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vmm: Factorize retrieval of PCI resources

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Create a dedicated function for getting the PCI segment, b/d/f and
optional resources. This is meant for handling the potential case of a
restore.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-04-07 16:33:22 +02:00
parent 6e084572d4
commit 0f12fe9b3b
1 changed files with 34 additions and 24 deletions
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58
vmm/src/device_manager.rs
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@ -3423,30 +3423,8 @@ impl DeviceManager {
let mut node = device_node!(id);
node.children = vec![virtio_device_id.clone()];
// Look for the id in the device tree. If it can be found, that means
// the device is being restored, otherwise it's created from scratch.
let (pci_segment_id, pci_device_bdf, resources) = if let Some(node) =
self.device_tree.lock().unwrap().get(&id)
{
info!("Restoring virtio-pci {} resources", id);
let pci_device_bdf: PciBdf = node
.pci_bdf
.ok_or(DeviceManagerError::MissingDeviceNodePciBdf)?;
let pci_segment_id = pci_device_bdf.segment();
self.pci_segments[pci_segment_id as usize]
.pci_bus
.lock()
.unwrap()
.get_device_id(pci_device_bdf.device() as usize)
.map_err(DeviceManagerError::GetPciDeviceId)?;
(pci_segment_id, pci_device_bdf, Some(node.resources.clone()))
} else {
let pci_device_bdf = self.pci_segments[pci_segment_id as usize].next_device_bdf()?;
(pci_segment_id, pci_device_bdf, None)
};
let (pci_segment_id, pci_device_bdf, resources) =
self.pci_resources(&id, pci_segment_id)?;
// Update the existing virtio node by setting the parent.
if let Some(node) = self.device_tree.lock().unwrap().get_mut(&virtio_device_id) {
@ -3572,6 +3550,38 @@ impl DeviceManager {
Ok(pci_device_bdf)
}
fn pci_resources(
&self,
id: &str,
pci_segment_id: u16,
) -> DeviceManagerResult<(u16, PciBdf, Option<Vec<Resource>>)> {
// Look for the id in the device tree. If it can be found, that means
// the device is being restored, otherwise it's created from scratch.
Ok(
if let Some(node) = self.device_tree.lock().unwrap().get(id) {
info!("Restoring virtio-pci {} resources", id);
let pci_device_bdf: PciBdf = node
.pci_bdf
.ok_or(DeviceManagerError::MissingDeviceNodePciBdf)?;
let pci_segment_id = pci_device_bdf.segment();
self.pci_segments[pci_segment_id as usize]
.pci_bus
.lock()
.unwrap()
.get_device_id(pci_device_bdf.device() as usize)
.map_err(DeviceManagerError::GetPciDeviceId)?;
(pci_segment_id, pci_device_bdf, Some(node.resources.clone()))
} else {
let pci_device_bdf =
self.pci_segments[pci_segment_id as usize].next_device_bdf()?;
(pci_segment_id, pci_device_bdf, None)
},
)
}
#[cfg(target_arch = "x86_64")]
pub fn io_bus(&self) -> &Arc<Bus> {
&self.address_manager.io_bus