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![Stefan Berger](/assets/img/avatar_default.png)
When the TPM response reception is interrupted in the wait_event_interruptable call, the TPM is still busy processing the command and will only deliver the response later. So we have to wait for an outstanding response before sending a new request to avoid trying to put a 2nd request into the CRQ. Also reset the res_len before sending a command so we will end up in that wait_event_interruptable() waiting for the response rather than reading the command packet as a response. The easiest way to trigger the problem is to run the following cd /sys/device/vio/71000004 while :; cat pcrs >/dev/null; done And press Ctrl-C. This will then display an error tpm_ibmvtpm 71000004: tpm_transmit: tpm_recv: error -4 followed by several other errors once interaction with the TPM resumes. tpm_ibmvtpm 71000004: A TPM error (101) occurred attempting to determine the number of PCRS. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Tested-by: Hon Ching(Vicky) Lo <honclo@linux.vnet.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Ashley Lai <ashley@ashleylai.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Acked-by: Peter Huewe <peterhuewe@gmx.de>
718 lines
16 KiB
C
718 lines
16 KiB
C
/*
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* Copyright (C) 2012 IBM Corporation
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*
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* Author: Ashley Lai <ashleydlai@gmail.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/slab.h>
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#include <asm/vio.h>
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#include <asm/irq.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/wait.h>
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#include <asm/prom.h>
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#include "tpm.h"
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#include "tpm_ibmvtpm.h"
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static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
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static struct vio_device_id tpm_ibmvtpm_device_table[] = {
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{ "IBM,vtpm", "IBM,vtpm"},
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{ "", "" }
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};
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MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
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/**
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* ibmvtpm_send_crq - Send a CRQ request
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* @vdev: vio device struct
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* @w1: first word
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* @w2: second word
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*
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* Return value:
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* 0 -Sucess
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* Non-zero - Failure
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*/
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static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
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{
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return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
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}
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/**
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* ibmvtpm_get_data - Retrieve ibm vtpm data
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* @dev: device struct
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*
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* Return value:
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* vtpm device struct
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*/
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static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
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{
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struct tpm_chip *chip = dev_get_drvdata(dev);
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if (chip)
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return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
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return NULL;
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}
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/**
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* tpm_ibmvtpm_recv - Receive data after send
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* @chip: tpm chip struct
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* @buf: buffer to read
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* count: size of buffer
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*
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* Return value:
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* Number of bytes read
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*/
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static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct ibmvtpm_dev *ibmvtpm;
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u16 len;
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int sig;
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ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
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if (!ibmvtpm->rtce_buf) {
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dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
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return 0;
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}
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sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
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if (sig)
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return -EINTR;
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len = ibmvtpm->res_len;
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if (count < len) {
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dev_err(ibmvtpm->dev,
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"Invalid size in recv: count=%zd, crq_size=%d\n",
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count, len);
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return -EIO;
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}
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spin_lock(&ibmvtpm->rtce_lock);
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memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
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memset(ibmvtpm->rtce_buf, 0, len);
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ibmvtpm->res_len = 0;
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spin_unlock(&ibmvtpm->rtce_lock);
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return len;
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}
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/**
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* tpm_ibmvtpm_send - Send tpm request
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* @chip: tpm chip struct
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* @buf: buffer contains data to send
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* count: size of buffer
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*
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* Return value:
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* Number of bytes sent
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*/
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static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct ibmvtpm_dev *ibmvtpm;
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struct ibmvtpm_crq crq;
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__be64 *word = (__be64 *)&crq;
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int rc, sig;
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ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
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if (!ibmvtpm->rtce_buf) {
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dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
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return 0;
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}
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if (count > ibmvtpm->rtce_size) {
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dev_err(ibmvtpm->dev,
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"Invalid size in send: count=%zd, rtce_size=%d\n",
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count, ibmvtpm->rtce_size);
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return -EIO;
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}
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if (ibmvtpm->tpm_processing_cmd) {
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dev_info(ibmvtpm->dev,
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"Need to wait for TPM to finish\n");
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/* wait for previous command to finish */
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sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
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if (sig)
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return -EINTR;
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}
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spin_lock(&ibmvtpm->rtce_lock);
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ibmvtpm->res_len = 0;
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memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
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crq.valid = (u8)IBMVTPM_VALID_CMD;
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crq.msg = (u8)VTPM_TPM_COMMAND;
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crq.len = cpu_to_be16(count);
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crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
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/*
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* set the processing flag before the Hcall, since we may get the
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* result (interrupt) before even being able to check rc.
