1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2012-2020 IBM Corporation 4 * 5 * Author: Ashley Lai <ashleydlai@gmail.com> 6 * 7 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 8 * 9 * Device driver for TCG/TCPA TPM (trusted platform module). 10 * Specifications at www.trustedcomputinggroup.org 11 */ 12 13#include <linux/dma-mapping.h> 14#include <linux/dmapool.h> 15#include <linux/slab.h> 16#include <asm/vio.h> 17#include <asm/irq.h> 18#include <linux/types.h> 19#include <linux/list.h> 20#include <linux/spinlock.h> 21#include <linux/interrupt.h> 22#include <linux/wait.h> 23#include <asm/prom.h> 24 25#include "tpm.h" 26#include "tpm_ibmvtpm.h" 27 28static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm"; 29 30static const struct vio_device_id tpm_ibmvtpm_device_table[] = { 31 { "IBM,vtpm", "IBM,vtpm"}, 32 { "IBM,vtpm", "IBM,vtpm20"}, 33 { "", "" } 34}; 35MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table); 36 37/** 38 * ibmvtpm_send_crq_word() - Send a CRQ request 39 * @vdev: vio device struct 40 * @w1: pre-constructed first word of tpm crq (second word is reserved) 41 * 42 * Return: 43 * 0 - Success 44 * Non-zero - Failure 45 */ 46static int ibmvtpm_send_crq_word(struct vio_dev *vdev, u64 w1) 47{ 48 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, 0); 49} 50 51/** 52 * ibmvtpm_send_crq() - Send a CRQ request 53 * 54 * @vdev: vio device struct 55 * @valid: Valid field 56 * @msg: Type field 57 * @len: Length field 58 * @data: Data field 59 * 60 * The ibmvtpm crq is defined as follows: 61 * 62 * Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 63 * ----------------------------------------------------------------------- 64 * Word0 | Valid | Type | Length | Data 65 * ----------------------------------------------------------------------- 66 * Word1 | Reserved 67 * ----------------------------------------------------------------------- 68 * 69 * Which matches the following structure (on bigendian host): 70 * 71 * struct ibmvtpm_crq { 72 * u8 valid; 73 * u8 msg; 74 * __be16 len; 75 * __be32 data; 76 * __be64 reserved; 77 * } __attribute__((packed, aligned(8))); 78 * 79 * However, the value is passed in a register so just compute the numeric value 80 * to load into the register avoiding byteswap altogether. Endian only affects 81 * memory loads and stores - registers are internally represented the same. 82 * 83 * Return: 84 * 0 (H_SUCCESS) - Success 85 * Non-zero - Failure 86 */ 87static int ibmvtpm_send_crq(struct vio_dev *vdev, 88 u8 valid, u8 msg, u16 len, u32 data) 89{ 90 u64 w1 = ((u64)valid << 56) | ((u64)msg << 48) | ((u64)len << 32) | 91 (u64)data; 92 return ibmvtpm_send_crq_word(vdev, w1); 93} 94 95/** 96 * tpm_ibmvtpm_recv - Receive data after send 97 * 98 * @chip: tpm chip struct 99 * @buf: buffer to read 100 * @count: size of buffer 101 * 102 * Return: 103 * Number of bytes read 104 */ 105static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) 106{ 107 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 108 u16 len; 109 110 if (!ibmvtpm->rtce_buf) { 111 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 112 return 0; 113 } 114 115 len = ibmvtpm->res_len; 116 117 if (count < len) { 118 dev_err(ibmvtpm->dev, 119 "Invalid size in recv: count=%zd, crq_size=%d\n", 120 count, len); 121 return -EIO; 122 } 123 124 spin_lock(&ibmvtpm->rtce_lock); 125 memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len); 126 memset(ibmvtpm->rtce_buf, 0, len); 127 ibmvtpm->res_len = 0; 128 spin_unlock(&ibmvtpm->rtce_lock); 129 return len; 130} 131 132/** 133 * ibmvtpm_crq_send_init - Send a CRQ initialize message 134 * @ibmvtpm: vtpm device struct 135 * 136 * Return: 137 * 0 on success. 138 * Non-zero on failure. 139 */ 140static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm) 141{ 142 int rc; 143 144 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_CMD); 145 if (rc != H_SUCCESS) 146 dev_err(ibmvtpm->dev, 147 "%s failed rc=%d\n", __func__, rc); 148 149 return rc; 150} 151 152/** 153 * tpm_ibmvtpm_resume - Resume from suspend 154 * 155 * @dev: device struct 156 * 157 * Return: Always 0. 