Re: [tpmdd-devel] [PATCH] tpm: remove chip_num parameter from in-kernel API

[Jason Gunthorpe]

On Tue, Oct 24, 2017 at 10:02:00AM -0700, Dmitry Torokhov wrote:
> tpm-rng is abomination that should be kicked out as soon as possible.
> It wrecks havoc with the power management (TPM chip drivers may go
> into suspend state, but tpm_rng does not do any power management and
> happily forwards requests to suspended hardware) and may be available
> when there is no TPM at all yet (the drivers have not been probed yet,
> or have gotten a deferral, etc).

Makes sense

> TPM core should register HWRNGs when chips are ready.

The main thing I've wanted from the TPM RNG is
'add_early_randomness'..

We can certainly provide a TPM interface to hwrng, it seems
reasonable.

Excep that we already have a user api in /dev/tpm to access the
tpm RNG, is the duplication a problem?

Jason