142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
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* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
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* Copyright (C) 2011 Google, Inc.
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*/
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#ifndef __LINUX_PSTORE_RAM_H__
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#define __LINUX_PSTORE_RAM_H__
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#include <linux/compiler.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/pstore.h>
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#include <linux/types.h>
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/*
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* Choose whether access to the RAM zone requires locking or not. If a zone
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* can be written to from different CPUs like with ftrace for example, then
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* PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required.
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*/
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#define PRZ_FLAG_NO_LOCK BIT(0)
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/*
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* If a PRZ should only have a single-boot lifetime, this marks it as
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* getting wiped after its contents get copied out after boot.
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*/
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#define PRZ_FLAG_ZAP_OLD BIT(1)
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struct persistent_ram_buffer;
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struct rs_control;
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struct persistent_ram_ecc_info {
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int block_size;
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int ecc_size;
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int symsize;
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int poly;
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uint16_t *par;
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};
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/**
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* struct persistent_ram_zone - Details of a persistent RAM zone (PRZ)
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* used as a pstore backend
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*
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* @paddr: physical address of the mapped RAM area
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* @size: size of mapping
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* @label: unique name of this PRZ
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* @type: frontend type for this PRZ
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* @flags: holds PRZ_FLAGS_* bits
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*
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* @buffer_lock:
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* locks access to @buffer "size" bytes and "start" offset
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* @buffer:
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* pointer to actual RAM area managed by this PRZ
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* @buffer_size:
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* bytes in @buffer->data (not including any trailing ECC bytes)
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*
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* @par_buffer:
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* pointer into @buffer->data containing ECC bytes for @buffer->data
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* @par_header:
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* pointer into @buffer->data containing ECC bytes for @buffer header
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* (i.e. all fields up to @data)
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* @rs_decoder:
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* RSLIB instance for doing ECC calculations
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* @corrected_bytes:
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* ECC corrected bytes accounting since boot
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* @bad_blocks:
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* ECC uncorrectable bytes accounting since boot
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* @ecc_info:
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* ECC configuration details
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*
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* @old_log:
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* saved copy of @buffer->data prior to most recent wipe
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* @old_log_size:
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* bytes contained in @old_log
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*
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*/
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struct persistent_ram_zone {
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phys_addr_t paddr;
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size_t size;
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void *vaddr;
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char *label;
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enum pstore_type_id type;
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u32 flags;
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raw_spinlock_t buffer_lock;
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struct persistent_ram_buffer *buffer;
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size_t buffer_size;
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char *par_buffer;
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char *par_header;
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struct rs_control *rs_decoder;
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int corrected_bytes;
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int bad_blocks;
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struct persistent_ram_ecc_info ecc_info;
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char *old_log;
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size_t old_log_size;
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};
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struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
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u32 sig, struct persistent_ram_ecc_info *ecc_info,
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unsigned int memtype, u32 flags, char *label);
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void persistent_ram_free(struct persistent_ram_zone *prz);
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void persistent_ram_zap(struct persistent_ram_zone *prz);
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int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
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unsigned int count);
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int persistent_ram_write_user(struct persistent_ram_zone *prz,
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const void __user *s, unsigned int count);
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void persistent_ram_save_old(struct persistent_ram_zone *prz);
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size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
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void *persistent_ram_old(struct persistent_ram_zone *prz);
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void persistent_ram_free_old(struct persistent_ram_zone *prz);
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ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
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char *str, size_t len);
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/*
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* Ramoops platform data
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* @mem_size memory size for ramoops
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* @mem_address physical memory address to contain ramoops
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*/
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#define RAMOOPS_FLAG_FTRACE_PER_CPU BIT(0)
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struct ramoops_platform_data {
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unsigned long mem_size;
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phys_addr_t mem_address;
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unsigned int mem_type;
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unsigned long record_size;
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unsigned long console_size;
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unsigned long ftrace_size;
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unsigned long pmsg_size;
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int max_reason;
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u32 flags;
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struct persistent_ram_ecc_info ecc_info;
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};
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#endif
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