COMPMID-482: Refactor PMU counters

Change-Id: I9b254ce693363ecbbd7c188d211c85471134a91e
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/84328
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/tests/framework/instruments/PMU.cpp b/tests/framework/instruments/PMU.cpp
new file mode 100644
index 0000000000..0594e96cb2
--- /dev/null
+++ b/tests/framework/instruments/PMU.cpp
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "PMU.h"
+
+#include <asm/unistd.h>
+#include <cstring>
+#include <stdexcept>
+#include <sys/ioctl.h>
+
+namespace arm_compute
+{
+namespace test
+{
+namespace framework
+{
+PMU::PMU()
+    : _perf_config()
+{
+    _perf_config.type = PERF_TYPE_HARDWARE;
+    _perf_config.size = sizeof(perf_event_attr);
+
+    // Start disabled
+    _perf_config.disabled = 1;
+    // The inherit bit specifies that this counter should count events of child
+    // tasks as well as the task specified
+    _perf_config.inherit = 1;
+    // Enables saving of event counts on context switch for inherited tasks
+    _perf_config.inherit_stat = 1;
+}
+
+PMU::PMU(uint64_t config)
+    : PMU()
+{
+    open(config);
+}
+
+PMU::~PMU()
+{
+    close();
+}
+
+void PMU::open(uint64_t config)
+{
+    _perf_config.config = config;
+    open(_perf_config);
+}
+
+void PMU::open(const perf_event_attr &perf_config)
+{
+    // Measure this process/thread (+ children) on any CPU
+    _fd = syscall(__NR_perf_event_open, &perf_config, 0, -1, -1, 0);
+
+    ARM_COMPUTE_ERROR_ON_MSG(_fd < 0, "perf_event_open failed");
+
+    const int result = ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0);
+
+    ARM_COMPUTE_ERROR_ON_MSG(result == -1, "Failed to enable PMU counter: %d", errno);
+    ARM_COMPUTE_UNUSED(result);
+}
+
+void PMU::close()
+{
+    if(_fd != -1)
+    {
+        ::close(_fd);
+        _fd = -1;
+    }
+}
+
+void PMU::reset()
+{
+    const int result = ioctl(_fd, PERF_EVENT_IOC_RESET, 0);
+    ARM_COMPUTE_ERROR_ON_MSG(result == -1, "Failed to reset PMU counter: %d", errno);
+    ARM_COMPUTE_UNUSED(result);
+}
+} // namespace framework
+} // namespace test
+} // namespace arm_compute