1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.internal.os;
18 
19 import android.annotation.Nullable;
20 
21 /** Wrapper around libdmabufinfo. */
22 public final class DmabufInfoReader {
DmabufInfoReader()23     private DmabufInfoReader() {}
24 
25     /** Process dma-buf stats. */
26     public static final class ProcessDmabuf {
27         /** Size of buffers retained by the process. */
28         public final int retainedSizeKb;
29         /** Number of buffers retained by the process. */
30         public final int retainedBuffersCount;
31         /** Size of buffers mapped to the address space. */
32         public final int mappedSizeKb;
33         /** Count of buffers mapped to the address space. */
34         public final int mappedBuffersCount;
35 
ProcessDmabuf(int retainedSizeKb, int retainedBuffersCount, int mappedSizeKb, int mappedBuffersCount)36         ProcessDmabuf(int retainedSizeKb, int retainedBuffersCount,
37                 int mappedSizeKb, int mappedBuffersCount) {
38             this.retainedSizeKb = retainedSizeKb;
39             this.retainedBuffersCount = retainedBuffersCount;
40             this.mappedSizeKb = mappedSizeKb;
41             this.mappedBuffersCount = mappedBuffersCount;
42         }
43     }
44 
45     /**
46      * Return stats for DMA-BUFs retained by process pid or null if the DMA-BUF
47      * stats could not be read.
48      */
49     @Nullable
getProcessStats(int pid)50     public static native ProcessDmabuf getProcessStats(int pid);
51 }
52