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s390/ap: introduce new AP bus sysfs attribute features

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Introduce a new AP bus sysfs attribute /sys/bus/ap/features
which shows the features from the QCI information.
Currently these feature bits are evaluated:

- QCI S bit is shown as 'APSC'
- QCI N bit is shown as 'APXA'
- QCI C bit is shown as 'QACT'
- QCI R bit is shown as 'RC8A'
- QCI B bit is shown as 'APSB'

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2022-09-20 15:18:39 +02:00 committed by Heiko Carstens
parent f604704021
commit d7b1813af6
1 changed files with 26 additions and 0 deletions
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26
drivers/s390/crypto/ap_bus.c
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@ -1557,6 +1557,31 @@ static ssize_t bindings_show(struct bus_type *bus, char *buf)
static BUS_ATTR_RO(bindings);
static ssize_t features_show(struct bus_type *bus, char *buf)
{
int n = 0;
if (!ap_qci_info) /* QCI not supported */
return sysfs_emit(buf, "-\n");
if (ap_qci_info->apsc)
n += sysfs_emit_at(buf, n, "APSC ");
if (ap_qci_info->apxa)
n += sysfs_emit_at(buf, n, "APXA ");
if (ap_qci_info->qact)
n += sysfs_emit_at(buf, n, "QACT ");
if (ap_qci_info->rc8a)
n += sysfs_emit_at(buf, n, "RC8A ");
if (ap_qci_info->apsb)
n += sysfs_emit_at(buf, n, "APSB ");
sysfs_emit_at(buf, n == 0 ? 0 : n - 1, "\n");
return n;
}
static BUS_ATTR_RO(features);
static struct attribute *ap_bus_attrs[] = {
&bus_attr_ap_domain.attr,
&bus_attr_ap_control_domain_mask.attr,
@ -1572,6 +1597,7 @@ static struct attribute *ap_bus_attrs[] = {
&bus_attr_aqmask.attr,
&bus_attr_scans.attr,
&bus_attr_bindings.attr,
&bus_attr_features.attr,
NULL,
};
ATTRIBUTE_GROUPS(ap_bus);