1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * drivers/hyperhold/hyperhold.h
4  *
5  * Copyright (c) 2020-2022 Huawei Technologies Co., Ltd.
6  */
7 
8 #ifndef _HYPERHOLD_H_
9 #define _HYPERHOLD_H_
10 
11 #include <linux/kernel.h>
12 
13 struct hpio;
14 
15 typedef void (*hp_endio)(struct hpio *);
16 
17 void hyperhold_disable(bool force);
18 void hyperhold_enable(void);
19 bool is_hyperhold_enable(void);
20 
21 u32 hyperhold_nr_extent(void);
22 u32 hyperhold_extent_size(u32 eid);
23 long hyperhold_address(u32 eid, u32 offset);
24 int hyperhold_addr_extent(u64 addr);
25 int hyperhold_addr_offset(u64 addr);
26 
27 int hyperhold_alloc_extent(void);
28 void hyperhold_free_extent(u32 eid);
29 void hyperhold_should_free_extent(u32 eid);
30 
31 struct hpio *hyperhold_io_alloc(u32 eid, gfp_t gfp, unsigned int op, bool new_page);
32 void hyperhold_io_free(struct hpio *hpio);
33 
34 struct hpio *hyperhold_io_get(u32 eid, gfp_t gfp, unsigned int op);
35 bool hyperhold_io_put(struct hpio *hpio);
36 
37 void hyperhold_io_complete(struct hpio *hpio);
38 void hyperhold_io_wait(struct hpio *hpio);
39 
40 bool hyperhold_io_success(struct hpio *hpio);
41 
42 int hyperhold_io_extent(struct hpio *hpio);
43 int hyperhold_io_operate(struct hpio *hpio);
44 struct page *hyperhold_io_page(struct hpio *hpio, u32 index);
45 bool hyperhold_io_add_page(struct hpio *hpio, u32 index, struct page *page);
46 u32 hyperhold_io_nr_page(struct hpio *hpio);
47 void *hyperhold_io_private(struct hpio *hpio);
48 
49 int hyperhold_write_async(struct hpio *hpio, hp_endio endio, void *priv);
50 int hyperhold_read_async(struct hpio *hpio, hp_endio endio, void *priv);
51 
52 #endif
53