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//
// 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.
//
//! This module implements safe wrappers for simpleperf etm operations required
//! by profcollect.
use std::ffi::CString;
use std::path::Path;
use std::time::Duration;
fn path_to_cstr(path: &Path) -> CString {
CString::new(path.to_str().unwrap()).unwrap()
}
/// Returns whether the system has etm driver. ETM driver should be available immediately
/// after boot.
pub fn has_driver_support() -> bool {
unsafe { simpleperf_profcollect_bindgen::HasDriverSupport() }
}
/// Returns whether the system has etm device. ETM device may not be available immediately
/// after boot.
pub fn has_device_support() -> bool {
unsafe { simpleperf_profcollect_bindgen::HasDeviceSupport() }
}
/// ETM recording scope
pub enum RecordScope {
/// Record etm data only for userspace.
USERSPACE,
/// Record etm data only for kernel.
KERNEL,
/// Record etm data for both userspace and kernel.
BOTH,
}
/// Trigger an ETM trace event.
pub fn record(trace_file: &Path, duration: &Duration, scope: RecordScope) {
let event_name: CString = match scope {
RecordScope::USERSPACE => CString::new("cs-etm:u").unwrap(),
RecordScope::KERNEL => CString::new("cs-etm:k").unwrap(),
RecordScope::BOTH => CString::new("cs-etm").unwrap(),
};
let trace_file = path_to_cstr(trace_file);
let duration = duration.as_secs_f32();
unsafe {
simpleperf_profcollect_bindgen::Record(event_name.as_ptr(), trace_file.as_ptr(), duration);
}
}
/// Translate ETM trace to profile.
pub fn process(trace_path: &Path, profile_path: &Path, binary_filter: &str) {
let trace_path = path_to_cstr(trace_path);
let profile_path = path_to_cstr(profile_path);
let binary_filter = CString::new(binary_filter).unwrap();
unsafe {
simpleperf_profcollect_bindgen::Inject(
trace_path.as_ptr(),
profile_path.as_ptr(),
binary_filter.as_ptr(),
);
}
}
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