LXR linux/drivers/crypto/caam/desc

   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
  71extern bool caam_little_end;
  72extern 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 */
  79static inline int pad_sg_nents(int sg_nents)
  80{
  81        return ALIGN(sg_nents, 4);
  82}
  83
  84static inline int desc_len(u32 * const desc)
  85{
  86        return caam32_to_cpu(*desc) & HDR_DESCLEN_MASK;
  87}
  88
  89static inline int desc_bytes(void * const desc)
  90{
  91        return desc_len(desc) * CAAM_CMD_SZ;
  92}
  93
  94static inline u32 *desc_end(u32 * const desc)
  95{
  96        return desc + desc_len(desc);
  97}
  98
  99static inline void *sh_desc_pdb(u32 * const desc)
 100{
 101        return desc + 1;
 102}
 103
 104static inline void init_desc(u32 * const desc, u32 options)
 105{
 106        *desc = cpu_to_caam32((options | HDR_ONE) + 1);
 107}
 108
 109static 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
 115static 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
 124static inline void init_job_desc(u32 * const desc, u32 options)
 125{
 126        init_desc(desc, CMD_DESC_HDR | options);
 127}
 128
 129static 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
 137static 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
 153static 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
 162static inline void append_data(u32 * const desc, const void *data, int len)
 163{
 164        u32 *offset = desc_end(desc);
 165
 166        if (len) /* avoid sparse warning: memcpy with byte count of 0 */
 167                memcpy(offset, data, len);
 168
 169        (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) +
 170                                (len + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ);
 171}
 172
 173static inline void append_cmd(u32 * const desc, u32 command)
 174{
 175        u32 *cmd = desc_end(desc);
 176
 177        *cmd = cpu_to_caam32(command);
 178
 179        (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + 1);
 180}
 181
 182#define append_u32 append_cmd
 183
 184static inline void append_u64(u32 * const desc, u64 data)
 185{
 186        u32 *offset = desc_end(desc);
 187
 188        /* Only 32-bit alignment is guaranteed in descriptor buffer */
 189        if (caam_little_end) {
 190                *offset = cpu_to_caam32(lower_32_bits(data));
 191                *(++offset) = cpu_to_caam32(upper_32_bits(data));
 192        } else {
 193                *offset = cpu_to_caam32(upper_32_bits(data));
 194                *(++offset) = cpu_to_caam32(lower_32_bits(data));
 195        }
 196
 197        (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + 2);
 198}
 199
 200/* Write command without affecting header, and return pointer to next word */
 201static inline u32 *write_cmd(u32 * const desc, u32 command)
 202{
 203        *desc = cpu_to_caam32(command);
 204
 205        return desc + 1;
 206}
 207
 208static inline void append_cmd_ptr(u32 * const desc, dma_addr_t ptr, int len,
 209                                  u32 command)
 210{
 211        append_cmd(desc, command | len);
 212        append_ptr(desc, ptr);
 213}
 214
 215/* Write length after pointer, rather than inside command */
 216static inline void append_cmd_ptr_extlen(u32 * const desc, dma_addr_t ptr,
 217                                         unsigned int len, u32 command)
 218{
 219        append_cmd(desc, command);
 220        if (!(command & (SQIN_RTO | SQIN_PRE)))
 221                append_ptr(desc, ptr);
 222        append_cmd(desc, len);
 223}
 224
 225static inline void append_cmd_data(u32 * const desc, const void *data, int len,
 226                                   u32 command)
 227{
 228        append_cmd(desc, command | IMMEDIATE | len);
 229        append_data(desc, data, len);
 230}
 231
 232#define APPEND_CMD_RET(cmd, op) \
 233static inline u32 *append_##cmd(u32 * const desc, u32 options) \
 234{ \
 235        u32 *cmd = desc_end(desc); \
 236        PRINT_POS; \
 237        append_cmd(desc, CMD_##op | options); \
 238        return cmd; \
