Introduce RSMI_DEBUG_INFINITE_LOOP

The environment variable RSMI_DEBUG_INFINITE_LOOP is introduced
to facilitate debugging RSMI in user applications. When this
env. variable is non-zero, an infinite loop will be entered in
rsmi_init(). At this point, a debugger can be attached and RSMI
can be debugger. This only applies to debug builds.

Change-Id: I23f6dd730fc965764295070de053314a1cc5b6aa

include/rocm_smi/rocm_smi_common.h

@@ -143,6 +143,13 @@ struct rsmi_func_id_iter_handle {
 };
 
 struct RocmSMI_env_vars {
+    // If RSMI_DEBUG_INFINITE_LOOP is non-zero, rsmi_init() will go into
+    // an infinite loop in debug builds. For release builds, this is
+    // ignored. This is useful for debugging RSMI applications with
+    // gdb. After attaching with gdb, the inf. loop can be exited and
+    // RSMI can be debugged.
+    uint32_t debug_inf_loop;
+
     // Bitfield that is AND'd with various RSMI_DEBUG_* bits to determine
     // which debugging information should be turned on. Env. variable
     // RSMI_DEBUG_BITFIELD is used to set all the debug info bits.