[RFC 03/19] s390/zcrypt: new AP matrix bus

Tony Krowiak
2017-10-13T17:38:48Z

Introduces an AP matrix bus. The sysfs location of the
AP matrix bus is:

/sys/bus/ap_matrix

The AP matrix bus will create an AP matrix device that will
hold the AP queues reserved for use by KVM guests.

Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
---
MAINTAINERS | 8 +++++
drivers/s390/crypto/Makefile | 4 +-
drivers/s390/crypto/ap_matrix_bus.c | 52 +++++++++++++++++++++++++++++++++++
drivers/s390/crypto/ap_matrix_bus.h | 15 ++++++++++
4 files changed, 77 insertions(+), 2 deletions(-)
create mode 100644 drivers/s390/crypto/ap_matrix_bus.c
create mode 100644 drivers/s390/crypto/ap_matrix_bus.h

diff --git a/MAINTAINERS b/MAINTAINERS
index ef23cf5..cbd6f7c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11711,6 +11711,14 @@ W: http://www.ibm.com/developerworks/linux/linux390/
S: Supported
F: drivers/s390/crypto/

+S390 VFIO AP MATRIX DRIVER
+M: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
+L: linux-s390@vger.kernel.org
+W: http://www.ibm.com/developerworks/linux/linux390/
+S: Supported
+F: drivers/s390/crypto/ap_matrix_bus.h
+F: drivers/s390/crypto/ap_matrix_bus.c
+
S390 ZFCP DRIVER
M: Steffen Maier <maier@linux.vnet.ibm.com>
M: Benjamin Block <bblock@linux.vnet.ibm.com>
diff --git a/drivers/s390/crypto/Makefile b/drivers/s390/crypto/Makefile
index be36f10..87646ca 100644
--- a/drivers/s390/crypto/Makefile
+++ b/drivers/s390/crypto/Makefile
@@ -2,7 +2,7 @@
# S/390 crypto devices
#

-ap-objs := ap_bus.o ap_card.o ap_queue.o
+ap-objs := ap_bus.o ap_card.o ap_queue.o ap_matrix_bus.o
obj-$(subst m,y,$(CONFIG_ZCRYPT)) += ap.o
# zcrypt_api.o and zcrypt_msgtype*.o depend on ap.o
zcrypt-objs := zcrypt_api.o zcrypt_card.o zcrypt_queue.o
@@ -13,4 +13,4 @@ obj-$(CONFIG_ZCRYPT) += zcrypt_pcixcc.o zcrypt_cex2a.o zcrypt_cex4.o

# pkey kernel module
pkey-objs := pkey_api.o
-obj-$(CONFIG_PKEY) += pkey.o
+obj-$(CONFIG_PKEY) += pkey.o
\ No newline at end of file
diff --git a/drivers/s390/crypto/ap_matrix_bus.c b/drivers/s390/crypto/ap_matrix_bus.c
new file mode 100644
index 0000000..fbae175
--- /dev/null
+++ b/drivers/s390/crypto/ap_matrix_bus.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright IBM Corp. 2017
+ * Author(s): Tony Krowiak <akrowiak@linux.vnet.ibm.com>
+ *
+ * Adjunct processor matrix bus.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <asm/ap.h>
+
+#include "ap_matrix_bus.h"
+
+MODULE_AUTHOR("Tony Krowiak <akrowiak@linux.vnet.ibm.com");
+MODULE_DESCRIPTION("AP Matrix, Copyright IBM Corp. 2017");
+MODULE_LICENSE("GPL v2");
+
+#define AP_MATRIX_BUS_NAME "ap_matrix"
+
+static struct device *ap_matrix_root_device;
+
+static struct bus_type ap_matrix_bus_type = {
+ .name = AP_MATRIX_BUS_NAME,
+};
+
+int __init ap_matrix_init(void)
+{
+ int ret;
+
+ ap_matrix_root_device = root_device_register(AP_MATRIX_BUS_NAME);
+ ret = PTR_RET(ap_matrix_root_device);
+ if (ret)
+ goto done;
+
+ ret = bus_register(&ap_matrix_bus_type);
+ if (ret)
+ goto bus_reg_err;
+
+ return 0;
+
+bus_reg_err:
+ root_device_unregister(ap_matrix_root_device);
+
+done:
+ return ret;
+}
+device_initcall(ap_matrix_init);
diff --git a/drivers/s390/crypto/ap_matrix_bus.h b/drivers/s390/crypto/ap_matrix_bus.h
new file mode 100644
index 0000000..58e116f
--- /dev/null
+++ b/drivers/s390/crypto/ap_matrix_bus.h
@@ -0,0 +1,15 @@
+/*
+ * Adjunct processor matrix bus header file
+ *
+ * Copyright IBM Corp. 2017
+ * Author(s): Tony Krowiak <akrowiak@linux.vnet.ibm.com>
+ *
+ * Adjunct processor bus header file.
+ */
+
+#ifndef _AP_MATRIX_BUS_H_
+#define _AP_MATRIX_BUS_H_
+
+int ap_matrix_init(void);
+
+#endif /* _AP_MATRIX_BUS_H_ */
--
1.7.1