On Mon, 2009-05-18 at 13:51 +0800, Yu Zhao wrote:
>
> +static struct device_domain_info *iommu_support_dev_iotlb(
> + struct dmar_domain *domain, int segment, u8 bus, u8 devfn)
> +{
> + int found = 0;
> + unsigned long flags;
> + struct device_domain_info *info;
> + struct intel_iommu *iommu = device_to_iommu(segment, bus,
> devfn);
> +
> + if (!ecap_dev_iotlb_support(iommu->ecap))
> + return NULL;
> +
> + if (!iommu->qi)
> + return NULL;
> +
> + spin_lock_irqsave(&device_domain_lock, flags);
> + list_for_each_entry(info, &domain->devices, link)
> + if (info->bus == bus && info->devfn == devfn) {
> + found = 1;
> + break;
> + }
> + spin_unlock_irqrestore(&device_domain_lock, flags);
What if there's more than one device? You only enable ATS for the first
device that supports it, and ignore the others?
--
David Woodhouse Open Source Technology Centre
[email protected] Intel Corporation
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