linux-kernel - Re: [PATCH v2 1/1] MIPS: Malta: Use pcibios_align

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Message-ID: <alpine.DEB.2.21.2510211536330.8377@angie.orcam.me.uk>
Date: Tue, 21 Oct 2025 15:41:01 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
cc: Bjorn Helgaas <helgaas@...nel.org>, 
    Thomas Bogendoerfer <tsbogend@...ha.franken.de>, linux-pci@...r.kernel.org, 
    Guenter Roeck <linux@...ck-us.net>, Bjorn Helgaas <bhelgaas@...gle.com>, 
    linux-mips@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] MIPS: Malta: Use pcibios_align_resource() to
 block io range

On Tue, 21 Oct 2025, Ilpo Järvinen wrote:

> > > If the missing resource reservations (dma1, tiger, dma page reg)
> > > mentioned by Maciej are an issue or can be fixed up, let me know and
> > > we can amend this.
> > 
> >  NB this comes from `plat_mem_setup' in arch/mips/mti-malta/malta-setup.c 
> > iterating over `standard_io_resources'.  ISTR now this being my original 
> > reason to come up with the approach taken with commit aa0980b80908 rather 
> > than using PCIBIOS_MIN_IO.  Since the ranges are now owned by the PCI host 
> > bridge, calls to `request_resource' referring `ioport_resource' fail.
> 
> So this platform would actually need multiple root bus IO resources to 
> cover PIIX4 range without capturing non-PCI ranges?

 I've got it covered now; will send patches shortly.  It was easier than I 
thought, phew!

  Maciej