Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932489Ab2HVVmG (ORCPT ); Wed, 22 Aug 2012 17:42:06 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:39226 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932094Ab2HVVmB (ORCPT ); Wed, 22 Aug 2012 17:42:01 -0400 Date: Wed, 22 Aug 2012 16:42:18 -0500 From: Kent Yoder To: Ashley Lai Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, tpmdd-devel@lists.sourceforge.net, benh@kernel.crashing.org, linuxppc-dev@lists.ozlabs.org, rcj@linux.vnet.ibm.com, adlai@us.ibm.com Subject: Re: [PATCH V3 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM Message-ID: <20120822214217.GB13519@linux.vnet.ibm.com> References: <1344987282.4430.26.camel@footlong> <1345670263.25124.7.camel@footlong> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1345670263.25124.7.camel@footlong> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12082221-5930-0000-0000-00000B28F890 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 25249 Lines: 915 On Wed, Aug 22, 2012 at 04:17:43PM -0500, Ashley Lai wrote: > This patch adds a new device driver to support IBM virtual TPM > (vTPM) for PPC64. IBM vTPM is supported through the adjunct > partition with firmware release 740 or higher. With vTPM > support, each lpar is able to have its own vTPM without the > physical TPM hardware. > > This driver provides TPM functionalities by communicating with > the vTPM adjunct partition through Hypervisor calls (Hcalls) > and Command/Response Queue (CRQ) commands. Thanks Ashley, I'll include this in my next pull request to James. Kent > Signed-off-by: Ashley Lai > --- > > Oopps... I forgot to remove some invalid comments. Please use this patch for 1/3. > > drivers/char/tpm/Kconfig | 8 + > drivers/char/tpm/Makefile | 1 + > drivers/char/tpm/tpm.h | 1 + > drivers/char/tpm/tpm_ibmvtpm.c | 749 ++++++++++++++++++++++++++++++++++++++++ > drivers/char/tpm/tpm_ibmvtpm.h | 77 ++++ > 5 files changed, 836 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 645136e..870fde7 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -100,6 +100,7 @@ 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..efc4ab3 > --- /dev/null > +++ b/drivers/char/tpm/tpm_ibmvtpm.c > @@ -0,0 +1,749 @@ > +/* > + * Copyright (C) 2012 IBM Corporation > + * > + * Author: Ashley Lai > + * > + * Maintained by: > + * > + * 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 > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#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..4296eb4 > --- /dev/null > +++ b/drivers/char/tpm/tpm_ibmvtpm.h > @@ -0,0 +1,77 @@ > +/* > + * Copyright (C) 2012 IBM Corporation > + * > + * Author: Ashley Lai > + * > + * Maintained by: > + * > + * 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. > + * > + */ > + > +#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 > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/