/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2010 Marco Stornelli <[email protected]> * Copyright (C) 2011 Kees Cook <[email protected]> * Copyright (C) 2011 Google, Inc. */ #include <linux/pstore_ram.h> /* * Choose whether access to the RAM zone requires locking or not. If a zone * can be written to from different CPUs like with ftrace for example, then * PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required. */ #define PRZ_FLAG_NO_LOCK … /* * If a PRZ should only have a single-boot lifetime, this marks it as * getting wiped after its contents get copied out after boot. */ #define PRZ_FLAG_ZAP_OLD … /** * struct persistent_ram_zone - Details of a persistent RAM zone (PRZ) * used as a pstore backend * * @paddr: physical address of the mapped RAM area * @size: size of mapping * @label: unique name of this PRZ * @type: frontend type for this PRZ * @flags: holds PRZ_FLAGS_* bits * * @buffer_lock: * locks access to @buffer "size" bytes and "start" offset * @buffer: * pointer to actual RAM area managed by this PRZ * @buffer_size: * bytes in @buffer->data (not including any trailing ECC bytes) * * @par_buffer: * pointer into @buffer->data containing ECC bytes for @buffer->data * @par_header: * pointer into @buffer->data containing ECC bytes for @buffer header * (i.e. all fields up to @data) * @rs_decoder: * RSLIB instance for doing ECC calculations * @corrected_bytes: * ECC corrected bytes accounting since boot * @bad_blocks: * ECC uncorrectable bytes accounting since boot * @ecc_info: * ECC configuration details * * @old_log: * saved copy of @buffer->data prior to most recent wipe * @old_log_size: * bytes contained in @old_log * */ struct persistent_ram_zone { … }; struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, u32 sig, struct persistent_ram_ecc_info *ecc_info, unsigned int memtype, u32 flags, char *label); void persistent_ram_free(struct persistent_ram_zone **_prz); void persistent_ram_zap(struct persistent_ram_zone *prz); int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, unsigned int count); int persistent_ram_write_user(struct persistent_ram_zone *prz, const void __user *s, unsigned int count); void persistent_ram_save_old(struct persistent_ram_zone *prz); size_t persistent_ram_old_size(struct persistent_ram_zone *prz); void *persistent_ram_old(struct persistent_ram_zone *prz); void persistent_ram_free_old(struct persistent_ram_zone *prz); ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, char *str, size_t len);
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