663deb4788
In preparation of not locking at all for certain buffers depending on if there's contention, make locking optional depending on the initialization of the prz. Signed-off-by: Joel Fernandes <joelaf@google.com> [kees: moved locking flag into prz instead of via caller arguments] Signed-off-by: Kees Cook <keescook@chromium.org>
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/*
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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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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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/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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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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};
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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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struct persistent_ram_buffer *buffer;
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size_t buffer_size;
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u32 flags;
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raw_spinlock_t buffer_lock;
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/* ECC correction */
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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);
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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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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 dump_oops;
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struct persistent_ram_ecc_info ecc_info;
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};
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#endif
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