diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -712,7 +712,11 @@
   endif()
 
   if(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED)
+    string(TOUPPER "${BOOTSTRAP_LLVM_BUILD_INSTRUMENTED}"
+    uppercase_BOOTSTRAP_LLVM_BUILD_INSTRUMENTED)
     add_dependencies(clang-bootstrap-deps llvm-profdata)
+    if (uppercase_BOOTSTRAP_LLVM_BUILD_INSTRUMENTED STREQUAL "CSSPGO")
+    endif()
     set(PGO_OPT -DLLVM_PROFDATA=${LLVM_RUNTIME_OUTPUT_INTDIR}/llvm-profdata)
   endif()
 
diff --git a/clang/utils/perf-training/CMakeLists.txt b/clang/utils/perf-training/CMakeLists.txt
--- a/clang/utils/perf-training/CMakeLists.txt
+++ b/clang/utils/perf-training/CMakeLists.txt
@@ -14,6 +14,24 @@
     DEPENDS clang clear-profraw ${CLANG_PERF_TRAINING_DEPS}
     )
 
+  string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
+  if (uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSSPGO")
+    if(NOT LLVM_PROFGEN)
+      find_program(LLVM_PROFGEN llvm-profgen)
+    endif()
+
+    if(NOT LLVM_PROFGEN)
+      message(STATUS "To enable converting CSSPGO samples LLVM_PROFGEN has to point to
+      llvm-profgen")
+    endif()
+
+    # Convert perf profiles into profraw
+    add_custom_target(convert-perf-profraw
+      COMMAND "${Python3_EXECUTABLE}"
+      ${CMAKE_CURRENT_SOURCE_DIR}/perf-helper.py perf2prof ${LLVM_PROFGEN}
+      $<TARGET_FILE:clang> ${CMAKE_CURRENT_BINARY_DIR}
+  endif()
+
   add_custom_target(clear-profraw
     COMMAND "${Python3_EXECUTABLE}" ${CMAKE_CURRENT_SOURCE_DIR}/perf-helper.py clean ${CMAKE_CURRENT_BINARY_DIR} profraw
     COMMENT "Clearing old profraw data")
diff --git a/clang/utils/perf-training/lit.cfg b/clang/utils/perf-training/lit.cfg
--- a/clang/utils/perf-training/lit.cfg
+++ b/clang/utils/perf-training/lit.cfg
@@ -28,6 +28,12 @@
 config.suffixes = ['.c', '.cc', '.cpp', '.m', '.mm', '.cu', '.ll', '.cl', '.s', '.S', '.modulemap', '.test']
 
 cc1_wrapper = '%s %s/perf-helper.py cc1' % (config.python_exe, config.perf_helper_dir)
+if config.llvm_build_instrumented.upper() = "CSSPGO":
+    perf_wrapper = "%s %s/perf-helper.py perf --lbr --call-graph -- " % (
+        config.python_exe,
+        config.perf_helper_dir,
+    )
+    cc1_wrapper = perf_wrapper + cc1_wrapper
 
 use_lit_shell = os.environ.get("LIT_USE_INTERNAL_SHELL")
 config.test_format = lit.formats.ShTest(use_lit_shell == "0")
diff --git a/clang/utils/perf-training/lit.site.cfg.in b/clang/utils/perf-training/lit.site.cfg.in
--- a/clang/utils/perf-training/lit.site.cfg.in
+++ b/clang/utils/perf-training/lit.site.cfg.in
@@ -8,6 +8,7 @@
 config.test_source_root = "@CLANG_PGO_TRAINING_DATA@"
 config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.python_exe = "@Python3_EXECUTABLE@"
+config.llvm_build_instrumented = "@LLVM_BUILD_INSTRUMENTED@"
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@CLANG_SOURCE_DIR@/utils/perf-training/lit.cfg")
diff --git a/clang/utils/perf-training/perf-helper.py b/clang/utils/perf-training/perf-helper.py
--- a/clang/utils/perf-training/perf-helper.py
+++ b/clang/utils/perf-training/perf-helper.py
@@ -69,10 +69,16 @@
 
 def perf(args):
     parser = argparse.ArgumentParser(
-        prog="perf-helper perf", description="perf wrapper for BOLT profile collection"
+        prog="perf-helper perf",
+        description="perf wrapper for BOLT/CSSPGO profile collection"
     )
     parser.add_argument(
-        "--lbr", required=False, action="store_true", help="Use perf with branch stacks"
+        "--lbr", required=False, action="store_true",
+        help="Use perf with branch stacks"
+    )
+    parser.add_argument(
+        "--call-graph", required=False, action="store_true",
+        help="Collect call graph"
     )
     parser.add_argument("cmd", nargs="*", help="")
 
