linux-kernel - Re: [PATCH 1/4] pci/x86: don't assume pref memio are 64bit -v4

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Date:	Fri, 24 Apr 2009 17:16:41 +0400
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: Re: [PATCH 1/4] pci/x86: don't assume pref memio are 64bit -v4

On Thu, Apr 23, 2009 at 08:48:32PM -0700, Yinghai Lu wrote:
> 
> we should not assign 64bit range to pci device that only take 32bit pref
> 
> try to set IORESOURCE_MEM_64 in 64bit resource of pci_device/pci_bridge
> and make the bus resource only have that bit set when all device under that do support
> 64bit pref mem then use that flag to allocate resource in wanted area
> 
> v2: fix b_res->flags and logic and passing result.
> v3: split iomem to iomem32, iomem64, and iomem64 will take IORESOURCE_MEM_64
> V4: according to Ivan
>     make it support x86 only, by PCIBIOS_MAX_MEM_32
>     double check if the bridge does support pref mem64 with write/read UPPER32

Thanks, Yinghai.

> [Impact: do assign wrong range to device that doesn't support it]
> 
> Reported-by: Yannick <yannick.roehlly@...e.fr>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>

Reviewed-by: Ivan Kokshaysky <ink@...assic.park.msu.ru>

Ivan.
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