FM / linux

/usr/src/linux-headers-5.15.0-181/include/linux/

/usr/src/linux-headers-5.15.0-181/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
atomic/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
device/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
greybus/	-	0755	rm
hsi/	-	0755	rm
i3c/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mdio/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
surface_aggregator/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	40902	0644	edit dl rm
acpi_dma.h	3154	0644	edit dl rm
acpi_iort.h	2403	0644	edit dl rm
acpi_mdio.h	819	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
acpi_viot.h	478	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adreno-smmu-priv.h	2807	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3881	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1747	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1990	0644	edit dl rm
alcor_pci.h	9043	0644	edit dl rm
align.h	552	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6325	0644	edit dl rm
anon_inodes.h	670	0644	edit dl rm
apm-emulation.h	1599	0644	edit dl rm
apm_bios.h	2305	0644	edit dl rm
apple-gmux.h	918	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	2551	0644	edit dl rm
arm-cci.h	1390	0644	edit dl rm
arm-smccc.h	17382	0644	edit dl rm
armada-37xx-rwtm-mailbox.h	431	0644	edit dl rm
arm_ffa.h	7545	0644	edit dl rm
arm_sdei.h	2730	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	555	0644	edit dl rm
asn1.h	1832	0644	edit dl rm
asn1_ber_bytecode.h	2576	0644	edit dl rm
asn1_decoder.h	468	0644	edit dl rm
asn1_encoder.h	1006	0644	edit dl rm
assoc_array.h	2949	0644	edit dl rm
assoc_array_priv.h	5423	0644	edit dl rm
async.h	4439	0644	edit dl rm
async_tx.h	6860	0644	edit dl rm
ata.h	33799	0644	edit dl rm
atalk.h	4586	0644	edit dl rm
ata_platform.h	749	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10477	0644	edit dl rm
atmel-isc-media.h	2115	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1295	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	2644	0644	edit dl rm
attribute_container.h	2803	0644	edit dl rm
audit.h	19921	0644	edit dl rm
auto_dev-ioctl.h	296	0644	edit dl rm
auto_fs.h	278	0644	edit dl rm
auxiliary_bus.h	2539	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
backing-dev-defs.h	8753	0644	edit dl rm
backing-dev.h	12189	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	5892	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2152	0644	edit dl rm
bcm47xx_nvram.h	1033	0644	edit dl rm
bcm47xx_sprom.h	616	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	4683	0644	edit dl rm
bio.h	20108	0644	edit dl rm
bitfield.h	5460	0644	edit dl rm
bitmap.h	22664	0644	edit dl rm
bitops.h	8733	0644	edit dl rm
bitrev.h	2594	0644	edit dl rm
bits.h	1387	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22648	0644	edit dl rm
blk-crypto.h	4117	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	273	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	19834	0644	edit dl rm
blk-pm.h	708	0644	edit dl rm
blkdev.h	58041	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3858	0644	edit dl rm
blk_types.h	15669	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1286	0644	edit dl rm
bootconfig.h	8712	0644	edit dl rm
bootmem_info.h	1733	0644	edit dl rm
bottom_half.h	974	0644	edit dl rm
bpf-cgroup.h	18796	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	76212	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	2029	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5359	0644	edit dl rm
bpf_lsm.h	1456	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5536	0644	edit dl rm
bpf_verifier.h	20865	0644	edit dl rm
brcmphy.h	13994	0644	edit dl rm
bsearch.h	624	0644	edit dl rm
bsg-lib.h	1759	0644	edit dl rm
bsg.h	492	0644	edit dl rm
btf.h	7432	0644	edit dl rm
btf_ids.h	5463	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	7000	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14814	0644	edit dl rm
bug.h	2220	0644	edit dl rm
build-salt.h	375	0644	edit dl rm
buildid.h	561	0644	edit dl rm
build_bug.h	2823	0644	edit dl rm
bvec.h	6319	0644	edit dl rm
c2port.h	1384	0644	edit dl rm
cache.h	2616	0644	edit dl rm
cacheinfo.h	3837	0644	edit dl rm
capability.h	8486	0644	edit dl rm
cb710.h	5490	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18577	0644	edit dl rm
cc_platform.h	2378	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9197	0644	edit dl rm
cfag12864b.h	1509	0644	edit dl rm
cfi.h	1152	0644	edit dl rm
cgroup-defs.h	24815	0644	edit dl rm
cgroup.h	28840	0644	edit dl rm
cgroup_rdma.h	1206	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	4986	0644	edit dl rm
clk-provider.h	59330	0644	edit dl rm
clk.h	34418	0644	edit dl rm
clkdev.h	1322	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	10227	0644	edit dl rm
clocksource_ids.h	247	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	2004	0644	edit dl rm
cnt32_to_63.h	3545	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2215	0644	edit dl rm
compaction.h	7319	0644	edit dl rm
compat.h	32122	0644	edit dl rm
compiler-clang.h	4150	0644	edit dl rm
compiler-gcc.h	5021	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler-version.h	517	0644	edit dl rm
compiler.h	8553	0644	edit dl rm
compiler_attributes.h	13557	0644	edit dl rm
compiler_types.h	11023	0644	edit dl rm
completion.h	4101	0644	edit dl rm
component.h	4163	0644	edit dl rm
configfs.h	8683	0644	edit dl rm
connector.h	3927	0644	edit dl rm
console.h	7758	0644	edit dl rm
consolemap.h	1076	0644	edit dl rm
console_struct.h	7253	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	610	0644	edit dl rm
context_tracking.h	3362	0644	edit dl rm
context_tracking_state.h	1616	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	2132	0644	edit dl rm
coredump.h	1154	0644	edit dl rm
coresight-pmu.h	1355	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	18449	0644	edit dl rm
counter.h	15318	0644	edit dl rm
count_zeros.h	1453	0644	edit dl rm
cper.h	16947	0644	edit dl rm
cpu.h	8485	0644	edit dl rm
cpufeature.h	1751	0644	edit dl rm
cpufreq.h	33551	0644	edit dl rm
cpuhotplug.h	16949	0644	edit dl rm
cpuidle.h	10516	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	30089	0644	edit dl rm
cpuset.h	8351	0644	edit dl rm
cpu_cooling.h	1901	0644	edit dl rm
cpu_pm.h	2433	0644	edit dl rm
cpu_rmap.h	1721	0644	edit dl rm
crash_core.h	3465	0644	edit dl rm
crash_dump.h	4149	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	531	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	540	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
