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/*
* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __LINUX_PSTORE_RAM_H__
#define __LINUX_PSTORE_RAM_H__
#include <linux/compiler.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/types.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)
struct persistent_ram_buffer;
struct rs_control;
struct persistent_ram_ecc_info {
int block_size;
int ecc_size;
int symsize;
int poly;
uint16_t *par;
};
struct persistent_ram_zone {
phys_addr_t paddr;
size_t size;
void *vaddr;
struct persistent_ram_buffer *buffer;
size_t buffer_size;
u32 flags;
raw_spinlock_t buffer_lock;
/* ECC correction */
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);
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);
/*
* Ramoops platform data
* @mem_size memory size for ramoops
* @mem_address physical memory address to contain ramoops
*/
#define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0)
struct ramoops_platform_data {
unsigned long mem_size;
phys_addr_t mem_address;
unsigned int mem_type;
unsigned long record_size;
unsigned long console_size;
unsigned long ftrace_size;
unsigned long pmsg_size;
int dump_oops;
u32 flags;
struct persistent_ram_ecc_info ecc_info;
};
#endif
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