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 16 static 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 28 static inline void 29 ufshcd_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 40 static 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 53 static 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 67 bool ufshcd_crypto_enable(struct ufs_hba *hba); 68 69 int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba); 70 71 void ufshcd_init_crypto(struct ufs_hba *hba); 72 73 void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q); 74 75 #else /* CONFIG_SCSI_UFS_CRYPTO */ 76 77 static inline void ufshcd_prepare_lrbp_crypto(struct request *rq, 78 struct ufshcd_lrb *lrbp) { } 79 80 static inline void 81 ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp, 82 struct request_desc_header *h) { } 83 84 static inline int ufshcd_crypto_fill_prdt(struct ufs_hba *hba, 85 struct ufshcd_lrb *lrbp) 86 { 87 return 0; 88 } 89 90 static inline void ufshcd_crypto_clear_prdt(struct ufs_hba *hba, 91 struct ufshcd_lrb *lrbp) { } 92 93 static inline bool ufshcd_crypto_enable(struct ufs_hba *hba) 94 { 95 return false; 96 } 97 98 static inline int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba) 99 { 100 return 0; 101 } 102 103 static inline void ufshcd_init_crypto(struct ufs_hba *hba) { } 104 105 static 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 */ 111