On 03/24/17 12:45, Jarkko Sakkinen wrote: > On Fri, Mar 24, 2017 at 04:55:45AM -0500, Jiandi An wrote: >> This enables TPM Command Response Buffer interface driver for >> ARM64 and implements an ARM specific TPM CRB start method that >> invokes a Secure Monitor Call (SMC) to request the TrustZone >> Firmware to execute or cancel a TPM 2.0 command. >> >> In ARM, TrustZone security extensions enable a secure software >> environment with Secure Monitor mode. A Secure Monitor Call >> (SMC) is used to enter the Secure Monitor mode and perform a >> Secure Monitor service to communicate with TrustZone firmware >> which has control over the TPM hardware. >> >> Signed-off-by: Jiandi An <[email protected]> > > LGTM > > Reviewed-by: Jarkko Sakkinen <[email protected]> > > How this can be tested / do you know anyone who could test your > change? I can test that it doesn't break x86. > > /Jarkko
Thanks for the review Jarkko. I'm including Shanker Donthineni ([email protected]) that has ARM64 platform that could test on the ARM64 side. - Jiandi > >> --- >> drivers/char/tpm/Kconfig | 2 +- >> drivers/char/tpm/tpm_crb.c | 67 >> ++++++++++++++++++++++++++++++++++++++++++++-- >> 2 files changed, 66 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig >> index d520ac5..a3035220 100644 >> --- a/drivers/char/tpm/Kconfig >> +++ b/drivers/char/tpm/Kconfig >> @@ -136,7 +136,7 @@ config TCG_XEN >> >> config TCG_CRB >> tristate "TPM 2.0 CRB Interface" >> - depends on X86 && ACPI >> + depends on ACPI >> ---help--- >> If you have a TPM security chip that is compliant with the >> TCG CRB 2.0 TPM specification say Yes and it will be accessible >> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c >> index 9f31609..a9773fa 100644 >> --- a/drivers/char/tpm/tpm_crb.c >> +++ b/drivers/char/tpm/tpm_crb.c >> @@ -20,6 +20,9 @@ >> #include <linux/rculist.h> >> #include <linux/module.h> >> #include <linux/pm_runtime.h> >> +#ifdef CONFIG_ARM64 >> +#include <linux/arm-smccc.h> >> +#endif >> #include "tpm.h" >> >> #define ACPI_SIG_TPM2 "TPM2" >> @@ -83,6 +86,7 @@ enum crb_status { >> enum crb_flags { >> CRB_FL_ACPI_START = BIT(0), >> CRB_FL_CRB_START = BIT(1), >> + CRB_FL_CRB_SMC_START = BIT(2), >> }; >> >> struct crb_priv { >> @@ -93,6 +97,15 @@ struct crb_priv { >> u8 __iomem *cmd; >> u8 __iomem *rsp; >> u32 cmd_size; >> + u32 smc_func_id; >> +}; >> + >> +struct tpm2_crb_smc { >> + u32 interrupt; >> + u8 interrupt_flags; >> + u8 op_flags; >> + u16 reserved2; >> + u32 smc_func_id; >> }; >> >> /** >> @@ -112,7 +125,8 @@ struct crb_priv { >> */ >> static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv >> *priv) >> { >> - if (priv->flags & CRB_FL_ACPI_START) >> + if ((priv->flags & CRB_FL_ACPI_START) || >> + (priv->flags & CRB_FL_CRB_SMC_START)) >> return 0; >> >> iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req); >> @@ -157,7 +171,8 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 >> mask, u32 value, >> static int __maybe_unused crb_cmd_ready(struct device *dev, >> struct crb_priv *priv) >> { >> - if (priv->flags & CRB_FL_ACPI_START) >> + if ((priv->flags & CRB_FL_ACPI_START) || >> + (priv->flags & CRB_FL_CRB_SMC_START)) >> return 0; >> >> iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req); >> @@ -223,6 +238,34 @@ static int crb_do_acpi_start(struct tpm_chip *chip) >> return rc; >> } >> >> +#ifdef CONFIG_ARM64 >> +/* >> + * This is a TPM Command Response Buffer start method that invokes a >> + * Secure Monitor Call to requrest the firmware to execute or cancel >> + * a TPM 2.0 command. >> + */ >> +static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) >> +{ >> + struct arm_smccc_res res; >> + >> + arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res); >> + if (res.a0 != 0) { >> + dev_err(dev, >> + FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n", >> + res.a0); >> + return -EIO; >> + } >> + >> + return 0; >> +} >> +#else >> +static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) >> +{ >> + dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n"); >> + return -EINVAL; >> +} >> +#endif >> + >> static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len) >> { >> struct crb_priv *priv = dev_get_drvdata(&chip->dev); >> @@ -250,6 +293,11 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, >> size_t len) >> if (priv->flags & CRB_FL_ACPI_START) >> rc = crb_do_acpi_start(chip); >> >> + if (priv->flags & CRB_FL_CRB_SMC_START) { >> + iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); >> + rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id); >> + } >> + >> return rc; >> } >> >> @@ -442,6 +490,7 @@ static int crb_acpi_add(struct acpi_device *device) >> struct crb_priv *priv; >> struct tpm_chip *chip; >> struct device *dev = &device->dev; >> + struct tpm2_crb_smc *crb_smc; >> acpi_status status; >> u32 sm; >> int rc; >> @@ -474,6 +523,20 @@ static int crb_acpi_add(struct acpi_device *device) >> sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) >> priv->flags |= CRB_FL_ACPI_START; >> >> + if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_SMC) { >> + if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) { >> + dev_err(dev, >> + FW_BUG "TPM2 ACPI table has wrong size %u for >> start method type %d\n", >> + buf->header.length, >> + ACPI_TPM2_COMMAND_BUFFER_WITH_SMC); >> + return -EINVAL; >> + } >> + crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, >> + ACPI_TPM2_START_METHOD_PARAMETER_OFFSET); >> + priv->smc_func_id = crb_smc->smc_func_id; >> + priv->flags |= CRB_FL_CRB_SMC_START; >> + } >> + >> rc = crb_map_io(device, priv, buf); >> if (rc) >> return rc; >> -- >> Jiandi An >> Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm >> Technologies, Inc. >> Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux >> Foundation Collaborative Project. >> -- Jiandi An Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ tpmdd-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
