Release 4.18 drivers/char/tpm/eventlog/of.c
/*
* 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
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#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) {
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nayna Jain | 97 | 36.33% | 5 | 38.46% |
| Ashley Lai | 90 | 33.71% | 1 | 7.69% |
| Jason Gunthorpe | 35 | 13.11% | 1 | 7.69% |
| Thiébaud Weksteen | 22 | 8.24% | 2 | 15.38% |
| Enric Balletbò i Serra | 15 | 5.62% | 1 | 7.69% |
| Ji-Hun Kim | 6 | 2.25% | 1 | 7.69% |
| Colin Ian King | 1 | 0.37% | 1 | 7.69% |
| Hon Ching (Vicky) Lo | 1 | 0.37% | 1 | 7.69% |
| Total | 267 | 100.00% | 13 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ashley Lai | 100 | 35.34% | 1 | 6.25% |
| Nayna Jain | 98 | 34.63% | 5 | 31.25% |
| Jason Gunthorpe | 35 | 12.37% | 1 | 6.25% |
| Thiébaud Weksteen | 27 | 9.54% | 5 | 31.25% |
| Enric Balletbò i Serra | 15 | 5.30% | 1 | 6.25% |
| Ji-Hun Kim | 6 | 2.12% | 1 | 6.25% |
| Colin Ian King | 1 | 0.35% | 1 | 6.25% |
| Hon Ching (Vicky) Lo | 1 | 0.35% | 1 | 6.25% |
| Total | 283 | 100.00% | 16 | 100.00% |
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