linux-kernel - Re: [PATCHv8 0/5] Driver for new "VMD" device

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Date:	Thu, 25 Feb 2016 14:50:15 +0000
From:	Keith Busch <keith.busch@...el.com>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	"Veal, Bryan E." <bryan.e.veal@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	linux-pci@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jon Derrick <jonathan.derrick@...el.com>
Subject: Re: [PATCHv8 0/5] Driver for new "VMD" device

On Thu, Feb 25, 2016 at 08:42:19AM -0600, Bjorn Helgaas wrote:
> On Tue, Feb 23, 2016 at 06:24:00PM +0000, Keith Busch wrote:
> > On Mon, Feb 22, 2016 at 04:10:24PM -0600, Bjorn Helgaas wrote:
> > > +	/*
> > > +	 * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
> > > +	 * put 32-bit resources in the window.
> > > +	 *
> > > +	 * There's no hardware reason why a 64-bit window *couldn't*
> > > +	 * contain a 32-bit resource, but pbus_size_mem() computes the
> > > +	 * bridge window size assuming a 64-bit window will contain no
> > > +	 * 32-bit resources.  __pci_assign_resource() enforces that
> > > +	 * artificial restriction to make sure everything will fit.
> > > +	 */
> > 
> > This sounds good to me. Thanks!
> > 
> > >  	res = &vmd->dev->resource[VMD_MEMBAR1];
> > >  	upper_bits = upper_32_bits(res->end);
> > >  	flags = res->flags & ~IORESOURCE_SIZEALIGN;
> 
> Can you prepare a patch, that adds both comments, please?  (The one
> about how we assume BIOS assigns the BAR below 4GB, and the one I
> drafted above.)

Yep, will send it out be end of today.