[PATCH RFC v2 06/12] s390x/css: device support for s390-ccw passthrough

Dong Jia Shi
2017-01-12T07:25:07Z

From: Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>

In order to support subchannels pass-through, we introduce a s390
subchannel device called "s390-ccw" to hold the real subchannel info.
The s390-ccw devices inherit from the abstract CcwDevice which connect
to the existing virtual-css-bus.

Signed-off-by: Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
---
hw/s390x/Makefile.objs | 1 +
hw/s390x/css-bridge.c | 3 ++
hw/s390x/s390-ccw.c | 120 ++++++++++++++++++++++++++++++++++++++++++
hw/s390x/s390-ccw.h | 37 +++++++++++++
include/hw/s390x/css-bridge.h | 1 +
5 files changed, 162 insertions(+)
create mode 100644 hw/s390x/s390-ccw.c
create mode 100644 hw/s390x/s390-ccw.h

diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
index 41ac4ec..72a3d37 100644
--- a/hw/s390x/Makefile.objs
+++ b/hw/s390x/Makefile.objs
@@ -13,3 +13,4 @@ obj-y += ccw-device.o
obj-y += s390-pci-bus.o s390-pci-inst.o
obj-y += s390-skeys.o
obj-$(CONFIG_KVM) += s390-skeys-kvm.o
+obj-y += s390-ccw.o
diff --git a/hw/s390x/css-bridge.c b/hw/s390x/css-bridge.c
index 9a7f7ee..6523242 100644
--- a/hw/s390x/css-bridge.c
+++ b/hw/s390x/css-bridge.c
@@ -17,6 +17,7 @@
#include "hw/s390x/css.h"
#include "ccw-device.h"
#include "hw/s390x/css-bridge.h"
+#include "target-s390x/cpu.h"

/*
* Invoke device-specific unplug handler, disable the subchannel
@@ -104,6 +105,8 @@ VirtualCssBus *virtual_css_bus_init(void)
bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css");
cbus = VIRTUAL_CSS_BUS(bus);

+ cbus->map_vir_css = s390_get_map_css();
+
/* Enable hotplugging */
qbus_set_hotplug_handler(bus, dev, &error_abort);

