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808 lines
18 KiB
808 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2004 IBM Corporation |
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* Copyright (C) 2014 Intel Corporation |
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* |
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* Authors: |
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* Leendert van Doorn <[email protected]> |
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* Dave Safford <[email protected]> |
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* Reiner Sailer <[email protected]> |
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* Kylene Hall <[email protected]> |
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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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#include <linux/poll.h> |
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#include <linux/slab.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/freezer.h> |
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#include <linux/tpm_eventlog.h> |
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#include "tpm.h" |
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#define TPM_MAX_ORDINAL 243 |
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|
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/* |
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* Array with one entry per ordinal defining the maximum amount |
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* of time the chip could take to return the result. The ordinal |
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* designation of short, medium or long is defined in a table in |
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* TCG Specification TPM Main Part 2 TPM Structures Section 17. The |
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* values of the SHORT, MEDIUM, and LONG durations are retrieved |
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* from the chip during initialization with a call to tpm_get_timeouts. |
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*/ |
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static const u8 tpm1_ordinal_duration[TPM_MAX_ORDINAL] = { |
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TPM_UNDEFINED, /* 0 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 5 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 10 */ |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_LONG, |
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TPM_LONG, |
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TPM_MEDIUM, /* 15 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_LONG, |
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TPM_SHORT, /* 20 */ |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_SHORT, /* 25 */ |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_MEDIUM, /* 30 */ |
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TPM_LONG, |
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TPM_MEDIUM, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, /* 35 */ |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_MEDIUM, /* 40 */ |
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TPM_LONG, |
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TPM_MEDIUM, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, /* 45 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_LONG, |
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TPM_MEDIUM, /* 50 */ |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 55 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_MEDIUM, /* 60 */ |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_MEDIUM, /* 65 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 70 */ |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 75 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_LONG, /* 80 */ |
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TPM_UNDEFINED, |
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TPM_MEDIUM, |
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TPM_LONG, |
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TPM_SHORT, |
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TPM_UNDEFINED, /* 85 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 90 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, /* 95 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_MEDIUM, /* 100 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 105 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 110 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, /* 115 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_LONG, /* 120 */ |
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TPM_LONG, |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_SHORT, |
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TPM_SHORT, /* 125 */ |
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TPM_SHORT, |
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TPM_LONG, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, /* 130 */ |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_UNDEFINED, /* 135 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 140 */ |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 145 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 150 */ |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, /* 155 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 160 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 165 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_LONG, /* 170 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 175 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_MEDIUM, /* 180 */ |
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TPM_SHORT, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_MEDIUM, /* 185 */ |
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TPM_SHORT, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 190 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 195 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 200 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, |
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TPM_SHORT, /* 205 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_MEDIUM, /* 210 */ |
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TPM_UNDEFINED, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_MEDIUM, |
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TPM_UNDEFINED, /* 215 */ |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, |
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TPM_SHORT, /* 220 */ |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_SHORT, |
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TPM_UNDEFINED, /* 225 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 230 */ |
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TPM_LONG, |
