• Tadeusz Struk's avatar
    tpm: add support for partial reads · 9488585b
    Tadeusz Struk authored
    Currently to read a response from the TPM device an application needs
    provide big enough buffer for the whole response and read it in one go.
    The application doesn't know how big the response it beforehand so it
    always needs to maintain a 4K buffer and read the max (4K).
    In case if the user of the TSS library doesn't provide big enough
    buffer the TCTI spec says that the library should set the required
    size and return TSS2_TCTI_RC_INSUFFICIENT_BUFFER error code so that the
    application could allocate a bigger buffer and call receive again.
    To make it possible in the TSS library, this requires being able to do
    partial reads from the driver.
    The library would read the 10 bytes header first to get the actual size
    of the response from the header, and then read the rest of the response.
    
    This patch adds support for partial reads, i.e. the user can read the
    response in one or multiple reads, until the whole response is consumed.
    The user can also read only part of the response and ignore
    the rest by issuing a new write to send a new command.
    Signed-off-by: default avatarTadeusz Struk <tadeusz.struk@intel.com>
    Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
    Tested-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
    Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
    9488585b
tpm-dev.h 943 Bytes