Re: [PATCH v3 0/2] tpm: add support for nonblocking operation

[Jarkko Sakkinen]

On Tue, Jun 19, 2018 at 05:45:35PM -0700, Tadeusz Struk wrote:
> Hi Jarkko,
> Thanks for reviewing the patch.
> There are applications/frameworks where a worker thread is not an option.
> Take for example the IoT use-cases and frameworks like IoT.js, or "Node.js for IoT".
> They are all single threaded, event-driven frameworks, using non-blocking I/O as the base of their processing model.
> Similarly embedded applications, which are basically just a single threaded event loop, quite often don't use threads because of resources constrains.
> 
> If your concern is that user space will not adopt to this, I can say that TSS library [1] is currently blocked on this feature, and we can not enable some of the use-cases mentioned above because of this.
> 
> Thanks,
> Tadeusz
> 
> [1] https://github.com/tpm2-software/tpm2-tss

I put this into "mathematical" terms. TPM is by nature is blocking. It
does not scale this way so you are essentially just simulating
non-blocking behaviour.

/Jarkko