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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright 2019 Google LLC
4 */
5
6#ifndef _UFSHCD_CRYPTO_H
7#define _UFSHCD_CRYPTO_H
8
9#include <scsi/scsi_cmnd.h>
10#include <ufs/ufshcd.h>
11#include "ufshcd-priv.h"
12#include <ufs/ufshci.h>
13
14#ifdef CONFIG_SCSI_UFS_CRYPTO
15
16static inline void ufshcd_prepare_lrbp_crypto(struct request *rq,
17 struct ufshcd_lrb *lrbp)
18{
19 if (!rq || !rq->crypt_keyslot) {
20 lrbp->crypto_key_slot = -1;
21 return;
22 }
23
24 lrbp->crypto_key_slot = blk_crypto_keyslot_index(rq->crypt_keyslot);
25 lrbp->data_unit_num = rq->crypt_ctx->bc_dun[0];
26}
27
28static inline void
29ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp,
30 struct request_desc_header *h)
31{
32 if (lrbp->crypto_key_slot < 0)
33 return;
34 h->enable_crypto = 1;
35 h->cci = lrbp->crypto_key_slot;
36 h->dunl = cpu_to_le32(lower_32_bits(lrbp->data_unit_num));
37 h->dunu = cpu_to_le32(upper_32_bits(lrbp->data_unit_num));
38}
39
40static inline int ufshcd_crypto_fill_prdt(struct ufs_hba *hba,
41 struct ufshcd_lrb *lrbp)
42{
43 struct scsi_cmnd *cmd = lrbp->cmd;
44 const struct bio_crypt_ctx *crypt_ctx = scsi_cmd_to_rq(cmd)->crypt_ctx;
45
46 if (crypt_ctx && hba->vops && hba->vops->fill_crypto_prdt)
47 return hba->vops->fill_crypto_prdt(hba, crypt_ctx,
48 lrbp->ucd_prdt_ptr,
49 scsi_sg_count(cmd));
50 return 0;
51}
52
53static inline void ufshcd_crypto_clear_prdt(struct ufs_hba *hba,
54 struct ufshcd_lrb *lrbp)
55{
56 if (!(hba->quirks & UFSHCD_QUIRK_KEYS_IN_PRDT))
57 return;
58
59 if (!(scsi_cmd_to_rq(lrbp->cmd)->crypt_ctx))
60 return;
61
62 /* Zeroize the PRDT because it can contain cryptographic keys. */
63 memzero_explicit(lrbp->ucd_prdt_ptr,
64 ufshcd_sg_entry_size(hba) * scsi_sg_count(lrbp->cmd));
65}
66
67bool ufshcd_crypto_enable(struct ufs_hba *hba);
68
69int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba);
70
71void ufshcd_init_crypto(struct ufs_hba *hba);
72
73void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q);
74
75#else /* CONFIG_SCSI_UFS_CRYPTO */
76
77static inline void ufshcd_prepare_lrbp_crypto(struct request *rq,
78 struct ufshcd_lrb *lrbp) { }
79
80static inline void
81ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp,
82 struct request_desc_header *h) { }
83
84static inline int ufshcd_crypto_fill_prdt(struct ufs_hba *hba,
85 struct ufshcd_lrb *lrbp)
86{
87 return 0;
88}
89
90static inline void ufshcd_crypto_clear_prdt(struct ufs_hba *hba,
91 struct ufshcd_lrb *lrbp) { }
92
93static inline bool ufshcd_crypto_enable(struct ufs_hba *hba)
94{
95 return false;
96}
97
98static inline int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba)
99{
100 return 0;
101}
102
103static inline void ufshcd_init_crypto(struct ufs_hba *hba) { }
104
105static inline void ufshcd_crypto_register(struct ufs_hba *hba,
106 struct request_queue *q) { }
107
108#endif /* CONFIG_SCSI_UFS_CRYPTO */
109
110#endif /* _UFSHCD_CRYPTO_H */