crc64.h	280	0644	edit dl rm
cred.h	12804	0644	edit dl rm
crypto.h	27890	0644	edit dl rm
cs5535.h	6277	0644	edit dl rm
ctype.h	1912	0644	edit dl rm
cuda.h	613	0644	edit dl rm
damon.h	10601	0644	edit dl rm
dasd_mod.h	204	0644	edit dl rm
davinci_emac.h	1080	0644	edit dl rm
dax.h	6719	0644	edit dl rm
dca.h	1922	0644	edit dl rm
dcache.h	19076	0644	edit dl rm
dccp.h	10988	0644	edit dl rm
debugfs.h	12253	0644	edit dl rm
debugobjects.h	4085	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2490	0644	edit dl rm
delayacct.h	5584	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
devcoredump.h	2266	0644	edit dl rm
devfreq-event.h	6095	0644	edit dl rm
devfreq.h	14370	0644	edit dl rm
devfreq_cooling.h	2763	0644	edit dl rm
device-mapper.h	19371	0644	edit dl rm
device.h	33997	0644	edit dl rm
device_cgroup.h	1609	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1156	0644	edit dl rm
dev_printk.h	9406	0644	edit dl rm
dfl.h	2435	0644	edit dl rm
digsig.h	1212	0644	edit dl rm
dim.h	9421	0644	edit dl rm
dio.h	11019	0644	edit dl rm
dirent.h	215	0644	edit dl rm
dlm.h	6005	0644	edit dl rm
dlm_plock.h	532	0644	edit dl rm
dm-bufio.h	4992	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	987	0644	edit dl rm
dma-buf-map.h	8318	0644	edit dl rm
dma-buf.h	20962	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2191	0644	edit dl rm
dma-fence-chain.h	3144	0644	edit dl rm
dma-fence.h	21357	0644	edit dl rm
dma-heap.h	1616	0644	edit dl rm
dma-iommu.h	2265	0644	edit dl rm
dma-map-ops.h	13197	0644	edit dl rm
dma-mapping.h	20589	0644	edit dl rm
dma-resv.h	12236	0644	edit dl rm
dmaengine.h	54851	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	7929	0644	edit dl rm
dmi.h	4372	0644	edit dl rm
dnotify.h	1044	0644	edit dl rm
dns_resolver.h	1390	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10311	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dtpm.h	1684	0644	edit dl rm
dw_apb_timer.h	1566	0644	edit dl rm
dynamic_debug.h	6471	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	19924	0644	edit dl rm
edd.h	1077	0644	edit dl rm
eeprom_93cx6.h	2707	0644	edit dl rm
eeprom_93xx46.h	1062	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	43038	0644	edit dl rm
efi_embedded_fw.h	1060	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	5653	0644	edit dl rm
elf-fdpic.h	2030	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	3030	0644	edit dl rm
elfcore-compat.h	1302	0644	edit dl rm
elfcore.h	4209	0644	edit dl rm
elfnote-lto.h	314	0644	edit dl rm
elfnote.h	3626	0644	edit dl rm
enclosure.h	4112	0644	edit dl rm
energy_model.h	8361	0644	edit dl rm
entry-common.h	17359	0644	edit dl rm
entry-kvm.h	2800	0644	edit dl rm
err.h	1527	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1481	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	17607	0644	edit dl rm
ethtool.h	32505	0644	edit dl rm
ethtool_netlink.h	2029	0644	edit dl rm
eventfd.h	2336	0644	edit dl rm
eventpoll.h	2472	0644	edit dl rm
evm.h	3500	0644	edit dl rm
export.h	5394	0644	edit dl rm
exportfs.h	8421	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	3919	0644	edit dl rm
extcon.h	10399	0644	edit dl rm
f2fs_fs.h	19471	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1624	0644	edit dl rm
fanotify.h	4547	0644	edit dl rm
fault-inject-usercopy.h	496	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28958	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	774	0644	edit dl rm
fcntl.h	1698	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	833	0644	edit dl rm
fdtable.h	3571	0644	edit dl rm
fec.h	463	0644	edit dl rm
fiemap.h	713	0644	edit dl rm
file.h	3158	0644	edit dl rm
fileattr.h	1952	0644	edit dl rm
filter.h	43995	0644	edit dl rm
fips.h	303	0644	edit dl rm
firewire.h	13718	0644	edit dl rm
firmware-map.h	959	0644	edit dl rm
firmware.h	3348	0644	edit dl rm
fixp-arith.h	4290	0644	edit dl rm
flat.h	2629	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
font.h	1714	0644	edit dl rm
fortify-string.h	9329	0644	edit dl rm
freelist.h	3890	0644	edit dl rm
freezer.h	9193	0644	edit dl rm
frontswap.h	3118	0644	edit dl rm
fs.h	125506	0644	edit dl rm
fscache-cache.h	19025	0644	edit dl rm
fscache.h	30303	0644	edit dl rm
fscrypt.h	30622	0644	edit dl rm
fsi-occ.h	681	0644	edit dl rm
fsi-sbefifo.h	629	0644	edit dl rm
fsi.h	2318	0644	edit dl rm
fsl-diu-fb.h	3963	0644	edit dl rm
fsldma.h	202	0644	edit dl rm
fsl_devices.h	4261	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25063	0644	edit dl rm
fsnotify.h	10287	0644	edit dl rm
fsnotify_backend.h	30006	0644	edit dl rm
fsverity.h	6914	0644	edit dl rm
fs_context.h	8818	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4543	0644	edit dl rm
fs_pin.h	539	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1066	0644	edit dl rm
fs_types.h	2071	0644	edit dl rm
fs_uart_pd.h	1523	0644	edit dl rm
ftrace.h	35597	0644	edit dl rm
ftrace_irq.h	884	0644	edit dl rm
futex.h	2497	0644	edit dl rm
fwnode.h	6989	0644	edit dl rm
fwnode_mdio.h	858	0644	edit dl rm
gameport.h	5549	0644	edit dl rm
gcd.h	193	0644	edit dl rm
genalloc.h	7912	0644	edit dl rm
generic-radix-tree.h	6504	0644	edit dl rm
genetlink.h	589	0644	edit dl rm
genhd.h	9055	0644	edit dl rm
genl_magic_func.h	11809	0644	edit dl rm
genl_magic_struct.h	7793	0644	edit dl rm
getcpu.h	641	0644	edit dl rm
gfp.h	26892	0644	edit dl rm
glob.h	256	0644	edit dl rm
gnss.h	1601	0644	edit dl rm
goldfish.h	878	0644	edit dl rm
gpio-pxa.h	571	0644	edit dl rm
gpio.h	5423	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
greybus.h	4240	0644	edit dl rm
hardirq.h	3516	0644	edit dl rm
hash.h	3071	0644	edit dl rm
hashtable.h	6827	0644	edit dl rm
hdlc.h	3267	0644	edit dl rm
hdlcdrv.h	6468	0644	edit dl rm
hdmi.h	12705	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38923	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	5239	0644	edit dl rm
highmem.h	9731	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5248	0644	edit dl rm
hippidevice.h	1052	0644	edit dl rm
hmm.h	4168	0644	edit dl rm
host1x.h	10993	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16515	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	30416	0644	edit dl rm
hugetlb_cgroup.h	7241	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
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Edit: /usr/src/linux-headers-5.15.0-181/include/linux/hyperv.h (50218B)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *
 * Copyright (c) 2011, Microsoft Corporation.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 *   K. Y. Srinivasan <kys@microsoft.com>
 */

