drivers/crypto/caam/desc_constr.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * caam descriptor construction helper functions
   4  *
   5  * Copyright 2008-2012 Freescale Semiconductor, Inc.
   6  * Copyright 2019 NXP
   7  */
   8
   9 #ifndef DESC_CONSTR_H
  10 #define DESC_CONSTR_H
  11
  12 #include "desc.h"
  13 #include "regs.h"
  14
  15 #define IMMEDIATE (1 << 23)
  16 #define CAAM_CMD_SZ sizeof(u32)
  17 #define CAAM_PTR_SZ caam_ptr_sz
  18 #define CAAM_PTR_SZ_MAX sizeof(dma_addr_t)
  19 #define CAAM_PTR_SZ_MIN sizeof(u32)
  20 #define CAAM_DESC_BYTES_MAX (CAAM_CMD_SZ * MAX_CAAM_DESCSIZE)
  21 #define __DESC_JOB_IO_LEN(n) (CAAM_CMD_SZ * 5 + (n) * 3)
  22 #define DESC_JOB_IO_LEN __DESC_JOB_IO_LEN(CAAM_PTR_SZ)
  23 #define DESC_JOB_IO_LEN_MAX __DESC_JOB_IO_LEN(CAAM_PTR_SZ_MAX)
  24 #define DESC_JOB_IO_LEN_MIN __DESC_JOB_IO_LEN(CAAM_PTR_SZ_MIN)
  25
  26 /*
  27  * The CAAM QI hardware constructs a job descriptor which points
  28  * to shared descriptor (as pointed by context_a of FQ to CAAM).
  29  * When the job descriptor is executed by deco, the whole job
  30  * descriptor together with shared descriptor gets loaded in
  31  * deco buffer which is 64 words long (each 32-bit).
  32  *
  33  * The job descriptor constructed by QI hardware has layout:
  34  *
  35  *      HEADER          (1 word)
  36  *      Shdesc ptr      (1 or 2 words)
  37  *      SEQ_OUT_PTR     (1 word)
  38  *      Out ptr         (1 or 2 words)
  39  *      Out length      (1 word)
  40  *      SEQ_IN_PTR      (1 word)
  41  *      In ptr          (1 or 2 words)
  42  *      In length       (1 word)
  43  *
  44  * The shdesc ptr is used to fetch shared descriptor contents
  45  * into deco buffer.
  46  *
  47  * Apart from shdesc contents, the total number of words that
  48  * get loaded in deco buffer are '8' or '11'. The remaining words
  49  * in deco buffer can be used for storing shared descriptor.
  50  */
  51 #define MAX_SDLEN       ((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN_MIN) / CAAM_CMD_SZ)
  52
  53 #ifdef DEBUG
  54 #define PRINT_POS do { printk(KERN_DEBUG "%02d: %s\n", desc_len(desc),\
  55                               &__func__[sizeof("append")]); } while (0)
  56 #else
  57 #define PRINT_POS
  58 #endif
  59
  60 #define SET_OK_NO_PROP_ERRORS (IMMEDIATE | LDST_CLASS_DECO | \
  61                                LDST_SRCDST_WORD_DECOCTRL | \
  62                                (LDOFF_CHG_SHARE_OK_NO_PROP << \
  63                                 LDST_OFFSET_SHIFT))
  64 #define DISABLE_AUTO_INFO_FIFO (IMMEDIATE | LDST_CLASS_DECO | \
  65                                 LDST_SRCDST_WORD_DECOCTRL | \
  66                                 (LDOFF_DISABLE_AUTO_NFIFO << LDST_OFFSET_SHIFT))
  67 #define ENABLE_AUTO_INFO_FIFO (IMMEDIATE | LDST_CLASS_DECO | \
  68                                LDST_SRCDST_WORD_DECOCTRL | \
  69                                (LDOFF_ENABLE_AUTO_NFIFO << LDST_OFFSET_SHIFT))
  70
  71 extern bool caam_little_end;
  72 extern size_t caam_ptr_sz;
  73
  74 /*
  75  * HW fetches 4 S/G table entries at a time, irrespective of how many entries
  76  * are in the table. It's SW's responsibility to make sure these accesses
  77  * do not have side effects.
