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perf inject: Emit instruction records on ETM trace discontinuity

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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>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1518607481-4059-3-git-send-email-robert.walker@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Robert Walker
2018-02-14 11:24:40 +00:00
committed by Arnaldo Carvalho de Melo
parent e573e978fb
commit 256e751cac
3 changed files with 67 additions and 23 deletions
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9
tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
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@@ -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: