| /* |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include <unordered_map> |
| #include <vector> |
| |
| namespace android { |
| namespace dmabufinfo { |
| |
| /* |
| * struct DmabufInfo: Represents information about a DMA-BUF. |
| * |
| * @inode: The unique inode number for the buffer. |
| * @exp_name: Name of the exporter of the buffer. |
| * @size: Size of the buffer. |
| */ |
| struct DmabufInfo { |
| unsigned long inode; |
| std::string exp_name; |
| uint64_t size; |
| }; |
| |
| struct DmabufTotal { |
| uint64_t size; |
| unsigned int buffer_count; |
| }; |
| |
| class DmabufSysfsStats { |
| public: |
| inline const std::vector<DmabufInfo>& buffer_stats() const { return buffer_stats_; } |
| inline const std::unordered_map<std::string, struct DmabufTotal>& exporter_info() const { |
| return exporter_info_; |
| } |
| inline uint64_t total_size() const { return total_.size; } |
| inline unsigned int total_count() const { return total_.buffer_count; } |
| |
| friend bool GetDmabufSysfsStats(DmabufSysfsStats* stats, const std::string& path); |
| |
| private: |
| std::vector<DmabufInfo> buffer_stats_; |
| std::unordered_map<std::string, struct DmabufTotal> exporter_info_; |
| struct DmabufTotal total_; |
| }; |
| |
| /* |
| * Reads and parses DMA-BUF statistics from sysfs to create per-buffer |
| * and per-exporter stats. |
| * |
| * @stats: output argument that will be populated with information from DMA-BUF sysfs stats. |
| * @path: Not for use by clients, to be used only for unit testing. |
| * |
| * Returns true on success. |
| */ |
| bool GetDmabufSysfsStats(DmabufSysfsStats* stats, |
| const std::string& path = "/sys/kernel/dmabuf/buffers"); |
| |
| /* |
| * Calculates the total size of all DMA-BUFs exported. It does not read or parse |
| * the rest of the DMA-BUF sysfs statistics inorder to be performant. |
| * |
| * @path: Not for use by clients, to be used only for unit testing. |
| * |
| * Returns total size of all DMA-BUFs exported in units of KB. |
| */ |
| bool GetDmabufTotalExportedKb(uint64_t* total_exported, |
| const std::string& path = "/sys/kernel/dmabuf/buffers"); |
| |
| /* Reads the exporter name of the DMA buffer with @inode */ |
| bool ReadBufferExporter(unsigned int inode, std::string* exporter, |
| const std::string& dmabuf_sysfs_path = "/sys/kernel/dmabuf/buffers"); |
| |
| /* Reads the size of the DMA buffer with @inode */ |
| bool ReadBufferSize(unsigned int inode, uint64_t* size, |
| const std::string& dmabuf_sysfs_path = "/sys/kernel/dmabuf/buffers"); |
| |
| } // namespace dmabufinfo |
| } // namespace android |