SWDEV-436796 - Enable device memory for kernel arguments

Extra CPU read back will be performed before every submission to make sure
previous writes over PCIE reached GPU. HDP flush is done by CP.

Change-Id: I402d28ca26c8cee4a3920feb3599af8c285d0889

rocclr/device/pal/palconstbuf.hpp

@@ -65,6 +65,10 @@ class ManagedBuffer : public amd::EmbeddedObject {
   //! Returns VirtualGPU object this managed resource associated
   VirtualGPU& gpu() const { return gpu_; }
 
+  void CpuReadBack() const {
+    volatile auto tmp = *reinterpret_cast<uint64_t*>(pool_[activeBuffer_].buf->data());
+  }
+
  private:
   struct TimeStampedBuffer {
     Memory* buf;

rocclr/device/pal/palsettings.cpp

@@ -143,7 +143,7 @@ Settings::Settings() {
   alwaysResident_ = amd::IS_HIP ? true : false;
   prepinnedMinSize_ = 0;
   cpDmaCopySizeMax_ = GPU_CP_DMA_COPY_SIZE * Ki;
-  useDeviceKernelArg_ = flagIsDefault(HIP_FORCE_DEV_KERNARG) ? false : HIP_FORCE_DEV_KERNARG;
+  useDeviceKernelArg_ = flagIsDefault(HIP_FORCE_DEV_KERNARG) ? true : HIP_FORCE_DEV_KERNARG;
 
   limit_blit_wg_ = 16;
 }

rocclr/device/pal/palvirtual.cpp

@@ -370,8 +370,9 @@ void VirtualGPU::Queue::addCmdDoppRef(Pal::IGpuMemory* iMem, bool lastDoppCmd, b
 // ================================================================================================
 bool VirtualGPU::Queue::flush() {
   amd::ScopedLock l(lock_);
+  const Settings& settings = gpu_.dev().settings();
 
-  if (!gpu_.dev().settings().alwaysResident_ && palMemRefs_.size() != 0) {
+  if (!settings.alwaysResident_ && palMemRefs_.size() != 0) {
     if (Pal::Result::Success !=
         iDev_->AddGpuMemoryReferences(palMemRefs_.size(), &palMemRefs_[0], iQueue_,
                                       Pal::GpuMemoryRefCantTrim)) {
@@ -410,10 +411,15 @@ bool VirtualGPU::Queue::flush() {
   submitInfo.fenceCount           = 1;
   submitInfo.ppFences             = &iCmdFences_[cmdBufIdSlot_];
 
-  if (amd::IS_HIP) {
-    // HIP disables per resource tracking, because the app may embed SVM ptr into other buffers.
-    // Force CPU sync if there are pending operations on SDMA, until OS fences will be added
-    if (iQueue_->Type() == Pal::QueueTypeCompute) {
+  if (iQueue_->Type() == Pal::QueueTypeCompute) {
+    if (settings.useDeviceKernelArg_) {
+      // If runtime uses device memory for kernel arguments, then perform a CPU read back on
+      // submission. That will make sure NBIO puches all previous CPU write requests through PCIE
+      gpu_.managedBuffer().CpuReadBack();
+    }
+    if (amd::IS_HIP) {
+      // HIP disables per resource tracking, because the app may embed SVM ptr into other buffers.
+      // Force CPU sync if there are pending operations on SDMA, until OS fences will be added
       gpu_.WaitForIdleSdma();
     }
   }
@@ -487,7 +493,7 @@ bool VirtualGPU::Queue::flush() {
       }
     }
   }
-  if (!gpu_.dev().settings().alwaysResident_ && palMems_.size() != 0) {
+  if (!settings.alwaysResident_ && palMems_.size() != 0) {
     iDev_->RemoveGpuMemoryReferences(palMems_.size(), &palMems_[0], iQueue_);
     palMems_.clear();
   }