Re: [PATCH] tpm: migrate tpm2_do_selftest() to use struct tpm_buf

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On 02/09/2018 06:48 PM, Jarkko Sakkinen wrote:
As part of an ongoing effort to encapsulate TPM commands to struct
tpm_buf instead of using clunky union of structs, migrated
tpm2_do_selft_test() to use struct tpm_buf.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
I wish this would be included as part of patch set that fixes the timing
issue.
  drivers/char/tpm/tpm2-cmd.c | 32 ++++++++++----------------------
  1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index c17e75348a99..a91a2c6f03a7 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -31,10 +31,6 @@ struct tpm2_startup_in {
  	__be16	startup_type;
  } __packed;

-struct tpm2_self_test_in {
-	u8	full_test;
-} __packed;
-
  struct tpm2_get_tpm_pt_in {
  	__be32	cap_id;
  	__be32	property_id;
@@ -60,7 +56,6 @@ struct tpm2_get_random_out {

  union tpm2_cmd_params {
  	struct	tpm2_startup_in		startup_in;
-	struct	tpm2_self_test_in	selftest_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;
@@ -823,16 +818,6 @@ unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
  }
  EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);

-#define TPM2_SELF_TEST_IN_SIZE \
-	(sizeof(struct tpm_input_header) + \
-	 sizeof(struct tpm2_self_test_in))
-
-static const struct tpm_input_header tpm2_selftest_header = {
-	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
-	.length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
-	.ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
-};
-
  /**
   * tpm2_do_selftest() - ensure that all self tests have passed
   *
@@ -851,18 +836,21 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
  	int rc;
  	unsigned int delay_msec = 10;
  	long duration;
-	struct tpm2_cmd cmd;
+	struct tpm_buf buf;

  	duration = jiffies_to_msecs(
  		tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST));

-	while (1) {
-		cmd.header.in = tpm2_selftest_header;
-		cmd.params.selftest_in.full_test = 0;
-
-		rc = tpm_transmit_cmd(chip, NULL, &cmd, TPM2_SELF_TEST_IN_SIZE,
-				      0, 0, "continue selftest");
+	for (;;) {
+		rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST);
+		if (rc)
+			return rc;

+		/* Perform tests in the background. */
+		tpm_buf_append_u8(&buf, 0);
+		rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
+				      "continue selftest");
+		tpm_buf_destroy(&buf);
  		if (rc != TPM2_RC_TESTING || delay_msec >= duration)
  			break;

Tested-By: Nayna Jain <nayna@xxxxxxxxxxxxxxxxxx>

Thanks & Regards,
     - Nayna




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