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TPM_MEDIUM, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, /* 235 */ |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_UNDEFINED, |
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TPM_SHORT, /* 240 */ |
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TPM_UNDEFINED, |
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TPM_MEDIUM, |
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}; |
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|
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/** |
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* tpm1_calc_ordinal_duration() - calculate the maximum command duration |
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* @chip: TPM chip to use. |
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* @ordinal: TPM command ordinal. |
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* |
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* The function returns the maximum amount of time the chip could take |
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* to return the result for a particular ordinal in jiffies. |
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* |
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* Return: A maximal duration time for an ordinal in jiffies. |
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*/ |
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unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) |
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{ |
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int duration_idx = TPM_UNDEFINED; |
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int duration = 0; |
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|
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/* |
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* We only have a duration table for protected commands, where the upper |
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* 16 bits are 0. For the few other ordinals the fallback will be used. |
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*/ |
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if (ordinal < TPM_MAX_ORDINAL) |
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duration_idx = tpm1_ordinal_duration[ordinal]; |
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if (duration_idx != TPM_UNDEFINED) |
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duration = chip->duration[duration_idx]; |
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if (duration <= 0) |
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return 2 * 60 * HZ; |
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else |
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return duration; |
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} |
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#define TPM_ORD_STARTUP 153 |
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#define TPM_ST_CLEAR 1 |
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/** |
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* tpm1_startup() - turn on the TPM |
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* @chip: TPM chip to use |
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* |
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* Normally the firmware should start the TPM. This function is provided as a |
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* workaround if this does not happen. A legal case for this could be for |
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* example when a TPM emulator is used. |
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* |
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* Return: same as tpm_transmit_cmd() |
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*/ |
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static int tpm1_startup(struct tpm_chip *chip) |
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{ |
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struct tpm_buf buf; |
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int rc; |
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dev_info(&chip->dev, "starting up the TPM manually\n"); |
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP); |
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if (rc < 0) |
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return rc; |
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tpm_buf_append_u16(&buf, TPM_ST_CLEAR); |
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rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to start the TPM"); |
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tpm_buf_destroy(&buf); |
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return rc; |
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} |
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int tpm1_get_timeouts(struct tpm_chip *chip) |
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{ |
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cap_t cap; |
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unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4]; |
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unsigned long durations[3]; |
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ssize_t rc; |
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL, |
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sizeof(cap.timeout)); |
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if (rc == TPM_ERR_INVALID_POSTINIT) { |
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if (tpm1_startup(chip)) |
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return rc; |
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, |
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"attempting to determine the timeouts", |
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sizeof(cap.timeout)); |
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} |
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if (rc) { |
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dev_err(&chip->dev, "A TPM error (%zd) occurred attempting to determine the timeouts\n", |
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rc); |
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return rc; |
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} |
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timeout_old[0] = jiffies_to_usecs(chip->timeout_a); |
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timeout_old[1] = jiffies_to_usecs(chip->timeout_b); |
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timeout_old[2] = jiffies_to_usecs(chip->timeout_c); |
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timeout_old[3] = jiffies_to_usecs(chip->timeout_d); |
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timeout_chip[0] = be32_to_cpu(cap.timeout.a); |
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timeout_chip[1] = be32_to_cpu(cap.timeout.b); |
