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         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