From: Joerg Roedel <joro@8bytes.org>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org,
bhelgaas@google.com, acooks@gmail.com,
linux-kernel@vger.kernel.org, linux@horizon.com
Subject: Re: [PATCH v3 08/15] iommu/amd: Use pci_find_dma_isolation_root() for IOMMU groups
Date: Wed, 14 May 2014 12:34:50 +0200 [thread overview]
Message-ID: <20140514103449.GE6026@8bytes.org> (raw)
In-Reply-To: <20140510150311.2997.62903.stgit@bling.home>
On Sat, May 10, 2014 at 09:03:11AM -0600, Alex Williamson wrote:
> The expectation is that the kernel and IVRS will produce the same
> result for topology based aliases while the kernel will also include
> device specific DMA quirks.
Is that expectation really true? There are PCIe devices out there that
don't use their own device-id for requests but another one that isn't
even visible as a PCI device (so the kernel has no pci_dev structure for
it). The IVRS table contains such information, but I am not sure whether
the PCI core finds the right requestor-id for those devices.
I've seen this on PCIe cards that where the vendor just used an PCI-X
chip with a PCIe-to-PCI-X bridge on the card. The PCI-X device is
visible for the OS but uses the requestor-id of the invisible bridge.
Joerg
next prev parent reply other threads:[~2014-05-14 10:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-10 15:02 [PATCH v3 00/15] PCI/iommu: Fix DMA alias problems Alex Williamson
[not found] ` <20140510145619.2997.429.stgit-xdHQ/5r00wBBDLzU/O5InQ@public.gmane.org>
2014-05-10 15:02 ` [PATCH v3 01/15] PCI: Add DMA alias iterator Alex Williamson
2014-05-10 15:02 ` [PATCH v3 02/15] PCI: quirk pci_for_each_dma_alias() Alex Williamson
2014-05-10 15:02 ` [PATCH v3 03/15] PCI: quirk dma_func_alias for Ricoh devices Alex Williamson
2014-05-10 15:02 ` [PATCH v3 04/15] PCI: quirk dma_func_alias for Marvell devices Alex Williamson
2014-05-10 15:02 ` [PATCH v3 05/15] PCI: Quirk pci_for_each_dma_alias() for bridges Alex Williamson
2014-05-10 15:02 ` [PATCH v3 06/15] PCI: Add quirks for ASMedia and Tundra bridges Alex Williamson
2014-05-10 15:03 ` [PATCH v3 07/15] PCI: Consolidate isolation domain code Alex Williamson
2014-05-10 15:03 ` [PATCH v3 08/15] iommu/amd: Use pci_find_dma_isolation_root() for IOMMU groups Alex Williamson
2014-05-14 10:34 ` Joerg Roedel [this message]
[not found] ` <20140514103449.GE6026-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2014-05-14 14:27 ` Alex Williamson
2014-05-10 15:03 ` [PATCH v3 09/15] iommu/amd: Update to use PCI DMA aliases Alex Williamson
2014-05-10 15:03 ` [PATCH v3 10/15] iommu/intel: Use pci_find_dma_isolation_root() for IOMMU groups Alex Williamson
2014-05-10 15:03 ` [PATCH v3 11/15] iommu/intel: Update to use PCI DMA aliases Alex Williamson
2014-05-10 15:03 ` [PATCH v3 12/15] iommu/fsl: Use pci_find_dma_isolation_root() for IOMMU groups Alex Williamson
2014-05-10 15:03 ` [PATCH v3 13/15] iommu: Remove pci.h Alex Williamson
2014-05-10 15:03 ` [PATCH v3 14/15] PCI: Remove pci_find_upstream_pcie_bridge() Alex Williamson
2014-05-10 15:03 ` [PATCH v3 15/15] PCI: Remove pci_get_dma_source() Alex Williamson
2014-05-10 16:51 ` [PATCH v3 00/15] PCI/iommu: Fix DMA alias problems George Spelvin
[not found] ` <1400020520427-859747.post@n7.nabble.com>
[not found] ` <1400020520427-859747.post-hbTxXoYVu7Vl57MIdRCFDg@public.gmane.org>
2014-05-14 17:18 ` Alex Williamson
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