linux-kernel - Re: [Patch Part2 V2 15/17] iommu/vt-d, PCI: update DRHD/RMRR/ATSR device scope caches when PCI hotplug happens

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Message-ID: <1394456660.2270.3.camel@shinybook.infradead.org>
Date:	Mon, 10 Mar 2014 06:04:20 -0700
From:	David Woodhouse <dwmw2@...radead.org>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Joerg Roedel <joro@...tes.org>, Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	iommu@...ts.linux-foundation.org
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
http://git.infradead.org/users/dwmw2/linux-andd.git

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.

-- 
dwmw2


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