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Physical TPMs use Open Firmware Device Tree bindings that are similar to the IBM Power virtual TPM to support event log. However, these properties store the values in different endianness for Physical and Virtual TPM. This patch fixes the endianness issue by doing appropriate conversion based on Physical or Virtual TPM. Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Kenneth Goldman <kgold@linux.vnet.ibm.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* Copyright 2012 IBM Corporation
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*
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* Author: Ashley Lai <ashleydlai@gmail.com>
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* Nayna Jain <nayna@linux.vnet.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Read the event log created by the firmware on PPC64
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "tpm.h"
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#include "tpm_eventlog.h"
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int tpm_read_log_of(struct tpm_chip *chip)
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{
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struct device_node *np;
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const u32 *sizep;
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const u64 *basep;
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struct tpm_bios_log *log;
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u32 size;
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u64 base;
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log = &chip->log;
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if (chip->dev.parent && chip->dev.parent->of_node)
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np = chip->dev.parent->of_node;
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else
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return -ENODEV;
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sizep = of_get_property(np, "linux,sml-size", NULL);
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basep = of_get_property(np, "linux,sml-base", NULL);
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if (sizep == NULL && basep == NULL)
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return -ENODEV;
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if (sizep == NULL || basep == NULL)
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return -EIO;
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/*
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* For both vtpm/tpm, firmware has log addr and log size in big
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* endian format. But in case of vtpm, there is a method called
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* sml-handover which is run during kernel init even before
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* device tree is setup. This sml-handover function takes care
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* of endianness and writes to sml-base and sml-size in little
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* endian format. For this reason, vtpm doesn't need conversion
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* but physical tpm needs the conversion.
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*/
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if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0) {
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size = be32_to_cpup(sizep);
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base = be64_to_cpup(basep);
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} else {
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size = *sizep;
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base = *basep;
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}
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if (size == 0) {
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dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);
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return -EIO;
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}
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log->bios_event_log = kmalloc(size, GFP_KERNEL);
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if (!log->bios_event_log)
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return -ENOMEM;
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log->bios_event_log_end = log->bios_event_log + size;
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memcpy(log->bios_event_log, __va(base), size);
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return 0;
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}
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