  78  */
  79 static inline int pad_sg_nents(int sg_nents)
  80 {
  81         return ALIGN(sg_nents, 4);
  82 }
  83
  84 static inline int desc_len(u32 * const desc)
  85 {
  86         return caam32_to_cpu(*desc) & HDR_DESCLEN_MASK;
  87 }
  88
  89 static inline int desc_bytes(void * const desc)
  90 {
  91         return desc_len(desc) * CAAM_CMD_SZ;
  92 }
  93
  94 static inline u32 *desc_end(u32 * const desc)
  95 {
  96         return desc + desc_len(desc);
  97 }
  98
  99 static inline void *sh_desc_pdb(u32 * const desc)
 100 {
 101         return desc + 1;
 102 }
 103
 104 static inline void init_desc(u32 * const desc, u32 options)
 105 {
 106         *desc = cpu_to_caam32((options | HDR_ONE) + 1);
 107 }
 108
 109 static inline void init_sh_desc(u32 * const desc, u32 options)
 110 {
 111         PRINT_POS;
 112         init_desc(desc, CMD_SHARED_DESC_HDR | options);
 113 }
 114
 115 static inline void init_sh_desc_pdb(u32 * const desc, u32 options,
 116                                     size_t pdb_bytes)
 117 {
 118         u32 pdb_len = (pdb_bytes + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ;
 119
 120         init_sh_desc(desc, (((pdb_len + 1) << HDR_START_IDX_SHIFT) + pdb_len) |
 121                      options);
 122 }
 123
 124 static inline void init_job_desc(u32 * const desc, u32 options)
 125 {
 126         init_desc(desc, CMD_DESC_HDR | options);
 127 }
 128
 129 static inline void init_job_desc_pdb(u32 * const desc, u32 options,
 130                                      size_t pdb_bytes)
 131 {
 132         u32 pdb_len = (pdb_bytes + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ;
 133
 134         init_job_desc(desc, (((pdb_len + 1) << HDR_START_IDX_SHIFT)) | options);
 135 }
 136
 137 static inline void append_ptr(u32 * const desc, dma_addr_t ptr)
 138 {
 139         if (caam_ptr_sz == sizeof(dma_addr_t)) {
 140                 dma_addr_t *offset = (dma_addr_t *)desc_end(desc);
 141
 142                 *offset = cpu_to_caam_dma(ptr);
 143         } else {
 144                 u32 *offset = (u32 *)desc_end(desc);
 145
 146                 *offset = cpu_to_caam_dma(ptr);
 147         }
 148
 149         (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) +
 150                                 CAAM_PTR_SZ / CAAM_CMD_SZ);
 151 }
 152
 153 static inline void init_job_desc_shared(u32 * const desc, dma_addr_t ptr,
 154                                         int len, u32 options)
 155 {
 156         PRINT_POS;
 157         init_job_desc(desc, HDR_SHARED | options |
 158                       (len << HDR_START_IDX_SHIFT));
 159         append_ptr(desc, ptr);
 160 }
 161
 162 static inline void append_data(u32 * const desc, const void *data, int len)
 163 {
 164         u32 *offset = desc_end(desc);
 165
 166         /* Avoid gcc warning: memcpy with data == NULL */
 167         if (!IS_ENABLED(CONFIG_CRYPTO_DEV_FSL_CAAM_DEBUG) || data)
 168                 memcpy(offset, data, len);
 169
 170         (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) +
 171                                 (len + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ);
 172 }
 173
 174 static inline void append_cmd(u32 * const desc, u32 command)
 175 {
 176         u32 *cmd = desc_end(desc);
 177
 178         *cmd = cpu_to_caam32(command);
 179
 180         (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + 1);
 181 }
 182
 183 #define append_u32 append_cmd
 184
 185 static inline void append_u64(u32 * const desc, u64 data)
 186 {
 187         u32 *offset = desc_end(desc);
 188
