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Commit 81b2b4b7 authored by Tony Krowiak's avatar Tony Krowiak Committed by Christian Borntraeger
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s390: vfio-ap: sysfs interface to view matrix mdev matrix 



Provides a sysfs interface to view the AP matrix configured for the
mediated matrix device.

The relevant sysfs structures are:

/sys/devices/vfio_ap/matrix/
...... [mdev_supported_types]
......... [vfio_ap-passthrough]
............ [devices]
...............[$uuid]
.................. matrix

To view the matrix configured for the mediated matrix device,
print the matrix file:

	cat matrix

Below are examples of the output from the above command:

Example 1: Adapters and domains assigned
	Assignments:
		Adapters 5 and 6
		Domains 4 and 71 (0x47)

	Output
		05.0004
		05.0047
		06.0004
	06.0047

Examples 2: Only adapters assigned
	Assignments:
		Adapters 5 and 6

	Output:
		05.
		06.

Examples 3: Only domains assigned
	Assignments:
		Domains 4 and 71 (0x47)

	Output:
		.0004
		.0047

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarHalil Pasic <pasic@linux.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Tested-by: default avatarMichael Mueller <mimu@linux.ibm.com>
Tested-by: default avatarFarhan Ali <alifm@linux.ibm.com>
Tested-by: default avatarPierre Morel <pmorel@linux.ibm.com>
Message-Id: <20180925231641.4954-10-akrowiak@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 3b1eab7f

drivers/s390/crypto/vfio_ap_ops.c

+51 −0
Original line number Diff line number Diff line
@@ -625,6 +625,56 @@ static ssize_t control_domains_show(struct device *dev, 
}

DEVICE_ATTR_RO(control_domains);



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

			   char *buf)

{

	struct mdev_device *mdev = mdev_from_dev(dev);

	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

	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;

	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->lock);



	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,

					     naqm_bits) {

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

					    apqi);

				bufpos += n;

				nchars += n;

			}

		}

	} else if (apid1 < napm_bits) {

		for_each_set_bit_inv(apid, matrix_mdev->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) {

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

			bufpos += n;

			nchars += n;

		}

	}



	mutex_unlock(&matrix_dev->lock);



	return nchars;

}

DEVICE_ATTR_RO(matrix);



static struct attribute *vfio_ap_mdev_attrs[] = {

	&dev_attr_assign_adapter.attr,

	&dev_attr_unassign_adapter.attr,
@@ -633,6 +683,7 @@ static struct attribute *vfio_ap_mdev_attrs[] = { 
	&dev_attr_assign_control_domain.attr,

	&dev_attr_unassign_control_domain.attr,

	&dev_attr_control_domains.attr,

	&dev_attr_matrix.attr,

	NULL,

};