Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
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.
5 *
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.
9 *
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.
14 *
15 */
16
17#ifndef __LINUX_PSTORE_RAM_H__
18#define __LINUX_PSTORE_RAM_H__
19
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>
26
27/*
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.
31 */
32#define PRZ_FLAG_NO_LOCK BIT(0)
33
34struct persistent_ram_buffer;
35struct rs_control;
36
37struct persistent_ram_ecc_info {
38 int block_size;
39 int ecc_size;
40 int symsize;
41 int poly;
42};
43
44struct persistent_ram_zone {
45 phys_addr_t paddr;
46 size_t size;
47 void *vaddr;
48 struct persistent_ram_buffer *buffer;
49 size_t buffer_size;
50 u32 flags;
51 raw_spinlock_t buffer_lock;
52
53 /* ECC correction */
54 char *par_buffer;
55 char *par_header;
56 struct rs_control *rs_decoder;
57 int corrected_bytes;
58 int bad_blocks;
59 struct persistent_ram_ecc_info ecc_info;
60
61 char *old_log;
62 size_t old_log_size;
63};
64
65struct 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);
68void persistent_ram_free(struct persistent_ram_zone *prz);
69void persistent_ram_zap(struct persistent_ram_zone *prz);
70
71int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
72 unsigned int count);
73int persistent_ram_write_user(struct persistent_ram_zone *prz,
74 const void __user *s, unsigned int count);
75
76void persistent_ram_save_old(struct persistent_ram_zone *prz);
77size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
78void *persistent_ram_old(struct persistent_ram_zone *prz);
79void persistent_ram_free_old(struct persistent_ram_zone *prz);
80ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
81 char *str, size_t len);
82
83/*
84 * Ramoops platform data
85 * @mem_size memory size for ramoops
86 * @mem_address physical memory address to contain ramoops
87 */
88
89#define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0)
90
91struct ramoops_platform_data {
92 unsigned long mem_size;
93 phys_addr_t mem_address;
94 unsigned int mem_type;
95 unsigned long record_size;
96 unsigned long console_size;
97 unsigned long ftrace_size;
98 unsigned long pmsg_size;
99 int dump_oops;
100 u32 flags;
101 struct persistent_ram_ecc_info ecc_info;
102};
103
104#endif