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From: James Clark <james.clark@arm.com>
To: coresight@lists.linaro.org,
	suzuki.poulose@arm.com,
	gankulkarni@os.amperecomputing.com,
	mike.leach@linaro.org,
	leo.yan@linux.dev,
	anshuman.khandual@arm.com
Cc: James Clark <james.clark@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Jiri Olsa <jolsa@kernel.org>,
	Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	John Garry <john.g.garry@oracle.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-perf-users@vger.kernel.org
Subject: [PATCH v2 04/16] perf: cs-etm: Allocate queues for all CPUs
Date: Tue,  4 Jun 2024 15:30:13 +0100
Message-Id: <20240604143030.519906-5-james.clark@arm.com>
In-Reply-To: <20240604143030.519906-1-james.clark@arm.com>
References: <20240604143030.519906-1-james.clark@arm.com>
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Make cs_etm__setup_queue() setup a queue even if it's empty, and
pre-allocate queues based on the max CPU that was recorded. In per-CPU
mode aux queues are indexed based on CPU ID even if all CPUs aren't
recorded, sparse queue arrays aren't used.

This will allow HW_IDs to be saved even if no aux data was received in
that queue without having to call cs_etm__setup_queue() from two
different places.

Signed-off-by: James Clark <james.clark@arm.com>
---
 tools/perf/util/cs-etm.c | 55 ++++++++++++++++++++--------------------
 1 file changed, 27 insertions(+), 28 deletions(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index f09004c4ba44..e40dfd09d3ed 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -104,6 +104,7 @@ struct cs_etm_queue {
 	unsigned int queue_nr;
 	u8 pending_timestamp_chan_id;
 	bool formatted;
+	bool formatted_set;
 	u64 offset;
 	const unsigned char *buf;
 	size_t buf_len, buf_used;
@@ -1056,16 +1057,11 @@ static struct cs_etm_queue *cs_etm__alloc_queue(void)
 
 static int cs_etm__setup_queue(struct cs_etm_auxtrace *etm,
 			       struct auxtrace_queue *queue,
-			       unsigned int queue_nr, bool formatted)
+			       unsigned int queue_nr)
 {
 	struct cs_etm_queue *etmq = queue->priv;
 
-	if (etmq && formatted != etmq->formatted) {
-		pr_err("CS_ETM: mixed formatted and unformatted trace not supported\n");
-		return -EINVAL;
-	}
-
-	if (list_empty(&queue->head) || etmq)
+	if (etmq)
 		return 0;
 
 	etmq = cs_etm__alloc_queue();
@@ -1078,7 +1074,6 @@ static int cs_etm__setup_queue(struct cs_etm_auxtrace *etm,
 	etmq->queue_nr = queue_nr;
 	queue->cpu = queue_nr; /* Placeholder, may be reset to -1 in per-thread mode */
 	etmq->offset = 0;
-	etmq->formatted = formatted;
 
 	return 0;
 }
@@ -2791,17 +2786,6 @@ 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, true);
-		if (err)
-			return err;
-
 		if (dump_trace)
 			if (auxtrace_buffer__get_data(buffer, fd)) {
 				cs_etm__dump_event(etm->queues.queue_array[idx].priv, buffer);
@@ -2918,7 +2902,6 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o
 	struct perf_record_auxtrace *auxtrace_event;
 	union perf_event auxtrace_fragment;
 	__u64 aux_offset, aux_size;
-	__u32 idx;
 	bool formatted;
 
 	struct cs_etm_auxtrace *etm = container_of(session->auxtrace,
@@ -2985,6 +2968,8 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o
 
 	if (aux_offset >= auxtrace_event->offset &&
 	    aux_offset + aux_size <= auxtrace_event->offset + auxtrace_event->size) {
+		struct cs_etm_queue *etmq = etm->queues.queue_array[auxtrace_event->idx].priv;
+
 		/*
 		 * If this AUX event was inside this buffer somewhere, create a new auxtrace event
 		 * based on the sizes of the aux event, and queue that fragment.
@@ -3001,10 +2986,14 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o
 		if (err)
 			return err;
 
-		idx = auxtrace_event->idx;
 		formatted = !(aux_event->flags & PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW);
-
-		return cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], idx, formatted);
+		if (etmq->formatted_set && formatted != etmq->formatted) {
+			pr_err("CS_ETM: mixed formatted and unformatted trace not supported\n");
+			return -EINVAL;
+		}
+		etmq->formatted = formatted;
+		etmq->formatted_set = true;
+		return 0;
 	}
 
 	/* Wasn't inside this buffer, but there were no parse errors. 1 == 'not found' */
@@ -3256,6 +3245,7 @@ static int cs_etm__create_decoders(struct cs_etm_auxtrace *etm)
 		 * Don't create decoders for empty queues, mainly because
 		 * etmq->formatted is unknown for empty queues.
 		 */
+		assert(empty == !etmq->formatted_set);
 		if (empty)
 			continue;
 
@@ -3275,10 +3265,10 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
 	int event_header_size = sizeof(struct perf_event_header);
 	int total_size = auxtrace_info->header.size;
 	int priv_size = 0;
-	int num_cpu;
+	int num_cpu, max_cpu = 0;
 	int err = 0;
 	int aux_hw_id_found;
-	int i, j;
+	int i;
 	u64 *ptr = NULL;
 	u64 **metadata = NULL;
 
@@ -3309,7 +3299,7 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
 	 * required by the trace decoder to properly decode the trace due
 	 * to its highly compressed nature.
 	 */
-	for (j = 0; j < num_cpu; j++) {
+	for (int j = 0; j < num_cpu; j++) {
 		if (ptr[i] == __perf_cs_etmv3_magic) {
 			metadata[j] =
 				cs_etm__create_meta_blk(ptr, &i,
@@ -3333,6 +3323,9 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
 			err = -ENOMEM;
 			goto err_free_metadata;
 		}
+
+		if ((int) metadata[j][CS_ETM_CPU] > max_cpu)
+			max_cpu = metadata[j][CS_ETM_CPU];
 	}
 
 	/*
@@ -3362,10 +3355,16 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
 	 */
 	etm->pid_fmt = cs_etm__init_pid_fmt(metadata[0]);
 
-	err = auxtrace_queues__init(&etm->queues);
+	err = auxtrace_queues__init_nr(&etm->queues, max_cpu + 1);
 	if (err)
 		goto err_free_etm;
 
+	for (unsigned int j = 0; j < etm->queues.nr_queues; ++j) {
+		err = cs_etm__setup_queue(etm, &etm->queues.queue_array[j], j);
+		if (err)
+			goto err_free_queues;
+	}
+
 	if (session->itrace_synth_opts->set) {
 		etm->synth_opts = *session->itrace_synth_opts;
 	} else {
@@ -3487,7 +3486,7 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
 	zfree(&etm);
 err_free_metadata:
 	/* No need to check @metadata[j], free(NULL) is supported */
-	for (j = 0; j < num_cpu; j++)
+	for (int j = 0; j < num_cpu; j++)
 		zfree(&metadata[j]);
 	zfree(&metadata);
 err_free_traceid_list:
-- 
2.34.1