include/linux/pstore_ram.h

   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