linux-kernel - Re: [PATCH] x86/dma-mapping: override via_no

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Date:   Mon, 16 Apr 2018 05:33:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     David Wang <davidwang@...oxin.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        gregkh@...uxfoundation.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, brucechang@...-alliance.com,
        cooperyan@...oxin.com, qiyuanwang@...oxin.com,
        benjaminpan@...tech.com, lukelin@...cpu.com, timguo@...oxin.com
Subject: Re: [PATCH] x86/dma-mapping: override via_no_dac for new VIA PCI
 bridges

On Mon, Apr 16, 2018 at 05:26:56PM +0800, David Wang wrote:
> PCI bridges integrated in new VIA chipset/SoC have no DAC issue.
> Enable DAC for the platforms with these chipset/SoC can improve DMA performance about
> 20% when DRAM size > 4GB.
> 

So we get an exception to an exception?  Is there any way to figure
out the PCI IDs actually affected?