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: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Farhan Ali <alifm@linux.ibm.com>
Tested-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <20180925231641.4954-10-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index a6c08cd2ed0f47e241e546daeeed3d94bfda1e5f..3834624dcc2eb26e87bce42c64b6a4599a1450df 100644 (file)
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -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,
 };