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34a255e676
Most of the callers of vfio_pin_pages() want "struct page *" and the low-level mm code to pin pages returns a list of "struct page *" too. So there's no gain in converting "struct page *" to PFN in between. Replace the output parameter "phys_pfn" list with a "pages" list, to simplify callers. This also allows us to replace the vfio_iommu_type1 implementation with a more efficient one. And drop the pfn_valid check in the gvt code, as there is no need to do such a check at a page-backed struct page pointer. For now, also update vfio_iommu_type1 to fit this new parameter too. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Eric Farman <farman@linux.ibm.com> Tested-by: Terrence Xu <terrence.xu@intel.com> Tested-by: Eric Farman <farman@linux.ibm.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Link: https://lore.kernel.org/r/20220723020256.30081-11-nicolinc@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*/
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enum vfio_group_type {
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/*
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* Physical device with IOMMU backing.
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*/
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VFIO_IOMMU,
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/*
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* Virtual device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. The user of these devices must not be able to
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* directly trigger unmediated DMA.
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*/
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VFIO_EMULATED_IOMMU,
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/*
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* Physical device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. Users can trigger unmediated DMA by the device,
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* usage is highly dangerous, requires an explicit opt-in and will
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* taint the kernel.
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*/
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VFIO_NO_IOMMU,
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};
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/* events for the backend driver notify callback */
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enum vfio_iommu_notify_type {
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VFIO_IOMMU_CONTAINER_CLOSE = 0,
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};
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/**
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* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
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*/
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struct vfio_iommu_driver_ops {
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char *name;
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struct module *owner;
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void *(*open)(unsigned long arg);
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void (*release)(void *iommu_data);
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long (*ioctl)(void *iommu_data, unsigned int cmd,
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unsigned long arg);
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int (*attach_group)(void *iommu_data,
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struct iommu_group *group,
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enum vfio_group_type);
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void (*detach_group)(void *iommu_data,
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struct iommu_group *group);
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int (*pin_pages)(void *iommu_data,
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struct iommu_group *group,
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dma_addr_t user_iova,
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int npage, int prot,
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struct page **pages);
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void (*unpin_pages)(void *iommu_data,
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dma_addr_t user_iova, int npage);
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void (*register_device)(void *iommu_data,
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struct vfio_device *vdev);
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void (*unregister_device)(void *iommu_data,
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struct vfio_device *vdev);
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int (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
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void *data, size_t count, bool write);
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struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
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struct iommu_group *group);
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void (*notify)(void *iommu_data,
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enum vfio_iommu_notify_type event);
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};
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int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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