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s390x/pci: Move some hotplug checks to the pre_plug handler 

Let's move most of the checks to the new pre_plug handler. As a PCI
bridge is just a PCI device, we can simplify the code.

Notes: We cannot yet move the MSIX check or device ID creation +
zPCI device creation to the pre_plug handler as both parts are not
fixed before actual device realization (and therefore after pre_plug and
before plug). Once that part is factored out, we can move these parts to
the pre_plug handler, too and therefore remove all possible errors from
the plug handler.

Reviewed-by: Collin Walling <walling@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190114103110.10909-3-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-01-14 11:31:06 +01:00 committed by Cornelia Huck
parent 19375e9be0
commit 6069bcdeac
1 changed files with 25 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
hw/s390x/s390-pci-bus.c
View File

@ -818,11 +818,31 @@ static bool s390_pci_alloc_idx(S390pciState *s, S390PCIBusDevice *pbdev)
}
pbdev->idx = idx;
s->next_idx = (idx + 1) & FH_MASK_INDEX;
return true;
}
static void s390_pcihost_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev);
if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
PCIDevice *pdev = PCI_DEVICE(dev);
if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
error_setg(errp, "multifunction not supported in s390");
return;
}
} else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) {
S390PCIBusDevice *pbdev = S390_PCI_DEVICE(dev);
if (!s390_pci_alloc_idx(s, pbdev)) {
error_setg(errp, "no slot for plugging zpci device");
return;
}
}
}
static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
@ -835,11 +855,6 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
PCIBridge *pb = PCI_BRIDGE(dev);
PCIDevice *pdev = PCI_DEVICE(dev);
if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
error_setg(errp, "multifunction not supported in s390");
return;
}
pci_bridge_map_irq(pb, dev->id, s390_pci_map_irq);
pci_setup_iommu(&pb->sec_bus, s390_pci_dma_iommu, s);
@ -859,11 +874,6 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
} else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
pdev = PCI_DEVICE(dev);
if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
error_setg(errp, "multifunction not supported in s390");
return;
}
if (!dev->id) {
/* In the case the PCI device does not define an id */
/* we generate one based on the PCI address */
@ -905,10 +915,8 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
} else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) {
pbdev = S390_PCI_DEVICE(dev);
if (!s390_pci_alloc_idx(s, pbdev)) {
error_setg(errp, "no slot for plugging zpci device");
return;
}
/* the allocated idx is actually getting used */
s->next_idx = (pbdev->idx + 1) & FH_MASK_INDEX;
pbdev->fh = pbdev->idx;
QTAILQ_INSERT_TAIL(&s->zpci_devs, pbdev, link);
g_hash_table_insert(s->zpci_table, &pbdev->idx, pbdev);
@ -1045,6 +1053,7 @@ static void s390_pcihost_class_init(ObjectClass *klass, void *data)
dc->reset = s390_pcihost_reset;
dc->realize = s390_pcihost_realize;
hc->pre_plug = s390_pcihost_pre_plug;
hc->plug = s390_pcihost_plug;
hc->unplug = s390_pcihost_unplug;
msi_nonbroken = true;