diff --git a/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td b/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
--- a/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
+++ b/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
@@ -520,16 +520,8 @@
       /*methodBody=*/"",
       /*defaultImplementation=*/[{
         unsigned bbArgNumber = opOperand->getOperandNumber();
-        // Safeguard against the named linalg ops that are manually defined and
-        // that only support buffer semantics: we should not be there.
-        // Such ops have an empty regionBuilder and are not constructed with a
-        // region for now. In the future they are slated to disappear.
-        assert(this->getOperation()->getNumRegions() == 1 && "unexpected "
-               "missing region (calling `payloadUsesValueFromOperand` on "
-               "manually defined named Linalg op?)");
-        Block &block = this->getOperation()->getRegion(0).front();
         // Init tensors have uses.
-        return !block.getArgument(bbArgNumber).use_empty();
+        return !getBlock()->getArgument(bbArgNumber).use_empty();
       }]
     >,
     InterfaceMethod<
@@ -604,8 +596,7 @@
       /*args=*/(ins),
       /*methodBody=*/"",
       /*defaultImplementation=*/[{
-        Block &entryBlock = this->getOperation()->getRegion(0).front();
-        return entryBlock.getArguments().take_back(this->getNumOutputs());
+        return getBlock()->getArguments().take_back(this->getNumOutputs());
       }]
     >,
     InterfaceMethod<
@@ -671,6 +662,21 @@
     //===------------------------------------------------------------------===//
     // Other interface methods.
     //===------------------------------------------------------------------===//
+    InterfaceMethod<
+      /*desc=*/[{
+        Return the single block constituting the body of the operation by
+        calling the getBody method on the concrete operation.
+      }],
+      /*retTy=*/"Block*",
+      /*methodName=*/"getBlock",
+      /*args=*/(ins),
+      /*methodBody=*/"",
+      /*defaultImplementation=*/[{
+        // Assume the concrete operation implements the
+        // SingleBlockImplicitTerminator trait.
+        return $_op.getBody();
+      }]
+    >,
     InterfaceMethod<
       /*desc=*/[{
         Return the iterator types attribute within the current operation.
diff --git a/mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td b/mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td
--- a/mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td
+++ b/mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td
@@ -26,14 +26,14 @@
 // depending on the specific Linalg op.
 class LinalgStructuredBase_Op<string mnemonic, list<OpTrait> props>
   : Op<Linalg_Dialect, mnemonic, !listconcat([
-       LinalgStructuredInterface, ReifyRankedShapedTypeOpInterface], props)> {
+       SingleBlockImplicitTerminator<"YieldOp">,
+       DeclareOpInterfaceMethods<MemoryEffectsOpInterface>,
+       LinalgStructuredInterface,
+       ReifyRankedShapedTypeOpInterface], props)> {
   code structuredOpsBaseDecls = [{
     // Return whether the op accesses the iteration indices.
     bool hasIndexSemantics() {
-      Operation *op = this->getOperation();
-      if(op->getNumRegions() == 0 || op->getRegion(0).empty())
-        return false;
-      return !op->getRegion(0).front().getOps<IndexOp>().empty();
+      return !this->getBody()->getOps<IndexOp>().empty();
     }
 
     LogicalResult reifyResultShapes(OpBuilder &b,
@@ -45,9 +45,7 @@
 }
 
 class LinalgStructured_Op<string mnemonic, list<OpTrait> props>
-  : LinalgStructuredBase_Op<mnemonic,
-       !listconcat(props, [
-         DeclareOpInterfaceMethods<MemoryEffectsOpInterface>])> {
+  : LinalgStructuredBase_Op<mnemonic, !listconcat(props, [])> {
   code structuredOpsDecls = structuredOpsBaseDecls # [{
     std::string getLibraryCallName() {
       return generateLibraryCallName(getOperation());
@@ -226,10 +224,7 @@
 // Generic Linalg ops.
 //===----------------------------------------------------------------------===//
 
