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When the TPM response reception is interrupted in the wait_event_interruptable call, the TPM is still busy processing the command and will only deliver the response later. So we have to wait for an outstanding response before sending a new request to avoid trying to put a 2nd request into the CRQ. Also reset the res_len before sending a command so we will end up in that wait_event_interruptable() waiting for the response rather than reading the command packet as a response. The easiest way to trigger the problem is to run the following cd /sys/device/vio/71000004 while :; cat pcrs >/dev/null; done And press Ctrl-C. This will then display an error tpm_ibmvtpm 71000004: tpm_transmit: tpm_recv: error -4 followed by several other errors once interaction with the TPM resumes. tpm_ibmvtpm 71000004: A TPM error (101) occurred attempting to determine the number of PCRS. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Tested-by: Hon Ching(Vicky) Lo <honclo@linux.vnet.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Ashley Lai <ashley@ashleylai.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Acked-by: Peter Huewe <peterhuewe@gmx.de>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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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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};
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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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