Allow multi-gpu testing on systems without direct peer access

* Allow multi-gpu testing on systems without direct peer access

* remove CheckAccess function

library/src/include/tree_node.h

@@ -830,21 +830,6 @@ struct MultiPlanItem
         return 0;
     }
 
-    // Utility function to check HIP memcpy accessibility between two
-    // devices.  Throws std::runtime_error if access is not possible.
-    static void CheckAccess(rocfft_deviceid_t src, rocfft_deviceid_t dest)
-    {
-        // allow same device, since we'll do normal memcpy instead of
-        // peer memcpy in that case
-        if(src == dest)
-            return;
-        int canAccessPeer = 0;
-        if(hipDeviceCanAccessPeer(&canAccessPeer, src, dest) != hipSuccess)
-            throw std::runtime_error("hipDeviceCanAccessPeer failed");
-        if(!canAccessPeer)
-            throw std::runtime_error("Unable to perform peer-to-peer GPU-direct copies");
-    }
-
     // print a description of this item to the plan log
     virtual void Print(rocfft_ostream& os, const int indent) const = 0;
 

library/src/tree_node.cpp

@@ -434,8 +434,6 @@ void CommScatter::ExecuteAsync(const rocfft_plan     plan,
 
     for(const auto& op : ops)
     {
-        CheckAccess(srcDeviceID, op.destDeviceID);
-
         auto memSize = op.numElems * element_size(precision, arrayType);
 
         auto srcWithOffset
@@ -505,8 +503,6 @@ void CommGather::ExecuteAsync(const rocfft_plan     plan,
         auto&       stream = streams[i];
         auto&       event  = events[i];
 
-        CheckAccess(op.srcDeviceID, destDeviceID);
-
         rocfft_scoped_device dev(op.srcDeviceID);
         stream.alloc();
         event.alloc();