drivers/crypto/bcm/cipher.h

   1
   2 /* SPDX-License-Identifier: GPL-2.0-only */
   3 /*
   4  * Copyright 2016 Broadcom
   5  */
   6
   7 #ifndef _CIPHER_H
   8 #define _CIPHER_H
   9
  10 #include <linux/atomic.h>
  11 #include <linux/mailbox/brcm-message.h>
  12 #include <linux/mailbox_client.h>
  13 #include <crypto/aes.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/internal/skcipher.h>
  16 #include <crypto/aead.h>
  17 #include <crypto/arc4.h>
  18 #include <crypto/gcm.h>
  19 #include <crypto/sha1.h>
  20 #include <crypto/sha2.h>
  21 #include <crypto/sha3.h>
  22
  23 #include "spu.h"
  24 #include "spum.h"
  25 #include "spu2.h"
  26
  27 /* Driver supports up to MAX_SPUS SPU blocks */
  28 #define MAX_SPUS 16
  29
  30 #define ARC4_STATE_SIZE     4
  31
  32 #define CCM_AES_IV_SIZE    16
  33 #define CCM_ESP_IV_SIZE     8
  34 #define RFC4543_ICV_SIZE   16
  35
  36 #define MAX_KEY_SIZE    ARC4_MAX_KEY_SIZE
  37 #define MAX_IV_SIZE     AES_BLOCK_SIZE
  38 #define MAX_DIGEST_SIZE SHA3_512_DIGEST_SIZE
  39 #define MAX_ASSOC_SIZE  512
  40
  41 /* size of salt value for AES-GCM-ESP and AES-CCM-ESP */
  42 #define GCM_ESP_SALT_SIZE   4
  43 #define CCM_ESP_SALT_SIZE   3
  44 #define MAX_SALT_SIZE       GCM_ESP_SALT_SIZE
  45 #define GCM_ESP_SALT_OFFSET 0
  46 #define CCM_ESP_SALT_OFFSET 1
  47
  48 #define GCM_ESP_DIGESTSIZE 16
  49
  50 #define MAX_HASH_BLOCK_SIZE SHA512_BLOCK_SIZE
  51
  52 /*
  53  * Maximum number of bytes from a non-final hash request that can be deferred
  54  * until more data is available. With new crypto API framework, this
  55  * can be no more than one block of data.
  56  */
  57 #define HASH_CARRY_MAX  MAX_HASH_BLOCK_SIZE
  58
  59 /* Force at least 4-byte alignment of all SPU message fields */
  60 #define SPU_MSG_ALIGN  4
  61
  62 /* Number of times to resend mailbox message if mb queue is full */
  63 #define SPU_MB_RETRY_MAX  1000
  64
  65 /* op_counts[] indexes */
  66 enum op_type {
  67         SPU_OP_CIPHER,
  68         SPU_OP_HASH,
  69         SPU_OP_HMAC,
  70         SPU_OP_AEAD,
  71         SPU_OP_NUM
  72 };
  73
  74 enum spu_spu_type {
  75         SPU_TYPE_SPUM,
  76         SPU_TYPE_SPU2,
  77 };
  78
  79 /*
  80  * SPUM_NS2 and SPUM_NSP are the SPU-M block on Northstar 2 and Northstar Plus,
  81  * respectively.
  82  */
  83 enum spu_spu_subtype {
  84         SPU_SUBTYPE_SPUM_NS2,
  85         SPU_SUBTYPE_SPUM_NSP,
  86         SPU_SUBTYPE_SPU2_V1,
  87         SPU_SUBTYPE_SPU2_V2
  88 };
  89
  90 struct spu_type_subtype {
  91         enum spu_spu_type type;
  92         enum spu_spu_subtype subtype;
  93 };
  94
  95 struct cipher_op {
  96         enum spu_cipher_alg alg;
  97         enum spu_cipher_mode mode;
  98 };
  99
 100 struct auth_op {
 101         enum hash_alg alg;
 102         enum hash_mode mode;
 103 };
 104
 105 struct iproc_alg_s {
 106         u32 type;
 107         union {
 108                 struct skcipher_alg skcipher;
 109                 struct ahash_alg hash;
 110                 struct aead_alg aead;
 111         } alg;
 112         struct cipher_op cipher_info;
 113         struct auth_op auth_info;
 114         bool auth_first;
 115         bool registered;
 116 };
 117
 118 /*
 119  * Buffers for a SPU request/reply message pair. All part of one structure to
 120  * allow a single alloc per request.
