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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <vector>
namespace android {
namespace dmabufinfo {
struct DmaBuffer {
public:
DmaBuffer(ino_t inode, uint64_t size, uint64_t count, const std::string& exporter,
const std::string& name)
: inode_(inode), size_(size), count_(count), exporter_(exporter), name_(name) {}
~DmaBuffer() = default;
// Adds one file descriptor reference for the given pid
void AddFdRef(pid_t pid) { fdrefs_.emplace_back(pid); }
// Adds one map reference for the given pid
void AddMapRef(pid_t pid) { maprefs_.emplace_back(pid); }
// Getters for each property
uint64_t size() { return size_; }
const std::vector<pid_t>& fdrefs() const { return fdrefs_; }
const std::vector<pid_t>& maprefs() const { return maprefs_; }
ino_t inode() const { return inode_; }
uint64_t total_refs() const { return fdrefs_.size() + maprefs_.size(); }
uint64_t count() const { return count_; };
const std::string& name() const { return name_; }
const std::string& exporter() const { return exporter_; }
private:
ino_t inode_;
uint64_t size_;
uint64_t count_;
std::string exporter_;
std::string name_;
std::vector<pid_t> fdrefs_;
std::vector<pid_t> maprefs_;
};
// Read and return current dma buf objects from
// DEBUGFS/dma_buf/bufinfo. The references to each dma buffer are not
// populated here and will return an empty vector.
// Returns false if something went wrong with the function, true otherwise.
bool ReadDmaBufInfo(std::vector<DmaBuffer>* dmabufs,
const std::string& path = "/sys/kernel/debug/dma_buf/bufinfo");
// Read and return dmabuf objects for a given process without the help
// of DEBUGFS
bool ReadDmaBufInfo(pid_t pid, std::vector<DmaBuffer>* dmabufs);
} // namespace dmabufinfo
} // namespace android
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