Commit e12aa0b5 authored by Jason J. Herne's avatar Jason J. Herne Committed by Alexander Gordeev
Browse files

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: default avatar"Jason J. Herne" <jjherne@linux.ibm.com>
Reviewed-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Tested-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20240415152555.13152-3-jjherne@linux.ibm.com


Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent 6e697394

drivers/s390/crypto/vfio_ap_ops.c

+27 −0
Original line number Diff line number Diff line
@@ -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,