158 */ 159static int tpm_ibmvtpm_resume(struct device *dev) 160{ 161 struct tpm_chip *chip = dev_get_drvdata(dev); 162 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 163 int rc = 0; 164 165 do { 166 if (rc) 167 msleep(100); 168 rc = plpar_hcall_norets(H_ENABLE_CRQ, 169 ibmvtpm->vdev->unit_address); 170 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 171 172 if (rc) { 173 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc); 174 return rc; 175 } 176 177 rc = vio_enable_interrupts(ibmvtpm->vdev); 178 if (rc) { 179 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc); 180 return rc; 181 } 182 183 rc = ibmvtpm_crq_send_init(ibmvtpm); 184 if (rc) 185 dev_err(dev, "Error send_init rc=%d\n", rc); 186 187 return rc; 188} 189 190/** 191 * tpm_ibmvtpm_send() - Send a TPM command 192 * @chip: tpm chip struct 193 * @buf: buffer contains data to send 194 * @count: size of buffer 195 * 196 * Return: 197 * 0 on success, 198 * -errno on error 199 */ 200static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) 201{ 202 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 203 bool retry = true; 204 int rc, sig; 205 206 if (!ibmvtpm->rtce_buf) { 207 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 208 return 0; 209 } 210 211 if (count > ibmvtpm->rtce_size) { 212 dev_err(ibmvtpm->dev, 213 "Invalid size in send: count=%zd, rtce_size=%d\n", 214 count, ibmvtpm->rtce_size); 215 return -EIO; 216 } 217 218 if (ibmvtpm->tpm_processing_cmd) { 219 dev_info(ibmvtpm->dev, 220 "Need to wait for TPM to finish\n"); 221 /* wait for previous command to finish */ 222 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); 223 if (sig) 224 return -EINTR; 225 } 226 227 spin_lock(&ibmvtpm->rtce_lock); 228 ibmvtpm->res_len = 0; 229 memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count); 230 231 /* 232 * set the processing flag before the Hcall, since we may get the 233 * result (interrupt) before even being able to check rc. 234 */ 235 ibmvtpm->tpm_processing_cmd = 1; 236 237again: 238 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 239 IBMVTPM_VALID_CMD, VTPM_TPM_COMMAND, 240 count, ibmvtpm->rtce_dma_handle); 241 if (rc != H_SUCCESS) { 242 /* 243 * H_CLOSED can be returned after LPM resume. Call 244 * tpm_ibmvtpm_resume() to re-enable the CRQ then retry 245 * ibmvtpm_send_crq() once before failing. 246 */ 247 if (rc == H_CLOSED && retry) { 248 tpm_ibmvtpm_resume(ibmvtpm->dev); 249 retry = false; 250 goto again; 251 } 252 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc); 253 ibmvtpm->tpm_processing_cmd = 0; 254 } 255 256 spin_unlock(&ibmvtpm->rtce_lock); 257 return 0; 258} 259 260static void tpm_ibmvtpm_cancel(struct tpm_chip *chip) 261{ 262 return; 263} 264 265static u8 tpm_ibmvtpm_status(struct tpm_chip *chip) 266{ 267 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 268 269 return ibmvtpm->tpm_processing_cmd; 270} 271 272/** 273 * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size 274 * 275 * @ibmvtpm: vtpm device struct 276 * 277 * Return: 278 * 0 on success. 279 * Non-zero on failure. 280 */ 281static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm) 282{ 283 int rc; 284 285 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 286 IBMVTPM_VALID_CMD, VTPM_GET_RTCE_BUFFER_SIZE, 0, 0); 287 if (rc != H_SUCCESS) 288 dev_err(ibmvtpm->dev, 289 "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc); 290 291 return rc; 292} 293 294/** 295 * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version 296 * - Note that this is vtpm version and not tpm version 297 * 298 * @ibmvtpm: vtpm device struct 299 * 300 * Return: 301 * 0 on success. 302 * Non-zero on failure. 