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d8d74ea3c0
Synchronize with the results from the CRQs before continuing with
the initialization. This avoids trying to send TPM commands while
the rtce buffer has not been allocated, yet.
This patch fixes an existing race condition that may occurr if the
hypervisor does not quickly respond to the VTPM_GET_RTCE_BUFFER_SIZE
request sent during initialization and therefore the ibmvtpm->rtce_buf
has not been allocated at the time the first TPM command is sent.
Fixes: 132f762947 ("drivers/char/tpm: Add new device driver to support IBM vTPM")
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Acked-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 IBM Corporation
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*
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* Author: Ashley Lai <ashleydlai@gmail.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*/
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#ifndef __TPM_IBMVTPM_H__
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#define __TPM_IBMVTPM_H__
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/* vTPM Message Format 1 */
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struct ibmvtpm_crq {
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u8 valid;
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u8 msg;
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__be16 len;
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__be32 data;
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__be64 reserved;
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} __attribute__((packed, aligned(8)));
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struct ibmvtpm_crq_queue {
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struct ibmvtpm_crq *crq_addr;
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u32 index;
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u32 num_entry;
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wait_queue_head_t wq;
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};
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struct ibmvtpm_dev {
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struct device *dev;
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struct vio_dev *vdev;
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struct ibmvtpm_crq_queue crq_queue;
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dma_addr_t crq_dma_handle;
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u32 rtce_size;
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void __iomem *rtce_buf;
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dma_addr_t rtce_dma_handle;
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spinlock_t rtce_lock;
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wait_queue_head_t wq;
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u16 res_len;
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u32 vtpm_version;
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bool tpm_processing_cmd;
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};
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#define CRQ_RES_BUF_SIZE PAGE_SIZE
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/* Initialize CRQ */
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#define INIT_CRQ_CMD 0xC001000000000000LL /* Init cmd */
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#define INIT_CRQ_COMP_CMD 0xC002000000000000LL /* Init complete cmd */
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#define INIT_CRQ_RES 0x01 /* Init respond */
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#define INIT_CRQ_COMP_RES 0x02 /* Init complete respond */
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#define VALID_INIT_CRQ 0xC0 /* Valid command for init crq */
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/* vTPM CRQ response is the message type | 0x80 */
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#define VTPM_MSG_RES 0x80
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#define IBMVTPM_VALID_CMD 0x80
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/* vTPM CRQ message types */
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#define VTPM_GET_VERSION 0x01
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#define VTPM_GET_VERSION_RES (0x01 | VTPM_MSG_RES)
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#define VTPM_TPM_COMMAND 0x02
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#define VTPM_TPM_COMMAND_RES (0x02 | VTPM_MSG_RES)
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#define VTPM_GET_RTCE_BUFFER_SIZE 0x03
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#define VTPM_GET_RTCE_BUFFER_SIZE_RES (0x03 | VTPM_MSG_RES)
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#define VTPM_PREPARE_TO_SUSPEND 0x04
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#define VTPM_PREPARE_TO_SUSPEND_RES (0x04 | VTPM_MSG_RES)
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#endif
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