#ifndef _HYPERV_H
#define _HYPERV_H

#include <uapi/linux/hyperv.h>

#include <linux/mm.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/interrupt.h>
#include <linux/reciprocal_div.h>
#include <asm/hyperv-tlfs.h>

#define MAX_PAGE_BUFFER_COUNT				32
#define MAX_MULTIPAGE_BUFFER_COUNT			32 /* 128K */

#pragma pack(push, 1)

/*
 * Types for GPADL, decides is how GPADL header is created.
 *
 * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the
 * same as HV_HYP_PAGE_SIZE.
 *
 * If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers
 * will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put
 * into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each
 * HV_HYP_PAGE will be different between different types of GPADL, for example
 * if PAGE_SIZE is 64K:
 *
 * BUFFER:
 *
 * gva:    |--       64k      --|--       64k      --| ... |
 * gpa:    | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k |
 * index:  0    1    2     15   16   17   18 .. 31   32 ...
 *         |    |    ...   |    |    |   ...    |   ...
 *         v    V          V    V    V          V
 * gpadl:  | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... |
 * index:  0    1    2 ... 15   16   17   18 .. 31   32 ...
 *
 * RING:
 *
 *         | header  |           data           | header  |     data      |
 * gva:    |-- 64k --|--       64k      --| ... |-- 64k --|-- 64k --| ... |
 * gpa:    | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... |
 * index:  0    1    16   17   18    31   ...   n   n+1  n+16 ...         2n
 *         |         /    /          /          |         /               /
 *         |        /    /          /           |        /               /
 *         |       /    /   ...    /    ...     |       /      ...      /
 *         |      /    /          /             |      /               /
 *         |     /    /          /              |     /               /
 *         V    V    V          V               V    V               v
 * gpadl:  | 4k | 4k |   ...    |    ...        | 4k | 4k |  ...     |
 * index:  0    1    2   ...    16   ...       n-15 n-14 n-13  ...  2n-30
 */
enum hv_gpadl_type {
	HV_GPADL_BUFFER,
	HV_GPADL_RING
};

/* Single-page buffer */
struct hv_page_buffer {
	u32 len;
	u32 offset;
	u64 pfn;
};

/* Multiple-page buffer */
struct hv_multipage_buffer {
	/* Length and Offset determines the # of pfns in the array */
	u32 len;
	u32 offset;
	u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
};

/*
 * Multiple-page buffer array; the pfn array is variable size:
 * The number of entries in the PFN array is determined by
 * "len" and "offset".
 */
struct hv_mpb_array {
	/* Length and Offset determines the # of pfns in the array */
	u32 len;
	u32 offset;
	u64 pfn_array[];
};

/* 0x18 includes the proprietary packet header */
#define MAX_PAGE_BUFFER_PACKET		(0x18 +			\
					(sizeof(struct hv_page_buffer) * \
					 MAX_PAGE_BUFFER_COUNT))
#define MAX_MULTIPAGE_BUFFER_PACKET	(0x18 +			\
					 sizeof(struct hv_multipage_buffer))

#pragma pack(pop)

struct hv_ring_buffer {
	/* Offset in bytes from the start of ring data below */
	u32 write_index;

/* Offset in bytes from the start of ring data below */
	u32 read_index;

u32 interrupt_mask;

/*
	 * WS2012/Win8 and later versions of Hyper-V implement interrupt
	 * driven flow management. The feature bit feat_pending_send_sz
	 * is set by the host on the host->guest ring buffer, and by the
	 * guest on the guest->host ring buffer.
	 *
	 * The meaning of the feature bit is a bit complex in that it has
	 * semantics that apply to both ring buffers.  If the guest sets
	 * the feature bit in the guest->host ring buffer, the guest is
	 * telling the host that:
	 * 1) It will set the pending_send_sz field in the guest->host ring
	 *    buffer when it is waiting for space to become available, and
	 * 2) It will read the pending_send_sz field in the host->guest
	 *    ring buffer and interrupt the host when it frees enough space
	 *
	 * Similarly, if the host sets the feature bit in the host->guest
	 * ring buffer, the host is telling the guest that:
	 * 1) It will set the pending_send_sz field in the host->guest ring
	 *    buffer when it is waiting for space to become available, and
	 * 2) It will read the pending_send_sz field in the guest->host
	 *    ring buffer and interrupt the guest when it frees enough space
	 *
	 * If either the guest or host does not set the feature bit that it
	 * owns, that guest or host must do polling if it encounters a full
	 * ring buffer, and not signal the other end with an interrupt.
	 */
	u32 pending_send_sz;
	u32 reserved1[12];
	union {
		struct {
			u32 feat_pending_send_sz:1;
		};
		u32 value;
	} feature_bits;

/* Pad it to PAGE_SIZE so that data starts on page boundary */
	u8	reserved2[PAGE_SIZE - 68];

/*
	 * Ring data starts here + RingDataStartOffset
	 * !!! DO NOT place any fields below this !!!
	 */
	u8 buffer[];
} __packed;

