Re: [PATCH v9 05/17] tpm: declare struct tpm_header

Jarkko Sakkinen
2018-11-20T13:08:13Z

On Mon, Nov 19, 2018 at 09:33:31PM +0000, Winkler, Tomas wrote:
>
> >
> > Decleare struct tpm_header that replaces struct tpm_input_header and
> Typo

Thanks, will fix for the next version.

> > struct tpm_output_header.
> >
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> > ---
> > drivers/char/tpm/tpm-interface.c | 9 ++++-----
> > drivers/char/tpm/tpm.h | 27 ++++++++++++---------------
> > drivers/char/tpm/tpm2-cmd.c | 4 ++--
> > drivers/char/tpm/tpm2-space.c | 6 +++---
> > drivers/char/tpm/tpm_i2c_atmel.c | 5 ++---
> > drivers/char/tpm/tpm_vtpm_proxy.c | 8 ++++----
> > drivers/char/tpm/xen-tpmfront.c | 2 +-
> > 7 files changed, 28 insertions(+), 33 deletions(-)
> >
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> > interface.c
> > index 7ac6ada8428c..cb0d44c158ae 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip
> > *chip,
> > const u8 *cmd,
> > size_t len)
> > {
> > - const struct tpm_input_header *header = (const void *)cmd;
> > + const struct tpm_header *header = (const void *)cmd;
>
>
> Sometimes it is casted (void *), sometimes (struct tpm_header *)
> Better to use one convention

I would prefer (const void *) because it is shorter form, and no
need to duplicate the type name two times, that way also more
readable. Anyway, agreed that we do have inconsistency with these.

>
> > int i;
> > u32 cc;
> > u32 attrs;
> > @@ -166,7 +166,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> > *chip,
> > u8 *buf, size_t bufsiz,
> > unsigned int flags)
> > {
> > - struct tpm_output_header *header = (void *)buf;
> > + struct tpm_header *header = (void *)buf;
> > int rc;
> > ssize_t len = 0;
> > u32 count, ordinal;
> > @@ -316,7 +316,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> > *chip, ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
> > u8 *buf, size_t bufsiz, unsigned int flags) {
> > - struct tpm_output_header *header = (struct tpm_output_header
> > *)buf;
> > + struct tpm_header *header = (struct tpm_header *)buf;
> > /* space for header and handles */
> > u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
> > unsigned int delay_msec = TPM2_DURATION_SHORT; @@ -381,8
> > +381,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct
> > tpm_space *space,
> > struct tpm_buf *buf, size_t min_rsp_body_length,
> > unsigned int flags, const char *desc) {
> > - const struct tpm_output_header *header =
> > - (struct tpm_output_header *)buf->data;
> > + const struct tpm_header *header = (struct tpm_header *)buf->data;
> > int err;
> > ssize_t len;
> >
> > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index
> > 49bca4d1e786..86fa8ac0ae20 100644
> > --- a/drivers/char/tpm/tpm.h
> > +++ b/drivers/char/tpm/tpm.h
> > @@ -273,16 +273,13 @@ struct tpm_chip {
> >
> > #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
> >
> > -struct tpm_input_header {
> > - __be16 tag;
> > - __be32 length;
> > - __be32 ordinal;
> > -} __packed;
> > -
> > -struct tpm_output_header {
> > - __be16 tag;
> > - __be32 length;
> > - __be32 return_code;
> > +struct tpm_header {
> Does it deserve kdoc?

Could be done if this is needed at some point in include/linux/tpm.h.
Do not see it right now as high priority.

> > + __be16 tag;
> > + __be32 length;
> > + union {
> > + __be32 ordinal;
> > + __be32 return_code;
> > + };
> > } __packed;
> >
> > #define TPM_TAG_RQU_COMMAND 193
> > @@ -401,8 +398,8 @@ struct tpm_buf {
> >
> > static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) {
> > - struct tpm_input_header *head;
> > - head = (struct tpm_input_header *)buf->data;
> > + struct tpm_header *head = (struct tpm_header *)buf->data;
> > +
> > head->tag = cpu_to_be16(tag);
> > head->length = cpu_to_be32(sizeof(*head));
> > head->ordinal = cpu_to_be32(ordinal);
> > @@ -428,14 +425,14 @@ static inline void tpm_buf_destroy(struct tpm_buf
> > *buf)
> >
> > static inline u32 tpm_buf_length(struct tpm_buf *buf) {
> > - struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> No blank after ) in casting.

And also here void casting would make sense.

