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

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Date:   Fri, 29 Jun 2018 17:11:11 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        akrowiak@...ux.vnet.ibm.com, Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: [PATCH v6 09/21] s390: vfio-ap: structure for storing mdev matrix

From: Tony Krowiak <akrowiak@...ux.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@...ux.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