linux-kernel - Re: [PATCH] intel/iommu: force writebuffer-flush quirk on Gen 4 Chipsets

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Message-ID: <1358880935.5523.147.camel@shinybook.infradead.org>
Date:	Tue, 22 Jan 2013 12:55:35 -0600
From:	David Woodhouse <dwmw2@...radead.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	"Sankaran, Rajesh" <rajesh.sankaran@...el.com>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH] intel/iommu: force writebuffer-flush quirk on Gen 4
 Chipsets

On Mon, 2013-01-21 at 19:48 +0100, Daniel Vetter wrote:
> We already have the quirk entry for the mobile platform, but also
> reports on some desktop versions. So be paranoid and set it
> everywhere.
> 
> References: http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg33138.html
> Cc: stable@...r.kernel.org
> Cc: David Woodhouse <dwmw2@...radead.org>
> Reported-and-tested-by: Mihai Moldovan <ionic@...ic.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
>  drivers/iommu/intel-iommu.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 9743769..19854bf 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -4215,13 +4215,19 @@ static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
>  {
>  	/*
>  	 * Mobile 4 Series Chipset neglects to set RWBF capability,
> -	 * but needs it:
> +	 * but needs it. Same seems to hold for the desktop versions.
>  	 */
>  	printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n");
>  	rwbf_quirk = 1;
>  }
>  
>  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e10, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e20, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e30, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e40, quirk_iommu_rwbf);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e90, quirk_iommu_rwbf);
>  
>  #define GGC 0x52
>  #define GGC_MEMORY_SIZE_MASK	(0xf << 8)

Again, I'm really unhappy about doing this kind of thing based on
hearsay. This should have a specific reference (with URL) to a published
erratum. Rajesh?

-- 
dwmw2


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