[Proton] Rename knobs.proton.cupti_path to knobs.proton.cupti_dir to make clear that it should be the parent directory to .so file (#7155)

Other knobs with PATH seem to allow referencing the library directly.
This name update clarifies that it must be the parent directory.

Author: njriasan

python/triton/knobs.py

@@ -450,7 +450,7 @@ class amd_knobs(base_knobs):
 
 
 class proton_knobs(base_knobs):
-    cupti_path: env_opt_str = env_opt_str("TRITON_CUPTI_LIB_PATH")
+    cupti_dir: env_opt_str = env_opt_str("TRITON_CUPTI_LIB_PATH")
 
 
 build = build_knobs()

third_party/proton/proton/profile.py

@@ -26,7 +26,7 @@ def _get_backend_default_path(backend: str) -> str:
     lib_path = ""
     if backend == "cupti":
         # First try to get the path from the environment variable that overrides the default path
-        lib_path = knobs.proton.cupti_path
+        lib_path = knobs.proton.cupti_dir
         if lib_path is None:
             # Get the default path for the cupti backend,
             # which is the most compatible with the current CUPTI header file triton is compiled with