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77 lines
2.1 KiB
77 lines
2.1 KiB
// 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 <[email protected]> |
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* Nayna Jain <[email protected]> |
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* |
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* Maintained by: <[email protected]> |
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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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