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d8d98db5f0
Expose the busids of the virtual I/O subchannel and the virtual CCW
device to ease debugging. This is needed because:
1. subchannel id are assigned dynamically, and cannot be set from
outside.
2. device busid could possibly be auto generated.
An example of using HMP to retrieve the property values of a
virtio-balloon-ccw device looks like:
[root@localhost ~]# lscss -d 0.0.0004
Device Subchan. DevType CU Type Use PIM PAM POM CHPIDs
----------------------------------------------------------------------
0.0.0004 0.0.0003 0000/00 3832/05 yes 80 80 ff 00000000 00000000
(qemu) info qtree
... ...
dev: virtio-balloon-ccw, id "balloon0"
devno = "<unset>"
ioeventfd = true
max_revision = 2 (0x2)
dev_id = "fe.0.0004"
subch_id = "fe.0.0003"
... ...
After migration, if we have the same device that shows up on a
different subchannel, we must re-fill the subch_id of the ccw
device with the new schid, or the subch_id will have an old wrong
schid value. So this also re-fills the subch_id after migration.
While we are at it, also neaten the related error handling a bit.
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* Common device infrastructure for devices in the virtual css
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*
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* Copyright 2016 IBM Corp.
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* Author(s): Jing Liu <liujbjl@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "qemu/osdep.h"
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#include "ccw-device.h"
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static void ccw_device_refill_ids(CcwDevice *dev)
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{
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SubchDev *sch = dev->sch;
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assert(sch);
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dev->dev_id.cssid = sch->cssid;
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dev->dev_id.ssid = sch->ssid;
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dev->dev_id.devid = sch->devno;
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dev->dev_id.valid = true;
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dev->subch_id.cssid = sch->cssid;
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dev->subch_id.ssid = sch->ssid;
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dev->subch_id.devid = sch->schid;
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dev->subch_id.valid = true;
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}
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static void ccw_device_realize(CcwDevice *dev, Error **errp)
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{
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ccw_device_refill_ids(dev);
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}
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static Property ccw_device_properties[] = {
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DEFINE_PROP_CSS_DEV_ID_RO("dev_id", CcwDevice, dev_id),
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DEFINE_PROP_CSS_DEV_ID_RO("subch_id", CcwDevice, subch_id),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void ccw_device_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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CCWDeviceClass *k = CCW_DEVICE_CLASS(klass);
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k->realize = ccw_device_realize;
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k->refill_ids = ccw_device_refill_ids;
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dc->props = ccw_device_properties;
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}
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static const TypeInfo ccw_device_info = {
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.name = TYPE_CCW_DEVICE,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(CcwDevice),
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.class_size = sizeof(CCWDeviceClass),
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.class_init = ccw_device_class_init,
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.abstract = true,
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};
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static void ccw_device_register(void)
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{
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type_register_static(&ccw_device_info);
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}
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type_init(ccw_device_register)
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