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Message-ID: <20170818002145.62fb72eb@naga>
Date: Fri, 18 Aug 2017 00:21:45 +0200
From: msuchanek <msuchanek@...e.de>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Ashley Lai <ashleydlai@...il.com>,
Peter Huewe <peterhuewe@....de>,
Marcel Selhorst <tpmdd@...horst.net>,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
linuxppc-dev@...ts.ozlabs.org, tpmdd-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Cc: tpmdd@...horst.ne
Subject: Re: [RFT PATCH] tpm: ibmvtpm: simplify crq initialization and
document crq format
ping?
On Fri, 24 Feb 2017 20:35:16 +0100
Michal Suchanek <msuchanek@...e.de> wrote:
> The crq is passed in registers and is the same on BE and LE hosts.
> However, current implementation allocates a structure on-stack to
> represent the crq, initializes the members swapping them to BE, and
> loads the structure swapping it from BE. This is pointless and causes
> GCC warnings about ununitialized members. Get rid of the structure and
> the warnings.
>
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
> v2
>
> fix typos and spelling in comments
> ---
> drivers/char/tpm/tpm_ibmvtpm.c | 96
> ++++++++++++++++++++++++++---------------- 1 file changed, 60
> insertions(+), 36 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c
> b/drivers/char/tpm/tpm_ibmvtpm.c index 1b9d61ffe991..89027339d55f
> 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -39,19 +39,63 @@ static struct vio_device_id
> tpm_ibmvtpm_device_table[] = { MODULE_DEVICE_TABLE(vio,
> tpm_ibmvtpm_device_table);
> /**
> + *
> + * ibmvtpm_send_crq_word - Send a CRQ request
> + * @vdev: vio device struct
> + * @w1: pre-constructed first word of tpm crq (second
> word is reserved)
> + *
> + * Return:
> + * 0 - Success
> + * Non-zero - Failure
> + */
> +static int ibmvtpm_send_crq_word(struct vio_dev *vdev, u64 w1)
> +{
> + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address,
> w1, 0); +}
> +
> +/**
> + *
> * ibmvtpm_send_crq - Send a CRQ request
> *
> * @vdev: vio device struct
> - * @w1: first word
> - * @w2: second word
> + * @valid: Valid field
> + * @msg: Type field
> + * @len: Length field
> + * @data: Data field
> + *
> + * The ibmvtpm crq is defined as follows:
> + *
> + * Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
> 7
> + *
> -----------------------------------------------------------------------
> + * Word0 | Valid | Type | Length | Data
> + *
> -----------------------------------------------------------------------
> + * Word1 | Reserved
> + *
> -----------------------------------------------------------------------
> + *
> + * Which matches the following structure (on bigendian host):
> + *
> + * struct ibmvtpm_crq {
> + * u8 valid;
> + * u8 msg;
> + * __be16 len;
> + * __be32 data;
> + * __be64 reserved;
> + * } __attribute__((packed, aligned(8)));
> + *
> + * However, the value is passed in a register so just compute the
> numeric value
> + * to load into the register avoiding byteswap altogether. Endian
> only affects
> + * memory loads and stores - registers are internally represented
> the same. *
> * Return:
> - * 0 -Sucess
> + * 0 (H_SUCCESS) - Success
> * Non-zero - Failure
> */
> -static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
> +static int ibmvtpm_send_crq(struct vio_dev *vdev,
> + u8 valid, u8 msg, u16 len, u32 data)
> {
> - return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address,
> w1, w2);
> + u64 w1 = ((u64)valid << 56) | ((u64)msg << 48) | ((u64)len
> << 32) |
> + (u64)data;
> + return ibmvtpm_send_crq_word(vdev, w1);
> }
>
> /**
> @@ -109,8 +153,6 @@ static int tpm_ibmvtpm_recv(struct tpm_chip