-def GenericOp : LinalgStructuredBase_Op<"generic", [
-    AttrSizedOperandSegments,
-    DeclareOpInterfaceMethods<MemoryEffectsOpInterface>,
-    SingleBlockImplicitTerminator<"YieldOp">]> {
+def GenericOp : LinalgStructuredBase_Op<"generic", [AttrSizedOperandSegments]> {
   let description = [{
     Generic Linalg op form where the key properties of the computation are
     specified as attributes. In pretty form, a `linalg.generic` op is written
diff --git a/mlir/lib/Dialect/Linalg/IR/LinalgInterfaces.cpp b/mlir/lib/Dialect/Linalg/IR/LinalgInterfaces.cpp
--- a/mlir/lib/Dialect/Linalg/IR/LinalgInterfaces.cpp
+++ b/mlir/lib/Dialect/Linalg/IR/LinalgInterfaces.cpp
@@ -683,17 +683,10 @@
     }
   }
 
-  // Named ops that are defined manually have a region builder but no region at
-  // this time. Assume the region is well-formed by specification.
-  // TODO: use linalg-ods-gen for all ops when we have enough expressive power.
-  if (linalgOp->getNumRegions() == 0) {
-    assert(!linalgOp.getRegionBuilder() && "regionBuilder but no region");
-    return success();
-  }
-
-  auto &region = linalgOp->getRegion(0);
-  if (linalgOp->getNumRegions() > 1 || !llvm::hasSingleElement(region))
-    return op->emitOpError("expected 1 region with 1 block");
+  // Check the region has exactly one block.
+  if (linalgOp->getNumRegions() != 1 ||
+      !llvm::hasSingleElement(linalgOp->getRegion(0)))
+    return op->emitOpError("expects to have 1 region with 1 block");
 
   if (!linalgOp.getShapesToLoopsMap())
     return op->emitOpError("expected the shape-to-loops map to be non-null");
diff --git a/mlir/lib/Dialect/Linalg/Transforms/DropUnitDims.cpp b/mlir/lib/Dialect/Linalg/Transforms/DropUnitDims.cpp
--- a/mlir/lib/Dialect/Linalg/Transforms/DropUnitDims.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/DropUnitDims.cpp
@@ -149,12 +149,8 @@
 static void replaceUnitDimIndexOps(GenericOp genericOp,
                                    const DenseSet<unsigned> &unitDims,
                                    PatternRewriter &rewriter) {
-  assert(genericOp->getNumRegions() == 1 &&
-         genericOp->getRegion(0).getBlocks().size() == 1 &&
-         "expected generic operation to have one block.");
-  Block &block = genericOp->getRegion(0).front();
-
-  for (IndexOp indexOp : llvm::make_early_inc_range(block.getOps<IndexOp>())) {
+  for (IndexOp indexOp :
+       llvm::make_early_inc_range(genericOp.getBody()->getOps<IndexOp>())) {
     OpBuilder::InsertionGuard guard(rewriter);
     rewriter.setInsertionPoint(indexOp);
     if (unitDims.count(indexOp.dim()) != 0) {
diff --git a/mlir/lib/Dialect/Linalg/Transforms/Generalization.cpp b/mlir/lib/Dialect/Linalg/Transforms/Generalization.cpp
--- a/mlir/lib/Dialect/Linalg/Transforms/Generalization.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/Generalization.cpp
@@ -50,27 +50,15 @@
   SmallVector<RankedTensorType> resultTypes = namedOp.getOutputTensorTypes();
   SmallVector<Type> types(resultTypes.begin(), resultTypes.end());
 