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timeout_chip[2] = be32_to_cpu(cap.timeout.c); |
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timeout_chip[3] = be32_to_cpu(cap.timeout.d); |
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memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff)); |
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|
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/* |
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* Provide ability for vendor overrides of timeout values in case |
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* of misreporting. |
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*/ |
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if (chip->ops->update_timeouts) |
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chip->ops->update_timeouts(chip, timeout_eff); |
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if (!chip->timeout_adjusted) { |
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/* Restore default if chip reported 0 */ |
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unsigned int i; |
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for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) { |
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if (timeout_eff[i]) |
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continue; |
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timeout_eff[i] = timeout_old[i]; |
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chip->timeout_adjusted = true; |
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} |
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if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) { |
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/* timeouts in msec rather usec */ |
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for (i = 0; i != ARRAY_SIZE(timeout_eff); i++) |
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timeout_eff[i] *= 1000; |
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chip->timeout_adjusted = true; |
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} |
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} |
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|
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/* Report adjusted timeouts */ |
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if (chip->timeout_adjusted) { |
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dev_info(&chip->dev, HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n", |
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timeout_chip[0], timeout_eff[0], |
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timeout_chip[1], timeout_eff[1], |
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timeout_chip[2], timeout_eff[2], |
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timeout_chip[3], timeout_eff[3]); |
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} |
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chip->timeout_a = usecs_to_jiffies(timeout_eff[0]); |
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chip->timeout_b = usecs_to_jiffies(timeout_eff[1]); |
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chip->timeout_c = usecs_to_jiffies(timeout_eff[2]); |
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chip->timeout_d = usecs_to_jiffies(timeout_eff[3]); |
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rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap, |
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"attempting to determine the durations", |
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sizeof(cap.duration)); |
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if (rc) |
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return rc; |
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chip->duration[TPM_SHORT] = |
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short)); |
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chip->duration[TPM_MEDIUM] = |
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium)); |
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chip->duration[TPM_LONG] = |
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usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long)); |
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chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */ |
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/* |
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* Provide the ability for vendor overrides of duration values in case |
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* of misreporting. |
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*/ |
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if (chip->ops->update_durations) |
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chip->ops->update_durations(chip, durations); |
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if (chip->duration_adjusted) { |
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dev_info(&chip->dev, HW_ERR "Adjusting reported durations."); |
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chip->duration[TPM_SHORT] = durations[0]; |
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chip->duration[TPM_MEDIUM] = durations[1]; |
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chip->duration[TPM_LONG] = durations[2]; |
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} |
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|
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/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above |
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* value wrong and apparently reports msecs rather than usecs. So we |
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* fix up the resulting too-small TPM_SHORT value to make things work. |
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* We also scale the TPM_MEDIUM and -_LONG values by 1000. |
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*/ |
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if (chip->duration[TPM_SHORT] < (HZ / 100)) { |
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chip->duration[TPM_SHORT] = HZ; |
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chip->duration[TPM_MEDIUM] *= 1000; |
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chip->duration[TPM_LONG] *= 1000; |
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chip->duration_adjusted = true; |
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dev_info(&chip->dev, "Adjusting TPM timeout parameters."); |
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} |
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chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS; |
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return 0; |
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} |
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#define TPM_ORD_PCR_EXTEND 20 |
