Add TPU to setup

setup.py

@@ -185,7 +185,8 @@ class cmake_build_ext(build_ext):
 
 
 def _is_cuda() -> bool:
-    return torch.version.cuda is not None and not _is_neuron()
+    has_cuda = torch.version.cuda is not None
+    return has_cuda and not (_is_neuron() or _is_tpu())
 
 
 def _is_hip() -> bool:
@@ -201,6 +202,14 @@ def _is_neuron() -> bool:
     return torch_neuronx_installed
 
 
+def _is_tpu() -> bool:
+    return True  # FIXME
+
+
+def _build_custom_ops() -> bool:
+    return _is_cuda() or _is_hip()
+
+
 def _install_punica() -> bool:
     return bool(int(os.getenv("VLLM_INSTALL_PUNICA_KERNELS", "0")))
 
@@ -296,6 +305,8 @@ def get_vllm_version() -> str:
         if neuron_version != MAIN_CUDA_VERSION:
             neuron_version_str = neuron_version.replace(".", "")[:3]
             version += f"+neuron{neuron_version_str}"
+    elif _is_tpu():
+        version += "+tpu"
     else:
         raise RuntimeError("Unknown runtime environment")
 
@@ -322,6 +333,9 @@ def get_requirements() -> List[str]:
     elif _is_neuron():
         with open(get_path("requirements-neuron.txt")) as f:
             requirements = f.read().strip().split("\n")
+    elif _is_tpu():
+        with open(get_path("requirements-tpu.txt")) as f:
+            requirements = f.read().strip().split("\n")
     else:
         raise ValueError(
             "Unsupported platform, please use CUDA, ROCM or Neuron.")
@@ -337,7 +351,7 @@ if _is_cuda():
     if _install_punica():
         ext_modules.append(CMakeExtension(name="vllm._punica_C"))
 
-if not _is_neuron():
+if _build_custom_ops():
     ext_modules.append(CMakeExtension(name="vllm._C"))
 
 package_data = {
@@ -373,6 +387,6 @@ setup(
     python_requires=">=3.8",
     install_requires=get_requirements(),
     ext_modules=ext_modules,
-    cmdclass={"build_ext": cmake_build_ext} if not _is_neuron() else {},
+    cmdclass={"build_ext": cmake_build_ext} if _build_custom_ops() else {},
     package_data=package_data,
 )