linux-kernel - [PATCH v2 0/2] AMD IOMMU Changes for NTB

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Date:   Tue, 22 Oct 2019 16:01:19 -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 v2 0/2]  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.

These 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 3f0c625c6ae7 ("iommu/vt-d: Allow interrupts from the entire bus
    for aliased devices")

Thanks,

Logan

--

Changes since v1:
  * Dropped the first patch as similar functionality has already
    been added with the generic iommu interface
  * Rebased onto joro/iommu.git next branch
  * Reworked the set_remap_table_entry_alias() function to also do
    the flushing by getting the iommu from amd_iommu_rlookup_table
    (per suggestion from Joerg)

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       | 170 +++++++++++++++++---------------
 drivers/iommu/amd_iommu_types.h |   2 +-
 2 files changed, 92 insertions(+), 80 deletions(-)

--
2.20.1