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141 lines
3.8 KiB
141 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2010 Marco Stornelli <[email protected]> |
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* Copyright (C) 2011 Kees Cook <[email protected]> |
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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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