@@ -97,6 +103,8 @@
     )
     if opts.lbr:
         perf_args += ["--branch-filter=any,u"]
+    if opts.call_graph:
+        perf_args += ["--call-graph=fp"]
     perf_args.extend(cmd)
 
     start_time = time.time()
@@ -132,6 +140,26 @@
     return 0
 
 
+def perf2prof(args):
+    parser = argparse.ArgumentParser(
+            prog="perf-helper perf2prof",
+            description="perf to CSSPGO prof conversion wrapper",
+            )
+    parser.add_argument("profgen", help="Path to llvm-profgen binary")
+    parser.add_argument("binary", help="Input binary")
+    parser.add_argument("path", help="Path containing perf.data files")
+    opts = parser.parse_args(args)
+
+    perf_args = shlex.split("perf script -F ip,brstack --show-mmap-event -i")
+    profgen_args = [opts.profgen, "--format=text", f"--binary={opts.binary}"]
+    for filename in findFilesWithExtension(opts.path, "perf.data"):
+        perfscript = f"{filename}.perfscript"
+        profraw = f"{filename}.profraw"
+        subprocess.check_call(perf_args + [filename, "-o", perfscript])
+        subprocess.check_call(profgen_args + [f"--perfscript={perfscript}", f"--output={profraw}"])
+    return 0
+
+
 def dtrace(args):
     parser = argparse.ArgumentParser(
         prog="perf-helper dtrace",
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -849,6 +849,9 @@
 set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
   "Profiling data file to use when compiling in order to improve runtime performance.")
 
+set(LLVM_SPROFDATA_FILE "" CACHE FILEPATH
+  "Sampling profiling data file to use when compiling in order to improve runtime performance.")
+
 if(LLVM_INCLUDE_TESTS)
   # Lit test suite requires at least python 3.6
   set(LLVM_MINIMUM_PYTHON_VERSION 3.6)
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -1071,7 +1071,7 @@
 option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off)
 mark_as_advanced(LLVM_ENABLE_IR_PGO)
 
-set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend")
+set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR, Frontend, CSIR, CSSPGO")
 set(LLVM_VP_COUNTERS_PER_SITE "1.5" CACHE STRING "Value profile counters to use per site for IR PGO with Clang")
 mark_as_advanced(LLVM_BUILD_INSTRUMENTED LLVM_VP_COUNTERS_PER_SITE)
 string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
@@ -1104,6 +1104,15 @@
         CMAKE_EXE_LINKER_FLAGS
         CMAKE_SHARED_LINKER_FLAGS)
     endif()
+  elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSSPGO")
+    append("-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fno-optimize-sibling-calls -fpseudo-probe-for-profiling"
+      CMAKE_CXX_FLAGS
+      CMAKE_C_FLAGS)
+    if(NOT LINKER_IS_LLD_LINK)
+      append("-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fno-optimize-sibling-calls -fpseudo-probe-for-profiling"
+        CMAKE_EXE_LINKER_FLAGS
+        CMAKE_SHARED_LINKER_FLAGS)
+    endif()
   else()
     append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\""
       CMAKE_CXX_FLAGS
@@ -1154,6 +1163,21 @@
   endif()
 endif()
 
+if(LLVM_SPROFDATA_FILE AND EXISTS ${LLVM_SPROFDATA_FILE})
+  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
+    append("-fpseudo-probe-for-profiling -fprofile-sample-use=\"${LLVM_SPROFDATA_FILE}\""
+      CMAKE_CXX_FLAGS
+      CMAKE_C_FLAGS)
+    if(NOT LINKER_IS_LLD_LINK)
+      append("-fpseudo-probe-for-profiling -fprofile-sample-use=\"${LLVM_SPROFDATA_FILE}\""
+        CMAKE_EXE_LINKER_FLAGS
+        CMAKE_SHARED_LINKER_FLAGS)
+    endif()
+  else()
+    message(FATAL_ERROR "LLVM_SPROFDATA_FILE can only be specified when compiling with clang")
+  endif()
+endif()
+
 option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off)
 mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE)
 append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping"