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tpm: Add reserved memory event log

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Some platforms may desire to pass the event log up to Linux in the
form of a reserved memory region. In particular, this is desirable
for embedded systems or baseboard management controllers (BMCs)
booting with U-Boot. IBM OpenBMC BMCs will be the first user.
Add support for the reserved memory in the TPM core to find the
region and map it.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
[jarkko: removed spurious dev_info()'s from tpm_read_log_memory_region()]
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
[yang: return -ENOMEM when devm_memremap() fails]
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Eddie James 2023-01-26 15:08:10 -06:00 committed by Jarkko Sakkinen
parent 441b715272
commit 1e2714bb83
1 changed files with 31 additions and 1 deletions
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32
drivers/char/tpm/eventlog/of.c
View File

@ -12,12 +12,42 @@
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_reserved_mem.h>
#include <linux/tpm_eventlog.h>
#include "../tpm.h"
#include "common.h"
static int tpm_read_log_memory_region(struct tpm_chip *chip)
{
struct device_node *node;
struct resource res;
int rc;
node = of_parse_phandle(chip->dev.parent->of_node, "memory-region", 0);
if (!node)
return -ENODEV;
rc = of_address_to_resource(node, 0, &res);
of_node_put(node);
if (rc)
return rc;
chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, resource_size(&res),
MEMREMAP_WB);
if (IS_ERR(chip->log.bios_event_log))
return -ENOMEM;
chip->log.bios_event_log_end = chip->log.bios_event_log + resource_size(&res);
return chip->flags & TPM_CHIP_FLAG_TPM2 ? EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 :
EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
}
int tpm_read_log_of(struct tpm_chip *chip)
{
struct device_node *np;
@ -39,7 +69,7 @@ int tpm_read_log_of(struct tpm_chip *chip)
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;
return tpm_read_log_memory_region(chip);
if (sizep == NULL || basep == NULL)
return -EIO;