>
> > + struct tpm_header *head = (struct tpm_header *) buf->data;
> >
> > return be32_to_cpu(head->length);
> > }
> >
> > static inline u16 tpm_buf_tag(struct tpm_buf *buf) {
> > - struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> > + struct tpm_header *head = (struct tpm_header *) buf->data;
> >
> > return be16_to_cpu(head->tag);
> > }
> > @@ -444,7 +441,7 @@ static inline void tpm_buf_append(struct tpm_buf
> > *buf,
> > const unsigned char *new_data,
> > unsigned int new_len)
> > {
> > - struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> > + struct tpm_header *head = (struct tpm_header *) buf->data;
> No blank after ) in casting.
> > u32 len = tpm_buf_length(buf);
> >
> > /* Return silently if overflow has already happened. */ diff --git
> > a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index
> > 2bcf470c8e5d..ab03f8600f89 100644
> > --- a/drivers/char/tpm/tpm2-cmd.c
> > +++ b/drivers/char/tpm/tpm2-cmd.c
> > @@ -784,7 +784,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
> > */
> > int tpm2_probe(struct tpm_chip *chip)
> > {
> > - struct tpm_output_header *out;
> > + struct tpm_header *out;
> > struct tpm_buf buf;
> > int rc;
> >
> > @@ -797,7 +797,7 @@ int tpm2_probe(struct tpm_chip *chip)
> > rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
> > /* We ignore TPM return codes on purpose. */
> > if (rc >= 0) {
> > - out = (struct tpm_output_header *)buf.data;
> > + out = (struct tpm_header *)buf.data;
> > if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
> > chip->flags |= TPM_CHIP_FLAG_TPM2;
> > }
> > diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> > index 5ecc73988f7c..862ee1ce1755 100644
> > --- a/drivers/char/tpm/tpm2-space.c
> > +++ b/drivers/char/tpm/tpm2-space.c
> > @@ -334,7 +334,7 @@ static int tpm2_map_response_header(struct
> > tpm_chip *chip, u32 cc, u8 *rsp,
> > size_t len)
> > {
> > struct tpm_space *space = &chip->work_space;
> > - struct tpm_output_header *header = (void *)rsp;
> > + struct tpm_header *header = (void *)rsp;
> > u32 phandle;
> > u32 phandle_type;
> > u32 vhandle;
> > @@ -394,7 +394,7 @@ static int tpm2_map_response_body(struct tpm_chip
> > *chip, u32 cc, u8 *rsp,
> > size_t len)
> > {
> > struct tpm_space *space = &chip->work_space;
> > - struct tpm_output_header *header = (void *)rsp;
> > + struct tpm_header *header = (void *)rsp;
> > struct tpm2_cap_handles *data;
> > u32 phandle;
> > u32 phandle_type;
> > @@ -492,7 +492,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
> > int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
> > u32 cc, u8 *buf, size_t *bufsiz) {
> > - struct tpm_output_header *header = (void *)buf;
> > + struct tpm_header *header = (void *)buf;
> > int rc;
> >
> > if (!space)
> > diff --git a/drivers/char/tpm/tpm_i2c_atmel.c
> > b/drivers/char/tpm/tpm_i2c_atmel.c
> > index 95ce2e9ccdc6..4720b2442ffe 100644
> > --- a/drivers/char/tpm/tpm_i2c_atmel.c
> > +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> > @@ -46,7 +46,7 @@ struct priv_data {
> > /* This is the amount we read on the first try. 25 was chosen to fit a
> > * fair number of read responses in the buffer so a 2nd retry can be
> > * avoided in small message cases. */
> > - u8 buffer[sizeof(struct tpm_output_header) + 25];
> > + u8 buffer[sizeof(struct tpm_header) + 25];
> > };
> >
> > static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len) @@ -
> > 72,8 +72,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf,
> > size_t count) {
> > struct priv_data *priv = dev_get_drvdata(&chip->dev);
> > struct i2c_client *client = to_i2c_client(chip->dev.parent);
> > - struct tpm_output_header *hdr =
> > - (struct tpm_output_header *)priv->buffer;
> > + struct tpm_header *hdr = (struct tpm_header *)priv->buffer;
> > u32 expected_len;
> > int rc;
> >
> > diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c
> > b/drivers/char/tpm/tpm_vtpm_proxy.c
> > index 5f95fbfb7f6b..28eb5ab15b99 100644
> > --- a/drivers/char/tpm/tpm_vtpm_proxy.c
> > +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> > @@ -303,9 +303,9 @@ static int vtpm_proxy_tpm_op_recv(struct tpm_chip
> > *chip, u8 *buf, size_t count) static int
> > vtpm_proxy_is_driver_command(struct tpm_chip *chip,
> > u8 *buf, size_t count)
> > {
> > - struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
> > + struct tpm_header *hdr = (struct tpm_header *)buf;
> >
> > - if (count < sizeof(struct tpm_input_header))
> > + if (count < sizeof(struct tpm_header))
> > return 0;
> >
> > if (chip->flags & TPM_CHIP_FLAG_TPM2) { @@ -402,7 +402,7 @@
> > static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) {
> > struct tpm_buf buf;
> > int rc;
> > - const struct tpm_output_header *header;
> > + const struct tpm_header *header;
> > struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
> >
> > if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > @@ -427,7 +427,7 @@ static int vtpm_proxy_request_locality(struct
> > tpm_chip *chip, int locality)
> > goto out;
> > }
> >
> > - header = (const struct tpm_output_header *)buf.data;
> > + header = (const struct tpm_header *)buf.data;
> > rc = be32_to_cpu(header->return_code);
> > if (rc)
> > locality = -1;
> > diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-
> > tpmfront.c index b150f87f38f5..1259e935fd58 100644
> > --- a/drivers/char/tpm/xen-tpmfront.c
> > +++ b/drivers/char/tpm/xen-tpmfront.c
> > @@ -163,7 +163,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf,
> > size_t count)
> > wmb();
> > notify_remote_via_evtchn(priv->evtchn);
> >
> > - ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
> > + ordinal = be32_to_cpu(((struct tpm_header *)buf)->ordinal);
> > duration = tpm_calc_ordinal_duration(chip, ordinal);
> >
> > if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
> > --
> > 2.19.1
>

Thank you. Really useful feedback.

/Jarkko