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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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