1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef _LINUX_T10_PI_H 1 #ifndef _LINUX_T10_PI_H
3 #define _LINUX_T10_PI_H 2 #define _LINUX_T10_PI_H
4 3
5 #include <linux/types.h> 4 #include <linux/types.h>
6 #include <linux/blk-mq.h> !! 5 #include <linux/blkdev.h>
7 6
8 /* 7 /*
9 * A T10 PI-capable target device can be forma 8 * A T10 PI-capable target device can be formatted with different
10 * protection schemes. Currently 0 through 3 9 * protection schemes. Currently 0 through 3 are defined:
11 * 10 *
12 * Type 0 is regular (unprotected) I/O 11 * Type 0 is regular (unprotected) I/O
13 * 12 *
14 * Type 1 defines the contents of the guard an 13 * Type 1 defines the contents of the guard and reference tags
15 * 14 *
16 * Type 2 defines the contents of the guard an 15 * Type 2 defines the contents of the guard and reference tags and
17 * uses 32-byte commands to seed the latter 16 * uses 32-byte commands to seed the latter
18 * 17 *
19 * Type 3 defines the contents of the guard ta 18 * Type 3 defines the contents of the guard tag only
20 */ 19 */
21 enum t10_dif_type { 20 enum t10_dif_type {
22 T10_PI_TYPE0_PROTECTION = 0x0, 21 T10_PI_TYPE0_PROTECTION = 0x0,
23 T10_PI_TYPE1_PROTECTION = 0x1, 22 T10_PI_TYPE1_PROTECTION = 0x1,
24 T10_PI_TYPE2_PROTECTION = 0x2, 23 T10_PI_TYPE2_PROTECTION = 0x2,
25 T10_PI_TYPE3_PROTECTION = 0x3, 24 T10_PI_TYPE3_PROTECTION = 0x3,
26 }; 25 };
27 26
28 /* 27 /*
29 * T10 Protection Information tuple. 28 * T10 Protection Information tuple.
30 */ 29 */
31 struct t10_pi_tuple { 30 struct t10_pi_tuple {
32 __be16 guard_tag; /* Checksum */ 31 __be16 guard_tag; /* Checksum */
33 __be16 app_tag; /* Opaque stor 32 __be16 app_tag; /* Opaque storage */
34 __be32 ref_tag; /* Target LBA 33 __be32 ref_tag; /* Target LBA or indirect LBA */
35 }; 34 };
36 35
37 #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) <<
38 #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffff <<
39 36
40 static inline u32 t10_pi_ref_tag(struct reques !! 37 extern struct blk_integrity_profile t10_pi_type1_crc;
41 { !! 38 extern struct blk_integrity_profile t10_pi_type1_ip;
42 unsigned int shift = ilog2(queue_logic !! 39 extern struct blk_integrity_profile t10_pi_type3_crc;
43 !! 40 extern struct blk_integrity_profile t10_pi_type3_ip;
44 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRIT <<
45 rq->q->limits.integrity.interval_e <<
46 shift = rq->q->limits.integrit <<
47 return blk_rq_pos(rq) >> (shift - SECT <<
48 } <<
49 <<
50 struct crc64_pi_tuple { <<
51 __be64 guard_tag; <<
52 __be16 app_tag; <<
53 __u8 ref_tag[6]; <<
54 }; <<
55 <<
56 /** <<
57 * lower_48_bits() - return bits 0-47 of a num <<
58 * @n: the number we're accessing <<
59 */ <<
60 static inline u64 lower_48_bits(u64 n) <<
61 { <<
62 return n & ((1ull << 48) - 1); <<
63 } <<
64 <<
65 static inline u64 ext_pi_ref_tag(struct reques <<
66 { <<
67 unsigned int shift = ilog2(queue_logic <<
68 <<
69 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRIT <<
70 rq->q->limits.integrity.interval_e <<
71 shift = rq->q->limits.integrit <<
72 return lower_48_bits(blk_rq_pos(rq) >> <<
73 } <<
74 41
75 #endif 42 #endif
76 43
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