drivers/char/tpm/tpm_ibmvtpm.c

   1 /*
   2  * Copyright (C) 2012 IBM Corporation
   3  *
   4  * Author: Ashley Lai <adlai@us.ibm.com>
   5  *
   6  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
   7  *
   8  * Device driver for TCG/TCPA TPM (trusted platform module).
   9  * Specifications at www.trustedcomputinggroup.org
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation, version 2 of the
  14  * License.
  15  *
  16  */
  17
  18 #include <linux/dma-mapping.h>
  19 #include <linux/dmapool.h>
  20 #include <linux/slab.h>
  21 #include <asm/vio.h>
  22 #include <asm/irq.h>
  23 #include <linux/types.h>
  24 #include <linux/list.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/wait.h>
  28 #include <asm/prom.h>
  29
  30 #include "tpm.h"
  31 #include "tpm_ibmvtpm.h"
  32
  33 static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
  34
  35 static struct vio_device_id tpm_ibmvtpm_device_table[] = {
  36         { "IBM,vtpm", "IBM,vtpm"},
  37         { "", "" }
  38 };
  39 MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
  40
  41 /**
  42  * ibmvtpm_send_crq - Send a CRQ request
  43  * @vdev:       vio device struct
  44  * @w1:         first word
  45  * @w2:         second word
  46  *
  47  * Return value:
  48  *      0 -Sucess
  49  *      Non-zero - Failure
  50  */
  51 static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
  52 {
  53         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
  54 }
  55
  56 /**
  57  * ibmvtpm_get_data - Retrieve ibm vtpm data
  58  * @dev:        device struct
  59  *
  60  * Return value:
  61  *      vtpm device struct
  62  */
  63 static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
  64 {
  65         struct tpm_chip *chip = dev_get_drvdata(dev);
  66         if (chip)
  67                 return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
  68         return NULL;
  69 }
  70
  71 /**
  72  * tpm_ibmvtpm_recv - Receive data after send
  73  * @chip:       tpm chip struct
  74  * @buf:        buffer to read
  75  * count:       size of buffer
  76  *
  77  * Return value:
  78  *      Number of bytes read
  79  */
  80 static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
  81 {
  82         struct ibmvtpm_dev *ibmvtpm;
  83         u16 len;
  84         int sig;
  85
  86         ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
  87
  88         if (!ibmvtpm->rtce_buf) {
  89                 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
  90                 return 0;
  91         }
  92
  93         sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
  94         if (sig)
  95                 return -EINTR;
  96
  97         len = ibmvtpm->res_len;
  98
  99         if (count < len) {
 100                 dev_err(ibmvtpm->dev,
 101                         "Invalid size in recv: count=%ld, crq_size=%d\n",
 102                         count, len);
 103                 return -EIO;
 104         }
 105
 106         spin_lock(&ibmvtpm->rtce_lock);
 107         memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
 108         memset(ibmvtpm->rtce_buf, 0, len);
 109         ibmvtpm->res_len = 0;
 110         spin_unlock(&ibmvtpm->rtce_lock);
 111         return len;
 112 }
 113
 114 /**
 115  * tpm_ibmvtpm_send - Send tpm request
 116  * @chip:       tpm chip struct
 117  * @buf:        buffer contains data to send
 118  * count:       size of buffer
 119  *
 120  * Return value:
 121  *      Number of bytes sent
 122  */
 123 static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 124 {
 125         struct ibmvtpm_dev *ibmvtpm;
 126         struct ibmvtpm_crq crq;
 127         u64 *word = (u64 *) &crq;
 128         int rc;
 129
 130         ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
 131
 132         if (!ibmvtpm->rtce_buf) {
 133                 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
 134                 return 0;
 135         }
 136
 137         if (count > ibmvtpm->rtce_size) {
 138                 dev_err(ibmvtpm->dev,
 139                         "Invalid size in send: count=%ld, rtce_size=%d\n",
 140                         count, ibmvtpm->rtce_size);
 141                 return -EIO;
 142         }
 143
 144         spin_lock(&ibmvtpm->rtce_lock);
 145         memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
 146         crq.valid = (u8)IBMVTPM_VALID_CMD;
 147         crq.msg = (u8)VTPM_TPM_COMMAND;
 148         crq.len = (u16)count;
 149         crq.data = ibmvtpm->rtce_dma_handle;
 150
 151         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(word[0]),
 152                               cpu_to_be64(word[1]));
 153         if (rc != H_SUCCESS) {
 154                 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
 155                 rc = 0;
 156         } else
 157                 rc = count;
 158
