[Kernel][Hardware][Amd]Custom paged attention kernel for rocm

CMakeLists.txt

@@ -313,12 +313,35 @@ define_gpu_extension_target(
   WITH_SOABI)
 
 
+if(VLLM_GPU_LANG STREQUAL "HIP")
+  #
+  # _rocm_C extension
+  #
+  set(VLLM_ROCM_EXT_SRC
+    "csrc/rocm/torch_bindings.cpp"
+    "csrc/rocm/attention.cu")
+
+  define_gpu_extension_target(
+    _rocm_C
+    DESTINATION vllm
+    LANGUAGE ${VLLM_GPU_LANG}
+    SOURCES ${VLLM_ROCM_EXT_SRC}
+    COMPILE_FLAGS ${VLLM_GPU_FLAGS}
+    ARCHITECTURES ${VLLM_GPU_ARCHES}
+    USE_SABI 3
+    WITH_SOABI)
+endif()
+
 
 if(VLLM_GPU_LANG STREQUAL "CUDA" OR VLLM_GPU_LANG STREQUAL "HIP")
   message(STATUS "Enabling C extension.")
   add_dependencies(default _C)
 
   message(STATUS "Enabling moe extension.")
   add_dependencies(default _moe_C)
-
 endif()
+
+if(VLLM_GPU_LANG STREQUAL "HIP")
+  message(STATUS "Enabling rocm extension.")
+  add_dependencies(default _rocm_C)
+endif()