Fix [Not supported] status for get_compute_process_info_by_pid

On some systems [rocm-smi --showpids] reports
get_compute_process_info_by_pid, Not supported on the given system
[PID] [PROCESS NAME] 1 UNKNOWN UNKNOWN UNKNOWN

get_compute_process_info_by_pid fails because cu_occupancy debugfs method
is not provided on some graphics cards and GFX revisions by design

Proposing a change to return success status when only cu_occupancy debugfs method
is not found and provide cu_occupancy invalidation value to mark only
this parameter as UNKNOWN

Change-Id: Iae37070d9bd19483b4e6c8ee24c7d9a4c92f00d7
Signed-off-by: Vladimir Stempen <Vladimir.Stempen@amd.com>
Reviewed-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

include/rocm_smi/rocm_smi.h

@@ -1134,6 +1134,8 @@ typedef struct {
     uint32_t cu_occupancy;    //!< Compute Unit usage in percent
 } rsmi_process_info_t;
 
+//! CU occupancy invalidation value for the GFX revisions not providing cu_occupancy debugfs method 
+#define CU_OCCUPANCY_INVALID 0xFFFFFFFF
 
 /**
  * @brief Opaque handle to function-support object

python_smi_tools/rocm_smi.py

@@ -2476,6 +2476,7 @@ def showPids(verbose):
         vramUsage = 'UNKNOWN'
         sdmaUsage = 'UNKNOWN'
         cuOccupancy = 'UNKNOWN'
+        cuOccupancyInvalid = 0xFFFFFFFF
         dv_indices = (c_uint32 * num_devices.value)()
         ret = rocmsmi.rsmi_compute_process_gpus_get(int(pid), None, byref(num_devices))
         if rsmi_ret_ok(ret, metric='get_gpu_compute_process'):
@@ -2491,7 +2492,8 @@ def showPids(verbose):
                 if rsmi_ret_ok(ret, metric='get_compute_process_info_by_pid'):
                     vramUsage = proc.vram_usage
                     sdmaUsage = proc.sdma_usage
-                    cuOccupancy = proc.cu_occupancy
+                    if proc.cu_occupancy != cuOccupancyInvalid:
+                        cuOccupancy = proc.cu_occupancy
                 else:
                     logging.debug('Unable to fetch process info by PID')
                 dataArray.append([pid, getProcessName(pid), str(gpuNumber), str(vramUsage), str(sdmaUsage), str(cuOccupancy)])
@@ -2500,7 +2502,8 @@ def showPids(verbose):
             if rsmi_ret_ok(ret, metric='get_compute_process_info_by_pid'):
                 vramUsage = proc.vram_usage
                 sdmaUsage = proc.sdma_usage
-                cuOccupancy = proc.cu_occupancy
+                if proc.cu_occupancy != cuOccupancyInvalid:
+                    cuOccupancy = proc.cu_occupancy
             else:
                 logging.debug('Unable to fetch process info by PID')
             dataArray.append([pid, getProcessName(pid), str(gpuNumber), str(vramUsage), str(sdmaUsage), str(cuOccupancy)])

src/rocm_smi_kfd.cc

@@ -507,7 +507,9 @@ int GetProcessInfoForPID(uint32_t pid, rsmi_process_info_t *proc,
       // Collect count of compute units
       cu_count += kfd_node_map[gpu_id]->cu_count();
     } else {
-      return err;
+      //Some GFX revisions do not provide cu_occupancy debugfs method 
+      proc->cu_occupancy = CU_OCCUPANCY_INVALID;
+      cu_count = 0;
     }
   }