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int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash, |
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const char *log_msg) |
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{ |
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struct tpm_buf buf; |
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int rc; |
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND); |
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if (rc) |
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return rc; |
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tpm_buf_append_u32(&buf, pcr_idx); |
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tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE); |
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rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, log_msg); |
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tpm_buf_destroy(&buf); |
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return rc; |
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} |
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|
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#define TPM_ORD_GET_CAP 101 |
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ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, |
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const char *desc, size_t min_cap_length) |
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{ |
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struct tpm_buf buf; |
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int rc; |
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|
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP); |
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if (rc) |
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return rc; |
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|
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if (subcap_id == TPM_CAP_VERSION_1_1 || |
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subcap_id == TPM_CAP_VERSION_1_2) { |
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tpm_buf_append_u32(&buf, subcap_id); |
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tpm_buf_append_u32(&buf, 0); |
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} else { |
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if (subcap_id == TPM_CAP_FLAG_PERM || |
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subcap_id == TPM_CAP_FLAG_VOL) |
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tpm_buf_append_u32(&buf, TPM_CAP_FLAG); |
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else |
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tpm_buf_append_u32(&buf, TPM_CAP_PROP); |
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|
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tpm_buf_append_u32(&buf, 4); |
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tpm_buf_append_u32(&buf, subcap_id); |
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} |
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rc = tpm_transmit_cmd(chip, &buf, min_cap_length, desc); |
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if (!rc) |
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*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4]; |
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tpm_buf_destroy(&buf); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(tpm1_getcap); |
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|
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#define TPM_ORD_GET_RANDOM 70 |
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struct tpm1_get_random_out { |
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__be32 rng_data_len; |
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u8 rng_data[TPM_MAX_RNG_DATA]; |
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} __packed; |
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|
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/** |
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* tpm1_get_random() - get random bytes from the TPM's RNG |
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* @chip: a &struct tpm_chip instance |
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* @dest: destination buffer for the random bytes |
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* @max: the maximum number of bytes to write to @dest |
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* |
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* Return: |
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* * number of bytes read |
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* * -errno (positive TPM return codes are masked to -EIO) |
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*/ |
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int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max) |
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{ |
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struct tpm1_get_random_out *out; |
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u32 num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA); |
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struct tpm_buf buf; |
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u32 total = 0; |
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int retries = 5; |
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u32 recd; |
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int rc; |
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|
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rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM); |
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if (rc) |
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return rc; |
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do { |
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tpm_buf_append_u32(&buf, num_bytes); |
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|
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rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len), |
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"attempting get random"); |
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if (rc) { |
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if (rc > 0) |
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rc = -EIO; |
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goto out; |
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} |
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|
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out = (struct tpm1_get_random_out *)&buf.data[TPM_HEADER_SIZE]; |
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|
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recd = be32_to_cpu(out->rng_data_len); |
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if (recd > num_bytes) { |
