Merge "Remove WM lock from the path of service operations" into sc-dev (725dae5c) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/wm/ActivityTaskManagerService.java

+4 −2

Original line number	Diff line number	Diff line
		@@ -486,13 +486,13 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
		* Whether normal application switches are allowed; a call to {@link #stopAppSwitches()
		* disables this.
		*/
		private boolean mAppSwitchesAllowed = true;
		private volatile boolean mAppSwitchesAllowed = true;

		/**
		* Last stop app switches time, apps finished before this time cannot start background activity
		* even if they are in grace period.
		*/
		private long mLastStopAppSwitchesTime;
		private volatile long mLastStopAppSwitchesTime;

		IActivityController mController = null;
		boolean mControllerIsAMonkey = false;
		@@ -698,6 +698,7 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
		int OOM_ADJUSTMENT = 1;
		int LRU_UPDATE = 2;
		int PROCESS_CHANGE = 3;
		int START_SERVICE = 4;

		int caller() default NONE;
		}
		@@ -4744,6 +4745,7 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
		}

		/** A uid is considered to be foreground if it has a visible non-toast window. */
		@HotPath(caller = HotPath.START_SERVICE)
		boolean hasActiveVisibleWindow(int uid) {
		if (mVisibleActivityProcessTracker.hasVisibleActivity(uid)) {
		return true;

services/core/java/com/android/server/wm/BackgroundActivityStartCallback.java

+4 −2

Original line number	Diff line number	Diff line
		@@ -31,7 +31,8 @@ public interface BackgroundActivityStartCallback {
		* Note that if the start was allowed due to a mechanism other than tokens (eg. permission),
		* this won't be called.
		*
		* This will be called holding the WM lock, don't do anything costly here.
		* This will be called holding the WM and local lock, don't do anything costly or invoke AM/WM
		* methods here directly.
		*/
		boolean isActivityStartAllowed(Collection<IBinder> tokens, int uid, String packageName);

		@@ -40,7 +41,8 @@ public interface BackgroundActivityStartCallback {
		* #ACTION_CLOSE_SYSTEM_DIALOGS}, presumably to start activities, based on the originating
		* tokens {@code tokens} currently associated with potential activity starts.
		*
		* This will be called holding the AM and WM lock, don't do anything costly here.
		* This will be called holding the AM and local lock, don't do anything costly or invoke AM/WM
		* methods here directly.
		*/
		boolean canCloseSystemDialogs(Collection<IBinder> tokens, int uid);
		}

services/core/java/com/android/server/wm/BackgroundLaunchProcessController.java

0 → 100644

+264 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		*/

		package com.android.server.wm;

		import static com.android.server.wm.ActivityTaskManagerDebugConfig.DEBUG_ACTIVITY_STARTS;
		import static com.android.server.wm.ActivityTaskManagerDebugConfig.TAG_ATM;
		import static com.android.server.wm.ActivityTaskManagerDebugConfig.TAG_WITH_CLASS_NAME;
		import static com.android.server.wm.ActivityTaskManagerService.ACTIVITY_BG_START_GRACE_PERIOD_MS;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.os.Binder;
		import android.os.IBinder;
		import android.os.SystemClock;
		import android.util.ArrayMap;
		import android.util.ArraySet;
		import android.util.IntArray;
		import android.util.Slog;

		import com.android.internal.annotations.GuardedBy;

		import java.io.PrintWriter;
		import java.util.Arrays;
		import java.util.function.IntPredicate;

		/**
		* A per-process controller to decide whether the process can start activity or foreground service
		* (especially from background). All methods of this class must be thread safe. The caller does not
		* need to hold WM lock, e.g. lock contention of WM lock shouldn't happen when starting service.
		*/
		class BackgroundLaunchProcessController {
		private static final String TAG =
		TAG_WITH_CLASS_NAME ? "BackgroundLaunchProcessController" : TAG_ATM;

