drivers/crypto/nx/nx.h

   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[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_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