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*/
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ibmvtpm->tpm_processing_cmd = true;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
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be64_to_cpu(word[1]));
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if (rc != H_SUCCESS) {
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dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
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rc = 0;
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ibmvtpm->tpm_processing_cmd = false;
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} else
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rc = count;
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spin_unlock(&ibmvtpm->rtce_lock);
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return rc;
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}
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static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
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{
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return;
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}
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static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
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{
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return 0;
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}
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/**
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* ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
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* @ibmvtpm: vtpm device struct
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*
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* Return value:
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* 0 - Success
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* Non-zero - Failure
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*/
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static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
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{
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struct ibmvtpm_crq crq;
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u64 *buf = (u64 *) &crq;
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int rc;
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crq.valid = (u8)IBMVTPM_VALID_CMD;
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crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
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cpu_to_be64(buf[1]));
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if (rc != H_SUCCESS)
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dev_err(ibmvtpm->dev,
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"ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
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return rc;
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}
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/**
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* ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
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* - Note that this is vtpm version and not tpm version
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* @ibmvtpm: vtpm device struct
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*
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* Return value:
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* 0 - Success
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* Non-zero - Failure
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*/
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static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
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{
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struct ibmvtpm_crq crq;
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u64 *buf = (u64 *) &crq;
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int rc;
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crq.valid = (u8)IBMVTPM_VALID_CMD;
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crq.msg = (u8)VTPM_GET_VERSION;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
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cpu_to_be64(buf[1]));
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if (rc != H_SUCCESS)
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dev_err(ibmvtpm->dev,
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"ibmvtpm_crq_get_version failed rc=%d\n", rc);
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return rc;
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}
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/**
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* ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
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* @ibmvtpm: vtpm device struct
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*
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* Return value:
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* 0 - Success
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* Non-zero - Failure
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*/
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static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
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{
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int rc;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
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if (rc != H_SUCCESS)
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dev_err(ibmvtpm->dev,
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"ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
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return rc;
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}
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/**
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* ibmvtpm_crq_send_init - Send a CRQ initialize message
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* @ibmvtpm: vtpm device struct
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*
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* Return value:
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* 0 - Success
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* Non-zero - Failure
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*/
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static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
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{
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int rc;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
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if (rc != H_SUCCESS)
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dev_err(ibmvtpm->dev,
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"ibmvtpm_crq_send_init failed rc=%d\n", rc);
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return rc;
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}
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/**
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* tpm_ibmvtpm_remove - ibm vtpm remove entry point
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* @vdev: vio device struct
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*
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* Return value:
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* 0
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*/
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static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
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{
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struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
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struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
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int rc = 0;
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tpm_chip_unregister(chip);
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free_irq(vdev->irq, ibmvtpm);
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do {
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if (rc)
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msleep(100);
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rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
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} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
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dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
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CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
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free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
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if (ibmvtpm->rtce_buf) {
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dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
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ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
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kfree(ibmvtpm->rtce_buf);
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}
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kfree(ibmvtpm);
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return 0;
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}
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/**
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* tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
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* @vdev: vio device struct
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*
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* Return value:
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* Number of bytes the driver needs to DMA map
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*/
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static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
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{
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struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
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/* ibmvtpm initializes at probe time, so the data we are
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* asking for may not be set yet. Estimate that 4K required
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* for TCE-mapped buffer in addition to CRQ.
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*/
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if (!ibmvtpm)
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return CRQ_RES_BUF_SIZE + PAGE_SIZE;
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return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
