[PATCH] tpm: add support for partial reads

[Tadeusz Struk]

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:
> https://github.com/tpm2-software/tpm2-tss/commit/ce982f67a67dc08e24683d30b05800648d8a264c
> 
> Signed-off-by: Tadeusz Struk <tadeusz.struk at intel.com>

This needs to go on top of this:
https://patchwork.kernel.org/patch/10460863/

Thanks,
-- 
Tadeusz
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