Move SDMA dependencies back to hardware.

SDMA poll packet preemption has been fixed.

Change-Id: I3da878c433d4594a169e3bc8f173d3651448fd2d


[ROCm/ROCR-Runtime commit: f09eb2e8c7]

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -605,39 +605,6 @@ hsa_status_t GpuAgent::PostToolsInit() {
   return HSA_STATUS_SUCCESS;
 }
 
-struct DmaDeps_t {
-  void* dst;
-  const void* src;
-  size_t size;
-  core::Signal* out_signal;
-  core::Blit* blit;
-  std::unique_ptr<std::vector<core::Signal*>> deps;
-};
-
-static bool DmaDeps(hsa_signal_value_t val, void* arg) {
-  DmaDeps_t* Args = (DmaDeps_t*)arg;
-  std::vector<core::Signal*>& deps = *(Args->deps.get());
-  if (val != 0) return true;
-  for (int i = deps.size() - 1; i != 0; i--) {
-    if (deps[i - 1]->LoadRelaxed() != 0) {
-      deps.resize(i);
-      hsa_status_t err = core::Runtime::runtime_singleton_->SetAsyncSignalHandler(
-          core::Signal::Convert(deps.back()), HSA_SIGNAL_CONDITION_EQ, 0, DmaDeps, arg);
-      assert(err == HSA_STATUS_SUCCESS && "Failed to update dependency handler.");
-      return false;
-    }
-  }
-  deps.clear();
-  hsa_status_t stat;
-  do {  // Only ready to run copies are on the SDMA queue so if resources are busy they will soon be
-        // free.
-    stat = Args->blit->SubmitLinearCopyCommand(Args->dst, Args->src, Args->size, deps,
-                                               *(Args->out_signal));
-  } while (stat != HSA_STATUS_SUCCESS);
-  delete Args;
-  return false;
-}
-
 hsa_status_t GpuAgent::DmaCopy(void* dst, const void* src, size_t size) {
   return blits_[BlitDevToDev]->SubmitLinearCopyCommand(dst, src, size);
 }
@@ -663,19 +630,6 @@ hsa_status_t GpuAgent::DmaCopy(void* dst, core::Agent& dst_agent,
     out_signal.async_copy_agent(core::Agent::Convert(this->public_handle()));
   }
 
-  if ((dep_signals.size() != 0) && blit->isSDMA()) {
-    DmaDeps_t* Arg = new DmaDeps_t;
-    Arg->dst = dst;
-    Arg->src = src;
-    Arg->size = size;
-    Arg->out_signal = &out_signal;
-    Arg->blit = (*blit).get();
-    Arg->deps.reset(new std::vector<core::Signal*>(std::move(dep_signals)));
-    hsa_status_t stat = core::Runtime::runtime_singleton_->SetAsyncSignalHandler(
-        core::Signal::Convert(Arg->deps->back()), HSA_SIGNAL_CONDITION_EQ, 0, DmaDeps, Arg);
-    return stat;
-  }
-
   hsa_status_t stat = blit->SubmitLinearCopyCommand(dst, src, size, dep_signals, out_signal);
 
   return stat;