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perf cs-etm: Add helper cs_etm__get_pid_fmt() 

This patch adds helper function cs_etm__get_pid_fmt(), by passing
parameter "traceID", it returns the PID format.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Link: https://lore.kernel.org/r/20210213113220.292229-5-leo.yan@linaro.org
Link: https://lore.kernel.org/r/20210224164835.3497311-6-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2021-02-24 09:48:34 -07:00 committed by Arnaldo Carvalho de Melo
parent 30cb76aabf
commit 47f0d94c20
2 changed files with 43 additions and 0 deletions
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42
tools/perf/util/cs-etm.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/bitops.h>
#include <linux/coresight-pmu.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/log2.h>
@ -156,6 +157,47 @@ int cs_etm__get_cpu(u8 trace_chan_id, int *cpu)
return 0;
}
/*
* The returned PID format is presented by two bits:
*
* Bit ETM_OPT_CTXTID: CONTEXTIDR or CONTEXTIDR_EL1 is traced;
* Bit ETM_OPT_CTXTID2: CONTEXTIDR_EL2 is traced.
*
* It's possible that the two bits ETM_OPT_CTXTID and ETM_OPT_CTXTID2
* are enabled at the same time when the session runs on an EL2 kernel.
* This means the CONTEXTIDR_EL1 and CONTEXTIDR_EL2 both will be
* recorded in the trace data, the tool will selectively use
* CONTEXTIDR_EL2 as PID.
*/
int cs_etm__get_pid_fmt(u8 trace_chan_id, u64 *pid_fmt)
{
struct int_node *inode;
u64 *metadata, val;
inode = intlist__find(traceid_list, trace_chan_id);
if (!inode)
return -EINVAL;
metadata = inode->priv;
if (metadata[CS_ETM_MAGIC] == __perf_cs_etmv3_magic) {
val = metadata[CS_ETM_ETMCR];
/* CONTEXTIDR is traced */
if (val & BIT(ETM_OPT_CTXTID))
*pid_fmt = BIT(ETM_OPT_CTXTID);
} else {
val = metadata[CS_ETMV4_TRCCONFIGR];
/* CONTEXTIDR_EL2 is traced */
if (val & (BIT(ETM4_CFG_BIT_VMID) | BIT(ETM4_CFG_BIT_VMID_OPT)))
*pid_fmt = BIT(ETM_OPT_CTXTID2);
/* CONTEXTIDR_EL1 is traced */
else if (val & BIT(ETM4_CFG_BIT_CTXTID))
*pid_fmt = BIT(ETM_OPT_CTXTID);
}
return 0;
}
void cs_etm__etmq_set_traceid_queue_timestamp(struct cs_etm_queue *etmq,
u8 trace_chan_id)
{

1
tools/perf/util/cs-etm.h
View File

@ -193,6 +193,7 @@ struct cs_etm_packet_queue {
int cs_etm__process_auxtrace_info(union perf_event *event,
struct perf_session *session);
int cs_etm__get_cpu(u8 trace_chan_id, int *cpu);
int cs_etm__get_pid_fmt(u8 trace_chan_id, u64 *pid_fmt);
int cs_etm__etmq_set_tid(struct cs_etm_queue *etmq,
pid_t tid, u8 trace_chan_id);
bool cs_etm__etmq_is_timeless(struct cs_etm_queue *etmq);