 239}
 240APPEND_CMD_RET(jump, JUMP)
 241APPEND_CMD_RET(move, MOVE)
 242APPEND_CMD_RET(move_len, MOVE_LEN)
 243
 244static inline void set_jump_tgt_here(u32 * const desc, u32 *jump_cmd)
 245{
 246        *jump_cmd = cpu_to_caam32(caam32_to_cpu(*jump_cmd) |
 247                                  (desc_len(desc) - (jump_cmd - desc)));
 248}
 249
 250static inline void set_move_tgt_here(u32 * const desc, u32 *move_cmd)
 251{
 252        u32 val = caam32_to_cpu(*move_cmd);
 253
 254        val &= ~MOVE_OFFSET_MASK;
 255        val |= (desc_len(desc) << (MOVE_OFFSET_SHIFT + 2)) & MOVE_OFFSET_MASK;
 256        *move_cmd = cpu_to_caam32(val);
 257}
 258
 259#define APPEND_CMD(cmd, op) \
 260static inline void append_##cmd(u32 * const desc, u32 options) \
 261{ \
 262        PRINT_POS; \
 263        append_cmd(desc, CMD_##op | options); \
 264}
 265APPEND_CMD(operation, OPERATION)
 266
 267#define APPEND_CMD_LEN(cmd, op) \
 268static inline void append_##cmd(u32 * const desc, unsigned int len, \
 269                                u32 options) \
 270{ \
 271        PRINT_POS; \
 272        append_cmd(desc, CMD_##op | len | options); \
 273}
 274
 275APPEND_CMD_LEN(seq_load, SEQ_LOAD)
 276APPEND_CMD_LEN(seq_store, SEQ_STORE)
 277APPEND_CMD_LEN(seq_fifo_load, SEQ_FIFO_LOAD)
 278APPEND_CMD_LEN(seq_fifo_store, SEQ_FIFO_STORE)
 279
 280#define APPEND_CMD_PTR(cmd, op) \
 281static inline void append_##cmd(u32 * const desc, dma_addr_t ptr, \
 282                                unsigned int len, u32 options) \
 283{ \
 284        PRINT_POS; \
 285        append_cmd_ptr(desc, ptr, len, CMD_##op | options); \
 286}
 287APPEND_CMD_PTR(key, KEY)
 288APPEND_CMD_PTR(load, LOAD)
 289APPEND_CMD_PTR(fifo_load, FIFO_LOAD)
 290APPEND_CMD_PTR(fifo_store, FIFO_STORE)
 291
 292static inline void append_store(u32 * const desc, dma_addr_t ptr,
 293                                unsigned int len, u32 options)
 294{
 295        u32 cmd_src;
 296
 297        cmd_src = options & LDST_SRCDST_MASK;
 298
 299        append_cmd(desc, CMD_STORE | options | len);
 300
 301        /* The following options do not require pointer */
 302        if (!(cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED ||
 303              cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB    ||
 304              cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB_WE ||
 305              cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED_WE))
 306                append_ptr(desc, ptr);
 307}
 308
 309#define APPEND_SEQ_PTR_INTLEN(cmd, op) \
 310static inline void append_seq_##cmd##_ptr_intlen(u32 * const desc, \
 311                                                 dma_addr_t ptr, \
 312                                                 unsigned int len, \
 313                                                 u32 options) \
 314{ \
 315        PRINT_POS; \
 316        if (options & (SQIN_RTO | SQIN_PRE)) \
 317                append_cmd(desc, CMD_SEQ_##op##_PTR | len | options); \
 318        else \
 319                append_cmd_ptr(desc, ptr, len, CMD_SEQ_##op##_PTR | options); \
 320}
 321APPEND_SEQ_PTR_INTLEN(in, IN)
 322APPEND_SEQ_PTR_INTLEN(out, OUT)
 323
 324#define APPEND_CMD_PTR_TO_IMM(cmd, op) \
 325static inline void append_##cmd##_as_imm(u32 * const desc, const void *data, \
 326                                         unsigned int len, u32 options) \
 327{ \
 328        PRINT_POS; \
 329        append_cmd_data(desc, data, len, CMD_##op | options); \
 330}
 331APPEND_CMD_PTR_TO_IMM(load, LOAD);
 332APPEND_CMD_PTR_TO_IMM(fifo_load, FIFO_LOAD);
 333
 334#define APPEND_CMD_PTR_EXTLEN(cmd, op) \
 335static inline void append_##cmd##_extlen(u32 * const desc, dma_addr_t ptr, \
 336                                         unsigned int len, u32 options) \
 337{ \
 338        PRINT_POS; \
 339        append_cmd_ptr_extlen(desc, ptr, len, CMD_##op | SQIN_EXT | options); \
 340}
 341APPEND_CMD_PTR_EXTLEN(seq_in_ptr, SEQ_IN_PTR)
 342APPEND_CMD_PTR_EXTLEN(seq_out_ptr, SEQ_OUT_PTR)
 343
 344/*
 345 * Determine whether to store length internally or externally depending on
