1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AMD Cryptographic Coprocessor (CCP) driver 4 * 5 * Copyright (C) 2013,2017 Advanced Micro Devices, Inc. 6 * 7 * Author: Tom Lendacky <thomas.lendacky@amd.com> 8 * Author: Gary R Hook <gary.hook@amd.com> 9 */ 10 11 #ifndef __CCP_DEV_H__ 12 #define __CCP_DEV_H__ 13 14 #include <linux/device.h> 15 #include <linux/spinlock.h> 16 #include <linux/mutex.h> 17 #include <linux/list.h> 18 #include <linux/wait.h> 19 #include <linux/dma-direction.h> 20 #include <linux/dmapool.h> 21 #include <linux/hw_random.h> 22 #include <linux/bitops.h> 23 #include <linux/interrupt.h> 24 #include <linux/irqreturn.h> 25 #include <linux/dmaengine.h> 26 27 #include "sp-dev.h" 28 29 #define MAX_CCP_NAME_LEN 16 30 #define MAX_DMAPOOL_NAME_LEN 32 31 32 #define MAX_HW_QUEUES 5 33 #define MAX_CMD_QLEN 100 34 35 #define TRNG_RETRIES 10 36 37 #define CACHE_NONE 0x00 38 #define CACHE_WB_NO_ALLOC 0xb7 39 40 /****** Register Mappings ******/ 41 #define Q_MASK_REG 0x000 42 #define TRNG_OUT_REG 0x00c 43 #define IRQ_MASK_REG 0x040 44 #define IRQ_STATUS_REG 0x200 45 46 #define DEL_CMD_Q_JOB 0x124 47 #define DEL_Q_ACTIVE 0x00000200 48 #define DEL_Q_ID_SHIFT 6 49 50 #define CMD_REQ0 0x180 51 #define CMD_REQ_INCR 0x04 52 53 #define CMD_Q_STATUS_BASE 0x210 54 #define CMD_Q_INT_STATUS_BASE 0x214 55 #define CMD_Q_STATUS_INCR 0x20 56 57 #define CMD_Q_CACHE_BASE 0x228 58 #define CMD_Q_CACHE_INC 0x20 59 60 #define CMD_Q_ERROR(__qs) ((__qs) & 0x0000003f) 61 #define CMD_Q_DEPTH(__qs) (((__qs) >> 12) & 0x0000000f) 62 63 /* ------------------------ CCP Version 5 Specifics ------------------------ */ 64 #define CMD5_QUEUE_MASK_OFFSET 0x00 65 #define CMD5_QUEUE_PRIO_OFFSET 0x04 66 #define CMD5_REQID_CONFIG_OFFSET 0x08 67 #define CMD5_CMD_TIMEOUT_OFFSET 0x10 68 #define LSB_PUBLIC_MASK_LO_OFFSET 0x18 69 #define LSB_PUBLIC_MASK_HI_OFFSET 0x1C 70 #define LSB_PRIVATE_MASK_LO_OFFSET 0x20 71 #define LSB_PRIVATE_MASK_HI_OFFSET 0x24 72 #define CMD5_PSP_CCP_VERSION 0x100 73 74 #define CMD5_Q_CONTROL_BASE 0x0000 75 #define CMD5_Q_TAIL_LO_BASE 0x0004 76 #define CMD5_Q_HEAD_LO_BASE 0x0008 77 #define CMD5_Q_INT_ENABLE_BASE 0x000C 78 #define CMD5_Q_INTERRUPT_STATUS_BASE 0x0010 79 80 #define CMD5_Q_STATUS_BASE 0x0100 81 #define CMD5_Q_INT_STATUS_BASE 0x0104 82 #define CMD5_Q_DMA_STATUS_BASE 0x0108 83 #define CMD5_Q_DMA_READ_STATUS_BASE 0x010C 84 #define CMD5_Q_DMA_WRITE_STATUS_BASE 0x0110 85 #define CMD5_Q_ABORT_BASE 0x0114 86 #define CMD5_Q_AX_CACHE_BASE 0x0118 87 88 #define CMD5_CONFIG_0_OFFSET 0x6000 89 #define CMD5_TRNG_CTL_OFFSET 0x6008 90 #define CMD5_AES_MASK_OFFSET 0x6010 91 #define CMD5_CLK_GATE_CTL_OFFSET 0x603C 92 93 /* Address offset between two virtual queue registers */ 94 #define CMD5_Q_STATUS_INCR 0x1000 95 96 /* Bit masks */ 97 #define CMD5_Q_RUN 0x1 98 #define CMD5_Q_HALT 0x2 99 #define CMD5_Q_MEM_LOCATION 0x4 100 #define CMD5_Q_SIZE 0x1F 101 #define CMD5_Q_SHIFT 3 102 #define COMMANDS_PER_QUEUE 16 103 #define QUEUE_SIZE_VAL ((ffs(COMMANDS_PER_QUEUE) - 2) & \ 104 CMD5_Q_SIZE) 105 #define Q_PTR_MASK (2 << (QUEUE_SIZE_VAL + 5) - 1) 106 #define Q_DESC_SIZE sizeof(struct ccp5_desc) 107 #define Q_SIZE(n) (COMMANDS_PER_QUEUE*(n)) 108 109 #define INT_COMPLETION 0x1 110 #define INT_ERROR 0x2 111 #define INT_QUEUE_STOPPED 0x4 112 #define INT_EMPTY_QUEUE 0x8 113 #define SUPPORTED_INTERRUPTS (INT_COMPLETION | INT_ERROR) 114 115 #define LSB_REGION_WIDTH 5 116 #define MAX_LSB_CNT 8 117 118 #define LSB_SIZE 16 119 #define LSB_ITEM_SIZE 32 120 #define PLSB_MAP_SIZE (LSB_SIZE) 121 #define SLSB_MAP_SIZE (MAX_LSB_CNT * LSB_SIZE) 122 123 #define LSB_ENTRY_NUMBER(LSB_ADDR) (LSB_ADDR / LSB_ITEM_SIZE) 124 125 /* ------------------------ CCP Version 3 Specifics ------------------------ */ 126 #define REQ0_WAIT_FOR_WRITE 0x00000004 127 #define REQ0_INT_ON_COMPLETE 0x00000002 128 #define REQ0_STOP_ON_COMPLETE 0x00000001 129 130 #define REQ0_CMD_Q_SHIFT 9 131 #define REQ0_JOBID_SHIFT 3 132 133 /****** REQ1 Related Values ******/ 134 #define REQ1_PROTECT_SHIFT 27 135 #define REQ1_ENGINE_SHIFT 23 136 #define REQ1_KEY_KSB_SHIFT 2 137 138 #define REQ1_EOM 0x00000002 139 #define REQ1_INIT 0x00000001 140 141 /* AES Related Values */ 142 #define REQ1_AES_TYPE_SHIFT 21 143 #define REQ1_AES_MODE_SHIFT 18 144 #define REQ1_AES_ACTION_SHIFT 17 145 #define REQ1_AES_CFB_SIZE_SHIFT 10 146 147 /* XTS-AES Related Values */ 148 #define REQ1_XTS_AES_SIZE_SHIFT 10 149 150 /* SHA Related Values */ 151 #define REQ1_SHA_TYPE_SHIFT 21 152 153 /* RSA Related Values */ 154 #define REQ1_RSA_MOD_SIZE_SHIFT 10 155 156 /* Pass-Through Related Values */ 157 #define REQ1_PT_BW_SHIFT 12 158 #define REQ1_PT_BS_SHIFT 10 159 160 /* ECC Related Values */ 161 #define REQ1_ECC_AFFINE_CONVERT 0x00200000 162 #define REQ1_ECC_FUNCTION_SHIFT 18 163 164 /****** REQ4 Related Values ******/ 165 #define REQ4_KSB_SHIFT 18 166 #define REQ4_MEMTYPE_SHIFT 16 167 168 /****** REQ6 Related Values ******/ 169 #define REQ6_MEMTYPE_SHIFT 16 170 171 /****** Key Storage Block ******/ 172 #define KSB_START 77 173 #define KSB_END 127 174 #define KSB_COUNT (KSB_END - KSB_START + 1) 175 #define CCP_SB_BITS 256 176 177 #define CCP_JOBID_MASK 0x0000003f 178 179 /* ------------------------ General CCP Defines ------------------------ */ 180 181 #define CCP_DMA_DFLT 0x0 182 #define CCP_DMA_PRIV 0x1 183 #define CCP_DMA_PUB 0x2 184 185 #define CCP_DMAPOOL_MAX_SIZE 64 186 #define CCP_DMAPOOL_ALIGN BIT(5) 187 188 #define CCP_REVERSE_BUF_SIZE 64 189 190 #define CCP_AES_KEY_SB_COUNT 1 191 #define CCP_AES_CTX_SB_COUNT 1 192 193 #define CCP_XTS_AES_KEY_SB_COUNT 1 194 #define CCP5_XTS_AES_KEY_SB_COUNT 2 195 #define CCP_XTS_AES_CTX_SB_COUNT 1 196 197 #define CCP_DES3_KEY_SB_COUNT 1 198 #define CCP_DES3_CTX_SB_COUNT 1 199 200 #define CCP_SHA_SB_COUNT 1 201 202 #define CCP_RSA_MAX_WIDTH 4096 203 #define CCP5_RSA_MAX_WIDTH 16384 204 205 #define CCP_PASSTHRU_BLOCKSIZE 256 206 #define CCP_PASSTHRU_MASKSIZE 32 207 #define CCP_PASSTHRU_SB_COUNT 1 208 209 #define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */ 210 #define CCP_ECC_MAX_OPERANDS 6 211 #define CCP_ECC_MAX_OUTPUTS 3 212 #define CCP_ECC_SRC_BUF_SIZE 448 213 #define