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Subject[PATCH] tpm: migrate tpm2_do_selftest() to use struct tpm_buf
Date
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@linux.intel.com>
---
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;

--
2.14.1
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