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Message-ID: <20181105214233.GF26868@zn.tnic>
Date: Mon, 5 Nov 2018 22:42:33 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Woods, Brian" <Brian.Woods@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"x86@...nel.org" <x86@...nel.org>,
Clemens Ladisch <clemens@...isch.de>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Bjorn Helgaas <bhelgaas@...gle.com>, Pu Wen <puwen@...on.cn>,
Jia Zhang <qianyue.zj@...baba-inc.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 2/4] x86/amd_nb: add support for newer PCI topologies
On Mon, Nov 05, 2018 at 08:33:34PM +0000, Woods, Brian wrote:
> I think having them togeter is cleaner. If you aren't finding any
> misc IDs, I highly doubt you'll find any root IDs. There shouldn't
> be much of a difference in how fast the function exits, either way.
> If you want it the other way though, I don't mind changing it.
Yes please. Because this is the usual kernel coding style of calling a
function (or a loop which has some result in this case) and testing that
result immediately after the function call.
> Would
>
> /*
> * If there are more PCI root devices than data fabric/
> * system management network interfaces, then the (N)
> * PCI roots per DF/SMN interface are functionally the
> * same (for DF/SMN access) and N-1 are redundant. The
> * N-1 PCI roots should be skipped per DF/SMN interface
> * so the DF/SMN interfaces get mapped to the correct
> * PCI root.
You say "correct" as there is a special one. But the text before it says
they're "functionally the same" wrt DF/SMN access so it sounds to me
like we wanna map the first one we find and ignore the others.
I.e., we wanna say
"... so the DF/SMN interfaces get mapped to the *first* PCI root and the
others N-1 ignored."
Or am I misreading this?
Thx.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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