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author | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2018-03-26 15:14:04 +0300 |
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committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2018-07-28 17:03:11 +0300 |
commit | 94e266ba1fa344631dca424b7c83370c8c22983d (patch) | |
tree | bfd3b2ec8b7aa94bf5c70048c4c7a67b08f9c9bd /drivers/char/tpm | |
parent | cc26c6ef58c781473090ce45e17e4b5ff7bd8b2a (diff) | |
download | linux-94e266ba1fa344631dca424b7c83370c8c22983d.tar.xz |
tpm: migrate tpm2_probe() to use struct tpm_buf
In order to make struct tpm_buf the first class object for constructing TPM
commands, migrate tpm2_probe() to use it.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Jay Freyensee <why2jjj.linux@gmail.com>
Reviewed-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Tested-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Diffstat (limited to 'drivers/char/tpm')
-rw-r--r-- | drivers/char/tpm/tpm2-cmd.c | 40 |
1 files changed, 23 insertions, 17 deletions
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 026fec4e1800..b82e2b141754 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -846,31 +846,37 @@ static int tpm2_do_selftest(struct tpm_chip *chip) } /** - * tpm2_probe() - probe TPM 2.0 - * @chip: TPM chip to use + * tpm2_probe() - probe for the TPM 2.0 protocol + * @chip: a &tpm_chip instance * - * Return: < 0 error and 0 on success. + * Send an idempotent TPM 2.0 command and see whether there is TPM2 chip in the + * other end based on the response tag. The flag TPM_CHIP_FLAG_TPM2 is set by + * this function if this is the case. * - * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on - * the reply tag. + * Return: + * 0 on success, + * -errno otherwise */ int tpm2_probe(struct tpm_chip *chip) { - struct tpm2_cmd cmd; + struct tpm_output_header *out; + struct tpm_buf buf; int rc; - cmd.header.in = tpm2_get_tpm_pt_header; - cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); - cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100); - cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); - - rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0, NULL); - if (rc < 0) + rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY); + if (rc) return rc; - - if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS) - chip->flags |= TPM_CHIP_FLAG_TPM2; - + tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES); + tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS); + tpm_buf_append_u32(&buf, 1); + rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0, NULL); + /* We ignore TPM return codes on purpose. */ + if (rc >= 0) { + out = (struct tpm_output_header *)buf.data; + if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS) + chip->flags |= TPM_CHIP_FLAG_TPM2; + } + tpm_buf_destroy(&buf); return 0; } EXPORT_SYMBOL_GPL(tpm2_probe); |