golden hour

/usr/include/linux

File/Folder	Size	Actions
a.out.h	6.73 KB
acct.h	3.82 KB
acrn.h	16.29 KB
adb.h	1.11 KB
adfs_fs.h	993 B
affs_hardblocks.h	1.54 KB
agpgart.h	3.85 KB
aio_abi.h	3.32 KB
am437x-vpfe.h	3.59 KB
android	-
apm_bios.h	3.6 KB
arcfb.h	213 B
arm_sdei.h	2.69 KB
aspeed-lpc-ctrl.h	1.74 KB
aspeed-p2a-ctrl.h	1.86 KB
atalk.h	1023 B
atm.h	7.7 KB
atm_eni.h	648 B
atm_he.h	406 B
atm_idt77105.h	955 B
atm_nicstar.h	1.25 KB
atm_tcp.h	1.58 KB
atm_zatm.h	1.5 KB
atmapi.h	952 B
atmarp.h	1.27 KB
atmbr2684.h	3.19 KB
atmclip.h	576 B
atmdev.h	7.5 KB
atmioc.h	1.61 KB
atmlec.h	2.33 KB
atmmpc.h	4.13 KB
atmppp.h	639 B
atmsap.h	4.85 KB
atmsvc.h	1.81 KB
audit.h	21.06 KB
auto_dev-ioctl.h	4.87 KB
auto_fs.h	6.28 KB
auto_fs4.h	451 B
auxvec.h	1.56 KB
ax25.h	2.76 KB
batadv_packet.h	19.87 KB
batman_adv.h	16.49 KB
baycom.h	883 B
bcm933xx_hcs.h	419 B
bfs_fs.h	1.86 KB
binfmts.h	776 B
bits.h	447 B
blkpg.h	904 B
blktrace_api.h	4.59 KB
blkzoned.h	6.34 KB
bpf.h	272.11 KB
bpf_common.h	1.33 KB
bpf_perf_event.h	529 B
bpfilter.h	465 B
bpqether.h	981 B
bsg.h	2.44 KB
bt-bmc.h	572 B
btf.h	5.46 KB
btrfs.h	29.85 KB
btrfs_tree.h	25.22 KB
byteorder	-
cachefiles.h	1.61 KB
caif	-
can	-
can.h	11.03 KB
capability.h	13.17 KB
capi.h	3.05 KB
cciss_defs.h	3.2 KB
cciss_ioctl.h	2.7 KB
ccs.h	767 B
cdrom.h	28.87 KB
cec-funcs.h	53.14 KB
cec.h	40.47 KB
cfm_bridge.h	1.42 KB
cgroupstats.h	2.17 KB
chio.h	5.16 KB
cifs	-
close_range.h	377 B
cm4000_cs.h	1.76 KB
cn_proc.h	4.05 KB
coda.h	17.79 KB
coff.h	12.25 KB
connector.h	2.2 KB
const.h	987 B
coresight-stm.h	747 B
cramfs_fs.h	3.47 KB
cryptouser.h	5.2 KB
cuda.h	905 B
cxl_mem.h	7.73 KB
cycx_cfm.h	2.92 KB
dcbnl.h	24.7 KB
dccp.h	6.29 KB
devlink.h	22.3 KB
dlm.h	2.49 KB
dlm_device.h	2.48 KB
dlm_netlink.h	1.13 KB
dlm_plock.h	894 B
dlmconstants.h	4.96 KB
dm-ioctl.h	11.48 KB
dm-log-userspace.h	14.83 KB
dma-buf.h	5.12 KB
dma-heap.h	1.36 KB
dn.h	4.53 KB
dns_resolver.h	3.86 KB
dpll.h	7.19 KB
dqblk_xfs.h	9.17 KB
dvb	-
edd.h	5.47 KB
efs_fs_sb.h	2.17 KB
elf-em.h	2.57 KB
elf-fdpic.h	1.1 KB
elf.h	14.69 KB
errno.h	23 B
errqueue.h	1.94 KB
erspan.h	1.03 KB
ethtool.h	100.09 KB
ethtool_netlink.h	29.87 KB
eventfd.h	264 B
eventpoll.h	2.84 KB
f2fs.h	3.22 KB
fadvise.h	842 B
falloc.h	3.5 KB
fanotify.h	6.64 KB
fb.h	16.09 KB
fcntl.h	4.22 KB
fd.h	11.83 KB
fdreg.h	5.24 KB
fib_rules.h	1.99 KB
fiemap.h	2.71 KB
filter.h	2.16 KB
firewire-cdev.h	43.2 KB
firewire-constants.h	3.16 KB
fou.h	819 B
fpga-dfl.h	8.52 KB
fs.h	12.88 KB
fscrypt.h	6.41 KB
fsi.h	2.2 KB
fsl_hypervisor.h	7.13 KB
fsl_mc.h	734 B
fsmap.h	4.29 KB
fsverity.h	3.11 KB
fuse.h	25.36 KB
