1 /* 2 * AMD Platform Security Processor (PSP) interface 3 * 4 * Copyright (C) 2016-2017 Advanced Micro Devices, Inc. 5 * 6 * Author: Brijesh Singh <brijesh.singh@amd.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/kthread.h> 16 #include <linux/sched.h> 17 #include <linux/interrupt.h> 18 #include <linux/spinlock.h> 19 #include <linux/spinlock_types.h> 20 #include <linux/types.h> 21 #include <linux/mutex.h> 22 #include <linux/delay.h> 23 #include <linux/hw_random.h> 24 #include <linux/ccp.h> 25 #include <linux/firmware.h> 26 27 #include "sp-dev.h" 28 #include "psp-dev.h" 29 30 #define SEV_VERSION_GREATER_OR_EQUAL(_maj, _min) \ 31 ((psp_master->api_major) >= _maj && \ 32 (psp_master->api_minor) >= _min) 33 34 #define DEVICE_NAME "sev" 35 #define SEV_FW_FILE "amd/sev.fw" 36 37 static DEFINE_MUTEX(sev_cmd_mutex); 38 static struct sev_misc_dev *misc_dev; 39 static struct psp_device *psp_master; 40 41 static struct psp_device *psp_alloc_struct(struct sp_device *sp) 42 { 43 struct device *dev = sp->dev; 44 struct psp_device *psp; 45 46 psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL); 47 if (!psp) 48 return NULL; 49 50 psp->dev = dev; 51 psp->sp = sp; 52 53 snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord); 54 55 return psp; 56 } 57 58 static irqreturn_t psp_irq_handler(int irq, void *data) 59 { 60 struct psp_device *psp = data; 61 unsigned int status; 62 int reg; 63 64 /* Read the interrupt status: */ 65 status = ioread32(psp->io_regs + PSP_P2CMSG_INTSTS); 66 67 /* Check if it is command completion: */ 68 if (!(status & BIT(PSP_CMD_COMPLETE_REG))) 69 goto done; 70 71 /* Check if it is SEV command completion: */ 72 reg = ioread32(psp->io_regs + PSP_CMDRESP); 73 if (reg & PSP_CMDRESP_RESP) { 74 psp->sev_int_rcvd = 1; 75 wake_up(&psp->sev_int_queue); 76 } 77 78 done: 79 /* Clear the interrupt status by writing the same value we read. */ 80 iowrite32(status, psp->io_regs + PSP_P2CMSG_INTSTS); 81 82 return IRQ_HANDLED; 83 } 84 85 static void sev_wait_cmd_ioc(struct psp_device *psp, unsigned int *reg) 86 { 87 psp->sev_int_rcvd = 0; 88 89 wait_event(psp->sev_int_queue, psp->sev_int_rcvd); 90 *reg = ioread32(psp->io_regs + PSP_CMDRESP); 91 } 92 93 static int sev_cmd_buffer_len(int cmd) 94 { 95 switch (cmd) { 96 case SEV_CMD_INIT: return sizeof(struct sev_data_init); 97 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status); 98 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr); 99 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import); 100 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export); 101 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start); 102 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data); 103 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa); 104 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish); 105 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure); 106 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate); 107 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate); 108 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission); 109 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status); 110 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg); 111 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg); 112 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start); 113 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data); 114 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa); 115 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish); 116 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start); 117 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish); 118 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data); 119 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa); 120 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret); 121 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware); 122 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id); 123 default: return 0; 124 } 125 126 return 0; 127 } 128 129 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) 130 { 131 struct psp_device *psp = psp_master; 132 unsigned int phys_lsb, phys_msb; 133 unsigned int reg, ret = 0; 134 135 if (!psp) 136 return -ENODEV; 137 138 /* Get the physical address of the command buffer */ 139 phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; 140 phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; 141 142 dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x\n", 143 cmd, phys_msb, phys_lsb); 144 145 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, 146 sev_cmd_buffer_len(cmd), false); 147 148 iowrite32(phys_lsb, psp->io_regs + PSP_CMDBUFF_ADDR_LO); 149 iowrite32(phys_msb, psp->io_regs + PSP_CMDBUFF_ADDR_HI); 150 151 reg = cmd; 152 reg <<= PSP_CMDRESP_CMD_SHIFT; 153 reg |= PSP_CMDRESP_IOC; 154 iowrite32(reg, psp->io_regs + PSP_CMDRESP); 155 156 /* wait for command completion */ 157 sev_wait_cmd_ioc(psp, ®); 158 159 if (psp_ret) 160 *psp_ret = reg & PSP_CMDRESP_ERR_MASK; 161 162 if (reg & PSP_CMDRESP_ERR_MASK) { 163 dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n", 164 cmd, reg & PSP_CMDRESP_ERR_MASK); 165 ret = -EIO; 166 } 167 168 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, 169 sev_cmd_buffer_len(cmd), false); 170 171 return ret; 172 } 173 174 static int sev_do_cmd(int cmd, void *data, int *psp_ret) 175 { 176 int rc; 177 178 mutex_lock(&sev_cmd_mutex); 179 rc = __sev_do_cmd_locked(cmd, data, psp_ret); 180 mutex_unlock(&sev_cmd_mutex); 181 182 return rc; 183 } 184 185 static int __sev_platform_init_locked(int *error) 186 { 187 struct psp_device *psp = psp_master; 188 int rc = 0; 189 190 if (!psp) 191 return -ENODEV; 192 193 if (psp->sev_state == SEV_STATE_INIT) 194 return 0; 195 196 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error); 197 if (rc) 198 return rc; 199 200 psp->sev_state = SEV_STATE_INIT; 201 dev_dbg(psp->dev, "SEV firmware initialized\n"); 202 203 return rc; 204 } 205 206 int sev_platform_init(int *error) 207 { 208 int rc; 209 210 mutex_lock(&sev_cmd_mutex); 211 rc = __sev_platform_init_locked(error); 212 mutex_unlock(&sev_cmd_mutex); 213 214 return rc; 215 } 216 EXPORT_SYMBOL_GPL(sev_platform_init); 217 218 static int __sev_platform_shutdown_locked(int *error) 219 { 220 int ret; 221 222 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); 223 if (ret) 224 return ret; 225 226 psp_master->sev_state = SEV_STATE_UNINIT; 227 dev_dbg(psp_master->dev, "SEV firmware shutdown\n"); 228 229 return ret; 230 } 231 232 static int sev_platform_shutdown(int *error) 233 { 234 int rc; 235 236 mutex_lock(&sev_cmd_mutex); 237 rc = __sev_platform_shutdown_locked(NULL); 238 mutex_unlock(&sev_cmd_mutex); 239 240 return rc; 241 } 242 243 static int sev_get_platform_state(int *state, int *error) 244 { 245 int rc; 246 247 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, 248 &psp_master->status_cmd_buf, error); 249 if (rc) 250 return rc; 251 252 *state = psp_master->status_cmd_buf.state; 253 return rc; 254 } 255 256 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) 257 { 258 int state, rc; 259 260 /* 261 * The SEV spec requires that FACTORY_RESET must be issued in 262 * UNINIT state. Before we go further lets check if any guest is 263 * active. 264 * 265 * If FW is in WORKING state then deny the request otherwise issue 266 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. 