/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2025, Google LLC. * Pasha Tatashin <pasha.tatashin@soleen.com> */ #ifndef _LINUX_LUO_INTERNAL_H#define _LINUX_LUO_INTERNAL_H #include <linux/liveupdate.h>#include <linux/uaccess.h>#include <linux/kho_block.h> struct luo_ucmd {	void __user *ubuffer;	u32 user_size;	void *cmd;}; static inline int luo_ucmd_respond(struct luo_ucmd *ucmd,				   size_t kernel_cmd_size){	/*	 * Copy the minimum of what the user provided and what we actually	 * have.	 */	if (copy_to_user(ucmd->ubuffer, ucmd->cmd,			 min_t(size_t, ucmd->user_size, kernel_cmd_size))) {		return -EFAULT;	}	return 0;} /* * Handles a deserialization failure: devices and memory is in unpredictable * state. * * Continuing the boot process after a failure is dangerous because it could * lead to leaks of private data. */#define luo_restore_fail(__fmt, ...) panic(__fmt, ##__VA_ARGS__) /** * struct luo_file_set - A set of files that belong to the same sessions. * @files_list: An ordered list of files associated with this session, it is *              ordered by preservation time. * @block_set:  The set of serialization blocks. * @count:      A counter tracking the number of files currently stored in the *              @files_list for this session. */struct luo_file_set {	struct list_head files_list;	struct kho_block_set block_set;	u64 count;}; /** * struct luo_session - Represents an active or incoming Live Update session. * @name:       A unique name for this session, used for identification and *              retrieval. * @list:       A list_head member used to link this session into a global list *              of either outgoing (to be preserved) or incoming (restored from *              previous kernel) sessions. * @retrieved:  A boolean flag indicating whether this session has been *              retrieved by a consumer in the new kernel. * @file_set:   A set of files that belong to this session. * @mutex:      protects fields in the luo_session. */struct luo_session {	char name[LIVEUPDATE_SESSION_NAME_LENGTH];	struct list_head list;	bool retrieved;	struct luo_file_set file_set;	struct mutex mutex;}; extern struct rw_semaphore luo_register_rwlock; int luo_session_create(const char *name, struct file **filep);int luo_session_retrieve(const char *name, struct file **filep);void __init luo_session_setup_outgoing(u64 *sessions_pa);int __init luo_session_setup_incoming(u64 sessions_pa);int luo_session_serialize(void);int luo_session_deserialize(void); int luo_preserve_file(struct luo_file_set *file_set, u64 token, int fd);void luo_file_unpreserve_files(struct luo_file_set *file_set);int luo_file_freeze(struct luo_file_set *file_set,		    struct luo_file_set_ser *file_set_ser);void luo_file_unfreeze(struct luo_file_set *file_set,		       struct luo_file_set_ser *file_set_ser);int luo_retrieve_file(struct luo_file_set *file_set, u64 token,		      struct file **filep);int luo_file_finish(struct luo_file_set *file_set);int luo_file_deserialize(struct luo_file_set *file_set,			 struct luo_file_set_ser *file_set_ser);void luo_file_set_init(struct luo_file_set *file_set);void luo_file_set_destroy(struct luo_file_set *file_set); int luo_flb_file_preserve(struct liveupdate_file_handler *fh);void luo_flb_file_unpreserve(struct liveupdate_file_handler *fh);void luo_flb_file_finish(struct liveupdate_file_handler *fh);void luo_flb_unregister_all(struct liveupdate_file_handler *fh);int __init luo_flb_setup_outgoing(u64 *flbs_pa);void __init luo_flb_setup_incoming(u64 flbs_pa);void luo_flb_serialize(void); #ifdef CONFIG_LIVEUPDATE_TESTvoid liveupdate_test_register(struct liveupdate_file_handler *fh);#elsestatic inline void liveupdate_test_register(struct liveupdate_file_handler *fh) { }#endif #endif /* _LINUX_LUO_INTERNAL_H */