linux-kernel - [PATCH v2 12/14] perf arm-spe: Add more sub classes for operation packet

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Date:   Tue, 29 Sep 2020 14:39:15 +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>,
        Dave Martin <Dave.Martin@....com>,
        linux-kernel@...r.kernel.org, Al Grant <Al.Grant@....com>
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v2 12/14] perf arm-spe: Add more sub classes for operation packet

For the operation type packet payload with load/store class, it misses
to support these sub classes:

  - A load/store targeting the general-purpose registers;
  - A load/store targeting unspecified registers;
  - 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 load/store sub classes, so that the perf
tool can decode it properly.

Inspired by Andre Przywara, refined the commit log and code for more
clear description.

Co-developed-by: Andre Przywara <andre.przywara@....com>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 .../util/arm-spe-decoder/arm-spe-pkt-decoder.c    | 15 +++++++++++++++
 1 file changed, 15 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 a848c784f4cf..57a2d5494838 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
@@ -378,6 +378,21 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
 				ret = arm_spe_pkt_snprintf(&buf, &blen, " SIMD-FP");
 				if (ret < 0)
 					return ret;
+			} else if ((payload & SPE_OP_PKT_LDST_SUBCLASS_MASK) ==
+					SPE_OP_PKT_LDST_SUBCLASS_GP_REG) {
+				ret = arm_spe_pkt_snprintf(&buf, &blen, " GP-REG");
+				if (ret < 0)
+					return ret;
+			} else if ((payload & SPE_OP_PKT_LDST_SUBCLASS_MASK) ==
+					SPE_OP_PKT_LDST_SUBCLASS_UNSPEC_REG) {
+				ret = arm_spe_pkt_snprintf(&buf, &blen, " UNSPEC-REG");
+				if (ret < 0)
+					return ret;
+			} else if ((payload & SPE_OP_PKT_LDST_SUBCLASS_MASK) ==
+					SPE_OP_PKT_LDST_SUBCLASS_NV_SYSREG) {
+				ret = arm_spe_pkt_snprintf(&buf, &blen, " NV-SYSREG");
+				if (ret < 0)
+					return ret;
 			}
 
 			return buf_len - blen;
-- 
2.20.1