267 * 268 */ 269 rc = sev_get_platform_state(&state, &argp->error); 270 if (rc) 271 return rc; 272 273 if (state == SEV_STATE_WORKING) 274 return -EBUSY; 275 276 if (state == SEV_STATE_INIT) { 277 rc = __sev_platform_shutdown_locked(&argp->error); 278 if (rc) 279 return rc; 280 } 281 282 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); 283 } 284 285 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) 286 { 287 struct sev_user_data_status *data = &psp_master->status_cmd_buf; 288 int ret; 289 290 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); 291 if (ret) 292 return ret; 293 294 if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) 295 ret = -EFAULT; 296 297 return ret; 298 } 299 300 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) 301 { 302 int rc; 303 304 if (psp_master->sev_state == SEV_STATE_UNINIT) { 305 rc = __sev_platform_init_locked(&argp->error); 306 if (rc) 307 return rc; 308 } 309 310 return __sev_do_cmd_locked(cmd, NULL, &argp->error); 311 } 312 313 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) 314 { 315 struct sev_user_data_pek_csr input; 316 struct sev_data_pek_csr *data; 317 void *blob = NULL; 318 int ret; 319 320 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 321 return -EFAULT; 322 323 data = kzalloc(sizeof(*data), GFP_KERNEL); 324 if (!data) 325 return -ENOMEM; 326 327 /* userspace wants to query CSR length */ 328 if (!input.address || !input.length) 329 goto cmd; 330 331 /* allocate a physically contiguous buffer to store the CSR blob */ 332 if (!access_ok(VERIFY_WRITE, input.address, input.length) || 333 input.length > SEV_FW_BLOB_MAX_SIZE) { 334 ret = -EFAULT; 335 goto e_free; 336 } 337 338 blob = kmalloc(input.length, GFP_KERNEL); 339 if (!blob) { 340 ret = -ENOMEM; 341 goto e_free; 342 } 343 344 data->address = __psp_pa(blob); 345 data->len = input.length; 346 347 cmd: 348 if (psp_master->sev_state == SEV_STATE_UNINIT) { 349 ret = __sev_platform_init_locked(&argp->error); 350 if (ret) 351 goto e_free_blob; 352 } 353 354 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error); 355 356 /* If we query the CSR length, FW responded with expected data. */ 357 input.length = data->len; 358 359 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 360 ret = -EFAULT; 361 goto e_free_blob; 362 } 363 364 if (blob) { 365 if (copy_to_user((void __user *)input.address, blob, input.length)) 366 ret = -EFAULT; 367 } 368 369 e_free_blob: 370 kfree(blob); 371 e_free: 372 kfree(data); 373 return ret; 374 } 375 376 void *psp_copy_user_blob(u64 __user uaddr, u32 len) 377 { 378 if (!uaddr || !len) 379 return ERR_PTR(-EINVAL); 380 381 /* verify that blob length does not exceed our limit */ 382 if (len > SEV_FW_BLOB_MAX_SIZE) 383 return ERR_PTR(-EINVAL); 384 385 return memdup_user((void __user *)(uintptr_t)uaddr, len); 386 } 387 EXPORT_SYMBOL_GPL(psp_copy_user_blob); 388 389 static int sev_get_api_version(void) 390 { 391 struct sev_user_data_status *status; 392 int error, ret; 393 394 status = &psp_master->status_cmd_buf; 395 ret = sev_platform_status(status, &error); 396 if (ret) { 397 dev_err(psp_master->dev, 398 "SEV: failed to get status. Error: %#x\n", error); 399 return 1; 400 } 401 402 psp_master->api_major = status->api_major; 403 psp_master->api_minor = status->api_minor; 404 psp_master->build = status->build; 405 406 return 0; 407 } 408 409 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ 410 static int sev_update_firmware(struct device *dev) 411 { 412 struct sev_data_download_firmware *data; 413 const struct firmware *firmware; 414 int ret, error, order; 415 struct page *p; 416 u64 data_size; 417 418 ret = request_firmware(&firmware, SEV_FW_FILE, dev); 419 if (ret < 0) 420 return -1; 421 422 /* 423 * SEV FW expects the physical address given to it to be 32 424 * byte aligned. Memory allocated has structure placed at the 425 * beginning followed by the firmware being passed to the SEV 426 * FW. Allocate enough memory for data structure + alignment 427 * padding + SEV FW. 428 */ 429 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); 430 431 order = get_order(firmware->size + data_size); 432 p = alloc_pages(GFP_KERNEL, order); 433 if (!p) { 434 ret = -1; 435 goto fw_err; 436 } 437 438 /* 439 * Copy firmware data to a kernel allocated contiguous 440 * memory region. 