 121  */
 122 struct spu_msg_buf {
 123         /* Request message fragments */
 124
 125         /*
 126          * SPU request message header. For SPU-M, holds MH, EMH, SCTX, BDESC,
 127          * and BD header. For SPU2, holds FMD, OMD.
 128          */
 129         u8 bcm_spu_req_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 130
 131         /* IV or counter. Size to include salt. Also used for XTS tweek. */
 132         u8 iv_ctr[ALIGN(2 * AES_BLOCK_SIZE, SPU_MSG_ALIGN)];
 133
 134         /* Hash digest. request and response. */
 135         u8 digest[ALIGN(MAX_DIGEST_SIZE, SPU_MSG_ALIGN)];
 136
 137         /* SPU request message padding */
 138         u8 spu_req_pad[ALIGN(SPU_PAD_LEN_MAX, SPU_MSG_ALIGN)];
 139
 140         /* SPU-M request message STATUS field */
 141         u8 tx_stat[ALIGN(SPU_TX_STATUS_LEN, SPU_MSG_ALIGN)];
 142
 143         /* Response message fragments */
 144
 145         /* SPU response message header */
 146         u8 spu_resp_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 147
 148         /* SPU response message STATUS field padding */
 149         u8 rx_stat_pad[ALIGN(SPU_STAT_PAD_MAX, SPU_MSG_ALIGN)];
 150
 151         /* SPU response message STATUS field */
 152         u8 rx_stat[ALIGN(SPU_RX_STATUS_LEN, SPU_MSG_ALIGN)];
 153
 154         union {
 155                 /* Buffers only used for skcipher */
 156                 struct {
 157                         /*
 158                          * Field used for either SUPDT when RC4 is used
 159                          * -OR- tweak value when XTS/AES is used
 160                          */
 161                         u8 supdt_tweak[ALIGN(SPU_SUPDT_LEN, SPU_MSG_ALIGN)];
 162                 } c;
 163
 164                 /* Buffers only used for aead */
 165                 struct {
 166                         /* SPU response pad for GCM data */
 167                         u8 gcmpad[ALIGN(AES_BLOCK_SIZE, SPU_MSG_ALIGN)];
 168
 169                         /* SPU request msg padding for GCM AAD */
 170                         u8 req_aad_pad[ALIGN(SPU_PAD_LEN_MAX, SPU_MSG_ALIGN)];
 171
 172                         /* SPU response data to be discarded */
 173                         u8 resp_aad[ALIGN(MAX_ASSOC_SIZE + MAX_IV_SIZE,
 174                                           SPU_MSG_ALIGN)];
 175                 } a;
 176         };
 177 };
 178
 179 struct iproc_ctx_s {
 180         u8 enckey[MAX_KEY_SIZE + ARC4_STATE_SIZE];
 181         unsigned int enckeylen;
 182
 183         u8 authkey[MAX_KEY_SIZE + ARC4_STATE_SIZE];
 184         unsigned int authkeylen;
 185
 186         u8 salt[MAX_SALT_SIZE];
 187         unsigned int salt_len;
 188         unsigned int salt_offset;
 189         u8 iv[MAX_IV_SIZE];
 190
 191         unsigned int digestsize;
 192
 193         struct iproc_alg_s *alg;
 194         bool is_esp;
 195
 196         struct cipher_op cipher;
 197         enum spu_cipher_type cipher_type;
 198
 199         struct auth_op auth;
 200         bool auth_first;
 201
 202         /*
 203          * The maximum length in bytes of the payload in a SPU message for this
 204          * context. For SPU-M, the payload is the combination of AAD and data.
