commit 98ffa75d811e2b7deb951cf42eff40488342436e
author Ravneet <rdhanjal@google.com> Wed Mar 02 07:22:46 2022 +0000
committer Ravneet Dhanjal <rdhanjal@google.com> Tue Apr 19 17:12:25 2022 +0000
tree 53f65e453386ae5aac6ec9c7c944c9c1f9866f58
parent 006a15b87f6c7f71895ed208a20cd9ac6406af6a

Add CameraService Watchdog

This CL adds a watchdog used to detect issues in cameraservice/
Camera HAL. It uses a timer that can be customized to monitor calls
and kills the process if a fixed amount of time has elapsed without
a successful execution of the monitored call.

The following cases are included in this CL: flush(), close().
Further cases can be added with the APIs in watchdog.

Test: Manual; Tested by force triggering watchdog with custom timer
values and while(true) or sleep in monitored calls
Bug: 229145451
Merged-In: Ia7b4a3fd9395210800a391c62b4ea757efbb3b00

Change-Id: Ia7b4a3fd9395210800a391c62b4ea757efbb3b00

services/camera/libcameraservice/device3/Camera3Device.cpp

diff --git a/services/camera/libcameraservice/device3/Camera3Device.cpp b/services/camera/libcameraservice/device3/Camera3Device.cpp
index 04e65d4..ddbc8ba 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Device.cpp
@@ -115,6 +115,10 @@
 
 status_t Camera3Device::initializeCommonLocked() {
 
+    /** Start watchdog thread */
+    mCameraServiceWatchdog = new CameraServiceWatchdog();
+    mCameraServiceWatchdog->run("CameraServiceWatchdog");
+
     /** Start up status tracker thread */
     mStatusTracker = new StatusTracker(this);
     status_t res = mStatusTracker->run(String8::format("C3Dev-%s-Status", mId.string()).string());
@@ -316,7 +320,7 @@
 
         // Call close without internal mutex held, as the HAL close may need to
         // wait on assorted callbacks,etc, to complete before it can return.
-        interface->close();
+        mCameraServiceWatchdog->WATCH(interface->close());
 
         flushInflightRequests();
 
@@ -339,6 +343,12 @@
         }
     }
     ALOGI("%s: X", __FUNCTION__);
+
+    if (mCameraServiceWatchdog != NULL) {
+        mCameraServiceWatchdog->requestExit();
+        mCameraServiceWatchdog.clear();
+    }
+
     return res;
 }
 
@@ -1719,7 +1729,12 @@
         mSessionStatsBuilder.stopCounter();
     }
 
-    return mRequestThread->flush();
+    // Calculate expected duration for flush with additional buffer time in ms for watchdog
+    uint64_t maxExpectedDuration = (getExpectedInFlightDuration() + kBaseGetBufferWait) / 1e6;
+    status_t res = mCameraServiceWatchdog->WATCH_CUSTOM_TIMER(mRequestThread->flush(),
+            maxExpectedDuration / kCycleLengthMs, kCycleLengthMs);
+
+    return res;
 }
 
 status_t Camera3Device::prepare(int streamId) {