/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PSTORE_ZONE_H_
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#define __PSTORE_ZONE_H_
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#include <linux/types.h>
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typedef ssize_t (*pstore_zone_read_op)(char *, size_t, loff_t);
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typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t);
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typedef ssize_t (*pstore_zone_erase_op)(size_t, loff_t);
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/**
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* struct pstore_zone_info - pstore/zone back-end driver structure
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*
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* @owner: Module which is responsible for this back-end driver.
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* @name: Name of the back-end driver.
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* @total_size: The total size in bytes pstore/zone can use. It must be greater
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* than 4096 and be multiple of 4096.
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* @kmsg_size: The size of oops/panic zone. Zero means disabled, otherwise,
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* it must be multiple of SECTOR_SIZE(512 Bytes).
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* @max_reason: Maximum kmsg dump reason to store.
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* @pmsg_size: The size of pmsg zone which is the same as @kmsg_size.
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* @console_size:The size of console zone which is the same as @kmsg_size.
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* @ftrace_size:The size of ftrace zone which is the same as @kmsg_size.
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* @read: The general read operation. Both of the function parameters
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* @size and @offset are relative value to storage.
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* On success, the number of bytes should be returned, others
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* mean error.
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* @write: The same as @read, but the following error number:
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* -EBUSY means try to write again later.
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* -ENOMSG means to try next zone.
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* @erase: The general erase operation for device with special removing
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* job. Both of the function parameters @size and @offset are
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* relative value to storage.
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* Return 0 on success and others on failure.
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* @panic_write:The write operation only used for panic case. It's optional
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* if you do not care panic log. The parameters are relative
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* value to storage.
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* On success, the number of bytes should be returned, others
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* excluding -ENOMSG mean error. -ENOMSG means to try next zone.
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*/
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struct pstore_zone_info {
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struct module *owner;
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const char *name;
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unsigned long total_size;
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unsigned long kmsg_size;
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int max_reason;
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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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pstore_zone_read_op read;
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pstore_zone_write_op write;
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pstore_zone_erase_op erase;
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pstore_zone_write_op panic_write;
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};
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extern int register_pstore_zone(struct pstore_zone_info *info);
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extern void unregister_pstore_zone(struct pstore_zone_info *info);
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#endif
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