fdo document. No functionality changes. -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

6 years, 6 months

Re: [Linaro/OpenCSD] opencsd: Add enumeration for exception number (#15)

by Mike Leach

Hi Leo, This information should not be added to the library here - for a number of reasons:- 1) It adds a type that is not actually used in the library - and a maintenance burden that is unrelated to the library. 2) It adds another compile time dependence between perf and the version of the library installed. 3) Exception number mapping to type of exception differs between trace protocols - for example exception number values output for ETMv3 differ from those used in ETMv4 - PE reset is 0b1000 in ETMv3, 0b00000 in ETMv4. This is why we output the exception number rather than type in the generic packets. Clients can map an exception number to particular type as they will know the trace protocol and core architecture. My recommendation is that the exception type mapping if required by perf is localised to the perf etm decoder code - cs-etm.h or cs-etm-decoder.h - and care must be taken to map exception types according to underlying protocol as well as number. Regards Mike On Mon, 10 Dec 2018 at 05:14, Leo Yan <notifications(a)github.com> wrote: > Add enumeration for exception number in header file, this can be used > for Linux perf tool building to support sample flags setting. > > Signed-off-by: Leo Yan leo.yan(a)linaro.org > ------------------------------ > You can view, comment on, or merge this pull request online at: > > https://github.com/Linaro/OpenCSD/pull/15 > Commit Summary > > - opencsd: Add enumeration for exception number > > File Changes > > - *M* decoder/include/opencsd/ocsd_if_types.h > <https://github.com/Linaro/OpenCSD/pull/15/files#diff-0> (16) > > Patch Links: > > - https://github.com/Linaro/OpenCSD/pull/15.patch > - https://github.com/Linaro/OpenCSD/pull/15.diff > > — > You are receiving this because you are subscribed to this thread. > Reply to this email directly, view it on GitHub > <https://github.com/Linaro/OpenCSD/pull/15>, or mute the thread > <https://github.com/notifications/unsubscribe-auth/AMvws3K9wHZ_EjfD42kq1704q…> > . > -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

6 years, 6 months

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