diff --git a/hw/s390x/s390-ccw.c b/hw/s390x/s390-ccw.c
new file mode 100644
index 0000000..6881fc6
--- /dev/null
+++ b/hw/s390x/s390-ccw.c
@@ -0,0 +1,120 @@
+/*
+ * s390 CCW Assignment Support
+ *
+ * Copyright 2017 IBM Corp
+ * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
+ * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
+ * Pierre Morel <pmorel@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2
+ * or (at your option) any later version. See the COPYING file in the
+ * top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "libgen.h"
+#include "hw/s390x/css.h"
+#include "hw/s390x/css-bridge.h"
+#include "s390-ccw.h"
+
+static void s390_ccw_realize(S390CCWDevice *cdev, Error **errp)
+{
+ CcwDevice *ccw_dev = CCW_DEVICE(cdev);
+ DeviceState *parent = DEVICE(ccw_dev);
+ BusState *qbus;
+ VirtualCssBus *cbus;
+ SubchDev *sch;
+ CssDevId bus_id;
+ int ret;
+
+ if (!cdev->hostid.valid) {
+ error_setg(errp, "Invalid hostid");
+ return;
+ }
+
+ qbus = qdev_get_parent_bus(parent);
+ cbus = VIRTUAL_CSS_BUS(qbus);
+ if (ccw_dev->bus_id.valid) {
+ bus_id = ccw_dev->bus_id;
+
+ if (bus_id.cssid == VIRTUAL_CSSID) {
+ error_setg(errp, "Bad guest id: VIRTUAL_CSSID %x forbidden",
+ bus_id.cssid);
+ return;
+ }
+
+ if (!cbus->map_vir_css) {
+ ret = css_create_css_image(bus_id.cssid, false);
+ if (ret == -EINVAL) {
+ error_setg(errp, "Invalid cssid: %x", bus_id.cssid);
+ return;
+ }
+ }
+ } else {
+ bus_id = cdev->hostid;
+ }
+
+ if (cbus->map_vir_css) {
+ bus_id.cssid = VIRTUAL_CSSID;
+ }
+
+ sch = css_create_sch(bus_id, errp);
+ if (!sch) {
+ return;
+ }
+
+ sch->driver_data = cdev;
+
+ ret = css_sch_build_schib(sch, &cdev->hostid);
+ if (ret) {
+ error_setg(errp, "%s: Failed to build initial schib: %d",
+ __func__, ret);
+ css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
+ g_free(sch);
+ return;
+ }
+ css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
+ parent->hotplugged, 1);
+
+ ccw_dev->sch = sch;
+ return;
+}
+
+static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
+{
+ CcwDevice *ccw_dev = CCW_DEVICE(cdev);
+ SubchDev *sch = ccw_dev->sch;
+
+ if (sch) {
+ css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
+ g_free(sch);
+ ccw_dev->sch = NULL;
+ }
+}
+
+static void s390_ccw_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
+
+ dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
+ cdc->realize = s390_ccw_realize;
+ cdc->unrealize = s390_ccw_unrealize;
+}
+
+static const TypeInfo s390_ccw_info = {
+ .name = TYPE_S390_CCW,
+ .parent = TYPE_CCW_DEVICE,
+ .instance_size = sizeof(S390CCWDevice),
+ .abstract = true,
+ .class_size = sizeof(S390CCWDeviceClass),
+ .class_init = s390_ccw_class_init,
+};
+
+static void register_s390_ccw_type(void)
+{
+ type_register_static(&s390_ccw_info);
+}
+
+type_init(register_s390_ccw_type)
diff --git a/hw/s390x/s390-ccw.h b/hw/s390x/s390-ccw.h
new file mode 100644
index 0000000..9ced8cb
--- /dev/null
+++ b/hw/s390x/s390-ccw.h
@@ -0,0 +1,37 @@
+/*
+ * s390 CCW Assignment Support
+ *
+ * Copyright 2017 IBM Corp.
+ * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
+ * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#ifndef HW_S390_CCW_H
+#define HW_S390_CCW_H
+
+#include "hw/s390x/ccw-device.h"
+
+#define TYPE_S390_CCW "s390-ccw"
+#define S390_CCW_DEVICE(obj) \
+ OBJECT_CHECK(S390CCWDevice, (obj), TYPE_S390_CCW)
+#define S390_CCW_DEVICE_CLASS(klass) \
+ OBJECT_CLASS_CHECK(S390CCWDeviceClass, (klass), TYPE_S390_CCW)
+#define S390_CCW_DEVICE_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(S390CCWDeviceClass, (obj), TYPE_S390_CCW)
+
+typedef struct S390CCWDevice {
+ CcwDevice parent_obj;
+ CssDevId hostid;
+} S390CCWDevice;
+
+typedef struct S390CCWDeviceClass {
+ CCWDeviceClass parent_class;
+ void (*realize)(S390CCWDevice *dev, Error **errp);
+ void (*unrealize)(S390CCWDevice *dev, Error **errp);
+} S390CCWDeviceClass;
+
+#endif
diff --git a/include/hw/s390x/css-bridge.h b/include/hw/s390x/css-bridge.h
index 5a0203b..3fa842b 100644
--- a/include/hw/s390x/css-bridge.h
+++ b/include/hw/s390x/css-bridge.h
@@ -28,6 +28,7 @@ typedef struct VirtualCssBridge {
/* virtual css bus type */
typedef struct VirtualCssBus {
BusState parent_obj;
+ bool map_vir_css;
} VirtualCssBus;

#define TYPE_VIRTUAL_CSS_BUS "virtual-css-bus"
--
2.8.4