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    Subject[PATCH 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM
    From
    Date
    This patch adds a new device driver to support IBM virtual TPM
    (vTPM) for PPC64. This driver provides TPM functionalities
    by communicating with the vTPM adjunct through Hypervisor
    calls (Hcalls) and Command/Response Queue (CRQ) commands.

    Signed-off-by: Ashley Lai <adlai@us.ibm.com>
    ---
    drivers/char/tpm/Kconfig | 8 +
    drivers/char/tpm/Makefile | 1 +
    drivers/char/tpm/tpm.h | 1 +
    drivers/char/tpm/tpm_ibmvtpm.c | 750 ++++++++++++++++++++++++++++++++++++++++
    drivers/char/tpm/tpm_ibmvtpm.h | 83 +++++
    5 files changed, 843 insertions(+), 0 deletions(-)
    create mode 100644 drivers/char/tpm/tpm_ibmvtpm.c
    create mode 100644 drivers/char/tpm/tpm_ibmvtpm.h

    diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
    index c4aac48..915875e 100644
    --- a/drivers/char/tpm/Kconfig
    +++ b/drivers/char/tpm/Kconfig
    @@ -73,4 +73,12 @@ config TCG_INFINEON
    Further information on this driver and the supported hardware
    can be found at http://www.trust.rub.de/projects/linux-device-driver-infineon-tpm/

    +config TCG_IBMVTPM
    + tristate "IBM VTPM Interface"
    + depends on PPC64
    + ---help---
    + If you have IBM virtual TPM (VTPM) support say Yes and it
    + will be accessible from within Linux. To compile this driver
    + as a module, choose M here; the module will be called tpm_ibmvtpm.
    +
    endif # TCG_TPM
    diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
    index beac52f..547509d 100644
    --- a/drivers/char/tpm/Makefile
    +++ b/drivers/char/tpm/Makefile
    @@ -11,3 +11,4 @@ obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o
    obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
    obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
    obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
    +obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
    diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
    index b1c5280..aece857 100644
    --- a/drivers/char/tpm/tpm.h
    +++ b/drivers/char/tpm/tpm.h
    @@ -94,6 +94,7 @@ struct tpm_vendor_specific {
    bool timeout_adjusted;
    unsigned long duration[3]; /* jiffies */
    bool duration_adjusted;
    + void *data;

    wait_queue_head_t read_queue;
    wait_queue_head_t int_queue;
    diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
    new file mode 100644
    index 0000000..491133f
    --- /dev/null
    +++ b/drivers/char/tpm/tpm_ibmvtpm.c
    @@ -0,0 +1,750 @@
    +/*
    + * Copyright (C) 2012 IBM Corporation
    + *
    + * Author: Ashley Lai <adlai@us.ibm.com>
    + *
    + * Maintained by: <tpmdd-devel@lists.sourceforge.net>
    + *
    + * Device driver for TCG/TCPA TPM (trusted platform module).
    + * Specifications at www.trustedcomputinggroup.org
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License as
    + * published by the Free Software Foundation, version 2 of the
    + * License.