/*
 * If the requested ring buffer size is at least 8 times the size of the
 * header, steal space from the ring buffer for the header. Otherwise, add
 * space for the header so that is doesn't take too much of the ring buffer
 * space.
 *
 * The factor of 8 is somewhat arbitrary. The goal is to prevent adding a
 * relatively small header (4 Kbytes on x86) to a large-ish power-of-2 ring
 * buffer size (such as 128 Kbytes) and so end up making a nearly twice as
 * large allocation that will be almost half wasted. As a contrasting example,
 * on ARM64 with 64 Kbyte page size, we don't want to take 64 Kbytes for the
 * header from a 128 Kbyte allocation, leaving only 64 Kbytes for the ring.
 * In this latter case, we must add 64 Kbytes for the header and not worry
 * about what's wasted.
 */
#define VMBUS_HEADER_ADJ(payload_sz) \
	((payload_sz) >=  8 * sizeof(struct hv_ring_buffer) ? \
	0 : sizeof(struct hv_ring_buffer))

/* Calculate the proper size of a ringbuffer, it must be page-aligned */
#define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(VMBUS_HEADER_ADJ(payload_sz) + \
					       (payload_sz))

struct hv_ring_buffer_info {
	struct hv_ring_buffer *ring_buffer;
	u32 ring_size;			/* Include the shared header */
	struct reciprocal_value ring_size_div10_reciprocal;
	spinlock_t ring_lock;

u32 ring_datasize;		/* < ring_size */
	u32 priv_read_index;
	/*
	 * The ring buffer mutex lock. This lock prevents the ring buffer from
	 * being freed while the ring buffer is being accessed.
	 */
	struct mutex ring_buffer_mutex;

/* Buffer that holds a copy of an incoming host packet */
	void *pkt_buffer;
	u32 pkt_buffer_size;
};

static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi)
{
	u32 read_loc, write_loc, dsize, read;

dsize = rbi->ring_datasize;
	read_loc = rbi->ring_buffer->read_index;
	write_loc = READ_ONCE(rbi->ring_buffer->write_index);

read = write_loc >= read_loc ? (write_loc - read_loc) :
		(dsize - read_loc) + write_loc;

return read;
}

static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
{
	u32 read_loc, write_loc, dsize, write;

dsize = rbi->ring_datasize;
	read_loc = READ_ONCE(rbi->ring_buffer->read_index);
	write_loc = rbi->ring_buffer->write_index;

write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
		read_loc - write_loc;
	return write;
}

static inline u32 hv_get_avail_to_write_percent(
		const struct hv_ring_buffer_info *rbi)
{
	u32 avail_write = hv_get_bytes_to_write(rbi);

return reciprocal_divide(
			(avail_write  << 3) + (avail_write << 1),
			rbi->ring_size_div10_reciprocal);
}

/*
 * VMBUS version is 32 bit entity broken up into
 * two 16 bit quantities: major_number. minor_number.
 *
 * 0 . 13 (Windows Server 2008)
 * 1 . 1  (Windows 7)
 * 2 . 4  (Windows 8)
 * 3 . 0  (Windows 8 R2)
 * 4 . 0  (Windows 10)
 * 4 . 1  (Windows 10 RS3)
 * 5 . 0  (Newer Windows 10)
 * 5 . 1  (Windows 10 RS4)
 * 5 . 2  (Windows Server 2019, RS5)
 * 5 . 3  (Windows Server 2022)
 */

/* Make maximum size of pipe payload of 16K */
#define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)

/* Define PipeMode values. */
#define VMBUS_PIPE_TYPE_BYTE		0x00000000
#define VMBUS_PIPE_TYPE_MESSAGE		0x00000004

/* The size of the user defined data buffer for non-pipe offers. */
#define MAX_USER_DEFINED_BYTES		120

/* The size of the user defined data buffer for pipe offers. */
#define MAX_PIPE_USER_DEFINED_BYTES	116

/*
 * At the center of the Channel Management library is the Channel Offer. This
 * struct contains the fundamental information about an offer.
 */
struct vmbus_channel_offer {
	guid_t if_type;
	guid_t if_instance;

/*
	 * These two fields are not currently used.
	 */
	u64 reserved1;
	u64 reserved2;

u16 chn_flags;
	u16 mmio_megabytes;		/* in bytes * 1024 * 1024 */

union {
		/* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
		struct {
			unsigned char user_def[MAX_USER_DEFINED_BYTES];
		} std;

/*
		 * Pipes:
		 * The following structure is an integrated pipe protocol, which
		 * is implemented on top of standard user-defined data. Pipe
		 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
		 * use.
		 */
		struct {
			u32  pipe_mode;
			unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
		} pipe;
	} u;
	/*
	 * The sub_channel_index is defined in Win8: a value of zero means a
	 * primary channel and a value of non-zero means a sub-channel.
	 *
	 * Before Win8, the field is reserved, meaning it's always zero.
	 */
	u16 sub_channel_index;
	u16 reserved3;
} __packed;

/* Server Flags */
#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE	1
#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES	2
#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS		4
#define VMBUS_CHANNEL_NAMED_PIPE_MODE			0x10
#define VMBUS_CHANNEL_LOOPBACK_OFFER			0x100
#define VMBUS_CHANNEL_PARENT_OFFER			0x200
#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION	0x400
#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER		0x2000

struct vmpacket_descriptor {
	u16 type;
	u16 offset8;
	u16 len8;
	u16 flags;
	u64 trans_id;
} __packed;

struct vmpacket_header {
	u32 prev_pkt_start_offset;
	struct vmpacket_descriptor descriptor;
} __packed;

struct vmtransfer_page_range {
	u32 byte_count;
	u32 byte_offset;
} __packed;

struct vmtransfer_page_packet_header {
	struct vmpacket_descriptor d;
	u16 xfer_pageset_id;
	u8  sender_owns_set;
	u8 reserved;
	u32 range_cnt;
	struct vmtransfer_page_range ranges[];
} __packed;

struct vmgpadl_packet_header {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 reserved;
} __packed;

struct vmadd_remove_transfer_page_set {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u16 xfer_pageset_id;
	u16 reserved;
} __packed;

/*
 * This structure defines a range in guest physical space that can be made to
 * look virtually contiguous.
 */
struct gpa_range {
	u32 byte_count;
	u32 byte_offset;
	u64 pfn_array[];
};

/*
 * This is the format for an Establish Gpadl packet, which contains a handle by
 * which this GPADL will be known and a set of GPA ranges associated with it.
 * This can be converted to a MDL by the guest OS.  If there are multiple GPA
 * ranges, then the resulting MDL will be "chained," representing multiple VA
 * ranges.
 */
struct vmestablish_gpadl {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 range_cnt;
	struct gpa_range range[1];
} __packed;

