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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>
#include <unordered_map>
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) {
AddRefToPidMap(pid, &fdrefs_);
}
// Adds one map reference for the given pid
void AddMapRef(pid_t pid) {
AddRefToPidMap(pid, &maprefs_);
}
// Getters for each property
uint64_t size() { return size_; }
const std::unordered_map<pid_t, int>& fdrefs() const { return fdrefs_; }
const std::unordered_map<pid_t, int>& 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_; }
void SetName(const std::string& name) { name_ = name; }
void SetExporter(const std::string& exporter) { exporter_ = exporter; }
void SetCount(uint64_t count) { count_ = count; }
private:
ino_t inode_;
uint64_t size_;
uint64_t count_;
std::string exporter_;
std::string name_;
std::unordered_map<pid_t, int> fdrefs_;
std::unordered_map<pid_t, int> maprefs_;
void AddRefToPidMap(pid_t pid, std::unordered_map<pid_t, int>* map) {
// The first time we find a ref, we set the ref count to 1
// otherwise, increment the existing ref count
auto [it, inserted] = map->insert(std::make_pair(pid, 1));
if (!inserted)
it->second++;
}
};
// 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
//
// Returns false if something went wrong with the function, true otherwise.
bool ReadDmaBufInfo(pid_t pid, std::vector<DmaBuffer>* dmabufs);
// Append dmabuf objects for a given process without the help
// of DEBUGFS to an existing vector
//
// Returns false if something went wrong with the function, true otherwise.
bool AppendDmaBufInfo(pid_t pid, std::vector<DmaBuffer>* dmabufs);
} // namespace dmabufinfo
} // namespace android
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