linux-kernel - Re: [Patch Part3 V4 16/21] iommu/vt-d: Implement DMAR unit hotplug framework

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Date:	Wed, 23 Jul 2014 17:34:21 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	David Woodhouse <dwmw2@...radead.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>,
	Ashok Raj <ashok.raj@...el.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org
Subject: Re: [Patch Part3 V4 16/21] iommu/vt-d: Implement DMAR unit hotplug
 framework

On Fri, Jul 11, 2014 at 02:19:40PM +0800, Jiang Liu wrote:
> On Intel platforms, an IO Hub (PCI/PCIe host bridge) may contain DMAR
> units, so we need to support DMAR hotplug when supporting PCI host
> bridge hotplug on Intel platforms.
> 
> According to Section 8.8 "Remapping Hardware Unit Hot Plug" in "Intel
> Virtualization Technology for Directed IO Architecture Specification
> Rev 2.2", ACPI BIOS should implement ACPI _DSM method under the ACPI
> object for the PCI host bridge to support DMAR hotplug.
> 
> This patch introduces interfaces to parse ACPI _DSM method for
> DMAR unit hotplug. It also implements state machines for DMAR unit
> hot-addition and hot-removal.
> 
> The PCI host bridge hotplug driver should call dmar_hotplug_hotplug()
> before scanning PCI devices connected for hot-addition and after
> destroying all PCI devices for hot-removal.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
>  drivers/iommu/dmar.c                |  268 +++++++++++++++++++++++++++++++++--
>  drivers/iommu/intel-iommu.c         |   78 +++++++++-
>  drivers/iommu/intel_irq_remapping.c |    5 +
>  include/linux/dmar.h                |   33 +++++
>  4 files changed, 370 insertions(+), 14 deletions(-)

This patch triggers a compile error with allnoconfig on amd64:

  CC      arch/x86/kernel/pci-dma.o
In file included from arch/x86/kernel/pci-dma.c:3:0:
include/linux/dmar.h:168:35: error: unknown type name ‘acpi_handle’
 static inline int dmar_device_add(acpi_handle handle)
                                   ^
include/linux/dmar.h:173:38: error: unknown type name ‘acpi_handle’
 static inline int dmar_device_remove(acpi_handle handle)
                                      ^
make[2]: *** [arch/x86/kernel/pci-dma.o] Error 1
make[1]: *** [arch/x86/kernel] Error 2
make: *** [arch/x86] Error 2

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