Commit 4d627e67 authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Jarkko Sakkinen
Browse files

tpm_tis: Do not fall back to a hardcoded address for TPM2 



If the ACPI tables do not declare a memory resource for the TPM2
then do not just fall back to the x86 default base address.

Also be stricter when checking the ancillary TPM2 ACPI data and error
out if any of this data is wrong rather than blindly assuming TPM1.

Fixes: 399235dc ("tpm, tpm_tis: fix tpm_tis ACPI detection issue with TPM 2.0")
Signed-off-by: default avatarJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: default avatarWilck, Martin <martin.wilck@ts.fujitsu.com>
Tested-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: default avatarPeter Huewe <peterhuewe@gmx.de>
parent ef7b81dc

drivers/char/tpm/tpm_tis.c

+18 −30
Original line number Diff line number Diff line
@@ -121,39 +121,11 @@ static inline int is_itpm(struct acpi_device *dev) 
{

	return has_hid(dev, "INTC0102");

}



static inline int is_fifo(struct acpi_device *dev)

{

	struct acpi_table_tpm2 *tbl;

	acpi_status st;



	/* TPM 1.2 FIFO */

	if (!has_hid(dev, "MSFT0101"))

		return 1;



	st = acpi_get_table(ACPI_SIG_TPM2, 1,

			    (struct acpi_table_header **) &tbl);

	if (ACPI_FAILURE(st)) {

		dev_err(&dev->dev, "failed to get TPM2 ACPI table\n");

		return 0;

	}



	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)

		return 0;



	/* TPM 2.0 FIFO */

	return 1;

}

#else

static inline int is_itpm(struct acpi_device *dev)

{

	return 0;

}



static inline int is_fifo(struct acpi_device *dev)

{

	return 1;

}

#endif



/* Before we attempt to access the TPM we must see that the valid bit is set.
@@ -979,11 +951,21 @@ static int tpm_check_resource(struct acpi_resource *ares, void *data) 


static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)

{

	struct acpi_table_tpm2 *tbl;

	acpi_status st;

	struct list_head resources;

	struct tpm_info tpm_info = tis_default_info;

	struct tpm_info tpm_info = {};

	int ret;



	if (!is_fifo(acpi_dev))

	st = acpi_get_table(ACPI_SIG_TPM2, 1,

			    (struct acpi_table_header **) &tbl);

	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {

		dev_err(&acpi_dev->dev,

			FW_BUG "failed to get TPM2 ACPI table\n");

		return -EINVAL;

	}



	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)

		return -ENODEV;



	INIT_LIST_HEAD(&resources);
@@ -995,6 +977,12 @@ static int tpm_tis_acpi_init(struct acpi_device *acpi_dev) 


	acpi_dev_free_resource_list(&resources);



	if (tpm_info.start == 0 && tpm_info.len == 0) {

		dev_err(&acpi_dev->dev,

			FW_BUG "TPM2 ACPI table does not define a memory resource\n");

		return -EINVAL;

	}



	if (is_itpm(acpi_dev))

		itpm = true;

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