/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */
/******************************************************************************
* Interface to /dev/xen/gntdev.
* Copyright (c) 2007, D G Murray
* 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
#ifndef __LINUX_PUBLIC_GNTDEV_H__
#define __LINUX_PUBLIC_GNTDEV_H__
struct ioctl_gntdev_grant_ref {
/* The domain ID of the grant to be mapped. */
/* The grant reference of the grant to be mapped. */
* 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 {
/* The number of grants to be mapped. */
/* The offset to be used on a subsequent call to mmap(). */
/* 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
* 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 {
/* The offset was returned by the corresponding map operation. */
/* The number of pages to be unmapped. */
* 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 {
/* The virtual address of the first mapped page in a range. */
/* The offset that was used in the initial mmap() operation. */
/* The number of pages mapped in the VM area that begins at @vaddr. */
* Sets the maximum number of grants that may mapped at once by this gntdev
* N.B. This must be called before any other ioctl is performed on the device.
#define IOCTL_GNTDEV_SET_MAX_GRANTS \
_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
struct ioctl_gntdev_set_max_grants {
/* The maximum number of grants that may be mapped at once. */
* Sets up an unmap notification within the page, so that the other side can do
* cleanup if this side crashes. Required to implement cross-domain robust
* mutexes or close notification on communication channels.
* Each mapped page only supports one notification; multiple calls referring to
* the same page overwrite the previous notification. You must clear the
* notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \
_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
struct ioctl_gntdev_unmap_notify {
/* Offset in the file descriptor for a byte within the page (same as
* used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
* be cleared. Otherwise, it can be any byte in the page whose
* notification we are adjusting.
/* Action(s) to take on unmap */
/* Event channel to notify */
__u32 event_channel_port;
struct gntdev_grant_copy_segment {
__u16 flags; /* GNTCOPY_* */
__s16 status; /* GNTST_* */
* Copy between grant references and local buffers.
* The copy is split into @count @segments, each of which can copy
* to/from one grant reference.
* Each segment is similar to struct gnttab_copy in the hypervisor ABI
* except the local buffer is specified using a virtual address
* (instead of a GFN and offset).
* The local buffer may cross a Xen page boundary -- the driver will
* split segments into multiple ops if required.
* Returns 0 if all segments have been processed and @status in each
* segment is valid. Note that one or more segments may have failed
* (status != GNTST_okay).
* If the driver had to split a segment into two or more ops, @status
* includes the status of the first failed op for that segment (or
* GNTST_okay if all ops were successful).
* If -1 is returned, the status of all segments is undefined.
* EINVAL: A segment has local buffers for both source and
* EINVAL: A segment crosses the boundary of a foreign page.
* EFAULT: A segment's local buffer is not accessible.
#define IOCTL_GNTDEV_GRANT_COPY \
_IOC(_IOC_NONE, 'G', 8, sizeof(struct ioctl_gntdev_grant_copy))
struct ioctl_gntdev_grant_copy {
struct gntdev_grant_copy_segment *segments;
/* Clear (set to zero) the byte specified by index */
#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
/* Send an interrupt on the indicated event channel */
#define UNMAP_NOTIFY_SEND_EVENT 0x2
#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
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