OpenCL: Drop "allow CPU" option

ethminer/MinerAux.h

@@ -288,10 +288,6 @@ public:
 		else if ((arg == "--cl-extragpu-mem" || arg == "--cuda-extragpu-mem") && i + 1 < argc)
 			m_extraGPUMemory = 1000000 * stol(argv[++i]);
 #endif
-#if ETH_ETHASHCL
-		else if (arg == "--allow-opencl-cpu")
-			m_clAllowCPU = true;
-#endif
 #if ETH_ETHASHCUDA
 		else if (arg == "--cuda-devices")
 		{
@@ -477,7 +473,6 @@ public:
 					m_globalWorkSizeMultiplier,
 					m_openclPlatform,
 					m_openclDevice,
-					m_clAllowCPU,
 					m_extraGPUMemory,
 					0,
 					m_dagLoadMode,
@@ -567,7 +562,6 @@ public:
 			<< "    --opencl-device <n>  When mining using -G/--opencl use OpenCL device n (default: 0)." << endl
 			<< "    --opencl-devices <0 1 ..n> Select which OpenCL devices to mine on. Default is to use all" << endl
 			<< "    -t, --mining-threads <n> Limit number of CPU/GPU miners to n (default: use everything available on selected platform)" << endl
-			<< "    --allow-opencl-cpu Allows CPU to be considered as an OpenCL device if the OpenCL platform supports it." << endl
 			<< "    --list-devices List the detected OpenCL/CUDA devices and exit. Should be combined with -G or -U flag" << endl
 			<< "    -L, --dag-load-mode <mode> DAG generation mode." << endl
 			<< "        parallel    - load DAG on all GPUs at the same time (default)" << endl
@@ -1012,7 +1006,6 @@ private:
 	unsigned m_openclDevice = 0;
 	unsigned m_miningThreads = UINT_MAX;
 	bool m_shouldListDevices = false;
-	bool m_clAllowCPU = false;
 #if ETH_ETHASHCL
 	unsigned m_openclDeviceCount = 0;
 	unsigned m_openclDevices[16];

libethash-cl/ethash_cl_miner.cpp

@@ -84,8 +84,6 @@ static std::atomic_flag s_logSpin = ATOMIC_FLAG_INIT;
 #else
 #define ETHCL_LOG(_contents) cout << "[OPENCL]:" << _contents << endl
 #endif
-// Types of OpenCL devices we are interested in
-#define ETHCL_QUERIED_DEVICE_TYPES (CL_DEVICE_TYPE_GPU | CL_DEVICE_TYPE_ACCELERATOR)
 
 static void addDefinition(string& _source, char const* _id, unsigned _value)
 {
@@ -154,7 +152,7 @@ std::vector<cl::Device> ethash_cl_miner::getDevices(std::vector<cl::Platform> co
 	try
 	{
 		_platforms[platform_num].getDevices(
-			s_allowCPU ? CL_DEVICE_TYPE_ALL : ETHCL_QUERIED_DEVICE_TYPES,
+			CL_DEVICE_TYPE_GPU | CL_DEVICE_TYPE_ACCELERATOR,
 			&devices
 		);
 	}
@@ -194,14 +192,12 @@ bool ethash_cl_miner::configureGPU(
 	unsigned _platformId,
 	unsigned _localWorkSize,
 	unsigned _globalWorkSize,
-	bool _allowCPU,
 	unsigned _extraGPUMemory,
 	uint64_t _currentBlock
 )
 {
 	s_workgroupSize = _localWorkSize;
 	s_initialGlobalWorkSize = _globalWorkSize;
-	s_allowCPU = _allowCPU;
 	s_extraRequiredGPUMem = _extraGPUMemory;
 
 	// by default let's only consider the DAG of the first epoch
@@ -230,7 +226,6 @@ bool ethash_cl_miner::configureGPU(
 	);
 }
 
-bool ethash_cl_miner::s_allowCPU = false;
 unsigned ethash_cl_miner::s_extraRequiredGPUMem;
 unsigned ethash_cl_miner::s_workgroupSize = ethash_cl_miner::c_defaultLocalWorkSize;
 unsigned ethash_cl_miner::s_initialGlobalWorkSize = ethash_cl_miner::c_defaultGlobalWorkSizeMultiplier * ethash_cl_miner::c_defaultLocalWorkSize;

libethash-cl/ethash_cl_miner.h

@@ -54,7 +54,6 @@ public:
 		unsigned _platformId,
 		unsigned _localWorkSize,
 		unsigned _globalWorkSize,
-		bool _allowCPU,
 		unsigned _extraGPUMemory,
 		uint64_t _currentBlock
 	);
@@ -97,8 +96,6 @@ private:
 	static unsigned s_initialGlobalWorkSize;
 	/// The target milliseconds per batch for the search. If 0, then no adjustment will happen
 	static unsigned s_msPerBatch;
-	/// Allow CPU to appear as an OpenCL device or not. Default is false
-	static bool s_allowCPU;
 	/// GPU memory required for other things, like window rendering e.t.c.
 	/// User can set it via the --cl-extragpu-mem argument.
 	static unsigned s_extraRequiredGPUMem;

libethcore/EthashGPUMiner.cpp

@@ -206,7 +206,6 @@ bool EthashGPUMiner::configureGPU(
 	unsigned _globalWorkSizeMultiplier,
 	unsigned _platformId,
 	unsigned _deviceId,
-	bool _allowCPU,
 	unsigned _extraGPUMemory,
 	uint64_t _currentBlock,
 	unsigned _dagLoadMode,
@@ -225,7 +224,6 @@ bool EthashGPUMiner::configureGPU(
 			_platformId,
 			_localWorkSize,
 			_globalWorkSizeMultiplier * _localWorkSize,
-			_allowCPU,
 			_extraGPUMemory,
 			_currentBlock
 			)

libethcore/EthashGPUMiner.h

@@ -53,7 +53,6 @@ public:
 		unsigned _globalWorkSizeMultiplier,
 		unsigned _platformId,
 		unsigned _deviceId,
-		bool _allowCPU,
 		unsigned _extraGPUMemory,
 		uint64_t _currentBlock,
 		unsigned _dagLoadMode,