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1525fb3bb6
In order to configure itself, the MTD backend needs to be able to query the current pstore configuration. Introduce pstore_blk_get_config() for this purpose. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-9-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PSTORE_BLK_H_
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#define __PSTORE_BLK_H_
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#include <linux/types.h>
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#include <linux/pstore.h>
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#include <linux/pstore_zone.h>
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/**
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* typedef pstore_blk_panic_write_op - panic write operation to block device
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*
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* @buf: the data to write
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* @start_sect: start sector to block device
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* @sects: sectors count on buf
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*
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* Return: On success, zero should be returned. Others excluding -ENOMSG
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* mean error. -ENOMSG means to try next zone.
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*
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* Panic write to block device must be aligned to SECTOR_SIZE.
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*/
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typedef int (*pstore_blk_panic_write_op)(const char *buf, sector_t start_sect,
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sector_t sects);
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/**
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* struct pstore_blk_info - pstore/blk registration details
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*
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* @major: Which major device number to support with pstore/blk
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* @flags: The supported PSTORE_FLAGS_* from linux/pstore.h.
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* @panic_write:The write operation only used for the panic case.
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* This can be NULL, but is recommended to avoid losing
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* crash data if the kernel's IO path or work queues are
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* broken during a panic.
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* @devt: The dev_t that pstore/blk has attached to.
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* @nr_sects: Number of sectors on @devt.
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* @start_sect: Starting sector on @devt.
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*/
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struct pstore_blk_info {
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unsigned int major;
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unsigned int flags;
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pstore_blk_panic_write_op panic_write;
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/* Filled in by pstore/blk after registration. */
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dev_t devt;
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sector_t nr_sects;
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sector_t start_sect;
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};
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int register_pstore_blk(struct pstore_blk_info *info);
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void unregister_pstore_blk(unsigned int major);
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/**
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* struct pstore_blk_config - the pstore_blk backend configuration
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*
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* @device: Name of the desired block device
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* @max_reason: Maximum kmsg dump reason to store to block device
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* @kmsg_size: Total size of for kmsg dumps
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* @pmsg_size: Total size of the pmsg storage area
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* @console_size: Total size of the console storage area
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* @ftrace_size: Total size for ftrace logging data (for all CPUs)
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*/
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struct pstore_blk_config {
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char device[80];
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enum kmsg_dump_reason max_reason;
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unsigned long kmsg_size;
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unsigned long pmsg_size;
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unsigned long console_size;
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unsigned long ftrace_size;
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};
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/**
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* pstore_blk_get_config - get a copy of the pstore_blk backend configuration
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*
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* @info: The sturct pstore_blk_config to be filled in
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*
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* Failure returns negative error code, and success returns 0.
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*/
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int pstore_blk_get_config(struct pstore_blk_config *info);
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#endif
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