		/** It is {@link ActivityTaskManagerService#hasActiveVisibleWindow(int)}. */
		private final IntPredicate mUidHasActiveVisibleWindowPredicate;

		private final @Nullable BackgroundActivityStartCallback mBackgroundActivityStartCallback;

		/**
		* A set of tokens that currently contribute to this process being temporarily allowed
		* to start activities even if it's not in the foreground. The values of this map are optional
		* (can be null) and are used to trace back the grant to the notification token mechanism.
		*/
		@GuardedBy("this")
		private @Nullable ArrayMap<Binder, IBinder> mBackgroundActivityStartTokens;

		/** Set of UIDs of clients currently bound to this process. */
		@GuardedBy("this")
		private @Nullable IntArray mBoundClientUids;

		BackgroundLaunchProcessController(@NonNull IntPredicate uidHasActiveVisibleWindowPredicate,
		@Nullable BackgroundActivityStartCallback callback) {
		mUidHasActiveVisibleWindowPredicate = uidHasActiveVisibleWindowPredicate;
		mBackgroundActivityStartCallback = callback;
		}

		boolean areBackgroundActivityStartsAllowed(int pid, int uid, String packageName,
		boolean appSwitchAllowed, boolean isCheckingForFgsStart, boolean hasVisibleActivities,
		boolean hasBackgroundActivityStartPrivileges, long lastStopAppSwitchesTime,
		long lastActivityLaunchTime, long lastActivityFinishTime) {
		// If app switching is not allowed, we ignore all the start activity grace period
		// exception so apps cannot start itself in onPause() after pressing home button.
		if (appSwitchAllowed) {
		// Allow if any activity in the caller has either started or finished very recently, and
		// it must be started or finished after last stop app switches time.
		final long now = SystemClock.uptimeMillis();
		if (now - lastActivityLaunchTime < ACTIVITY_BG_START_GRACE_PERIOD_MS
		\|\| now - lastActivityFinishTime < ACTIVITY_BG_START_GRACE_PERIOD_MS) {
		// If activity is started and finished before stop app switch time, we should not
		// let app to be able to start background activity even it's in grace period.
		if (lastActivityLaunchTime > lastStopAppSwitchesTime
		\|\| lastActivityFinishTime > lastStopAppSwitchesTime) {
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid
		+ ")] Activity start allowed: within "
		+ ACTIVITY_BG_START_GRACE_PERIOD_MS + "ms grace period");
		}
		return true;
		}
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid + ")] Activity start within "
		+ ACTIVITY_BG_START_GRACE_PERIOD_MS
		+ "ms grace period but also within stop app switch window");
		}

		}
		}
		// Allow if the proc is instrumenting with background activity starts privs.
		if (hasBackgroundActivityStartPrivileges) {
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid
		+ ")] Activity start allowed: process instrumenting with background "
		+ "activity starts privileges");
		}
		return true;
		}
		// Allow if the caller has an activity in any foreground task.
		if (appSwitchAllowed && hasVisibleActivities) {
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid
		+ ")] Activity start allowed: process has activity in foreground task");
		}
		return true;
		}
		// Allow if the caller is bound by a UID that's currently foreground.
		if (isBoundByForegroundUid()) {
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid
		+ ")] Activity start allowed: process bound by foreground uid");
		}
		return true;
		}
		// Allow if the flag was explicitly set.
		if (isBackgroundStartAllowedByToken(uid, packageName, isCheckingForFgsStart)) {
		if (DEBUG_ACTIVITY_STARTS) {
		Slog.d(TAG, "[Process(" + pid
		+ ")] Activity start allowed: process allowed by token");
		}
		return true;
		}
		return false;
		}

