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pci: Allow PCI bus subtypes to support extended config space accesses

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Some PHB implementations, eg. PAPR used on pseries machine, act like
a regular PCI bus rather than a PCIe bus, but allow access to the
PCIe extended config space anyway.

Introduce a new PCI bus class method to modelize this behaviour and
use it when adjusting the config space size limit during accesses.

No behaviour change for existing PCI bus types.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <155414130271.574858.4253514266378127489.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2019-04-01 19:55:02 +02:00 • committed by David Gibson
parent 5263724b78
commit 1c685a9026
4 changed files with 28 additions and 1 deletions
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2
hw/pci/pci_host.c
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@ -54,7 +54,7 @@ static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
static void pci_adjust_config_limit(PCIBus *bus, uint32_t *limit)
{
if (*limit > PCI_CONFIG_SPACE_SIZE) {
if (!pci_bus_is_express(bus)) {
if (!pci_bus_allows_extended_config_space(bus)) {
*limit = PCI_CONFIG_SPACE_SIZE;
return;
}