On Mon, Aug 09, 2021 at 03:21:59PM -0400, Stefan Berger wrote:
> From: Stefan Berger <stefanb@xxxxxxxxxxxxx>
>
> Rename the field tpm_processing_cmd to tpm_status in ibmvtpm_dev and set
> the TPM_STATUS_BUSY flag while the vTPM is busy processing a command.
>
> Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> Cc: Nayna Jain <nayna@xxxxxxxxxxxxx>
> Cc: George Wilson <gcwilson@xxxxxxxxxxxxx>
> ---
> drivers/char/tpm/tpm_ibmvtpm.c | 15 ++++++++-------
> drivers/char/tpm/tpm_ibmvtpm.h | 3 ++-
> 2 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
> index 7a9eca5768f8..5d795866b483 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -215,11 +215,12 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> return -EIO;
> }
>
> - if (ibmvtpm->tpm_processing_cmd) {
> + if ((ibmvtpm->tpm_status & TPM_STATUS_BUSY)) {
> dev_info(ibmvtpm->dev,
> "Need to wait for TPM to finish\n");
> /* wait for previous command to finish */
> - sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
> + sig = wait_event_interruptible(ibmvtpm->wq,
> + (ibmvtpm->tpm_status & TPM_STATUS_BUSY) == 0);
> if (sig)
> return -EINTR;
> }
> @@ -232,7 +233,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> * set the processing flag before the Hcall, since we may get the
> * result (interrupt) before even being able to check rc.
> */
> - ibmvtpm->tpm_processing_cmd = true;
> + ibmvtpm->tpm_status |= TPM_STATUS_BUSY;
>
> again:
> rc = ibmvtpm_send_crq(ibmvtpm->vdev,
> @@ -250,7 +251,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> goto again;
> }
> dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
> - ibmvtpm->tpm_processing_cmd = false;
> + ibmvtpm->tpm_status &= ~TPM_STATUS_BUSY;
> }
>
> spin_unlock(&ibmvtpm->rtce_lock);
> @@ -266,7 +267,7 @@ static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
> {
> struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
>
> - return ibmvtpm->tpm_processing_cmd;
> + return ibmvtpm->tpm_status;
> }
>
> /**
> @@ -454,7 +455,7 @@ static const struct tpm_class_ops tpm_ibmvtpm = {
> .send = tpm_ibmvtpm_send,
> .cancel = tpm_ibmvtpm_cancel,
> .status = tpm_ibmvtpm_status,
> - .req_complete_mask = true,
> + .req_complete_mask = TPM_STATUS_BUSY,
> .req_complete_val = 0,
> .req_canceled = tpm_ibmvtpm_req_canceled,
> };
> @@ -547,7 +548,7 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
> case VTPM_TPM_COMMAND_RES:
> /* len of the data in rtce buffer */
> ibmvtpm->res_len = be16_to_cpu(crq->len);
> - ibmvtpm->tpm_processing_cmd = false;
> + ibmvtpm->tpm_status &= ~TPM_STATUS_BUSY;
> wake_up_interruptible(&ibmvtpm->wq);
> return;
> default:
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h
> index 51198b137461..252f1cccdfc5 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.h
> +++ b/drivers/char/tpm/tpm_ibmvtpm.h
> @@ -41,7 +41,8 @@ struct ibmvtpm_dev {
> wait_queue_head_t wq;
> u16 res_len;
> u32 vtpm_version;
> - u8 tpm_processing_cmd;
> + u8 tpm_status;
> +#define TPM_STATUS_BUSY (1 << 0) /* vtpm is processing a command */
Declare this already in the fix, and just leave the rename here.
> };
>
> #define CRQ_RES_BUF_SIZE PAGE_SIZE
> --
> 2.31.1
>
>
Otherwise, these look fine.
/Jarkko
