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 scsi_cmnd *cmd) 42 { 43 const struct bio_crypt_ctx *crypt_ctx = scsi_cmd_to_rq(cmd)->crypt_ctx; 44 struct ufshcd_lrb *lrbp = scsi_cmd_priv(cmd); 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 scsi_cmnd *cmd) 55 { 56 struct ufshcd_lrb *lrbp = scsi_cmd_priv(cmd); 57 58 if (!(hba->quirks & UFSHCD_QUIRK_KEYS_IN_PRDT)) 59 return; 60 61 if (!(scsi_cmd_to_rq(cmd)->crypt_ctx)) 62 return; 63 64 /* Zeroize the PRDT because it can contain cryptographic keys. */ 65 memzero_explicit(lrbp->ucd_prdt_ptr, 66 ufshcd_sg_entry_size(hba) * scsi_sg_count(cmd)); 67 } 68 69 bool ufshcd_crypto_enable(struct ufs_hba *hba); 70 71 int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba); 72 73 void ufshcd_init_crypto(struct ufs_hba *hba); 74 75 void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q); 76 77 #else /* CONFIG_SCSI_UFS_CRYPTO */ 78 79 static inline void ufshcd_prepare_lrbp_crypto(struct request *rq, 80 struct ufshcd_lrb *lrbp) { } 81 82 static inline void 83 ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp, 84 struct request_desc_header *h) { } 85 86 static inline int ufshcd_crypto_fill_prdt(struct ufs_hba *hba, 87 struct scsi_cmnd *cmd) 88 { 89 return 0; 90 } 91 92 static inline void ufshcd_crypto_clear_prdt(struct ufs_hba *hba, 93 struct scsi_cmnd *cmd) 94 { 95 } 96 97 static inline bool ufshcd_crypto_enable(struct ufs_hba *hba) 98 { 99 return false; 100 } 101 102 static inline int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba) 103 { 104 return 0; 105 } 106 107 static inline void ufshcd_init_crypto(struct ufs_hba *hba) { } 108 109 static inline void ufshcd_crypto_register(struct ufs_hba *hba, 110 struct request_queue *q) { } 111 112 #endif /* CONFIG_SCSI_UFS_CRYPTO */ 113 114 #endif /* _UFSHCD_CRYPTO_H */ 115