futex.h	5.98 KB
gameport.h	897 B
gen_stats.h	1.49 KB
genetlink.h	2.19 KB
genwqe	-
gfs2_ondisk.h	14.43 KB
gpio.h	19.46 KB
gsmmux.h	4.4 KB
gtp.h	734 B
handshake.h	1.61 KB
hash_info.h	971 B
hdlc	-
hdlc.h	637 B
hdlcdrv.h	2.84 KB
hdreg.h	22.17 KB
hid.h	2.04 KB
hiddev.h	6.2 KB
hidraw.h	1.95 KB
hpet.h	743 B
hsi	-
hsr_netlink.h	1.08 KB
hw_breakpoint.h	742 B
hyperv.h	10.89 KB
i2c-dev.h	1.83 KB
i2c.h	6.73 KB
i2o-dev.h	11.28 KB
i8k.h	1.49 KB
icmp.h	4.67 KB
icmpv6.h	4.2 KB
idxd.h	9.11 KB
if.h	10.67 KB
if_addr.h	1.84 KB
if_addrlabel.h	721 B
if_alg.h	1.53 KB
if_arcnet.h	3.63 KB
if_arp.h	6.41 KB
if_bonding.h	5.02 KB
if_bridge.h	20.18 KB
if_cablemodem.h	986 B
if_eql.h	1.32 KB
if_ether.h	8.21 KB
if_fc.h	1.7 KB
if_fddi.h	4.27 KB
if_hippi.h	4.14 KB
if_infiniband.h	1.22 KB
if_link.h	52.83 KB
if_ltalk.h	210 B
if_macsec.h	6.35 KB
if_packet.h	7.99 KB
if_phonet.h	424 B
if_plip.h	660 B
if_ppp.h	29 B
if_pppol2tp.h	3.23 KB
if_pppox.h	4.76 KB
if_slip.h	872 B
if_team.h	2.54 KB
if_tun.h	4 KB
if_tunnel.h	5.36 KB
if_vlan.h	1.79 KB
if_x25.h	881 B
if_xdp.h	4.89 KB
ife.h	351 B
igmp.h	2.99 KB
iio	-
ila.h	1.22 KB
in.h	10.15 KB
in6.h	7.36 KB
in_route.h	936 B
inet_diag.h	4.9 KB
inotify.h	3.21 KB
input-event-codes.h	29.5 KB
input.h	15.84 KB
io_uring.h	20.4 KB
ioctl.h	163 B
iommufd.h	28.39 KB
ioprio.h	4.08 KB
ip.h	4.7 KB
ip6_tunnel.h	1.91 KB
ip_vs.h	13.8 KB
ipc.h	2.05 KB
ipmi.h	15.08 KB
ipmi_bmc.h	488 B
ipmi_msgdefs.h	3.35 KB
ipmi_ssif_bmc.h	441 B
ipsec.h	947 B
ipv6.h	4.07 KB
ipv6_route.h	1.86 KB
ipx.h	2.29 KB
irqnr.h	104 B
isdn	-
iso_fs.h	6.33 KB
isst_if.h	14.92 KB
ivtv.h	2.95 KB
ivtvfb.h	1.18 KB
jffs2.h	6.66 KB
joystick.h	3.35 KB
kcm.h	822 B
kcmp.h	522 B
kcov.h	1.92 KB
kd.h	6.3 KB
kdev_t.h	383 B
kernel-page-flags.h	900 B
kernel.h	194 B
kernelcapi.h	1019 B
kexec.h	2.05 KB
keyboard.h	13.14 KB
keyctl.h	5.86 KB
kfd_ioctl.h	56.75 KB
kfd_sysfs.h	5.1 KB
kvm.h	46.76 KB
kvm_para.h	1001 B
l2tp.h	5.61 KB
landlock.h	10.14 KB
libc-compat.h	8.09 KB
limits.h	937 B
lirc.h	7.95 KB
llc.h	3.09 KB
loadpin.h	834 B
loop.h	3.32 KB
lp.h	4.09 KB
lsm.h	1.51 KB
lwtunnel.h	2.31 KB
magic.h	3.73 KB
major.h	4.55 KB
map_to_7segment.h	6.45 KB
matroxfb.h	1.43 KB
max2175.h	1.01 KB
mdio.h	23.78 KB
media-bus-format.h	6.75 KB
media.h	12.46 KB
mei.h	3.4 KB
mei_uuid.h	738 B
membarrier.h	9.14 KB
memfd.h	1.43 KB
mempolicy.h	2.51 KB
meye.h	2.47 KB
mii.h	9.27 KB
minix_fs.h	2.07 KB
misc	-
mman.h	1.75 KB
mmc	-
mmtimer.h	2.07 KB
module.h	293 B
mount.h	4.9 KB
mpls.h	2.25 KB
mpls_iptunnel.h	761 B
mptcp.h	3.67 KB
mptcp_pm.h	4.3 KB
mqueue.h	2.15 KB
mroute.h	5.78 KB
mroute6.h	4.81 KB
mrp_bridge.h	1.67 KB