 346 * the size of its type
 347 */
 348#define APPEND_CMD_PTR_LEN(cmd, op, type) \
 349static inline void append_##cmd(u32 * const desc, dma_addr_t ptr, \
 350                                type len, u32 options) \
 351{ \
 352        PRINT_POS; \
 353        if (sizeof(type) > sizeof(u16)) \
 354                append_##cmd##_extlen(desc, ptr, len, options); \
 355        else \
 356                append_##cmd##_intlen(desc, ptr, len, options); \
 357}
 358APPEND_CMD_PTR_LEN(seq_in_ptr, SEQ_IN_PTR, u32)
 359APPEND_CMD_PTR_LEN(seq_out_ptr, SEQ_OUT_PTR, u32)
 360
 361/*
 362 * 2nd variant for commands whose specified immediate length differs
 363 * from length of immediate data provided, e.g., split keys
 364 */
 365#define APPEND_CMD_PTR_TO_IMM2(cmd, op) \
 366static inline void append_##cmd##_as_imm(u32 * const desc, const void *data, \
 367                                         unsigned int data_len, \
 368                                         unsigned int len, u32 options) \
 369{ \
 370        PRINT_POS; \
 371        append_cmd(desc, CMD_##op | IMMEDIATE | len | options); \
 372        append_data(desc, data, data_len); \
 373}
 374APPEND_CMD_PTR_TO_IMM2(key, KEY);
 375
 376#define APPEND_CMD_RAW_IMM(cmd, op, type) \
 377static inline void append_##cmd##_imm_##type(u32 * const desc, type immediate, \
 378                                             u32 options) \
 379{ \
 380        PRINT_POS; \
 381        if (options & LDST_LEN_MASK) \
 382                append_cmd(desc, CMD_##op | IMMEDIATE | options); \
 383        else \
 384                append_cmd(desc, CMD_##op | IMMEDIATE | options | \
 385                           sizeof(type)); \
 386        append_cmd(desc, immediate); \
 387}
 388APPEND_CMD_RAW_IMM(load, LOAD, u32);
 389
 390/*
 391 * ee - endianness
 392 * size - size of immediate type in bytes
 393 */
 394#define APPEND_CMD_RAW_IMM2(cmd, op, ee, size) \
 395static inline void append_##cmd##_imm_##ee##size(u32 *desc, \
 396                                                   u##size immediate, \
 397                                                   u32 options) \
 398{ \
 399        __##ee##size data = cpu_to_##ee##size(immediate); \
 400        PRINT_POS; \
 401        append_cmd(desc, CMD_##op | IMMEDIATE | options | sizeof(data)); \
 402        append_data(desc, &data, sizeof(data)); \
 403}
 404
 405APPEND_CMD_RAW_IMM2(load, LOAD, be, 32);
 406
 407/*
 408 * Append math command. Only the last part of destination and source need to
 409 * be specified
 410 */
 411#define APPEND_MATH(op, desc, dest, src_0, src_1, len) \
 412append_cmd(desc, CMD_MATH | MATH_FUN_##op | MATH_DEST_##dest | \
 413        MATH_SRC0_##src_0 | MATH_SRC1_##src_1 | (u32)len);
 414
 415#define append_math_add(desc, dest, src0, src1, len) \
 416        APPEND_MATH(ADD, desc, dest, src0, src1, len)
 417#define append_math_sub(desc, dest, src0, src1, len) \
 418        APPEND_MATH(SUB, desc, dest, src0, src1, len)
 419#define append_math_add_c(desc, dest, src0, src1, len) \
 420        APPEND_MATH(ADDC, desc, dest, src0, src1, len)
 421#define append_math_sub_b(desc, dest, src0, src1, len) \
 422        APPEND_MATH(SUBB, desc, dest, src0, src1, len)
 423#define append_math_and(desc, dest, src0, src1, len) \
 424        APPEND_MATH(AND, desc, dest, src0, src1, len)
 425#define append_math_or(desc, dest, src0, src1, len) \
 426        APPEND_MATH(OR, desc, dest, src0, src1, len)
 427#define append_math_xor(desc, dest, src0, src1, len) \
 428        APPEND_MATH(XOR, desc, dest, src0, src1, len)
 429#define append_math_lshift(desc, dest, src0, src1, len) \
 430        APPEND_MATH(LSHIFT, desc, dest, src0, src1, len)
 431#define append_math_rshift(desc, dest, src0, src1, len) \
 432        APPEND_MATH(RSHIFT, desc, dest, src0, src1, len)
 433#define append_math_ldshift(desc, dest, src0, src1, len) \
 434        APPEND_MATH(SHLD, desc, dest, src0, src1, len)
 435
 436/* Exactly one source is IMM. Data is passed in as u32 value */
 437#define APPEND_MATH_IMM_u32(op, desc, dest, src_0, src_1, data) \
 438do { \