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}
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/**
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* tpm_ibmvtpm_suspend - Suspend
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* @dev: device struct
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*
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* Return value:
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* 0
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*/
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static int tpm_ibmvtpm_suspend(struct device *dev)
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{
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struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
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struct ibmvtpm_crq crq;
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u64 *buf = (u64 *) &crq;
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int rc = 0;
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crq.valid = (u8)IBMVTPM_VALID_CMD;
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crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
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rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
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cpu_to_be64(buf[1]));
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if (rc != H_SUCCESS)
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dev_err(ibmvtpm->dev,
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"tpm_ibmvtpm_suspend failed rc=%d\n", rc);
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return rc;
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}
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/**
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* ibmvtpm_reset_crq - Reset CRQ
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* @ibmvtpm: ibm vtpm struct
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*
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* Return value:
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* 0 - Success
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* Non-zero - Failure
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*/
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static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
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{
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int rc = 0;
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do {
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if (rc)
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msleep(100);
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rc = plpar_hcall_norets(H_FREE_CRQ,
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ibmvtpm->vdev->unit_address);
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} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
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memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
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ibmvtpm->crq_queue.index = 0;
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return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
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ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
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}
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/**
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* tpm_ibmvtpm_resume - Resume from suspend
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* @dev: device struct
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*
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* Return value:
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* 0
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*/
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static int tpm_ibmvtpm_resume(struct device *dev)
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{
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struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
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int rc = 0;
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do {
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if (rc)
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msleep(100);
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rc = plpar_hcall_norets(H_ENABLE_CRQ,
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ibmvtpm->vdev->unit_address);
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} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
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if (rc) {
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dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
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return rc;
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}
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rc = vio_enable_interrupts(ibmvtpm->vdev);
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if (rc) {
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dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
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return rc;
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}
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rc = ibmvtpm_crq_send_init(ibmvtpm);
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if (rc)
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dev_err(dev, "Error send_init rc=%d\n", rc);
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return rc;
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}
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static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
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{
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return (status == 0);
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}
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static const struct tpm_class_ops tpm_ibmvtpm = {
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.recv = tpm_ibmvtpm_recv,
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.send = tpm_ibmvtpm_send,
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.cancel = tpm_ibmvtpm_cancel,
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.status = tpm_ibmvtpm_status,
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.req_complete_mask = 0,
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.req_complete_val = 0,
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.req_canceled = tpm_ibmvtpm_req_canceled,
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};
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static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
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.suspend = tpm_ibmvtpm_suspend,
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.resume = tpm_ibmvtpm_resume,
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};
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/**
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* ibmvtpm_crq_get_next - Get next responded crq
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* @ibmvtpm vtpm device struct
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*
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* Return value:
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* vtpm crq pointer
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*/
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static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
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{
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struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
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struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
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if (crq->valid & VTPM_MSG_RES) {
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if (++crq_q->index == crq_q->num_entry)
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crq_q->index = 0;
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smp_rmb();
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} else
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crq = NULL;
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return crq;
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}
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/**
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* ibmvtpm_crq_process - Process responded crq
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* @crq crq to be processed
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* @ibmvtpm vtpm device struct
|
|
*
|
|
* Return value:
|
|
* Nothing
|
|
*/
|
|
static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
|
|
struct ibmvtpm_dev *ibmvtpm)
|
|
{
|
|
int rc = 0;
|
|
|
|
switch (crq->valid) {
|
|
case VALID_INIT_CRQ:
|
|
switch (crq->msg) {
|
|
case INIT_CRQ_RES:
|
|
dev_info(ibmvtpm->dev, "CRQ initialized\n");
|
|
rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
|
|
if (rc)
|
|
dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
|
|
return;
|
|
case INIT_CRQ_COMP_RES:
|
|
dev_info(ibmvtpm->dev,
|
|
"CRQ initialization completed\n");
|
|
return;
|
|
default:
|
|
dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
|
|
return;
|
|
}
|
|
case IBMVTPM_VALID_CMD:
|
|
switch (crq->msg) {
|
|
case VTPM_GET_RTCE_BUFFER_SIZE_RES:
|
|
if (be16_to_cpu(crq->len) <= 0) {
|
|
dev_err(ibmvtpm->dev, "Invalid rtce size\n");
|
|
return;
|
|
}
|
|
ibmvtpm->rtce_size = be16_to_cpu(crq->len);
|
|
ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
|
|
GFP_ATOMIC);
|
|
if (!ibmvtpm->rtce_buf) {
|
|
dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
|
|
return;
|
|
}
|
|
|
|
ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
|
|
ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
if (dma_mapping_error(ibmvtpm->dev,
|
|
ibmvtpm->rtce_dma_handle)) {
|
|
kfree(ibmvtpm->rtce_buf);
|
|
ibmvtpm->rtce_buf = NULL;
|
|
dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
|
|
}
|
|
|
|
return;
|
|
case VTPM_GET_VERSION_RES:
|
|
ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
|
|
return;
|
|
case VTPM_TPM_COMMAND_RES:
|
|
/* len of the data in rtce buffer */
|
|
ibmvtpm->res_len = be16_to_cpu(crq->len);
|
|
ibmvtpm->tpm_processing_cmd = false;
|
|
wake_up_interruptible(&ibmvtpm->wq);
|
|
return;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* ibmvtpm_interrupt - Interrupt handler
|
|
* @irq: irq number to handle
|
|
* @vtpm_instance: vtpm that received interrupt
|
|
*
|
|
* Returns:
|
|
* IRQ_HANDLED
|
|
**/
|
|
static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
|
|
{
|
|
struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
|
|
struct ibmvtpm_crq *crq;
|
|
|
|
/* while loop is needed for initial setup (get version and
|
|
* get rtce_size). There should be only one tpm request at any
|
|
* given time.