msdos_fs.h	6.57 KB
msg.h	3.31 KB
mtio.h	7.98 KB
nbd-netlink.h	2.35 KB
nbd.h	3.77 KB
ncsi.h	4.71 KB
ndctl.h	6.67 KB
neighbour.h	5.91 KB
net.h	2.04 KB
net_dropmon.h	2.85 KB
net_namespace.h	715 B
net_tstamp.h	5.97 KB
netconf.h	614 B
netdev.h	5.39 KB
netdevice.h	2.2 KB
netfilter	-
netfilter.h	1.69 KB
netfilter_arp	-
netfilter_arp.h	445 B
netfilter_bridge	-
netfilter_bridge.h	1.14 KB
netfilter_decnet.h	1.72 KB
netfilter_ipv4	-
netfilter_ipv4.h	1.45 KB
netfilter_ipv6	-
netfilter_ipv6.h	1.35 KB
netlink.h	12.09 KB
netlink_diag.h	1.49 KB
netrom.h	807 B
nexthop.h	3.97 KB
nfc.h	10.95 KB
nfs.h	4.36 KB
nfs2.h	1.43 KB
nfs3.h	2.4 KB
nfs4.h	6.54 KB
nfs4_mount.h	1.89 KB
nfs_fs.h	1.62 KB
nfs_idmap.h	2.19 KB
nfs_mount.h	2.09 KB
nfsacl.h	718 B
nfsd	-
nfsd_netlink.h	1.95 KB
nilfs2_api.h	7.41 KB
nilfs2_ondisk.h	17.66 KB
nitro_enclaves.h	12.85 KB
nl80211.h	338.95 KB
nsfs.h	639 B
nubus.h	8 KB
nvme_ioctl.h	2.43 KB
nvram.h	532 B
omap3isp.h	20.36 KB
omapfb.h	5.78 KB
oom.h	511 B
openat2.h	1.42 KB
openvswitch.h	40.41 KB
packet_diag.h	1.63 KB
param.h	141 B
parport.h	3.56 KB
patchkey.h	892 B
pci.h	1.35 KB
pci_regs.h	60.58 KB
pcitest.h	920 B
perf_event.h	42.43 KB
personality.h	2.05 KB
pfkeyv2.h	10.32 KB
pfrut.h	7.8 KB
pg.h	2.34 KB
phantom.h	1.62 KB
phonet.h	4.57 KB
pidfd.h	256 B
pkt_cls.h	18.65 KB
pkt_sched.h	28.66 KB
pktcdvd.h	2.63 KB
pmu.h	5.32 KB
poll.h	22 B
posix_acl.h	1.22 KB
posix_acl_xattr.h	1.09 KB
posix_types.h	1.07 KB
ppdev.h	3.21 KB
ppp-comp.h	2.47 KB
ppp-ioctl.h	5.59 KB
ppp_defs.h	5.43 KB
pps.h	4.62 KB
pr.h	1.59 KB
prctl.h	10.81 KB
psample.h	2.57 KB
psci.h	5.02 KB
psp-dbc.h	5.16 KB
psp-sev.h	6.26 KB
ptp_clock.h	7.35 KB
ptrace.h	4.29 KB
qemu_fw_cfg.h	2.41 KB
qnx4_fs.h	2.27 KB
qnxtypes.h	624 B
qrtr.h	893 B
quota.h	6.16 KB
radeonfb.h	360 B
raid	-
random.h	1.38 KB
rds.h	10.91 KB
reboot.h	1.31 KB
reiserfs_fs.h	775 B
reiserfs_xattr.h	533 B
remoteproc_cdev.h	1.08 KB
resource.h	2.32 KB
rfkill.h	6.45 KB
rio_cm_cdev.h	3.17 KB
rio_mport_cdev.h	9.11 KB
rkisp1-config.h	30.63 KB
romfs_fs.h	1.21 KB
rose.h	2.18 KB
route.h	2.28 KB
rpl.h	814 B
rpl_iptunnel.h	424 B
rpmsg.h	1.03 KB
rpmsg_types.h	288 B
rseq.h	4.79 KB
rtc.h	5.19 KB
rtnetlink.h	20.8 KB
rxrpc.h	4.81 KB
scc.h	4.52 KB
sched	-
sched.h	6.12 KB
scif_ioctl.h	6.23 KB
screen_info.h	2.42 KB
sctp.h	35.18 KB
seccomp.h	5.6 KB
securebits.h	2.64 KB
sed-opal.h	5.29 KB
seg6.h	1.14 KB
seg6_genl.h	589 B
seg6_hmac.h	423 B
seg6_iptunnel.h	984 B
seg6_local.h	3.78 KB
selinux_netlink.h	1.17 KB
sem.h	2.98 KB
serial.h	4.9 KB
serial_core.h	4.93 KB
serial_reg.h	15.65 KB
serio.h	2.09 KB
sev-guest.h	2.47 KB
shm.h	3.71 KB
signal.h	388 B