441 */ 442 data = page_address(p); 443 memcpy(page_address(p) + data_size, firmware->data, firmware->size); 444 445 data->address = __psp_pa(page_address(p) + data_size); 446 data->len = firmware->size; 447 448 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); 449 if (ret) 450 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); 451 else 452 dev_info(dev, "SEV firmware update successful\n"); 453 454 __free_pages(p, order); 455 456 fw_err: 457 release_firmware(firmware); 458 459 return ret; 460 } 461 462 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) 463 { 464 struct sev_user_data_pek_cert_import input; 465 struct sev_data_pek_cert_import *data; 466 void *pek_blob, *oca_blob; 467 int ret; 468 469 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 470 return -EFAULT; 471 472 data = kzalloc(sizeof(*data), GFP_KERNEL); 473 if (!data) 474 return -ENOMEM; 475 476 /* copy PEK certificate blobs from userspace */ 477 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); 478 if (IS_ERR(pek_blob)) { 479 ret = PTR_ERR(pek_blob); 480 goto e_free; 481 } 482 483 data->pek_cert_address = __psp_pa(pek_blob); 484 data->pek_cert_len = input.pek_cert_len; 485 486 /* copy PEK certificate blobs from userspace */ 487 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); 488 if (IS_ERR(oca_blob)) { 489 ret = PTR_ERR(oca_blob); 490 goto e_free_pek; 491 } 492 493 data->oca_cert_address = __psp_pa(oca_blob); 494 data->oca_cert_len = input.oca_cert_len; 495 496 /* If platform is not in INIT state then transition it to INIT */ 497 if (psp_master->sev_state != SEV_STATE_INIT) { 498 ret = __sev_platform_init_locked(&argp->error); 499 if (ret) 500 goto e_free_oca; 501 } 502 503 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error); 504 505 e_free_oca: 506 kfree(oca_blob); 507 e_free_pek: 508 kfree(pek_blob); 509 e_free: 510 kfree(data); 511 return ret; 512 } 513 514 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) 515 { 516 struct sev_data_get_id *data; 517 u64 data_size, user_size; 518 void *id_blob, *mem; 519 int ret; 520 521 /* SEV GET_ID available from SEV API v0.16 and up */ 522 if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16)) 523 return -ENOTSUPP; 524 525 /* SEV FW expects the buffer it fills with the ID to be 526 * 8-byte aligned. Memory allocated should be enough to 527 * hold data structure + alignment padding + memory 528 * where SEV FW writes the ID. 529 */ 530 data_size = ALIGN(sizeof(struct sev_data_get_id), 8); 531 user_size = sizeof(struct sev_user_data_get_id); 532 533 mem = kzalloc(data_size + user_size, GFP_KERNEL); 534 if (!mem) 535 return -ENOMEM; 536 537 data = mem; 538 id_blob = mem + data_size; 539 540 data->address = __psp_pa(id_blob); 541 data->len = user_size; 542 543 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 544 if (!ret) { 545 if (copy_to_user((void __user *)argp->data, id_blob, data->len)) 546 ret = -EFAULT; 547 } 548 549 kfree(mem); 550 551 return ret; 552 } 553 554 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) 555 { 556 struct sev_user_data_pdh_cert_export input; 557 void *pdh_blob = NULL, *cert_blob = NULL; 558 struct sev_data_pdh_cert_export *data; 559 int ret; 560 561 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 562 return -EFAULT; 563 564 data = kzalloc(sizeof(*data), GFP_KERNEL); 565 if (!data) 566 return -ENOMEM; 567 568 /* Userspace wants to query the certificate length. */ 569 if (!input.pdh_cert_address || 570 !input.pdh_cert_len || 571 !input.cert_chain_address) 572 goto cmd; 573 574 /* Allocate a physically contiguous buffer to store the PDH blob. */ 575 if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) || 576 !access_ok(VERIFY_WRITE, input.pdh_cert_address, input.pdh_cert_len)) { 577 ret = -EFAULT; 578 goto e_free; 579 } 580 581 /* Allocate a physically contiguous buffer to store the cert chain blob. */ 582 if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) || 583 !access_ok(VERIFY_WRITE, input.cert_chain_address, input.cert_chain_len)) { 584 ret = -EFAULT; 585 goto e_free; 586 } 587 588 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); 