303 */ 304static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm) 305{ 306 int rc; 307 308 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 309 IBMVTPM_VALID_CMD, VTPM_GET_VERSION, 0, 0); 310 if (rc != H_SUCCESS) 311 dev_err(ibmvtpm->dev, 312 "ibmvtpm_crq_get_version failed rc=%d\n", rc); 313 314 return rc; 315} 316 317/** 318 * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message 319 * @ibmvtpm: vtpm device struct 320 * 321 * Return: 322 * 0 on success. 323 * Non-zero on failure. 324 */ 325static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm) 326{ 327 int rc; 328 329 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_COMP_CMD); 330 if (rc != H_SUCCESS) 331 dev_err(ibmvtpm->dev, 332 "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc); 333 334 return rc; 335} 336 337/** 338 * tpm_ibmvtpm_remove - ibm vtpm remove entry point 339 * @vdev: vio device struct 340 * 341 * Return: Always 0. 342 */ 343static int tpm_ibmvtpm_remove(struct vio_dev *vdev) 344{ 345 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); 346 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 347 int rc = 0; 348 349 tpm_chip_unregister(chip); 350 351 free_irq(vdev->irq, ibmvtpm); 352 353 do { 354 if (rc) 355 msleep(100); 356 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 357 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 358 359 dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle, 360 CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL); 361 free_page((unsigned long)ibmvtpm->crq_queue.crq_addr); 362 363 if (ibmvtpm->rtce_buf) { 364 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle, 365 ibmvtpm->rtce_size, DMA_BIDIRECTIONAL); 366 kfree(ibmvtpm->rtce_buf); 367 } 368 369 kfree(ibmvtpm); 370 /* For tpm_ibmvtpm_get_desired_dma */ 371 dev_set_drvdata(&vdev->dev, NULL); 372 373 return 0; 374} 375 376/** 377 * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver 378 * @vdev: vio device struct 379 * 380 * Return: 381 * Number of bytes the driver needs to DMA map. 382 */ 383static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev) 384{ 385 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); 386 struct ibmvtpm_dev *ibmvtpm; 387 388 /* 389 * ibmvtpm initializes at probe time, so the data we are 390 * asking for may not be set yet. Estimate that 4K required 391 * for TCE-mapped buffer in addition to CRQ. 392 */ 393 if (chip) 394 ibmvtpm = dev_get_drvdata(&chip->dev); 395 else 396 return CRQ_RES_BUF_SIZE + PAGE_SIZE; 397 398 return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size; 399} 400 401/** 402 * tpm_ibmvtpm_suspend - Suspend 403 * @dev: device struct 404 * 405 * Return: Always 0. 406 */ 407static int tpm_ibmvtpm_suspend(struct device *dev) 408{ 409 struct tpm_chip *chip = dev_get_drvdata(dev); 410 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 411 int rc = 0; 412 413 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 414 IBMVTPM_VALID_CMD, VTPM_PREPARE_TO_SUSPEND, 0, 0); 415 if (rc != H_SUCCESS) 416 dev_err(ibmvtpm->dev, 417 "tpm_ibmvtpm_suspend failed rc=%d\n", rc); 418 419 return rc; 420} 421 422/** 423 * ibmvtpm_reset_crq - Reset CRQ 424 * 425 * @ibmvtpm: ibm vtpm struct 426 * 427 * Return: 428 * 0 on success. 429 * Non-zero on failure. 430 */ 431static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm) 432{ 433 int rc = 0; 434 435 do { 436 if (rc) 437 msleep(100); 438 rc = plpar_hcall_norets(H_FREE_CRQ, 439 ibmvtpm->vdev->unit_address); 440 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 441 442 memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE); 443 ibmvtpm->crq_queue.index = 0; 444 445 return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address, 446 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 447} 448 449static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status) 450{ 451 return (status == 0); 452} 453 454static const struct tpm_class_ops tpm_ibmvtpm = { 455 .recv = tpm_ibmvtpm_recv, 456 .send = tpm_ibmvtpm_send, 