CCP_ECC_DST_BUF_SIZE 192 214 #define CCP_ECC_OPERAND_SIZE 64 215 #define CCP_ECC_OUTPUT_SIZE 64 216 #define CCP_ECC_RESULT_OFFSET 60 217 #define CCP_ECC_RESULT_SUCCESS 0x0001 218 219 #define CCP_SB_BYTES 32 220 221 struct ccp_op; 222 struct ccp_device; 223 struct ccp_cmd; 224 struct ccp_fns; 225 226 struct ccp_dma_cmd { 227 struct list_head entry; 228 229 struct ccp_cmd ccp_cmd; 230 }; 231 232 struct ccp_dma_desc { 233 struct list_head entry; 234 235 struct ccp_device *ccp; 236 237 struct list_head pending; 238 struct list_head active; 239 240 enum dma_status status; 241 struct dma_async_tx_descriptor tx_desc; 242 size_t len; 243 }; 244 245 struct ccp_dma_chan { 246 struct ccp_device *ccp; 247 248 spinlock_t lock; 249 struct list_head created; 250 struct list_head pending; 251 struct list_head active; 252 struct list_head complete; 253 254 struct tasklet_struct cleanup_tasklet; 255 256 enum dma_status status; 257 struct dma_chan dma_chan; 258 }; 259 260 struct ccp_cmd_queue { 261 struct ccp_device *ccp; 262 263 /* Queue identifier */ 264 u32 id; 265 266 /* Queue dma pool */ 267 struct dma_pool *dma_pool; 268 269 /* Queue base address (not neccessarily aligned)*/ 270 struct ccp5_desc *qbase; 271 272 /* Aligned queue start address (per requirement) */ 273 struct mutex q_mutex ____cacheline_aligned; 274 unsigned int qidx; 275 276 /* Version 5 has different requirements for queue memory */ 277 unsigned int qsize; 278 dma_addr_t qbase_dma; 279 dma_addr_t qdma_tail; 280 281 /* Per-queue reserved storage block(s) */ 282 u32 sb_key; 283 u32 sb_ctx; 284 285 /* Bitmap of LSBs that can be accessed by this queue */ 286 DECLARE_BITMAP(lsbmask, MAX_LSB_CNT); 287 /* Private LSB that is assigned to this queue, or -1 if none. 288 * Bitmap for my private LSB, unused otherwise 289 */ 290 int lsb; 291 DECLARE_BITMAP(lsbmap, PLSB_MAP_SIZE); 292 293 /* Queue processing thread */ 294 struct task_struct *kthread; 295 unsigned int active; 296 unsigned int suspended; 297 298 /* Number of free command slots available */ 299 unsigned int free_slots; 300 301 /* Interrupt masks */ 302 u32 int_ok; 303 u32 int_err; 304 305 /* Register addresses for queue */ 306 void __iomem *reg_control; 307 void __iomem *reg_tail_lo; 308 void __iomem *reg_head_lo; 309 void __iomem *reg_int_enable; 310 void __iomem *reg_interrupt_status; 311 void __iomem *reg_status; 312 void __iomem *reg_int_status; 313 void __iomem *reg_dma_status; 314 void __iomem *reg_dma_read_status; 315 void __iomem *reg_dma_write_status; 316 u32 qcontrol; /* Cached control register */ 317 318 /* Status values from job */ 319 u32 int_status; 320 u32 q_status; 321 u32 q_int_status; 322 u32 cmd_error; 323 324 /* Interrupt wait queue */ 325 wait_queue_head_t int_queue; 326 unsigned int int_rcvd; 327 328 /* Per-queue Statistics */ 329 unsigned long total_ops; 330 unsigned long total_aes_ops; 331 unsigned long total_xts_aes_ops; 332 unsigned long total_3des_ops; 333 unsigned long total_sha_ops; 334 unsigned long total_rsa_ops; 335 unsigned long total_pt_ops; 336 unsigned long total_ecc_ops; 337 } ____cacheline_aligned; 338 339 struct ccp_device { 340 struct list_head entry; 341 342 struct ccp_vdata *vdata; 343 unsigned int ord; 344 char name[MAX_CCP_NAME_LEN]; 345 char rngname[MAX_CCP_NAME_LEN]; 346 347 struct device *dev; 348 struct sp_device *sp; 349 350 /* Bus specific device information 351 */ 352 void *dev_specific; 353 unsigned int qim; 354 unsigned int irq; 355 bool use_tasklet; 356 struct tasklet_struct irq_tasklet; 357 358 /* I/O area used for device communication. The register mapping 359 * starts at an offset into the mapped bar. 360 * The CMD_REQx registers and the Delete_Cmd_Queue_Job register 361 * need to be protected while a command queue thread is accessing 362 * them. 363 */ 364 struct mutex req_mutex ____cacheline_aligned; 365 void __iomem *io_regs; 366 367 /* Master lists that all cmds are queued on. Because there can be 368 * more than one CCP command queue that can process a cmd a separate 369 * backlog list is needed so that the backlog completion call 370 * completes before the cmd is available for execution. 371 */ 372 spinlock_t cmd_lock ____cacheline_aligned; 373 unsigned int cmd_count; 374 struct list_head cmd; 375 struct list_head backlog; 376 377 /* The command queues. These represent the queues available on the 378 * CCP that are available for processing cmds 379 */ 380 struct ccp_cmd_queue cmd_q[MAX_HW_QUEUES]; 381 unsigned int cmd_q_count; 382 unsigned int max_q_count; 383 384 /* Support for the CCP True RNG 385 */ 386 struct hwrng hwrng; 387 unsigned int hwrng_retries; 388 389 /* Support for the CCP DMA capabilities 390 */ 391 struct dma_device dma_dev; 392 struct ccp_dma_chan *ccp_dma_chan; 393 struct kmem_cache *dma_cmd_cache; 394 struct kmem_cache *dma_desc_cache; 395 396 /* A counter used to generate job-ids for cmds submitted to the CCP 397 */ 398 atomic_t current_id ____cacheline_aligned; 399 400 /* The v3 CCP uses key storage blocks (SB) to maintain context for 401 * certain operations. To prevent multiple cmds from using the same 402 * SB range a command queue reserves an SB range for the duration of 403 * the cmd. Each queue, will however, reserve 2 SB blocks for 404 * operations that only require single SB entries (eg. AES context/iv 405 * and key) in order to avoid allocation contention. This will reserve 406 * at most 10 SB entries, leaving 40 SB entries available for dynamic 407 * allocation. 408 * 409 * The v5 CCP Local Storage Block (LSB) is broken up into 8 410 * memrory ranges, each of which can be enabled for access by one 411 * or more queues. Device initialization takes this into account, 412 * and attempts to assign one region for exclusive use by each 413 * available queue; the rest are then aggregated as "public" use. 414 * If there are fewer regions than queues, all regions are shared 415 * amongst all queues. 