SWDEV-328349 - Rate limit hostcall listener

Update timeout for hostcall wait for signal. If the timeout is small it
checks frequent enough to affect performance for certain applications
which may be CPU bound.

Change-Id: I0a879559e4ad111b09a994a5b82a6faf6e4fea3f

rocclr/device/devhostcall.cpp

@@ -270,17 +270,25 @@ class HostcallListener {
 
 HostcallListener* hostcallListener = nullptr;
 amd::Monitor listenerLock("Hostcall listener lock");
+constexpr static uint64_t kTimeoutFloor = K * K * 4;
+constexpr static uint64_t kTimeoutCeil = K * K * 16;
 
 void HostcallListener::consumePackets() {
-  uint64_t timeout = 1024 * 1024;
+  uint64_t timeout = kTimeoutFloor;
   uint64_t signal_value = SIGNAL_INIT;
   while (true) {
     while (true) {
       uint64_t new_value = doorbell_->Wait(signal_value, device::Signal::Condition::Ne, timeout);
       if (new_value != signal_value) {
         signal_value = new_value;
+        // Reduce the timeout for quicker processing
+        timeout = timeout >> 0x1;
+        timeout = std::max(kTimeoutFloor, timeout);
         break;
       }
+      // Increase the timeout since we dont need to check as frequently
+      timeout = timeout << 0x1;
+      timeout = std::min(kTimeoutCeil, timeout);
     }
 
     if (signal_value == SIGNAL_DONE) {