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 uint16_t *par; 43 }; 44 45 struct persistent_ram_zone { 46 phys_addr_t paddr; 47 size_t size; 48 void *vaddr; 49 struct persistent_ram_buffer *buffer; 50 size_t buffer_size; 51 u32 flags; 52 raw_spinlock_t buffer_lock; 53 54 /* ECC correction */ 55 char *par_buffer; 56 char *par_header; 57 struct rs_control *rs_decoder; 58 int corrected_bytes; 59 int bad_blocks; 60 struct persistent_ram_ecc_info ecc_info; 61 62 char *old_log; 63 size_t old_log_size; 64 }; 65 66 struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, 67 u32 sig, struct persistent_ram_ecc_info *ecc_info, 68 unsigned int memtype, u32 flags); 69 void persistent_ram_free(struct persistent_ram_zone *prz); 70 void persistent_ram_zap(struct persistent_ram_zone *prz); 71 72 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, 73 unsigned int count); 74 int persistent_ram_write_user(struct persistent_ram_zone *prz, 75 const void __user *s, unsigned int count); 76 77 void persistent_ram_save_old(struct persistent_ram_zone *prz); 78 size_t persistent_ram_old_size(struct persistent_ram_zone *prz); 79 void *persistent_ram_old(struct persistent_ram_zone *prz); 80 void persistent_ram_free_old(struct persistent_ram_zone *prz); 81 ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, 82 char *str, size_t len); 83 84 /* 85 * Ramoops platform data 86 * @mem_size memory size for ramoops 87 * @mem_address physical memory address to contain ramoops 88 */ 89 90 #define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0) 91 92 struct ramoops_platform_data { 93 unsigned long mem_size; 94 phys_addr_t mem_address; 95 unsigned int mem_type; 96 unsigned long record_size; 97 unsigned long console_size; 98 unsigned long ftrace_size; 99 unsigned long pmsg_size; 100 int dump_oops; 101 u32 flags; 102 struct persistent_ram_ecc_info ecc_info; 103 }; 104 105 #endif 106