[tpmdd-devel,v2,2/2] tpm/tpm_crb: Enable TPM CRB interface for ARM64

Submitted by Jiandi An on March 15, 2017, 1:32 a.m.

Details

Message ID 1489541553-2066-2-git-send-email-anjiandi@codeaurora.org
State New
Headers show

Commit Message

Jiandi An March 15, 2017, 1:32 a.m.
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.

An 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@codeaurora.org>
---
v2
- Squash commit of inline SMC function with commit of
  tpm_crb driver change for TPM CRB ARM64 enablement
- Replace WARN to dev_err FW_BUG in tpm_crb_smc_start()
- Fix dev_err to indicate FW_BUG for wrong size of TPM2
  ACPI table with SMC start method
- Make tpm_crb driver only dependent on ACPI in Kconfig

 drivers/char/tpm/Kconfig   |  2 +-
 drivers/char/tpm/tpm_crb.c | 53 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 52 insertions(+), 3 deletions(-)

Comments

Jarkko Sakkinen March 15, 2017, 4:03 p.m.
On Tue, Mar 14, 2017 at 08:32:33PM -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.
> 
> An 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@codeaurora.org>
> ---
> v2
> - Squash commit of inline SMC function with commit of
>   tpm_crb driver change for TPM CRB ARM64 enablement
> - Replace WARN to dev_err FW_BUG in tpm_crb_smc_start()
> - Fix dev_err to indicate FW_BUG for wrong size of TPM2
>   ACPI table with SMC start method
> - Make tpm_crb driver only dependent on ACPI in Kconfig

The change log should be in the cover letter not scattered in the
patches if you send more than one patch.

> 
>  drivers/char/tpm/Kconfig   |  2 +-
>  drivers/char/tpm/tpm_crb.c | 53 ++++++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 52 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 089fcf8..abc29ad 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 +86,7 @@ struct crb_priv {
>  	u8 __iomem *cmd;
>  	u8 __iomem *rsp;
>  	u32 cmd_size;
> +	u32 smc_func_id;
>  };
>  
>  /**
> @@ -101,7 +106,8 @@ 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 +135,8 @@ 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 +209,32 @@ 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 +262,11 @@ 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;
>  }
>  
> @@ -445,6 +483,17 @@ 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 - default_len) !=
> +		    sizeof(struct tpm2_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;
> +		}
> +		priv->flags |= CRB_FL_CRB_SMC_START;
> +		priv->smc_func_id = buf->platform_data.smc_params.smc_func_id;
> +	}
> +
>  	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.
> 

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
Jiandi An March 17, 2017, 12:31 a.m.
On 03/15/17 11:03, Jarkko Sakkinen wrote:
> On Tue, Mar 14, 2017 at 08:32:33PM -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.
>>
>> An 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@codeaurora.org>
>> ---
>> v2
>> - Squash commit of inline SMC function with commit of
>>    tpm_crb driver change for TPM CRB ARM64 enablement
>> - Replace WARN to dev_err FW_BUG in tpm_crb_smc_start()
>> - Fix dev_err to indicate FW_BUG for wrong size of TPM2
>>    ACPI table with SMC start method
>> - Make tpm_crb driver only dependent on ACPI in Kconfig
>
> The change log should be in the cover letter not scattered in the
> patches if you send more than one patch.

Will move change log to cover letter next time.
- Jiandi

>
>>
>>   drivers/char/tpm/Kconfig   |  2 +-
>>   drivers/char/tpm/tpm_crb.c | 53
> ++++++++++++++++++++++++++++++++++++++++++++--
>>   2 files changed, 52 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 089fcf8..abc29ad 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 +86,7 @@ struct crb_priv {
>>   	u8 __iomem *cmd;
>>   	u8 __iomem *rsp;
>>   	u32 cmd_size;
>> +	u32 smc_func_id;
>>   };
>>
>>   /**
>> @@ -101,7 +106,8 @@ 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 +135,8 @@ 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 +209,32 @@ 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 +262,11 @@ 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;
>>   }
>>
>> @@ -445,6 +483,17 @@ 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 - default_len) !=
>> +		    sizeof(struct tpm2_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;
>> +		}
>> +		priv->flags |= CRB_FL_CRB_SMC_START;
>> +		priv->smc_func_id =
> buf->platform_data.smc_params.smc_func_id;
>> +	}
>> +
>>   	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.
>>
>
> --------------------------------------------------------------------------
> ----
> 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
> tpmdd-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
>

Patch hide | download patch | download mbox

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 089fcf8..abc29ad 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 +86,7 @@  struct crb_priv {
 	u8 __iomem *cmd;
 	u8 __iomem *rsp;
 	u32 cmd_size;
+	u32 smc_func_id;
 };
 
 /**
@@ -101,7 +106,8 @@  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 +135,8 @@  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 +209,32 @@  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 +262,11 @@  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;
 }
 
@@ -445,6 +483,17 @@  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 - default_len) !=
+		    sizeof(struct tpm2_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;
+		}
+		priv->flags |= CRB_FL_CRB_SMC_START;
+		priv->smc_func_id = buf->platform_data.smc_params.smc_func_id;
+	}
+
 	rc = crb_map_io(device, priv, buf);
 	if (rc)
 		return rc;