diff options
| author |   Jason Gunthorpe <jgunthorpe@obsidianresearch.com> | 2012-11-21 13:54:33 -0700 |
|---|---|---|
| committer |   Kent Yoder <key@linux.vnet.ibm.com> | 2013-02-05 09:38:22 -0600 |
| commit | c584af1926b7626ef3bdab3354382cb2bd434d36 (patch) | |
| tree | 1d614a9e70d9a5195fa80c89f0027899c5af9531 /drivers/char/tpm/tpm.c | |
| parent | char/tpm: simplify duration calculation and eliminate smatch warning. (diff) | |
| download | linux-dev-c584af1926b7626ef3bdab3354382cb2bd434d36.tar.xz linux-dev-c584af1926b7626ef3bdab3354382cb2bd434d36.zip | |
TPM: Issue TPM_STARTUP at driver load if the TPM has not been started
The TPM will respond to TPM_GET_CAP with TPM_ERR_INVALID_POSTINIT if
TPM_STARTUP has not been issued. Detect this and automatically
issue TPM_STARTUP.
This is for embedded applications where the kernel is the first thing
to touch the TPM.
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Peter Huewe <peter.huewe@infineon.com>
Reviewed-by: Peter Huewe <peter.huewe@infineon.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char/tpm/tpm.c')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 0a08af031a57..023dfbaffe73 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -451,7 +451,7 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, return -EFAULT; err = be32_to_cpu(cmd->header.out.return_code); - if (err != 0) + if (err != 0 && desc) dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); return err; @@ -511,6 +511,25 @@ void tpm_gen_interrupt(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_gen_interrupt); +#define TPM_ORD_STARTUP cpu_to_be32(153) +#define TPM_ST_CLEAR cpu_to_be16(1) +#define TPM_ST_STATE cpu_to_be16(2) +#define TPM_ST_DEACTIVATED cpu_to_be16(3) +static const struct tpm_input_header tpm_startup_header = { + .tag = TPM_TAG_RQU_COMMAND, + .length = cpu_to_be32(12), + .ordinal = TPM_ORD_STARTUP +}; + +static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) +{ + struct tpm_cmd_t start_cmd; + start_cmd.header.in = tpm_startup_header; + start_cmd.params.startup_in.startup_type = startup_type; + return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, + "attempting to start the TPM"); +} + int tpm_get_timeouts(struct tpm_chip *chip) { struct tpm_cmd_t tpm_cmd; @@ -524,11 +543,28 @@ int tpm_get_timeouts(struct tpm_chip *chip) tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL); - rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, - "attempting to determine the timeouts"); - if (rc) + if (rc == TPM_ERR_INVALID_POSTINIT) { + /* The TPM is not started, we are the first to talk to it. + Execute a startup command. */ + dev_info(chip->dev, "Issuing TPM_STARTUP"); + if (tpm_startup(chip, TPM_ST_CLEAR)) + return rc; + + tpm_cmd.header.in = tpm_getcap_header; + tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; + tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); + tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, + NULL); + } + if (rc) { + dev_err(chip->dev, + "A TPM error (%zd) occurred attempting to determine the timeouts\n", + rc); goto duration; + } if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || be32_to_cpu(tpm_cmd.header.out.length) |