416 */ 417 struct mutex sb_mutex ____cacheline_aligned; 418 DECLARE_BITMAP(sb, KSB_COUNT); 419 wait_queue_head_t sb_queue; 420 unsigned int sb_avail; 421 unsigned int sb_count; 422 u32 sb_start; 423 424 /* Bitmap of shared LSBs, if any */ 425 DECLARE_BITMAP(lsbmap, SLSB_MAP_SIZE); 426 427 /* Suspend support */ 428 unsigned int suspending; 429 wait_queue_head_t suspend_queue; 430 431 /* DMA caching attribute support */ 432 unsigned int axcache; 433 434 /* Device Statistics */ 435 unsigned long total_interrupts; 436 437 /* DebugFS info */ 438 struct dentry *debugfs_instance; 439 }; 440 441 enum ccp_memtype { 442 CCP_MEMTYPE_SYSTEM = 0, 443 CCP_MEMTYPE_SB, 444 CCP_MEMTYPE_LOCAL, 445 CCP_MEMTYPE__LAST, 446 }; 447 #define CCP_MEMTYPE_LSB CCP_MEMTYPE_KSB 448 449 450 struct ccp_dma_info { 451 dma_addr_t address; 452 unsigned int offset; 453 unsigned int length; 454 enum dma_data_direction dir; 455 } __packed __aligned(4); 456 457 struct ccp_dm_workarea { 458 struct device *dev; 459 struct dma_pool *dma_pool; 460 461 u8 *address; 462 struct ccp_dma_info dma; 463 unsigned int length; 464 }; 465 466 struct ccp_sg_workarea { 467 struct scatterlist *sg; 468 int nents; 469 unsigned int sg_used; 470 471 struct scatterlist *dma_sg; 472 struct scatterlist *dma_sg_head; 473 struct device *dma_dev; 474 unsigned int dma_count; 475 enum dma_data_direction dma_dir; 476 477 u64 bytes_left; 478 }; 479 480 struct ccp_data { 481 struct ccp_sg_workarea sg_wa; 482 struct ccp_dm_workarea dm_wa; 483 }; 484 485 struct ccp_mem { 486 enum ccp_memtype type; 487 union { 488 struct ccp_dma_info dma; 489 u32 sb; 490 } u; 491 }; 492 493 struct ccp_aes_op { 494 enum ccp_aes_type type; 495 enum ccp_aes_mode mode; 496 enum ccp_aes_action action; 497 unsigned int size; 498 }; 499 500 struct ccp_xts_aes_op { 501 enum ccp_aes_type type; 502 enum ccp_aes_action action; 503 enum ccp_xts_aes_unit_size unit_size; 504 }; 505 506 struct ccp_des3_op { 507 enum ccp_des3_type type; 508 enum ccp_des3_mode mode; 509 enum ccp_des3_action action; 510 }; 511 512 struct ccp_sha_op { 513 enum ccp_sha_type type; 514 u64 msg_bits; 515 }; 516 517 struct ccp_rsa_op { 518 u32 mod_size; 519 u32 input_len; 520 }; 521 522 struct ccp_passthru_op { 523 enum ccp_passthru_bitwise bit_mod; 524 enum ccp_passthru_byteswap byte_swap; 525 }; 526 527 struct ccp_ecc_op { 528 enum ccp_ecc_function function; 529 }; 530 531 struct ccp_op { 532 struct ccp_cmd_queue *cmd_q; 533 534 u32 jobid; 535 u32 ioc; 536 u32 soc; 537 u32 sb_key; 538 u32 sb_ctx; 539 u32 init; 540 u32 eom; 541 542 struct ccp_mem src; 543 struct ccp_mem dst; 544 struct ccp_mem exp; 545 546 union { 547 struct ccp_aes_op aes; 548 struct ccp_xts_aes_op xts; 549 struct ccp_des3_op des3; 550 struct ccp_sha_op sha; 551 struct ccp_rsa_op rsa; 552 struct ccp_passthru_op passthru; 553 struct ccp_ecc_op ecc; 554 } u; 555 }; 556 ccp_addr_lo(struct ccp_dma_info * info)557 static inline u32 ccp_addr_lo(struct ccp_dma_info *info) 558 { 559 return lower_32_bits(info->address + info->offset); 560 } 561 ccp_addr_hi(struct ccp_dma_info * info)562 static inline u32 ccp_addr_hi(struct ccp_dma_info *info) 563 { 564 return upper_32_bits(info->address + info->offset) & 0x0000ffff; 565 } 566 567 /** 568 * descriptor for version 5 CPP commands 569 * 8 32-bit words: 570 * word 0: function; engine; control