From: Robert Walker <robert.walker@arm.com> To: acme@kernel.org, Mathieu Poirier <mathieu.poirier@linaro.org>, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Robert Walker <robert.walker@arm.com>, coresight@lists.linaro.org Subject: [PATCH v2 2/3] perf inject: Emit instruction records on ETM trace discontinuity Date: Wed, 14 Feb 2018 11:24:40 +0000 [thread overview] Message-ID: <1518607481-4059-3-git-send-email-robert.walker@arm.com> (raw) In-Reply-To: <1518607481-4059-1-git-send-email-robert.walker@arm.com> 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 <robert.walker@arm.com> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 9 +++ tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 1 + tools/perf/util/cs-etm.c | 80 ++++++++++++++++++------- 3 files changed, 67 insertions(+), 23 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 8ff69df..640af88 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -328,7 +328,14 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, } return ret; +} +static ocsd_datapath_resp_t +cs_etm_decoder__buffer_trace_on(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); } static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( @@ -347,6 +354,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( 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: 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 a4fdd28..743f5f4 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h @@ -24,6 +24,7 @@ struct cs_etm_buffer { enum cs_etm_sample_type { CS_ETM_RANGE = 1 << 0, + CS_ETM_TRACE_ON = 1 << 1, }; struct cs_etm_packet { diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 6e595d9..1b0d422 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -867,6 +867,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) */ if (etm->synth_opts.last_branch && etmq->prev_packet && + etmq->prev_packet->sample_type == CS_ETM_RANGE && etmq->prev_packet->last_instr_taken_branch) cs_etm__update_last_branch_rb(etmq); @@ -920,6 +921,40 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) return 0; } +static int cs_etm__flush(struct cs_etm_queue *etmq) +{ + int err = 0; + struct cs_etm_packet *tmp; + + if (etmq->etm->synth_opts.last_branch && + etmq->prev_packet && + etmq->prev_packet->sample_type == CS_ETM_RANGE) { + /* + * Generate a last branch event for the branches left in the + * circular buffer at the end of the trace. + * + * 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); + etmq->period_instructions = 0; + + /* + * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for + * the next incoming packet. + */ + tmp = etmq->packet; + etmq->packet = etmq->prev_packet; + etmq->prev_packet = tmp; + } + + return err; +} + static int cs_etm__run_decoder(struct cs_etm_queue *etmq) { struct cs_etm_auxtrace *etm = etmq->etm; @@ -971,32 +1006,31 @@ static int cs_etm__run_decoder(struct cs_etm_queue *etmq) */ break; - /* - * If the packet contains an instruction - * range, generate instruction sequence - * events. - */ - if (etmq->packet->sample_type & CS_ETM_RANGE) - err = cs_etm__sample(etmq); + switch (etmq->packet->sample_type) { + case CS_ETM_RANGE: + /* + * If the packet contains an instruction + * range, generate instruction sequence + * events. + */ + cs_etm__sample(etmq); + break; + case CS_ETM_TRACE_ON: + /* + * Discontinuity in trace, flush + * previous branch stack + */ + cs_etm__flush(etmq); + break; + default: + break; + } } } while (buffer.len > buffer_used); - /* - * Generate a last branch event for the branches left in - * the circular buffer at the end of the trace. - */ - if (etm->sample_instructions && - etmq->etm->synth_opts.last_branch) { - struct branch_stack *bs = etmq->last_branch_rb; - struct branch_entry *be = - &bs->entries[etmq->last_branch_pos]; - - err = cs_etm__synth_instruction_sample( - etmq, be->to, etmq->period_instructions); - if (err) - return err; - } - + if (err == 0) + /* Flush any remaining branch stack entries */ + err = cs_etm__flush(etmq); } return err; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: robert.walker@arm.com (Robert Walker) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 2/3] perf inject: Emit instruction records on ETM trace discontinuity Date: Wed, 14 Feb 2018 11:24:40 +0000 [thread overview] Message-ID: <1518607481-4059-3-git-send-email-robert.walker@arm.com> (raw) In-Reply-To: <1518607481-4059-1-git-send-email-robert.walker@arm.com> 