On Fri, May 09, 2025 at 10:57:10AM +0200, Stefano Garzarella wrote:
> From: Stefano Garzarella <sgarz...@redhat.com>
>
> Add a new `buf_size` parameter to the `.send` callback in `tpm_class_ops`.
> This parameter will allow drivers to differentiate between the actual
> command length to send and the total buffer size. Currently `buf_now` is
> not used, but it will be used to implement devices with synchronous send()
> to send the command and receive the response on the same buffer.
>
> Also rename the previous parameter `len` to `cmd_len` in the declaration
> to make it clear that it contains the length in bytes of the command
> stored in the buffer. The semantics don't change and it can be used as
> before by drivers. This is an optimization since the drivers could get it
> from the header, but let's avoid duplicating code.
>
> While we are here, resolve a checkpatch warning:
> WARNING: Unnecessary space before function pointer arguments
> #66: FILE: include/linux/tpm.h:90:
> + int (*send) (struct tpm_chip *chip, u8 *buf, size_t cmd_len,
>
> Suggested-by: Jarkko Sakkinen <jar...@kernel.org>
> Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
> ---
> v4:
> - rework the commit description [Jarkko]
> ---
> include/linux/tpm.h | 3 ++-
> drivers/char/tpm/st33zp24/st33zp24.c | 2 +-
> drivers/char/tpm/tpm-interface.c | 2 +-
> drivers/char/tpm/tpm_atmel.c | 3 ++-
> drivers/char/tpm/tpm_crb.c | 2 +-
> drivers/char/tpm/tpm_ftpm_tee.c | 4 +++-
> drivers/char/tpm/tpm_i2c_atmel.c | 3 ++-
> drivers/char/tpm/tpm_i2c_infineon.c | 3 ++-
> drivers/char/tpm/tpm_i2c_nuvoton.c | 3 ++-
> drivers/char/tpm/tpm_ibmvtpm.c | 6 ++++--
> drivers/char/tpm/tpm_infineon.c | 3 ++-
> drivers/char/tpm/tpm_nsc.c | 3 ++-
> drivers/char/tpm/tpm_svsm.c | 3 ++-
> drivers/char/tpm/tpm_tis_core.c | 3 ++-
> drivers/char/tpm/tpm_tis_i2c_cr50.c | 6 ++++--
> drivers/char/tpm/tpm_vtpm_proxy.c | 4 +++-
> drivers/char/tpm/xen-tpmfront.c | 3 ++-
> 17 files changed, 37 insertions(+), 19 deletions(-)
>
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 9ac9768cc8f7..7ac390ec89ce 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -87,7 +87,8 @@ struct tpm_class_ops {
> const u8 req_complete_val;
> bool (*req_canceled)(struct tpm_chip *chip, u8 status);
> int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
> - int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
> + int (*send)(struct tpm_chip *chip, u8 *buf, size_t cmd_len,
> + size_t buf_size);
I'm sorry but now that I look at this, just for the sake of consistency:
int (*send)(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
size_t cmd_len);
I.e. match the order and parameter names from tpm_try_transmit().
BR, Jarkko
