Commit 47f0d94c authored by Leo Yan's avatar Leo Yan Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarLeo Yan <leo.yan@linaro.org>
Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: default avatarSuzuki 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 30cb76aa

tools/perf/util/cs-etm.c

+42 −0
Original line number Diff line number Diff line
@@ -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)

{

tools/perf/util/cs-etm.h

+1 −0
Original line number Diff line number Diff line
@@ -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);