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| author | Stefan Berger <stefanb@linux.ibm.com> | 2019-01-17 18:41:35 +0100 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2019-02-13 08:48:53 +0100 |
| commit | 50a81b60bfe075a0023670ff86558abd02536799 (patch) | |
| tree | 2df7d84a00bebee64fd245021f593256d6fcc105 /drivers/char/tpm | |
| parent | tpm/ppi: Possibly show command parameter if TPM PPI 1.3 is used (diff) | |
| download | linux-50a81b60bfe075a0023670ff86558abd02536799.tar.xz linux-50a81b60bfe075a0023670ff86558abd02536799.zip | |
tpm/ppi: Enable submission of optional command parameter for PPI 1.3
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>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/tpm_ppi.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c index 942a2f79e9da..75e7a856177c 100644 --- a/drivers/char/tpm/tpm_ppi.c +++ b/drivers/char/tpm/tpm_ppi.c @@ -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 { |