On 03/11/17 02:42, Jarkko Sakkinen wrote:
> On Fri, Mar 10, 2017 at 03:58:09AM -0600, 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 to request the Firmware to execute
>> or cancel a TPM 2.0 command.
>>
>> Signed-off-by: Jiandi An <anjia...@codeaurora.org>
>
> Does look good to me. I might consider to squash this with the
> two inline functions.
>
> /Jarkko
I'll squash the SMC inline function patch with this in next version
to address this.
Thanks.
- Jiandi
>
>> ---
>> drivers/char/tpm/Kconfig | 2 +-
>> drivers/char/tpm/tpm_crb.c | 24 ++++++++++++++++++++++--
>> 2 files changed, 23 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
>> index d520ac5..9659f40 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 (X86 || ARM64) && 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..d29a84a 100644
>> --- a/drivers/char/tpm/tpm_crb.c
>> +++ b/drivers/char/tpm/tpm_crb.c
>> @@ -73,6 +73,7 @@ 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 +83,7 @@ struct crb_priv {
>> u8 __iomem *cmd;
>> u8 __iomem *rsp;
>> u32 cmd_size;
>> + u32 smc_func_id;
>> };
>>
>> /**
>> @@ -101,7 +103,8 @@ 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 +132,8 @@ 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);
>> @@ -229,6 +233,11 @@ 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(priv->smc_func_id);
>> + }
>> +
>> return rc;
>> }
>>
>> @@ -445,6 +454,17 @@ 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, "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.
>>
--
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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