 159         spin_unlock(&ibmvtpm->rtce_lock);
 160         return rc;
 161 }
 162
 163 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
 164 {
 165         return;
 166 }
 167
 168 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
 169 {
 170         return 0;
 171 }
 172
 173 /**
 174  * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
 175  * @ibmvtpm:    vtpm device struct
 176  *
 177  * Return value:
 178  *      0 - Success
 179  *      Non-zero - Failure
 180  */
 181 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
 182 {
 183         struct ibmvtpm_crq crq;
 184         u64 *buf = (u64 *) &crq;
 185         int rc;
 186
 187         crq.valid = (u8)IBMVTPM_VALID_CMD;
 188         crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
 189
 190         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 191                               cpu_to_be64(buf[1]));
 192         if (rc != H_SUCCESS)
 193                 dev_err(ibmvtpm->dev,
 194                         "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
 195
 196         return rc;
 197 }
 198
 199 /**
 200  * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
 201  *                         - Note that this is vtpm version and not tpm version
 202  * @ibmvtpm:    vtpm device struct
 203  *
 204  * Return value:
 205  *      0 - Success
 206  *      Non-zero - Failure
 207  */
 208 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
 209 {
 210         struct ibmvtpm_crq crq;
 211         u64 *buf = (u64 *) &crq;
 212         int rc;
 213
 214         crq.valid = (u8)IBMVTPM_VALID_CMD;
 215         crq.msg = (u8)VTPM_GET_VERSION;
 216
 217         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 218                               cpu_to_be64(buf[1]));
 219         if (rc != H_SUCCESS)
 220                 dev_err(ibmvtpm->dev,
 221                         "ibmvtpm_crq_get_version failed rc=%d\n", rc);
 222
 223         return rc;
 224 }
 225
 226 /**
 227  * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
 228  * @ibmvtpm:    vtpm device struct
 229  *
 230  * Return value:
 231  *      0 - Success
 232  *      Non-zero - Failure
 233  */
 234 static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
 235 {
 236         int rc;
 237
 238         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
 239         if (rc != H_SUCCESS)
 240                 dev_err(ibmvtpm->dev,
 241                         "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
 242
 243         return rc;
 244 }
 245
 246 /**
 247  * ibmvtpm_crq_send_init - Send a CRQ initialize message
 248  * @ibmvtpm:    vtpm device struct
 249  *
 250  * Return value:
 251  *      0 - Success
 252  *      Non-zero - Failure
 253  */
 254 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
 255 {
 256         int rc;
 257
 258         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
 259         if (rc != H_SUCCESS)
 260                 dev_err(ibmvtpm->dev,
 261                         "ibmvtpm_crq_send_init failed rc=%d\n", rc);
 262
 263         return rc;
 264 }
 265
 266 /**
 267  * tpm_ibmvtpm_remove - ibm vtpm remove entry point
 268  * @vdev:       vio device struct
 269  *
 270  * Return value:
 271  *      0
 272  */
 273 static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 274 {
 275         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 276         int rc = 0;
 277
 278         free_irq(vdev->irq, ibmvtpm);
 279
 280         do {
 281                 if (rc)
 282                         msleep(100);
 283                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 284         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 285
 286         dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
 287                          CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
 288         free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
 289
 290         if (ibmvtpm->rtce_buf) {
 291                 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
 292                                  ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
 293                 kfree(ibmvtpm->rtce_buf);
 294         }
 295
 296         tpm_remove_hardware(ibmvtpm->dev);
 297
 298         kfree(ibmvtpm);
 299
 300         return 0;
 301 }
 302
 303 /**
 304  * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
 305  * @vdev:       vio device struct
 306  *
 307  * Return value:
 308  *      Number of bytes the driver needs to DMA map
 309  */
 310 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 311 {
 312         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 313
 314         /* ibmvtpm initializes at probe time, so the data we are
 315         * asking for may not be set yet. Estimate that 4K required
 316         * for TCE-mapped buffer in addition to CRQ.
