s390/cio: export measurement data for all CMGs

JIRA: https://issues.redhat.com/browse/RHEL-50790

commit 5e6bb10
Author: Peter Oberparleiter <oberpar@linux.ibm.com>
Date:   Tue Mar 26 17:03:23 2024 +0100

    s390/cio: export measurement data for all CMGs

    A channel-path's channel-measurement-group value (CMG) determines the
    format of associated measurement data and characteristics blocks. Both
    blocks are of fixed size and contain a generic and CMG-dependent part.

    Currently CIO exports these data blocks via sysfs only for a specific
    list of CMGs even though the kernel itself does not interpret
    CMG-dependent data.

    Change CIO to export measurement data and characteristics for all CMGs.
    This enables supporting new CMG data formats in userspace without the
    need for kernel changes.

    Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
    Acked-by: Heiko Carstens <hca@linux.ibm.com>
    Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
    Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

Signed-off-by: Mete Durlu <mdurlu@redhat.com>

Author: Mete Durlu

drivers/s390/cio/chsc.c

@@ -1112,10 +1112,6 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
 	chp->cmg = scmc_area->cmg;
 	chp->shared = scmc_area->shared;
 	chp->extended = scmc_area->extended;
-	if (chp->cmg != 2 && chp->cmg != 3) {
-		/* No cmg-dependent data. */
-		goto out;
-	}
 	chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 				  (struct cmg_chars *) &scmc_area->data);
 out: