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/* SPDX-License-Identifier: GPL-2.0 */
/*
* PCI Live Update support (Public/Driver API)
*
* Copyright (c) 2026, Google LLC.
* David Matlack <dmatlack@google.com>
*/
#ifndef LINUX_PCI_LIVEUPDATE_H
#define LINUX_PCI_LIVEUPDATE_H
#include <linux/kho/abi/pci.h>
#include <linux/liveupdate.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
/**
* struct pci_liveupdate - PCI Live Update state for a struct pci_dev
* @outgoing: State preserved for the next kernel.
* @incoming: State preserved by the previous kernel.
* @was_incoming: True if this struct pci_dev was incoming-preserved when it was
* set up, i.e. it was matched to state preserved by the previous
* kernel. Unlike @incoming, this is never cleared, so it stays
* true after the device finishes participating in Live Update.
* @frozen: True if the outgoing preservation status of this device is frozen
* and thus cannot be changed.
*/
struct pci_liveupdate {
struct pci_dev_ser *outgoing;
struct pci_dev_ser *incoming;
bool was_incoming;
bool frozen;
};
struct pci_dev;
#ifdef CONFIG_PCI_LIVEUPDATE
int pci_liveupdate_register_flb(struct liveupdate_file_handler *fh);
void pci_liveupdate_unregister_flb(struct liveupdate_file_handler *fh);
int pci_liveupdate_preserve(struct pci_dev *dev);
void pci_liveupdate_unpreserve(struct pci_dev *dev);
void pci_liveupdate_finish(struct pci_dev *dev);
bool pci_liveupdate_is_incoming(struct pci_dev *dev);
#else
static inline int pci_liveupdate_register_flb(struct liveupdate_file_handler *fh)
{
return -EOPNOTSUPP;
}
static inline void pci_liveupdate_unregister_flb(struct liveupdate_file_handler *fh)
{
}
static inline int pci_liveupdate_preserve(struct pci_dev *dev)
{
return -EOPNOTSUPP;
}
static inline void pci_liveupdate_unpreserve(struct pci_dev *dev)
{
}
static inline void pci_liveupdate_finish(struct pci_dev *dev)
{
}
static inline bool pci_liveupdate_is_incoming(struct pci_dev *dev)
{
return false;
}
#endif
#endif /* LINUX_PCI_LIVEUPDATE_H */
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