1 files changed, 79 insertions, 0 deletions
diff --git a/profcollectd/libprofcollectd/simpleperf_etm_trace_provider.rs b/profcollectd/libprofcollectd/simpleperf_etm_trace_provider.rs
new file mode 100644
index 00000000..2038a5be
--- /dev/null
+++ b/profcollectd/libprofcollectd/simpleperf_etm_trace_provider.rs
@@ -0,0 +1,79 @@
+//
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+//! Trace provider backed by ARM Coresight ETM, using simpleperf tool.
+
+use anyhow::{anyhow, Result};
+use std::fs::{read_dir, remove_file};
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+use trace_provider::TraceProvider;
+
+use crate::trace_provider;
+
+static ETM_TRACEFILE_EXTENSION: &str = "etmtrace";
+static ETM_PROFILE_EXTENSION: &str = "data";
+
+pub struct SimpleperfEtmTraceProvider {}
+
+impl TraceProvider for SimpleperfEtmTraceProvider {
+    fn get_name(&self) -> &'static str {
+        "simpleperf_etm"
+    }
+
+    fn trace(&self, trace_dir: &Path, tag: &str, sampling_period: &Duration) {
+        let mut trace_file = PathBuf::from(trace_dir);
+        trace_file.push(trace_provider::construct_file_name(tag));
+        trace_file.set_extension(ETM_TRACEFILE_EXTENSION);
+
+        simpleperf_profcollect::record(
+            &trace_file,
+            sampling_period,
+            simpleperf_profcollect::RecordScope::BOTH,
+        );
+    }
+
+    fn process(&self, trace_dir: &Path, profile_dir: &Path) -> Result<()> {
+        read_dir(trace_dir)?
+            .filter_map(|e| e.ok())
+            .map(|e| e.path())
+            .filter(|e| {
+                e.is_file()
+                    && e.extension()
+                        .and_then(|f| f.to_str())
+                        .filter(|ext| ext == &ETM_TRACEFILE_EXTENSION)
+                        .is_some()
+            })
+            .try_for_each(|trace_file| -> Result<()> {
+                let mut profile_file = PathBuf::from(profile_dir);
+                profile_file.push(
+                    trace_file
+                        .file_name()
+                        .ok_or_else(|| anyhow!("Malformed trace path: {}", trace_file.display()))?,
+                );
+                profile_file.set_extension(ETM_PROFILE_EXTENSION);
+                simpleperf_profcollect::process(&trace_file, &profile_file);
+                remove_file(&trace_file)?;
+                Ok(())
+            })
+    }
+}
+
+impl SimpleperfEtmTraceProvider {
+    pub fn supported() -> bool {
+        simpleperf_profcollect::has_support()
+    }
+}