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rc = -EFAULT; |
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goto out; |
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} |
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|
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if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + |
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sizeof(out->rng_data_len) + recd) { |
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rc = -EFAULT; |
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goto out; |
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} |
|
memcpy(dest, out->rng_data, recd); |
|
|
|
dest += recd; |
|
total += recd; |
|
num_bytes -= recd; |
|
|
|
tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM); |
|
} while (retries-- && total < max); |
|
|
|
rc = total ? (int)total : -EIO; |
|
out: |
|
tpm_buf_destroy(&buf); |
|
return rc; |
|
} |
|
|
|
#define TPM_ORD_PCRREAD 21 |
|
int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf) |
|
{ |
|
struct tpm_buf buf; |
|
int rc; |
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCRREAD); |
|
if (rc) |
|
return rc; |
|
|
|
tpm_buf_append_u32(&buf, pcr_idx); |
|
|
|
rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, |
|
"attempting to read a pcr value"); |
|
if (rc) |
|
goto out; |
|
|
|
if (tpm_buf_length(&buf) < TPM_DIGEST_SIZE) { |
|
rc = -EFAULT; |
|
goto out; |
|
} |
|
|
|
memcpy(res_buf, &buf.data[TPM_HEADER_SIZE], TPM_DIGEST_SIZE); |
|
|
|
out: |
|
tpm_buf_destroy(&buf); |
|
return rc; |
|
} |
|
|
|
#define TPM_ORD_CONTINUE_SELFTEST 83 |
|
/** |
|
* tpm1_continue_selftest() - run TPM's selftest |
|
* @chip: TPM chip to use |
|
* |
|
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing |
|
* a TPM error code. |
|
*/ |
|
static int tpm1_continue_selftest(struct tpm_chip *chip) |
|
{ |
|
struct tpm_buf buf; |
|
int rc; |
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_CONTINUE_SELFTEST); |
|
if (rc) |
|
return rc; |
|
|
|
rc = tpm_transmit_cmd(chip, &buf, 0, "continue selftest"); |
|
tpm_buf_destroy(&buf); |
|
return rc; |
|
} |
|
|
|
/** |
|
* tpm1_do_selftest - have the TPM continue its selftest and wait until it |
|
* can receive further commands |
|
* @chip: TPM chip to use |
|
* |
|
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing |
|
* a TPM error code. |
|
*/ |
|
int tpm1_do_selftest(struct tpm_chip *chip) |
|
{ |
|
int rc; |
|
unsigned int loops; |
|
unsigned int delay_msec = 100; |
|
unsigned long duration; |
|
u8 dummy[TPM_DIGEST_SIZE]; |
|
|
|
duration = tpm1_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST); |
|
|
|
loops = jiffies_to_msecs(duration) / delay_msec; |
|
|
|
rc = tpm1_continue_selftest(chip); |
|
if (rc == TPM_ERR_INVALID_POSTINIT) { |
|
chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; |
|
dev_info(&chip->dev, "TPM not ready (%d)\n", rc); |
|
} |
|
/* This may fail if there was no TPM driver during a suspend/resume |
|
* cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST) |
|
*/ |
|
if (rc) |
|
return rc; |
|
|
|
do { |
|
/* Attempt to read a PCR value */ |
|
rc = tpm1_pcr_read(chip, 0, dummy); |
|
|
|
/* Some buggy TPMs will not respond to tpm_tis_ready() for |
|
* around 300ms while the self test is ongoing, keep trying |
|
* until the self test duration expires. |
|
*/ |
|
if (rc == -ETIME) { |
|
dev_info(&chip->dev, HW_ERR "TPM command timed out during continue self test"); |
|
tpm_msleep(delay_msec); |
|
continue; |
|
} |
|
|
|
if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) { |
|
dev_info(&chip->dev, "TPM is disabled/deactivated (0x%X)\n", |
|
rc); |
|
/* TPM is disabled and/or deactivated; driver can |
|
* proceed and TPM does handle commands for |
|
* suspend/resume correctly |
|
*/ |
|
return 0; |
|
} |
|
if (rc != TPM_WARN_DOING_SELFTEST) |
|
return rc; |
|
tpm_msleep(delay_msec); |
|
} while (--loops > 0); |
|
|
|
return rc; |
|
} |
|
EXPORT_SYMBOL_GPL(tpm1_do_selftest); |
|
|
|
/** |
|
* tpm1_auto_startup - Perform the standard automatic TPM initialization |
|
* sequence |
|
* @chip: TPM chip to use |
|
* |
|
* Returns 0 on success, < 0 in case of fatal error. |
|
*/ |
|
int tpm1_auto_startup(struct tpm_chip *chip) |
|
{ |
|
int rc; |
|
|
|
rc = tpm1_get_timeouts(chip); |
|
if (rc) |
|
goto out; |
|
rc = tpm1_do_selftest(chip); |
|
if (rc) { |
|
dev_err(&chip->dev, "TPM self test failed\n"); |
|
goto out; |
|
} |
|
|
|
return rc; |
|
out: |
|
if (rc > 0) |
|
rc = -ENODEV; |
|
return rc; |
|
} |
|
|
|
#define TPM_ORD_SAVESTATE 152 |
|
|
|
/** |
|
* tpm1_pm_suspend() - pm suspend handler |
|
* @chip: TPM chip to use. |
|
* @tpm_suspend_pcr: flush pcr for buggy TPM chips. |
|
* |
|
* The functions saves the TPM state to be restored on resume. |
|
* |
|
* Return: |
|
* * 0 on success, |
|
* * < 0 on error. |
|
*/ |
|
int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr) |
|
{ |
|
u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; |
|
struct tpm_buf buf; |
|
unsigned int try; |
|
int rc; |
|
|
|
|
|
/* for buggy tpm, flush pcrs with extend to selected dummy */ |
|
if (tpm_suspend_pcr) |
|
rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, |
|
"extending dummy pcr before suspend"); |
|
|
|
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); |
|
if (rc) |
|
return rc; |
|
/* now do the actual savestate */ |
|
for (try = 0; try < TPM_RETRY; try++) { |
|
rc = tpm_transmit_cmd(chip, &buf, 0, NULL); |
|
/* |
|
* If the TPM indicates that it is too busy to respond to |
|
* this command then retry before giving up. It can take |
|
* several seconds for this TPM to be ready. |
|
* |
|
* This can happen if the TPM has already been sent the |
|
* SaveState command before the driver has loaded. TCG 1.2 |
|
* specification states that any communication after SaveState |
|
* may cause the TPM to invalidate previously saved state. |
|
*/ |
|
if (rc != TPM_WARN_RETRY) |
|
break; |
|
tpm_msleep(TPM_TIMEOUT_RETRY); |
|
|
|
tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); |
|
} |
|
|
|
if (rc) |
|
dev_err(&chip->dev, "Error (%d) sending savestate before suspend\n", |
|
rc); |
|
else if (try > 0) |
|
dev_warn(&chip->dev, "TPM savestate took %dms\n", |
|
try * TPM_TIMEOUT_RETRY); |
|
|
|
tpm_buf_destroy(&buf); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* tpm1_get_pcr_allocation() - initialize the allocated bank |
|
* @chip: TPM chip to use. |
|
* |
|
* The function initializes the SHA1 allocated bank to extend PCR |
|
* |
|
* Return: |
|
* * 0 on success, |
|
* * < 0 on error. |
|
*/ |
|
int tpm1_get_pcr_allocation(struct tpm_chip *chip) |
|
{ |
|
chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks), |
|
GFP_KERNEL); |
|
if (!chip->allocated_banks) |
|
return -ENOMEM; |
|
|
|
chip->allocated_banks[0].alg_id = TPM_ALG_SHA1; |
|
chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1]; |
|
chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1; |
|
chip->nr_allocated_banks = 1; |
|
|
|
return 0; |
|
}
|
|
|