Re: [PATCH 1/3] tpm: Disable TCG_TPM2_HMAC by default

[Vitor Soares <ivitro@gmail.com>]

On Wed, 2024-05-22 at 19:11 +0300, Jarkko Sakkinen wrote:
> On Wed May 22, 2024 at 5:58 PM EEST, Vitor Soares wrote:
> > I did run with ftrace, but need some more time to go through it.
> > 
> > Here the step I did:
> > kernel config:
> >   CONFIG_FUNCTION_TRACER
> >   CONFIG_FUNCTION_GRAPH_TRACER
> > 
> > ftrace:
> >   # set filters
> >   echo tpm* > set_ftrace_filter
> > 
> >   # set tracer
> >   echo function_graph > current_tracer
> > 
> >   # take the sample
> >   echo 1 > tracing_on; time modprobe tpm_tis_spi; echo 0 > tracing_on
> > 
> > regards,
> > Vitor Soares
> 
> I'm now compiling distro kernel (OpenSUSE) for NUC7 with v6.10 contents.
> 
> After I have that setup, I'll develop a perf test either with perf or
> bpftrace. I'll come back with the possible CONFIG_* that should be in
> place in your kernel. Might take up until next week as I have some
> conference stuff to prepare but I try to have stuff ready early next
> week.
> 
> No need to rush with this as long as possible patches go to rc2 or rc3.
> Let's do a proper analysis instead.
> 
> In the meantime you could check if you get perf and/or bpftrace to 
> your image that use to boot up your device. Preferably both but
> please inform about this.
> 

I already have perf running, for the bpftrace I might not be able to help.

Regards,
Vitor Soares

> Fair enough?
> 
> BR, Jarkko