		/**
		* If there are no tokens, we don't allow by token. If there are tokens and
		* isCheckingForFgsStart is false, we ask the callback if the start is allowed for these tokens,
		* otherwise if there is no callback we allow.
		*/
		private boolean isBackgroundStartAllowedByToken(int uid, String packageName,
		boolean isCheckingForFgsStart) {
		synchronized (this) {
		if (mBackgroundActivityStartTokens == null
		\|\| mBackgroundActivityStartTokens.isEmpty()) {
		return false;
		}
		if (isCheckingForFgsStart) {
		// BG-FGS-start only checks if there is a token.
		return true;
		}

		if (mBackgroundActivityStartCallback == null) {
		// We have tokens but no callback to decide => allow.
		return true;
		}
		// The callback will decide.
		return mBackgroundActivityStartCallback.isActivityStartAllowed(
		mBackgroundActivityStartTokens.values(), uid, packageName);
		}
		}

		private boolean isBoundByForegroundUid() {
		synchronized (this) {
		if (mBoundClientUids != null) {
		for (int i = mBoundClientUids.size() - 1; i >= 0; i--) {
		if (mUidHasActiveVisibleWindowPredicate.test(mBoundClientUids.get(i))) {
		return true;
		}
		}
		}
		}
		return false;
		}

		void setBoundClientUids(ArraySet<Integer> boundClientUids) {
		synchronized (this) {
		if (boundClientUids == null \|\| boundClientUids.isEmpty()) {
		mBoundClientUids = null;
		return;
		}
		if (mBoundClientUids == null) {
		mBoundClientUids = new IntArray();
		} else {
		mBoundClientUids.clear();
		}
		for (int i = boundClientUids.size() - 1; i >= 0; i--) {
		mBoundClientUids.add(boundClientUids.valueAt(i));
		}
		}
		}

		/**
		* Allows background activity starts using token {@code entity}. Optionally, you can provide
		* {@code originatingToken} if you have one such originating token, this is useful for tracing
		* back the grant in the case of the notification token.
		*
		* If {@code entity} is already added, this method will update its {@code originatingToken}.
		*/
		void addOrUpdateAllowBackgroundActivityStartsToken(Binder entity,
		@Nullable IBinder originatingToken) {
		synchronized (this) {
		if (mBackgroundActivityStartTokens == null) {
		mBackgroundActivityStartTokens = new ArrayMap<>();
		}
		mBackgroundActivityStartTokens.put(entity, originatingToken);
		}
		}

		/**
		* Removes token {@code entity} that allowed background activity starts added via {@link
		* #addOrUpdateAllowBackgroundActivityStartsToken(Binder, IBinder)}.
		*/
		void removeAllowBackgroundActivityStartsToken(Binder entity) {
		synchronized (this) {
		if (mBackgroundActivityStartTokens != null) {
		mBackgroundActivityStartTokens.remove(entity);
		}
		}
		}

		/**
		* Returns whether this process is allowed to close system dialogs via a background activity
		* start token that allows the close system dialogs operation (eg. notification).
		*/
		boolean canCloseSystemDialogsByToken(int uid) {
		if (mBackgroundActivityStartCallback == null) {
		return false;
		}
		synchronized (this) {
		if (mBackgroundActivityStartTokens == null
		\|\| mBackgroundActivityStartTokens.isEmpty()) {
		return false;
		}
		return mBackgroundActivityStartCallback.canCloseSystemDialogs(
		mBackgroundActivityStartTokens.values(), uid);
		}
		}

		void dump(PrintWriter pw, String prefix) {
		synchronized (this) {
		if (mBackgroundActivityStartTokens != null
		&& !mBackgroundActivityStartTokens.isEmpty()) {
		pw.print(prefix);
		pw.println("Background activity start tokens (token: originating token):");
		for (int i = mBackgroundActivityStartTokens.size() - 1; i >= 0; i--) {
		pw.print(prefix);
		pw.print(" - ");
		pw.print(mBackgroundActivityStartTokens.keyAt(i));
		pw.print(": ");
		pw.println(mBackgroundActivityStartTokens.valueAt(i));
		}
		}
		if (mBoundClientUids != null && mBoundClientUids.size() > 0) {
		pw.print(prefix);
		pw.print("BoundClientUids:");
		pw.println(Arrays.toString(mBoundClientUids.toArray()));
		}
		}
		}
		}

services/core/java/com/android/server/wm/WindowProcessController.java

+28 −165

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