[PATCH v3 0/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[PATCH v3 0/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[Jiandi An]

TCG ACPI Specification Family "1.2" and "2.0" Version 1.2 Revision 8
introduces a new start method (type 11) for ARM64, along with platform
specific parameters for this new start method.  This new start method
invokes a Secure Monitor Call to request the firmware to execute or
cancel a TPM 2.0 command.

v3 Change Log:
- Added start method specific parameter offset define
- Moved tpm_crb_smc definition to tpm_crb.c
- Removed platform_params union from acpi_table_tpm2
- Removed clutter on length calculation of acpi_table_tpm2
  caused by changing size of acpi_table_tpm2

Jiandi An (2):
  ACPICA: Update TPM2 ACPI table
  tpm/tpm_crb: Enable TPM CRB interface for ARM64

 drivers/char/tpm/Kconfig   |  2 +-
 drivers/char/tpm/tpm_crb.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
 include/acpi/actbl2.h      |  3 +++
 3 files changed, 66 insertions(+), 3 deletions(-)

-- 
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.


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[PATCH v3 1/2] ACPICA: Update TPM2 ACPI table

[Jiandi An]

TCG ACPI Specification Family "1.2" and "2.0" Version 1.2
Revision 8 introduces new start method for ARM SMC.

- Add new start method (type 11) for ARM SMC
- Add start method specific parameters for ARM SMC start method

Signed-off-by: Jiandi An <anjiandi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 include/acpi/actbl2.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 7aee9fb..2b4af07 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -1294,6 +1294,9 @@ struct acpi_table_tpm2 {
 #define ACPI_TPM2_MEMORY_MAPPED                     6
 #define ACPI_TPM2_COMMAND_BUFFER                    7
 #define ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD  8
+#define ACPI_TPM2_COMMAND_BUFFER_WITH_SMC          11
+
+#define ACPI_TPM2_START_METHOD_PARAMETER_OFFSET    52
 
 /*******************************************************************************
  *
-- 
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.


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[PATCH v3 2/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[Jiandi An]

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 <anjiandi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/char/tpm/Kconfig   |  2 +-
 drivers/char/tpm/tpm_crb.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 63 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 cb6fb13..f8a5470 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"
@@ -73,6 +76,7 @@ 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 {
@@ -82,6 +86,15 @@ 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;
 };
 
 /**
@@ -101,7 +114,8 @@ 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->cca->req);
@@ -129,7 +143,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
 {
 	ktime_t stop, start;
 
-	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->cca->req);
@@ -202,6 +217,33 @@ 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 inline 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 inline 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);
@@ -229,6 +271,11 @@ 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->cca->start);
+		rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
+	}
+
 	return rc;
 }
 
@@ -409,6 +456,7 @@ 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;
@@ -441,6 +489,18 @@ 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 = (struct tpm2_crb_smc *) (((u8 *) 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.


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Re: [PATCH v3 2/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[Jarkko Sakkinen]

On Fri, Mar 17, 2017 at 06:43:13PM -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 <anjiandi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Does not compile.

/Jarkko

> ---
>  drivers/char/tpm/Kconfig   |  2 +-
>  drivers/char/tpm/tpm_crb.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 63 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 cb6fb13..f8a5470 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"
> @@ -73,6 +76,7 @@ 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 {
> @@ -82,6 +86,15 @@ 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;
>  };
>  
>  /**
> @@ -101,7 +114,8 @@ 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->cca->req);
> @@ -129,7 +143,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
>  {
>  	ktime_t stop, start;
>  
> -	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->cca->req);
> @@ -202,6 +217,33 @@ 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 inline 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 inline 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);
> @@ -229,6 +271,11 @@ 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->cca->start);
> +		rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
> +	}
> +
>  	return rc;
>  }
>  
> @@ -409,6 +456,7 @@ 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;
> @@ -441,6 +489,18 @@ 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 = (struct tpm2_crb_smc *) (((u8 *) 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.
> 

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Re: [PATCH v3 2/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[Jiandi An]

On 03/22/17 01:12, Jarkko Sakkinen wrote:
> On Fri, Mar 17, 2017 at 06:43:13PM -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 <anjiandi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>
> Does not compile.
>
> /Jarkko

I appologize for this.  I see control area structure has
recently changed.  I'll ensure to rebase to your latest in v4.

- Jiandi

>
>> ---
>>   drivers/char/tpm/Kconfig   |  2 +-
>>   drivers/char/tpm/tpm_crb.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
>>   2 files changed, 63 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 cb6fb13..f8a5470 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"
>> @@ -73,6 +76,7 @@ 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 {
>> @@ -82,6 +86,15 @@ 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;
>>   };
>>
>>   /**
>> @@ -101,7 +114,8 @@ 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->cca->req);
>> @@ -129,7 +143,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
>>   {
>>   	ktime_t stop, start;
>>
>> -	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->cca->req);
>> @@ -202,6 +217,33 @@ 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 inline 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 inline 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);
>> @@ -229,6 +271,11 @@ 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->cca->start);
>> +		rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
>> +	}
>> +
>>   	return rc;
>>   }
>>
>> @@ -409,6 +456,7 @@ 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;
>> @@ -441,6 +489,18 @@ 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 = (struct tpm2_crb_smc *) (((u8 *) 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.

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Re: [PATCH v3 2/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

[Jarkko Sakkinen]

On Thu, Mar 23, 2017 at 06:28:47PM -0500, Jiandi An wrote:
> On 03/22/17 01:12, Jarkko Sakkinen wrote:
> > On Fri, Mar 17, 2017 at 06:43:13PM -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 <anjiandi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> > 
> > Does not compile.
> > 
> > /Jarkko
> 
> I appologize for this.  I see control area structure has
> recently changed.  I'll ensure to rebase to your latest in v4.
> 
> - Jiandi

No need for apologies, just remember to always rebase just before
you git send-email.

/Jarkko

> 
> > 
> > > ---
> > >   drivers/char/tpm/Kconfig   |  2 +-
> > >   drivers/char/tpm/tpm_crb.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--
> > >   2 files changed, 63 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 cb6fb13..f8a5470 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"
> > > @@ -73,6 +76,7 @@ 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 {
> > > @@ -82,6 +86,15 @@ 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;
> > >   };
> > > 
> > >   /**
> > > @@ -101,7 +114,8 @@ 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->cca->req);
> > > @@ -129,7 +143,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
> > >   {
> > >   	ktime_t stop, start;
> > > 
> > > -	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->cca->req);
> > > @@ -202,6 +217,33 @@ 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 inline 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 inline 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);
> > > @@ -229,6 +271,11 @@ 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->cca->start);
> > > +		rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
> > > +	}
> > > +
> > >   	return rc;
> > >   }
> > > 
> > > @@ -409,6 +456,7 @@ 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;
> > > @@ -441,6 +489,18 @@ 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 = (struct tpm2_crb_smc *) (((u8 *) 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.

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