    + *
    + */
    +
    +#include <linux/dma-mapping.h>
    +#include <linux/dmapool.h>
    +#include <linux/slab.h>
    +#include <asm/vio.h>
    +#include <asm/irq.h>
    +#include <linux/types.h>
    +#include <linux/list.h>
    +#include <linux/spinlock.h>
    +#include <linux/interrupt.h>
    +#include <linux/wait.h>
    +#include <asm/prom.h>
    +
    +#include "tpm.h"
    +#include "tpm_ibmvtpm.h"
    +
    +static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
    +
    +static struct vio_device_id tpm_ibmvtpm_device_table[] __devinitdata = {
    + { "IBM,vtpm", "IBM,vtpm"},
    + { "", "" }
    +};
    +MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
    +
    +DECLARE_WAIT_QUEUE_HEAD(wq);
    +
    +/**
    + * ibmvtpm_send_crq - Send a CRQ request
    + * @vdev: vio device struct
    + * @w1: first word
    + * @w2: second word
    + *
    + * Return value:
    + * 0 -Sucess
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
    +{
    + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
    +}
    +
    +/**
    + * ibmvtpm_get_data - Retrieve ibm vtpm data
    + * @dev: device struct
    + *
    + * Return value:
    + * vtpm device struct
    + */
    +static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
    +{
    + struct tpm_chip *chip = dev_get_drvdata(dev);
    + if (chip)
    + return (struct ibmvtpm_dev *)chip->vendor.data;
    + return NULL;
    +}
    +
    +/**
    + * tpm_ibmvtpm_recv - Receive data after send
    + * @chip: tpm chip struct
    + * @buf: buffer to read
    + * count: size of buffer
    + *
    + * Return value:
    + * Number of bytes read
    + */
    +static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
    +{
    + struct ibmvtpm_dev *ibmvtpm;
    + u16 len;
    +
    + ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data;
    +
    + if (!ibmvtpm->rtce_buf) {
    + dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
    + return 0;
    + }
    +
    + wait_event_interruptible(wq, ibmvtpm->crq_res.len != 0);
    +
    + if (count < ibmvtpm->crq_res.len) {
    + dev_err(ibmvtpm->dev,
    + "Invalid size in recv: count=%ld, crq_size=%d\n",
    + count, ibmvtpm->crq_res.len);
    + return -EIO;
    + }
    +
    + spin_lock(&ibmvtpm->rtce_lock);
    + memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, ibmvtpm->crq_res.len);
    + memset(ibmvtpm->rtce_buf, 0, ibmvtpm->crq_res.len);
    + ibmvtpm->crq_res.valid = 0;
    + ibmvtpm->crq_res.msg = 0;
    + len = ibmvtpm->crq_res.len;
    + ibmvtpm->crq_res.len = 0;
    + spin_unlock(&ibmvtpm->rtce_lock);
    + return len;
    +}
    +
    +/**
    + * tpm_ibmvtpm_send - Send tpm request
    + * @chip: tpm chip struct
    + * @buf: buffer contains data to send
    + * count: size of buffer
    + *
    + * Return value:
    + * Number of bytes sent
    + */
    +static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
    +{
    + struct ibmvtpm_dev *ibmvtpm;
    + struct ibmvtpm_crq crq;
    + u64 *word = (u64 *) &crq;
    + int rc;
    +
    + ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data;
    +
    + if (!ibmvtpm->rtce_buf) {
    + dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
    + return 0;
    + }
    +
    + if (count > ibmvtpm->rtce_size) {
    + dev_err(ibmvtpm->dev,
    + "Invalid size in send: count=%ld, rtce_size=%d\n",
    + count, ibmvtpm->rtce_size);
    + return -EIO;
    + }
    +
    + spin_lock(&ibmvtpm->rtce_lock);
    + memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
    + crq.valid = (u8)IBMVTPM_VALID_CMD;
    + crq.msg = (u8)VTPM_TPM_COMMAND;
    + crq.len = (u16)count;
    + crq.data = ibmvtpm->rtce_dma_handle;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, word[0], word[1]);
    + if (rc != H_SUCCESS) {
    + dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
    + rc = 0;
    + } else
    + rc = count;
    +
    + spin_unlock(&ibmvtpm->rtce_lock);
    + return rc;
    +}
    +
    +static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
    +{
    + return;
    +}
    +
    +static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
    +{
    + return 0;
    +}
    +
    +/**
    + * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
    + * @ibmvtpm: vtpm device struct
    + *
    + * Return value:
    + * 0 - Success
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
    +{
    + struct ibmvtpm_crq crq;
    + u64 *buf = (u64 *) &crq;
    + int rc;
    +
    + crq.valid = (u8)IBMVTPM_VALID_CMD;
    + crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
    + if (rc != H_SUCCESS)
    + dev_err(ibmvtpm->dev,
    + "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +/**
    + * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
    + * - Note that this is vtpm version and not tpm version
    + * @ibmvtpm: vtpm device struct
    + *
    + * Return value:
    + * 0 - Success
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
    +{
    + struct ibmvtpm_crq crq;
    + u64 *buf = (u64 *) &crq;
    + int rc;
    +
    + crq.valid = (u8)IBMVTPM_VALID_CMD;
    + crq.msg = (u8)VTPM_GET_VERSION;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
    + if (rc != H_SUCCESS)
    + dev_err(ibmvtpm->dev,