/*
 * This is the format for a Teardown Gpadl packet, which indicates that the
 * GPADL handle in the Establish Gpadl packet will never be referenced again.
 */
struct vmteardown_gpadl {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 reserved;	/* for alignment to a 8-byte boundary */
} __packed;

/*
 * This is the format for a GPA-Direct packet, which contains a set of GPA
 * ranges, in addition to commands and/or data.
 */
struct vmdata_gpa_direct {
	struct vmpacket_descriptor d;
	u32 reserved;
	u32 range_cnt;
	struct gpa_range range[1];
} __packed;

/* This is the format for a Additional Data Packet. */
struct vmadditional_data {
	struct vmpacket_descriptor d;
	u64 total_bytes;
	u32 offset;
	u32 byte_cnt;
	unsigned char data[1];
} __packed;

union vmpacket_largest_possible_header {
	struct vmpacket_descriptor simple_hdr;
	struct vmtransfer_page_packet_header xfer_page_hdr;
	struct vmgpadl_packet_header gpadl_hdr;
	struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
	struct vmestablish_gpadl establish_gpadl_hdr;
	struct vmteardown_gpadl teardown_gpadl_hdr;
	struct vmdata_gpa_direct data_gpa_direct_hdr;
};

#define VMPACKET_DATA_START_ADDRESS(__packet)	\
	(void *)(((unsigned char *)__packet) +	\
	 ((struct vmpacket_descriptor)__packet)->offset8 * 8)

#define VMPACKET_DATA_LENGTH(__packet)		\
	((((struct vmpacket_descriptor)__packet)->len8 -	\
	  ((struct vmpacket_descriptor)__packet)->offset8) * 8)

#define VMPACKET_TRANSFER_MODE(__packet)	\
	(((struct IMPACT)__packet)->type)

enum vmbus_packet_type {
	VM_PKT_INVALID				= 0x0,
	VM_PKT_SYNCH				= 0x1,
	VM_PKT_ADD_XFER_PAGESET			= 0x2,
	VM_PKT_RM_XFER_PAGESET			= 0x3,
	VM_PKT_ESTABLISH_GPADL			= 0x4,
	VM_PKT_TEARDOWN_GPADL			= 0x5,
	VM_PKT_DATA_INBAND			= 0x6,
	VM_PKT_DATA_USING_XFER_PAGES		= 0x7,
	VM_PKT_DATA_USING_GPADL			= 0x8,
	VM_PKT_DATA_USING_GPA_DIRECT		= 0x9,
	VM_PKT_CANCEL_REQUEST			= 0xa,
	VM_PKT_COMP				= 0xb,
	VM_PKT_DATA_USING_ADDITIONAL_PKT	= 0xc,
	VM_PKT_ADDITIONAL_DATA			= 0xd
};

#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED	1

/* Version 1 messages */
enum vmbus_channel_message_type {
	CHANNELMSG_INVALID			=  0,
	CHANNELMSG_OFFERCHANNEL		=  1,
	CHANNELMSG_RESCIND_CHANNELOFFER	=  2,
	CHANNELMSG_REQUESTOFFERS		=  3,
	CHANNELMSG_ALLOFFERS_DELIVERED	=  4,
	CHANNELMSG_OPENCHANNEL		=  5,
	CHANNELMSG_OPENCHANNEL_RESULT		=  6,
	CHANNELMSG_CLOSECHANNEL		=  7,
	CHANNELMSG_GPADL_HEADER		=  8,
	CHANNELMSG_GPADL_BODY			=  9,
	CHANNELMSG_GPADL_CREATED		= 10,
	CHANNELMSG_GPADL_TEARDOWN		= 11,
	CHANNELMSG_GPADL_TORNDOWN		= 12,
	CHANNELMSG_RELID_RELEASED		= 13,
	CHANNELMSG_INITIATE_CONTACT		= 14,
	CHANNELMSG_VERSION_RESPONSE		= 15,
	CHANNELMSG_UNLOAD			= 16,
	CHANNELMSG_UNLOAD_RESPONSE		= 17,
	CHANNELMSG_18				= 18,
	CHANNELMSG_19				= 19,
	CHANNELMSG_20				= 20,
	CHANNELMSG_TL_CONNECT_REQUEST		= 21,
	CHANNELMSG_MODIFYCHANNEL		= 22,
	CHANNELMSG_TL_CONNECT_RESULT		= 23,
	CHANNELMSG_MODIFYCHANNEL_RESPONSE	= 24,
	CHANNELMSG_COUNT
};

/* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
#define INVALID_RELID	U32_MAX

struct vmbus_channel_message_header {
	enum vmbus_channel_message_type msgtype;
	u32 padding;
} __packed;

/* Query VMBus Version parameters */
struct vmbus_channel_query_vmbus_version {
	struct vmbus_channel_message_header header;
	u32 version;
} __packed;

/* VMBus Version Supported parameters */
struct vmbus_channel_version_supported {
	struct vmbus_channel_message_header header;
	u8 version_supported;
} __packed;

/* Offer Channel parameters */
struct vmbus_channel_offer_channel {
	struct vmbus_channel_message_header header;
	struct vmbus_channel_offer offer;
	u32 child_relid;
	u8 monitorid;
	/*
	 * win7 and beyond splits this field into a bit field.
	 */
	u8 monitor_allocated:1;
	u8 reserved:7;
	/*
	 * These are new fields added in win7 and later.
	 * Do not access these fields without checking the
	 * negotiated protocol.
	 *
	 * If "is_dedicated_interrupt" is set, we must not set the
	 * associated bit in the channel bitmap while sending the
	 * interrupt to the host.
	 *
	 * connection_id is to be used in signaling the host.
	 */
	u16 is_dedicated_interrupt:1;
	u16 reserved1:15;
	u32 connection_id;
} __packed;

/* Rescind Offer parameters */
struct vmbus_channel_rescind_offer {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

/*
 * Request Offer -- no parameters, SynIC message contains the partition ID
 * Set Snoop -- no parameters, SynIC message contains the partition ID
 * Clear Snoop -- no parameters, SynIC message contains the partition ID
 * All Offers Delivered -- no parameters, SynIC message contains the partition
 *		           ID
 * Flush Client -- no parameters, SynIC message contains the partition ID
 */

/* Open Channel parameters */
struct vmbus_channel_open_channel {
	struct vmbus_channel_message_header header;

/* Identifies the specific VMBus channel that is being opened. */
	u32 child_relid;

/* ID making a particular open request at a channel offer unique. */
	u32 openid;

