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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>
This commit is contained in:
Jarkko Sakkinen 2018-03-26 15:14:04 +03:00
parent cc26c6ef58
commit 94e266ba1f
1 changed files with 23 additions and 17 deletions
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40
drivers/char/tpm/tpm2-cmd.c
View File

@ -846,31 +846,37 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
} }
/** /**
* tpm2_probe() - probe TPM 2.0 * tpm2_probe() - probe for the TPM 2.0 protocol
* @chip: TPM chip to use * @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 * Return:
* the reply tag. * 0 on success,
* -errno otherwise
*/ */
int tpm2_probe(struct tpm_chip *chip) int tpm2_probe(struct tpm_chip *chip)
{ {
struct tpm2_cmd cmd; struct tpm_output_header *out;
struct tpm_buf buf;
int rc; int rc;
cmd.header.in = tpm2_get_tpm_pt_header; rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES); if (rc)
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)
return rc; return rc;
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS) tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
chip->flags |= TPM_CHIP_FLAG_TPM2; 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; return 0;
} }
EXPORT_SYMBOL_GPL(tpm2_probe); EXPORT_SYMBOL_GPL(tpm2_probe);