|
|
*/
|
|
while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
|
|
ibmvtpm_crq_process(crq, ibmvtpm);
|
|
crq->valid = 0;
|
|
smp_wmb();
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* tpm_ibmvtpm_probe - ibm vtpm initialize entry point
|
|
* @vio_dev: vio device struct
|
|
* @id: vio device id struct
|
|
*
|
|
* Return value:
|
|
* 0 - Success
|
|
* Non-zero - Failure
|
|
*/
|
|
static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
|
|
const struct vio_device_id *id)
|
|
{
|
|
struct ibmvtpm_dev *ibmvtpm;
|
|
struct device *dev = &vio_dev->dev;
|
|
struct ibmvtpm_crq_queue *crq_q;
|
|
struct tpm_chip *chip;
|
|
int rc = -ENOMEM, rc1;
|
|
|
|
chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
|
|
if (!ibmvtpm) {
|
|
dev_err(dev, "kzalloc for ibmvtpm failed\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
ibmvtpm->dev = dev;
|
|
ibmvtpm->vdev = vio_dev;
|
|
|
|
crq_q = &ibmvtpm->crq_queue;
|
|
crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
|
|
if (!crq_q->crq_addr) {
|
|
dev_err(dev, "Unable to allocate memory for crq_addr\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
|
|
ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
|
|
CRQ_RES_BUF_SIZE,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
|
|
dev_err(dev, "dma mapping failed\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
|
|
ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
|
|
if (rc == H_RESOURCE)
|
|
rc = ibmvtpm_reset_crq(ibmvtpm);
|
|
|
|
if (rc) {
|
|
dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
|
|
goto reg_crq_cleanup;
|
|
}
|
|
|
|
rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
|
|
tpm_ibmvtpm_driver_name, ibmvtpm);
|
|
if (rc) {
|
|
dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
|
|
goto init_irq_cleanup;
|
|
}
|
|
|
|
rc = vio_enable_interrupts(vio_dev);
|
|
if (rc) {
|
|
dev_err(dev, "Error %d enabling interrupts\n", rc);
|
|
goto init_irq_cleanup;
|
|
}
|
|
|
|
init_waitqueue_head(&ibmvtpm->wq);
|
|
|
|
crq_q->index = 0;
|
|
|
|
TPM_VPRIV(chip) = (void *)ibmvtpm;
|
|
|
|
spin_lock_init(&ibmvtpm->rtce_lock);
|
|
|
|
rc = ibmvtpm_crq_send_init(ibmvtpm);
|
|
if (rc)
|
|
goto init_irq_cleanup;
|
|
|
|
rc = ibmvtpm_crq_get_version(ibmvtpm);
|
|
if (rc)
|
|
goto init_irq_cleanup;
|
|
|
|
rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
|
|
if (rc)
|
|
goto init_irq_cleanup;
|
|
|
|
return tpm_chip_register(chip);
|
|
init_irq_cleanup:
|
|
do {
|
|
rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
|
|
} while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
|
|
reg_crq_cleanup:
|
|
dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
|
|
DMA_BIDIRECTIONAL);
|
|
cleanup:
|
|
if (ibmvtpm) {
|
|
if (crq_q->crq_addr)
|
|
free_page((unsigned long)crq_q->crq_addr);
|
|
kfree(ibmvtpm);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct vio_driver ibmvtpm_driver = {
|
|
.id_table = tpm_ibmvtpm_device_table,
|
|
.probe = tpm_ibmvtpm_probe,
|
|
.remove = tpm_ibmvtpm_remove,
|
|
.get_desired_dma = tpm_ibmvtpm_get_desired_dma,
|
|
.name = tpm_ibmvtpm_driver_name,
|
|
.pm = &tpm_ibmvtpm_pm_ops,
|
|
};
|
|
|
|
/**
|
|
* ibmvtpm_module_init - Initialize ibm vtpm module
|
|
*
|
|
* Return value:
|
|
* 0 -Success
|
|
* Non-zero - Failure
|
|
*/
|
|
static int __init ibmvtpm_module_init(void)
|
|
{
|
|
return vio_register_driver(&ibmvtpm_driver);
|
|
}
|
|
|
|
/**
|
|
* ibmvtpm_module_exit - Teardown ibm vtpm module
|
|
*
|
|
* Return value:
|
|
* Nothing
|
|
*/
|
|
static void __exit ibmvtpm_module_exit(void)
|
|
{
|
|
vio_unregister_driver(&ibmvtpm_driver);
|
|
}
|
|
|
|
module_init(ibmvtpm_module_init);
|
|
module_exit(ibmvtpm_module_exit);
|
|
|
|
MODULE_AUTHOR("adlai@us.ibm.com");
|
|
MODULE_DESCRIPTION("IBM vTPM Driver");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_LICENSE("GPL");
|