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