 205          * For SPU2, the payload is just data. A value of SPU_MAX_PAYLOAD_INF
 206          * indicates that there is no limit to the length of the SPU message
 207          * payload.
 208          */
 209         unsigned int max_payload;
 210
 211         struct crypto_aead *fallback_cipher;
 212
 213         /* auth_type is determined during processing of request */
 214
 215         u8 ipad[MAX_HASH_BLOCK_SIZE];
 216         u8 opad[MAX_HASH_BLOCK_SIZE];
 217
 218         /*
 219          * Buffer to hold SPU message header template. Template is created at
 220          * setkey time for skcipher requests, since most of the fields in the
 221          * header are known at that time. At request time, just fill in a few
 222          * missing pieces related to length of data in the request and IVs, etc.
 223          */
 224         u8 bcm_spu_req_hdr[ALIGN(SPU2_HEADER_ALLOC_LEN, SPU_MSG_ALIGN)];
 225
 226         /* Length of SPU request header */
 227         u16 spu_req_hdr_len;
 228
 229         /* Expected length of SPU response header */
 230         u16 spu_resp_hdr_len;
 231
 232         /*
 233          * shash descriptor - needed to perform incremental hashing in
 234          * in software, when hw doesn't support it.
 235          */
 236         struct shash_desc *shash;
 237
 238         bool is_rfc4543;        /* RFC 4543 style of GMAC */
 239 };
 240
 241 /* state from iproc_reqctx_s necessary for hash state export/import */
 242 struct spu_hash_export_s {
 243         unsigned int total_todo;
 244         unsigned int total_sent;
 245         u8 hash_carry[HASH_CARRY_MAX];
 246         unsigned int hash_carry_len;
 247         u8 incr_hash[MAX_DIGEST_SIZE];
 248         bool is_sw_hmac;
 249 };
 250
 251 struct iproc_reqctx_s {
 252         /* general context */
 253         struct crypto_async_request *parent;
 254
 255         /* only valid after enqueue() */
 256         struct iproc_ctx_s *ctx;
 257
 258         u8 chan_idx;   /* Mailbox channel to be used to submit this request */
 259
 260         /* total todo, rx'd, and sent for this request */
 261         unsigned int total_todo;
 262         unsigned int total_received;    /* only valid for skcipher */
 263         unsigned int total_sent;
 264
 265         /*
 266          * num bytes sent to hw from the src sg in this request. This can differ
 267          * from total_sent for incremental hashing. total_sent includes previous
 268          * init() and update() data. src_sent does not.
 269          */
 270         unsigned int src_sent;
 271
 272         /*
 273          * For AEAD requests, start of associated data. This will typically
 274          * point to the beginning of the src scatterlist from the request,
 275          * since assoc data is at the beginning of the src scatterlist rather
 276          * than in its own sg.
 277          */
 278         struct scatterlist *assoc;
 279
 280         /*
 281          * scatterlist entry and offset to start of data for next chunk. Crypto
 282          * API src scatterlist for AEAD starts with AAD, if present. For first
 283          * chunk, src_sg is sg entry at beginning of input data (after AAD).
 284          * src_skip begins at the offset in that sg entry where data begins.
 285          */
 286         struct scatterlist *src_sg;
 287         int src_nents;          /* Number of src entries with data */
 288         u32 src_skip;           /* bytes of current sg entry already used */
 289
 290         /*
 291          * Same for destination. For AEAD, if there is AAD, output data must
 292          * be written at offset following AAD.