 189         /* Only 32-bit alignment is guaranteed in descriptor buffer */
 190         if (caam_little_end) {
 191                 *offset = cpu_to_caam32(lower_32_bits(data));
 192                 *(++offset) = cpu_to_caam32(upper_32_bits(data));
 193         } else {
 194                 *offset = cpu_to_caam32(upper_32_bits(data));
 195                 *(++offset) = cpu_to_caam32(lower_32_bits(data));
 196         }
 197
 198         (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + 2);
 199 }
 200
 201 /* Write command without affecting header, and return pointer to next word */
 202 static inline u32 *write_cmd(u32 * const desc, u32 command)
 203 {
 204         *desc = cpu_to_caam32(command);
 205
 206         return desc + 1;
 207 }
 208
 209 static inline void append_cmd_ptr(u32 * const desc, dma_addr_t ptr, int len,
 210                                   u32 command)
 211 {
 212         append_cmd(desc, command | len);
 213         append_ptr(desc, ptr);
 214 }
 215
 216 /* Write length after pointer, rather than inside command */
 217 static inline void append_cmd_ptr_extlen(u32 * const desc, dma_addr_t ptr,
 218                                          unsigned int len, u32 command)
 219 {
 220         append_cmd(desc, command);
 221         if (!(command & (SQIN_RTO | SQIN_PRE)))
 222                 append_ptr(desc, ptr);
 223         append_cmd(desc, len);
 224 }
 225
 226 static inline void append_cmd_data(u32 * const desc, const void *data, int len,
 227                                    u32 command)
 228 {
 229         append_cmd(desc, command | IMMEDIATE | len);
 230         append_data(desc, data, len);
 231 }
 232
 233 #define APPEND_CMD_RET(cmd, op) \
 234 static inline u32 *append_##cmd(u32 * const desc, u32 options) \
 235 { \
 236         u32 *cmd = desc_end(desc); \
 237         PRINT_POS; \
 238         append_cmd(desc, CMD_##op | options); \
 239         return cmd; \
 240 }
 241 APPEND_CMD_RET(jump, JUMP)
 242 APPEND_CMD_RET(move, MOVE)
 243 APPEND_CMD_RET(move_len, MOVE_LEN)
 244
 245 static inline void set_jump_tgt_here(u32 * const desc, u32 *jump_cmd)
 246 {
 247         *jump_cmd = cpu_to_caam32(caam32_to_cpu(*jump_cmd) |
 248                                   (desc_len(desc) - (jump_cmd - desc)));
 249 }
 250
 251 static inline void set_move_tgt_here(u32 * const desc, u32 *move_cmd)
 252 {
 253         u32 val = caam32_to_cpu(*move_cmd);
 254
 255         val &= ~MOVE_OFFSET_MASK;
 256         val |= (desc_len(desc) << (MOVE_OFFSET_SHIFT + 2)) & MOVE_OFFSET_MASK;
 257         *move_cmd = cpu_to_caam32(val);
 258 }
 259
 260 #define APPEND_CMD(cmd, op) \
 261 static inline void append_##cmd(u32 * const desc, u32 options) \
 262 { \
 263         PRINT_POS; \
 264         append_cmd(desc, CMD_##op | options); \
 265 }
 266 APPEND_CMD(operation, OPERATION)
 267
 268 #define APPEND_CMD_LEN(cmd, op) \
 269 static inline void append_##cmd(u32 * const desc, unsigned int len, \
 270                                 u32 options) \
 271 { \
 272         PRINT_POS; \
 273         append_cmd(desc, CMD_##op | len | options); \
 274 }
 275
 276 APPEND_CMD_LEN(seq_load, SEQ_LOAD)
 277 APPEND_CMD_LEN(seq_store, SEQ_STORE)
 278 APPEND_CMD_LEN(seq_fifo_load, SEQ_FIFO_LOAD)
 279 APPEND_CMD_LEN(seq_fifo_store, SEQ_FIFO_STORE)
 280
 281 #define APPEND_CMD_PTR(cmd, op) \
 282 static inline void append_##cmd(u32 * const desc, dma_addr_t ptr, \
 283                                 unsigned int len, u32 options) \
 284 { \
 285         PRINT_POS; \
 286         append_cmd_ptr(desc, ptr, len, CMD_##op | options); \
 287 }
 288 APPEND_CMD_PTR(key, KEY)