    + "ibmvtpm_crq_get_version failed rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +/**
    + * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
    + * @ibmvtpm: vtpm device struct
    + *
    + * Return value:
    + * 0 - Success
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
    +{
    + int rc;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
    + if (rc != H_SUCCESS)
    + dev_err(ibmvtpm->dev,
    + "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +/**
    + * ibmvtpm_crq_send_init - Send a CRQ initialize message
    + * @ibmvtpm: vtpm device struct
    + *
    + * Return value:
    + * 0 - Success
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
    +{
    + int rc;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
    + if (rc != H_SUCCESS)
    + dev_err(ibmvtpm->dev,
    + "ibmvtpm_crq_send_init failed rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +/**
    + * tpm_ibmvtpm_remove - ibm vtpm remove entry point
    + * @vdev: vio device struct
    + *
    + * Return value:
    + * 0
    + */
    +static int __devexit tpm_ibmvtpm_remove(struct vio_dev *vdev)
    +{
    + struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
    + int rc = 0;
    +
    + free_irq(vdev->irq, ibmvtpm);
    + tasklet_kill(&ibmvtpm->tasklet);
    +
    + do {
    + if (rc)
    + msleep(100);
    + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
    + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
    +
    + dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
    + CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
    + free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
    +
    + if (ibmvtpm->rtce_buf) {
    + dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
    + ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
    + kfree(ibmvtpm->rtce_buf);
    + }
    +
    + tpm_remove_hardware(ibmvtpm->dev);
    +
    + kfree(ibmvtpm);
    +
    + return 0;
    +}
    +
    +/**
    + * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
    + * @vdev: vio device struct
    + *
    + * Return value:
    + * Number of bytes the driver needs to DMA map
    + */
    +static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
    +{
    + struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
    + return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
    +}
    +
    +/**
    + * tpm_ibmvtpm_suspend - Suspend
    + * @dev: device struct
    + *
    + * Return value:
    + * 0
    + */
    +static int tpm_ibmvtpm_suspend(struct device *dev)
    +{
    + struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
    + struct ibmvtpm_crq crq;
    + u64 *buf = (u64 *) &crq;
    + int rc = 0;
    +
    + crq.valid = (u8)IBMVTPM_VALID_CMD;
    + crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
    +
    + rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
    + if (rc != H_SUCCESS)
    + dev_err(ibmvtpm->dev,
    + "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +/**
    + * ibmvtpm_reset_crq - Reset CRQ
    + * @ibmvtpm: ibm vtpm struct
    + *
    + * Return value:
    + * 0 - Success
    + * Non-zero - Failure
    + */
    +static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
    +{
    + int rc = 0;
    +
    + do {
    + if (rc)
    + msleep(100);
    + rc = plpar_hcall_norets(H_FREE_CRQ,
    + ibmvtpm->vdev->unit_address);
    + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
    +
    + memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
    + ibmvtpm->crq_queue.index = 0;
    +
    + return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
    + ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
    +}
    +
    +/**
    + * tpm_ibmvtpm_resume - Resume from suspend
    + * @dev: device struct
    + *
    + * Return value:
    + * 0
    + */
    +static int tpm_ibmvtpm_resume(struct device *dev)
    +{
    + struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
    + unsigned long flags;
    + int rc = 0;
    +
    + do {
    + if (rc)
    + msleep(100);
    + rc = plpar_hcall_norets(H_ENABLE_CRQ,
    + ibmvtpm->vdev->unit_address);
    + } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
    +
    + if (rc) {
    + dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
    + return rc;
    + }
    +
    + spin_lock_irqsave(&ibmvtpm->lock, flags);
    + vio_disable_interrupts(ibmvtpm->vdev);
    + tasklet_schedule(&ibmvtpm->tasklet);
    + spin_unlock_irqrestore(&ibmvtpm->lock, flags);
    +
    + rc = ibmvtpm_crq_send_init(ibmvtpm);
    + if (rc)
    + dev_err(dev, "Error send_init rc=%d\n", rc);
    +
    + return rc;
    +}
    +
    +static const struct file_operations ibmvtpm_ops = {
    + .owner = THIS_MODULE,
    + .llseek = no_llseek,
    + .open = tpm_open,
    + .read = tpm_read,
    + .write = tpm_write,
    + .release = tpm_release,
    +};
    +
    +static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
    +static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
    +static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
    +static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
    +static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
    +static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
    + NULL);
    +static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
    +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
    +static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
    +static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
    +
    +static struct attribute *ibmvtpm_attrs[] = {
    + &dev_attr_pubek.attr,
    + &dev_attr_pcrs.attr,
    + &dev_attr_enabled.attr,
    + &dev_attr_active.attr,
    + &dev_attr_owned.attr,
    + &dev_attr_temp_deactivated.attr,
    + &dev_attr_caps.attr,
    + &dev_attr_cancel.attr,
    + &dev_attr_durations.attr,
    + &dev_attr_timeouts.attr, NULL,
    +};
    +
    +static struct attribute_group ibmvtpm_attr_grp = { .attrs = ibmvtpm_attrs };
    +
    +static const struct tpm_vendor_specific tpm_ibmvtpm = {
    + .recv = tpm_ibmvtpm_recv,
    + .send = tpm_ibmvtpm_send,
    + .cancel = tpm_ibmvtpm_cancel,
    + .status = tpm_ibmvtpm_status,
    + .req_complete_mask = 0,
    + .req_complete_val = 0,
    + .req_canceled = 0,
    + .attr_group = &ibmvtpm_attr_grp,
    + .miscdev = { .fops = &ibmvtpm_ops, },
    +};
    +
    +static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
    + .suspend = tpm_ibmvtpm_suspend,
    + .resume = tpm_ibmvtpm_resume,
    +};
    +
    +/**
    + * ibmvtpm_crq_get_next - Get next responded crq
    + * @ibmvtpm vtpm device struct
    + *
    + * Return value:
    + * vtpm crq pointer
    + */
    +static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
    +{
    + struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
    + struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
    +
    + if (crq->valid & VTPM_MSG_RES) {
    + if (++crq_q->index == crq_q->num_entry)
    + crq_q->index = 0;
    + rmb();
    + } else
    + crq = NULL;
    + return crq;
    +}
    +
    +/**
    + * ibmvtpm_crq_process - Process responded crq
    + * @crq crq to be processed
    + * @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;
    + }
    + return;
    + case IBMVTPM_VALID_CMD:
    + switch (crq->msg) {
    + case VTPM_GET_RTCE_BUFFER_SIZE_RES:
    + if (crq->len <= 0) {
    + dev_err(ibmvtpm->dev, "Invalid rtce size\n");
    + return;
    + }
    + ibmvtpm->rtce_size = crq->len;
    + ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
    + GFP_KERNEL);
    + 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 = crq->data;
    + return;
    + case VTPM_TPM_COMMAND_RES:
    + ibmvtpm->crq_res.valid = crq->valid;
    + ibmvtpm->crq_res.msg = crq->msg;
    + ibmvtpm->crq_res.len = crq->len;
    + ibmvtpm->crq_res.data = crq->data;
    + wake_up_interruptible(&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;
    + unsigned long flags;
    +
    + spin_lock_irqsave(&ibmvtpm->lock, flags);
    + vio_disable_interrupts(ibmvtpm->vdev);
    + tasklet_schedule(&ibmvtpm->tasklet);
    + spin_unlock_irqrestore(&ibmvtpm->lock, flags);
    +
    + return IRQ_HANDLED;
    +}
    +
    +/**
    + * ibmvtpm_tasklet - Interrupt handler tasklet
    + * @data: ibm vtpm device struct
    + *
    + * Returns:
    + * Nothing
    + **/
    +static void ibmvtpm_tasklet(void *data)
    +{
    + struct ibmvtpm_dev *ibmvtpm = data;
    + struct ibmvtpm_crq *crq;
    + unsigned long flags;
    +
    + spin_lock_irqsave(&ibmvtpm->lock, flags);
    + while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
    + ibmvtpm_crq_process(crq, ibmvtpm);
    + crq->valid = 0;
    + wmb();
    + }
    +
    + vio_enable_interrupts(ibmvtpm->vdev);
    + spin_unlock_irqrestore(&ibmvtpm->lock, flags);
    +}
    +
    +/**
    + * 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 __devinit 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 = tpm_register_hardware(dev, &tpm_ibmvtpm);
    + if (!chip) {
    + dev_err(dev, "tpm_register_hardware failed\n");
    + return -ENODEV;
    + }
    +
    + ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
    + if (!ibmvtpm) {
    + dev_err(dev, "kzalloc for ibmvtpm failed\n");
    + goto cleanup;
    + }
    +
    + 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;
    + }
    +
    + tasklet_init(&ibmvtpm->tasklet, (void *)ibmvtpm_tasklet,
    + (unsigned long)ibmvtpm);
    +
    + 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;
    + }
    +
    + crq_q->index = 0;
    +
    + ibmvtpm->dev = dev;
    + ibmvtpm->vdev = vio_dev;
    + chip->vendor.data = (void *)ibmvtpm;
    +
    + spin_lock_init(&ibmvtpm->lock);
    + 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 rc;
    +init_irq_cleanup:
    + tasklet_kill(&ibmvtpm->tasklet);
    + 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);
    + }
    +
    + tpm_remove_hardware(dev);
    +
    + 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");
    diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h
    new file mode 100644
    index 0000000..fb930dd
    --- /dev/null
    +++ b/drivers/char/tpm/tpm_ibmvtpm.h
    @@ -0,0 +1,83 @@
    +/*
    + * Copyright (C) 2012 IBM Corporation
    + *
    + * Author: Ashley Lai <adlai@us.ibm.com>
    + *
    + * Maintained by: <tpmdd-devel@lists.sourceforge.net>
    + *
    + * Device driver for TCG/TCPA TPM (trusted platform module).
