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pci: Allow specific PCI b/d/f to be reserved

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In order to let the PciBus user choose where a device should be placed
on the bus, a new function get_device_id() is introduced. This will be
helpful in the context of snapshot/restore as the caller will be able to
place the PCI devices on the same slot they were placed before the
snapshot was taken.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-05-11 17:04:57 +02:00 committed by Rob Bradford
parent e577b64a58
commit 1e0ebb760f
1 changed files with 15 additions and 0 deletions
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15
pci/src/bus.rs
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@ -34,6 +34,8 @@ pub enum PciRootError {
NoPciDeviceSlotAvailable,
/// Invalid PCI device identifier provided.
InvalidPciDeviceSlot(usize),
/// Valid PCI device identifier but already used.
AlreadyInUsePciDeviceSlot(usize),
}
pub type Result<T> = std::result::Result<T, PciRootError>;
@ -155,6 +157,19 @@ impl PciBus {
Err(PciRootError::NoPciDeviceSlotAvailable)
}
pub fn get_device_id(&mut self, id: usize) -> Result<()> {
if id < NUM_DEVICE_IDS {
if !self.device_ids[id] {
self.device_ids[id] = true;
Ok(())
} else {
Err(PciRootError::AlreadyInUsePciDeviceSlot(id))
}
} else {
Err(PciRootError::InvalidPciDeviceSlot(id))
}
}
pub fn put_device_id(&mut self, id: usize) -> Result<()> {
if id < NUM_DEVICE_IDS {
self.device_ids[id] = false;