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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2341c2f8 MP |
2 | #ifndef _LINUX_T10_PI_H |
3 | #define _LINUX_T10_PI_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/blkdev.h> | |
7 | ||
8475c811 CH |
8 | /* |
9 | * A T10 PI-capable target device can be formatted with different | |
10 | * protection schemes. Currently 0 through 3 are defined: | |
11 | * | |
12 | * Type 0 is regular (unprotected) I/O | |
13 | * | |
14 | * Type 1 defines the contents of the guard and reference tags | |
15 | * | |
16 | * Type 2 defines the contents of the guard and reference tags and | |
17 | * uses 32-byte commands to seed the latter | |
18 | * | |
19 | * Type 3 defines the contents of the guard tag only | |
20 | */ | |
21 | enum t10_dif_type { | |
22 | T10_PI_TYPE0_PROTECTION = 0x0, | |
23 | T10_PI_TYPE1_PROTECTION = 0x1, | |
24 | T10_PI_TYPE2_PROTECTION = 0x2, | |
25 | T10_PI_TYPE3_PROTECTION = 0x3, | |
26 | }; | |
27 | ||
2341c2f8 MP |
28 | /* |
29 | * T10 Protection Information tuple. | |
30 | */ | |
31 | struct t10_pi_tuple { | |
32 | __be16 guard_tag; /* Checksum */ | |
33 | __be16 app_tag; /* Opaque storage */ | |
34 | __be32 ref_tag; /* Target LBA or indirect LBA */ | |
35 | }; | |
36 | ||
128b6f9f DM |
37 | #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) |
38 | #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff) | |
2341c2f8 | 39 | |
ddd0bc75 MG |
40 | static inline u32 t10_pi_ref_tag(struct request *rq) |
41 | { | |
42 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
43 | return blk_rq_pos(rq) >> | |
44 | (rq->q->integrity.interval_exp - 9) & 0xffffffff; | |
45 | #else | |
46 | return -1U; | |
47 | #endif | |
48 | } | |
49 | ||
869ab90f EB |
50 | extern const struct blk_integrity_profile t10_pi_type1_crc; |
51 | extern const struct blk_integrity_profile t10_pi_type1_ip; | |
52 | extern const struct blk_integrity_profile t10_pi_type3_crc; | |
53 | extern const struct blk_integrity_profile t10_pi_type3_ip; | |
08fcf813 JA |
54 | |
55 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
10c41ddd MG |
56 | extern void t10_pi_prepare(struct request *rq, u8 protection_type); |
57 | extern void t10_pi_complete(struct request *rq, u8 protection_type, | |
58 | unsigned int intervals); | |
08fcf813 JA |
59 | #else |
60 | static inline void t10_pi_complete(struct request *rq, u8 protection_type, | |
61 | unsigned int intervals) | |
62 | { | |
63 | } | |
64 | static inline void t10_pi_prepare(struct request *rq, u8 protection_type) | |
65 | { | |
66 | } | |
67 | #endif | |
2341c2f8 MP |
68 | |
69 | #endif |