457 .cancel = tpm_ibmvtpm_cancel, 458 .status = tpm_ibmvtpm_status, 459 .req_complete_mask = 1, 460 .req_complete_val = 0, 461 .req_canceled = tpm_ibmvtpm_req_canceled, 462}; 463 464static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = { 465 .suspend = tpm_ibmvtpm_suspend, 466 .resume = tpm_ibmvtpm_resume, 467}; 468 469/** 470 * ibmvtpm_crq_get_next - Get next responded crq 471 * 472 * @ibmvtpm: vtpm device struct 473 * 474 * Return: vtpm crq pointer or NULL. 475 */ 476static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm) 477{ 478 struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue; 479 struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index]; 480 481 if (crq->valid & VTPM_MSG_RES) { 482 if (++crq_q->index == crq_q->num_entry) 483 crq_q->index = 0; 484 smp_rmb(); 485 } else 486 crq = NULL; 487 return crq; 488} 489 490/** 491 * ibmvtpm_crq_process - Process responded crq 492 * 493 * @crq: crq to be processed 494 * @ibmvtpm: vtpm device struct 495 * 496 */ 497static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq, 498 struct ibmvtpm_dev *ibmvtpm) 499{ 500 int rc = 0; 501 502 switch (crq->valid) { 503 case VALID_INIT_CRQ: 504 switch (crq->msg) { 505 case INIT_CRQ_RES: 506 dev_info(ibmvtpm->dev, "CRQ initialized\n"); 507 rc = ibmvtpm_crq_send_init_complete(ibmvtpm); 508 if (rc) 509 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc); 510 return; 511 case INIT_CRQ_COMP_RES: 512 dev_info(ibmvtpm->dev, 513 "CRQ initialization completed\n"); 514 return; 515 default: 516 dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg); 517 return; 518 } 519 case IBMVTPM_VALID_CMD: 520 switch (crq->msg) { 521 case VTPM_GET_RTCE_BUFFER_SIZE_RES: 522 if (be16_to_cpu(crq->len) <= 0) { 523 dev_err(ibmvtpm->dev, "Invalid rtce size\n"); 524 return; 525 } 526 ibmvtpm->rtce_size = be16_to_cpu(crq->len); 527 ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size, 528 GFP_ATOMIC); 529 if (!ibmvtpm->rtce_buf) { 530 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n"); 531 return; 532 } 533 534 ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev, 535 ibmvtpm->rtce_buf, ibmvtpm->rtce_size, 536 DMA_BIDIRECTIONAL); 537 538 if (dma_mapping_error(ibmvtpm->dev, 539 ibmvtpm->rtce_dma_handle)) { 540 kfree(ibmvtpm->rtce_buf); 541 ibmvtpm->rtce_buf = NULL; 542 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n"); 543 } 544 545 return; 546 case VTPM_GET_VERSION_RES: 547 ibmvtpm->vtpm_version = be32_to_cpu(crq->data); 548 return; 549 case VTPM_TPM_COMMAND_RES: 550 /* len of the data in rtce buffer */ 551 ibmvtpm->res_len = be16_to_cpu(crq->len); 552 ibmvtpm->tpm_processing_cmd = 0; 553 wake_up_interruptible(&ibmvtpm->wq); 554 return; 555 default: 556 return; 557 } 558 } 559 return; 560} 561 562/** 563 * ibmvtpm_interrupt - Interrupt handler 564 * 565 * @irq: irq number to handle 566 * @vtpm_instance: vtpm that received interrupt 567 * 568 * Returns: 569 * IRQ_HANDLED 570 **/ 571static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance) 572{ 573 struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance; 574 struct ibmvtpm_crq *crq; 575 576 /* while loop is needed for initial setup (get version and 577 * get rtce_size). There should be only one tpm request at any 578 * given time. 579 */ 580 while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) { 581 ibmvtpm_crq_process(crq, ibmvtpm); 582 wake_up_interruptible(&ibmvtpm->crq_queue.wq); 583 crq->valid = 0; 584 smp_wmb(); 585 } 586 587 return IRQ_HANDLED; 588} 589 590/** 591 * tpm_ibmvtpm_probe - ibm vtpm initialize entry point 592 * 593 * @vio_dev: vio device struct 594 * @id: vio device id struct 595 * 596 * Return: 597 * 0 on success. 598 * Non-zero on failure. 