[RFC,0/5] Clean up VMD DMA Map Ops

Message

Jon Derrick Dec. 31, 2019, 8:24 p.m. UTC

Inspired by Christoph's last set:
https://lkml.org/lkml/2019/8/28/667

VMD currently works with VT-d enabled by pointing DMA and IOMMU actions at the
VMD endpoint. The problem with this approach is that the VMD endpoint's
device-specific attributes, such as the dma mask, are used instead.

This set cleans up VMD by removing the override that redirects dma map
operations to the VMD endpoint. Instead it introduces a new dma alias mechanism
into the existing dma alias infrastructure.

Patch 1 and 2 are miscellaneous fixes discovered during development.
Patch 1 is ready, but 2 likely doesn't go far enough for proper teardown on
addition failure.

Jon Derrick (5):
  iommu: Remove device link to group on failure
  iommu/vt-d: Unlink device if failed to add to group
  x86/PCI: Expose VMD's device in pci_sysdata
  PCI: vmd: Stop overriding dma_map_ops
  x86/PCI: Remove unused X86_DEV_DMA_OPS

 arch/x86/Kconfig               |   3 -
 arch/x86/include/asm/device.h  |  10 ---
 arch/x86/include/asm/pci.h     |   4 +-
 arch/x86/pci/common.c          |  44 ++----------
 drivers/iommu/intel-iommu.c    |  26 ++++---
 drivers/iommu/iommu.c          |   1 +
 drivers/pci/controller/Kconfig |   1 -
 drivers/pci/controller/vmd.c   | 152 +----------------------------------------
 drivers/pci/pci.c              |   4 +-
 drivers/pci/search.c           |   6 ++
 include/linux/pci.h            |   1 +
 11 files changed, 37 insertions(+), 215 deletions(-)

Comments

Joerg Roedel Jan. 7, 2020, 1:41 p.m. UTC | #1

On Tue, Dec 31, 2019 at 01:24:18PM -0700, Jon Derrick wrote:
> Jon Derrick (5):
>   iommu: Remove device link to group on failure
>   iommu/vt-d: Unlink device if failed to add to group

Added 'Fixes:' tags to these two and applied them for v5.5, thanks.