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Message-ID: <cover.1724777091.git.nicolinc@nvidia.com>
Date: Tue, 27 Aug 2024 10:02:02 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>
Subject: [PATCH v1 00/10] iommufd: Add VIOMMU infrastructure (Part-2 VIRQ)
As the part-2 of the VIOMMU infrastructure, this series introduces a VIRQ
object after repurposing the existing FAULT object, which provides a nice
notification pathway to the user space already. So, the first thing to do
is reworking the FAULT object.
Mimicing the HWPT structures, add a common EVENT structure to support its
derivatives: EVENT_IOPF (the prior FAULT object) and EVENT_VIRQ (new one).
IOMMUFD_CMD_VIRQ_ALLOC is introduced to allocate EVENT_VIRQ for a VIOMMU.
One VIOMMU can have multiple VIRQs in different types but can not support
multiple VIRQs with the same types.
Drivers might need the VIOMMU's vdev_id list or the exact vdev_id link of
the passthrough device's to forward IRQs/events via the VIOMMU framework.
Thus, extend the set/unset_vdev_id ioctls down to the driver using VIOMMU
ops. This allows drivers to take the control of a vdev_id's lifecycle.
The forwarding part is fairly simple but might need to replace a physical
device ID with a virtual device ID. So, there comes with some helpers for
drivers to use.
As usual, this series comes with the selftest coverage for this new VIRQ,
and with a real world use case in the ARM SMMUv3 driver.
This must be based on the VIOMMU Part-1 series. It's on Github:
https://github.com/nicolinc/iommufd/commits/iommufd_virq-v1
Paring QEMU branch for testing:
https://github.com/nicolinc/qemu/commits/wip/for_iommufd_virq-v1
Thanks!
Nicolin
Nicolin Chen (10):
iommufd: Rename IOMMUFD_OBJ_FAULT to IOMMUFD_OBJ_EVENT_IOPF
iommufd: Rename fault.c to event.c
iommufd: Add IOMMUFD_OBJ_EVENT_VIRQ and IOMMUFD_CMD_VIRQ_ALLOC
iommufd/viommu: Allow drivers to control vdev_id lifecycle
iommufd/viommu: Add iommufd_vdev_id_to_dev helper
iommufd/viommu: Add iommufd_viommu_report_irq helper
iommufd/selftest: Implement mock_viommu_set/unset_vdev_id
iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VIRQ for VIRQ coverage
iommufd/selftest: Add EVENT_VIRQ test coverage
iommu/arm-smmu-v3: Report virtual IRQ for device in user space
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 109 +++-
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 +
drivers/iommu/iommufd/Makefile | 2 +-
drivers/iommu/iommufd/device.c | 2 +
drivers/iommu/iommufd/event.c | 613 ++++++++++++++++++
drivers/iommu/iommufd/fault.c | 443 -------------
drivers/iommu/iommufd/hw_pagetable.c | 12 +-
drivers/iommu/iommufd/iommufd_private.h | 147 ++++-
drivers/iommu/iommufd/iommufd_test.h | 10 +
drivers/iommu/iommufd/main.c | 13 +-
drivers/iommu/iommufd/selftest.c | 66 ++
drivers/iommu/iommufd/viommu.c | 25 +-
drivers/iommu/iommufd/viommu_api.c | 54 ++
include/linux/iommufd.h | 28 +
include/uapi/linux/iommufd.h | 46 ++
tools/testing/selftests/iommu/iommufd.c | 11 +
tools/testing/selftests/iommu/iommufd_utils.h | 64 ++
17 files changed, 1130 insertions(+), 517 deletions(-)
create mode 100644 drivers/iommu/iommufd/event.c
delete mode 100644 drivers/iommu/iommufd/fault.c
--
2.43.0
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