Change log V3:
- Replaced TPM_NO_EVENT_LOG macro with stubs
- Removed tpm_noeventlog.c file
- Called of_node_put() before return in tpm_of.c
Change log V2:
- Removed unnecessary tpm_bios_log_setup and tpm_bios_log_teardown
functions in tpm_eventlog.h (patch 3/3).
- Added more descriptions on vTPM (patch 1/3).
These patches add support for IBM vTPM for PPC64. This new device driver
works on firmware that supports vTPM (firmware release 740 or higher).
Tested on Power7+ system with firmware level ZM770_001.
Applied to Kent Yoder tree at:
https://github.com/shpedoikal/linux/tree/v3.6-rc1-tpmdd-staging
Ashley Lai (3):
drivers/char/tpm: Add new device driver to support IBM vTPM
PPC64: Add support for instantiating SML from Open Firmware
drivers/char/tpm: Add securityfs support for event log
arch/powerpc/kernel/prom_init.c | 62 ++++
drivers/char/tpm/Kconfig | 8 +
drivers/char/tpm/Makefile | 6 +
drivers/char/tpm/tpm.h | 13 +-
drivers/char/tpm/tpm_eventlog.h | 15 +
drivers/char/tpm/tpm_ibmvtpm.c | 749 +++++++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm_ibmvtpm.h | 83 +++++
drivers/char/tpm/tpm_of.c | 73 ++++
8 files changed, 997 insertions(+), 12 deletions(-)
create mode 100644 drivers/char/tpm/tpm_ibmvtpm.c
create mode 100644 drivers/char/tpm/tpm_ibmvtpm.h
create mode 100644 drivers/char/tpm/tpm_of.c
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.
Signed-off-by: Ashley Lai <[email protected]>
---
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 | 83 +++++
5 files changed, 842 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 <[email protected]>
+ *
+ * Maintained by: <[email protected]>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at http://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("[email protected]");
+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 <[email protected]>
+ *
+ * Maintained by: <[email protected]>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at http://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
This patch retrieves the event log data from the device tree
during file open. The event log data will then displayed through
securityfs.
Signed-off-by: Ashley Lai <[email protected]>
---
drivers/char/tpm/Makefile | 5 +++
drivers/char/tpm/tpm.h | 12 ------
drivers/char/tpm/tpm_eventlog.h | 15 ++++++++
drivers/char/tpm/tpm_of.c | 73 +++++++++++++++++++++++++++++++++++++++
4 files changed, 93 insertions(+), 12 deletions(-)
create mode 100644 drivers/char/tpm/tpm_of.c
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 547509d..9080cc4 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -5,6 +5,11 @@ obj-$(CONFIG_TCG_TPM) += tpm.o
ifdef CONFIG_ACPI
obj-$(CONFIG_TCG_TPM) += tpm_bios.o
tpm_bios-objs += tpm_eventlog.o tpm_acpi.o
+else
+ifdef CONFIG_TCG_IBMVTPM
+ obj-$(CONFIG_TCG_TPM) += tpm_bios.o
+ tpm_bios-objs += tpm_eventlog.o tpm_of.o
+endif
endif
obj-$(CONFIG_TCG_TIS) += tpm_tis.o
obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 870fde7..f1af738 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -327,15 +327,3 @@ extern int tpm_pm_suspend(struct device *);
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
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 8e23ccd..e7da086 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -68,4 +68,19 @@ enum tcpa_pc_event_ids {
};
int read_log(struct tpm_bios_log *log);
+
+#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
+ defined(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
+
#endif
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
new file mode 100644
index 0000000..98ba2bd
--- /dev/null
+++ b/drivers/char/tpm/tpm_of.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012 IBM Corporation
+ *
+ * Author: Ashley Lai <[email protected]>
+ *
+ * Maintained by: <[email protected]>
+ *
+ * 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__);
+ goto cleanup_eio;
+ }
+ if (*sizep == 0) {
+ pr_err("%s: ERROR - event log area empty\n", __func__);
+ goto cleanup_eio;
+ }
+
+ basep = of_get_property(np, "linux,sml-base", NULL);
+ if (basep == NULL) {
+ pr_err(KERN_ERR "%s: ERROR - SML not found\n", __func__);
+ goto cleanup_eio;
+ }
+
+ of_node_put(np);
+ 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;
+
+cleanup_eio:
+ of_node_put(np);
+ return -EIO;
+}
--
1.7.1
This patch instantiate Stored Measurement Log (SML) and put the
log address and size in the device tree.
Signed-off-by: Ashley Lai <[email protected]>
---
arch/powerpc/kernel/prom_init.c | 62 +++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 0794a30..e144498 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1624,6 +1624,63 @@ 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 || size == 0) {
+ prom_printf("SML get handover size failed\n");
+ 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 +2973,11 @@ 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
On Tue, Aug 14, 2012 at 06:23:58PM -0500, Ashley Lai wrote:
> Change log V3:
> - Replaced TPM_NO_EVENT_LOG macro with stubs
> - Removed tpm_noeventlog.c file
> - Called of_node_put() before return in tpm_of.c
>
> Change log V2:
> - Removed unnecessary tpm_bios_log_setup and tpm_bios_log_teardown
> functions in tpm_eventlog.h (patch 3/3).
> - Added more descriptions on vTPM (patch 1/3).
>
> These patches add support for IBM vTPM for PPC64. This new device driver
> works on firmware that supports vTPM (firmware release 740 or higher).
>
> Tested on Power7+ system with firmware level ZM770_001.
>
> Applied to Kent Yoder tree at:
> https://github.com/shpedoikal/linux/tree/v3.6-rc1-tpmdd-staging
Thanks Ashley, I've added the patches to that tree.
Kent
>
> Ashley Lai (3):
> drivers/char/tpm: Add new device driver to support IBM vTPM
> PPC64: Add support for instantiating SML from Open Firmware
> drivers/char/tpm: Add securityfs support for event log
>
> arch/powerpc/kernel/prom_init.c | 62 ++++
> drivers/char/tpm/Kconfig | 8 +
> drivers/char/tpm/Makefile | 6 +
> drivers/char/tpm/tpm.h | 13 +-
> drivers/char/tpm/tpm_eventlog.h | 15 +
> drivers/char/tpm/tpm_ibmvtpm.c | 749 +++++++++++++++++++++++++++++++++++++++
> drivers/char/tpm/tpm_ibmvtpm.h | 83 +++++
> drivers/char/tpm/tpm_of.c | 73 ++++
> 8 files changed, 997 insertions(+), 12 deletions(-)
> create mode 100644 drivers/char/tpm/tpm_ibmvtpm.c
> create mode 100644 drivers/char/tpm/tpm_ibmvtpm.h
> create mode 100644 drivers/char/tpm/tpm_of.c
>
>
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.
Signed-off-by: Ashley Lai <[email protected]>
---
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 <[email protected]>
+ *
+ * Maintained by: <[email protected]>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at http://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("[email protected]");
+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 <[email protected]>
+ *
+ * Maintained by: <[email protected]>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at http://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
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 <[email protected]>
> ---
>
> 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 <[email protected]>
> + *
> + * Maintained by: <[email protected]>
> + *
> + * Device driver for TCG/TCPA TPM (trusted platform module).
> + * Specifications at http://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("[email protected]");
> +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 <[email protected]>
> + *
> + * Maintained by: <[email protected]>
> + *
> + * Device driver for TCG/TCPA TPM (trusted platform module).
> + * Specifications at http://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
>
>