s390/vfio-ap: Add sysfs attr, ap_config, to export mdev state

Add ap_config sysfs attribute. This will provide the means for
setting or displaying the adapters, domains and control domains assigned
to the vfio-ap mediated device in a single operation. This sysfs
attribute is comprised of three masks: One for adapters, one for domains,
and one for control domains.

This attribute is intended to be used by mdevctl to query a vfio-ap
mediated device's state.

Signed-off-by: "Jason J. Herne" <jjherne@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20240415152555.13152-3-jjherne@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index fc169bc61593955525368f56f5eb1bf3caa414b7..e01f53a3c5b77668c58c0e641f406480d11c712b 100644 (file)
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1570,6 +1570,32 @@ static ssize_t guest_matrix_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(guest_matrix);
 
+static ssize_t write_ap_bitmap(unsigned long *bitmap, char *buf, int offset, char sep)
+{
+       return sysfs_emit_at(buf, offset, "0x%016lx%016lx%016lx%016lx%c",
+                        bitmap[0], bitmap[1], bitmap[2], bitmap[3], sep);
+}
+
+static ssize_t ap_config_show(struct device *dev, struct device_attribute *attr,
+                             char *buf)
+{
+       struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
+       int idx = 0;
+
+       idx += write_ap_bitmap(matrix_mdev->matrix.apm, buf, idx, ',');
+       idx += write_ap_bitmap(matrix_mdev->matrix.aqm, buf, idx, ',');
+       idx += write_ap_bitmap(matrix_mdev->matrix.adm, buf, idx, '\n');
+
+       return idx;
+}
+
+static ssize_t ap_config_store(struct device *dev, struct device_attribute *attr,
+                              const char *buf, size_t count)
+{
+       return count;
+}
+static DEVICE_ATTR_RW(ap_config);
+
 static struct attribute *vfio_ap_mdev_attrs[] = {
        &dev_attr_assign_adapter.attr,
        &dev_attr_unassign_adapter.attr,
@@ -1577,6 +1603,7 @@ static struct attribute *vfio_ap_mdev_attrs[] = {
        &dev_attr_unassign_domain.attr,
        &dev_attr_assign_control_domain.attr,
        &dev_attr_unassign_control_domain.attr,
+       &dev_attr_ap_config.attr,
        &dev_attr_control_domains.attr,
        &dev_attr_matrix.attr,
        &dev_attr_guest_matrix.attr,