mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 06:18:54 +00:00
48552153cf
Two significant new items:
- Allow reporting IOMMU HW events to userspace when the events are clearly
linked to a device. This is linked to the VIOMMU object and is intended to
be used by a VMM to forward HW events to the virtual machine as part of
emulating a vIOMMU. ARM SMMUv3 is the first driver to use this
mechanism. Like the existing fault events the data is delivered through
a simple FD returning event records on read().
- PASID support in VFIO. "Process Address Space ID" is a PCI feature that
allows the device to tag all PCI DMA operations with an ID. The IOMMU
will then use the ID to select a unique translation for those DMAs. This
is part of Intel's vIOMMU support as VT-D HW requires the hypervisor to
manage each PASID entry. The support is generic so any VFIO user could
attach any translation to a PASID, and the support should work on ARM
SMMUv3 as well. AMD requires additional driver work.
Some minor updates, along with fixes:
- Prevent using nested parents with fault's, no driver support today
- Put a single "cookie_type" value in the iommu_domain to indicate what
owns the various opaque owner fields
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Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd
Pull iommufd updates from Jason Gunthorpe:
"Two significant new items:
- Allow reporting IOMMU HW events to userspace when the events are
clearly linked to a device.
This is linked to the VIOMMU object and is intended to be used by a
VMM to forward HW events to the virtual machine as part of
emulating a vIOMMU. ARM SMMUv3 is the first driver to use this
mechanism. Like the existing fault events the data is delivered
through a simple FD returning event records on read().
- PASID support in VFIO.
The "Process Address Space ID" is a PCI feature that allows the
device to tag all PCI DMA operations with an ID. The IOMMU will
then use the ID to select a unique translation for those DMAs. This
is part of Intel's vIOMMU support as VT-D HW requires the
hypervisor to manage each PASID entry.
The support is generic so any VFIO user could attach any
translation to a PASID, and the support should work on ARM SMMUv3
as well. AMD requires additional driver work.
Some minor updates, along with fixes:
- Prevent using nested parents with fault's, no driver support today
- Put a single "cookie_type" value in the iommu_domain to indicate
what owns the various opaque owner fields"
* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd: (49 commits)
iommufd: Test attach before detaching pasid
iommufd: Fix iommu_vevent_header tables markup
iommu: Convert unreachable() to BUG()
iommufd: Balance veventq->num_events inc/dec
iommufd: Initialize the flags of vevent in iommufd_viommu_report_event()
iommufd/selftest: Add coverage for reporting max_pasid_log2 via IOMMU_HW_INFO
iommufd: Extend IOMMU_GET_HW_INFO to report PASID capability
vfio: VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT support pasid
vfio-iommufd: Support pasid [at|de]tach for physical VFIO devices
ida: Add ida_find_first_range()
iommufd/selftest: Add coverage for iommufd pasid attach/detach
iommufd/selftest: Add test ops to test pasid attach/detach
iommufd/selftest: Add a helper to get test device
iommufd/selftest: Add set_dev_pasid in mock iommu
iommufd: Allow allocating PASID-compatible domain
iommu/vt-d: Add IOMMU_HWPT_ALLOC_PASID support
iommufd: Enforce PASID-compatible domain for RID
iommufd: Support pasid attach/replace
iommufd: Enforce PASID-compatible domain in PASID path
iommufd/device: Add pasid_attach array to track per-PASID attach
...
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.
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*/
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#ifndef __LINUX_IOMMU_PRIV_H
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#define __LINUX_IOMMU_PRIV_H
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#include <linux/iommu.h>
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#include <linux/msi.h>
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static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
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{
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/*
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* Assume that valid ops must be installed if iommu_probe_device()
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* has succeeded. The device ops are essentially for internal use
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* within the IOMMU subsystem itself, so we should be able to trust
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* ourselves not to misuse the helper.
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*/
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return dev->iommu->iommu_dev->ops;
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}
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void dev_iommu_free(struct device *dev);
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const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode);
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static inline const struct iommu_ops *iommu_fwspec_ops(struct iommu_fwspec *fwspec)
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{
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return iommu_ops_from_fwnode(fwspec ? fwspec->iommu_fwnode : NULL);
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}
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void iommu_fwspec_free(struct device *dev);
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int iommu_device_register_bus(struct iommu_device *iommu,
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const struct iommu_ops *ops,
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const struct bus_type *bus,
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struct notifier_block *nb);
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void iommu_device_unregister_bus(struct iommu_device *iommu,
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const struct bus_type *bus,
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struct notifier_block *nb);
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struct iommu_attach_handle *iommu_attach_handle_get(struct iommu_group *group,
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ioasid_t pasid,
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unsigned int type);
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int iommu_attach_group_handle(struct iommu_domain *domain,
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struct iommu_group *group,
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struct iommu_attach_handle *handle);
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void iommu_detach_group_handle(struct iommu_domain *domain,
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struct iommu_group *group);
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int iommu_replace_group_handle(struct iommu_group *group,
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struct iommu_domain *new_domain,
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struct iommu_attach_handle *handle);
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#if IS_ENABLED(CONFIG_IOMMUFD_DRIVER_CORE) && IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
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int iommufd_sw_msi(struct iommu_domain *domain, struct msi_desc *desc,
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phys_addr_t msi_addr);
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#else /* !CONFIG_IOMMUFD_DRIVER_CORE || !CONFIG_IRQ_MSI_IOMMU */
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static inline int iommufd_sw_msi(struct iommu_domain *domain,
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struct msi_desc *desc, phys_addr_t msi_addr)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_IOMMUFD_DRIVER_CORE && CONFIG_IRQ_MSI_IOMMU */
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int iommu_replace_device_pasid(struct iommu_domain *domain,
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struct device *dev, ioasid_t pasid,
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struct iommu_attach_handle *handle);
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#endif /* __LINUX_IOMMU_PRIV_H */
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