* [PATCH 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM
2012-08-07 19:29 [PATCH 0/3] tpm: Add new vTPM device driver for PPC64 Ashley Lai
@ 2012-08-07 19:56 ` Ashley Lai
2012-08-07 19:56 ` [PATCH 2/3] PPC64: Add support for instantiating SML from Open Firmware Ashley Lai
2012-08-07 19:57 ` [PATCH 3/3] drivers/char/tpm: Add securityfs support for event log Ashley Lai
2 siblings, 0 replies; 7+ messages in thread
From: Ashley Lai @ 2012-08-07 19:56 UTC (permalink / raw)
To: linux-kernel
Cc: rcj, adlai, linux-security-module, tpmdd-devel, adlai, key,
linuxppc-dev
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>
---
| 8 +
| 1 +
| 1 +
| 750 ++++++++++++++++++++++++++++++++++++++++
| 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
--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
--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
--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;
--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");
--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
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH 2/3] PPC64: Add support for instantiating SML from Open Firmware
2012-08-07 19:29 [PATCH 0/3] tpm: Add new vTPM device driver for PPC64 Ashley Lai
2012-08-07 19:56 ` [PATCH 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM Ashley Lai
@ 2012-08-07 19:56 ` Ashley Lai
2012-08-07 19:57 ` [PATCH 3/3] drivers/char/tpm: Add securityfs support for event log Ashley Lai
2 siblings, 0 replies; 7+ messages in thread
From: Ashley Lai @ 2012-08-07 19:56 UTC (permalink / raw)
To: linux-kernel
Cc: rcj, adlai, linux-security-module, tpmdd-devel, adlai, key,
linuxppc-dev
This patch instantiate Stored Measurement Log (SML) and put the
log address and size in the device tree.
Signed-off-by: Ashley Lai <adlai@us.ibm.com>
---
| 64 +++++++++++++++++++++++++++++++++++++++
1 files changed, 64 insertions(+), 0 deletions(-)
--git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 1b488e5..3f54bd4 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1624,6 +1624,65 @@ static void __init prom_instantiate_rtas(void)
#ifdef CONFIG_PPC64
/*
+ * Allocate room for and instantiate Stored Measurement Log (SML)
+ */
+static void __init prom_instantiate_sml(void)
+{
+ phandle ibmvtpm_node;
+ ihandle ibmvtpm_inst;
+ u32 entry = 0, size = 0;
+ u64 base;
+
+ prom_debug("prom_instantiate_sml: start...\n");
+
+ ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
+ prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
+ if (!PHANDLE_VALID(ibmvtpm_node))
+ return;
+
+ ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
+ if (!IHANDLE_VALID(ibmvtpm_inst)) {
+ prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
+ return;
+ }
+
+ if (call_prom_ret("call-method", 2, 2, &size,
+ ADDR("sml-get-handover-size"),
+ ibmvtpm_inst) != 0) {
+ prom_printf("SML get handover size failed\n");
+ return;
+ }
+ if (size == 0)
+ return;
+
+ base = alloc_down(size, PAGE_SIZE, 0);
+ if (base == 0)
+ prom_panic("Could not allocate memory for sml\n");
+
+ prom_printf("instantiating sml at 0x%x...", base);
+
+ if (call_prom_ret("call-method", 4, 2, &entry,
+ ADDR("sml-handover"),
+ ibmvtpm_inst, size, base) != 0 || entry == 0) {
+ prom_printf("SML handover failed\n");
+ return;
+ }
+ prom_printf(" done\n");
+
+ reserve_mem(base, size);
+
+ prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
+ &base, sizeof(base));
+ prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
+ &size, sizeof(size));
+
+ prom_debug("sml base = 0x%x\n", base);
+ prom_debug("sml size = 0x%x\n", (long)size);
+
+ prom_debug("prom_instantiate_sml: end...\n");
+}
+
+/*
* Allocate room for and initialize TCE tables
*/
static void __init prom_initialize_tce_table(void)
@@ -2916,6 +2975,11 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
prom_instantiate_opal();
#endif
+#ifdef CONFIG_PPC64
+ /* instantiate sml */
+ prom_instantiate_sml();
+#endif
+
/*
* On non-powermacs, put all CPUs in spin-loops.
*
--
1.7.1
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH 3/3] drivers/char/tpm: Add securityfs support for event log
2012-08-07 19:29 [PATCH 0/3] tpm: Add new vTPM device driver for PPC64 Ashley Lai
2012-08-07 19:56 ` [PATCH 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM Ashley Lai
2012-08-07 19:56 ` [PATCH 2/3] PPC64: Add support for instantiating SML from Open Firmware Ashley Lai
@ 2012-08-07 19:57 ` Ashley Lai
2012-08-09 15:57 ` Kent Yoder
2012-08-09 20:52 ` Ashley Lai
2 siblings, 2 replies; 7+ messages in thread
From: Ashley Lai @ 2012-08-07 19:57 UTC (permalink / raw)
To: linux-kernel
Cc: rcj, adlai, linux-security-module, tpmdd-devel, adlai, key,
linuxppc-dev
This patch retrieves the event log from the device tree and the
event log data will be displayed through securityfs.