signalfd.h	1.2 KB
smc.h	8.31 KB
smc_diag.h	2.77 KB
smiapp.h	1.03 KB
snmp.h	13.92 KB
sock_diag.h	1.27 KB
socket.h	919 B
sockios.h	6.69 KB
sonet.h	2.24 KB
sonypi.h	5.18 KB
sound.h	1.21 KB
soundcard.h	44.96 KB
spi	-
stat.h	7.23 KB
stddef.h	1.69 KB
stm.h	1.25 KB
string.h	238 B
sunrpc	-
surface_aggregator	-
suspend_ioctls.h	1.4 KB
swab.h	6.76 KB
switchtec_ioctl.h	5.14 KB
sync_file.h	3.49 KB
synclink.h	8.77 KB
sysctl.h	25.3 KB
sysinfo.h	1.02 KB
target_core_user.h	4.52 KB
taskstats.h	8.13 KB
tc_act	-
tc_ematch	-
tcp.h	11.65 KB
tcp_metrics.h	1.94 KB
tdx-guest.h	1.27 KB
tee.h	13.09 KB
termios.h	172 B
thermal.h	3.23 KB
time.h	1.71 KB
time_types.h	1.24 KB
timerfd.h	936 B
times.h	278 B
timex.h	7.63 KB
tiocl.h	1.69 KB
tipc.h	8.62 KB
tipc_config.h	14.52 KB
tipc_netlink.h	9.17 KB
tipc_sockets_diag.h	468 B
tls.h	7.06 KB
toshiba.h	1.88 KB
tps6594_pfsm.h	1.13 KB
tty.h	1.55 KB
tty_flags.h	4.4 KB
types.h	1.6 KB
udf_fs_i.h	697 B
udmabuf.h	643 B
udp.h	1.65 KB
uhid.h	4.54 KB
uinput.h	9.04 KB
uio.h	732 B
uleds.h	798 B
ultrasound.h	4.46 KB
um_timetravel.h	3.87 KB
un.h	384 B
unistd.h	220 B
unix_diag.h	1.3 KB
usb	-
usbdevice_fs.h	8.12 KB
usbip.h	1.47 KB
userfaultfd.h	10.68 KB
userio.h	1.48 KB
utime.h	223 B
utsname.h	669 B
uuid.h	28 B
uvcvideo.h	2.57 KB
v4l2-common.h	2.01 KB
v4l2-controls.h	94.59 KB
v4l2-dv-timings.h	30.39 KB
v4l2-mediabus.h	5.3 KB
v4l2-subdev.h	9.76 KB
vbox_err.h	7.09 KB
vbox_vmmdev_types.h	11.38 KB
vboxguest.h	9.15 KB
vdpa.h	1.74 KB
vduse.h	9.58 KB
version.h	374 B
veth.h	224 B
vfio.h	70.12 KB
vfio_ccw.h	1.29 KB
vfio_zdev.h	2.48 KB
vhost.h	8.24 KB
vhost_types.h	4.77 KB
videodev2.h	98.83 KB
virtio_9p.h	2 KB
virtio_balloon.h	5.16 KB
virtio_blk.h	9.75 KB
virtio_bt.h	910 B
virtio_config.h	4.36 KB
virtio_console.h	3.08 KB
virtio_crypto.h	13.56 KB
virtio_fs.h	573 B
virtio_gpio.h	1.7 KB
virtio_gpu.h	11.28 KB
virtio_i2c.h	1.16 KB
virtio_ids.h	3.7 KB
virtio_input.h	2.46 KB
virtio_iommu.h	3.84 KB
virtio_mem.h	6.99 KB
virtio_mmio.h	4.85 KB
virtio_net.h	14.72 KB
virtio_pci.h	7.3 KB
virtio_pcidev.h	2.33 KB
virtio_pmem.h	641 B
virtio_ring.h	8.52 KB
virtio_rng.h	265 B
virtio_scmi.h	637 B
virtio_scsi.h	5.94 KB
virtio_snd.h	12.86 KB
virtio_types.h	2.1 KB
virtio_vsock.h	3.27 KB
vm_sockets.h	7.18 KB
vm_sockets_diag.h	963 B
vmcore.h	455 B
vsockmon.h	1.84 KB
vt.h	2.99 KB
vtpm_proxy.h	1.68 KB
wait.h	682 B
watch_queue.h	3.41 KB
watchdog.h	2.28 KB
wireguard.h	7.57 KB
wireless.h	41.7 KB
wmi.h	1.72 KB
wwan.h	295 B
x25.h	3.48 KB
xattr.h	2.95 KB
xdp_diag.h	1.43 KB
xfrm.h	12.33 KB
xilinx-v4l2-controls.h	2.91 KB
zorro.h	3.22 KB
zorro_ids.h	29.26 KB

Edit: vduse.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _VDUSE_H_
#define _VDUSE_H_

#include <linux/types.h>

#define VDUSE_BASE	0x81

/* The ioctls for control device (/dev/vduse/control) */

#define VDUSE_API_VERSION	0

/*
 * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
 * This is used for future extension.
 */
#define VDUSE_GET_API_VERSION	_IOR(VDUSE_BASE, 0x00, __u64)

/* Set the version of VDUSE API that userspace supported. */
#define VDUSE_SET_API_VERSION	_IOW(VDUSE_BASE, 0x01, __u64)

/**
 * struct vduse_dev_config - basic configuration of a VDUSE device
 * @name: VDUSE device name, needs to be NUL terminated
 * @vendor_id: virtio vendor id
 * @device_id: virtio device id
 * @features: virtio features
 * @vq_num: the number of virtqueues
 * @vq_align: the allocation alignment of virtqueue's metadata
 * @reserved: for future use, needs to be initialized to zero
 * @config_size: the size of the configuration space
 * @config: the buffer of the configuration space
 *
 * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device.
 */
struct vduse_dev_config {
#define VDUSE_NAME_MAX	256
	char name[VDUSE_NAME_MAX];
	__u32 vendor_id;
	__u32 device_id;
	__u64 features;
	__u32 vq_num;
	__u32 vq_align;
	__u32 reserved[13];
	__u32 config_size;
	__u8 config[];
};

/* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */
#define VDUSE_CREATE_DEV	_IOW(VDUSE_BASE, 0x02, struct vduse_dev_config)

/*
 * Destroy a VDUSE device. Make sure there are no more references
 * to the char device (/dev/vduse/$NAME).
 */
#define VDUSE_DESTROY_DEV	_IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX])

