| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |