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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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f4b20bb34c
Provide a mock kernel module for the iommu_domain that allows it to run without any HW and the mocking provides a way to directly validate that the PFNs loaded into the iommu_domain are correct. This exposes the access kAPI toward userspace to allow userspace to explore the functionality of pages.c and io_pagetable.c The mock also simulates the rare case of PAGE_SIZE > iommu page size as the mock will operate at a 2K iommu page size. This allows exercising all of the calculations to support this mismatch. This is also intended to support syzkaller exploring the same space. However, it is an unusually invasive config option to enable all of this. The config option should not be enabled in a production kernel. Link: https://lore.kernel.org/r/16-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> # s390 Tested-by: Eric Auger <eric.auger@redhat.com> # aarch64 Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Intel Corporation
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* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*/
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#ifndef __LINUX_IOMMUFD_H
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#define __LINUX_IOMMUFD_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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struct device;
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struct iommufd_device;
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struct page;
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struct iommufd_ctx;
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struct iommufd_access;
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struct file;
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struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
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struct device *dev, u32 *id);
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void iommufd_device_unbind(struct iommufd_device *idev);
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int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id);
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void iommufd_device_detach(struct iommufd_device *idev);
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struct iommufd_access_ops {
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u8 needs_pin_pages : 1;
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void (*unmap)(void *data, unsigned long iova, unsigned long length);
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};
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enum {
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IOMMUFD_ACCESS_RW_READ = 0,
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IOMMUFD_ACCESS_RW_WRITE = 1 << 0,
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/* Set if the caller is in a kthread then rw will use kthread_use_mm() */
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IOMMUFD_ACCESS_RW_KTHREAD = 1 << 1,
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/* Only for use by selftest */
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__IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2,
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};
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struct iommufd_access *
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iommufd_access_create(struct iommufd_ctx *ictx, u32 ioas_id,
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const struct iommufd_access_ops *ops, void *data);
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void iommufd_access_destroy(struct iommufd_access *access);
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void iommufd_ctx_get(struct iommufd_ctx *ictx);
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#if IS_ENABLED(CONFIG_IOMMUFD)
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struct iommufd_ctx *iommufd_ctx_from_file(struct file *file);
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void iommufd_ctx_put(struct iommufd_ctx *ictx);
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int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova,
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unsigned long length, struct page **out_pages,
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unsigned int flags);
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void iommufd_access_unpin_pages(struct iommufd_access *access,
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unsigned long iova, unsigned long length);
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int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
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void *data, size_t len, unsigned int flags);
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int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx, u32 *out_ioas_id);
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#else /* !CONFIG_IOMMUFD */
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static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline void iommufd_ctx_put(struct iommufd_ctx *ictx)
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{
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}
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static inline int iommufd_access_pin_pages(struct iommufd_access *access,
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unsigned long iova,
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unsigned long length,
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struct page **out_pages,
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unsigned int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline void iommufd_access_unpin_pages(struct iommufd_access *access,
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unsigned long iova,
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unsigned long length)
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{
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}
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static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
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void *data, size_t len, unsigned int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx,
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u32 *out_ioas_id)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_IOMMUFD */
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#endif
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