Messages in this thread | | | Date | Wed, 21 Jul 2021 10:05:23 -0600 | From | Mathieu Poirier <> | Subject | Re: [PATCH v2 6/6] perf cs-etm: Pass unformatted flag to decoder |
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On Wed, Jul 21, 2021 at 04:02:02PM +0100, James Clark wrote: > The TRBE (Trace Buffer Extension) feature allows a separate trace buffer > for each trace source, therefore the trace wouldn't need to be > formatted. The driver was introduced in commit 3fbf7f011f24 > ("coresight: sink: Add TRBE driver"). > > The formatted/unformatted mode is encoded in one of the flags of the > AUX record. The first AUX record encountered for each event is used to > determine the mode, and this will persist for the remaining trace that > is either decoded or dumped. > > Signed-off-by: James Clark <james.clark@arm.com> > --- > .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 4 +- > tools/perf/util/cs-etm.c | 53 ++++++++++++++----- > 2 files changed, 42 insertions(+), 15 deletions(-) >
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Arnaldo, please consider adding this set to your tree.
Thanks, Mathieu
> 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 ed1f0326f859..9c9039ae6989 100644 > --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c > +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c > @@ -687,7 +687,7 @@ cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params, > } > > struct cs_etm_decoder * > -cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params, > +cs_etm_decoder__new(int decoders, struct cs_etm_decoder_params *d_params, > struct cs_etm_trace_params t_params[]) > { > struct cs_etm_decoder *decoder; > @@ -732,7 +732,7 @@ cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params, > /* init raw frame logging if required */ > cs_etm_decoder__init_raw_frame_logging(d_params, decoder); > > - for (i = 0; i < num_cpu; i++) { > + for (i = 0; i < decoders; i++) { > ret = cs_etm_decoder__create_etm_decoder(d_params, > &t_params[i], > decoder); > diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c > index 760050ea936d..f4b2bff533f3 100644 > --- a/tools/perf/util/cs-etm.c > +++ b/tools/perf/util/cs-etm.c > @@ -461,13 +461,14 @@ static void cs_etm__set_trace_param_etmv4(struct cs_etm_trace_params *t_params, > } > > static int cs_etm__init_trace_params(struct cs_etm_trace_params *t_params, > - struct cs_etm_auxtrace *etm) > + struct cs_etm_auxtrace *etm, > + int decoders) > { > int i; > u32 etmidr; > u64 architecture; > > - for (i = 0; i < etm->num_cpu; i++) { > + for (i = 0; i < decoders; i++) { > architecture = etm->metadata[i][CS_ETM_MAGIC]; > > switch (architecture) { > @@ -488,7 +489,8 @@ static int cs_etm__init_trace_params(struct cs_etm_trace_params *t_params, > > static int cs_etm__init_decoder_params(struct cs_etm_decoder_params *d_params, > struct cs_etm_queue *etmq, > - enum cs_etm_decoder_operation mode) > + enum cs_etm_decoder_operation mode, > + bool formatted) > { > int ret = -EINVAL; > > @@ -498,7 +500,7 @@ static int cs_etm__init_decoder_params(struct cs_etm_decoder_params *d_params, > d_params->packet_printer = cs_etm__packet_dump; > d_params->operation = mode; > d_params->data = etmq; > - d_params->formatted = true; > + d_params->formatted = formatted; > d_params->fsyncs = false; > d_params->hsyncs = false; > d_params->frame_aligned = true; > @@ -720,11 +722,17 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id, > return len; > } > > -static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm) > +static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm, > + bool formatted) > { > struct cs_etm_decoder_params d_params; > struct cs_etm_trace_params *t_params = NULL; > struct cs_etm_queue *etmq; > + /* > + * Each queue can only contain data from one CPU when unformatted, so only one decoder is > + * needed. > + */ > + int decoders = formatted ? etm->num_cpu : 1; > > etmq = zalloc(sizeof(*etmq)); > if (!etmq) > @@ -735,21 +743,23 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm) > goto out_free; > > /* Use metadata to fill in trace parameters for trace decoder */ > - t_params = zalloc(sizeof(*t_params) * etm->num_cpu); > + t_params = zalloc(sizeof(*t_params) * decoders); > > if (!t_params) > goto out_free; > > - if (cs_etm__init_trace_params(t_params, etm)) > + if (cs_etm__init_trace_params(t_params, etm, decoders)) > goto out_free; > > /* Set decoder parameters to decode trace packets */ > if (cs_etm__init_decoder_params(&d_params, etmq, > dump_trace ? CS_ETM_OPERATION_PRINT : > - CS_ETM_OPERATION_DECODE)) > + CS_ETM_OPERATION_DECODE, > + formatted)) > goto out_free; > > - etmq->decoder = cs_etm_decoder__new(etm->num_cpu, &d_params, t_params); > + etmq->decoder = cs_etm_decoder__new(decoders, &d_params, > + t_params); > > if (!etmq->decoder) > goto out_free; > @@ -777,14 +787,15 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm) > > static int cs_etm__setup_queue(struct cs_etm_auxtrace *etm, > struct auxtrace_queue *queue, > - unsigned int queue_nr) > + unsigned int queue_nr, > + bool formatted) > { > struct cs_etm_queue *etmq = queue->priv; > > if (list_empty(&queue->head) || etmq) > return 0; > > - etmq = cs_etm__alloc_queue(etm); > + etmq = cs_etm__alloc_queue(etm, formatted); > > if (!etmq) > return -ENOMEM; > @@ -2430,8 +2441,14 @@ static int cs_etm__process_auxtrace_event(struct perf_session *session, > if (err) > return err; > > + /* > + * Knowing if the trace is formatted or not requires a lookup of > + * the aux record so only works in non-piped mode where data is > + * queued in cs_etm__queue_aux_records(). Always assume > + * formatted in piped mode (true). > + */ > err = cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], > - idx); > + idx, true); > if (err) > return err; > > @@ -2678,6 +2695,7 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o > union perf_event auxtrace_fragment; > __u64 aux_offset, aux_size; > __u32 idx; > + bool formatted; > > struct cs_etm_auxtrace *etm = container_of(session->auxtrace, > struct cs_etm_auxtrace, > @@ -2745,7 +2763,9 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o > return err; > > idx = auxtrace_event->idx; > - return cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], idx); > + formatted = !(aux_event->flags & PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW); > + return cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], > + idx, formatted); > } > > /* Wasn't inside this buffer, but there were no parse errors. 1 == 'not found' */ > @@ -3034,6 +3054,13 @@ int cs_etm__process_auxtrace_info(union perf_event *event, > goto err_delete_thread; > > etm->data_queued = etm->queues.populated; > + /* > + * Print warning in pipe mode, see cs_etm__process_auxtrace_event() and > + * cs_etm__queue_aux_fragment() for details relating to limitations. > + */ > + if (!etm->data_queued) > + pr_warning("CS ETM warning: Coresight decode and TRBE support requires random file access.\n" > + "Continuing with best effort decoding in piped mode.\n\n"); > > return 0; > > -- > 2.28.0 >
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