 289 APPEND_CMD_PTR(load, LOAD)
 290 APPEND_CMD_PTR(fifo_load, FIFO_LOAD)
 291 APPEND_CMD_PTR(fifo_store, FIFO_STORE)
 292
 293 static inline void append_store(u32 * const desc, dma_addr_t ptr,
 294                                 unsigned int len, u32 options)
 295 {
 296         u32 cmd_src;
 297
 298         cmd_src = options & LDST_SRCDST_MASK;
 299
 300         append_cmd(desc, CMD_STORE | options | len);
 301
 302         /* The following options do not require pointer */
 303         if (!(cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED ||
 304               cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB    ||
 305               cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB_WE ||
 306               cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED_WE))
 307                 append_ptr(desc, ptr);
 308 }
 309
 310 #define APPEND_SEQ_PTR_INTLEN(cmd, op) \
 311 static inline void append_seq_##cmd##_ptr_intlen(u32 * const desc, \
 312                                                  dma_addr_t ptr, \
 313                                                  unsigned int len, \
 314                                                  u32 options) \
 315 { \
 316         PRINT_POS; \
 317         if (options & (SQIN_RTO | SQIN_PRE)) \
 318                 append_cmd(desc, CMD_SEQ_##op##_PTR | len | options); \
 319         else \
 320                 append_cmd_ptr(desc, ptr, len, CMD_SEQ_##op##_PTR | options); \
 321 }
 322 APPEND_SEQ_PTR_INTLEN(in, IN)
 323 APPEND_SEQ_PTR_INTLEN(out, OUT)
 324
 325 #define APPEND_CMD_PTR_TO_IMM(cmd, op) \
 326 static inline void append_##cmd##_as_imm(u32 * const desc, const void *data, \
 327                                          unsigned int len, u32 options) \
 328 { \
 329         PRINT_POS; \
 330         append_cmd_data(desc, data, len, CMD_##op | options); \
 331 }
 332 APPEND_CMD_PTR_TO_IMM(load, LOAD);
 333 APPEND_CMD_PTR_TO_IMM(fifo_load, FIFO_LOAD);
 334
 335 #define APPEND_CMD_PTR_EXTLEN(cmd, op) \
 336 static inline void append_##cmd##_extlen(u32 * const desc, dma_addr_t ptr, \
 337                                          unsigned int len, u32 options) \
 338 { \
 339         PRINT_POS; \
 340         append_cmd_ptr_extlen(desc, ptr, len, CMD_##op | SQIN_EXT | options); \
 341 }
 342 APPEND_CMD_PTR_EXTLEN(seq_in_ptr, SEQ_IN_PTR)
 343 APPEND_CMD_PTR_EXTLEN(seq_out_ptr, SEQ_OUT_PTR)
 344
 345 /*
 346  * Determine whether to store length internally or externally depending on
 347  * the size of its type
 348  */
 349 #define APPEND_CMD_PTR_LEN(cmd, op, type) \
 350 static inline void append_##cmd(u32 * const desc, dma_addr_t ptr, \
 351                                 type len, u32 options) \
 352 { \
 353         PRINT_POS; \
 354         if (sizeof(type) > sizeof(u16)) \
 355                 append_##cmd##_extlen(desc, ptr, len, options); \
 356         else \
 357                 append_##cmd##_intlen(desc, ptr, len, options); \
 358 }
 359 APPEND_CMD_PTR_LEN(seq_in_ptr, SEQ_IN_PTR, u32)
 360 APPEND_CMD_PTR_LEN(seq_out_ptr, SEQ_OUT_PTR, u32)
 361
 362 /*
 363  * 2nd variant for commands whose specified immediate length differs
 364  * from length of immediate data provided, e.g., split keys
 365  */
 366 #define APPEND_CMD_PTR_TO_IMM2(cmd, op) \
 367 static inline void append_##cmd##_as_imm(u32 * const desc, const void *data, \
 368                                          unsigned int data_len, \
 369                                          unsigned int len, u32 options) \
 370 { \
 371         PRINT_POS; \
 372         append_cmd(desc, CMD_##op | IMMEDIATE | len | options); \
