diff mbox

[v4,2/4] tpm: migrate tpm2_probe() to use struct tpm_buf

Message ID 20180326121406.14548-3-jarkko.sakkinen@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jarkko Sakkinen March 26, 2018, 12:14 p.m. UTC
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>
---
 drivers/char/tpm/tpm2-cmd.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

Comments

Nayna May 18, 2018, 6:31 a.m. UTC | #1
On 03/26/2018 05:44 PM, Jarkko Sakkinen wrote:
> 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>


Thanks & Regards,
     - Nayna

> ---
>   drivers/char/tpm/tpm2-cmd.c | 37 +++++++++++++++++++++----------------
>   1 file changed, 21 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 7665661d9230..7bffd0fd1dca 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -844,30 +844,35 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
>
>   /**
>    * tpm2_probe() - probe TPM 2.0
> - * @chip: TPM chip to use
> + * @chip: a TPM chip to probe
>    *
> - * Return: < 0 error and 0 on success.
> + * Return: 0 on success,
> + *         -errno otherwise
>    *
> - * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
> - * the reply tag.
> + * 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 if
> + * this is the case.
>    */
>   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);

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Jerry Snitselaar May 18, 2018, 10:35 p.m. UTC | #2
On Mon Mar 26 18, Jarkko Sakkinen wrote:
>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: Jerry Snitselaar <jsnitsel@redhat.com>

>---
> drivers/char/tpm/tpm2-cmd.c | 37 +++++++++++++++++++++----------------
> 1 file changed, 21 insertions(+), 16 deletions(-)
>
>diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>index 7665661d9230..7bffd0fd1dca 100644
>--- a/drivers/char/tpm/tpm2-cmd.c
>+++ b/drivers/char/tpm/tpm2-cmd.c
>@@ -844,30 +844,35 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
>
> /**
>  * tpm2_probe() - probe TPM 2.0
>- * @chip: TPM chip to use
>+ * @chip: a TPM chip to probe
>  *
>- * Return: < 0 error and 0 on success.
>+ * Return: 0 on success,
>+ *         -errno otherwise
>  *
>- * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
>- * the reply tag.
>+ * 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 if
>+ * this is the case.
>  */
> 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);
>-- 
>2.15.1
>
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diff mbox

Patch

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 7665661d9230..7bffd0fd1dca 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -844,30 +844,35 @@  static int tpm2_do_selftest(struct tpm_chip *chip)
 
 /**
  * tpm2_probe() - probe TPM 2.0
- * @chip: TPM chip to use
+ * @chip: a TPM chip to probe
  *
- * Return: < 0 error and 0 on success.
+ * Return: 0 on success,
+ *         -errno otherwise
  *
- * Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
- * the reply tag.
+ * 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 if
+ * this is the case.
  */
 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);