> *chip, u8 *buf, size_t count) static int tpm_ibmvtpm_send(struct
> tpm_chip *chip, u8 *buf, size_t count) {
> struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
> - struct ibmvtpm_crq crq;
> - __be64 *word = (__be64 *)&crq;
> int rc, sig;
>
> if (!ibmvtpm->rtce_buf) {
> @@ -137,10 +179,6 @@ static int tpm_ibmvtpm_send(struct tpm_chip
> *chip, u8 *buf, size_t count) spin_lock(&ibmvtpm->rtce_lock);
> ibmvtpm->res_len = 0;
> memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
> - crq.valid = (u8)IBMVTPM_VALID_CMD;
> - crq.msg = (u8)VTPM_TPM_COMMAND;
> - crq.len = cpu_to_be16(count);
> - crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
>
> /*
> * set the processing flag before the Hcall, since we may
> get the @@ -148,8 +186,9 @@ static int tpm_ibmvtpm_send(struct
> tpm_chip *chip, u8 *buf, size_t count) */
> ibmvtpm->tpm_processing_cmd = true;
>
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
> - be64_to_cpu(word[1]));
> + rc = ibmvtpm_send_crq(ibmvtpm->vdev,
> + IBMVTPM_VALID_CMD, VTPM_TPM_COMMAND,
> + count, ibmvtpm->rtce_dma_handle);
> if (rc != H_SUCCESS) {
> dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed
> rc=%d\n", rc); rc = 0;
> @@ -182,15 +221,10 @@ static u8 tpm_ibmvtpm_status(struct tpm_chip
> *chip) */
> static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
> {
> - struct ibmvtpm_crq crq;
> - u64 *buf = (u64 *) &crq;
> int rc;
>
> - crq.valid = (u8)IBMVTPM_VALID_CMD;
> - crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
> -
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
> - cpu_to_be64(buf[1]));
> + rc = ibmvtpm_send_crq(ibmvtpm->vdev,
> + IBMVTPM_VALID_CMD,
> VTPM_GET_RTCE_BUFFER_SIZE, 0, 0); if (rc != H_SUCCESS)
> dev_err(ibmvtpm->dev,
> "ibmvtpm_crq_get_rtce_size failed rc=%d\n",
> rc); @@ -210,15 +244,10 @@ static int
> ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm) */
> static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
> {
> - struct ibmvtpm_crq crq;
> - u64 *buf = (u64 *) &crq;
> int rc;
>
> - crq.valid = (u8)IBMVTPM_VALID_CMD;
> - crq.msg = (u8)VTPM_GET_VERSION;
> -
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
> - cpu_to_be64(buf[1]));
> + rc = ibmvtpm_send_crq(ibmvtpm->vdev,
> + IBMVTPM_VALID_CMD, VTPM_GET_VERSION, 0, 0);
> if (rc != H_SUCCESS)
> dev_err(ibmvtpm->dev,
> "ibmvtpm_crq_get_version failed rc=%d\n",
> rc); @@ -238,7 +267,7 @@ static int
> ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm) {
> int rc;
>
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
> + rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_COMP_CMD);
> if (rc != H_SUCCESS)
> dev_err(ibmvtpm->dev,
> "ibmvtpm_crq_send_init_complete failed
> rc=%d\n", rc); @@ -258,7 +287,7 @@ static int
> ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm) {
> int rc;
>
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
> + rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_CMD);
> if (rc != H_SUCCESS)
> dev_err(ibmvtpm->dev,
> "ibmvtpm_crq_send_init failed rc=%d\n", rc);
> @@ -336,15 +365,10 @@ static int tpm_ibmvtpm_suspend(struct device
> *dev) {
> struct tpm_chip *chip = dev_get_drvdata(dev);
> struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
> - struct ibmvtpm_crq crq;
> - u64 *buf = (u64 *) &crq;
> int rc = 0;
>
> - crq.valid = (u8)IBMVTPM_VALID_CMD;
> - crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
> -
> - rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
> - cpu_to_be64(buf[1]));
> + rc = ibmvtpm_send_crq(ibmvtpm->vdev,
> + IBMVTPM_VALID_CMD, VTPM_PREPARE_TO_SUSPEND,
> 0, 0); if (rc != H_SUCCESS)
> dev_err(ibmvtpm->dev,
> "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
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