From: David Woodhouse <dwmw2@infradead.org>
To: Jacek Lawrynowicz <jacek.lawrynowicz@intel.com>,
linux-pci@vger.kernel.org
Cc: bhelgaas@google.com, alex.williamson@redhat.com, jroedel@suse.de
Subject: Re: [PATCH v2 1/2] pci: Add support for multiple DMA aliases
Date: Tue, 26 Jan 2016 15:07:03 +0000 [thread overview]
Message-ID: <1453820823.60902.69.camel@infradead.org> (raw)
In-Reply-To: <1453819940-100605-1-git-send-email-jacek.lawrynowicz@intel.com>
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On Tue, 2016-01-26 at 15:52 +0100, Jacek Lawrynowicz wrote:
> This patch solves IOMMU support issues with PCIe non-transparent bridges
> that use Requester ID look-up tables (LUT), e.g. PEX8733. Before exiting
> the bridge, packet's RID is rewritten according to LUT programmed by
> a driver. Modified packets are then passed to a destination bus and
> processed upstream. The problem is that such packets seem to come from
> non-existent nodes that are hidden behind NTB and are not discoverable
> by a destination node, so IOMMU discards them. Adding DMA alias for a
> given LUT entry allows IOMMU to create a proper mapping that enables
> inter-node communication.
>
> The current DMA alias implementation supports only single alias, so it's
> not possible to connect more than two nodes when IOMMU is enabled. This
> implementation enables all possible aliases on a given bus (256) that
> are stored in a bitset. Alias devfn is directly translated to a bit
> number. The bitset is not allocated for devices that have no need for
> DMA aliases.
>
> More details can be found in following article:
> http://www.plxtech.com/files/pdf/technical/expresslane/RTC_Enabling%20MulitHostSystemDesigns.pdf
>
> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@intel.com>
Acked-By: David Woodhouse <David.Woodhouse@intel.com>
... for both.
--
dwmw2
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next prev parent reply other threads:[~2016-01-26 15:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-26 10:31 [PATCH v2 1/2] pci: Add support for multiple DMA aliases Jacek Lawrynowicz
2016-01-26 10:31 ` [PATCH v2 2/2] pci: Add DMA alias quirk for mic_x200_dma Jacek Lawrynowicz
2016-01-26 16:28 ` Alex Williamson
2016-01-26 17:20 ` Lawrynowicz, Jacek
2016-01-26 17:24 ` Jacek Lawrynowicz
2016-01-26 11:59 ` [PATCH v2 1/2] pci: Add support for multiple DMA aliases David Woodhouse
2016-01-26 12:04 ` Lawrynowicz, Jacek
2016-01-26 12:27 ` David Woodhouse
2016-01-26 14:34 ` Bjorn Helgaas
2016-01-26 14:52 ` Jacek Lawrynowicz
2016-01-26 15:07 ` David Woodhouse [this message]
2016-01-26 16:27 ` Alex Williamson
2016-01-26 17:12 ` Jacek Lawrynowicz
2016-01-26 23:31 ` Bjorn Helgaas
2016-01-26 23:42 ` Alex Williamson
2016-01-27 0:04 ` Bjorn Helgaas
2016-01-27 0:54 ` Alex Williamson
2016-01-27 20:05 ` Lawrynowicz, Jacek
2016-01-27 20:25 ` Alex Williamson
2016-01-30 11:06 ` [PATCH v3 0/2] Fixed couple of issues pointed by Alex and Bjorn Jacek Lawrynowicz
2016-01-30 11:06 ` [PATCH v3 1/2] pci: Add support for multiple DMA aliases Jacek Lawrynowicz
2016-02-15 17:22 ` Joerg Roedel
2016-01-30 11:06 ` [PATCH v3 2/2] pci: Add DMA alias quirk for mic_x200_dma Jacek Lawrynowicz
2016-01-27 20:01 ` [PATCH v2 1/2] pci: Add support for multiple DMA aliases Lawrynowicz, Jacek
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