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