media utils: dump audio HAL service before restarting audioserver
Add request to create tombstones of audio HAL servers before restarting
audioserver process when the watchdog triggers.
Add audio device factory HAL interface API to retrieve HAL process pids when
possible (on debug builds).
Add AudioFlinger service API to set audio HAL process pids from
JAVA AudioService.
Bug: 141528385
Test: Force watchdog and verify tombstone creation
Change-Id: I68c1e8fb4db23e5952ad0c93d7d0b9d121b8ec18
diff --git a/media/utils/TimeCheck.cpp b/media/utils/TimeCheck.cpp
index 96f7802..4a3e470 100644
--- a/media/utils/TimeCheck.cpp
+++ b/media/utils/TimeCheck.cpp
@@ -14,13 +14,50 @@
* limitations under the License.
*/
+#define LOG_TAG "TimeCheck"
#include <utils/Log.h>
#include <mediautils/TimeCheck.h>
#include <mediautils/EventLog.h>
+#include "debuggerd/handler.h"
namespace android {
+// Audio HAL server pids vector used to generate audio HAL processes tombstone
+// when audioserver watchdog triggers.
+// We use a lockless storage to avoid potential deadlocks in the context of watchdog
+// trigger.
+// Protection again simultaneous writes is not needed given one update takes place
+// during AudioFlinger construction and other comes necessarily later once the IAudioFlinger
+// interface is available.
+// The use of an atomic index just guaranties that current vector is fully initialized
+// when read.
+/* static */
+void TimeCheck::accessAudioHalPids(std::vector<pid_t>* pids, bool update) {
+ static constexpr int kNumAudioHalPidsVectors = 3;
+ static std::vector<pid_t> audioHalPids[kNumAudioHalPidsVectors];
+ static std::atomic<int> curAudioHalPids = 0;
+
+ if (update) {
+ audioHalPids[(curAudioHalPids + 1) % kNumAudioHalPidsVectors] = *pids;
+ curAudioHalPids++;
+ } else {
+ *pids = audioHalPids[curAudioHalPids];
+ }
+}
+
+/* static */
+void TimeCheck::setAudioHalPids(const std::vector<pid_t>& pids) {
+ accessAudioHalPids(&(const_cast<std::vector<pid_t>&>(pids)), true);
+}
+
+/* static */
+std::vector<pid_t> TimeCheck::getAudioHalPids() {
+ std::vector<pid_t> pids;
+ accessAudioHalPids(&pids, false);
+ return pids;
+}
+
/* static */
sp<TimeCheck::TimeCheckThread> TimeCheck::getTimeCheckThread()
{
@@ -83,6 +120,18 @@
status = mCond.waitRelative(mMutex, waitTimeNs);
}
if (status != NO_ERROR) {
+ // Generate audio HAL processes tombstones and allow time to complete
+ // before forcing restart
+ std::vector<pid_t> pids = getAudioHalPids();
+ if (pids.size() != 0) {
+ for (const auto& pid : pids) {
+ ALOGI("requesting tombstone for pid: %d", pid);
+ sigqueue(pid, DEBUGGER_SIGNAL, {.sival_int = 0});
+ }
+ sleep(1);
+ } else {
+ ALOGI("No HAL process pid available, skipping tombstones");
+ }
LOG_EVENT_STRING(LOGTAG_AUDIO_BINDER_TIMEOUT, tag);
LOG_ALWAYS_FATAL("TimeCheck timeout for %s", tag);
}