// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/tpm_eventlog.h>
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#include "../tpm.h"
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#include "common.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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if (of_property_read_bool(np, "powered-while-suspended"))
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chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
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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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of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {
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size = be32_to_cpup((__force __be32 *)sizep);
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base = be64_to_cpup((__force __be64 *)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 = kmemdup(__va(base), 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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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
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return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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}
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