 293          */
 294         struct scatterlist *dst_sg;
 295         int dst_nents;          /* Number of dst entries with data */
 296         u32 dst_skip;           /* bytes of current sg entry already written */
 297
 298         /* Mailbox message used to send this request to PDC driver */
 299         struct brcm_message mb_mssg;
 300
 301         bool bd_suppress;       /* suppress BD field in SPU response? */
 302
 303         /* cipher context */
 304         bool is_encrypt;
 305
 306         /*
 307          * CBC mode: IV.  CTR mode: counter.  Else empty. Used as a DMA
 308          * buffer for AEAD requests. So allocate as DMAable memory. If IV
 309          * concatenated with salt, includes the salt.
 310          */
 311         u8 *iv_ctr;
 312         /* Length of IV or counter, in bytes */
 313         unsigned int iv_ctr_len;
 314
 315         /*
 316          * Hash requests can be of any size, whether initial, update, or final.
 317          * A non-final request must be submitted to the SPU as an integral
 318          * number of blocks. This may leave data at the end of the request
 319          * that is not a full block. Since the request is non-final, it cannot
 320          * be padded. So, we write the remainder to this hash_carry buffer and
 321          * hold it until the next request arrives. The carry data is then
 322          * submitted at the beginning of the data in the next SPU msg.
 323          * hash_carry_len is the number of bytes currently in hash_carry. These
 324          * fields are only used for ahash requests.
 325          */
 326         u8 hash_carry[HASH_CARRY_MAX];
 327         unsigned int hash_carry_len;
 328         unsigned int is_final;  /* is this the final for the hash op? */
 329
 330         /*
 331          * Digest from incremental hash is saved here to include in next hash
 332          * operation. Cannot be stored in req->result for truncated hashes,
 333          * since result may be sized for final digest. Cannot be saved in
 334          * msg_buf because that gets deleted between incremental hash ops
 335          * and is not saved as part of export().
 336          */
 337         u8 incr_hash[MAX_DIGEST_SIZE];
 338
 339         /* hmac context */
 340         bool is_sw_hmac;
 341
 342         /* aead context */
 343         struct crypto_tfm *old_tfm;
 344         crypto_completion_t old_complete;
 345         void *old_data;
 346
 347         gfp_t gfp;
 348
 349         /* Buffers used to build SPU request and response messages */
 350         struct spu_msg_buf msg_buf;
 351 };
 352
 353 /*
 354  * Structure encapsulates a set of function pointers specific to the type of
 355  * SPU hardware running. These functions handling creation and parsing of
 356  * SPU request messages and SPU response messages. Includes hardware-specific
 357  * values read from device tree.
 358  */
 359 struct spu_hw {
 360         void (*spu_dump_msg_hdr)(u8 *buf, unsigned int buf_len);
 361         u32 (*spu_ctx_max_payload)(enum spu_cipher_alg cipher_alg,
 362                                    enum spu_cipher_mode cipher_mode,
 363                                    unsigned int blocksize);
 364         u32 (*spu_payload_length)(u8 *spu_hdr);
 365         u16 (*spu_response_hdr_len)(u16 auth_key_len, u16 enc_key_len,
 366                                     bool is_hash);
 367         u16 (*spu_hash_pad_len)(enum hash_alg hash_alg,
 368                                 enum hash_mode hash_mode, u32 chunksize,
 369                                 u16 hash_block_size);
 370         u32 (*spu_gcm_ccm_pad_len)(enum spu_cipher_mode cipher_mode,
 371                                    unsigned int data_size);
 372         u32 (*spu_assoc_resp_len)(enum spu_cipher_mode cipher_mode,
 373                                   unsigned int assoc_len,
 374                                   unsigned int iv_len, bool is_encrypt);
 375         u8 (*spu_aead_ivlen)(enum spu_cipher_mode cipher_mode,
 376                              u16 iv_len);
 377         enum hash_type (*spu_hash_type)(u32 src_sent);