-  // Inline the existing region if the named operation has a region attached.
-  if (namedOp->getNumRegions() == 1) {
-    GenericOp genericOp =
-        rewriter.create<GenericOp>(namedOp.getLoc(), types, inputOperands,
-                                   outputOperands, indexingMaps, iterators);
-    rewriter.inlineRegionBefore(namedOp->getRegion(0), genericOp.region(),
-                                genericOp.region().begin());
-    return genericOp;
-  }
-
-  // Otherwise use the region builder to generate a new region.
-  // TODO: Remove this path once all linag operations have a region attached.
-  auto regionBuilder = namedOp.getRegionBuilder();
-  assert(regionBuilder && "expect the operation to have region builder");
-  return rewriter.create<GenericOp>(
-      namedOp.getLoc(), types, inputOperands, outputOperands, indexingMaps,
-      iterators,
-      [&regionBuilder](OpBuilder &bodyBuilder, Location loc, ValueRange) {
-        ImplicitLocOpBuilder b(loc, bodyBuilder);
-        regionBuilder(b, *bodyBuilder.getBlock());
-      });
+  // All named ops have a region attached that can be inlined.
+  assert(namedOp->getNumRegions() == 1 &&
+         "expect named op to have one region attached");
+  GenericOp genericOp =
+      rewriter.create<GenericOp>(namedOp.getLoc(), types, inputOperands,
+                                 outputOperands, indexingMaps, iterators);
+  rewriter.inlineRegionBefore(namedOp->getRegion(0), genericOp.region(),
+                              genericOp.region().begin());
+  return genericOp;
 }
 
 namespace {
diff --git a/mlir/lib/Dialect/Linalg/Transforms/Interchange.cpp b/mlir/lib/Dialect/Linalg/Transforms/Interchange.cpp
--- a/mlir/lib/Dialect/Linalg/Transforms/Interchange.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/Interchange.cpp
@@ -77,15 +77,9 @@
 
   // 4. Transform the index operations by applying the permutation map.
   if (genericOp.hasIndexSemantics()) {
-    // TODO: Remove the assertion and add a getBody() method to LinalgOp
-    // interface once every LinalgOp has a body.
-    assert(genericOp->getNumRegions() == 1 &&
-           genericOp->getRegion(0).getBlocks().size() == 1 &&
-           "expected generic operation to have one block.");
-    Block &block = genericOp->getRegion(0).front();
     OpBuilder::InsertionGuard guard(rewriter);
     for (IndexOp indexOp :
-         llvm::make_early_inc_range(block.getOps<IndexOp>())) {
+         llvm::make_early_inc_range(genericOp.getBody()->getOps<IndexOp>())) {
       rewriter.setInsertionPoint(indexOp);
       SmallVector<Value> allIndices;
       allIndices.reserve(genericOp.getNumLoops());
diff --git a/mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp b/mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp
--- a/mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp
@@ -479,8 +479,6 @@
     if (!linalgOp.getTiedIndexingMap(opOperand).isIdentity())
       return false;
   }
-  if (linalgOp->getNumRegions() != 1)
-    return false;
   return hasOnlyScalarElementwiseOp(linalgOp->getRegion(0));
 }
 
@@ -510,10 +508,7 @@
     OpBuilder &b, LinalgOp linalgOp, SmallVectorImpl<Value> &newResults,
     bool broadcastToMaximalCommonShape = false,
     ArrayRef<CustomVectorizationHook> customVectorizationHooks = {}) {
-  // 1. Fail to vectorize if the operation does not have one non-empty region.
-  if (linalgOp->getNumRegions() != 1 || linalgOp->getRegion(0).empty())
-    return failure();
-  auto &block = linalgOp->getRegion(0).front();
+  Block *block = linalgOp.getBlock();
 
   // 2. Values defined above the region can only be broadcast for now. Make them
   // map to themselves.
@@ -533,7 +528,7 @@
   // 3. Turn all BBArgs into vector.transfer_read / load.
   SmallVector<AffineMap> indexings;
   for (OpOperand *opOperand : linalgOp.getInputAndOutputOperands()) {
-    BlockArgument bbarg = block.getArgument(opOperand->getOperandNumber());
+    BlockArgument bbarg = block->getArgument(opOperand->getOperandNumber());
     if (linalgOp.isScalar(opOperand)) {
       bvm.map(bbarg, opOperand->get());
       continue;
@@ -580,7 +575,7 @@
   hooks.push_back(vectorizeIndex);
 
