linux-kernel - [PATCH RFC 3/4] tpm: export tpm2_flush_context

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Message-Id: <20170102132213.22880-4-jarkko.sakkinen@linux.intel.com>
Date:   Mon,  2 Jan 2017 15:22:09 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     tpmdd-devel@...ts.sourceforge.net
Cc:     linux-security-module@...r.kernel.org,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH RFC 3/4] tpm: export tpm2_flush_context_cmd

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 drivers/char/tpm/tpm.h      |  2 ++
 drivers/char/tpm/tpm2-cmd.c | 47 ++++++++++++++++++++++-----------------------
 2 files changed, 25 insertions(+), 24 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index ed21c2c..fb02b57 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -533,6 +533,8 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
+void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
+			    unsigned int flags);
 int tpm2_seal_trusted(struct tpm_chip *chip,
 		      struct trusted_key_payload *payload,
 		      struct trusted_key_options *options);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index fa928c7..311dc8e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -401,6 +401,29 @@ static const struct tpm_input_header tpm2_get_tpm_pt_header = {
 };
 
 /**
+ * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
+ * @chip: TPM chip to use
+ * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
+ *
+ * Return: same as with tpm_transmit_cmd
+ */
+void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
+			    unsigned int flags)
+{
+	int rc;
+
+	tpm_buf_init(&chip->tr_buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
+	tpm_buf_append_u32(&chip->tr_buf, handle);
+
+	rc = tpm_transmit_cmd(chip, chip->tr_buf.data, TPM_BUFSIZE, flags,
+			      "flushing context");
+	if (rc)
+		dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
+			 rc);
+}
+
+/**
  * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
  *
  * @buf: an allocated tpm_buf instance
@@ -589,30 +612,6 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 }
 
 /**
- * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
- *
- * @chip: TPM chip to use
- * @handle: the key data in clear and encrypted form
- * @flags: tpm transmit flags
- *
- * Return: Same as with tpm_transmit_cmd.
- */
-static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
-				   unsigned int flags)
-{
-	int rc;
-
-	tpm_buf_init(&chip->tr_buf, TPM2_ST_NO_SESSIONS, TPM2_CC_FLUSH_CONTEXT);
-	tpm_buf_append_u32(&chip->tr_buf, handle);
-
-	rc = tpm_transmit_cmd(chip, &chip->tr_buf, TPM_BUFSIZE, flags,
-			      "flushing context");
-	if (rc)
-		dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
-			 rc);
-}
-
-/**
  * tpm2_unseal_cmd() - execute a TPM2_Unload command
  *
  * @chip: TPM chip to use
-- 
2.9.3