[PATCH v7 06/13] s390x/css: device support for s390-ccw passthrough

Dong Jia Shi
2017-05-05T02:03:45Z

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: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
---
hw/s390x/Makefile.objs | 1 +
hw/s390x/s390-ccw.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++
hw/s390x/s390-ccw.h | 38 ++++++++++++++
3 files changed, 177 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/s390-ccw.c b/hw/s390x/s390-ccw.c
new file mode 100644
index 0000000..b1aadcd
--- /dev/null
+++ b/hw/s390x/s390-ccw.c
@@ -0,0 +1,138 @@
+/*
+ * 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_get_dev_info(S390CCWDevice *cdev,
+ char *sysfsdev,
+ Error **errp)
+{
+ unsigned int cssid, ssid, devid;
+ char dev_path[PATH_MAX] = {0}, *tmp;
+
+ if (!sysfsdev) {
+ error_setg(errp, "No host device provided");
+ error_append_hint(errp,
+ "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
+ return;
+ }
+
+ if (!realpath(sysfsdev, dev_path)) {
+ error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
+ return;
+ }
+
+ cdev->mdevid = g_strdup(basename(dev_path));
+
+ tmp = basename(dirname(dev_path));
+ sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid);
+
+ cdev->hostid.cssid = cssid;
+ cdev->hostid.ssid = ssid;
+ cdev->hostid.devid = devid;
+ cdev->hostid.valid = true;
+}
+
+static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
+{
+ CcwDevice *ccw_dev = CCW_DEVICE(cdev);
+ CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
+ DeviceState *parent = DEVICE(ccw_dev);
+ BusState *qbus = qdev_get_parent_bus(parent);
+ VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
+ SubchDev *sch;
+ int ret;
+ Error *err = NULL;
+
+ s390_ccw_get_dev_info(cdev, sysfsdev, &err);
+ if (err) {
+ goto out_err_propagate;
+ }
+
+ sch = css_create_sch(ccw_dev->devno, false, cbus->squash_mcss, &err);
+ if (!sch) {
+ goto out_mdevid_free;
+ }
+ sch->driver_data = cdev;
+
+ ccw_dev->sch = sch;
+ ret = css_sch_build_schib(sch, &cdev->hostid);
+ if (ret) {
+ error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
+ __func__);
+ goto out_err;
+ }
+
+ ck->realize(ccw_dev, &err);
+ if (err) {
+ goto out_err;
+ }
+
+ css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
+ parent->hotplugged, 1);
+ return;
+
+out_err:
+ css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
+ ccw_dev->sch = NULL;
+ g_free(sch);
+out_mdevid_free:
+ g_free(cdev->mdevid);
+out_err_propagate:
+ error_propagate(errp, err);
+}
+
+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;
+ }
+
+ g_free(cdev->mdevid);
+}
+
+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),
+ .class_size = sizeof(S390CCWDeviceClass),
+ .class_init = s390_ccw_class_init,
+ .abstract = true,
+};
+
+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..b58d8e9
--- /dev/null
+++ b/hw/s390x/s390-ccw.h
@@ -0,0 +1,38 @@
+/*
+ * 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;
+ char *mdevid;
+} S390CCWDevice;
+
+typedef struct S390CCWDeviceClass {
+ CCWDeviceClass parent_class;
+ void (*realize)(S390CCWDevice *dev, char *sysfsdev, Error **errp);
+ void (*unrealize)(S390CCWDevice *dev, Error **errp);
+} S390CCWDeviceClass;
+
+#endif
--
2.10.2