 373         append_data(desc, data, data_len); \
 374 }
 375 APPEND_CMD_PTR_TO_IMM2(key, KEY);
 376
 377 #define APPEND_CMD_RAW_IMM(cmd, op, type) \
 378 static inline void append_##cmd##_imm_##type(u32 * const desc, type immediate, \
 379                                              u32 options) \
 380 { \
 381         PRINT_POS; \
 382         if (options & LDST_LEN_MASK) \
 383                 append_cmd(desc, CMD_##op | IMMEDIATE | options); \
 384         else \
 385                 append_cmd(desc, CMD_##op | IMMEDIATE | options | \
 386                            sizeof(type)); \
 387         append_cmd(desc, immediate); \
 388 }
 389 APPEND_CMD_RAW_IMM(load, LOAD, u32);
 390
 391 /*
 392  * ee - endianness
 393  * size - size of immediate type in bytes
 394  */
 395 #define APPEND_CMD_RAW_IMM2(cmd, op, ee, size) \
 396 static inline void append_##cmd##_imm_##ee##size(u32 *desc, \
 397                                                    u##size immediate, \
 398                                                    u32 options) \
 399 { \
 400         __##ee##size data = cpu_to_##ee##size(immediate); \
 401         PRINT_POS; \
 402         append_cmd(desc, CMD_##op | IMMEDIATE | options | sizeof(data)); \
 403         append_data(desc, &data, sizeof(data)); \
 404 }
 405
 406 APPEND_CMD_RAW_IMM2(load, LOAD, be, 32);
 407
 408 /*
 409  * Append math command. Only the last part of destination and source need to
 410  * be specified
 411  */
 412 #define APPEND_MATH(op, desc, dest, src_0, src_1, len) \
 413 append_cmd(desc, CMD_MATH | MATH_FUN_##op | MATH_DEST_##dest | \
 414         MATH_SRC0_##src_0 | MATH_SRC1_##src_1 | (u32)len);
 415
 416 #define append_math_add(desc, dest, src0, src1, len) \
 417         APPEND_MATH(ADD, desc, dest, src0, src1, len)
 418 #define append_math_sub(desc, dest, src0, src1, len) \
 419         APPEND_MATH(SUB, desc, dest, src0, src1, len)
 420 #define append_math_add_c(desc, dest, src0, src1, len) \
 421         APPEND_MATH(ADDC, desc, dest, src0, src1, len)
 422 #define append_math_sub_b(desc, dest, src0, src1, len) \
 423         APPEND_MATH(SUBB, desc, dest, src0, src1, len)
 424 #define append_math_and(desc, dest, src0, src1, len) \
 425         APPEND_MATH(AND, desc, dest, src0, src1, len)
 426 #define append_math_or(desc, dest, src0, src1, len) \
 427         APPEND_MATH(OR, desc, dest, src0, src1, len)
 428 #define append_math_xor(desc, dest, src0, src1, len) \
 429         APPEND_MATH(XOR, desc, dest, src0, src1, len)
 430 #define append_math_lshift(desc, dest, src0, src1, len) \
 431         APPEND_MATH(LSHIFT, desc, dest, src0, src1, len)
 432 #define append_math_rshift(desc, dest, src0, src1, len) \
 433         APPEND_MATH(RSHIFT, desc, dest, src0, src1, len)
 434 #define append_math_ldshift(desc, dest, src0, src1, len) \
 435         APPEND_MATH(SHLD, desc, dest, src0, src1, len)
 436
 437 /* Exactly one source is IMM. Data is passed in as u32 value */
 438 #define APPEND_MATH_IMM_u32(op, desc, dest, src_0, src_1, data) \
 439 do { \
 440         APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ); \
 441         append_cmd(desc, data); \
 442 } while (0)
 443
 444 #define append_math_add_imm_u32(desc, dest, src0, src1, data) \
 445         APPEND_MATH_IMM_u32(ADD, desc, dest, src0, src1, data)
 446 #define append_math_sub_imm_u32(desc, dest, src0, src1, data) \
 447         APPEND_MATH_IMM_u32(SUB, desc, dest, src0, src1, data)
 448 #define append_math_add_c_imm_u32(desc, dest, src0, src1, data) \
 449         APPEND_MATH_IMM_u32(ADDC, desc, dest, src0, src1, data)
