1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef __NX_H__
4 #define __NX_H__
5 
6 #include <crypto/ctr.h>
7 
8 #define NX_NAME		"nx-crypto"
9 #define NX_STRING	"IBM Power7+ Nest Accelerator Crypto Driver"
10 #define NX_VERSION	"1.0"
11 
12 /* a scatterlist in the format PHYP is expecting */
13 struct nx_sg {
14 	u64 addr;
15 	u32 rsvd;
16 	u32 len;
17 } __attribute((packed));
18 
19 #define NX_PAGE_SIZE		(4096)
20 #define NX_MAX_SG_ENTRIES	(NX_PAGE_SIZE/(sizeof(struct nx_sg)))
21 
22 enum nx_status {
23 	NX_DISABLED,
24 	NX_WAITING,
25 	NX_OKAY
26 };
27 
28 /* msc_triplet and max_sync_cop are used only to assist in parsing the
29  * openFirmware property */
30 struct msc_triplet {
31 	u32 keybitlen;
32 	u32 databytelen;
33 	u32 sglen;
34 } __packed;
35 
36 struct max_sync_cop {
37 	u32 fc;
38 	u32 mode;
39 	u32 triplets;
40 	struct msc_triplet trip[];
41 } __packed;
42 
43 struct alg_props {
44 	u32 databytelen;
45 	u32 sglen;
46 };
47 
48 #define NX_OF_FLAG_MAXSGLEN_SET		(1)
49 #define NX_OF_FLAG_STATUS_SET		(2)
50 #define NX_OF_FLAG_MAXSYNCCOP_SET	(4)
51 #define NX_OF_FLAG_MASK_READY		(NX_OF_FLAG_MAXSGLEN_SET | \
52 					 NX_OF_FLAG_STATUS_SET |   \
53 					 NX_OF_FLAG_MAXSYNCCOP_SET)
54 struct nx_of {
55 	u32 flags;
56 	u32 max_sg_len;
57 	enum nx_status status;
58 	struct alg_props ap[NX_MAX_FC][NX_MAX_MODE][3];
59 };
60 
61 struct nx_stats {
62 	atomic_t aes_ops;
63 	atomic64_t aes_bytes;
64 	atomic_t sha256_ops;
65 	atomic64_t sha256_bytes;
66 	atomic_t sha512_ops;
67 	atomic64_t sha512_bytes;
68 
69 	atomic_t sync_ops;
70 
71 	atomic_t errors;
72 	atomic_t last_error;
73 	atomic_t last_error_pid;
74 };
75 
76 struct nx_crypto_driver {
77 	struct nx_stats    stats;
78 	struct nx_of       of;
79 	struct vio_dev    *viodev;
80 	struct vio_driver  viodriver;
81 	struct dentry     *dfs_root;
82 };
83 
84 #define NX_GCM4106_NONCE_LEN		(4)
85 #define NX_GCM_CTR_OFFSET		(12)
86 struct nx_gcm_rctx {
87 	u8 iv[16];
88 };
89 
90 struct nx_gcm_priv {
91 	u8 iauth_tag[16];
92 	u8 nonce[NX_GCM4106_NONCE_LEN];
93 };
94 
95 #define NX_CCM_AES_KEY_LEN		(16)
96 #define NX_CCM4309_AES_KEY_LEN		(19)
97 #define NX_CCM4309_NONCE_LEN		(3)
98 struct nx_ccm_rctx {
99 	u8 iv[16];
100 };
101 
102 struct nx_ccm_priv {
103 	u8 b0[16];
104 	u8 iauth_tag[16];
105 	u8 oauth_tag[16];
106 	u8 nonce[NX_CCM4309_NONCE_LEN];
107 };
108 
109 struct nx_xcbc_priv {
110 	u8 key[16];
111 };
112 
113 struct nx_ctr_priv {
114 	u8 nonce[CTR_RFC3686_NONCE_SIZE];
115 };
116 
117 struct nx_crypto_ctx {
118 	spinlock_t lock;	  /* synchronize access to the context */
119 	void *kmem;		  /* unaligned, kmalloc'd buffer */
120 	size_t kmem_len;	  /* length of kmem */
121 	struct nx_csbcpb *csbcpb; /* aligned page given to phyp @ hcall time */
122 	struct vio_pfo_op op;     /* operation struct with hcall parameters */
123 	struct nx_csbcpb *csbcpb_aead; /* secondary csbcpb used by AEAD algs */
