linux-kernel - [PATCH 0/3] AMD IOMMU Changes for NTB

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Date:   Tue,  8 Oct 2019 16:18:34 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Joerg Roedel <joro@...tes.org>
Cc:     Kit Chow <kchow@...aio.com>, Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 0/3] AMD IOMMU Changes for NTB

Hi,

Please find the following patches which help support
Non-Transparent-Bridge (NTB) devices on AMD platforms with the IOMMU
enabled.

The first patch implements dma_map_resource() correctly with the AMD
IOMMU. This is required for correct functioning of ntb_transport which
uses that interface.

The second two patches add support for multiple PCI aliases. NTB
hardware will normally send TLPs from a range of requestor IDs to
facilitate routing the responses back to the correct requestor on the
other side of the bridge. To support this, NTB hardware registers a
number of PCI aliases. Currently the AMD IOMMU only allows for one
PCI alias so TLPs from the other aliases get rejected.

See commit ad281ecf1c7d ("PCI: Add DMA alias quirk for Microsemi
Switchtec NTB") for more information on this.

Similar patches were upstreamed for Intel hardware earlier this year:

commit 21d5d27c042d ("iommu/vt-d: Implement dma_[un]map_resource()")
commit 3f0c625c6ae7 ("iommu/vt-d: Allow interrupts from the entire bus
    for aliased devices")

Thanks,

Logan

--

Kit Chow (1):
  iommu/amd: Implement dma_[un]map_resource()

Logan Gunthorpe (2):
  iommu/amd: Support multiple PCI DMA aliases in device table
  iommu/amd: Support multiple PCI DMA aliases in IRQ Remapping

 drivers/iommu/amd_iommu.c       | 198 +++++++++++++++++++-------------
 drivers/iommu/amd_iommu_types.h |   2 +-
 2 files changed, 120 insertions(+), 80 deletions(-)

--
2.20.1