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: iommufd.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES.
 */
#ifndef _IOMMUFD_H
#define _IOMMUFD_H

#include <linux/ioctl.h>
#include <linux/types.h>

#define IOMMUFD_TYPE (';')

/**
 * DOC: General ioctl format
 *
 * The ioctl interface follows a general format to allow for extensibility. Each
 * ioctl is passed in a structure pointer as the argument providing the size of
 * the structure in the first u32. The kernel checks that any structure space
 * beyond what it understands is 0. This allows userspace to use the backward
 * compatible portion while consistently using the newer, larger, structures.
 *
 * ioctls use a standard meaning for common errnos:
 *
 *  - ENOTTY: The IOCTL number itself is not supported at all
 *  - E2BIG: The IOCTL number is supported, but the provided structure has
 *    non-zero in a part the kernel does not understand.
 *  - EOPNOTSUPP: The IOCTL number is supported, and the structure is
 *    understood, however a known field has a value the kernel does not
 *    understand or support.
 *  - EINVAL: Everything about the IOCTL was understood, but a field is not
 *    correct.
 *  - ENOENT: An ID or IOVA provided does not exist.
 *  - ENOMEM: Out of memory.
 *  - EOVERFLOW: Mathematics overflowed.
 *
 * As well as additional errnos, within specific ioctls.
 */
enum {
	IOMMUFD_CMD_BASE = 0x80,
	IOMMUFD_CMD_DESTROY = IOMMUFD_CMD_BASE,
	IOMMUFD_CMD_IOAS_ALLOC = 0x81,
	IOMMUFD_CMD_IOAS_ALLOW_IOVAS = 0x82,
	IOMMUFD_CMD_IOAS_COPY = 0x83,
	IOMMUFD_CMD_IOAS_IOVA_RANGES = 0x84,
	IOMMUFD_CMD_IOAS_MAP = 0x85,
	IOMMUFD_CMD_IOAS_UNMAP = 0x86,
	IOMMUFD_CMD_OPTION = 0x87,
	IOMMUFD_CMD_VFIO_IOAS = 0x88,
	IOMMUFD_CMD_HWPT_ALLOC = 0x89,
	IOMMUFD_CMD_GET_HW_INFO = 0x8a,
	IOMMUFD_CMD_HWPT_SET_DIRTY_TRACKING = 0x8b,
	IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP = 0x8c,
	IOMMUFD_CMD_HWPT_INVALIDATE = 0x8d,
	IOMMUFD_CMD_FAULT_QUEUE_ALLOC = 0x8e,
};

/**
 * struct iommu_destroy - ioctl(IOMMU_DESTROY)
 * @size: sizeof(struct iommu_destroy)
 * @id: iommufd object ID to destroy. Can be any destroyable object type.
 *
 * Destroy any object held within iommufd.
 */
struct iommu_destroy {
	__u32 size;
	__u32 id;
};
#define IOMMU_DESTROY _IO(IOMMUFD_TYPE, IOMMUFD_CMD_DESTROY)

/**
 * struct iommu_ioas_alloc - ioctl(IOMMU_IOAS_ALLOC)
 * @size: sizeof(struct iommu_ioas_alloc)
 * @flags: Must be 0
 * @out_ioas_id: Output IOAS ID for the allocated object
 *
 * Allocate an IO Address Space (IOAS) which holds an IO Virtual Address (IOVA)
 * to memory mapping.
 */
struct iommu_ioas_alloc {
	__u32 size;
	__u32 flags;
	__u32 out_ioas_id;
};
#define IOMMU_IOAS_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_ALLOC)

/**
 * struct iommu_iova_range - ioctl(IOMMU_IOVA_RANGE)
 * @start: First IOVA
 * @last: Inclusive last IOVA
 *
 * An interval in IOVA space.
 */
struct iommu_iova_range {
	__aligned_u64 start;
	__aligned_u64 last;
};

/**
 * struct iommu_ioas_iova_ranges - ioctl(IOMMU_IOAS_IOVA_RANGES)
 * @size: sizeof(struct iommu_ioas_iova_ranges)
 * @ioas_id: IOAS ID to read ranges from
 * @num_iovas: Input/Output total number of ranges in the IOAS
 * @__reserved: Must be 0
 * @allowed_iovas: Pointer to the output array of struct iommu_iova_range
 * @out_iova_alignment: Minimum alignment required for mapping IOVA
 *
 * Query an IOAS for ranges of allowed IOVAs. Mapping IOVA outside these ranges
 * is not allowed. num_iovas will be set to the total number of iovas and
 * the allowed_iovas[] will be filled in as space permits.
 *
 * The allowed ranges are dependent on the HW path the DMA operation takes, and
 * can change during the lifetime of the IOAS. A fresh empty IOAS will have a
 * full range, and each attached device will narrow the ranges based on that
 * device's HW restrictions. Detaching a device can widen the ranges. Userspace
 * should query ranges after every attach/detach to know what IOVAs are valid
 * for mapping.
 *
 * On input num_iovas is the length of the allowed_iovas array. On output it is
 * the total number of iovas filled in. The ioctl will return -EMSGSIZE and set
 * num_iovas to the required value if num_iovas is too small. In this case the
 * caller should allocate a larger output array and re-issue the ioctl.
 *
 * out_iova_alignment returns the minimum IOVA alignment that can be given
 * to IOMMU_IOAS_MAP/COPY. IOVA's must satisfy::
 *
 *   starting_iova % out_iova_alignment == 0
 *   (starting_iova + length) % out_iova_alignment == 0
 *
 * out_iova_alignment can be 1 indicating any IOVA is allowed. It cannot
 * be higher than the system PAGE_SIZE.
 */
struct iommu_ioas_iova_ranges {
	__u32 size;
	__u32 ioas_id;
	__u32 num_iovas;
	__u32 __reserved;
	__aligned_u64 allowed_iovas;
	__aligned_u64 out_iova_alignment;
};
#define IOMMU_IOAS_IOVA_RANGES _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_IOVA_RANGES)

/**
 * struct iommu_ioas_allow_iovas - ioctl(IOMMU_IOAS_ALLOW_IOVAS)
 * @size: sizeof(struct iommu_ioas_allow_iovas)
 * @ioas_id: IOAS ID to allow IOVAs from
 * @num_iovas: Input/Output total number of ranges in the IOAS
 * @__reserved: Must be 0
 * @allowed_iovas: Pointer to array of struct iommu_iova_range
 *
 * Ensure a range of IOVAs are always available for allocation. If this call
 * succeeds then IOMMU_IOAS_IOVA_RANGES will never return a list of IOVA ranges
 * that are narrower than the ranges provided here. This call will fail if
 * IOMMU_IOAS_IOVA_RANGES is currently narrower than the given ranges.
 *
 * When an IOAS is first created the IOVA_RANGES will be maximally sized, and as
 * devices are attached the IOVA will narrow based on the device restrictions.
 * When an allowed range is specified any narrowing will be refused, ie device
 * attachment can fail if the device requires limiting within the allowed range.
 *
 * Automatic IOVA allocation is also impacted by this call. MAP will only
 * allocate within the allowed IOVAs if they are present.
 *
 * This call replaces the entire allowed list with the given list.
 */
struct iommu_ioas_allow_iovas {
	__u32 size;
	__u32 ioas_id;
	__u32 num_iovas;
	__u32 __reserved;
	__aligned_u64 allowed_iovas;
};
#define IOMMU_IOAS_ALLOW_IOVAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_ALLOW_IOVAS)

/**
 * enum iommufd_ioas_map_flags - Flags for map and copy
 * @IOMMU_IOAS_MAP_FIXED_IOVA: If clear the kernel will compute an appropriate
 *                             IOVA to place the mapping at
 * @IOMMU_IOAS_MAP_WRITEABLE: DMA is allowed to write to this mapping
 * @IOMMU_IOAS_MAP_READABLE: DMA is allowed to read from this mapping
 */
enum iommufd_ioas_map_flags {
	IOMMU_IOAS_MAP_FIXED_IOVA = 1 << 0,
	IOMMU_IOAS_MAP_WRITEABLE = 1 << 1,
	IOMMU_IOAS_MAP_READABLE = 1 << 2,
};