/* GPADL for the channel's ring buffer. */
	u32 ringbuffer_gpadlhandle;

/*
	 * Starting with win8, this field will be used to specify
	 * the target virtual processor on which to deliver the interrupt for
	 * the host to guest communication.
	 * Prior to win8, incoming channel interrupts would only
	 * be delivered on cpu 0. Setting this value to 0 would
	 * preserve the earlier behavior.
	 */
	u32 target_vp;

/*
	 * The upstream ring buffer begins at offset zero in the memory
	 * described by RingBufferGpadlHandle. The downstream ring buffer
	 * follows it at this offset (in pages).
	 */
	u32 downstream_ringbuffer_pageoffset;

/* User-specific data to be passed along to the server endpoint. */
	unsigned char userdata[MAX_USER_DEFINED_BYTES];
} __packed;

/* Open Channel Result parameters */
struct vmbus_channel_open_result {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 openid;
	u32 status;
} __packed;

/* Modify Channel Result parameters */
struct vmbus_channel_modifychannel_response {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 status;
} __packed;

/* Close channel parameters; */
struct vmbus_channel_close_channel {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

/* Channel Message GPADL */
#define GPADL_TYPE_RING_BUFFER		1
#define GPADL_TYPE_SERVER_SAVE_AREA	2
#define GPADL_TYPE_TRANSACTION		8

/*
 * The number of PFNs in a GPADL message is defined by the number of
 * pages that would be spanned by ByteCount and ByteOffset.  If the
 * implied number of PFNs won't fit in this packet, there will be a
 * follow-up packet that contains more.
 */
struct vmbus_channel_gpadl_header {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
	u16 range_buflen;
	u16 rangecount;
	struct gpa_range range[];
} __packed;

/* This is the followup packet that contains more PFNs. */
struct vmbus_channel_gpadl_body {
	struct vmbus_channel_message_header header;
	u32 msgnumber;
	u32 gpadl;
	u64 pfn[];
} __packed;

struct vmbus_channel_gpadl_created {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
	u32 creation_status;
} __packed;

struct vmbus_channel_gpadl_teardown {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
} __packed;

struct vmbus_channel_gpadl_torndown {
	struct vmbus_channel_message_header header;
	u32 gpadl;
} __packed;

struct vmbus_channel_relid_released {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

struct vmbus_channel_initiate_contact {
	struct vmbus_channel_message_header header;
	u32 vmbus_version_requested;
	u32 target_vcpu; /* The VCPU the host should respond to */
	union {
		u64 interrupt_page;
		struct {
			u8	msg_sint;
			u8	padding1[3];
			u32	padding2;
		};
	};
	u64 monitor_page1;
	u64 monitor_page2;
} __packed;

/* Hyper-V socket: guest's connect()-ing to host */
struct vmbus_channel_tl_connect_request {
	struct vmbus_channel_message_header header;
	guid_t guest_endpoint_id;
	guid_t host_service_id;
} __packed;

/* Modify Channel parameters, cf. vmbus_send_modifychannel() */
struct vmbus_channel_modifychannel {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 target_vp;
} __packed;

struct vmbus_channel_version_response {
	struct vmbus_channel_message_header header;
	u8 version_supported;

u8 connection_state;
	u16 padding;

/*
	 * On new hosts that support VMBus protocol 5.0, we must use
	 * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
	 * and for subsequent messages, we must use the Message Connection ID
	 * field in the host-returned Version Response Message.
	 *
	 * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
	 */
	u32 msg_conn_id;
} __packed;

enum vmbus_channel_state {
	CHANNEL_OFFER_STATE,
	CHANNEL_OPENING_STATE,
	CHANNEL_OPEN_STATE,
	CHANNEL_OPENED_STATE,
};

/*
 * Represents each channel msg on the vmbus connection This is a
 * variable-size data structure depending on the msg type itself
 */
struct vmbus_channel_msginfo {
	/* Bookkeeping stuff */
	struct list_head msglistentry;

/* So far, this is only used to handle gpadl body message */
	struct list_head submsglist;

/* Synchronize the request/response if needed */
	struct completion  waitevent;
	struct vmbus_channel *waiting_channel;
	union {
		struct vmbus_channel_version_supported version_supported;
		struct vmbus_channel_open_result open_result;
		struct vmbus_channel_gpadl_torndown gpadl_torndown;
		struct vmbus_channel_gpadl_created gpadl_created;
		struct vmbus_channel_version_response version_response;
		struct vmbus_channel_modifychannel_response modify_response;
	} response;

u32 msgsize;
	/*
	 * The channel message that goes out on the "wire".
	 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
	 */
	unsigned char msg[];
};

struct vmbus_close_msg {
	struct vmbus_channel_msginfo info;
	struct vmbus_channel_close_channel msg;
};

/* Define connection identifier type. */
union hv_connection_id {
	u32 asu32;
	struct {
		u32 id:24;
		u32 reserved:8;
	} u;
};

enum vmbus_device_type {
	HV_IDE = 0,
	HV_SCSI,
	HV_FC,
	HV_NIC,
	HV_ND,
	HV_PCIE,
	HV_FB,
	HV_KBD,
	HV_MOUSE,
	HV_KVP,
	HV_TS,
	HV_HB,
	HV_SHUTDOWN,
	HV_FCOPY,
	HV_BACKUP,
	HV_DM,
	HV_UNKNOWN,
};

/*
 * Provides request ids for VMBus. Encapsulates guest memory
 * addresses and stores the next available slot in req_arr
 * to generate new ids in constant time.
 */
struct vmbus_requestor {
	u64 *req_arr;
	unsigned long *req_bitmap; /* is a given slot available? */
	u32 size;
	u64 next_request_id;
	spinlock_t req_lock; /* provides atomicity */
};

#define VMBUS_NO_RQSTOR U64_MAX
#define VMBUS_RQST_ERROR (U64_MAX - 1)
/* NetVSC-specific */
#define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
/* StorVSC-specific */
#define VMBUS_RQST_INIT (U64_MAX - 2)
#define VMBUS_RQST_RESET (U64_MAX - 3)

struct vmbus_device {
	/* preferred ring buffer size in KB, 0 means no preferred size for this device */
	size_t pref_ring_size;
	u16  dev_type;
	guid_t guid;
	bool perf_device;
	bool allowed_in_isolated;
};