 317         */
 318         if (!ibmvtpm)
 319                 return CRQ_RES_BUF_SIZE + PAGE_SIZE;
 320
 321         return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 322 }
 323
 324 /**
 325  * tpm_ibmvtpm_suspend - Suspend
 326  * @dev:        device struct
 327  *
 328  * Return value:
 329  *      0
 330  */
 331 static int tpm_ibmvtpm_suspend(struct device *dev)
 332 {
 333         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 334         struct ibmvtpm_crq crq;
 335         u64 *buf = (u64 *) &crq;
 336         int rc = 0;
 337
 338         crq.valid = (u8)IBMVTPM_VALID_CMD;
 339         crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
 340
 341         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 342                               cpu_to_be64(buf[1]));
 343         if (rc != H_SUCCESS)
 344                 dev_err(ibmvtpm->dev,
 345                         "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
 346
 347         return rc;
 348 }
 349
 350 /**
 351  * ibmvtpm_reset_crq - Reset CRQ
 352  * @ibmvtpm:    ibm vtpm struct
 353  *
 354  * Return value:
 355  *      0 - Success
 356  *      Non-zero - Failure
 357  */
 358 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
 359 {
 360         int rc = 0;
 361
 362         do {
 363                 if (rc)
 364                         msleep(100);
 365                 rc = plpar_hcall_norets(H_FREE_CRQ,
 366                                         ibmvtpm->vdev->unit_address);
 367         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 368
 369         memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
 370         ibmvtpm->crq_queue.index = 0;
 371
 372         return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
 373                                   ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 374 }
 375
 376 /**
 377  * tpm_ibmvtpm_resume - Resume from suspend
 378  * @dev:        device struct
 379  *
 380  * Return value:
 381  *      0
 382  */
 383 static int tpm_ibmvtpm_resume(struct device *dev)
 384 {
 385         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 386         int rc = 0;
 387
 388         do {
 389                 if (rc)
 390                         msleep(100);
 391                 rc = plpar_hcall_norets(H_ENABLE_CRQ,
 392                                         ibmvtpm->vdev->unit_address);
 393         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 394
 395         if (rc) {
 396                 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
 397                 return rc;
 398         }
 399
 400         rc = vio_enable_interrupts(ibmvtpm->vdev);
 401         if (rc) {
 402                 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
 403                 return rc;
 404         }
 405
 406         rc = ibmvtpm_crq_send_init(ibmvtpm);
 407         if (rc)
 408                 dev_err(dev, "Error send_init rc=%d\n", rc);
 409
 410         return rc;
 411 }
 412
 413 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 414 {
 415         return (status == 0);
 416 }
 417
 418 static const struct file_operations ibmvtpm_ops = {
 419         .owner = THIS_MODULE,
 420         .llseek = no_llseek,
 421         .open = tpm_open,
 422         .read = tpm_read,
 423         .write = tpm_write,
 424         .release = tpm_release,
 425 };
 426
 427 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 428 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 429 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 430 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 431 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 432 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 433                    NULL);
 434 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 435 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 436 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
 437 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 438
 439 static struct attribute *ibmvtpm_attrs[] = {
 440         &dev_attr_pubek.attr,
 441         &dev_attr_pcrs.attr,
 442         &dev_attr_enabled.attr,
 443         &dev_attr_active.attr,
 444         &dev_attr_owned.attr,
 445         &dev_attr_temp_deactivated.attr,
 446         &dev_attr_caps.attr,
 447         &dev_attr_cancel.attr,
 448         &dev_attr_durations.attr,
 449         &dev_attr_timeouts.attr, NULL,
 450 };
 451
 452 static struct attribute_group ibmvtpm_attr_grp = { .attrs = ibmvtpm_attrs };
 453
 454 static const struct tpm_vendor_specific 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 = 0,
 460         .req_complete_val = 0,
 461         .req_canceled = tpm_ibmvtpm_req_canceled,
 462         .attr_group = &ibmvtpm_attr_grp,
 463         .miscdev = { .fops = &ibmvtpm_ops, },
 464 };
 465
 466 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
 467         .suspend = tpm_ibmvtpm_suspend,
 468         .resume = tpm_ibmvtpm_resume,
 469 };
 470
 471 /**
 472  * ibmvtpm_crq_get_next - Get next responded crq
 473  * @ibmvtpm     vtpm device struct
 474  *
 475  * Return value:
 476  *      vtpm crq pointer
 477  */
 478 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
 479 {
 480         struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
 481         struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
 482
 483         if (crq->valid & VTPM_MSG_RES) {
 484                 if (++crq_q->index == crq_q->num_entry)
 485                         crq_q->index = 0;
 486                 smp_rmb();
 487         } else
 488                 crq = NULL;
 489         return crq;
 490 }
 491
 492 /**
 493  * ibmvtpm_crq_process - Process responded crq
 494  * @crq         crq to be processed
 495  * @ibmvtpm     vtpm device struct
 496  *
 497  * Return value:
 498  *      Nothing
 499  */
 500 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 501                                 struct ibmvtpm_dev *ibmvtpm)
 502 {
 503         int rc = 0;
 504
 505         switch (crq->valid) {
 506         case VALID_INIT_CRQ:
 507                 switch (crq->msg) {
 508                 case INIT_CRQ_RES:
 509                         dev_info(ibmvtpm->dev, "CRQ initialized\n");
 510                         rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
 511                         if (rc)
 512                                 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
 513                         return;
 514                 case INIT_CRQ_COMP_RES:
 515                         dev_info(ibmvtpm->dev,
 516                                  "CRQ initialization completed\n");
 517                         return;
 518                 default:
 519                         dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
 520                         return;
 521                 }
 522                 return;
 523         case IBMVTPM_VALID_CMD:
 524                 switch (crq->msg) {
 525                 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
 526                         if (be16_to_cpu(crq->len) <= 0) {
 527                                 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
 528                                 return;
 529                         }
 530                         ibmvtpm->rtce_size = be16_to_cpu(crq->len);
 531                         ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
 532                                                     GFP_KERNEL);
 533                         if (!ibmvtpm->rtce_buf) {
 534                                 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 535                                 return;
 536                         }
 537
 538                         ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
 539                                 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
 540                                 DMA_BIDIRECTIONAL);
 541
 542                         if (dma_mapping_error(ibmvtpm->dev,
 543                                               ibmvtpm->rtce_dma_handle)) {
 544                                 kfree(ibmvtpm->rtce_buf);
 545                                 ibmvtpm->rtce_buf = NULL;
 546                                 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
 547                         }
 548
 549                         return;
 550                 case VTPM_GET_VERSION_RES:
 551                         ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
 552                         return;
 553                 case VTPM_TPM_COMMAND_RES:
 554                         /* len of the data in rtce buffer */
 555                         ibmvtpm->res_len = be16_to_cpu(crq->len);
 556                         wake_up_interruptible(&ibmvtpm->wq);
 557                         return;
 558                 default:
 559                         return;
 560                 }
 561         }
 562         return;
 563 }
 564
 565 /**
 566  * ibmvtpm_interrupt -  Interrupt handler
 567  * @irq:                irq number to handle
 568  * @vtpm_instance:      vtpm that received interrupt
 569  *
 570  * Returns:
 571  *      IRQ_HANDLED
 572  **/
 573 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
 574 {
 575         struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
 576         struct ibmvtpm_crq *crq;
 577
 578         /* while loop is needed for initial setup (get version and
 579          * get rtce_size). There should be only one tpm request at any
 580          * given time.
