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Message-Id: <20230227132151.1907480-1-gankulkarni@os.amperecomputing.com>
Date: Mon, 27 Feb 2023 05:21:49 -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, darren@...amperecomputing.com,
scott@...amperecomputing.com, gankulkarni@...amperecomputing.com
Subject: [PATCH 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/
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(-)
--
2.38.1
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