/**
 * struct iommu_ioas_map - ioctl(IOMMU_IOAS_MAP)
 * @size: sizeof(struct iommu_ioas_map)
 * @flags: Combination of enum iommufd_ioas_map_flags
 * @ioas_id: IOAS ID to change the mapping of
 * @__reserved: Must be 0
 * @user_va: Userspace pointer to start mapping from
 * @length: Number of bytes to map
 * @iova: IOVA the mapping was placed at. If IOMMU_IOAS_MAP_FIXED_IOVA is set
 *        then this must be provided as input.
 *
 * Set an IOVA mapping from a user pointer. If FIXED_IOVA is specified then the
 * mapping will be established at iova, otherwise a suitable location based on
 * the reserved and allowed lists will be automatically selected and returned in
 * iova.
 *
 * If IOMMU_IOAS_MAP_FIXED_IOVA is specified then the iova range must currently
 * be unused, existing IOVA cannot be replaced.
 */
struct iommu_ioas_map {
	__u32 size;
	__u32 flags;
	__u32 ioas_id;
	__u32 __reserved;
	__aligned_u64 user_va;
	__aligned_u64 length;
	__aligned_u64 iova;
};
#define IOMMU_IOAS_MAP _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_MAP)

/**
 * struct iommu_ioas_copy - ioctl(IOMMU_IOAS_COPY)
 * @size: sizeof(struct iommu_ioas_copy)
 * @flags: Combination of enum iommufd_ioas_map_flags
 * @dst_ioas_id: IOAS ID to change the mapping of
 * @src_ioas_id: IOAS ID to copy from
 * @length: Number of bytes to copy and map
 * @dst_iova: IOVA the mapping was placed at. If IOMMU_IOAS_MAP_FIXED_IOVA is
 *            set then this must be provided as input.
 * @src_iova: IOVA to start the copy
 *
 * Copy an already existing mapping from src_ioas_id and establish it in
 * dst_ioas_id. The src iova/length must exactly match a range used with
 * IOMMU_IOAS_MAP.
 *
 * This may be used to efficiently clone a subset of an IOAS to another, or as a
 * kind of 'cache' to speed up mapping. Copy has an efficiency advantage over
 * establishing equivalent new mappings, as internal resources are shared, and
 * the kernel will pin the user memory only once.
 */
struct iommu_ioas_copy {
	__u32 size;
	__u32 flags;
	__u32 dst_ioas_id;
	__u32 src_ioas_id;
	__aligned_u64 length;
	__aligned_u64 dst_iova;
	__aligned_u64 src_iova;
};
#define IOMMU_IOAS_COPY _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_COPY)

/**
 * struct iommu_ioas_unmap - ioctl(IOMMU_IOAS_UNMAP)
 * @size: sizeof(struct iommu_ioas_unmap)
 * @ioas_id: IOAS ID to change the mapping of
 * @iova: IOVA to start the unmapping at
 * @length: Number of bytes to unmap, and return back the bytes unmapped
 *
 * Unmap an IOVA range. The iova/length must be a superset of a previously
 * mapped range used with IOMMU_IOAS_MAP or IOMMU_IOAS_COPY. Splitting or
 * truncating ranges is not allowed. The values 0 to U64_MAX will unmap
 * everything.
 */
struct iommu_ioas_unmap {
	__u32 size;
	__u32 ioas_id;
	__aligned_u64 iova;
	__aligned_u64 length;
};
#define IOMMU_IOAS_UNMAP _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_UNMAP)

/**
 * enum iommufd_option - ioctl(IOMMU_OPTION_RLIMIT_MODE) and
 *                       ioctl(IOMMU_OPTION_HUGE_PAGES)
 * @IOMMU_OPTION_RLIMIT_MODE:
 *    Change how RLIMIT_MEMLOCK accounting works. The caller must have privilege
 *    to invoke this. Value 0 (default) is user based accouting, 1 uses process
 *    based accounting. Global option, object_id must be 0
 * @IOMMU_OPTION_HUGE_PAGES:
 *    Value 1 (default) allows contiguous pages to be combined when generating
 *    iommu mappings. Value 0 disables combining, everything is mapped to
 *    PAGE_SIZE. This can be useful for benchmarking.  This is a per-IOAS
 *    option, the object_id must be the IOAS ID.
 */
enum iommufd_option {
	IOMMU_OPTION_RLIMIT_MODE = 0,
	IOMMU_OPTION_HUGE_PAGES = 1,
};

/**
 * enum iommufd_option_ops - ioctl(IOMMU_OPTION_OP_SET) and
 *                           ioctl(IOMMU_OPTION_OP_GET)
 * @IOMMU_OPTION_OP_SET: Set the option's value
 * @IOMMU_OPTION_OP_GET: Get the option's value
 */
enum iommufd_option_ops {
	IOMMU_OPTION_OP_SET = 0,
	IOMMU_OPTION_OP_GET = 1,
};

