1// Copyright (C) 2024 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15import { 16 NUM, 17 Plugin, 18 PluginContextTrace, 19 PluginDescriptor, 20 STR_NULL, 21} from '../../public'; 22import {AsyncSliceTrack} from '../../core_plugins/async_slices/async_slice_track'; 23import {ASYNC_SLICE_TRACK_KIND} from '../../public'; 24 25// This plugin renders visualizations of runtime power state transitions for 26// Linux kernel devices (devices managed by Linux drivers). 27class LinuxKernelDevices implements Plugin { 28 async onTraceLoad(ctx: PluginContextTrace): Promise<void> { 29 const result = await ctx.engine.query(` 30 select 31 t.id as trackId, 32 t.name 33 from linux_device_track t 34 join _slice_track_summary using (id) 35 order by t.name; 36 `); 37 38 const it = result.iter({ 39 name: STR_NULL, 40 trackId: NUM, 41 }); 42 43 for (; it.valid(); it.next()) { 44 const trackId = it.trackId; 45 const displayName = it.name ?? `${trackId}`; 46 47 ctx.registerStaticTrack({ 48 uri: `org.kernel.LinuxKernelDevices#${displayName}`, 49 displayName, 50 trackIds: [trackId], 51 kind: ASYNC_SLICE_TRACK_KIND, 52 trackFactory: ({trackKey}) => { 53 return new AsyncSliceTrack( 54 { 55 engine: ctx.engine, 56 trackKey, 57 }, 58 0, 59 [trackId], 60 ); 61 }, 62 groupName: `Linux Kernel Devices`, 63 }); 64 } 65 } 66} 67 68export const plugin: PluginDescriptor = { 69 pluginId: 'org.kernel.LinuxKernelDevices', 70 plugin: LinuxKernelDevices, 71}; 72