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tpm/ppi: Enable submission of optional command parameter for PPI 1.3

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This patch enables a user to specify the additional optional command
parameter by writing it into the request file:

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

For backwards compatibility:

If only 1 parameter is given then we assume this is the operation request
number.

   # 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 12:41:35 -05:00 committed by Jarkko Sakkinen
parent 8b60c79bcc
commit 50a81b60bf
1 changed files with 16 additions and 6 deletions
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22
drivers/char/tpm/tpm_ppi.c
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@ -120,9 +120,10 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
u32 req;
u64 ret;
int func = TPM_PPI_FN_SUBREQ;
union acpi_object *obj, tmp;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
union acpi_object *obj, tmp[2];
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(2, tmp);
struct tpm_chip *chip = to_tpm_chip(dev);
u64 rev = TPM_PPI_REVISION_ID_1;
/*
* the function to submit TPM operation request to pre-os environment
@ -139,20 +140,29 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
* string/package type. For PPI version 1.0 and 1.1, use buffer type
* for compatibility, and use package type since 1.2 according to spec.
*/
if (strcmp(chip->ppi_version, "1.2") < 0) {
if (strcmp(chip->ppi_version, "1.3") == 0) {
if (sscanf(buf, "%llu %llu", &tmp[0].integer.value,
&tmp[1].integer.value) != 2)
goto ppi12;
rev = TPM_PPI_REVISION_ID_2;
tmp[0].type = ACPI_TYPE_INTEGER;
tmp[1].type = ACPI_TYPE_INTEGER;
} else if (strcmp(chip->ppi_version, "1.2") < 0) {
if (sscanf(buf, "%d", &req) != 1)
return -EINVAL;
argv4.type = ACPI_TYPE_BUFFER;
argv4.buffer.length = sizeof(req);
argv4.buffer.pointer = (u8 *)&req;
} else {
tmp.type = ACPI_TYPE_INTEGER;
if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
ppi12:
argv4.package.count = 1;
tmp[0].type = ACPI_TYPE_INTEGER;
if (sscanf(buf, "%llu", &tmp[0].integer.value) != 1)
return -EINVAL;
}
obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
&argv4, TPM_PPI_REVISION_ID_1);
&argv4, rev);
if (!obj) {
return -ENXIO;
} else {