s390x/css: device support for s390-ccw passthrough

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.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170517004813.58227-7-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Dong Jia Shi 2017-05-17 02:48:06 +02:00 committed by Cornelia Huck
parent 817d4a6bc8
commit a8eac9431a
3 changed files with 180 additions and 0 deletions

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@ -14,3 +14,4 @@ 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

141
hw/s390x/s390-ccw.c Normal file
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@ -0,0 +1,141 @@
/*
* 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 "hw/s390x/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));
if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
error_setg_errno(errp, errno, "Failed to read %s", tmp);
return;
}
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)

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@ -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