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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_BLK_INTEGRITY_H
3#define _LINUX_BLK_INTEGRITY_H
4
5#include <linux/blk-mq.h>
6#include <linux/bio-integrity.h>
7#include <linux/blk-mq-dma.h>
8
9struct request;
10
11/*
12 * Maximum contiguous integrity buffer allocation.
13 */
14#define BLK_INTEGRITY_MAX_SIZE SZ_2M
15
16enum blk_integrity_flags {
17 BLK_INTEGRITY_NOVERIFY = 1 << 0,
18 BLK_INTEGRITY_NOGENERATE = 1 << 1,
19 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
20 BLK_INTEGRITY_REF_TAG = 1 << 3,
21 BLK_INTEGRITY_STACKED = 1 << 4,
22};
23
24const char *blk_integrity_profile_name(struct blk_integrity *bi);
25bool queue_limits_stack_integrity(struct queue_limits *t,
26 struct queue_limits *b);
27static inline bool queue_limits_stack_integrity_bdev(struct queue_limits *t,
28 struct block_device *bdev)
29{
30 return queue_limits_stack_integrity(t, &bdev->bd_disk->queue->limits);
31}
32
33#ifdef CONFIG_BLK_DEV_INTEGRITY
34int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
35
36int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
37int blk_rq_integrity_map_user(struct request *rq, void __user *ubuf,
38 ssize_t bytes);
39int blk_get_meta_cap(struct block_device *bdev, unsigned int cmd,
40 struct logical_block_metadata_cap __user *argp);
41bool blk_rq_integrity_dma_map_iter_start(struct request *req,
42 struct device *dma_dev, struct dma_iova_state *state,
43 struct blk_dma_iter *iter);
44bool blk_rq_integrity_dma_map_iter_next(struct request *req,
45 struct device *dma_dev, struct blk_dma_iter *iter);
46
47static inline bool
48blk_integrity_queue_supports_integrity(struct request_queue *q)
49{
50 return q->limits.integrity.metadata_size;
51}
52
53static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
54{
55 if (!blk_integrity_queue_supports_integrity(disk->queue))
56 return NULL;
57 return &disk->queue->limits.integrity;
58}
59
60static inline struct blk_integrity *
61bdev_get_integrity(struct block_device *bdev)
62{
63 return blk_get_integrity(bdev->bd_disk);
64}
65
66static inline unsigned short
67queue_max_integrity_segments(const struct request_queue *q)
68{
69 return q->limits.max_integrity_segments;
70}
71
72/**
73 * bio_integrity_intervals - Return number of integrity intervals for a bio
74 * @bi: blk_integrity profile for device
75 * @sectors: Size of the bio in 512-byte sectors
76 *
77 * Description: The block layer calculates everything in 512 byte
78 * sectors but integrity metadata is done in terms of the data integrity
79 * interval size of the storage device. Convert the block layer sectors
80 * to the appropriate number of integrity intervals.
81 */
82static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
83 unsigned int sectors)
84{
85 return sectors >> (bi->interval_exp - 9);
86}
87
88static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
89 unsigned int sectors)
90{
91 return bio_integrity_intervals(bi, sectors) * bi->metadata_size;
92}
93
94static inline bool blk_integrity_rq(struct request *rq)
95{
96 return rq->cmd_flags & REQ_INTEGRITY;
97}
98
99/*
100 * Return the current bvec that contains the integrity data. bip_iter may be
101 * advanced to iterate over the integrity data.
102 */
103static inline struct bio_vec rq_integrity_vec(struct request *rq)
104{
105 return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec,
106 rq->bio->bi_integrity->bip_iter);
107}
108#else /* CONFIG_BLK_DEV_INTEGRITY */
109static inline int blk_get_meta_cap(struct block_device *bdev, unsigned int cmd,
110 struct logical_block_metadata_cap __user *argp)
111{
112 return -ENOIOCTLCMD;
113}
114static inline int blk_rq_count_integrity_sg(struct request_queue *q,
115 struct bio *b)
116{
117 return 0;
118}
119static inline int blk_rq_map_integrity_sg(struct request *q,
120 struct scatterlist *s)
121{
122 return 0;
123}
124static inline int blk_rq_integrity_map_user(struct request *rq,
125 void __user *ubuf,
126 ssize_t bytes)
127{
128 return -EINVAL;
129}
130static inline bool blk_rq_integrity_dma_map_iter_start(struct request *req,
131 struct device *dma_dev, struct dma_iova_state *state,
132 struct blk_dma_iter *iter)
133{
134 return false;
135}
136static inline bool blk_rq_integrity_dma_map_iter_next(struct request *req,
137 struct device *dma_dev, struct blk_dma_iter *iter)
138{
139 return false;
140}
141static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
142{
143 return NULL;
144}
145static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
146{
147 return NULL;
148}
149static inline bool
150blk_integrity_queue_supports_integrity(struct request_queue *q)
151{
152 return false;
153}
154static inline unsigned short
155queue_max_integrity_segments(const struct request_queue *q)
156{
157 return 0;
158}
159
160static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
161 unsigned int sectors)
162{
163 return 0;
164}
165
166static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
167 unsigned int sectors)
168{
169 return 0;
170}
171static inline int blk_integrity_rq(struct request *rq)
172{
173 return 0;
174}
175
176static inline struct bio_vec rq_integrity_vec(struct request *rq)
177{
178 /* the optimizer will remove all calls to this function */
179 return (struct bio_vec){ };
180}
181#endif /* CONFIG_BLK_DEV_INTEGRITY */
182
183#endif /* _LINUX_BLK_INTEGRITY_H */