add comments.

Signed-off-by: rehana begam <[email protected]>

Author: rbegam

sycl/plugins/level_zero/pi_level_zero.cpp

@@ -1588,7 +1588,7 @@ pi_result _pi_platform::populateDeviceCacheIfNeeded() {
         }
 
         // Create PI sub-sub-devices with the sub-device for all the ordinals.
-        // A {sub-device, ordinal} points to a specific CCS which constructs
+        // Each {ordinal, index} points to a specific CCS which constructs
         // a sub-sub-device at this point.
         for (uint32_t J = 0; J < Ordinals.size(); ++J) {
           for (uint32_t K = 0; K < QueueProperties[Ordinals[J]].numQueues;

sycl/plugins/level_zero/pi_level_zero.hpp

@@ -302,8 +302,9 @@ struct _pi_device : _pi_object {
   bool hasCopyEngine() const { return ZeCopyQueueGroupIndex >= 0; }
 
   // Initialize the entire PI device.
-  // Optional param `SubSubDeviceOrdinal` is the compute command queue index
-  // used to initialize sub-sub-devices.
+  // Optional param `SubSubDeviceOrdinal` `SubSubDeviceIndex` are the compute
+  // command queue ordinal and index respectively, used to initialize
+  // sub-sub-devices.
   pi_result initialize(int SubSubDeviceOrdinal = -1,
                        int SubSubDeviceIndex = -1);