Guard against IPC signal use of when profiling copy APIs.

Also update IPC signal API text to allow single process profiling with IPC signals.

Change-Id: I90b246623129d57183acb4ba1789beec360547c3

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

@@ -643,7 +643,7 @@ hsa_status_t GpuAgent::DmaCopy(void* dst, core::Agent& dst_agent,
   if (profiling_enabled()) {
     // Track the agent so we could translate the resulting timestamp to system
     // domain correctly.
-    out_signal.async_copy_agent(this);
+    out_signal.async_copy_agent(core::Agent::Convert(this->public_handle()));
   }
 
   hsa_status_t stat = blit->SubmitLinearCopyCommand(dst, src, size, dep_signals, out_signal);

runtime/hsa-runtime/core/runtime/hsa_ext_amd.cpp

@@ -333,6 +333,16 @@ hsa_status_t hsa_amd_profiling_get_async_copy_time(
     return HSA_STATUS_ERROR;
   }
 
+  // Validate the embedded agent pointer if the signal is IPC.
+  if (signal->isIPC()) {
+    for (auto it : core::Runtime::runtime_singleton_->gpu_agents()) {
+      if (it == agent) break;
+    }
+    // If the agent isn't a GPU then it is from a different process or it's a CPU.
+    // Assume it's a CPU and illegal uses will generate garbage data same as kernel completion.
+    agent = core::Runtime::runtime_singleton_->cpu_agents()[0];
+  }
+
   if (agent->device_type() == core::Agent::DeviceType::kAmdGpuDevice) {
     // Translate timestamp from GPU to system domain.
     static_cast<amd::GpuAgentInt*>(agent)->TranslateTime(signal, *time);

runtime/hsa-runtime/inc/hsa_ext_amd.h

@@ -387,8 +387,10 @@ typedef enum {
   HSA_AMD_SIGNAL_AMD_GPU_ONLY = 1,
   /**
    * Signal may be used for interprocess communication.
-   * This signal may not be used with profiling APIs.  Errors or inaccurate
-   * timing data may result from such use.
+   * IPC signals can be read, written, and waited on from any process.
+   * Profiling using an IPC enabled signal is only supported in a single process
+   * at a time.  Producing profiling data in one process and consuming it in
+   * another process is undefined.
    */
   HSA_AMD_SIGNAL_IPC = 2,
 } hsa_amd_signal_attribute_t;