Am Donnerstag, 4. Dezember 2014, 06:55:17 schrieb Jarkko Sakkinen: > tpm_crb is a driver for TPM 2.0 Command Response Buffer (CRB) Interface > as defined in PC Client Platform TPM Profile (PTP) Specification. > > Only polling and single locality is supported as these are the limitations > of the available hardware, Platform Trust Techonlogy (PTT) in Haswell > CPUs. > > The driver always applies CRB with ACPI start because PTT reports using > only ACPI start as start method but as a result of my testing it requires > also CRB start. > > Signed-off-by: Jarkko Sakkinen <[email protected]> > --- > drivers/char/tpm/Kconfig | 9 ++ > drivers/char/tpm/Makefile | 1 + > drivers/char/tpm/tpm_crb.c | 356 > +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 366 > insertions(+) > create mode 100644 drivers/char/tpm/tpm_crb.c > > diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig > index 3d0873b..9d4e375 100644 > --- a/drivers/char/tpm/Kconfig > +++ b/drivers/char/tpm/Kconfig > @@ -122,4 +122,13 @@ config TCG_XEN > To compile this driver as a module, choose M here; the module > will be called xen-tpmfront. > > +config TCG_CRB > + tristate "TPM 2.0 CRB Interface" > + depends on X86 && 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 > + from within Linux. To compile this driver as a module, choose > + M here; the module will be called tpm_crb. > + > endif # TCG_TPM > diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile > index 88848ed..990cf18 100644 > --- a/drivers/char/tpm/Makefile > +++ b/drivers/char/tpm/Makefile > @@ -22,3 +22,4 @@ obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o > obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o > obj-$(CONFIG_TCG_TIS_I2C_ST33) += tpm_i2c_stm_st33.o > obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o > +obj-$(CONFIG_TCG_CRB) += tpm_crb.o > diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c > new file mode 100644 > index 0000000..eb78f93 > --- /dev/null > +++ b/drivers/char/tpm/tpm_crb.c > @@ -0,0 +1,356 @@ > +/* > + * Copyright (C) 2014 Intel Corporation > + * > + * Authors: > + * Jarkko Sakkinen <[email protected]> > + * > + * Maintained by: <[email protected]> > + * > + * This device driver implements the TPM interface as defined in > + * the TCG CRB 2.0 TPM specification. > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License > + * as published by the Free Software Foundation; version 2 > + * of the License. > + */ > + > +#include <linux/acpi.h> > +#include <linux/highmem.h> > +#include <linux/rculist.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include "tpm.h" > + > +#define ACPI_SIG_TPM2 "TPM2" > + > +static const u8 CRB_ACPI_START_UUID[] = { > + /* 0000 */ 0xAB, 0x6C, 0xBF, 0x6B, 0x63, 0x54, 0x14, 0x47, > + /* 0008 */ 0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4 > +}; > + > +enum crb_defaults { > + CRB_ACPI_START_REVISION_ID = 1, > + CRB_ACPI_START_INDEX = 1, > +}; > + > +enum crb_start_method { > + CRB_SM_ACPI_START = 2, > + CRB_SM_CRB = 7, > + CRB_SM_CRB_WITH_ACPI_START = 8, > +}; > + > +struct acpi_tpm2 { > + struct acpi_table_header hdr; > + u16 platform_class; > + u16 reserved; > + u64 control_area_pa; > + u32 start_method; > +} __packed; > + > +enum crb_ca_request { > + CRB_CA_REQ_GO_IDLE = BIT(0), > + CRB_CA_REQ_CMD_READY = BIT(1), > +}; > + > +enum crb_ca_status { > + CRB_CA_STS_ERROR = BIT(0), > + CRB_CA_STS_TPM_IDLE = BIT(1), > +}; > + > +enum crb_start { > + CRB_START_INVOKE = BIT(0), > +}; > + > +enum crb_cancel { > + CRB_CANCEL_INVOKE = BIT(0), > +}; > + > +struct crb_control_area { > + u32 req; > + u32 sts; > + u32 cancel; > + u32 start; > + u32 int_enable; > + u32 int_sts; > + u32 cmd_size; > + u64 cmd_pa; > + u32 rsp_size; > + u64 rsp_pa; > +} __packed; > + > +enum crb_status { > + CRB_STS_COMPLETE = BIT(0), > +}; > + > +enum crb_flags { > + CRB_FL_ACPI_START = BIT(0), > + CRB_FL_CRB_START = BIT(1), > +}; > + > +struct crb_priv { > + unsigned int flags; > + struct crb_control_area *cca; > + u8 *cmd; > + u8 *rsp; > +}; > + > +#ifdef CONFIG_PM_SLEEP > +int crb_suspend(struct device *dev) > +{ > + return 0; > +} > + > +static int crb_resume(struct device *dev) > +{ > + struct tpm_chip *chip = dev_get_drvdata(dev); > + > + (void) tpm2_do_selftest(chip); ^^^^^ ??????? What's this? > + > + return 0; > +} > +#endif
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