 450 #define append_math_sub_b_imm_u32(desc, dest, src0, src1, data) \
 451         APPEND_MATH_IMM_u32(SUBB, desc, dest, src0, src1, data)
 452 #define append_math_and_imm_u32(desc, dest, src0, src1, data) \
 453         APPEND_MATH_IMM_u32(AND, desc, dest, src0, src1, data)
 454 #define append_math_or_imm_u32(desc, dest, src0, src1, data) \
 455         APPEND_MATH_IMM_u32(OR, desc, dest, src0, src1, data)
 456 #define append_math_xor_imm_u32(desc, dest, src0, src1, data) \
 457         APPEND_MATH_IMM_u32(XOR, desc, dest, src0, src1, data)
 458 #define append_math_lshift_imm_u32(desc, dest, src0, src1, data) \
 459         APPEND_MATH_IMM_u32(LSHIFT, desc, dest, src0, src1, data)
 460 #define append_math_rshift_imm_u32(desc, dest, src0, src1, data) \
 461         APPEND_MATH_IMM_u32(RSHIFT, desc, dest, src0, src1, data)
 462
 463 /* Exactly one source is IMM. Data is passed in as u64 value */
 464 #define APPEND_MATH_IMM_u64(op, desc, dest, src_0, src_1, data) \
 465 do { \
 466         u32 upper = (data >> 16) >> 16; \
 467         APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ * 2 | \
 468                     (upper ? 0 : MATH_IFB)); \
 469         if (upper) \
 470                 append_u64(desc, data); \
 471         else \
 472                 append_u32(desc, lower_32_bits(data)); \
 473 } while (0)
 474
 475 #define append_math_add_imm_u64(desc, dest, src0, src1, data) \
 476         APPEND_MATH_IMM_u64(ADD, desc, dest, src0, src1, data)
 477 #define append_math_sub_imm_u64(desc, dest, src0, src1, data) \
 478         APPEND_MATH_IMM_u64(SUB, desc, dest, src0, src1, data)
 479 #define append_math_add_c_imm_u64(desc, dest, src0, src1, data) \
 480         APPEND_MATH_IMM_u64(ADDC, desc, dest, src0, src1, data)
 481 #define append_math_sub_b_imm_u64(desc, dest, src0, src1, data) \
 482         APPEND_MATH_IMM_u64(SUBB, desc, dest, src0, src1, data)
 483 #define append_math_and_imm_u64(desc, dest, src0, src1, data) \
 484         APPEND_MATH_IMM_u64(AND, desc, dest, src0, src1, data)
 485 #define append_math_or_imm_u64(desc, dest, src0, src1, data) \
 486         APPEND_MATH_IMM_u64(OR, desc, dest, src0, src1, data)
 487 #define append_math_xor_imm_u64(desc, dest, src0, src1, data) \
 488         APPEND_MATH_IMM_u64(XOR, desc, dest, src0, src1, data)
 489 #define append_math_lshift_imm_u64(desc, dest, src0, src1, data) \
 490         APPEND_MATH_IMM_u64(LSHIFT, desc, dest, src0, src1, data)
 491 #define append_math_rshift_imm_u64(desc, dest, src0, src1, data) \
 492         APPEND_MATH_IMM_u64(RSHIFT, desc, dest, src0, src1, data)
 493
 494 /**
 495  * struct alginfo - Container for algorithm details
 496  * @algtype: algorithm selector; for valid values, see documentation of the
 497  *           functions where it is used.
 498  * @keylen: length of the provided algorithm key, in bytes
 499  * @keylen_pad: padded length of the provided algorithm key, in bytes
 500  * @key_dma: dma (bus) address where algorithm key resides
 501  * @key_virt: virtual address where algorithm key resides
 502  * @key_inline: true - key can be inlined in the descriptor; false - key is
 503  *              referenced by the descriptor
 504  */
 505 struct alginfo {
 506         u32 algtype;
 507         unsigned int keylen;
 508         unsigned int keylen_pad;
 509         dma_addr_t key_dma;
 510         const void *key_virt;
 511         bool key_inline;
 512 };
 513
 514 /**
 515  * desc_inline_query() - Provide indications on which data items can be inlined
 516  *                       and which shall be referenced in a shared descriptor.