 439        APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ); \
 440        append_cmd(desc, data); \
 441} while (0)
 442
 443#define append_math_add_imm_u32(desc, dest, src0, src1, data) \
 444        APPEND_MATH_IMM_u32(ADD, desc, dest, src0, src1, data)
 445#define append_math_sub_imm_u32(desc, dest, src0, src1, data) \
 446        APPEND_MATH_IMM_u32(SUB, desc, dest, src0, src1, data)
 447#define append_math_add_c_imm_u32(desc, dest, src0, src1, data) \
 448        APPEND_MATH_IMM_u32(ADDC, desc, dest, src0, src1, data)
 449#define append_math_sub_b_imm_u32(desc, dest, src0, src1, data) \
 450        APPEND_MATH_IMM_u32(SUBB, desc, dest, src0, src1, data)
 451#define append_math_and_imm_u32(desc, dest, src0, src1, data) \
 452        APPEND_MATH_IMM_u32(AND, desc, dest, src0, src1, data)
 453#define append_math_or_imm_u32(desc, dest, src0, src1, data) \
 454        APPEND_MATH_IMM_u32(OR, desc, dest, src0, src1, data)
 455#define append_math_xor_imm_u32(desc, dest, src0, src1, data) \
 456        APPEND_MATH_IMM_u32(XOR, desc, dest, src0, src1, data)
 457#define append_math_lshift_imm_u32(desc, dest, src0, src1, data) \
 458        APPEND_MATH_IMM_u32(LSHIFT, desc, dest, src0, src1, data)
 459#define append_math_rshift_imm_u32(desc, dest, src0, src1, data) \
 460        APPEND_MATH_IMM_u32(RSHIFT, desc, dest, src0, src1, data)
 461
 462/* Exactly one source is IMM. Data is passed in as u64 value */
 463#define APPEND_MATH_IMM_u64(op, desc, dest, src_0, src_1, data) \
 464do { \
 465        u32 upper = (data >> 16) >> 16; \
 466        APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ * 2 | \
 467                    (upper ? 0 : MATH_IFB)); \
 468        if (upper) \
 469                append_u64(desc, data); \
 470        else \
 471                append_u32(desc, lower_32_bits(data)); \
 472} while (0)
 473
 474#define append_math_add_imm_u64(desc, dest, src0, src1, data) \
 475        APPEND_MATH_IMM_u64(ADD, desc, dest, src0, src1, data)
 476#define append_math_sub_imm_u64(desc, dest, src0, src1, data) \
 477        APPEND_MATH_IMM_u64(SUB, desc, dest, src0, src1, data)
 478#define append_math_add_c_imm_u64(desc, dest, src0, src1, data) \
 479        APPEND_MATH_IMM_u64(ADDC, desc, dest, src0, src1, data)
 480#define append_math_sub_b_imm_u64(desc, dest, src0, src1, data) \
 481        APPEND_MATH_IMM_u64(SUBB, desc, dest, src0, src1, data)
 482#define append_math_and_imm_u64(desc, dest, src0, src1, data) \
 483        APPEND_MATH_IMM_u64(AND, desc, dest, src0, src1, data)
 484#define append_math_or_imm_u64(desc, dest, src0, src1, data) \
 485        APPEND_MATH_IMM_u64(OR, desc, dest, src0, src1, data)
 486#define append_math_xor_imm_u64(desc, dest, src0, src1, data) \
 487        APPEND_MATH_IMM_u64(XOR, desc, dest, src0, src1, data)
 488#define append_math_lshift_imm_u64(desc, dest, src0, src1, data) \
 489        APPEND_MATH_IMM_u64(LSHIFT, desc, dest, src0, src1, data)
 490#define append_math_rshift_imm_u64(desc, dest, src0, src1, data) \
 491        APPEND_MATH_IMM_u64(RSHIFT, desc, dest, src0, src1, data)
 492
 493/**
 494 * struct alginfo - Container for algorithm details
 495 * @algtype: algorithm selector; for valid values, see documentation of the
 496 *           functions where it is used.
 497 * @keylen: length of the provided algorithm key, in bytes
 498 * @keylen_pad: padded length of the provided algorithm key, in bytes
 499 * @key_dma: dma (bus) address where algorithm key resides
 500 * @key_virt: virtual address where algorithm key resides
 501 * @key_inline: true - key can be inlined in the descriptor; false - key is
 502 *              referenced by the descriptor
 503 */
 504struct alginfo {
 505        u32 algtype;
 506        unsigned int keylen;
 507        unsigned int keylen_pad;
 508        dma_addr_t key_dma;
 509        const void *key_virt;
 510        bool key_inline;
 511};
 512
 513/**
 514 * desc_inline_query() - Provide indications on which data items can be inlined
 515 *                       and which shall be referenced in a shared descriptor.
