316 lines
11 KiB
C
316 lines
11 KiB
C
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/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */
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/******************************************************************************
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* gntdev.h
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*
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* Interface to /dev/xen/gntdev.
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*
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* Copyright (c) 2007, D G Murray
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* Copyright (c) 2018, Oleksandr Andrushchenko, EPAM Systems Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __LINUX_PUBLIC_GNTDEV_H__
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#define __LINUX_PUBLIC_GNTDEV_H__
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#include <linux/types.h>
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struct ioctl_gntdev_grant_ref {
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/* The domain ID of the grant to be mapped. */
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__u32 domid;
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/* The grant reference of the grant to be mapped. */
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__u32 ref;
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};
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/*
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* Inserts the grant references into the mapping table of an instance
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* of gntdev. N.B. This does not perform the mapping, which is deferred
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* until mmap() is called with @index as the offset. @index should be
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* considered opaque to userspace, with one exception: if no grant
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* references have ever been inserted into the mapping table of this
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* instance, @index will be set to 0. This is necessary to use gntdev
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* with userspace APIs that expect a file descriptor that can be
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* mmap()'d at offset 0, such as Wayland. If @count is set to 0, this
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* ioctl will fail.
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*/
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#define IOCTL_GNTDEV_MAP_GRANT_REF \
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_IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
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struct ioctl_gntdev_map_grant_ref {
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/* IN parameters */
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/* The number of grants to be mapped. */
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__u32 count;
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__u32 pad;
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/* OUT parameters */
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/* The offset to be used on a subsequent call to mmap(). */
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__u64 index;
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/* Variable IN parameter. */
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/* Array of grant references, of size @count. */
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struct ioctl_gntdev_grant_ref refs[1];
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};
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/*
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* Removes the grant references from the mapping table of an instance of
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* gntdev. N.B. munmap() must be called on the relevant virtual address(es)
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* before this ioctl is called, or an error will result.
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*/
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#define IOCTL_GNTDEV_UNMAP_GRANT_REF \
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_IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
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struct ioctl_gntdev_unmap_grant_ref {
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/* IN parameters */
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/* The offset was returned by the corresponding map operation. */
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__u64 index;
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/* The number of pages to be unmapped. */
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__u32 count;
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__u32 pad;
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};
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/*
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* Returns the offset in the driver's address space that corresponds
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* to @vaddr. This can be used to perform a munmap(), followed by an
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* UNMAP_GRANT_REF ioctl, where no state about the offset is retained by
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* the caller. The number of pages that were allocated at the same time as
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* @vaddr is returned in @count.
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*
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* N.B. Where more than one page has been mapped into a contiguous range, the
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* supplied @vaddr must correspond to the start of the range; otherwise
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* an error will result. It is only possible to munmap() the entire
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* contiguously-allocated range at once, and not any subrange thereof.
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*/
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#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \
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_IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
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struct ioctl_gntdev_get_offset_for_vaddr {
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/* IN parameters */
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/* The virtual address of the first mapped page in a range. */
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__u64 vaddr;
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/* OUT parameters */
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/* The offset that was used in the initial mmap() operation. */
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__u64 offset;
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/* The number of pages mapped in the VM area that begins at @vaddr. */
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__u32 count;
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__u32 pad;
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};
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/*
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* Sets the maximum number of grants that may mapped at once by this gntdev
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* instance.
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*
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* N.B. This must be called before any other ioctl is performed on the device.
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*/
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#define IOCTL_GNTDEV_SET_MAX_GRANTS \
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_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
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struct ioctl_gntdev_set_max_grants {
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/* IN parameter */
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/* The maximum number of grants that may be mapped at once. */
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__u32 count;
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};
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/*
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* Sets up an unmap notification within the page, so that the other side can do
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* cleanup if this side crashes. Required to implement cross-domain robust
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* mutexes or close notification on communication channels.
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*
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* Each mapped page only supports one notification; multiple calls referring to
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* the same page overwrite the previous notification. You must clear the
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* notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
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* to occur.
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*/
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#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \
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_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
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struct ioctl_gntdev_unmap_notify {
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/* IN parameters */
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/* Offset in the file descriptor for a byte within the page (same as
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* used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
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* be cleared. Otherwise, it can be any byte in the page whose
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* notification we are adjusting.
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*/
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__u64 index;
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/* Action(s) to take on unmap */
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__u32 action;
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/* Event channel to notify */
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__u32 event_channel_port;
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};
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struct gntdev_grant_copy_segment {
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union {
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void __user *virt;
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struct {
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grant_ref_t ref;
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__u16 offset;
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domid_t domid;
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} foreign;
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} source, dest;
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__u16 len;
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__u16 flags; /* GNTCOPY_* */
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__s16 status; /* GNTST_* */
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};
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/*
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* Copy between grant references and local buffers.
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*
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* The copy is split into @count @segments, each of which can copy
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* to/from one grant reference.
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*
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* Each segment is similar to struct gnttab_copy in the hypervisor ABI
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* except the local buffer is specified using a virtual address
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* (instead of a GFN and offset).
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*
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* The local buffer may cross a Xen page boundary -- the driver will
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* split segments into multiple ops if required.
