linux-kernel - [PATCH v2 0/2] Add support to enable ATS on VFs independently

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Message-Id: <20230228042137.1941024-1-gankulkarni@os.amperecomputing.com>
Date:   Mon, 27 Feb 2023 20:21:35 -0800
From:   Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        joro@...tes.org, bhelgaas@...gle.com, robin.murphy@....com,
        will@...nel.org
Cc:     jean-philippe@...aro.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        darren@...amperecomputing.com, scott@...amperecomputing.com,
        gankulkarni@...amperecomputing.com
Subject: [PATCH v2 0/2] Add support to enable ATS on VFs independently

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/

v2:
	- Added dummy definition for pci_ats_stu_configure.
	- Changed STU configure to read modify write.

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                           | 33 +++++++++++++++++++--
 include/linux/pci-ats.h                     |  3 ++
 3 files changed, 58 insertions(+), 3 deletions(-)

-- 
2.38.1