/**
 * struct iommu_option - iommu option multiplexer
 * @size: sizeof(struct iommu_option)
 * @option_id: One of enum iommufd_option
 * @op: One of enum iommufd_option_ops
 * @__reserved: Must be 0
 * @object_id: ID of the object if required
 * @val64: Option value to set or value returned on get
 *
 * Change a simple option value. This multiplexor allows controlling options
 * on objects. IOMMU_OPTION_OP_SET will load an option and IOMMU_OPTION_OP_GET
 * will return the current value.
 */
struct iommu_option {
	__u32 size;
	__u32 option_id;
	__u16 op;
	__u16 __reserved;
	__u32 object_id;
	__aligned_u64 val64;
};
#define IOMMU_OPTION _IO(IOMMUFD_TYPE, IOMMUFD_CMD_OPTION)

/**
 * enum iommufd_vfio_ioas_op - IOMMU_VFIO_IOAS_* ioctls
 * @IOMMU_VFIO_IOAS_GET: Get the current compatibility IOAS
 * @IOMMU_VFIO_IOAS_SET: Change the current compatibility IOAS
 * @IOMMU_VFIO_IOAS_CLEAR: Disable VFIO compatibility
 */
enum iommufd_vfio_ioas_op {
	IOMMU_VFIO_IOAS_GET = 0,
	IOMMU_VFIO_IOAS_SET = 1,
	IOMMU_VFIO_IOAS_CLEAR = 2,
};

/**
 * struct iommu_vfio_ioas - ioctl(IOMMU_VFIO_IOAS)
 * @size: sizeof(struct iommu_vfio_ioas)
 * @ioas_id: For IOMMU_VFIO_IOAS_SET the input IOAS ID to set
 *           For IOMMU_VFIO_IOAS_GET will output the IOAS ID
 * @op: One of enum iommufd_vfio_ioas_op
 * @__reserved: Must be 0
 *
 * The VFIO compatibility support uses a single ioas because VFIO APIs do not
 * support the ID field. Set or Get the IOAS that VFIO compatibility will use.
 * When VFIO_GROUP_SET_CONTAINER is used on an iommufd it will get the
 * compatibility ioas, either by taking what is already set, or auto creating
 * one. From then on VFIO will continue to use that ioas and is not effected by
 * this ioctl. SET or CLEAR does not destroy any auto-created IOAS.
 */
struct iommu_vfio_ioas {
	__u32 size;
	__u32 ioas_id;
	__u16 op;
	__u16 __reserved;
};
#define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS)

/**
 * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation
 * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT that can serve as
 *                                the parent HWPT in a nesting configuration.
 * @IOMMU_HWPT_ALLOC_DIRTY_TRACKING: Dirty tracking support for device IOMMU is
 *                                   enforced on device attachment
 * @IOMMU_HWPT_FAULT_ID_VALID: The fault_id field of hwpt allocation data is
 *                             valid.
 */
enum iommufd_hwpt_alloc_flags {
	IOMMU_HWPT_ALLOC_NEST_PARENT = 1 << 0,
	IOMMU_HWPT_ALLOC_DIRTY_TRACKING = 1 << 1,
	IOMMU_HWPT_FAULT_ID_VALID = 1 << 2,
};

/**
 * enum iommu_hwpt_vtd_s1_flags - Intel VT-d stage-1 page table
 *                                entry attributes
 * @IOMMU_VTD_S1_SRE: Supervisor request
 * @IOMMU_VTD_S1_EAFE: Extended access enable
 * @IOMMU_VTD_S1_WPE: Write protect enable
 */
enum iommu_hwpt_vtd_s1_flags {
	IOMMU_VTD_S1_SRE = 1 << 0,
	IOMMU_VTD_S1_EAFE = 1 << 1,
	IOMMU_VTD_S1_WPE = 1 << 2,
};