bits 571 * word 1: length of source data 572 * word 2: low 32 bits of source pointer 573 * word 3: upper 16 bits of source pointer; source memory type 574 * word 4: low 32 bits of destination pointer 575 * word 5: upper 16 bits of destination pointer; destination memory type 576 * word 6: low 32 bits of key pointer 577 * word 7: upper 16 bits of key pointer; key memory type 578 */ 579 struct dword0 { 580 unsigned int soc:1; 581 unsigned int ioc:1; 582 unsigned int rsvd1:1; 583 unsigned int init:1; 584 unsigned int eom:1; /* AES/SHA only */ 585 unsigned int function:15; 586 unsigned int engine:4; 587 unsigned int prot:1; 588 unsigned int rsvd2:7; 589 }; 590 591 struct dword3 { 592 unsigned int src_hi:16; 593 unsigned int src_mem:2; 594 unsigned int lsb_cxt_id:8; 595 unsigned int rsvd1:5; 596 unsigned int fixed:1; 597 }; 598 599 union dword4 { 600 u32 dst_lo; /* NON-SHA */ 601 u32 sha_len_lo; /* SHA */ 602 }; 603 604 union dword5 { 605 struct { 606 unsigned int dst_hi:16; 607 unsigned int dst_mem:2; 608 unsigned int rsvd1:13; 609 unsigned int fixed:1; 610 } fields; 611 u32 sha_len_hi; 612 }; 613 614 struct dword7 { 615 unsigned int key_hi:16; 616 unsigned int key_mem:2; 617 unsigned int rsvd1:14; 618 }; 619 620 struct ccp5_desc { 621 struct dword0 dw0; 622 u32 length; 623 u32 src_lo; 624 struct dword3 dw3; 625 union dword4 dw4; 626 union dword5 dw5; 627 u32 key_lo; 628 struct dword7 dw7; 629 }; 630 631 void ccp_add_device(struct ccp_device *ccp); 632 void ccp_del_device(struct ccp_device *ccp); 633 634 extern void ccp_log_error(struct ccp_device *, unsigned int); 635 636 struct ccp_device *ccp_alloc_struct(struct sp_device *sp); 637 bool ccp_queues_suspended(struct ccp_device *ccp); 638 int ccp_cmd_queue_thread(void *data); 639 int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait); 640 641 int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd); 642 643 int ccp_register_rng(struct ccp_device *ccp); 644 void ccp_unregister_rng(struct ccp_device *ccp); 645 int ccp_dmaengine_register(struct ccp_device *ccp); 646 void ccp_dmaengine_unregister(struct ccp_device *ccp); 647 648 void ccp5_debugfs_setup(struct ccp_device *ccp); 649 void ccp5_debugfs_destroy(void); 650 651 /* Structure for computation functions that are device-specific */ 652 struct ccp_actions { 653 int (*aes)(struct ccp_op *); 654 int (*xts_aes)(struct ccp_op *); 655 int (*des3)(struct ccp_op *); 656 int (*sha)(struct ccp_op *); 657 int (*rsa)(struct ccp_op *); 658 int (*passthru)(struct ccp_op *); 659 int (*ecc)(struct ccp_op *); 660 u32 (*sballoc)(struct ccp_cmd_queue *, unsigned int); 661 void (*sbfree)(struct ccp_cmd_queue *, unsigned int, unsigned int); 662 unsigned int (*get_free_slots)(struct ccp_cmd_queue *); 663 int (*init)(struct ccp_device *); 664 void (*destroy)(struct ccp_device *); 665 irqreturn_t (*irqhandler)(int, void *); 666 }; 667 668 extern const struct ccp_vdata ccpv3_platform; 669 extern const struct ccp_vdata ccpv3; 670 extern const struct ccp_vdata ccpv5a; 671 extern const struct ccp_vdata ccpv5b; 672 673 #endif 674