64 l4( (  fB- 0   0   0   0  0 m_I|+)/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */ /****************************************************************************** * gntdev.h * * Interface to /dev/xen/gntdev. * * Copyright (c) 2007, D G Murray * Copyright (c) 2018, Oleksandr Andrushchenko, EPAM Systems Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #ifndef __LINUX_PUBLIC_GNTDEV_H__ #define __LINUX_PUBLIC_GNTDEV_H__ #include struct ioctl_gntdev_grant_ref { /* The domain ID of the grant to be mapped. */ __u32 domid; /* The grant reference of the grant to be mapped. */ __u32 ref; }; /* * Inserts the grant references into the mapping table of an instance * of gntdev. N.B. This does not perform the mapping, which is deferred * until mmap() is called with @index as the offset. */ #define IOCTL_GNTDEV_MAP_GRANT_REF \ _IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref)) struct ioctl_gntdev_map_grant_ref { /* IN parameters */ /* The number of grants to be mapped. */ __u32 count; __u32 pad; /* OUT parameters */ /* The offset to be used on a subsequent call to mmap(). */ __u64 index; /* Variable IN parameter. */ /* Array of grant references, of size @count. */ struct ioctl_gntdev_grant_ref refs[1]; }; /* * Removes the grant references from the mapping table of an instance of * gntdev. N.B. munmap() must be called on the relevant virtual address(es) * before this ioctl is called, or an error will result. */ #define IOCTL_GNTDEV_UNMAP_GRANT_REF \ _IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref)) struct ioctl_gntdev_unmap_grant_ref { /* IN parameters */ /* The offset was returned by the corresponding map operation. */ __u64 index; /* The number of pages to be unmapped. */ __u32 count; __u32 pad; }; /* * Returns the offset in the driver's address space that corresponds * to @vaddr. This can be used to perform a munmap(), followed by an * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by * the caller. The number of pages that were allocated at the same time as * @vaddr is returned in @count. * * N.B. Where more than one page has been mapped into a contiguous range, the * supplied @vaddr must correspond to the start of the range; otherwise * an error will result. It is only possible to munmap() the entire * contiguously-allocated range at once, and not any subrange thereof. */ #define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \ _IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr)) struct ioctl_gntdev_get_offset_for_vaddr { /* IN paramet