/**
 * struct iommu_hwpt_vtd_s1 - Intel VT-d stage-1 page table
 *                            info (IOMMU_HWPT_DATA_VTD_S1)
 * @flags: Combination of enum iommu_hwpt_vtd_s1_flags
 * @pgtbl_addr: The base address of the stage-1 page table.
 * @addr_width: The address width of the stage-1 page table
 * @__reserved: Must be 0
 */
struct iommu_hwpt_vtd_s1 {
	__aligned_u64 flags;
	__aligned_u64 pgtbl_addr;
	__u32 addr_width;
	__u32 __reserved;
};

/**
 * enum iommu_hwpt_data_type - IOMMU HWPT Data Type
 * @IOMMU_HWPT_DATA_NONE: no data
 * @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table
 */
enum iommu_hwpt_data_type {
	IOMMU_HWPT_DATA_NONE = 0,
	IOMMU_HWPT_DATA_VTD_S1 = 1,
};

/**
 * struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC)
 * @size: sizeof(struct iommu_hwpt_alloc)
 * @flags: Combination of enum iommufd_hwpt_alloc_flags
 * @dev_id: The device to allocate this HWPT for
 * @pt_id: The IOAS or HWPT to connect this HWPT to
 * @out_hwpt_id: The ID of the new HWPT
 * @__reserved: Must be 0
 * @data_type: One of enum iommu_hwpt_data_type
 * @data_len: Length of the type specific data
 * @data_uptr: User pointer to the type specific data
 * @fault_id: The ID of IOMMUFD_FAULT object. Valid only if flags field of
 *            IOMMU_HWPT_FAULT_ID_VALID is set.
 * @__reserved2: Padding to 64-bit alignment. Must be 0.
 *
 * Explicitly allocate a hardware page table object. This is the same object
 * type that is returned by iommufd_device_attach() and represents the
 * underlying iommu driver's iommu_domain kernel object.
 *
 * A kernel-managed HWPT will be created with the mappings from the given
 * IOAS via the @pt_id. The @data_type for this allocation must be set to
 * IOMMU_HWPT_DATA_NONE. The HWPT can be allocated as a parent HWPT for a
 * nesting configuration by passing IOMMU_HWPT_ALLOC_NEST_PARENT via @flags.
 *
 * A user-managed nested HWPT will be created from a given parent HWPT via
 * @pt_id, in which the parent HWPT must be allocated previously via the
 * same ioctl from a given IOAS (@pt_id). In this case, the @data_type
 * must be set to a pre-defined type corresponding to an I/O page table
 * type supported by the underlying IOMMU hardware.
 *
 * If the @data_type is set to IOMMU_HWPT_DATA_NONE, @data_len and
 * @data_uptr should be zero. Otherwise, both @data_len and @data_uptr
 * must be given.
 */
struct iommu_hwpt_alloc {
	__u32 size;
	__u32 flags;
	__u32 dev_id;
	__u32 pt_id;
	__u32 out_hwpt_id;
	__u32 __reserved;
	__u32 data_type;
	__u32 data_len;
	__aligned_u64 data_uptr;
	__u32 fault_id;
	__u32 __reserved2;
};
#define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC)

/**
 * enum iommu_hw_info_vtd_flags - Flags for VT-d hw_info
 * @IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17: If set, disallow read-only mappings
 *                                         on a nested_parent domain.
 *                                         https://www.intel.com/content/www/us/en/content-details/772415/content-details.html
 */
enum iommu_hw_info_vtd_flags {
	IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17 = 1 << 0,
};

/**
 * struct iommu_hw_info_vtd - Intel VT-d hardware information
 *
 * @flags: Combination of enum iommu_hw_info_vtd_flags
 * @__reserved: Must be 0
 *
 * @cap_reg: Value of Intel VT-d capability register defined in VT-d spec
 *           section 11.4.2 Capability Register.
 * @ecap_reg: Value of Intel VT-d capability register defined in VT-d spec
 *            section 11.4.3 Extended Capability Register.
 *
 * User needs to understand the Intel VT-d specification to decode the
 * register value.
 */
struct iommu_hw_info_vtd {
	__u32 flags;
	__u32 __reserved;
	__aligned_u64 cap_reg;
	__aligned_u64 ecap_reg;
};

/**
 * enum iommu_hw_info_type - IOMMU Hardware Info Types
 * @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware
 *                           info
 * @IOMMU_HW_INFO_TYPE_INTEL_VTD: Intel VT-d iommu info type
 */
enum iommu_hw_info_type {
	IOMMU_HW_INFO_TYPE_NONE = 0,
	IOMMU_HW_INFO_TYPE_INTEL_VTD = 1,
};

