linux-kernel - [RFC PATCH 4/4] perf test arm64: Add attr tests for new VG register

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Message-Id: <20220927154104.869029-5-james.clark@arm.com>
Date:   Tue, 27 Sep 2022 16:41:04 +0100
From:   James Clark <james.clark@....com>
To:     acme@...nel.org, namhyung@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        will@...nel.org, James Clark <james.clark@....com>,
        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@...nel.org>, bpf@...r.kernel.org
Subject: [RFC PATCH 4/4] perf test arm64: Add attr tests for new VG register

Ensure that the availability of the VG register behaves as expected
depending on the kernel version and SVE support.

Signed-off-by: James Clark <james.clark@....com>
---
 .../attr/test-record-user-regs-no-sve-aarch64      |  9 +++++++++
 .../attr/test-record-user-regs-old-sve-aarch64     | 10 ++++++++++
 .../tests/attr/test-record-user-regs-sve-aarch64   | 14 ++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64
 create mode 100644 tools/perf/tests/attr/test-record-user-regs-old-sve-aarch64
 create mode 100644 tools/perf/tests/attr/test-record-user-regs-sve-aarch64

diff --git a/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 b/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64
new file mode 100644
index 000000000000..fbb065842880
--- /dev/null
+++ b/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64
@@ -0,0 +1,9 @@
+# Test that asking for VG fails if the system doesn't support SVE. This
+# applies both before and after the feature was added in 6.1
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 129
+test_ret = true
+arch    = aarch64
+auxv    = auxv["AT_HWCAP"] & 0x200000 == 0
diff --git a/tools/perf/tests/attr/test-record-user-regs-old-sve-aarch64 b/tools/perf/tests/attr/test-record-user-regs-old-sve-aarch64
new file mode 100644
index 000000000000..15ebfc3418e3
--- /dev/null
+++ b/tools/perf/tests/attr/test-record-user-regs-old-sve-aarch64
@@ -0,0 +1,10 @@
+# Test that asking for VG always fails on old kernels because it was
+# added in 6.1. This applies to systems that either support or don't
+# support SVE.
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 129
+test_ret = true
+arch    = aarch64
+kernel_until = 6.1
diff --git a/tools/perf/tests/attr/test-record-user-regs-sve-aarch64 b/tools/perf/tests/attr/test-record-user-regs-sve-aarch64
new file mode 100644
index 000000000000..c598c803221d
--- /dev/null
+++ b/tools/perf/tests/attr/test-record-user-regs-sve-aarch64
@@ -0,0 +1,14 @@
+# Test that asking for VG works if the system has SVE and after the
+# feature was added in 6.1
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 1
+test_ret = true
+arch    = aarch64
+auxv    = auxv["AT_HWCAP"] & 0x200000 == 0x200000
+kernel_since = 6.1
+
+[event:base-record]
+sample_type=4359
+sample_regs_user=70368744177664
-- 
2.28.0