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 34 struct persistent_ram_buffer; 35 struct rs_control; 36 37 struct persistent_ram_ecc_info { 38 int block_size; 39 int ecc_size; 40 int symsize; 41 int poly; 42 }; 43 44 struct 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 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); 70 71 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, 72 unsigned int count); 73 int persistent_ram_write_user(struct persistent_ram_zone *prz, 74 const void __user *s, unsigned int count); 75 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 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 91 struct 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 105