599 */ 600static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev, 601 const struct vio_device_id *id) 602{ 603 struct ibmvtpm_dev *ibmvtpm; 604 struct device *dev = &vio_dev->dev; 605 struct ibmvtpm_crq_queue *crq_q; 606 struct tpm_chip *chip; 607 int rc = -ENOMEM, rc1; 608 609 chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm); 610 if (IS_ERR(chip)) 611 return PTR_ERR(chip); 612 613 ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL); 614 if (!ibmvtpm) { 615 dev_err(dev, "kzalloc for ibmvtpm failed\n"); 616 goto cleanup; 617 } 618 619 ibmvtpm->dev = dev; 620 ibmvtpm->vdev = vio_dev; 621 622 crq_q = &ibmvtpm->crq_queue; 623 crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL); 624 if (!crq_q->crq_addr) { 625 dev_err(dev, "Unable to allocate memory for crq_addr\n"); 626 goto cleanup; 627 } 628 629 crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr); 630 init_waitqueue_head(&crq_q->wq); 631 ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr, 632 CRQ_RES_BUF_SIZE, 633 DMA_BIDIRECTIONAL); 634 635 if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) { 636 dev_err(dev, "dma mapping failed\n"); 637 goto cleanup; 638 } 639 640 rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address, 641 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 642 if (rc == H_RESOURCE) 643 rc = ibmvtpm_reset_crq(ibmvtpm); 644 645 if (rc) { 646 dev_err(dev, "Unable to register CRQ rc=%d\n", rc); 647 goto reg_crq_cleanup; 648 } 649 650 rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0, 651 tpm_ibmvtpm_driver_name, ibmvtpm); 652 if (rc) { 653 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq); 654 goto init_irq_cleanup; 655 } 656 657 rc = vio_enable_interrupts(vio_dev); 658 if (rc) { 659 dev_err(dev, "Error %d enabling interrupts\n", rc); 660 goto init_irq_cleanup; 661 } 662 663 init_waitqueue_head(&ibmvtpm->wq); 664 665 crq_q->index = 0; 666 667 dev_set_drvdata(&chip->dev, ibmvtpm); 668 669 spin_lock_init(&ibmvtpm->rtce_lock); 670 671 rc = ibmvtpm_crq_send_init(ibmvtpm); 672 if (rc) 673 goto init_irq_cleanup; 674 675 rc = ibmvtpm_crq_get_version(ibmvtpm); 676 if (rc) 677 goto init_irq_cleanup; 678 679 rc = ibmvtpm_crq_get_rtce_size(ibmvtpm); 680 if (rc) 681 goto init_irq_cleanup; 682 683 if (!wait_event_timeout(ibmvtpm->crq_queue.wq, 684 ibmvtpm->rtce_buf != NULL, 685 HZ)) { 686 rc = -ENODEV; 687 dev_err(dev, "CRQ response timed out\n"); 688 goto init_irq_cleanup; 689 } 690 691 692 if (!strcmp(id->compat, "IBM,vtpm20")) 693 chip->flags |= TPM_CHIP_FLAG_TPM2; 694 695 rc = tpm_get_timeouts(chip); 696 if (rc) 697 goto init_irq_cleanup; 698 699 if (chip->flags & TPM_CHIP_FLAG_TPM2) { 700 rc = tpm2_get_cc_attrs_tbl(chip); 701 if (rc) 702 goto init_irq_cleanup; 703 } 704 705 return tpm_chip_register(chip); 706init_irq_cleanup: 707 do { 708 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address); 709 } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1)); 710reg_crq_cleanup: 711 dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE, 712 DMA_BIDIRECTIONAL); 713cleanup: 714 if (ibmvtpm) { 715 if (crq_q->crq_addr) 716 free_page((unsigned long)crq_q->crq_addr); 717 kfree(ibmvtpm); 718 } 719 720 return rc; 721} 722 723static struct vio_driver ibmvtpm_driver = { 724 .id_table = tpm_ibmvtpm_device_table, 725 .probe = tpm_ibmvtpm_probe, 726 .remove = tpm_ibmvtpm_remove, 727 .get_desired_dma = tpm_ibmvtpm_get_desired_dma, 728 .name = tpm_ibmvtpm_driver_name, 729 .pm = &tpm_ibmvtpm_pm_ops, 730}; 731 732/** 733 * ibmvtpm_module_init - Initialize ibm vtpm module. 734 * 735 * 736 * Return: 737 * 0 on success. 738 * Non-zero on failure. 739 */ 740static int __init ibmvtpm_module_init(void) 741{ 742 return vio_register_driver(&ibmvtpm_driver); 743} 744 745/** 746 * ibmvtpm_module_exit - Tear down ibm vtpm module. 747 */ 748static void __exit ibmvtpm_module_exit(void) 749{ 750 vio_unregister_driver(&ibmvtpm_driver); 751} 752 753module_init(ibmvtpm_module_init); 754module_exit(ibmvtpm_module_exit); 755 756MODULE_AUTHOR("adlai@us.ibm.com"); 757MODULE_DESCRIPTION("IBM vTPM Driver"); 758MODULE_VERSION("1.0"); 759MODULE_LICENSE("GPL"); 760