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authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2018-06-05 22:22:58 +0300
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2018-07-28 17:03:11 +0300
commitcc26c6ef58c781473090ce45e17e4b5ff7bd8b2a (patch)
treee81d6110ac6e5d7c12f63db1c2f03cb76a6ac20d /drivers/char
parent87ea58433208d17295e200d56be5e2a4fe4ce7d6 (diff)
tpm: migrate tpm2_shutdown() to use struct tpm_buf
In order to make struct tpm_buf the first class object for constructing TPM commands, migrated tpm2_shutdown() to use it. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.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')
-rw-r--r--drivers/char/tpm/tpm2-cmd.c47
1 files changed, 15 insertions, 32 deletions
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index d31b09099216..026fec4e1800 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -27,10 +27,6 @@ enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
};
-struct tpm2_startup_in {
- __be16 startup_type;
-} __packed;
-
struct tpm2_get_tpm_pt_in {
__be32 cap_id;
__be32 property_id;
@@ -55,7 +51,6 @@ struct tpm2_get_random_out {
} __packed;
union tpm2_cmd_params {
- struct tpm2_startup_in startup_in;
struct tpm2_get_tpm_pt_in get_tpm_pt_in;
struct tpm2_get_tpm_pt_out get_tpm_pt_out;
struct tpm2_get_random_in getrandom_in;
@@ -762,40 +757,28 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
}
EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
-#define TPM2_SHUTDOWN_IN_SIZE \
- (sizeof(struct tpm_input_header) + \
- sizeof(struct tpm2_startup_in))
-
-static const struct tpm_input_header tpm2_shutdown_header = {
- .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
- .length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
- .ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
-};
-
/**
- * tpm2_shutdown() - send shutdown command to the TPM chip
+ * tpm2_shutdown() - send a TPM shutdown command
*
- * @chip: TPM chip to use.
- * @shutdown_type: shutdown type. The value is either
- * TPM_SU_CLEAR or TPM_SU_STATE.
+ * Sends a TPM shutdown command. The shutdown command is used in call
+ * sites where the system is going down. If it fails, there is not much
+ * that can be done except print an error message.
+ *
+ * @chip: a &tpm_chip instance
+ * @shutdown_type: TPM_SU_CLEAR or TPM_SU_STATE.
*/
void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
{
- struct tpm2_cmd cmd;
+ struct tpm_buf buf;
int rc;
- cmd.header.in = tpm2_shutdown_header;
- cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
-
- rc = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd), 0, 0,
- "stopping the TPM");
-
- /* In places where shutdown command is sent there's no much we can do
- * except print the error code on a system failure.
- */
- if (rc < 0 && rc != -EPIPE)
- dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
- rc);
+ rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SHUTDOWN);
+ if (rc)
+ return;
+ tpm_buf_append_u16(&buf, shutdown_type);
+ tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
+ "stopping the TPM");
+ tpm_buf_destroy(&buf);
}
/*