Prepare and commit TPM space before and after calling tpm_transmit() instead of doing that inside tpm_transmit(). After this change we can remove TPM_TRANSMIT_NESTED flag from tpm2_prepare_space() and tpm2_commit_space() and replace it with TPM_TRANSMIT_UNLOCKED.
Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com> --- drivers/char/tpm/tpm-dev-common.c | 30 ++++++++++++++++++++++++++---- drivers/char/tpm/tpm-interface.c | 29 +++-------------------------- drivers/char/tpm/tpm2-space.c | 14 +++++++------- 3 files changed, 36 insertions(+), 37 deletions(-) diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c index cbb0ee30b511..40c1cb09ebd2 100644 --- a/drivers/char/tpm/tpm-dev-common.c +++ b/drivers/char/tpm/tpm-dev-common.c @@ -30,13 +30,35 @@ static DEFINE_MUTEX(tpm_dev_wq_lock); static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space, u8 *buf, size_t bufsiz) { - ssize_t ret; + struct tpm_header *header = (void *)buf; + ssize_t ret, len; mutex_lock(&chip->tpm_mutex); - ret = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED); - mutex_unlock(&chip->tpm_mutex); + ret = tpm2_prepare_space(chip, space, buf, bufsiz); + /* If the command is not implemented by the TPM, synthesize a + * response with a TPM2_RC_COMMAND_CODE return for user-space. + */ + if (ret == -EOPNOTSUPP) { + header->length = cpu_to_be32(sizeof(*header)); + header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); + header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE | + TSS2_RESMGR_TPM_RC_LAYER); + ret = sizeof(*header); + } + if (ret) + goto out_lock; - return ret; + len = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED); + if (len < 0) + ret = len; + + if (ret) + tpm2_flush_space(chip); + else + ret = tpm2_commit_space(chip, space, buf, &len); +out_lock: + mutex_unlock(&chip->tpm_mutex); + return ret ? ret : len; } static void tpm_dev_async_work(struct work_struct *work) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index a6ffd0960ae5..7bec03e46043 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -147,27 +147,12 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, return -E2BIG; } - rc = tpm2_prepare_space(chip, space, buf, bufsiz); - /* - * If the command is not implemented by the TPM, synthesize a - * response with a TPM2_RC_COMMAND_CODE return for user-space. - */ - if (rc == -EOPNOTSUPP) { - header->length = cpu_to_be32(sizeof(*header)); - header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); - header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE | - TSS2_RESMGR_TPM_RC_LAYER); - return sizeof(*header); - } - if (rc) - return rc; - rc = chip->ops->send(chip, buf, count); if (rc < 0) { if (rc != -EPIPE) dev_err(&chip->dev, "%s: tpm_send: error %d\n", __func__, rc); - goto out_space; + return rc; } if (chip->flags & TPM_CHIP_FLAG_IRQ) @@ -182,8 +167,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, if (chip->ops->req_canceled(chip, status)) { dev_err(&chip->dev, "Operation Canceled\n"); - rc = -ECANCELED; - goto out_space; + return -ECANCELED; } tpm_msleep(TPM_TIMEOUT_POLL); @@ -192,8 +176,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, chip->ops->cancel(chip); dev_err(&chip->dev, "Operation Timed out\n"); - rc = -ETIME; - goto out_space; + return -ETIME; out_recv: len = chip->ops->recv(chip, buf, bufsiz); @@ -203,12 +186,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length)) rc = -EFAULT; -out_space: - if (rc) - tpm2_flush_space(chip); - else - rc = tpm2_commit_space(chip, space, buf, &len); - return rc ? rc : len; } diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index f35ac941c3a4..9c009db15f88 100644 --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -39,7 +39,7 @@ static void tpm2_flush_sessions(struct tpm_chip *chip, struct tpm_space *space) for (i = 0; i < ARRAY_SIZE(space->session_tbl); i++) { if (space->session_tbl[i]) tpm2_flush_context_cmd(chip, space->session_tbl[i], - TPM_TRANSMIT_NESTED); + TPM_TRANSMIT_UNLOCKED); } } @@ -84,7 +84,7 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf, tpm_buf_append(&tbuf, &buf[*offset], body_size); rc = tpm_transmit_cmd(chip, NULL, &tbuf, 4, - TPM_TRANSMIT_NESTED, NULL); + TPM_TRANSMIT_UNLOCKED, NULL); if (rc < 0) { dev_warn(&chip->dev, "%s: failed with a system error %d\n", __func__, rc); @@ -133,7 +133,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf, tpm_buf_append_u32(&tbuf, handle); rc = tpm_transmit_cmd(chip, NULL, &tbuf, 0, - TPM_TRANSMIT_NESTED, NULL); + TPM_TRANSMIT_UNLOCKED, NULL); if (rc < 0) { dev_warn(&chip->dev, "%s: failed with a system error %d\n", __func__, rc); @@ -170,7 +170,7 @@ void tpm2_flush_space(struct tpm_chip *chip) for (i = 0; i < ARRAY_SIZE(space->context_tbl); i++) if (space->context_tbl[i] && ~space->context_tbl[i]) tpm2_flush_context_cmd(chip, space->context_tbl[i], - TPM_TRANSMIT_NESTED); + TPM_TRANSMIT_UNLOCKED); tpm2_flush_sessions(chip, space); } @@ -267,7 +267,7 @@ static int tpm2_map_command(struct tpm_chip *chip, u32 cc, u8 *cmd) static int tpm_validate_command(struct tpm_chip *chip, struct tpm_space *space, const u8 *cmd, size_t len) { - const struct tpm_input_header *header = (const void *)cmd; + const struct tpm_header *header = (const void *)cmd; int i; u32 cc; u32 attrs; @@ -419,7 +419,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp, return 0; out_no_slots: - tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_NESTED); + tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_UNLOCKED); dev_warn(&chip->dev, "%s: out of slots for 0x%08X\n", __func__, phandle); return -ENOMEM; @@ -507,7 +507,7 @@ static int tpm2_save_space(struct tpm_chip *chip) return rc; tpm2_flush_context_cmd(chip, space->context_tbl[i], - TPM_TRANSMIT_NESTED); + TPM_TRANSMIT_UNLOCKED); space->context_tbl[i] = ~0; } -- 2.19.1