78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright 2012 IBM Corporation
|
||
|
|
*
|
||
|
|
* Author: Ashley Lai <ashleydlai@gmail.com>
|
||
|
|
* Nayna Jain <nayna@linux.vnet.ibm.com>
|
||
|
|
*
|
||
|
|
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
|
||
|
|
*
|
||
|
|
* Read the event log created by the firmware on PPC64
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/tpm_eventlog.h>
|
||
|
|
|
||
|
|
#include "../tpm.h"
|
||
|
|
#include "common.h"
|
||
|
|
|
||
|
|
int tpm_read_log_of(struct tpm_chip *chip)
|
||
|
|
{
|
||
|
|
struct device_node *np;
|
||
|
|
const u32 *sizep;
|
||
|
|
const u64 *basep;
|
||
|
|
struct tpm_bios_log *log;
|
||
|
|
u32 size;
|
||
|
|
u64 base;
|
||
|
|
|
||
|
|
log = &chip->log;
|
||
|
|
if (chip->dev.parent && chip->dev.parent->of_node)
|
||
|
|
np = chip->dev.parent->of_node;
|
||
|
|
else
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
if (of_property_read_bool(np, "powered-while-suspended"))
|
||
|
|
chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
|
||
|
|
|
||
|
|
sizep = of_get_property(np, "linux,sml-size", NULL);
|
||
|
|
basep = of_get_property(np, "linux,sml-base", NULL);
|
||
|
|
if (sizep == NULL && basep == NULL)
|
||
|
|
return -ENODEV;
|
||
|
|
if (sizep == NULL || basep == NULL)
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For both vtpm/tpm, firmware has log addr and log size in big
|
||
|
|
* endian format. But in case of vtpm, there is a method called
|
||
|
|
* sml-handover which is run during kernel init even before
|
||
|
|
* device tree is setup. This sml-handover function takes care
|
||
|
|
* of endianness and writes to sml-base and sml-size in little
|
||
|
|
* endian format. For this reason, vtpm doesn't need conversion
|
||
|
|
* but physical tpm needs the conversion.
|
||
|
|
*/
|
||
|
|
if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&
|
||
|
|
of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {
|
||
|
|
size = be32_to_cpup((__force __be32 *)sizep);
|
||
|
|
base = be64_to_cpup((__force __be64 *)basep);
|
||
|
|
} else {
|
||
|
|
size = *sizep;
|
||
|
|
base = *basep;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (size == 0) {
|
||
|
|
dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
log->bios_event_log = kmemdup(__va(base), size, GFP_KERNEL);
|
||
|
|
if (!log->bios_event_log)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
log->bios_event_log_end = log->bios_event_log + size;
|
||
|
|
|
||
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2)
|
||
|
|
return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
|
||
|
|
return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
|
||
|
|
}
|