2 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
3 * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
4 * Copyright (C) 2011 Google, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #ifndef __LINUX_PSTORE_RAM_H__
18 #define __LINUX_PSTORE_RAM_H__
20 #include <linux/compiler.h>
21 #include <linux/device.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/types.h>
28 * Choose whether access to the RAM zone requires locking or not. If a zone
29 * can be written to from different CPUs like with ftrace for example, then
30 * PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required.
32 #define PRZ_FLAG_NO_LOCK BIT(0)
34 struct persistent_ram_buffer
;
37 struct persistent_ram_ecc_info
{
44 struct persistent_ram_zone
{
48 struct persistent_ram_buffer
*buffer
;
51 raw_spinlock_t buffer_lock
;
56 struct rs_control
*rs_decoder
;
59 struct persistent_ram_ecc_info ecc_info
;
65 struct persistent_ram_zone
*persistent_ram_new(phys_addr_t start
, size_t size
,
66 u32 sig
, struct persistent_ram_ecc_info
*ecc_info
,
67 unsigned int memtype
, u32 flags
);
68 void persistent_ram_free(struct persistent_ram_zone
*prz
);
69 void persistent_ram_zap(struct persistent_ram_zone
*prz
);
71 int persistent_ram_write(struct persistent_ram_zone
*prz
, const void *s
,
73 int persistent_ram_write_user(struct persistent_ram_zone
*prz
,
74 const void __user
*s
, unsigned int count
);
76 void persistent_ram_save_old(struct persistent_ram_zone
*prz
);
77 size_t persistent_ram_old_size(struct persistent_ram_zone
*prz
);
78 void *persistent_ram_old(struct persistent_ram_zone
*prz
);
79 void persistent_ram_free_old(struct persistent_ram_zone
*prz
);
80 ssize_t
persistent_ram_ecc_string(struct persistent_ram_zone
*prz
,
81 char *str
, size_t len
);
82 #ifdef CONFIG_PSTORE_RAM_ANNOTATION_APPEND
83 __printf(1, 2) int persistent_ram_annotation_append(const char *fmt
, ...);
84 void persistent_ram_annotation_merge(struct persistent_ram_zone
*prz
);
86 static inline __printf(1, 2) void persistent_ram_annotation_append(
87 const char *fmt
, ...) { };
88 static inline void persistent_ram_annotation_merge(
89 struct persistent_ram_zone
*prz
) { };
92 void ramoops_console_write_buf(const char *buf
, size_t size
);
95 * Ramoops platform data
96 * @mem_size memory size for ramoops
97 * @mem_address physical memory address to contain ramoops
100 #define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0)
102 struct ramoops_platform_data
{
103 unsigned long mem_size
;
104 phys_addr_t mem_address
;
105 unsigned int mem_type
;
106 unsigned long record_size
;
107 unsigned long console_size
;
108 unsigned long ftrace_size
;
109 unsigned long pmsg_size
;
110 unsigned long annotate_size
;
113 struct persistent_ram_ecc_info ecc_info
;