linux-kernel - [PATCH v3 12/20] perf arm-spe: Refactor counter packet handling

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Message-Id: <20201022145816.14069-13-leo.yan@linaro.org>
Date:   Thu, 22 Oct 2020 15:58:08 +0100
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Wei Li <liwei391@...wei.com>,
        James Clark <james.clark@....com>,
        Andre Przywara <andre.przywara@....com>,
        Al Grant <Al.Grant@....com>, Dave Martin <Dave.Martin@....com>,
        linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v3 12/20] perf arm-spe: Refactor counter packet handling

This patch defines macros for counter packet header, and uses macros to
replace hard code values in functions arm_spe_get_counter() and
arm_spe_pkt_desc().

In the function arm_spe_get_counter(), adds a new line for more
readable.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 11 ++++++-----
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h |  8 ++++++++
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
index 023bcc9be3cc..6eebd30f3d78 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
@@ -152,10 +152,11 @@ static int arm_spe_get_counter(const unsigned char *buf, size_t len,
 			       const unsigned char ext_hdr, struct arm_spe_pkt *packet)
 {
 	packet->type = ARM_SPE_COUNTER;
+
 	if (ext_hdr)
-		packet->index = ((buf[0] & 0x3) << 3) | (buf[1] & 0x7);
+		packet->index = SPE_CNT_PKT_HDR_EXTENDED_INDEX(buf[0], buf[1]);
 	else
-		packet->index = buf[0] & 0x7;
+		packet->index = SPE_CNT_PKT_HDR_SHORT_INDEX(buf[0]);
 
 	return arm_spe_get_payload(buf, len, ext_hdr, packet);
 }
@@ -307,17 +308,17 @@ static int arm_spe_pkt_desc_counter(const struct arm_spe_pkt *packet,
 		return ret;
 
 	switch (packet->index) {
-	case 0:
+	case SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT:
 		ret = arm_spe_pkt_snprintf(&buf, &blen, "TOT");
 		if (ret < 0)
 			return ret;
 		break;
-	case 1:
+	case SPE_CNT_PKT_HDR_INDEX_ISSUE_LAT:
 		ret = arm_spe_pkt_snprintf(&buf, &blen, "ISSUE");
 		if (ret < 0)
 			return ret;
 		break;
-	case 2:
+	case SPE_CNT_PKT_HDR_INDEX_TRANS_LAT:
 		ret = arm_spe_pkt_snprintf(&buf, &blen, "XLAT");
 		if (ret < 0)
 			return ret;
diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
index 8808f2d0b6e4..8a291f451ef8 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
@@ -84,6 +84,14 @@ struct arm_spe_pkt {
 /* Context packet header */
 #define SPE_CTX_PKT_HDR_INDEX(h)		((h) & GENMASK_ULL(1, 0))
 
+/* Counter packet header */
+#define SPE_CNT_PKT_HDR_SHORT_INDEX(h)		((h) & GENMASK_ULL(2, 0))
+#define SPE_CNT_PKT_HDR_EXTENDED_INDEX(h0, h1)	(((h0) & GENMASK_ULL(1, 0)) << 3 | \
+						 SPE_ADDR_PKT_HDR_SHORT_INDEX(h1))
+#define SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT		0x0
+#define SPE_CNT_PKT_HDR_INDEX_ISSUE_LAT		0x1
+#define SPE_CNT_PKT_HDR_INDEX_TRANS_LAT		0x2
+
 const char *arm_spe_pkt_name(enum arm_spe_pkt_type);
 
 int arm_spe_get_packet(const unsigned char *buf, size_t len,
-- 
2.17.1