Re: BUG in drivers/dma/ioat/dma_v2.c:314

[David Woodhouse]

On Wed, 2010-07-14 at 22:41 -0700, Dan Williams wrote:
> +       for_each_drhd_unit(drhd)
> +               for (i = 0; i < drhd->devices_cnt; i++) {
> +                       /* we know that the this device's iommu is at
> +                        * offset 0xa000 from vtbar
> +                        */
> +                       if (drhd->devices[i] == pdev &&
> +                           drhd->reg_base_addr - vtbar != 0xa000) {
> +                               WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
> +                                               "BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n");
> +                               pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
> +                               return;
> +                       }
> +               }
> +} 

Ah, that's the problem. Sorry, should have noticed this before. Since
this is the catch-all IOMMU, the device isn't explicitly listed.

You want 'drhd = dmar_find_matched_drhd_unit(pdev);' and then compare
vtbar with the reg_base_addr of that one.

-- 
dwmw2

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