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pcie: Mangle types to match topology

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Windows will fail to start drivers for devices with an Endpoint type
PCIe capability attached to a Root Complex (code 10 - Device cannot
start).  The proper type for such a device is Root Complex Integrated
Endpoint.  Devices don't care which they are, so do this conversion
automatically.

This allows the Windows driver to load for nec-usb-xhci when attached
to pcie.0 of a q35 machine.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2013-03-14 16:01:35 -06:00 committed by Michael S. Tsirkin
parent 0889464a50
commit eb28cb1bb0
1 changed files with 13 additions and 0 deletions
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13
hw/pci/pcie.c
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@ -48,6 +48,19 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port)
assert(pci_is_express(dev));
/*
* Mangle type to convert Endpoints to Root Complex Integrated Endpoints.
* Windows will report Code 10 (device cannot start) for regular Endpoints
* on the Root Complex.
*/
if (pci_bus_is_express(dev->bus) && pci_bus_is_root(dev->bus)) {
switch (type) {
case PCI_EXP_TYPE_ENDPOINT:
type = PCI_EXP_TYPE_RC_END;
break;
}
}
pos = pci_add_capability(dev, PCI_CAP_ID_EXP, offset,
PCI_EXP_VER2_SIZEOF);
if (pos < 0) {