   // 5. Iteratively call `vectorizeOneOp` to each op in the slice.
-  for (Operation &op : block.getOperations()) {
+  for (Operation &op : block->getOperations()) {
     VectorizationResult result = vectorizeOneOp(b, &op, bvm, hooks);
     if (result.status == VectorizationStatus::Failure) {
       LDBG("failed to vectorize: " << op);
diff --git a/mlir/lib/Dialect/Linalg/Utils/Utils.cpp b/mlir/lib/Dialect/Linalg/Utils/Utils.cpp
--- a/mlir/lib/Dialect/Linalg/Utils/Utils.cpp
+++ b/mlir/lib/Dialect/Linalg/Utils/Utils.cpp
@@ -768,12 +768,7 @@
 void addTileLoopIvsToIndexOpResults(OpBuilder &b, LinalgOp tiledOp,
                                     ArrayRef<Value> ivs) {
   if (tiledOp.hasIndexSemantics()) {
-    assert(tiledOp->getNumRegions() == 1 &&
-           tiledOp->getRegion(0).getBlocks().size() == 1 &&
-           "expect producer to have one block.");
-    // Shift all IndexOp results by the tile offset.
-    Block &block = tiledOp->getRegion(0).front();
-    for (IndexOp indexOp : block.getOps<IndexOp>()) {
+    for (IndexOp indexOp : tiledOp.getBlock()->getOps<IndexOp>()) {
       if (ivs[indexOp.dim()] == nullptr)
         continue;
       OpBuilder::InsertionGuard guard(b);
diff --git a/mlir/test/Dialect/Linalg/invalid.mlir b/mlir/test/Dialect/Linalg/invalid.mlir
--- a/mlir/test/Dialect/Linalg/invalid.mlir
+++ b/mlir/test/Dialect/Linalg/invalid.mlir
@@ -160,7 +160,7 @@
 
 func @generic_empty_region(%arg0: memref<f32>) {
   %f0 = arith.constant 0.0: f32
-  // expected-error @+1 {{op expected 1 region with 1 block}}
+  // expected-error @+1 {{op expects region #0 to have 0 or 1 blocks}}
   linalg.generic {
     indexing_maps =  [ affine_map<() -> ()>, affine_map<() -> ()> ],
     iterator_types = []}
@@ -177,7 +177,7 @@
 
 func @generic_empty_region(%arg0: memref<f32>) {
   %f0 = arith.constant 0.0: f32
-  // expected-error @+1 {{linalg.generic' op expected 1 region with 1 block}}
+  // expected-error @+1 {{op expects to have 1 region with 1 block}}
   linalg.generic {
     indexing_maps =  [ affine_map<() -> ()> , affine_map<() -> ()> ],
     iterator_types = []}
diff --git a/mlir/test/lib/Dialect/Test/TestOps.td b/mlir/test/lib/Dialect/Test/TestOps.td
--- a/mlir/test/lib/Dialect/Test/TestOps.td
+++ b/mlir/test/lib/Dialect/Test/TestOps.td
@@ -2303,7 +2303,7 @@
 }
 
 def TestLinalgConvOp :
-  TEST_Op<"linalg_conv_op", [AttrSizedOperandSegments,
+  TEST_Op<"linalg_conv_op", [AttrSizedOperandSegments, SingleBlock,
       LinalgStructuredInterface, LinalgConvolutionOpInterface]> {
 
   let arguments = (ins Variadic<AnyType>:$inputs,
diff --git a/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp b/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
--- a/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
+++ b/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
@@ -443,10 +443,7 @@
 // Op definition for {0}
 //===----------------------------------------------------------------------===//
 
-def {0} : LinalgStructuredBase_Op<"{1}", !listconcat([
-  AttrSizedOperandSegments,
-  DeclareOpInterfaceMethods<MemoryEffectsOpInterface>,
-  SingleBlockImplicitTerminator<"YieldOp">],
+def {0} : LinalgStructuredBase_Op<"{1}", !listconcat([AttrSizedOperandSegments],
   /*extraInterfaces=*/[{2}])> {
     {3}
     let arguments = (ins