sys/linux/dev_udmabuf.txt

# Copyright 2018 syzkaller project authors. All rights reserved.
# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

include <uapi/linux/udmabuf.h>

resource fd_udambuf[fd]

openat$udambuf(fd const[AT_FDCWD], file ptr[in, string["/dev/udmabuf"]], flags const[O_RDWR]) fd_udambuf
ioctl$UDMABUF_CREATE(fd fd_udambuf, cmd const[UDMABUF_CREATE], arg ptr[in, udmabuf_create])
ioctl$UDMABUF_CREATE_LIST(fd fd_udambuf, cmd const[UDMABUF_CREATE_LIST], arg ptr[in, udmabuf_create_list])

udmabuf_create {
	memfd	fd_memfd
	flags	bool32
	offset	flags[udmabuf_offset_size, int64]
	size	flags[udmabuf_offset_size, int64]
}

udmabuf_create_list {
	flags	bool32
	count	len[list, int32]
	list	array[udmabuf_create_item]
}

udmabuf_create_item {
	memfd	fd_memfd
	__pad	const[0, int32]
	offset	flags[udmabuf_offset_size, int64]
	size	flags[udmabuf_offset_size, int64]
}

# NEED: this should be a page-aligned integer
udmabuf_offset_size = 0, 0x1000, 0x2000, 0x4000, 0x8000, 0x10000, 0x1000000, 0x100000000, 0xfffff000, 0x1000000000000, 0xfffffffffffff000, 0xfffffffff0000000