linux-kernel - Re: [PATCH v2] PCI: Reset PCIe devices to stop ongoing DMA

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Message-ID: <CAErSpo4yJ2yqCWv7GT7jWSVd_8SktU=xJXT78m8Vxp_wLA4Fow@mail.gmail.com>
Date:	Wed, 31 Jul 2013 15:08:03 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Takao Indoh <indou.takao@...fujitsu.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux-foundation.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"ishii.hironobu@...fujitsu.com" <ishii.hironobu@...fujitsu.com>,
	Don Dutile <ddutile@...hat.com>,
	"Sumner, William" <bill.sumner@...com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v2] PCI: Reset PCIe devices to stop ongoing DMA

[+cc Rafael, linux-acpi]

On Tue, Jul 30, 2013 at 6:35 PM, Takao Indoh <indou.takao@...fujitsu.com> wrote:

> On x86, currently IOMMU initialization run *after* PCI enumeration, but
> what you are talking about is that it should be changed so that x86
> IOMMU initialization is done *before* PCI enumeration like sparc, right?

Yes.  I don't know whether or when that initialization order will ever
be changed, but I do think we should avoid building more
infrastructure that depends on the current order.

Changing the order is a pretty big deal because it's a lot more than
just the IOMMU.  Basically I think we should be enumerating ACPI
devices, including the IOMMU, before PCI devices, but there's a lot of
legacy involved in that area.  Added Rafael in case he has any
thoughts.

> Hmm, ok, I think I need to post attached patch to iommu list and
> discuss it including current order of x86 IOMMU initialization.
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