linux-kernel - [PATCH 3/5] perf: arm_spe: Add nested virt event decoding

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Date:   Tue, 22 Sep 2020 11:12:23 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Tan Xiaojun <tanxiaojun@...wei.com>,
        James Clark <james.clark@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] perf: arm_spe: Add nested virt event decoding

The ARMv8.4 nested virtualisation extension can redirect system register
accesses to a memory page controlled by the hypervisor. The SPE
profiling feature in newer implementations can tag those memory accesses
accordingly.

Add the bit pattern describing this load/store type, so that the perf
tool can decode it properly.

Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 4 ++++
 1 file changed, 4 insertions(+)

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 e633bb5b8e65..943e4155b246 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
@@ -398,6 +398,10 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
 					buf += ret;
 					blen -= ret;
 				}
+			} else if ((payload & 0xfe) == 0x30) {
+				ret = snprintf(buf, buf_len, " NV-SYSREG");
+				buf += ret;
+				blen -= ret;
 			} else if (payload & 0x4) {
 				ret = snprintf(buf, buf_len, " SIMD-FP");
 				buf += ret;
-- 
2.17.1