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 char *label; 50 struct persistent_ram_buffer *buffer; 51 size_t buffer_size; 52 u32 flags; 53 raw_spinlock_t buffer_lock; 54 55 /* ECC correction */ 56 char *par_buffer; 57 char *par_header; 58 struct rs_control *rs_decoder; 59 int corrected_bytes; 60 int bad_blocks; 61 struct persistent_ram_ecc_info ecc_info; 62 63 char *old_log; 64 size_t old_log_size; 65 }; 66 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); 72 73 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, 74 unsigned int count); 75 int persistent_ram_write_user(struct persistent_ram_zone *prz, 76 const void __user *s, unsigned int count); 77 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); 84 85 /* 86 * Ramoops platform data 87 * @mem_size memory size for ramoops 88 * @mem_address physical memory address to contain ramoops 89 */ 90 91 #define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0) 92 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; 101 int dump_oops; 102 u32 flags; 103 struct persistent_ram_ecc_info ecc_info; 104 }; 105 106 #endif 107