0cf577a03f
The event log is an optional firmware feature, if the firmware does not support it then the securityfs files should not be created and no other notification given. - Uniformly return -ENODEV from the tpm_bios_log_setup cone if no event log is detected. - Check in ACPI if this node was discovered via ACPI. - Improve the check in OF to make sure there is a parent and to fail detection if the two log properties are not declared - Pass through all other error codes instead of filtering just some Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2005 IBM Corporation
|
|
*
|
|
* Authors:
|
|
* Seiji Munetoh <munetoh@jp.ibm.com>
|
|
* Stefan Berger <stefanb@us.ibm.com>
|
|
* Reiner Sailer <sailer@watson.ibm.com>
|
|
* Kylene Hall <kjhall@us.ibm.com>
|
|
* Nayna Jain <nayna@linux.vnet.ibm.com>
|
|
*
|
|
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
|
|
*
|
|
* Access to the event log extended by the TCG BIOS of PC platform
|
|
*
|
|
* 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/seq_file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/security.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include "tpm.h"
|
|
#include "tpm_eventlog.h"
|
|
|
|
struct acpi_tcpa {
|
|
struct acpi_table_header hdr;
|
|
u16 platform_class;
|
|
union {
|
|
struct client_hdr {
|
|
u32 log_max_len __packed;
|
|
u64 log_start_addr __packed;
|
|
} client;
|
|
struct server_hdr {
|
|
u16 reserved;
|
|
u64 log_max_len __packed;
|
|
u64 log_start_addr __packed;
|
|
} server;
|
|
};
|
|
};
|
|
|
|
/* read binary bios log */
|
|
int tpm_read_log_acpi(struct tpm_chip *chip)
|
|
{
|
|
struct acpi_tcpa *buff;
|
|
acpi_status status;
|
|
void __iomem *virt;
|
|
u64 len, start;
|
|
struct tpm_bios_log *log;
|
|
|
|
log = &chip->log;
|
|
|
|
/* Unfortuntely ACPI does not associate the event log with a specific
|
|
* TPM, like PPI. Thus all ACPI TPMs will read the same log.
|
|
*/
|
|
if (!chip->acpi_dev_handle)
|
|
return -ENODEV;
|
|
|
|
/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
|
|
status = acpi_get_table(ACPI_SIG_TCPA, 1,
|
|
(struct acpi_table_header **)&buff);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
switch(buff->platform_class) {
|
|
case BIOS_SERVER:
|
|
len = buff->server.log_max_len;
|
|
start = buff->server.log_start_addr;
|
|
break;
|
|
case BIOS_CLIENT:
|
|
default:
|
|
len = buff->client.log_max_len;
|
|
start = buff->client.log_start_addr;
|
|
break;
|
|
}
|
|
if (!len) {
|
|
dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
|
|
return -EIO;
|
|
}
|
|
|
|
/* malloc EventLog space */
|
|
log->bios_event_log = kmalloc(len, GFP_KERNEL);
|
|
if (!log->bios_event_log)
|
|
return -ENOMEM;
|
|
|
|
log->bios_event_log_end = log->bios_event_log + len;
|
|
|
|
virt = acpi_os_map_iomem(start, len);
|
|
if (!virt)
|
|
goto err;
|
|
|
|
memcpy_fromio(log->bios_event_log, virt, len);
|
|
|
|
acpi_os_unmap_iomem(virt, len);
|
|
return 0;
|
|
|
|
err:
|
|
kfree(log->bios_event_log);
|
|
log->bios_event_log = NULL;
|
|
return -EIO;
|
|
|
|
}
|