589 if (!pdh_blob) { 590 ret = -ENOMEM; 591 goto e_free; 592 } 593 594 data->pdh_cert_address = __psp_pa(pdh_blob); 595 data->pdh_cert_len = input.pdh_cert_len; 596 597 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); 598 if (!cert_blob) { 599 ret = -ENOMEM; 600 goto e_free_pdh; 601 } 602 603 data->cert_chain_address = __psp_pa(cert_blob); 604 data->cert_chain_len = input.cert_chain_len; 605 606 cmd: 607 /* If platform is not in INIT state then transition it to INIT. */ 608 if (psp_master->sev_state != SEV_STATE_INIT) { 609 ret = __sev_platform_init_locked(&argp->error); 610 if (ret) 611 goto e_free_cert; 612 } 613 614 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error); 615 616 /* If we query the length, FW responded with expected data. */ 617 input.cert_chain_len = data->cert_chain_len; 618 input.pdh_cert_len = data->pdh_cert_len; 619 620 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 621 ret = -EFAULT; 622 goto e_free_cert; 623 } 624 625 if (pdh_blob) { 626 if (copy_to_user((void __user *)input.pdh_cert_address, 627 pdh_blob, input.pdh_cert_len)) { 628 ret = -EFAULT; 629 goto e_free_cert; 630 } 631 } 632 633 if (cert_blob) { 634 if (copy_to_user((void __user *)input.cert_chain_address, 635 cert_blob, input.cert_chain_len)) 636 ret = -EFAULT; 637 } 638 639 e_free_cert: 640 kfree(cert_blob); 641 e_free_pdh: 642 kfree(pdh_blob); 643 e_free: 644 kfree(data); 645 return ret; 646 } 647 648 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 649 { 650 void __user *argp = (void __user *)arg; 651 struct sev_issue_cmd input; 652 int ret = -EFAULT; 653 654 if (!psp_master) 655 return -ENODEV; 656 657 if (ioctl != SEV_ISSUE_CMD) 658 return -EINVAL; 659 660 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) 661 return -EFAULT; 662 663 if (input.cmd > SEV_MAX) 664 return -EINVAL; 665 666 mutex_lock(&sev_cmd_mutex); 667 668 switch (input.cmd) { 669 670 case SEV_FACTORY_RESET: 671 ret = sev_ioctl_do_reset(&input); 672 break; 673 case SEV_PLATFORM_STATUS: 674 ret = sev_ioctl_do_platform_status(&input); 675 break; 676 case SEV_PEK_GEN: 677 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input); 678 break; 679 case SEV_PDH_GEN: 680 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input); 681 break; 682 case SEV_PEK_CSR: 683 ret = sev_ioctl_do_pek_csr(&input); 684 break; 685 case SEV_PEK_CERT_IMPORT: 686 ret = sev_ioctl_do_pek_import(&input); 687 break; 688 case SEV_PDH_CERT_EXPORT: 689 ret = sev_ioctl_do_pdh_export(&input); 690 break; 691 case SEV_GET_ID: 692 ret = sev_ioctl_do_get_id(&input); 693 break; 694 default: 695 ret = -EINVAL; 696 goto out; 697 } 698 699 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) 700 ret = -EFAULT; 701 out: 702 mutex_unlock(&sev_cmd_mutex); 703 704 return ret; 705 } 706 707 static const struct file_operations sev_fops = { 708 .owner = THIS_MODULE, 709 .unlocked_ioctl = sev_ioctl, 710 }; 711 712 int sev_platform_status(struct sev_user_data_status *data, int *error) 713 { 714 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); 715 } 716 EXPORT_SYMBOL_GPL(sev_platform_status); 717 718 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) 719 { 720 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); 721 } 722 EXPORT_SYMBOL_GPL(sev_guest_deactivate); 723 724 int sev_guest_activate(struct sev_data_activate *data, int *error) 725 { 726 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); 727 } 728 EXPORT_SYMBOL_GPL(sev_guest_activate); 729 730 int sev_guest_decommission(struct sev_data_decommission *data, int *error) 731 { 732 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); 733 } 734 EXPORT_SYMBOL_GPL(sev_guest_decommission); 735 736 int sev_guest_df_flush(int *error) 737 { 738 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); 739 } 740 EXPORT_SYMBOL_GPL(sev_guest_df_flush); 741 742 static void sev_exit(struct kref *ref) 743 { 744 struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount); 745 746 misc_deregister(&misc_dev->misc); 747 } 748 749 static int sev_misc_init(struct psp_device *psp) 750 { 751 struct device *dev = psp->dev; 752 int ret; 753 754 /* 755 * SEV feature support can be detected on multiple devices but the SEV 756 * FW commands must be issued on the master. During probe, we do not 757 * know the master hence we create /dev/sev on the first device probe. 