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Date:	Mon, 15 Sep 2014 15:54:03 +0800
From:	Yijing Wang <>
To:	Jiang Liu <>,
	Joerg Roedel <>,
	David Woodhouse <>,
	Yinghai Lu <>,
	"Bjorn Helgaas" <>,
	Dan Williams <>,
	"Vinod Koul" <>,
	"Rafael J . Wysocki" <>
CC:	Ashok Raj <>, Tony Luck <>,
	<>, <>,
	<>, <>,
Subject: Re: [Patch Part3 V5 0/8] Enable support of Intel DMAR device hotplug

I built and boot this series in Huawei RH5885 (Intel(R) Xeon(R) CPU E7- 4807, two IOHs and two IOMMUs),
It works fine, IRQ remap and DMA remap are both look good.
But because my platform BIOS has no _DSM, so I didn't test the hotplug case yet.


On 2014/9/12 10:10, Jiang Liu wrote:
> When hot plugging a descrete IOH or a physical processor with embedded
> IIO, we need to handle DMAR(or IOMMU) unit in the PCIe host bridge if
> DMAR is in use. This patch set tries to enhance current DMAR/IOMMU/IR
> drivers to support hotplug and is based on latest Linus master branch.
> All prerequisite patches to support DMAR device hotplug have been merged
> into the mainstream kernel, and this is the last patch set to enable
> DMAR device hotplug.
> You may access the patch set at:
> iommu/hotplug_v5
> This patch set has been tested on Intel development machine.
> Appreciate any comments and tests.
> Patch 1-4 enhances DMAR framework to support hotplug
> Patch 5 enhances Intel interrupt remapping driver to support hotplug
> Patch 6 enhances error handling in Intel IR driver
> Patch 7 enhance Intel IOMMU to support hotplug
> Patch 8 enhance ACPI pci_root driver to handle DMAR units
> Jiang Liu (8):
>   iommu/vt-d: Introduce helper function dmar_walk_resources()
>   iommu/vt-d: Dynamically allocate and free seq_id for DMAR units
>   iommu/vt-d: Implement DMAR unit hotplug framework
>   iommu/vt-d: Search for ACPI _DSM method for DMAR hotplug
>   iommu/vt-d: Enhance intel_irq_remapping driver to support DMAR unit
>     hotplug
>   iommu/vt-d: Enhance error recovery in function
>     intel_enable_irq_remapping()
>   iommu/vt-d: Enhance intel-iommu driver to support DMAR unit hotplug
>   pci, ACPI, iommu: Enhance pci_root to support DMAR device hotplug
>  drivers/acpi/pci_root.c             |   16 +-
>  drivers/iommu/dmar.c                |  532 ++++++++++++++++++++++++++++-------
>  drivers/iommu/intel-iommu.c         |  297 ++++++++++++++-----
>  drivers/iommu/intel_irq_remapping.c |  233 +++++++++++----
>  include/linux/dmar.h                |   50 +++-
>  5 files changed, 888 insertions(+), 240 deletions(-)


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