#define VMBUS_DEFAULT_MAX_PKT_SIZE 4096

struct vmbus_channel {
	struct list_head listentry;

struct hv_device *device_obj;

enum vmbus_channel_state state;

struct vmbus_channel_offer_channel offermsg;
	/*
	 * These are based on the OfferMsg.MonitorId.
	 * Save it here for easy access.
	 */
	u8 monitor_grp;
	u8 monitor_bit;

bool rescind; /* got rescind msg */
	bool rescind_ref; /* got rescind msg, got channel reference */
	struct completion rescind_event;

u32 ringbuffer_gpadlhandle;

/* Allocated memory for ring buffer */
	struct page *ringbuffer_page;
	u32 ringbuffer_pagecount;
	u32 ringbuffer_send_offset;
	struct hv_ring_buffer_info outbound;	/* send to parent */
	struct hv_ring_buffer_info inbound;	/* receive from parent */

struct vmbus_close_msg close_msg;

/* Statistics */
	u64	interrupts;	/* Host to Guest interrupts */
	u64	sig_events;	/* Guest to Host events */

/*
	 * Guest to host interrupts caused by the outbound ring buffer changing
	 * from empty to not empty.
	 */
	u64 intr_out_empty;

/*
	 * Indicates that a full outbound ring buffer was encountered. The flag
	 * is set to true when a full outbound ring buffer is encountered and
	 * set to false when a write to the outbound ring buffer is completed.
	 */
	bool out_full_flag;

/* Channel callback's invoked in softirq context */
	struct tasklet_struct callback_event;
	void (*onchannel_callback)(void *context);
	void *channel_callback_context;

void (*change_target_cpu_callback)(struct vmbus_channel *channel,
			u32 old, u32 new);

/*
	 * Synchronize channel scheduling and channel removal; see the inline
	 * comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
	 */
	spinlock_t sched_lock;

/*
	 * A channel can be marked for one of three modes of reading:
	 *   BATCHED - callback called from taslket and should read
	 *            channel until empty. Interrupts from the host
	 *            are masked while read is in process (default).
	 *   DIRECT - callback called from tasklet (softirq).
	 *   ISR - callback called in interrupt context and must
	 *         invoke its own deferred processing.
	 *         Host interrupts are disabled and must be re-enabled
	 *         when ring is empty.
	 */
	enum hv_callback_mode {
		HV_CALL_BATCHED,
		HV_CALL_DIRECT,
		HV_CALL_ISR
	} callback_mode;

bool is_dedicated_interrupt;
	u64 sig_event;

/*
	 * Starting with win8, this field will be used to specify the
	 * target CPU on which to deliver the interrupt for the host
	 * to guest communication.
	 *
	 * Prior to win8, incoming channel interrupts would only be
	 * delivered on CPU 0. Setting this value to 0 would preserve
	 * the earlier behavior.
	 */
	u32 target_cpu;
	/*
	 * Support for sub-channels. For high performance devices,
	 * it will be useful to have multiple sub-channels to support
	 * a scalable communication infrastructure with the host.
	 * The support for sub-channels is implemented as an extension
	 * to the current infrastructure.
	 * The initial offer is considered the primary channel and this
	 * offer message will indicate if the host supports sub-channels.
	 * The guest is free to ask for sub-channels to be offered and can
	 * open these sub-channels as a normal "primary" channel. However,
	 * all sub-channels will have the same type and instance guids as the
	 * primary channel. Requests sent on a given channel will result in a
	 * response on the same channel.
	 */

/*
	 * Sub-channel creation callback. This callback will be called in
	 * process context when a sub-channel offer is received from the host.
	 * The guest can open the sub-channel in the context of this callback.
	 */
	void (*sc_creation_callback)(struct vmbus_channel *new_sc);

/*
	 * Channel rescind callback. Some channels (the hvsock ones), need to
	 * register a callback which is invoked in vmbus_onoffer_rescind().
	 */
	void (*chn_rescind_callback)(struct vmbus_channel *channel);

/*
	 * All Sub-channels of a primary channel are linked here.
	 */
	struct list_head sc_list;
	/*
	 * The primary channel this sub-channel belongs to.
	 * This will be NULL for the primary channel.
	 */
	struct vmbus_channel *primary_channel;
	/*
	 * Support per-channel state for use by vmbus drivers.
	 */
	void *per_channel_state;

/*
	 * Defer freeing channel until after all cpu's have
	 * gone through grace period.
	 */
	struct rcu_head rcu;

/*
	 * For sysfs per-channel properties.
	 */
	struct kobject			kobj;

/*
	 * For performance critical channels (storage, networking
	 * etc,), Hyper-V has a mechanism to enhance the throughput
	 * at the expense of latency:
	 * When the host is to be signaled, we just set a bit in a shared page
	 * and this bit will be inspected by the hypervisor within a certain
	 * window and if the bit is set, the host will be signaled. The window
	 * of time is the monitor latency - currently around 100 usecs. This
	 * mechanism improves throughput by:
	 *
	 * A) Making the host more efficient - each time it wakes up,
	 *    potentially it will process morev number of packets. The
	 *    monitor latency allows a batch to build up.
	 * B) By deferring the hypercall to signal, we will also minimize
	 *    the interrupts.
	 *
	 * Clearly, these optimizations improve throughput at the expense of
	 * latency. Furthermore, since the channel is shared for both
	 * control and data messages, control messages currently suffer
	 * unnecessary latency adversely impacting performance and boot
	 * time. To fix this issue, permit tagging the channel as being
	 * in "low latency" mode. In this mode, we will bypass the monitor
	 * mechanism.
	 */
	bool low_latency;

bool probe_done;

/*
	 * Cache the device ID here for easy access; this is useful, in
	 * particular, in situations where the channel's device_obj has
	 * not been allocated/initialized yet.
	 */
	u16 device_id;

/*
	 * We must offload the handling of the primary/sub channels
	 * from the single-threaded vmbus_connection.work_queue to
	 * two different workqueue, otherwise we can block
	 * vmbus_connection.work_queue and hang: see vmbus_process_offer().
	 */
	struct work_struct add_channel_work;

/*
	 * Guest to host interrupts caused by the inbound ring buffer changing
	 * from full to not full while a packet is waiting.
	 */
	u64 intr_in_full;

/*
	 * The total number of write operations that encountered a full
	 * outbound ring buffer.
	 */
	u64 out_full_total;

/*
	 * The number of write operations that were the first to encounter a
	 * full outbound ring buffer.
	 */
	u64 out_full_first;

/* enabling/disabling fuzz testing on the channel (default is false)*/
	bool fuzz_testing_state;

