add query for shared memory size (#1083)

include/tvm/runtime/device_api.h

@@ -19,7 +19,8 @@ enum DeviceAttrKind : int {
   kExist = 0,
   kMaxThreadsPerBlock = 1,
   kWarpSize = 2,
-  kComputeVersion = 3,
+  kMaxSharedMemoryPerBlock = 3,
+  kComputeVersion = 4,
 };
 
 /*! \brief Number of bytes each allocation must align to */

python/tvm/_ffi/runtime_ctypes.py

@@ -141,6 +141,12 @@ class TVMContext(ctypes.Structure):
             self.device_type, self.device_id, 2)
 
     @property
+    def max_shared_memory_per_block(self):
+        """Total amount of shared memory per block in bytes"""
+        return _api_internal._GetDeviceAttr(
+            self.device_type, self.device_id, 3)
+
+    @property
     def compute_version(self):
         """Get compute verison number in string.
 
@@ -152,7 +158,7 @@ class TVMContext(ctypes.Structure):
             The version string in `major.minor` format.
         """
         return _api_internal._GetDeviceAttr(
-            self.device_type, self.device_id, 3)
+            self.device_type, self.device_id, 4)
 
     def sync(self):
         """Synchronize until jobs finished at the context."""

src/runtime/cuda/cuda_device_api.cc

@@ -40,6 +40,11 @@ class CUDADeviceAPI final : public DeviceAPI {
             &value, cudaDevAttrWarpSize, ctx.device_id));
         break;
       }
+      case kMaxSharedMemoryPerBlock: {
+        CUDA_CALL(cudaDeviceGetAttribute(
+            &value, cudaDevAttrMaxSharedMemoryPerBlock, ctx.device_id));
+        break;
+      }
       case kComputeVersion: {
         std::ostringstream os;
         CUDA_CALL(cudaDeviceGetAttribute(