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

["Jarkko Sakkinen" <jarkko@kernel.org>]

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.

Fair enough?

BR, Jarkko