201e4aca5a
Without the update, we'll only see the new dmesg buffer after the reboot, but previously we could see it right away. Making an oops visible in pstore filesystem before reboot is a somewhat dubious feature, but removing it wasn't an intentional change, so let's restore it. For this we have to make persistent_ram_save_old() safe for calling multiple times, and also extern it. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2.5 KiB
C
100 lines
2.5 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/device.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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#include <linux/init.h>
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struct persistent_ram_buffer;
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struct persistent_ram_descriptor {
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const char *name;
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phys_addr_t size;
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};
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struct persistent_ram {
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phys_addr_t start;
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phys_addr_t size;
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int num_descs;
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struct persistent_ram_descriptor *descs;
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struct list_head node;
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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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/* ECC correction */
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bool ecc;
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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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int ecc_block_size;
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int ecc_size;
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int ecc_symsize;
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int ecc_poly;
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char *old_log;
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size_t old_log_size;
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};
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int persistent_ram_early_init(struct persistent_ram *ram);
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struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
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size_t size,
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bool ecc);
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void persistent_ram_free(struct persistent_ram_zone *prz);
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struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
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bool ecc);
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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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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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unsigned long mem_address;
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unsigned long record_size;
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int dump_oops;
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bool ecc;
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};
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#endif
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