758 * sev_do_cmd() finds the right master device to which to issue the 759 * command to the firmware. 760 */ 761 if (!misc_dev) { 762 struct miscdevice *misc; 763 764 misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL); 765 if (!misc_dev) 766 return -ENOMEM; 767 768 misc = &misc_dev->misc; 769 misc->minor = MISC_DYNAMIC_MINOR; 770 misc->name = DEVICE_NAME; 771 misc->fops = &sev_fops; 772 773 ret = misc_register(misc); 774 if (ret) 775 return ret; 776 777 kref_init(&misc_dev->refcount); 778 } else { 779 kref_get(&misc_dev->refcount); 780 } 781 782 init_waitqueue_head(&psp->sev_int_queue); 783 psp->sev_misc = misc_dev; 784 dev_dbg(dev, "registered SEV device\n"); 785 786 return 0; 787 } 788 789 static int sev_init(struct psp_device *psp) 790 { 791 /* Check if device supports SEV feature */ 792 if (!(ioread32(psp->io_regs + PSP_FEATURE_REG) & 1)) { 793 dev_dbg(psp->dev, "device does not support SEV\n"); 794 return 1; 795 } 796 797 return sev_misc_init(psp); 798 } 799 800 int psp_dev_init(struct sp_device *sp) 801 { 802 struct device *dev = sp->dev; 803 struct psp_device *psp; 804 int ret; 805 806 ret = -ENOMEM; 807 psp = psp_alloc_struct(sp); 808 if (!psp) 809 goto e_err; 810 811 sp->psp_data = psp; 812 813 psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata; 814 if (!psp->vdata) { 815 ret = -ENODEV; 816 dev_err(dev, "missing driver data\n"); 817 goto e_err; 818 } 819 820 psp->io_regs = sp->io_map + psp->vdata->offset; 821 822 /* Disable and clear interrupts until ready */ 823 iowrite32(0, psp->io_regs + PSP_P2CMSG_INTEN); 824 iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTSTS); 825 826 /* Request an irq */ 827 ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp); 828 if (ret) { 829 dev_err(dev, "psp: unable to allocate an IRQ\n"); 830 goto e_err; 831 } 832 833 ret = sev_init(psp); 834 if (ret) 835 goto e_irq; 836 837 if (sp->set_psp_master_device) 838 sp->set_psp_master_device(sp); 839 840 /* Enable interrupt */ 841 iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTEN); 842 843 return 0; 844 845 e_irq: 846 sp_free_psp_irq(psp->sp, psp); 847 e_err: 848 sp->psp_data = NULL; 849 850 dev_notice(dev, "psp initialization failed\n"); 851 852 return ret; 853 } 854 855 void psp_dev_destroy(struct sp_device *sp) 856 { 857 struct psp_device *psp = sp->psp_data; 858 859 if (psp->sev_misc) 860 kref_put(&misc_dev->refcount, sev_exit); 861 862 sp_free_psp_irq(sp, psp); 863 } 864 865 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, 866 void *data, int *error) 867 { 868 if (!filep || filep->f_op != &sev_fops) 869 return -EBADF; 870 871 return sev_do_cmd(cmd, data, error); 872 } 873 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); 874 875 void psp_pci_init(void) 876 { 877 struct sp_device *sp; 878 int error, rc; 879 880 sp = sp_get_psp_master_device(); 881 if (!sp) 882 return; 883 884 psp_master = sp->psp_data; 885 886 if (sev_get_api_version()) 887 goto err; 888 889 if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) && 890 sev_update_firmware(psp_master->dev) == 0) 891 sev_get_api_version(); 892 893 /* Initialize the platform */ 894 rc = sev_platform_init(&error); 895 if (rc) { 896 dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); 897 goto err; 898 } 899 900 dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, 901 psp_master->api_minor, psp_master->build); 902 903 return; 904 905 err: 906 psp_master = NULL; 907 } 908 909 void psp_pci_exit(void) 910 { 911 if (!psp_master) 912 return; 913 914 sev_platform_shutdown(NULL); 915 } 916