/**
 * enum iommufd_hw_capabilities
 * @IOMMU_HW_CAP_DIRTY_TRACKING: IOMMU hardware support for dirty tracking
 *                               If available, it means the following APIs
 *                               are supported:
 *
 *                                   IOMMU_HWPT_GET_DIRTY_BITMAP
 *                                   IOMMU_HWPT_SET_DIRTY_TRACKING
 *
 */
enum iommufd_hw_capabilities {
	IOMMU_HW_CAP_DIRTY_TRACKING = 1 << 0,
};

/**
 * struct iommu_hw_info - ioctl(IOMMU_GET_HW_INFO)
 * @size: sizeof(struct iommu_hw_info)
 * @flags: Must be 0
 * @dev_id: The device bound to the iommufd
 * @data_len: Input the length of a user buffer in bytes. Output the length of
 *            data that kernel supports
 * @data_uptr: User pointer to a user-space buffer used by the kernel to fill
 *             the iommu type specific hardware information data
 * @out_data_type: Output the iommu hardware info type as defined in the enum
 *                 iommu_hw_info_type.
 * @out_capabilities: Output the generic iommu capability info type as defined
 *                    in the enum iommu_hw_capabilities.
 * @__reserved: Must be 0
 *
 * Query an iommu type specific hardware information data from an iommu behind
 * a given device that has been bound to iommufd. This hardware info data will
 * be used to sync capabilities between the virtual iommu and the physical
 * iommu, e.g. a nested translation setup needs to check the hardware info, so
 * a guest stage-1 page table can be compatible with the physical iommu.
 *
 * To capture an iommu type specific hardware information data, @data_uptr and
 * its length @data_len must be provided. Trailing bytes will be zeroed if the
 * user buffer is larger than the data that kernel has. Otherwise, kernel only
 * fills the buffer using the given length in @data_len. If the ioctl succeeds,
 * @data_len will be updated to the length that kernel actually supports,
 * @out_data_type will be filled to decode the data filled in the buffer
 * pointed by @data_uptr. Input @data_len == zero is allowed.
 */
struct iommu_hw_info {
	__u32 size;
	__u32 flags;
	__u32 dev_id;
	__u32 data_len;
	__aligned_u64 data_uptr;
	__u32 out_data_type;
	__u32 __reserved;
	__aligned_u64 out_capabilities;
};
#define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO)

/*
 * enum iommufd_hwpt_set_dirty_tracking_flags - Flags for steering dirty
 *                                              tracking
 * @IOMMU_HWPT_DIRTY_TRACKING_ENABLE: Enable dirty tracking
 */
enum iommufd_hwpt_set_dirty_tracking_flags {
	IOMMU_HWPT_DIRTY_TRACKING_ENABLE = 1,
};

/**
 * struct iommu_hwpt_set_dirty_tracking - ioctl(IOMMU_HWPT_SET_DIRTY_TRACKING)
 * @size: sizeof(struct iommu_hwpt_set_dirty_tracking)
 * @flags: Combination of enum iommufd_hwpt_set_dirty_tracking_flags
 * @hwpt_id: HW pagetable ID that represents the IOMMU domain
 * @__reserved: Must be 0
 *
 * Toggle dirty tracking on an HW pagetable.
 */
struct iommu_hwpt_set_dirty_tracking {
	__u32 size;
	__u32 flags;
	__u32 hwpt_id;
	__u32 __reserved;
};
#define IOMMU_HWPT_SET_DIRTY_TRACKING _IO(IOMMUFD_TYPE, \
					  IOMMUFD_CMD_HWPT_SET_DIRTY_TRACKING)

/**
 * enum iommufd_hwpt_get_dirty_bitmap_flags - Flags for getting dirty bits
 * @IOMMU_HWPT_GET_DIRTY_BITMAP_NO_CLEAR: Just read the PTEs without clearing
 *                                        any dirty bits metadata. This flag
 *                                        can be passed in the expectation
 *                                        where the next operation is an unmap
 *                                        of the same IOVA range.
 *
 */
enum iommufd_hwpt_get_dirty_bitmap_flags {
	IOMMU_HWPT_GET_DIRTY_BITMAP_NO_CLEAR = 1,
};