Signed-off-by: Ashley Lai <adlai@us.ibm.com>
---
| 8 ++++-
| 12 ------
| 7 ++++
| 24 +++++++++++++
| 21 +++++++++++
| 68 +++++++++++++++++++++++++++++++++++++
6 files changed, 127 insertions(+), 13 deletions(-)
create mode 100644 drivers/char/tpm/tpm_noeventlog.c
create mode 100644 drivers/char/tpm/tpm_of.c
--git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 547509d..b53da57 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -2,9 +2,15 @@
# Makefile for the kernel tpm device drivers.
#
obj-$(CONFIG_TCG_TPM) += tpm.o
+obj-$(CONFIG_TCG_TPM) += tpm_bios.o
ifdef CONFIG_ACPI
- obj-$(CONFIG_TCG_TPM) += tpm_bios.o
tpm_bios-objs += tpm_eventlog.o tpm_acpi.o
+else
+ifdef CONFIG_TCG_IBMVTPM
+ tpm_bios-objs += tpm_eventlog.o tpm_of.o
+else
+ tpm_bios-objs += tpm_eventlog.o tpm_noeventlog.o
+endif
endif
obj-$(CONFIG_TCG_TIS) += tpm_tis.o
obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o
--git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index aece857..08f6a07 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -304,15 +304,3 @@ extern int tpm_pm_suspend(struct device *, pm_message_t);
extern int tpm_pm_resume(struct device *);
extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
wait_queue_head_t *);
-#ifdef CONFIG_ACPI
-extern struct dentry ** tpm_bios_log_setup(char *);
-extern void tpm_bios_log_teardown(struct dentry **);
-#else
-static inline struct dentry ** tpm_bios_log_setup(char *name)
-{
- return NULL;
-}
-static inline void tpm_bios_log_teardown(struct dentry **dir)
-{
-}
-#endif
--git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index 84ddc55..814b202 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -24,6 +24,7 @@
#include <linux/security.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/of.h>
#include "tpm.h"
#include "tpm_eventlog.h"
@@ -369,6 +370,9 @@ struct dentry **tpm_bios_log_setup(char *name)
{
struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
+ if (TPM_NO_EVENT_LOG)
+ return NULL;
+
tpm_dir = securityfs_create_dir(name, NULL);
if (is_bad(tpm_dir))
goto out;
@@ -412,6 +416,9 @@ void tpm_bios_log_teardown(struct dentry **lst)
{
int i;
+ if (TPM_NO_EVENT_LOG)
+ return;
+
for (i = 0; i < 3; i++)
securityfs_remove(lst[i]);
}
--git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 8e23ccd..5fbea94 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -68,4 +68,28 @@ enum tcpa_pc_event_ids {
};
int read_log(struct tpm_bios_log *log);
+
+#if defined(CONFIG_ACPI) || defined(CONFIG_PPC64)
+extern struct dentry **tpm_bios_log_setup(char *);
+extern void tpm_bios_log_teardown(struct dentry **);
+#else
+static inline struct dentry **tpm_bios_log_setup(char *name)
+{
+ return NULL;
+}
+static inline void tpm_bios_log_teardown(struct dentry **dir)
+{
+}
+#endif
+
+#ifdef CONFIG_PPC64
+#define TPM_NO_EVENT_LOG !of_find_node_by_name(NULL, "ibm,vtpm")
+#else
+#ifdef CONFIG_ACPI
+#define TPM_NO_EVENT_LOG 0
+#else
+#define TPM_NO_EVENT_LOG 1
+#endif
+#endif
+
#endif
--git a/drivers/char/tpm/tpm_noeventlog.c b/drivers/char/tpm/tpm_noeventlog.c
new file mode 100644
index 0000000..f30a2bf
--- /dev/null
+++ b/drivers/char/tpm/tpm_noeventlog.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2012 IBM Corporation
+ *
+ * Author: Ashley Lai <adlai@us.ibm.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/slab.h>
+#include "tpm_eventlog.h"
+
+int read_log(struct tpm_bios_log *log)
+{
+ return -EINVAL;
+}
--git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
new file mode 100644
index 0000000..6d44adb
--- /dev/null
+++ b/drivers/char/tpm/tpm_of.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012 IBM Corporation
+ *
+ * Author: Ashley Lai <adlai@us.ibm.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * Read the event log created by the firmware on PPC64
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include "tpm.h"
+#include "tpm_eventlog.h"
+
+int read_log(struct tpm_bios_log *log)
+{
+ struct device_node *np;
+ const u32 *sizep;
+ const __be64 *basep;
+
+ if (log->bios_event_log != NULL) {
+ pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
+ return -EFAULT;
+ }
+
+ np = of_find_node_by_name(NULL, "ibm,vtpm");
+ if (!np) {
+ pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
+ return -ENODEV;
+ }
+
+ sizep = of_get_property(np, "linux,sml-size", NULL);
+ if (sizep == NULL) {
+ pr_err("%s: ERROR - SML size not found\n", __func__);
+ return -EIO;
+ }
+ if (*sizep == 0) {
+ pr_err("%s: ERROR - event log area empty\n", __func__);
+ return -EIO;
+ }
+
+ basep = of_get_property(np, "linux,sml-base", NULL);
+ if (basep == NULL) {
+ pr_err(KERN_ERR "%s: ERROR - SML not found\n", __func__);
+ return -EIO;
+ }
+
+ log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);
+ if (!log->bios_event_log) {
+ pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ log->bios_event_log_end = log->bios_event_log + *sizep;
+
+ memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), *sizep);
+
+ return 0;
+}
--
1.7.1
^ permalink raw reply related [flat|nested] 7+ messages in thread