[0/2] Add support to enable ATS on VFs independently.

Message

Ganapatrao Kulkarni Feb. 27, 2023, 1:21 p.m. UTC

As discussed in [1], adding a helper function to configure the STU of an
ATS capability. Function pci_ats_stu_configure() can be called to program
the STU while enumerating the PF, to support scenarios like PF is not
enabled with ATS, whereas VFs can enable it.

In SMMU-V3 driver, calling pci_ats_stu_configure() to confgiure the STU
while enumerating a PF in passthrough mode.


[1] https://lore.kernel.org/linux-arm-kernel/20230221154624.GA3701506@bhelgaas/T/


Ganapatrao Kulkarni (2):
  PCI/ATS: Add a helper function to configure ATS STU of a PF.
  iommu/arm-smmu-v3: Configure STU of a PF if ATS is not enabled.

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 25 +++++++++++++++-
 drivers/pci/ats.c                           | 32 +++++++++++++++++++--
 include/linux/pci-ats.h                     |  1 +
 3 files changed, 55 insertions(+), 3 deletions(-)