Commit 1e2714bb authored by Eddie James's avatar Eddie James Committed by Jarkko Sakkinen
Browse files

tpm: Add reserved memory event log 



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: default avatarEddie James <eajames@linux.ibm.com>
[jarkko: removed spurious dev_info()'s from tpm_read_log_memory_region()]
Reviewed-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
[yang: return -ENOMEM when devm_memremap() fails]
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
parent 441b7152

drivers/char/tpm/eventlog/of.c

+31 −1
Original line number Diff line number Diff line
@@ -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;