124 	struct vio_pfo_op op_aead;/* operation struct for csbcpb_aead */
125 
126 	struct nx_sg *in_sg;      /* aligned pointer into kmem to an sg list */
127 	struct nx_sg *out_sg;     /* aligned pointer into kmem to an sg list */
128 
129 	struct alg_props *ap;	  /* pointer into props based on our key size */
130 	struct alg_props props[3];/* openFirmware properties for requests */
131 	struct nx_stats *stats;   /* pointer into an nx_crypto_driver for stats
132 				     reporting */
133 
134 	union {
135 		struct nx_gcm_priv gcm;
136 		struct nx_ccm_priv ccm;
137 		struct nx_xcbc_priv xcbc;
138 		struct nx_ctr_priv ctr;
139 	} priv;
140 };
141 
142 struct crypto_aead;
143 
144 /* prototypes */
145 int nx_crypto_ctx_aes_ccm_init(struct crypto_aead *tfm);
146 int nx_crypto_ctx_aes_gcm_init(struct crypto_aead *tfm);
147 int nx_crypto_ctx_aes_xcbc_init(struct crypto_tfm *tfm);
148 int nx_crypto_ctx_aes_ctr_init(struct crypto_skcipher *tfm);
149 int nx_crypto_ctx_aes_cbc_init(struct crypto_skcipher *tfm);
150 int nx_crypto_ctx_aes_ecb_init(struct crypto_skcipher *tfm);
151 int nx_crypto_ctx_sha_init(struct crypto_tfm *tfm);
152 void nx_crypto_ctx_exit(struct crypto_tfm *tfm);
153 void nx_crypto_ctx_skcipher_exit(struct crypto_skcipher *tfm);
154 void nx_crypto_ctx_aead_exit(struct crypto_aead *tfm);
155 void nx_ctx_init(struct nx_crypto_ctx *nx_ctx, unsigned int function);
156 int nx_hcall_sync(struct nx_crypto_ctx *ctx, struct vio_pfo_op *op,
157 		  u32 may_sleep);
158 struct nx_sg *nx_build_sg_list(struct nx_sg *, u8 *, unsigned int *, u32);
159 int nx_build_sg_lists(struct nx_crypto_ctx *nx_ctx, const u8 *iv,
160 		      struct scatterlist *dst, struct scatterlist *src,
161 		      unsigned int *nbytes, unsigned int offset, u8 *oiv);
162 struct nx_sg *nx_walk_and_build(struct nx_sg *, unsigned int,
163 				struct scatterlist *, unsigned int,
164 				unsigned int *);
165 
166 #ifdef CONFIG_DEBUG_FS
167 #define NX_DEBUGFS_INIT(drv)	nx_debugfs_init(drv)
168 #define NX_DEBUGFS_FINI(drv)	nx_debugfs_fini(drv)
169 
170 void nx_debugfs_init(struct nx_crypto_driver *);
171 void nx_debugfs_fini(struct nx_crypto_driver *);
172 #else
173 #define NX_DEBUGFS_INIT(drv)	(0)
174 #define NX_DEBUGFS_FINI(drv)	(0)
175 #endif
176 
177 #define NX_PAGE_NUM(x)		((u64)(x) & 0xfffffffffffff000ULL)
178 
179 extern struct skcipher_alg nx_cbc_aes_alg;
180 extern struct skcipher_alg nx_ecb_aes_alg;
181 extern struct aead_alg nx_gcm_aes_alg;
182 extern struct aead_alg nx_gcm4106_aes_alg;
183 extern struct skcipher_alg nx_ctr3686_aes_alg;
184 extern struct aead_alg nx_ccm_aes_alg;
185 extern struct aead_alg nx_ccm4309_aes_alg;
186 extern struct shash_alg nx_shash_aes_xcbc_alg;
187 extern struct shash_alg nx_shash_sha512_alg;
188 extern struct shash_alg nx_shash_sha256_alg;
189 
190 extern struct nx_crypto_driver nx_driver;
191 
192 #define SCATTERWALK_TO_SG	1
193 #define SCATTERWALK_FROM_SG	0
194 
195 #endif
196