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 {
45 struct persistent_ram_zone {
50 struct persistent_ram_buffer *buffer;
53 raw_spinlock_t buffer_lock;
58 struct rs_control *rs_decoder;
61 struct persistent_ram_ecc_info ecc_info;
67 struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
68 u32 sig, struct persistent_ram_ecc_info *ecc_info,
69 unsigned int memtype, u32 flags, char *label);
70 void persistent_ram_free(struct persistent_ram_zone *prz);
71 void persistent_ram_zap(struct persistent_ram_zone *prz);
73 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
75 int persistent_ram_write_user(struct persistent_ram_zone *prz,
76 const void __user *s, unsigned int count);
78 void persistent_ram_save_old(struct persistent_ram_zone *prz);
79 size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
80 void *persistent_ram_old(struct persistent_ram_zone *prz);
81 void persistent_ram_free_old(struct persistent_ram_zone *prz);
82 ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
83 char *str, size_t len);
86 * Ramoops platform data
87 * @mem_size memory size for ramoops
88 * @mem_address physical memory address to contain ramoops
91 #define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0)
93 struct ramoops_platform_data {
94 unsigned long mem_size;
95 phys_addr_t mem_address;
96 unsigned int mem_type;
97 unsigned long record_size;
98 unsigned long console_size;
99 unsigned long ftrace_size;
100 unsigned long pmsg_size;
103 struct persistent_ram_ecc_info ecc_info;