From c82a330ceceda28304e37bab35128fa0c9c7f172 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Fri, 19 Oct 2018 21:22:57 +0300 Subject: [PATCH] tpm: factor out tpm 1.x pm suspend flow into tpm1-cmd.c Factor out TPM 1.x suspend flow from tpm-interface.c into a new function tpm1_pm_suspend() in tpm1-cmd.c Signed-off-by: Tomas Winkler Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 55 +++------------------------- drivers/char/tpm/tpm.h | 2 ++ drivers/char/tpm/tpm1-cmd.c | 61 ++++++++++++++++++++++++++++++++ 3 files changed, 68 insertions(+), 50 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 70b20b4c789a..25242190a941 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -585,15 +585,6 @@ int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen) } EXPORT_SYMBOL_GPL(tpm_send); -#define TPM_ORD_SAVESTATE 152 -#define SAVESTATE_RESULT_SIZE 10 - -static const struct tpm_input_header savestate_header = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .length = cpu_to_be32(10), - .ordinal = cpu_to_be32(TPM_ORD_SAVESTATE) -}; - /* * We are about to suspend. Save the TPM state * so that it can be restored. @@ -601,54 +592,18 @@ static const struct tpm_input_header savestate_header = { int tpm_pm_suspend(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); - struct tpm_cmd_t cmd; - int rc, try; - - u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; + int rc = 0; - if (chip == NULL) + if (!chip) return -ENODEV; if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED) return 0; - if (chip->flags & TPM_CHIP_FLAG_TPM2) { + if (chip->flags & TPM_CHIP_FLAG_TPM2) tpm2_shutdown(chip, TPM2_SU_STATE); - return 0; - } - - /* for buggy tpm, flush pcrs with extend to selected dummy */ - if (tpm_suspend_pcr) - rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, - "extending dummy pcr before suspend"); - - /* now do the actual savestate */ - for (try = 0; try < TPM_RETRY; try++) { - cmd.header.in = savestate_header; - rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE, - 0, 0, NULL); - - /* - * If the TPM indicates that it is too busy to respond to - * this command then retry before giving up. It can take - * several seconds for this TPM to be ready. - * - * This can happen if the TPM has already been sent the - * SaveState command before the driver has loaded. TCG 1.2 - * specification states that any communication after SaveState - * may cause the TPM to invalidate previously saved state. - */ - if (rc != TPM_WARN_RETRY) - break; - tpm_msleep(TPM_TIMEOUT_RETRY); - } - - if (rc) - dev_err(&chip->dev, - "Error (%d) sending savestate before suspend\n", rc); - else if (try > 0) - dev_warn(&chip->dev, "TPM savestate took %dms\n", - try * TPM_TIMEOUT_RETRY); + else + rc = tpm1_pm_suspend(chip, tpm_suspend_pcr); return rc; } diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index f284a98a9455..754f7bcb15fa 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -542,6 +542,8 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space, const char *desc); int tpm_startup(struct tpm_chip *chip); int tpm_get_timeouts(struct tpm_chip *); + +int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr); int tpm1_auto_startup(struct tpm_chip *chip); int tpm1_do_selftest(struct tpm_chip *chip); int tpm1_get_timeouts(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c index a69a02366c32..3bd9f1fa77ce 100644 --- a/drivers/char/tpm/tpm1-cmd.c +++ b/drivers/char/tpm/tpm1-cmd.c @@ -666,3 +666,64 @@ int tpm1_auto_startup(struct tpm_chip *chip) rc = -ENODEV; return rc; } + +#define TPM_ORD_SAVESTATE 152 +#define SAVESTATE_RESULT_SIZE 10 +static const struct tpm_input_header savestate_header = { + .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), + .length = cpu_to_be32(10), + .ordinal = cpu_to_be32(TPM_ORD_SAVESTATE) +}; + +/** + * tpm1_pm_suspend() - pm suspend handler + * @chip: TPM chip to use. + * @tpm_suspend_pcr: flush pcr for buggy TPM chips. + * + * The functions saves the TPM state to be restored on resume. + * + * Return: + * * 0 on success, + * * < 0 on error. + */ +int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr) +{ + u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; + struct tpm_cmd_t cmd; + int rc, try; + + /* for buggy tpm, flush pcrs with extend to selected dummy */ + if (tpm_suspend_pcr) + rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, + "extending dummy pcr before suspend"); + + /* now do the actual savestate */ + for (try = 0; try < TPM_RETRY; try++) { + cmd.header.in = savestate_header; + rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE, + 0, 0, NULL); + + /* + * If the TPM indicates that it is too busy to respond to + * this command then retry before giving up. It can take + * several seconds for this TPM to be ready. + * + * This can happen if the TPM has already been sent the + * SaveState command before the driver has loaded. TCG 1.2 + * specification states that any communication after SaveState + * may cause the TPM to invalidate previously saved state. + */ + if (rc != TPM_WARN_RETRY) + break; + tpm_msleep(TPM_TIMEOUT_RETRY); + } + + if (rc) + dev_err(&chip->dev, "Error (%d) sending savestate before suspend\n", + rc); + else if (try > 0) + dev_warn(&chip->dev, "TPM savestate took %dms\n", + try * TPM_TIMEOUT_RETRY); + + return rc; +} -- 2.45.2