/**
 * struct iommu_hwpt_get_dirty_bitmap - ioctl(IOMMU_HWPT_GET_DIRTY_BITMAP)
 * @size: sizeof(struct iommu_hwpt_get_dirty_bitmap)
 * @hwpt_id: HW pagetable ID that represents the IOMMU domain
 * @flags: Combination of enum iommufd_hwpt_get_dirty_bitmap_flags
 * @__reserved: Must be 0
 * @iova: base IOVA of the bitmap first bit
 * @length: IOVA range size
 * @page_size: page size granularity of each bit in the bitmap
 * @data: bitmap where to set the dirty bits. The bitmap bits each
 *        represent a page_size which you deviate from an arbitrary iova.
 *
 * Checking a given IOVA is dirty:
 *
 *  data[(iova / page_size) / 64] & (1ULL << ((iova / page_size) % 64))
 *
 * Walk the IOMMU pagetables for a given IOVA range to return a bitmap
 * with the dirty IOVAs. In doing so it will also by default clear any
 * dirty bit metadata set in the IOPTE.
 */
struct iommu_hwpt_get_dirty_bitmap {
	__u32 size;
	__u32 hwpt_id;
	__u32 flags;
	__u32 __reserved;
	__aligned_u64 iova;
	__aligned_u64 length;
	__aligned_u64 page_size;
	__aligned_u64 data;
};
#define IOMMU_HWPT_GET_DIRTY_BITMAP _IO(IOMMUFD_TYPE, \
					IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP)

/**
 * enum iommu_hwpt_invalidate_data_type - IOMMU HWPT Cache Invalidation
 *                                        Data Type
 * @IOMMU_HWPT_INVALIDATE_DATA_VTD_S1: Invalidation data for VTD_S1
 */
enum iommu_hwpt_invalidate_data_type {
	IOMMU_HWPT_INVALIDATE_DATA_VTD_S1 = 0,
};

/**
 * enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d
 *                                           stage-1 cache invalidation
 * @IOMMU_VTD_INV_FLAGS_LEAF: Indicates whether the invalidation applies
 *                            to all-levels page structure cache or just
 *                            the leaf PTE cache.
 */
enum iommu_hwpt_vtd_s1_invalidate_flags {
	IOMMU_VTD_INV_FLAGS_LEAF = 1 << 0,
};

/**
 * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
 *                                       (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
 * @addr: The start address of the range to be invalidated. It needs to
 *        be 4KB aligned.
 * @npages: Number of contiguous 4K pages to be invalidated.
 * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
 * @__reserved: Must be 0
 *
 * The Intel VT-d specific invalidation data for user-managed stage-1 cache
 * invalidation in nested translation. Userspace uses this structure to
 * tell the impacted cache scope after modifying the stage-1 page table.
 *
 * Invalidating all the caches related to the page table by setting @addr
 * to be 0 and @npages to be U64_MAX.
 *
 * The device TLB will be invalidated automatically if ATS is enabled.
 */
struct iommu_hwpt_vtd_s1_invalidate {
	__aligned_u64 addr;
	__aligned_u64 npages;
	__u32 flags;
	__u32 __reserved;
};

/**
 * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
 * @size: sizeof(struct iommu_hwpt_invalidate)
 * @hwpt_id: ID of a nested HWPT for cache invalidation
 * @data_uptr: User pointer to an array of driver-specific cache invalidation
 *             data.
 * @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the data
 *             type of all the entries in the invalidation request array. It
 *             should be a type supported by the hwpt pointed by @hwpt_id.
 * @entry_len: Length (in bytes) of a request entry in the request array
 * @entry_num: Input the number of cache invalidation requests in the array.
 *             Output the number of requests successfully handled by kernel.
 * @__reserved: Must be 0.
 *
 * Invalidate the iommu cache for user-managed page table. Modifications on a
 * user-managed page table should be followed by this operation to sync cache.
 * Each ioctl can support one or more cache invalidation requests in the array
 * that has a total size of @entry_len * @entry_num.
 *
 * An empty invalidation request array by setting @entry_num==0 is allowed, and
 * @entry_len and @data_uptr would be ignored in this case. This can be used to
 * check if the given @data_type is supported or not by kernel.
 */
struct iommu_hwpt_invalidate {
	__u32 size;
	__u32 hwpt_id;
	__aligned_u64 data_uptr;
	__u32 data_type;
	__u32 entry_len;
	__u32 entry_num;
	__u32 __reserved;
};
#define IOMMU_HWPT_INVALIDATE _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_INVALIDATE)