    + * Specifications at www.trustedcomputinggroup.org
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License as
    + * published by the Free Software Foundation, version 2 of the
    + * License.
    + *
    + * These difference are required on power because the device must be
    + * discovered through the device tree and iomap must be used to get
    + * around the need for holes in the io_page_mask. This does not happen
    + * automatically because the tpm is not a normal pci device and lives
    + * under the root node.
    + *
    + */
    +
    +#ifndef __TPM_IBMVTPM_H__
    +#define __TPM_IBMVTPM_H__
    +
    +/* vTPM Message Format 1 */
    +struct ibmvtpm_crq {
    + u8 valid;
    + u8 msg;
    + u16 len;
    + u32 data;
    + u64 reserved;
    +} __attribute__((packed, aligned(8)));
    +
    +struct ibmvtpm_crq_queue {
    + struct ibmvtpm_crq *crq_addr;
    + u32 index;
    + u32 num_entry;
    +};
    +
    +struct ibmvtpm_dev {
    + struct device *dev;
    + struct vio_dev *vdev;
    + struct ibmvtpm_crq_queue crq_queue;
    + dma_addr_t crq_dma_handle;
    + spinlock_t lock;
    + struct tasklet_struct tasklet;
    + u32 rtce_size;
    + void __iomem *rtce_buf;
    + dma_addr_t rtce_dma_handle;
    + spinlock_t rtce_lock;
    + struct ibmvtpm_crq crq_res;
    + u32 vtpm_version;
    +};
    +
    +#define CRQ_RES_BUF_SIZE PAGE_SIZE
    +
    +/* Initialize CRQ */
    +#define INIT_CRQ_CMD 0xC001000000000000LL /* Init cmd */
    +#define INIT_CRQ_COMP_CMD 0xC002000000000000LL /* Init complete cmd */
    +#define INIT_CRQ_RES 0x01 /* Init respond */
    +#define INIT_CRQ_COMP_RES 0x02 /* Init complete respond */
    +#define VALID_INIT_CRQ 0xC0 /* Valid command for init crq */
    +
    +/* vTPM CRQ response is the message type | 0x80 */
    +#define VTPM_MSG_RES 0x80
    +#define IBMVTPM_VALID_CMD 0x80
    +
    +/* vTPM CRQ message types */
    +#define VTPM_GET_VERSION 0x01
    +#define VTPM_GET_VERSION_RES (0x01 | VTPM_MSG_RES)
    +
    +#define VTPM_TPM_COMMAND 0x02
    +#define VTPM_TPM_COMMAND_RES (0x02 | VTPM_MSG_RES)
    +
    +#define VTPM_GET_RTCE_BUFFER_SIZE 0x03
    +#define VTPM_GET_RTCE_BUFFER_SIZE_RES (0x03 | VTPM_MSG_RES)
    +
    +#define VTPM_PREPARE_TO_SUSPEND 0x04
    +#define VTPM_PREPARE_TO_SUSPEND_RES (0x04 | VTPM_MSG_RES)
    +
    +#endif
    --
    1.7.1



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