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nx.h
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1 
2 #ifndef __NX_H__
3 #define __NX_H__
4 
5 #define NX_NAME "nx-crypto"
6 #define NX_STRING "IBM Power7+ Nest Accelerator Crypto Driver"
7 #define NX_VERSION "1.0"
8 
9 static const char nx_driver_string[] = NX_STRING;
10 static const char nx_driver_version[] = NX_VERSION;
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[0];
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_debugfs {
77  struct dentry *dfs_root;
78  struct dentry *dfs_aes_ops, *dfs_aes_bytes;
79  struct dentry *dfs_sha256_ops, *dfs_sha256_bytes;
80  struct dentry *dfs_sha512_ops, *dfs_sha512_bytes;
81  struct dentry *dfs_errors, *dfs_last_error, *dfs_last_error_pid;
82 };
83 
84 struct nx_crypto_driver {
85  struct nx_stats stats;
86  struct nx_of of;
87  struct vio_dev *viodev;
88  struct vio_driver viodriver;
89  struct nx_debugfs dfs;
90 };
91 
92 #define NX_GCM4106_NONCE_LEN (4)
93 #define NX_GCM_CTR_OFFSET (12)
94 struct nx_gcm_priv {
95  u8 iv[16];
96  u8 iauth_tag[16];
97  u8 nonce[NX_GCM4106_NONCE_LEN];
98 };
99 
100 #define NX_CCM_AES_KEY_LEN (16)
101 #define NX_CCM4309_AES_KEY_LEN (19)
102 #define NX_CCM4309_NONCE_LEN (3)
103 struct nx_ccm_priv {
104  u8 iv[16];
105  u8 b0[16];
106  u8 iauth_tag[16];
107  u8 oauth_tag[16];
108  u8 nonce[NX_CCM4309_NONCE_LEN];
109 };
110 
111 struct nx_xcbc_priv {
112  u8 key[16];
113 };
114 
115 struct nx_ctr_priv {
116  u8 iv[16];
117 };
118 
119 struct nx_crypto_ctx {
120  void *kmem; /* unaligned, kmalloc'd buffer */
121  size_t kmem_len; /* length of kmem */
122  struct nx_csbcpb *csbcpb; /* aligned page given to phyp @ hcall time */
123  struct vio_pfo_op op; /* operation struct with hcall parameters */
124  struct nx_csbcpb *csbcpb_aead; /* secondary csbcpb used by AEAD algs */
125  struct vio_pfo_op op_aead;/* operation struct for csbcpb_aead */
126 
127  struct nx_sg *in_sg; /* aligned pointer into kmem to an sg list */
128  struct nx_sg *out_sg; /* aligned pointer into kmem to an sg list */
129 
130  struct alg_props *ap; /* pointer into props based on our key size */
131  struct alg_props props[3];/* openFirmware properties for requests */
132  struct nx_stats *stats; /* pointer into an nx_crypto_driver for stats
133  reporting */
134 
135  union {
136  struct nx_gcm_priv gcm;
137  struct nx_ccm_priv ccm;
138  struct nx_xcbc_priv xcbc;
139  struct nx_ctr_priv ctr;
140  } priv;
141 };
142 
143 /* prototypes */
144 int nx_crypto_ctx_aes_ccm_init(struct crypto_tfm *tfm);
145 int nx_crypto_ctx_aes_gcm_init(struct crypto_tfm *tfm);
146 int nx_crypto_ctx_aes_xcbc_init(struct crypto_tfm *tfm);
147 int nx_crypto_ctx_aes_ctr_init(struct crypto_tfm *tfm);
148 int nx_crypto_ctx_aes_cbc_init(struct crypto_tfm *tfm);
149 int nx_crypto_ctx_aes_ecb_init(struct crypto_tfm *tfm);
150 int nx_crypto_ctx_sha_init(struct crypto_tfm *tfm);
151 void nx_crypto_ctx_exit(struct crypto_tfm *tfm);
152 void nx_ctx_init(struct nx_crypto_ctx *nx_ctx, unsigned int function);
153 int nx_hcall_sync(struct nx_crypto_ctx *ctx, struct vio_pfo_op *op,
154  u32 may_sleep);
155 struct nx_sg *nx_build_sg_list(struct nx_sg *, u8 *, unsigned int, u32);
156 int nx_build_sg_lists(struct nx_crypto_ctx *, struct blkcipher_desc *,
157  struct scatterlist *, struct scatterlist *, unsigned int,
158  u8 *);
159 struct nx_sg *nx_walk_and_build(struct nx_sg *, unsigned int,
160  struct scatterlist *, unsigned int,
161  unsigned int);
162 
163 #ifdef CONFIG_DEBUG_FS
164 #define NX_DEBUGFS_INIT(drv) nx_debugfs_init(drv)
165 #define NX_DEBUGFS_FINI(drv) nx_debugfs_fini(drv)
166 
167 int nx_debugfs_init(struct nx_crypto_driver *);
168 void nx_debugfs_fini(struct nx_crypto_driver *);
169 #else
170 #define NX_DEBUGFS_INIT(drv) (0)
171 #define NX_DEBUGFS_FINI(drv) (0)
172 #endif
173 
174 #define NX_PAGE_NUM(x) ((u64)(x) & 0xfffffffffffff000ULL)
175 
176 extern struct crypto_alg nx_cbc_aes_alg;
177 extern struct crypto_alg nx_ecb_aes_alg;
178 extern struct crypto_alg nx_gcm_aes_alg;
179 extern struct crypto_alg nx_gcm4106_aes_alg;
180 extern struct crypto_alg nx_ctr_aes_alg;
181 extern struct crypto_alg nx_ctr3686_aes_alg;
182 extern struct crypto_alg nx_ccm_aes_alg;
183 extern struct crypto_alg nx_ccm4309_aes_alg;
184 extern struct shash_alg nx_shash_aes_xcbc_alg;
185 extern struct shash_alg nx_shash_sha512_alg;
186 extern struct shash_alg nx_shash_sha256_alg;
187 
188 extern struct nx_crypto_driver nx_driver;
189 
190 #define SCATTERWALK_TO_SG 1
191 #define SCATTERWALK_FROM_SG 0
192 
193 #endif
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