 517  * @sd_base_len: Shared descriptor base length - bytes consumed by the commands,
 518  *               excluding the data items to be inlined (or corresponding
 519  *               pointer if an item is not inlined). Each cnstr_* function that
 520  *               generates descriptors should have a define mentioning
 521  *               corresponding length.
 522  * @jd_len: Maximum length of the job descriptor(s) that will be used
 523  *          together with the shared descriptor.
 524  * @data_len: Array of lengths of the data items trying to be inlined
 525  * @inl_mask: 32bit mask with bit x = 1 if data item x can be inlined, 0
 526  *            otherwise.
 527  * @count: Number of data items (size of @data_len array); must be <= 32
 528  *
 529  * Return: 0 if data can be inlined / referenced, negative value if not. If 0,
 530  *         check @inl_mask for details.
 531  */
 532 static inline int desc_inline_query(unsigned int sd_base_len,
 533                                     unsigned int jd_len, unsigned int *data_len,
 534                                     u32 *inl_mask, unsigned int count)
 535 {
 536         int rem_bytes = (int)(CAAM_DESC_BYTES_MAX - sd_base_len - jd_len);
 537         unsigned int i;
 538
 539         *inl_mask = 0;
 540         for (i = 0; (i < count) && (rem_bytes > 0); i++) {
 541                 if (rem_bytes - (int)(data_len[i] +
 542                         (count - i - 1) * CAAM_PTR_SZ) >= 0) {
 543                         rem_bytes -= data_len[i];
 544                         *inl_mask |= (1 << i);
 545                 } else {
 546                         rem_bytes -= CAAM_PTR_SZ;
 547                 }
 548         }
 549
 550         return (rem_bytes >= 0) ? 0 : -1;
 551 }
 552
 553 /**
 554  * append_proto_dkp - Derived Key Protocol (DKP): key -> split key
 555  * @desc: pointer to buffer used for descriptor construction
 556  * @adata: pointer to authentication transform definitions.
 557  *         keylen should be the length of initial key, while keylen_pad
 558  *         the length of the derived (split) key.
 559  *         Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
 560  *         SHA256, SHA384, SHA512}.
 561  */
 562 static inline void append_proto_dkp(u32 * const desc, struct alginfo *adata)
 563 {
 564         u32 protid;
 565
 566         /*
 567          * Quick & dirty translation from OP_ALG_ALGSEL_{MD5, SHA*}
 568          * to OP_PCLID_DKP_{MD5, SHA*}
 569          */
 570         protid = (adata->algtype & OP_ALG_ALGSEL_SUBMASK) |
 571                  (0x20 << OP_ALG_ALGSEL_SHIFT);
 572
 573         if (adata->key_inline) {
 574                 int words;
 575
 576                 if (adata->keylen > adata->keylen_pad) {
 577                         append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 578                                          OP_PCL_DKP_SRC_PTR |
 579                                          OP_PCL_DKP_DST_IMM | adata->keylen);
 580                         append_ptr(desc, adata->key_dma);
 581
 582                         words = (ALIGN(adata->keylen_pad, CAAM_CMD_SZ) -
 583                                  CAAM_PTR_SZ) / CAAM_CMD_SZ;
 584                 } else {
 585                         append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 586                                          OP_PCL_DKP_SRC_IMM |
 587                                          OP_PCL_DKP_DST_IMM | adata->keylen);
 588                         append_data(desc, adata->key_virt, adata->keylen);
 589
 590                         words = (ALIGN(adata->keylen_pad, CAAM_CMD_SZ) -
 591                                  ALIGN(adata->keylen, CAAM_CMD_SZ)) /
 592                                 CAAM_CMD_SZ;
 593                 }
 594
 595                 /* Reserve space in descriptor buffer for the derived key */
 596                 if (words)
 597                         (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + words);
 598         } else {
 599                 append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 600                                  OP_PCL_DKP_SRC_PTR | OP_PCL_DKP_DST_PTR |
 601                                  adata->keylen);
 602                 append_ptr(desc, adata->key_dma);
 603         }
 604 }
 605
 606 #endif /* DESC_CONSTR_H */