Commit f7f795c5 authored by Tony Krowiak's avatar Tony Krowiak Committed by Alexander Gordeev
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s390/vfio-ap: sysfs attribute to display the guest's matrix 



The matrix of adapters and domains configured in a guest's APCB may
differ from the matrix of adapters and domains assigned to the matrix mdev,
so this patch introduces a sysfs attribute to display the matrix of
adapters and domains that are or will be assigned to the APCB of a guest
that is or will be using the matrix mdev. For a matrix mdev denoted by
$uuid, the guest matrix can be displayed as follows:

   cat /sys/devices/vfio_ap/matrix/$uuid/guest_matrix

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarJason J. Herne <jjherne@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent 3f85d1df

drivers/s390/crypto/vfio_ap_ops.c

+35 −13
Original line number Diff line number Diff line
@@ -1427,28 +1427,24 @@ static ssize_t control_domains_show(struct device *dev, 
}

static DEVICE_ATTR_RO(control_domains);



static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,

			   char *buf)

static ssize_t vfio_ap_mdev_matrix_show(struct ap_matrix *matrix, char *buf)

{

	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);

	char *bufpos = buf;

	unsigned long apid;

	unsigned long apqi;

	unsigned long apid1;

	unsigned long apqi1;

	unsigned long napm_bits = matrix_mdev->matrix.apm_max + 1;

	unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;

	unsigned long napm_bits = matrix->apm_max + 1;

	unsigned long naqm_bits = matrix->aqm_max + 1;

	int nchars = 0;

	int n;



	apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);

	apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);



	mutex_lock(&matrix_dev->mdevs_lock);

	apid1 = find_first_bit_inv(matrix->apm, napm_bits);

	apqi1 = find_first_bit_inv(matrix->aqm, naqm_bits);



	if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {

		for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {

			for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,

		for_each_set_bit_inv(apid, matrix->apm, napm_bits) {

			for_each_set_bit_inv(apqi, matrix->aqm,

					     naqm_bits) {

				n = sprintf(bufpos, "%02lx.%04lx\n", apid,

					    apqi);
@@ -1457,25 +1453,50 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr, 
			}

		}

	} else if (apid1 < napm_bits) {

		for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {

		for_each_set_bit_inv(apid, matrix->apm, napm_bits) {

			n = sprintf(bufpos, "%02lx.\n", apid);

			bufpos += n;

			nchars += n;

		}

	} else if (apqi1 < naqm_bits) {

		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm_bits) {

		for_each_set_bit_inv(apqi, matrix->aqm, naqm_bits) {

			n = sprintf(bufpos, ".%04lx\n", apqi);

			bufpos += n;

			nchars += n;

		}

	}



	return nchars;

}



static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,

			   char *buf)

{

	ssize_t nchars;

	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);



	mutex_lock(&matrix_dev->mdevs_lock);

	nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->matrix, buf);

	mutex_unlock(&matrix_dev->mdevs_lock);



	return nchars;

}

static DEVICE_ATTR_RO(matrix);



static ssize_t guest_matrix_show(struct device *dev,

				 struct device_attribute *attr, char *buf)

{

	ssize_t nchars;

	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);



	mutex_lock(&matrix_dev->mdevs_lock);

	nchars = vfio_ap_mdev_matrix_show(&matrix_mdev->shadow_apcb, buf);

	mutex_unlock(&matrix_dev->mdevs_lock);



	return nchars;

}

static DEVICE_ATTR_RO(guest_matrix);



static struct attribute *vfio_ap_mdev_attrs[] = {

	&dev_attr_assign_adapter.attr,

	&dev_attr_unassign_adapter.attr,
@@ -1485,6 +1506,7 @@ static struct attribute *vfio_ap_mdev_attrs[] = { 
	&dev_attr_unassign_control_domain.attr,

	&dev_attr_control_domains.attr,

	&dev_attr_matrix.attr,

	&dev_attr_guest_matrix.attr,

	NULL,

};