fixed multiple GPU support

ethminer/MinerAux.h

@@ -375,23 +375,24 @@ public:
 		else if (m_minerType == MinerType::CUDA)
 		{
 #if ETH_ETHASHCUDA || !ETH_TRUE
+			if (m_cudaDeviceCount == 0)
+			{
+				m_cudaDevices[0]  = 0;
+				m_cudaDeviceCount = 1;
+			}
+			EthashCUDAMiner::setDevices(m_cudaDevices, m_cudaDeviceCount);
+			m_miningThreads = m_cudaDeviceCount;
+	
+			EthashCUDAMiner::setNumInstances(m_miningThreads);
 			if (!EthashCUDAMiner::configureGPU(
 				m_localWorkSize,
 				m_globalWorkSizeMultiplier,
 				m_numStreams,
-				m_openclDevice,
 				m_extraGPUMemory,
 				m_cudaHighCPULoad,
 				m_currentBlock
 				))
 				exit(1);
-			if (m_cudaDeviceCount != 0) 
-			{
-				EthashCUDAMiner::setDevices(m_cudaDevices, m_cudaDeviceCount);
-				m_miningThreads = m_cudaDeviceCount;
-			}
-			EthashCUDAMiner::setNumInstances(m_miningThreads);
-			
 #else
 			cerr << "Selected CUDA mining without having compiled with -DETHASHCUDA=1 or -DBUNDLE=cudaminer" << endl;
 			exit(1);
@@ -486,7 +487,7 @@ private:
 		sealers["opencl"] = GenericFarm<EthashProofOfWork>::SealerDescriptor{&EthashGPUMiner::instances, [](GenericMiner<EthashProofOfWork>::ConstructionInfo ci){ return new EthashGPUMiner(ci); }};
 #endif
 #if ETH_ETHASHCUDA
-		sealers["cuda"] = GenericFarm<EthashProofOfWork>::SealerDescriptor{ &EthashGPUMiner::instances, [](GenericMiner<EthashProofOfWork>::ConstructionInfo ci){ return new EthashCUDAMiner(ci); } };
+		sealers["cuda"] = GenericFarm<EthashProofOfWork>::SealerDescriptor{ &EthashCUDAMiner::instances, [](GenericMiner<EthashProofOfWork>::ConstructionInfo ci){ return new EthashCUDAMiner(ci); } };
 #endif
 		f.setSealers(sealers);
 		f.onSolutionFound([&](EthashProofOfWork::Solution) { return false; });

libethash-cuda/ethash_cuda_miner.cpp

@@ -129,6 +129,7 @@ unsigned ethash_cuda_miner::getNumDevices()
 }
 
 bool ethash_cuda_miner::configureGPU(
+	int *	 _devices,
 	unsigned _blockSize,
 	unsigned _gridSize,
 	unsigned _numStreams,
@@ -148,24 +149,29 @@ bool ethash_cuda_miner::configureGPU(
 	uint64_t requiredSize = dagSize + _extraGPUMemory;
 	for (unsigned int i = 0; i < getNumDevices(); i++)
 	{
-		cudaDeviceProp props;
-		CUDA_SAFE_CALL(cudaGetDeviceProperties(&props, i));
-		if (props.totalGlobalMem >= requiredSize)
+		if (_devices[i] != -1) 
 		{
-			ETHCUDA_LOG(
-				"Found suitable CUDA device [" << string(props.name)
-				<< "] with " << props.totalGlobalMem << " bytes of GPU memory"
-				);
-			return true;
+			cudaDeviceProp props;
+			CUDA_SAFE_CALL(cudaGetDeviceProperties(&props, _devices[i]));
+			if (props.totalGlobalMem >= requiredSize)
+			{
+				ETHCUDA_LOG(
+					"Found suitable CUDA device [" << string(props.name)
+					<< "] with " << props.totalGlobalMem << " bytes of GPU memory"
+					);
+			}
+			else
+			{
+				ETHCUDA_LOG(
+					"CUDA device " << string(props.name)
+					<< " has insufficient GPU memory." << to_string(props.totalGlobalMem) <<
+					" bytes of memory found < " << to_string(requiredSize) << " bytes of memory required"
+					);
+				return false;
+			}
 		}
-
-		ETHCUDA_LOG(
-			"CUDA device " << string(props.name)
-			<< " has insufficient GPU memory." << to_string(props.totalGlobalMem) <<
-			" bytes of memory found < " << to_string(requiredSize) << " bytes of memory required"
-			);
 	}
-	return false;
+	return true;
 }
 
 unsigned ethash_cuda_miner::s_extraRequiredGPUMem;

libethash-cuda/ethash_cuda_miner.h

@@ -26,6 +26,7 @@ public:
 	static unsigned getNumDevices();
 	static void listDevices();
 	static bool configureGPU(
+		int *	 _devices,
 		unsigned _blockSize,
 		unsigned _gridSize,
 		unsigned _numStreams,

libethcore/EthashCUDAMiner.cpp

@@ -146,7 +146,7 @@ void EthashCUDAMiner::workLoop()
 			delete m_miner;
 			m_miner = new ethash_cuda_miner;
 
-			unsigned device = instances() > 1 ? (s_devices[index()] > -1 ? s_devices[index()] : index()) : s_deviceId;
+			unsigned device = s_devices[index()] > -1 ? s_devices[index()] : index();
 
 			EthashAux::FullType dag;
 			while (true)
@@ -202,19 +202,18 @@ bool EthashCUDAMiner::configureGPU(
 	unsigned _blockSize,
 	unsigned _gridSize,
 	unsigned _numStreams,
-	unsigned _deviceId,
 	unsigned _extraGPUMemory,
 	bool _highcpu,
 	uint64_t _currentBlock
 	)
 {
-	s_deviceId = _deviceId;
 	if (_blockSize != 32 && _blockSize != 64 && _blockSize != 128)
 	{
 		cout << "Given localWorkSize of " << toString(_blockSize) << "is invalid. Must be either 32,64 or 128" << endl;
 		return false;
 	}
 	if (!ethash_cuda_miner::configureGPU(
+		s_devices,
 		_blockSize,
 		_gridSize,
 		_numStreams,

libethcore/EthashCUDAMiner.h

@@ -51,7 +51,6 @@ namespace eth
 			unsigned _blockSize,
 			unsigned _gridSize,
 			unsigned _numStreams,
-			unsigned _deviceId,
 			unsigned _extraGPUMemory,
 			bool	 _highcpu,
 			uint64_t _currentBlock