linux-kernel - Re: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base

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Message-ID: <20160209181949.GC4348@leverpostej>
Date:	Tue, 9 Feb 2016 18:19:50 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Robin Murphy <robin.murphy@....com>
Cc:	Stuart Yoder <stuart.yoder@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"frowand.list@...il.com" <frowand.list@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"david.daney@...ium.com" <david.daney@...ium.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] of/irq: Fix msi-map calculation for nonzero rid-base

On Tue, Feb 09, 2016 at 04:17:33PM +0000, Robin Murphy wrote:
> On 09/02/16 16:08, Mark Rutland wrote:
> [...]
> 
> >>>>having msi-map-mask clash with a nonzero rid-base, as that's another
> >>>>thing one can easily get wrong.
> 
> [...]
> 
> >>>>+		if (rid_base & ~map_mask) {
> >>>>+			dev_err(parent_dev,
> >>>>+				"Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-
> >>>base (0x%x)\n",
> >>>>+				map_mask, rid_base);
> >>>>+			return rid_out;
> >>>>+		}
> 
> [...]
> 
> >>                    msi-map = <0x0100 &its 0x11 0x1>;
> >>                    msi-map-mask = <0xff>;
> >>
> >
> >I'd say that this is an inconsistent set of properties, and it's
> >probably worth warning if we encounter this. There is no possible way
> >that rid-base can be encountered.
> 
> Indeed ;)

Ah!

FWIW:

Acked-by: Mark Rutland <mark.rutland@....com>

Though it would be nice if we could fail the translation entirely rather
than just logging an error and idmapping the rid.

Thanks,
Mark.