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Date:	Mon, 10 Mar 2014 06:04:20 -0700
From:	David Woodhouse <>
To:	Jiang Liu <>
Cc:	Joerg Roedel <>, Yinghai Lu <>,
	Bjorn Helgaas <>,
	Dan Williams <>,
	Vinod Koul <>,
	"Rafael J . Wysocki" <>,
	Tony Luck <>,,,,
Subject: Re: [Patch Part2 V2 15/17] iommu/vt-d, PCI: update DRHD/RMRR/ATSR
 device scope caches when PCI hotplug happens

On Mon, 2014-03-10 at 16:46 +0800, Jiang Liu wrote:
> Hi David,
>         Good suggestion! It should make hotplug logic simpler too.
> Will try to work out some patches for it.

Before doing so, please be aware of the WIP at

This is the support for DMA mapping for ACPI devices. Largely thrown
together on a plane above the Atlantic over the last day, so mostly
untested, but a lot of it is fairly simply switching to using 'struct
device' instead of assuming 'struct pci_dev' everywhere.

For now I've taken the simple approach of using the ->devices array, and
*expanding* it to contain the bus+devfn to use for ACPI devices too.


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