cxl: Move QoS class to be calculated from the nearest CPU

Retrieve the qos_class (QTG ID) using the access coordinates from the
nearest CPU rather than the nearst initiator that may not be a CPU.
This may be the more appropriate number that applications care about.

For most cases, access0 and access1 have the same values.

Link: https://lore.kernel.org/linux-cxl/[email protected]/
Suggested-by: Jonathan Cameron <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Tested-by: Jonathan Cameron <[email protected]>
Signed-off-by: Dave Jiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Williams <[email protected]>

Author: davejiang

drivers/cxl/core/cdat.c

@@ -198,12 +198,12 @@ static int cxl_port_perf_data_calculate(struct cxl_port *port,
 		 * coordinates in order to allow calculation of access class
 		 * 0 and 1 for region later.
 		 */
-		cxl_coordinates_combine(&coord[ACCESS_COORDINATE_LOCAL],
-					&coord[ACCESS_COORDINATE_LOCAL],
+		cxl_coordinates_combine(&coord[ACCESS_COORDINATE_CPU],
+					&coord[ACCESS_COORDINATE_CPU],
 					&dent->coord);
 		dent->entries = 1;
 		rc = cxl_root->ops->qos_class(cxl_root,
-					      &coord[ACCESS_COORDINATE_LOCAL],
+					      &coord[ACCESS_COORDINATE_CPU],
 					      1, &qos_class);
 		if (rc != 1)
 			continue;