 378         u32 (*spu_digest_size)(u32 digest_size, enum hash_alg alg,
 379                                enum hash_type);
 380         u32 (*spu_create_request)(u8 *spu_hdr,
 381                                   struct spu_request_opts *req_opts,
 382                                   struct spu_cipher_parms *cipher_parms,
 383                                   struct spu_hash_parms *hash_parms,
 384                                   struct spu_aead_parms *aead_parms,
 385                                   unsigned int data_size);
 386         u16 (*spu_cipher_req_init)(u8 *spu_hdr,
 387                                    struct spu_cipher_parms *cipher_parms);
 388         void (*spu_cipher_req_finish)(u8 *spu_hdr,
 389                                       u16 spu_req_hdr_len,
 390                                       unsigned int is_inbound,
 391                                       struct spu_cipher_parms *cipher_parms,
 392                                       unsigned int data_size);
 393         void (*spu_request_pad)(u8 *pad_start, u32 gcm_padding,
 394                                 u32 hash_pad_len, enum hash_alg auth_alg,
 395                                 enum hash_mode auth_mode,
 396                                 unsigned int total_sent, u32 status_padding);
 397         u8 (*spu_xts_tweak_in_payload)(void);
 398         u8 (*spu_tx_status_len)(void);
 399         u8 (*spu_rx_status_len)(void);
 400         int (*spu_status_process)(u8 *statp);
 401         void (*spu_ccm_update_iv)(unsigned int digestsize,
 402                                   struct spu_cipher_parms *cipher_parms,
 403                                   unsigned int assoclen, unsigned int chunksize,
 404                                   bool is_encrypt, bool is_esp);
 405         u32 (*spu_wordalign_padlen)(u32 data_size);
 406
 407         /* The base virtual address of the SPU hw registers */
 408         void __iomem *reg_vbase[MAX_SPUS];
 409
 410         /* Version of the SPU hardware */
 411         enum spu_spu_type spu_type;
 412
 413         /* Sub-version of the SPU hardware */
 414         enum spu_spu_subtype spu_subtype;
 415
 416         /* The number of SPUs on this platform */
 417         u32 num_spu;
 418
 419         /* The number of SPU channels on this platform */
 420         u32 num_chan;
 421 };
 422
 423 struct device_private {
 424         struct platform_device *pdev;
 425
 426         struct spu_hw spu;
 427
 428         atomic_t session_count; /* number of streams active */
 429         atomic_t stream_count;  /* monotonic counter for streamID's */
 430
 431         /* Length of BCM header. Set to 0 when hw does not expect BCM HEADER. */
 432         u8 bcm_hdr_len;
 433
 434         /* The index of the channel to use for the next crypto request */
 435         atomic_t next_chan;
 436
 437         struct dentry *debugfs_dir;
 438         struct dentry *debugfs_stats;
 439
 440         /* Number of request bytes processed and result bytes returned */
 441         atomic64_t bytes_in;
 442         atomic64_t bytes_out;
 443
 444         /* Number of operations of each type */
 445         atomic_t op_counts[SPU_OP_NUM];
 446
 447         atomic_t cipher_cnt[CIPHER_ALG_LAST][CIPHER_MODE_LAST];
 448         atomic_t hash_cnt[HASH_ALG_LAST];
 449         atomic_t hmac_cnt[HASH_ALG_LAST];
 450         atomic_t aead_cnt[AEAD_TYPE_LAST];
 451
 452         /* Number of calls to setkey() for each operation type */
 453         atomic_t setkey_cnt[SPU_OP_NUM];
 454
 455         /* Number of times request was resubmitted because mb was full */
 456         atomic_t mb_no_spc;
 457
 458         /* Number of mailbox send failures */
 459         atomic_t mb_send_fail;
 460
 461         /* Number of ICV check failures for AEAD messages */
 462         atomic_t bad_icv;
 463
 464         struct mbox_client mcl;
 465
 466         /* Array of mailbox channel pointers, one for each channel */
 467         struct mbox_chan **mbox;
 468 };
 469
 470 extern struct device_private iproc_priv;
 471
 472 #endif