/* The ioctls for VDUSE device (/dev/vduse/$NAME) */

/**
 * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last]
 * @offset: the mmap offset on returned file descriptor
 * @start: start of the IOVA region
 * @last: last of the IOVA region
 * @perm: access permission of the IOVA region
 *
 * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region.
 */
struct vduse_iotlb_entry {
	__u64 offset;
	__u64 start;
	__u64 last;
#define VDUSE_ACCESS_RO 0x1
#define VDUSE_ACCESS_WO 0x2
#define VDUSE_ACCESS_RW 0x3
	__u8 perm;
};

/*
 * Find the first IOVA region that overlaps with the range [start, last]
 * and return the corresponding file descriptor. Return -EINVAL means the
 * IOVA region doesn't exist. Caller should set start and last fields.
 */
#define VDUSE_IOTLB_GET_FD	_IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry)

/*
 * Get the negotiated virtio features. It's a subset of the features in
 * struct vduse_dev_config which can be accepted by virtio driver. It's
 * only valid after FEATURES_OK status bit is set.
 */
#define VDUSE_DEV_GET_FEATURES	_IOR(VDUSE_BASE, 0x11, __u64)

/**
 * struct vduse_config_data - data used to update configuration space
 * @offset: the offset from the beginning of configuration space
 * @length: the length to write to configuration space
 * @buffer: the buffer used to write from
 *
 * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device
 * configuration space.
 */
struct vduse_config_data {
	__u32 offset;
	__u32 length;
	__u8 buffer[];
};

/* Set device configuration space */
#define VDUSE_DEV_SET_CONFIG	_IOW(VDUSE_BASE, 0x12, struct vduse_config_data)

/*
 * Inject a config interrupt. It's usually used to notify virtio driver
 * that device configuration space has changed.
 */
#define VDUSE_DEV_INJECT_CONFIG_IRQ	_IO(VDUSE_BASE, 0x13)

/**
 * struct vduse_vq_config - basic configuration of a virtqueue
 * @index: virtqueue index
 * @max_size: the max size of virtqueue
 * @reserved: for future use, needs to be initialized to zero
 *
 * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue.
 */
struct vduse_vq_config {
	__u32 index;
	__u16 max_size;
	__u16 reserved[13];
};

/*
 * Setup the specified virtqueue. Make sure all virtqueues have been
 * configured before the device is attached to vDPA bus.
 */
#define VDUSE_VQ_SETUP		_IOW(VDUSE_BASE, 0x14, struct vduse_vq_config)

/**
 * struct vduse_vq_state_split - split virtqueue state
 * @avail_index: available index
 */
struct vduse_vq_state_split {
	__u16 avail_index;
};

/**
 * struct vduse_vq_state_packed - packed virtqueue state
 * @last_avail_counter: last driver ring wrap counter observed by device
 * @last_avail_idx: device available index
 * @last_used_counter: device ring wrap counter
 * @last_used_idx: used index
 */
struct vduse_vq_state_packed {
	__u16 last_avail_counter;
	__u16 last_avail_idx;
	__u16 last_used_counter;
	__u16 last_used_idx;
};

/**
 * struct vduse_vq_info - information of a virtqueue
 * @index: virtqueue index
 * @num: the size of virtqueue
 * @desc_addr: address of desc area
 * @driver_addr: address of driver area
 * @device_addr: address of device area
 * @split: split virtqueue state
 * @packed: packed virtqueue state
 * @ready: ready status of virtqueue
 *
 * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information.
 */
struct vduse_vq_info {
	__u32 index;
	__u32 num;
	__u64 desc_addr;
	__u64 driver_addr;
	__u64 device_addr;
	union {
		struct vduse_vq_state_split split;
		struct vduse_vq_state_packed packed;
	};
	__u8 ready;
};

/* Get the specified virtqueue's information. Caller should set index field. */
#define VDUSE_VQ_GET_INFO	_IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info)

/**
 * struct vduse_vq_eventfd - eventfd configuration for a virtqueue
 * @index: virtqueue index
 * @fd: eventfd, -1 means de-assigning the eventfd
 *
 * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd.
 */
struct vduse_vq_eventfd {
	__u32 index;
#define VDUSE_EVENTFD_DEASSIGN -1
	int fd;
};

/*
 * Setup kick eventfd for specified virtqueue. The kick eventfd is used
 * by VDUSE kernel module to notify userspace to consume the avail vring.
 */
#define VDUSE_VQ_SETUP_KICKFD	_IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd)

