[Offload] Add MAX_WORK_GROUP_SIZE device info query (#143718)

This adds a new device info query for the maximum workgroup/block size
for each dimension.

Author: RossBrunton

offload/liboffload/API/Device.td

@@ -31,7 +31,8 @@ def : Enum {
     TaggedEtor<"PLATFORM", "ol_platform_handle_t", "the platform associated with the device">,
     TaggedEtor<"NAME", "char[]", "Device name">,
     TaggedEtor<"VENDOR", "char[]", "Device vendor">,
-    TaggedEtor<"DRIVER_VERSION", "char[]", "Driver version">
+    TaggedEtor<"DRIVER_VERSION", "char[]", "Driver version">,
+    TaggedEtor<"MAX_WORK_GROUP_SIZE", "ol_dimensions_t", "Maximum work group size in each dimension">,
   ];
 }
 

offload/liboffload/src/OffloadImpl.cpp

@@ -302,6 +302,41 @@ Error olGetDeviceInfoImplDetail(ol_device_handle_t Device,
                      "plugin did not provide a response for this information");
   };
 
+  auto getInfoXyz =
+      [&](std::vector<std::string> Names) -> llvm::Expected<ol_dimensions_t> {
+    for (auto &Name : Names) {
+      if (auto Entry = Device->Info.get(Name)) {
+        auto Node = *Entry;
+        ol_dimensions_t Out{0, 0, 0};
+
+        auto getField = [&](StringRef Name, uint32_t &Dest) {
+          if (auto F = Node->get(Name)) {
+            if (!std::holds_alternative<size_t>((*F)->Value))
+              return makeError(
+                  ErrorCode::BACKEND_FAILURE,
+                  "plugin returned incorrect type for dimensions element");
+            Dest = std::get<size_t>((*F)->Value);
+          } else
+            return makeError(ErrorCode::BACKEND_FAILURE,
+                             "plugin didn't provide all values for dimensions");
+          return Plugin::success();
+        };
+
+        if (auto Res = getField("x", Out.x))
+          return Res;
+        if (auto Res = getField("y", Out.y))
+          return Res;
+        if (auto Res = getField("z", Out.z))
+          return Res;
+
+        return Out;
+      }
+    }
+
+    return makeError(ErrorCode::UNIMPLEMENTED,
+                     "plugin did not provide a response for this information");
+  };
+
   switch (PropName) {
   case OL_DEVICE_INFO_PLATFORM:
     return Info.write<void *>(Device->Platform);
@@ -314,6 +349,9 @@ Error olGetDeviceInfoImplDetail(ol_device_handle_t Device,
   case OL_DEVICE_INFO_DRIVER_VERSION:
     return Info.writeString(
         getInfoString({"CUDA Driver Version", "HSA Runtime Version"}));
+  case OL_DEVICE_INFO_MAX_WORK_GROUP_SIZE:
+    return Info.write(getInfoXyz({"Workgroup Max Size per Dimension" /*AMD*/,
+                                  "Maximum Block Dimensions" /*CUDA*/}));
   default:
     return createOffloadError(ErrorCode::INVALID_ENUMERATION,
                               "getDeviceInfo enum '%i' is invalid", PropName);
@@ -339,6 +377,8 @@ Error olGetDeviceInfoImplDetailHost(ol_device_handle_t Device,
     return Info.writeString("Liboffload");
   case OL_DEVICE_INFO_DRIVER_VERSION:
     return Info.writeString(LLVM_VERSION_STRING);
+  case OL_DEVICE_INFO_MAX_WORK_GROUP_SIZE:
+    return Info.write<ol_dimensions_t>(ol_dimensions_t{1, 1, 1});
   default:
     return createOffloadError(ErrorCode::INVALID_ENUMERATION,
                               "getDeviceInfo enum '%i' is invalid", PropName);

offload/tools/offload-tblgen/PrintGen.cpp

@@ -213,6 +213,11 @@ template <typename T> inline void printTagged(llvm::raw_ostream &os, const void
                   "enum {0} value);\n",
                   EnumRec{R}.getName());
   }
+  for (auto *R : Records.getAllDerivedDefinitions("Struct")) {
+    OS << formatv("inline llvm::raw_ostream &operator<<(llvm::raw_ostream &os, "
+                  "const struct {0} param);\n",
+                  StructRec{R}.getName());
+  }
   OS << "\n";
 
   // Create definitions

offload/unittests/OffloadAPI/device/olGetDeviceInfo.cpp

@@ -77,6 +77,15 @@ TEST_P(olGetDeviceInfoTest, SuccessDriverVersion) {
   ASSERT_EQ(std::strlen(DriverVersion.data()), Size - 1);
 }
 
+TEST_P(olGetDeviceInfoTest, SuccessMaxWorkGroupSize) {
+  ol_dimensions_t Value{0, 0, 0};
+  ASSERT_SUCCESS(olGetDeviceInfo(Device, OL_DEVICE_INFO_MAX_WORK_GROUP_SIZE,
+                                 sizeof(Value), &Value));
+  ASSERT_GT(Value.x, 0u);
+  ASSERT_GT(Value.y, 0u);
+  ASSERT_GT(Value.z, 0u);
+}
+
 TEST_P(olGetDeviceInfoTest, InvalidNullHandleDevice) {
   ol_device_type_t DeviceType;
   ASSERT_ERROR(OL_ERRC_INVALID_NULL_HANDLE,

offload/unittests/OffloadAPI/device/olGetDeviceInfoSize.cpp

@@ -44,6 +44,14 @@ TEST_P(olGetDeviceInfoSizeTest, SuccessDriverVersion) {
   ASSERT_NE(Size, 0ul);
 }
 
+TEST_P(olGetDeviceInfoSizeTest, SuccessMaxWorkGroupSize) {
+  size_t Size = 0;
+  ASSERT_SUCCESS(
+      olGetDeviceInfoSize(Device, OL_DEVICE_INFO_MAX_WORK_GROUP_SIZE, &Size));
+  ASSERT_EQ(Size, sizeof(ol_dimensions_t));
+  ASSERT_EQ(Size, sizeof(uint32_t) * 3);
+}
+
 TEST_P(olGetDeviceInfoSizeTest, InvalidNullHandle) {
   size_t Size = 0;
   ASSERT_ERROR(OL_ERRC_INVALID_NULL_HANDLE,