[PATCH v6 09/21] s390: vfio-ap: structure for storing mdev matrix

Tony Krowiak
2018-06-29T21:11:11Z

From: Tony Krowiak <akrowiak@linux.ibm.com>

Introduces a new structure for storing the AP matrix configured
for the mediated matrix device via its sysfs attributes files.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 12 ++++++++++++
drivers/s390/crypto/vfio_ap_private.h | 24 ++++++++++++++++++++++++
2 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 4e61e33..bf7ed9f 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -20,6 +20,17 @@
DEFINE_SPINLOCK(mdev_list_lock);
LIST_HEAD(mdev_list);

+static void vfio_ap_matrix_init(struct ap_matrix *matrix)
+{
+ /* Test if PQAP(QCI) instruction is available */
+ if (test_facility(12))
+ ap_qci(&matrix->info);
+
+ matrix->apm_max = matrix->info.apxa ? matrix->info.Na : 63;
+ matrix->aqm_max = matrix->info.apxa ? matrix->info.Nd : 15;
+ matrix->adm_max = matrix->info.apxa ? matrix->info.Nd : 15;
+}
+
static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
{
struct ap_matrix_dev *matrix_dev =
@@ -31,6 +42,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
return -ENOMEM;

matrix_mdev->name = dev_name(mdev_dev(mdev));
+ vfio_ap_matrix_init(&matrix_mdev->matrix);
mdev_set_drvdata(mdev, matrix_mdev);

if (atomic_dec_if_positive(&matrix_dev->available_instances) < 0) {
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 3de1275..ae771f5 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -29,9 +29,33 @@ struct ap_matrix_dev {
atomic_t available_instances;
};

+/**
+ * The AP matrix is comprised of three bit masks identifying the adapters,
+ * queues (domains) and control domains that belong to an AP matrix. The bits i
+ * each mask, from least significant to most significant bit, correspond to IDs
+ * 0 to 255. When a bit is set, the corresponding ID belongs to the matrix.
+ *
+ * @apm identifies the AP adapters in the matrix
+ * @apm_max: max adapter number in @apm
+ * @aqm identifies the AP queues (domains) in the matrix
+ * @aqm_max: max domain number in @aqm
+ * @adm identifies the AP control domains in the matrix
+ * @adm_max: max domain number in @adm
+ */
+struct ap_matrix {
+ unsigned long apm_max;
+ DECLARE_BITMAP(apm, 256);
+ unsigned long aqm_max;
+ DECLARE_BITMAP(aqm, 256);
+ unsigned long adm_max;
+ DECLARE_BITMAP(adm, 256);
+ struct ap_config_info info;
+};
+
struct ap_matrix_mdev {
const char *name;
struct list_head list;
+ struct ap_matrix matrix;
};

static struct ap_matrix_dev *to_ap_matrix_dev(struct device *dev)
--
1.7.1