/**
 * enum iommu_hwpt_pgfault_flags - flags for struct iommu_hwpt_pgfault
 * @IOMMU_PGFAULT_FLAGS_PASID_VALID: The pasid field of the fault data is
 *                                   valid.
 * @IOMMU_PGFAULT_FLAGS_LAST_PAGE: It's the last fault of a fault group.
 */
enum iommu_hwpt_pgfault_flags {
	IOMMU_PGFAULT_FLAGS_PASID_VALID		= (1 << 0),
	IOMMU_PGFAULT_FLAGS_LAST_PAGE		= (1 << 1),
};

/**
 * enum iommu_hwpt_pgfault_perm - perm bits for struct iommu_hwpt_pgfault
 * @IOMMU_PGFAULT_PERM_READ: request for read permission
 * @IOMMU_PGFAULT_PERM_WRITE: request for write permission
 * @IOMMU_PGFAULT_PERM_EXEC: (PCIE 10.4.1) request with a PASID that has the
 *                           Execute Requested bit set in PASID TLP Prefix.
 * @IOMMU_PGFAULT_PERM_PRIV: (PCIE 10.4.1) request with a PASID that has the
 *                           Privileged Mode Requested bit set in PASID TLP
 *                           Prefix.
 */
enum iommu_hwpt_pgfault_perm {
	IOMMU_PGFAULT_PERM_READ			= (1 << 0),
	IOMMU_PGFAULT_PERM_WRITE		= (1 << 1),
	IOMMU_PGFAULT_PERM_EXEC			= (1 << 2),
	IOMMU_PGFAULT_PERM_PRIV			= (1 << 3),
};

/**
 * struct iommu_hwpt_pgfault - iommu page fault data
 * @flags: Combination of enum iommu_hwpt_pgfault_flags
 * @dev_id: id of the originated device
 * @pasid: Process Address Space ID
 * @grpid: Page Request Group Index
 * @perm: Combination of enum iommu_hwpt_pgfault_perm
 * @__reserved: Must be 0.
 * @addr: Fault address
 * @length: a hint of how much data the requestor is expecting to fetch. For
 *          example, if the PRI initiator knows it is going to do a 10MB
 *          transfer, it could fill in 10MB and the OS could pre-fault in
 *          10MB of IOVA. It's default to 0 if there's no such hint.
 * @cookie: kernel-managed cookie identifying a group of fault messages. The
 *          cookie number encoded in the last page fault of the group should
 *          be echoed back in the response message.
 */
struct iommu_hwpt_pgfault {
	__u32 flags;
	__u32 dev_id;
	__u32 pasid;
	__u32 grpid;
	__u32 perm;
	__u32 __reserved;
	__aligned_u64 addr;
	__u32 length;
	__u32 cookie;
};

/**
 * enum iommufd_page_response_code - Return status of fault handlers
 * @IOMMUFD_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
 *                             populated, retry the access. This is the
 *                             "Success" defined in PCI 10.4.2.1.
 * @IOMMUFD_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
 *                             access. This is the "Invalid Request" in PCI
 *                             10.4.2.1.
 */
enum iommufd_page_response_code {
	IOMMUFD_PAGE_RESP_SUCCESS = 0,
	IOMMUFD_PAGE_RESP_INVALID = 1,
};

/**
 * struct iommu_hwpt_page_response - IOMMU page fault response
 * @cookie: The kernel-managed cookie reported in the fault message.
 * @code: One of response code in enum iommufd_page_response_code.
 */
struct iommu_hwpt_page_response {
	__u32 cookie;
	__u32 code;
};

/**
 * struct iommu_fault_alloc - ioctl(IOMMU_FAULT_QUEUE_ALLOC)
 * @size: sizeof(struct iommu_fault_alloc)
 * @flags: Must be 0
 * @out_fault_id: The ID of the new FAULT
 * @out_fault_fd: The fd of the new FAULT
 *
 * Explicitly allocate a fault handling object.
 */
struct iommu_fault_alloc {
	__u32 size;
	__u32 flags;
	__u32 out_fault_id;
	__u32 out_fault_fd;
};
#define IOMMU_FAULT_QUEUE_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_FAULT_QUEUE_ALLOC)
#endif