99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
|
||
|
|
* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
|
||
|
|
* 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 BIT(0)
|
||
|
|
/*
|
||
|
|
* 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 BIT(1)
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 {
|
||
|
|
phys_addr_t paddr;
|
||
|
|
size_t size;
|
||
|
|
void *vaddr;
|
||
|
|
char *label;
|
||
|
|
enum pstore_type_id type;
|
||
|
|
u32 flags;
|
||
|
|
|
||
|
|
raw_spinlock_t buffer_lock;
|
||
|
|
struct persistent_ram_buffer *buffer;
|
||
|
|
size_t buffer_size;
|
||
|
|
|
||
|
|
char *par_buffer;
|
||
|
|
char *par_header;
|
||
|
|
struct rs_control *rs_decoder;
|
||
|
|
int corrected_bytes;
|
||
|
|
int bad_blocks;
|
||
|
|
struct persistent_ram_ecc_info ecc_info;
|
||
|
|
|
||
|
|
char *old_log;
|
||
|
|
size_t old_log_size;
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|