linux-kernel - Re: [PATCHv5 7/7] pciutils: Allow 32-bit domains

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Date:	Thu, 17 Dec 2015 17:34:46 +0000
From:	Keith Busch <keith.busch@...el.com>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	linux-pci@...r.kernel.org, Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Bryan Veal <bryan.e.veal@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Martin Mares <mj@....cz>,
	Jon Derrick <jonathan.derrick@...el.com>
Subject: Re: [PATCHv5 7/7] pciutils: Allow 32-bit domains

On Thu, Dec 17, 2015 at 11:15:45AM -0600, Bjorn Helgaas wrote:
> > @@ -45,7 +45,7 @@ pci_filter_parse_slot_v33(struct pci_filter *f, char *str)
> >  	  if (str[0] && strcmp(str, "*"))
> >  	    {
> >  	      long int x = strtol(str, &e, 16);
> > -	      if ((e && *e) || (x < 0 || x > 0xffff))
> > +	      if ((e && *e) || (x < 0))
> 
> Just out of curiosity (I don't maintain pciutils; Martin would apply
> this one), is there some part of the PCI or PCI firmware spec that is
> relevant to this change?  Maybe this is connected to parsing things
> exported by the kernel and not directly tied to PCI at the spec level.
>
> Whatever it is, a pointer to the producer of the information you're
> consuming here would help us understand and review the patch.

Hi Bjorn,

This is not tied to anything defined in PCI spec. Domain numbers being
a software construct (ACPI6, §6.5.6), we don't need to constrain the
representation. ACPI defines 16-bit segments, and domains provided by
this new host bridge do not define _SEG, so this series proposes domain
numbers outside the ACPI reachable range to avoid potential clashes.

The pciutils patch just synchronizes the essential tooling software with
the kernel software's new representation.
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