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 <robert.walker@arm.com> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 9 +++ tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 1 + tools/perf/util/cs-etm.c | 80 ++++++++++++++++++------- 3 files changed, 67 insertions(+), 23 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 8ff69df..640af88 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -328,7 +328,14 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder, } return ret; +} +static ocsd_datapath_resp_t +cs_etm_decoder__buffer_trace_on(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); } static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( @@ -347,6 +354,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( 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: 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 a4fdd28..743f5f4 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h @@ -24,6 +24,7 @@ struct cs_etm_buffer { enum cs_etm_sample_type { CS_ETM_RANGE = 1 << 0, + CS_ETM_TRACE_ON = 1 << 1, }; struct cs_etm_packet { diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 6e595d9..1b0d422 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -867,6 +867,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) */ if (etm->synth_opts.last_branch && etmq->prev_packet && + etmq->prev_packet->sample_type == CS_ETM_RANGE && etmq->prev_packet->last_instr_taken_branch) cs_etm__update_last_branch_rb(etmq); @@ -920,6 +921,40 @@ static int cs_etm__sample(struct cs_etm_queue *etmq) return 0; } +static int cs_etm__flush(struct cs_etm_queue *etmq) +{ + int err = 0; + struct cs_etm_packet *tmp; + + if (etmq->etm->synth_opts.last_branch && + etmq->prev_packet && + etmq->prev_packet->sample_type == CS_ETM_RANGE) { + /* + * Generate a last branch event for the branches left in the + * circular buffer at the end of the trace. + * + * 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); + etmq->period_instructions = 0; + + /* + * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for + * the next incoming packet. + */ + tmp = etmq->packet; + etmq->packet = etmq->prev_packet; + etmq->prev_packet = tmp; + } + + return err; +} + static int cs_etm__run_decoder(struct cs_etm_queue *etmq) { struct cs_etm_auxtrace *etm = etmq->etm; @@ -971,32 +1006,31 @@ static int cs_etm__run_decoder(struct cs_etm_queue *etmq) */ break; - /* - * If the packet contains an instruction - * range, generate instruction sequence - * events. - */ - if (etmq->packet->sample_type & CS_ETM_RANGE) - err = cs_etm__sample(etmq); + switch (etmq->packet->sample_type) { + case CS_ETM_RANGE: + /* + * If the packet contains an instruction + * range, generate instruction sequence + * events. + */ + cs_etm__sample(etmq); + break; + case CS_ETM_TRACE_ON: + /* + * Discontinuity in trace, flush + * previous branch stack + */ + cs_etm__flush(etmq); + break; + default: + break; + } } } while (buffer.len > buffer_used); - /* - * Generate a last branch event for the branches left in - * the circular buffer at the end of the trace. - */ - if (etm->sample_instructions && - etmq->etm->synth_opts.last_branch) { - struct branch_stack *bs = etmq->last_branch_rb; - struct branch_entry *be = - &bs->entries[etmq->last_branch_pos]; - - err = cs_etm__synth_instruction_sample( - etmq, be->to, etmq->period_instructions); - if (err) - return err; - } - + if (err == 0) + /* Flush any remaining branch stack entries */ + err = cs_etm__flush(etmq); } return err; -- 2.7.4
next prev parent reply other threads:[~2018-02-14 11:25 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-02-14 11:24 [PATCH v2 0/3] Perf inject for ETM trace Robert Walker 2018-02-14 11:24 ` Robert Walker 2018-02-14 11:24 ` [PATCH v2 1/3] perf tools: inject capabilitity for CoreSight traces Robert Walker 2018-02-14 11:24 ` Robert Walker 2018-02-17 11:32 ` [tip:perf/core] perf cs-etm: Inject " tip-bot for Robert Walker 2018-02-14 11:24 ` Robert Walker [this message] 2018-02-14 11:24 ` [PATCH v2 2/3] perf inject: Emit instruction records on ETM trace discontinuity Robert Walker 2018-02-17 11:32 ` [tip:perf/core] " tip-bot for Robert Walker 2018-02-14 11:24 ` [PATCH v2 3/3] coresight: Update documentation for perf usage Robert Walker 2018-02-14 11:24 ` Robert Walker 2018-02-17 11:33 ` [tip:perf/core] " tip-bot for Robert Walker
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