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SubjectRe: [PATCH] tpm: add support for partial reads
On 07/19/2018 08:52 AM, Tadeusz Struk wrote:
> 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 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.
> The usecase is implemented in this TSS commit:
> Signed-off-by: Tadeusz Struk <>

This needs to go on top of this:


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