89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <unordered_map>
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#include <vector>
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namespace android {
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namespace dmabufinfo {
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/*
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* struct DmabufInfo: Represents information about a DMA-BUF.
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*
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* @inode: The unique inode number for the buffer.
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* @exp_name: Name of the exporter of the buffer.
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* @size: Size of the buffer.
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*/
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struct DmabufInfo {
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unsigned int inode;
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std::string exp_name;
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unsigned int size;
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};
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struct DmabufTotal {
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uint64_t size;
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unsigned int buffer_count;
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};
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class DmabufSysfsStats {
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public:
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inline const std::vector<DmabufInfo>& buffer_stats() const { return buffer_stats_; }
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inline const std::unordered_map<std::string, struct DmabufTotal>& exporter_info() const {
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return exporter_info_;
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}
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inline uint64_t total_size() const { return total_.size; }
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inline unsigned int total_count() const { return total_.buffer_count; }
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friend bool GetDmabufSysfsStats(DmabufSysfsStats* stats, const std::string& path);
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private:
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std::vector<DmabufInfo> buffer_stats_;
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std::unordered_map<std::string, struct DmabufTotal> exporter_info_;
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struct DmabufTotal total_;
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};
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/*
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* Reads and parses DMA-BUF statistics from sysfs to create per-buffer
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* and per-exporter stats.
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*
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* @stats: output argument that will be populated with information from DMA-BUF sysfs stats.
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* @path: Not for use by clients, to be used only for unit testing.
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*
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* Returns true on success.
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*/
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bool GetDmabufSysfsStats(DmabufSysfsStats* stats,
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const std::string& path = "/sys/kernel/dmabuf/buffers");
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/*
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* Calculates the total size of all DMA-BUFs exported. It does not read or parse
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* the rest of the DMA-BUF sysfs statistics inorder to be performant.
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*
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* @path: Not for use by clients, to be used only for unit testing.
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*
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* Returns total size of all DMA-BUFs exported in units of KB.
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*/
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bool GetDmabufTotalExportedKb(uint64_t* total_exported,
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const std::string& path = "/sys/kernel/dmabuf/buffers");
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/* Reads the exporter name of the DMA buffer with @inode */
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bool ReadBufferExporter(unsigned int inode, std::string* exporter,
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const std::string& dmabuf_sysfs_path = "/sys/kernel/dmabuf/buffers");
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} // namespace dmabufinfo
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} // namespace android
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