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hw/pci: Introduce helper function pci_device_get_iommu_bus_devfn()

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Extract out pci_device_get_iommu_bus_devfn() from
pci_device_iommu_address_space() to facilitate
implementation of pci_device_[set|unset]_iommu_device()
in following patch.

No functional change intended.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-06-05 16:30:38 +08:00 committed by Cédric Le Goater
parent a7fd91b876
commit 6c8ed5fea1
1 changed files with 45 additions and 3 deletions
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48
hw/pci/pci.c
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@ -2648,11 +2648,27 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data)
}
}
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
/*
* Get IOMMU root bus, aliased bus and devfn of a PCI device
*
* IOMMU root bus is needed by all call sites to call into iommu_ops.
* For call sites which don't need aliased BDF, passing NULL to
* aliased_[bus|devfn] is allowed.
*
* @piommu_bus: return root #PCIBus backed by an IOMMU for the PCI device.
*
* @aliased_bus: return aliased #PCIBus of the PCI device, optional.
*
* @aliased_devfn: return aliased devfn of the PCI device, optional.
*/
static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
PCIBus **piommu_bus,
PCIBus **aliased_bus,
int *aliased_devfn)
{
PCIBus *bus = pci_get_bus(dev);
PCIBus *iommu_bus = bus;
uint8_t devfn = dev->devfn;
int devfn = dev->devfn;
while (iommu_bus && !iommu_bus->iommu_ops && iommu_bus->parent_dev) {
PCIBus *parent_bus = pci_get_bus(iommu_bus->parent_dev);
@ -2693,7 +2709,33 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
iommu_bus = parent_bus;
}
if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
assert(iommu_bus);
if (pci_bus_bypass_iommu(bus) || !iommu_bus->iommu_ops) {
iommu_bus = NULL;
}
*piommu_bus = iommu_bus;
if (aliased_bus) {
*aliased_bus = bus;
}
if (aliased_devfn) {
*aliased_devfn = devfn;
}
}
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
{
PCIBus *bus;
PCIBus *iommu_bus;
int devfn;
pci_device_get_iommu_bus_devfn(dev, &iommu_bus, &bus, &devfn);
if (iommu_bus) {
return iommu_bus->iommu_ops->get_address_space(bus,
iommu_bus->iommu_opaque, devfn);
}