linux-kernel - [PATCH v4 0/5] x86/PCI: Improve $PIR and add $IRT PIRQ routing support

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Date:   Thu, 31 Mar 2022 08:10:51 +0100 (BST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
cc:     Arnd Bergmann <arnd@...nel.org>, Nikolai Zhubr <zhubr.2@...il.com>,
        Michal Necasek <mnecasek@...oo.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/5] x86/PCI: Improve $PIR and add $IRT PIRQ routing
 support

Hi,

 This is an updated patch series with a fix applied to what is now 3/5 for 
a bug that was reported by Dmitry (thanks!) having triggered with his 
x86-64 setup and then nailed down by Linus (also thanks!).  Additionally 
as suggested by Linus a fix has been added, for a preexisting problem with 
the routing table not being verified to stay whole within the BIOS memory 
range, that has become 1/5, expanding the whole series from 4 to 5 changes 
now.  In the course of that addition a couple of coding style issues have 
been consumed, shrinking what has now become 5/5.  The cover letter has 
been updated accordingly throughout.

 First 1/5 handles $PIR PIRQ routing tables that lack router device
information, fixing the inability to route interrupts with a system using 
the SiS85C497 ISA bridge.

 Then 2/5 adds support for the $IRT PIRQ routing table format invented by 
AMI before Microsoft has come up with its own $PIR format.  These formats 
are very similar to each other, but the $IRT format does not provide for 
router device information, so this change relies on 1/5.  It has turned 
out needed to route interrupts with a system using the ALi M1487 ISA Bus 
Controller device, discussed earlier on in a discussion thread around: 
<https://lore.kernel.org/linux-pci/61377A45.8030003@gmail.com/>.  This 
change has been verified with an artificially created $IRT table.

 Then 3/5 adds a range check for 

 Then 3/4 corrects our link value interpretation for said M1487 device 
according to Nikolai's findings with his system reported here: 
<https://lore.kernel.org/linux-pci/61428EDF.9030203@gmail.com/>.

 Finally 4/4 corrects a couple of coding style issues around though not 
immediately within code changed by 2/4 so as to make the style consistent.

 See individual change descriptions for further details.

 Credit to Michal (cc-ed) for helping me chase documentation for the
$IRT table format.

 Please apply.

  Maciej