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/device.h>
  21 #include <linux/kernel.h>
  22 #include <linux/list.h>
  23 #include <linux/types.h>
  24 #include <linux/init.h>
  25
  26 struct persistent_ram_buffer;
  27
  28 struct persistent_ram_descriptor {
  29         const char      *name;
  30         phys_addr_t     size;
  31 };
  32
  33 struct persistent_ram {
  34         phys_addr_t     start;
  35         phys_addr_t     size;
  36
  37         int                                     num_descs;
  38         struct persistent_ram_descriptor        *descs;
  39
  40         struct list_head node;
  41 };
  42
  43 struct persistent_ram_zone {
  44         phys_addr_t paddr;
  45         size_t size;
  46         void *vaddr;
  47         struct persistent_ram_buffer *buffer;
  48         size_t buffer_size;
  49
  50         /* ECC correction */
  51         bool ecc;
  52         char *par_buffer;
  53         char *par_header;
  54         struct rs_control *rs_decoder;
  55         int corrected_bytes;
  56         int bad_blocks;
  57         int ecc_block_size;
  58         int ecc_size;
  59         int ecc_symsize;
  60         int ecc_poly;
  61
  62         char *old_log;
  63         size_t old_log_size;
  64 };
  65
  66 int persistent_ram_early_init(struct persistent_ram *ram);
  67
  68 struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
  69                                                        size_t size,
  70                                                        bool ecc);
  71 void persistent_ram_free(struct persistent_ram_zone *prz);
  72 void persistent_ram_zap(struct persistent_ram_zone *prz);
  73 struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
  74                 bool ecc);
  75
  76 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
  77         unsigned int count);
  78
  79 void persistent_ram_save_old(struct persistent_ram_zone *prz);
  80 size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
  81 void *persistent_ram_old(struct persistent_ram_zone *prz);
  82 void persistent_ram_free_old(struct persistent_ram_zone *prz);
  83 ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
  84         char *str, size_t len);
  85
  86 /*
  87  * Ramoops platform data
  88  * @mem_size    memory size for ramoops
  89  * @mem_address physical memory address to contain ramoops
  90  */
  91
  92 struct ramoops_platform_data {
  93         unsigned long   mem_size;
  94         unsigned long   mem_address;
  95         unsigned long   record_size;
  96         int             dump_oops;
  97         bool            ecc;
  98 };
  99
 100 #endif