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*
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* Returns 0 if all segments have been processed and @status in each
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* segment is valid. Note that one or more segments may have failed
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* (status != GNTST_okay).
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*
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* If the driver had to split a segment into two or more ops, @status
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* includes the status of the first failed op for that segment (or
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* GNTST_okay if all ops were successful).
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*
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* If -1 is returned, the status of all segments is undefined.
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*
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* EINVAL: A segment has local buffers for both source and
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* destination.
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* EINVAL: A segment crosses the boundary of a foreign page.
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* EFAULT: A segment's local buffer is not accessible.
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*/
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#define IOCTL_GNTDEV_GRANT_COPY \
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_IOC(_IOC_NONE, 'G', 8, sizeof(struct ioctl_gntdev_grant_copy))
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struct ioctl_gntdev_grant_copy {
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unsigned int count;
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struct gntdev_grant_copy_segment __user *segments;
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};
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/* Clear (set to zero) the byte specified by index */
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#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
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/* Send an interrupt on the indicated event channel */
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#define UNMAP_NOTIFY_SEND_EVENT 0x2
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/*
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* Flags to be used while requesting memory mapping's backing storage
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* to be allocated with DMA API.
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*/
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/*
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* The buffer is backed with memory allocated with dma_alloc_wc.
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*/
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#define GNTDEV_DMA_FLAG_WC (1 << 0)
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/*
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* The buffer is backed with memory allocated with dma_alloc_coherent.
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*/
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#define GNTDEV_DMA_FLAG_COHERENT (1 << 1)
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/*
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* Create a dma-buf [1] from grant references @refs of count @count provided
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* by the foreign domain @domid with flags @flags.
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*
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* By default dma-buf is backed by system memory pages, but by providing
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* one of the GNTDEV_DMA_FLAG_XXX flags it can also be created as
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* a DMA write-combine or coherent buffer, e.g. allocated with dma_alloc_wc/
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* dma_alloc_coherent.
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*
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* Returns 0 if dma-buf was successfully created and the corresponding
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* dma-buf's file descriptor is returned in @fd.
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*
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* [1] Documentation/driver-api/dma-buf.rst
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*/
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#define IOCTL_GNTDEV_DMABUF_EXP_FROM_REFS \
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_IOC(_IOC_NONE, 'G', 9, \
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sizeof(struct ioctl_gntdev_dmabuf_exp_from_refs))
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struct ioctl_gntdev_dmabuf_exp_from_refs {
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/* IN parameters. */
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/* Specific options for this dma-buf: see GNTDEV_DMA_FLAG_XXX. */
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__u32 flags;
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/* Number of grant references in @refs array. */
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__u32 count;
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/* OUT parameters. */
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/* File descriptor of the dma-buf. */
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__u32 fd;
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/* The domain ID of the grant references to be mapped. */
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__u32 domid;
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/* Variable IN parameter. */
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/* Array of grant references of size @count. */
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__u32 refs[1];
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};
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/*
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* This will block until the dma-buf with the file descriptor @fd is
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* released. This is only valid for buffers created with
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* IOCTL_GNTDEV_DMABUF_EXP_FROM_REFS.
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*
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* If within @wait_to_ms milliseconds the buffer is not released
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* then -ETIMEDOUT error is returned.
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* If the buffer with the file descriptor @fd does not exist or has already
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* been released, then -ENOENT is returned. For valid file descriptors
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* this must not be treated as error.
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*/
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#define IOCTL_GNTDEV_DMABUF_EXP_WAIT_RELEASED \
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_IOC(_IOC_NONE, 'G', 10, \
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sizeof(struct ioctl_gntdev_dmabuf_exp_wait_released))
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struct ioctl_gntdev_dmabuf_exp_wait_released {
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/* IN parameters */
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__u32 fd;
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__u32 wait_to_ms;
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};
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/*
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* Import a dma-buf with file descriptor @fd and export granted references
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* to the pages of that dma-buf into array @refs of size @count.
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*/
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#define IOCTL_GNTDEV_DMABUF_IMP_TO_REFS \
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_IOC(_IOC_NONE, 'G', 11, \
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sizeof(struct ioctl_gntdev_dmabuf_imp_to_refs))
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struct ioctl_gntdev_dmabuf_imp_to_refs {
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/* IN parameters. */
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/* File descriptor of the dma-buf. */
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__u32 fd;
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/* Number of grant references in @refs array. */
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__u32 count;
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/* The domain ID for which references to be granted. */
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__u32 domid;
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/* Reserved - must be zero. */
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__u32 reserved;
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/* OUT parameters. */
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/* Array of grant references of size @count. */
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__u32 refs[1];
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};
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/*
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* This will close all references to the imported buffer with file descriptor
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* @fd, so it can be released by the owner. This is only valid for buffers
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* created with IOCTL_GNTDEV_DMABUF_IMP_TO_REFS.
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*/
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#define IOCTL_GNTDEV_DMABUF_IMP_RELEASE \
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_IOC(_IOC_NONE, 'G', 12, \
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sizeof(struct ioctl_gntdev_dmabuf_imp_release))
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struct ioctl_gntdev_dmabuf_imp_release {
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/* IN parameters */
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__u32 fd;
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__u32 reserved;
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};
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#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
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