/*
 * Inject an interrupt for specific virtqueue. It's used to notify virtio driver
 * to consume the used vring.
 */
#define VDUSE_VQ_INJECT_IRQ	_IOW(VDUSE_BASE, 0x17, __u32)

/**
 * struct vduse_iova_umem - userspace memory configuration for one IOVA region
 * @uaddr: start address of userspace memory, it must be aligned to page size
 * @iova: start of the IOVA region
 * @size: size of the IOVA region
 * @reserved: for future use, needs to be initialized to zero
 *
 * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM
 * ioctls to register/de-register userspace memory for IOVA regions
 */
struct vduse_iova_umem {
	__u64 uaddr;
	__u64 iova;
	__u64 size;
	__u64 reserved[3];
};

/* Register userspace memory for IOVA regions */
#define VDUSE_IOTLB_REG_UMEM	_IOW(VDUSE_BASE, 0x18, struct vduse_iova_umem)

/* De-register the userspace memory. Caller should set iova and size field. */
#define VDUSE_IOTLB_DEREG_UMEM	_IOW(VDUSE_BASE, 0x19, struct vduse_iova_umem)

/**
 * struct vduse_iova_info - information of one IOVA region
 * @start: start of the IOVA region
 * @last: last of the IOVA region
 * @capability: capability of the IOVA regsion
 * @reserved: for future use, needs to be initialized to zero
 *
 * Structure used by VDUSE_IOTLB_GET_INFO ioctl to get information of
 * one IOVA region.
 */
struct vduse_iova_info {
	__u64 start;
	__u64 last;
#define VDUSE_IOVA_CAP_UMEM (1 << 0)
	__u64 capability;
	__u64 reserved[3];
};

/*
 * Find the first IOVA region that overlaps with the range [start, last]
 * and return some information on it. Caller should set start and last fields.
 */
#define VDUSE_IOTLB_GET_INFO	_IOWR(VDUSE_BASE, 0x1a, struct vduse_iova_info)

/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */

/**
 * enum vduse_req_type - request type
 * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace
 * @VDUSE_SET_STATUS: set the device status
 * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
 *                      specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
 */
enum vduse_req_type {
	VDUSE_GET_VQ_STATE,
	VDUSE_SET_STATUS,
	VDUSE_UPDATE_IOTLB,
};

/**
 * struct vduse_vq_state - virtqueue state
 * @index: virtqueue index
 * @split: split virtqueue state
 * @packed: packed virtqueue state
 */
struct vduse_vq_state {
	__u32 index;
	union {
		struct vduse_vq_state_split split;
		struct vduse_vq_state_packed packed;
	};
};

/**
 * struct vduse_dev_status - device status
 * @status: device status
 */
struct vduse_dev_status {
	__u8 status;
};

/**
 * struct vduse_iova_range - IOVA range [start, last]
 * @start: start of the IOVA range
 * @last: last of the IOVA range
 */
struct vduse_iova_range {
	__u64 start;
	__u64 last;
};

/**
 * struct vduse_dev_request - control request
 * @type: request type
 * @request_id: request id
 * @reserved: for future use
 * @vq_state: virtqueue state, only index field is available
 * @s: device status
 * @iova: IOVA range for updating
 * @padding: padding
 *
 * Structure used by read(2) on /dev/vduse/$NAME.
 */
struct vduse_dev_request {
	__u32 type;
	__u32 request_id;
	__u32 reserved[4];
	union {
		struct vduse_vq_state vq_state;
		struct vduse_dev_status s;
		struct vduse_iova_range iova;
		__u32 padding[32];
	};
};

/**
 * struct vduse_dev_response - response to control request
 * @request_id: corresponding request id
 * @result: the result of request
 * @reserved: for future use, needs to be initialized to zero
 * @vq_state: virtqueue state
 * @padding: padding
 *
 * Structure used by write(2) on /dev/vduse/$NAME.
 */
struct vduse_dev_response {
	__u32 request_id;
#define VDUSE_REQ_RESULT_OK	0x00
#define VDUSE_REQ_RESULT_FAILED	0x01
	__u32 result;
	__u32 reserved[4];
	union {
		struct vduse_vq_state vq_state;
		__u32 padding[32];
	};
};

#endif /* _VDUSE_H_ */