 581          */
 582         while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
 583                 ibmvtpm_crq_process(crq, ibmvtpm);
 584                 crq->valid = 0;
 585                 smp_wmb();
 586         }
 587
 588         return IRQ_HANDLED;
 589 }
 590
 591 /**
 592  * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 593  * @vio_dev:    vio device struct
 594  * @id:         vio device id struct
 595  *
 596  * Return value:
 597  *      0 - Success
 598  *      Non-zero - Failure
 599  */
 600 static 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 = tpm_register_hardware(dev, &tpm_ibmvtpm);
 610         if (!chip) {
 611                 dev_err(dev, "tpm_register_hardware failed\n");
 612                 return -ENODEV;
 613         }
 614
 615         ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 616         if (!ibmvtpm) {
 617                 dev_err(dev, "kzalloc for ibmvtpm failed\n");
 618                 goto cleanup;
 619         }
 620
 621         crq_q = &ibmvtpm->crq_queue;
 622         crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
 623         if (!crq_q->crq_addr) {
 624                 dev_err(dev, "Unable to allocate memory for crq_addr\n");
 625                 goto cleanup;
 626         }
 627
 628         crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
 629         ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
 630                                                  CRQ_RES_BUF_SIZE,
 631                                                  DMA_BIDIRECTIONAL);
 632
 633         if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
 634                 dev_err(dev, "dma mapping failed\n");
 635                 goto cleanup;
 636         }
 637
 638         rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
 639                                 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 640         if (rc == H_RESOURCE)
 641                 rc = ibmvtpm_reset_crq(ibmvtpm);
 642
 643         if (rc) {
 644                 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
 645                 goto reg_crq_cleanup;
 646         }
 647
 648         rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
 649                          tpm_ibmvtpm_driver_name, ibmvtpm);
 650         if (rc) {
 651                 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
 652                 goto init_irq_cleanup;
 653         }
 654
 655         rc = vio_enable_interrupts(vio_dev);
 656         if (rc) {
 657                 dev_err(dev, "Error %d enabling interrupts\n", rc);
 658                 goto init_irq_cleanup;
 659         }
 660
 661         init_waitqueue_head(&ibmvtpm->wq);
 662
 663         crq_q->index = 0;
 664
 665         ibmvtpm->dev = dev;
 666         ibmvtpm->vdev = vio_dev;
 667         TPM_VPRIV(chip) = (void *)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         return rc;
 684 init_irq_cleanup:
 685         do {
 686                 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
 687         } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
 688 reg_crq_cleanup:
 689         dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
 690                          DMA_BIDIRECTIONAL);
 691 cleanup:
 692         if (ibmvtpm) {
 693                 if (crq_q->crq_addr)
 694                         free_page((unsigned long)crq_q->crq_addr);
 695                 kfree(ibmvtpm);
 696         }
 697
 698         tpm_remove_hardware(dev);
 699
 700         return rc;
 701 }
 702
 703 static struct vio_driver ibmvtpm_driver = {
 704         .id_table        = tpm_ibmvtpm_device_table,
 705         .probe           = tpm_ibmvtpm_probe,
 706         .remove          = tpm_ibmvtpm_remove,
 707         .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
 708         .name            = tpm_ibmvtpm_driver_name,
 709         .pm              = &tpm_ibmvtpm_pm_ops,
 710 };
 711
 712 /**
 713  * ibmvtpm_module_init - Initialize ibm vtpm module
 714  *
 715  * Return value:
 716  *      0 -Success
 717  *      Non-zero - Failure
 718  */
 719 static int __init ibmvtpm_module_init(void)
 720 {
 721         return vio_register_driver(&ibmvtpm_driver);
 722 }
 723
 724 /**
 725  * ibmvtpm_module_exit - Teardown ibm vtpm module
 726  *
 727  * Return value:
 728  *      Nothing
 729  */
 730 static void __exit ibmvtpm_module_exit(void)
 731 {
 732         vio_unregister_driver(&ibmvtpm_driver);
 733 }
 734
 735 module_init(ibmvtpm_module_init);
 736 module_exit(ibmvtpm_module_exit);
 737
 738 MODULE_AUTHOR("adlai@us.ibm.com");
 739 MODULE_DESCRIPTION("IBM vTPM Driver");
 740 MODULE_VERSION("1.0");
 741 MODULE_LICENSE("GPL");