 516 * @sd_base_len: Shared descriptor base length - bytes consumed by the commands,
 517 *               excluding the data items to be inlined (or corresponding
 518 *               pointer if an item is not inlined). Each cnstr_* function that
 519 *               generates descriptors should have a define mentioning
 520 *               corresponding length.
 521 * @jd_len: Maximum length of the job descriptor(s) that will be used
 522 *          together with the shared descriptor.
 523 * @data_len: Array of lengths of the data items trying to be inlined
 524 * @inl_mask: 32bit mask with bit x = 1 if data item x can be inlined, 0
 525 *            otherwise.
 526 * @count: Number of data items (size of @data_len array); must be <= 32
 527 *
 528 * Return: 0 if data can be inlined / referenced, negative value if not. If 0,
 529 *         check @inl_mask for details.
 530 */
 531static inline int desc_inline_query(unsigned int sd_base_len,
 532                                    unsigned int jd_len, unsigned int *data_len,
 533                                    u32 *inl_mask, unsigned int count)
 534{
 535        int rem_bytes = (int)(CAAM_DESC_BYTES_MAX - sd_base_len - jd_len);
 536        unsigned int i;
 537
 538        *inl_mask = 0;
 539        for (i = 0; (i < count) && (rem_bytes > 0); i++) {
 540                if (rem_bytes - (int)(data_len[i] +
 541                        (count - i - 1) * CAAM_PTR_SZ) >= 0) {
 542                        rem_bytes -= data_len[i];
 543                        *inl_mask |= (1 << i);
 544                } else {
 545                        rem_bytes -= CAAM_PTR_SZ;
 546                }
 547        }
 548
 549        return (rem_bytes >= 0) ? 0 : -1;
 550}
 551
 552/**
 553 * append_proto_dkp - Derived Key Protocol (DKP): key -> split key
 554 * @desc: pointer to buffer used for descriptor construction
 555 * @adata: pointer to authentication transform definitions.
 556 *         keylen should be the length of initial key, while keylen_pad
 557 *         the length of the derived (split) key.
 558 *         Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
 559 *         SHA256, SHA384, SHA512}.
 560 */
 561static inline void append_proto_dkp(u32 * const desc, struct alginfo *adata)
 562{
 563        u32 protid;
 564
 565        /*
 566         * Quick & dirty translation from OP_ALG_ALGSEL_{MD5, SHA*}
 567         * to OP_PCLID_DKP_{MD5, SHA*}
 568         */
 569        protid = (adata->algtype & OP_ALG_ALGSEL_SUBMASK) |
 570                 (0x20 << OP_ALG_ALGSEL_SHIFT);
 571
 572        if (adata->key_inline) {
 573                int words;
 574
 575                if (adata->keylen > adata->keylen_pad) {
 576                        append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 577                                         OP_PCL_DKP_SRC_PTR |
 578                                         OP_PCL_DKP_DST_IMM | adata->keylen);
 579                        append_ptr(desc, adata->key_dma);
 580
 581                        words = (ALIGN(adata->keylen_pad, CAAM_CMD_SZ) -
 582                                 CAAM_PTR_SZ) / CAAM_CMD_SZ;
 583                } else {
 584                        append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 585                                         OP_PCL_DKP_SRC_IMM |
 586                                         OP_PCL_DKP_DST_IMM | adata->keylen);
 587                        append_data(desc, adata->key_virt, adata->keylen);
 588
 589                        words = (ALIGN(adata->keylen_pad, CAAM_CMD_SZ) -
 590                                 ALIGN(adata->keylen, CAAM_CMD_SZ)) /
 591                                CAAM_CMD_SZ;
 592                }
 593
 594                /* Reserve space in descriptor buffer for the derived key */
 595                if (words)
 596                        (*desc) = cpu_to_caam32(caam32_to_cpu(*desc) + words);
 597        } else {
 598                append_operation(desc, OP_TYPE_UNI_PROTOCOL | protid |
 599                                 OP_PCL_DKP_SRC_PTR | OP_PCL_DKP_DST_PTR |
 600                                 adata->keylen);
 601                append_ptr(desc, adata->key_dma);
 602        }
 603}
 604
 605#endif /* DESC_CONSTR_H */
 606