Re: [PATCH 1/3] x86/amd_nb: Add support for HSMP mailbox access
From: Borislav Petkov <bp@alien8.de>
Date: 2021-09-02 17:58:08
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On Thu, Sep 02, 2021 at 11:11:53PM +0530, Naveen Krishna Chatradhi wrote:
On Fam19h server CPUs from AMD an HSMP (Host System Management Port) mailbox interface is added to monitor and manage the CPU parameters.
Mailbox? Hmm, that rings a bell. There's drivers/mailbox/ with a bunch
of drivers in there. Those are
"Mailbox is a framework to control hardware communication between
on-chip processors through queued messages and interrupt driven
signals."
I wonder if that HSMP thing can be wrapped like a mailbox driver...
If not, I still don't like it being slapped in amd_nb.c where it would
be built in on *all* AMD hardware which is kinda too much.
You could make it a separate driver module called amd_hsmp.ko which
loads only on the appropriate hw and uses amd_nb.c for detection only
like the other drivers, for example.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette