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tpm/ppi: Possibly show command parameter if TPM PPI 1.3 is used

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TPM PPI 1.3 introduces an additional optional command parameter
that may be needed for some commands. Display the parameter if the
command requires such a parameter. Only command 23 needs one.

The PPI request file will show output like this then:

   # echo "23 16" > request
   # cat request
   23 16

   # echo "5" > request
   # cat request
   5

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: David Safford <david.safford@ge.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Stefan Berger 2019-01-17 12:41:34 -05:00 committed by Jarkko Sakkinen
parent 9d4023ed4d
commit 8b60c79bcc
1 changed files with 29 additions and 2 deletions
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31
drivers/char/tpm/tpm_ppi.c
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@ -21,6 +21,7 @@
#include "tpm.h"
#define TPM_PPI_REVISION_ID_1 1
#define TPM_PPI_REVISION_ID_2 2
#define TPM_PPI_FN_VERSION 1
#define TPM_PPI_FN_SUBREQ 2
#define TPM_PPI_FN_GETREQ 3
@ -36,6 +37,11 @@ static const guid_t tpm_ppi_guid =
GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);
static bool tpm_ppi_req_has_parameter(u64 req)
{
return req == 23;
}
static inline union acpi_object *
tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
union acpi_object *argv4, u64 rev)
@ -59,9 +65,14 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
ssize_t size = -EINVAL;
union acpi_object *obj;
struct tpm_chip *chip = to_tpm_chip(dev);
u64 rev = TPM_PPI_REVISION_ID_2;
u64 req;
if (strcmp(chip->ppi_version, "1.2") < 0)
rev = TPM_PPI_REVISION_ID_1;
obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
ACPI_TYPE_PACKAGE, NULL, TPM_PPI_REVISION_ID_1);
ACPI_TYPE_PACKAGE, NULL, rev);
if (!obj)
return -ENXIO;
@ -71,7 +82,23 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
* error. The second is pending TPM operation requested by the OS, 0
* means none and >0 means operation value.
*/
if (obj->package.count == 2 &&
if (obj->package.count == 3 &&
obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
obj->package.elements[1].type == ACPI_TYPE_INTEGER &&
obj->package.elements[2].type == ACPI_TYPE_INTEGER) {
if (obj->package.elements[0].integer.value)
size = -EFAULT;
else {
req = obj->package.elements[1].integer.value;
if (tpm_ppi_req_has_parameter(req))
size = scnprintf(buf, PAGE_SIZE,
"%llu %llu\n", req,
obj->package.elements[2].integer.value);
else
size = scnprintf(buf, PAGE_SIZE,
"%llu\n", req);
}
} else if (obj->package.count == 2 &&
obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
if (obj->package.elements[0].integer.value)