Re: [tpmdd-devel] tpm device not showing up in /dev anymore

[Jason Gunthorpe <jgg@ziepe.ca>]

On Sat, Nov 11, 2017 at 12:12:57PM -0700, Jerry Snitselaar wrote:

> Before the release_locality code would only actually release the
> locality if the request use bit was set. So after it grabbed the
> locality during probe it probably never released it. The idea with the
> new code was to release it when it was no longer needed so another
> requester would be able to take the tpm without having to wait for it
> to be released.

If I recall, this was so that system level things outside linux could
access the TPM properly??

> With the old code I think it would have to wait either
> until the next time release_locality was called, or attempt to seize
> the tpm with the seize bit in the access register. I need to read
> through the spec some more, but does the tpm ever force a change when
> the request use bit is set, or does it leave it up to the software
> to deal with it and only gets involved in the case where the seize
> bit has been set?

Do we handle these cases? Maybe something like that has happened..

Jason