/*
	 * Interrupt delay will delay the guest from emptying the ring buffer
	 * for a specific amount of time. The delay is in microseconds and will
	 * be between 1 to a maximum of 1000, its default is 0 (no delay).
	 * The  Message delay will delay guest reading on a per message basis
	 * in microseconds between 1 to 1000 with the default being 0
	 * (no delay).
	 */
	u32 fuzz_testing_interrupt_delay;
	u32 fuzz_testing_message_delay;

/* callback to generate a request ID from a request address */
	u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
	/* callback to retrieve a request address from a request ID */
	u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);

/* request/transaction ids for VMBus */
	struct vmbus_requestor requestor;
	u32 rqstor_size;

/* The max size of a packet on this channel */
	u32 max_pkt_size;
};

u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);

static inline bool is_hvsock_channel(const struct vmbus_channel *c)
{
	return !!(c->offermsg.offer.chn_flags &
		  VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
}

static inline bool is_sub_channel(const struct vmbus_channel *c)
{
	return c->offermsg.offer.sub_channel_index != 0;
}

static inline void set_channel_read_mode(struct vmbus_channel *c,
					enum hv_callback_mode mode)
{
	c->callback_mode = mode;
}

static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
{
	c->per_channel_state = s;
}

static inline void *get_per_channel_state(struct vmbus_channel *c)
{
	return c->per_channel_state;
}

static inline void set_channel_pending_send_size(struct vmbus_channel *c,
						 u32 size)
{
	unsigned long flags;

if (size) {
		spin_lock_irqsave(&c->outbound.ring_lock, flags);
		++c->out_full_total;

if (!c->out_full_flag) {
			++c->out_full_first;
			c->out_full_flag = true;
		}
		spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
	} else {
		c->out_full_flag = false;
	}

c->outbound.ring_buffer->pending_send_sz = size;
}

void vmbus_onmessage(struct vmbus_channel_message_header *hdr);

int vmbus_request_offers(void);

/*
 * APIs for managing sub-channels.
 */

void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
			void (*sc_cr_cb)(struct vmbus_channel *new_sc));

void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
		void (*chn_rescind_cb)(struct vmbus_channel *));

/*
 * Check if sub-channels have already been offerred. This API will be useful
 * when the driver is unloaded after establishing sub-channels. In this case,
 * when the driver is re-loaded, the driver would have to check if the
 * subchannels have already been established before attempting to request
 * the creation of sub-channels.
 * This function returns TRUE to indicate that subchannels have already been
 * created.
 * This function should be invoked after setting the callback function for
 * sub-channel creation.
 */
bool vmbus_are_subchannels_present(struct vmbus_channel *primary);

/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_page_buffer {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;
	struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
} __packed;

/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_multipage_buffer {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;		/* Always 1 in this case */
	struct hv_multipage_buffer range;
} __packed;

/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_packet_mpb_array {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;         /* Always 1 in this case */
	struct hv_mpb_array range;
} __packed;

int vmbus_alloc_ring(struct vmbus_channel *channel,
		     u32 send_size, u32 recv_size);
void vmbus_free_ring(struct vmbus_channel *channel);

int vmbus_connect_ring(struct vmbus_channel *channel,
		       void (*onchannel_callback)(void *context),
		       void *context);
int vmbus_disconnect_ring(struct vmbus_channel *channel);

extern int vmbus_open(struct vmbus_channel *channel,
			    u32 send_ringbuffersize,
			    u32 recv_ringbuffersize,
			    void *userdata,
			    u32 userdatalen,
			    void (*onchannel_callback)(void *context),
			    void *context);

extern void vmbus_close(struct vmbus_channel *channel);

extern int vmbus_sendpacket(struct vmbus_channel *channel,
				  void *buffer,
				  u32 bufferLen,
				  u64 requestid,
				  enum vmbus_packet_type type,
				  u32 flags);

extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
					    struct hv_page_buffer pagebuffers[],
					    u32 pagecount,
					    void *buffer,
					    u32 bufferlen,
					    u64 requestid);

extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
				     struct vmbus_packet_mpb_array *mpb,
				     u32 desc_size,
				     void *buffer,
				     u32 bufferlen,
				     u64 requestid);

extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
				      void *kbuffer,
				      u32 size,
				      u32 *gpadl_handle);

extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
				     u32 gpadl_handle);

void vmbus_reset_channel_cb(struct vmbus_channel *channel);

extern int vmbus_recvpacket(struct vmbus_channel *channel,
				  void *buffer,
				  u32 bufferlen,
				  u32 *buffer_actual_len,
				  u64 *requestid);

extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
				     void *buffer,
				     u32 bufferlen,
				     u32 *buffer_actual_len,
				     u64 *requestid);

extern void vmbus_ontimer(unsigned long data);

/* Base driver object */
struct hv_driver {
	const char *name;

/*
	 * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
	 * channel flag, actually doesn't mean a synthetic device because the
	 * offer's if_type/if_instance can change for every new hvsock
	 * connection.
	 *
	 * However, to facilitate the notification of new-offer/rescind-offer
	 * from vmbus driver to hvsock driver, we can handle hvsock offer as
	 * a special vmbus device, and hence we need the below flag to
	 * indicate if the driver is the hvsock driver or not: we need to
	 * specially treat the hvosck offer & driver in vmbus_match().
	 */
	bool hvsock;

/* the device type supported by this driver */
	guid_t dev_type;
	const struct hv_vmbus_device_id *id_table;

struct device_driver driver;

/* dynamic device GUID's */
	struct  {
		spinlock_t lock;
		struct list_head list;
	} dynids;

int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
	int (*remove)(struct hv_device *);
	void (*shutdown)(struct hv_device *);

int (*suspend)(struct hv_device *);
	int (*resume)(struct hv_device *);

};

/* Base device object */
struct hv_device {
	/* the device type id of this device */
	guid_t dev_type;

/* the device instance id of this device */
	guid_t dev_instance;
	u16 vendor_id;
	u16 device_id;

struct device device;
	char *driver_override; /* Driver name to force a match */

struct vmbus_channel *channel;
	struct kset	     *channels_kset;

/* place holder to keep track of the dir for hv device in debugfs */
	struct dentry *debug_dir;

};

static inline struct hv_device *device_to_hv_device(struct device *d)
{
	return container_of(d, struct hv_device, device);
}

static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
{
	return container_of(d, struct hv_driver, driver);
}

static inline void hv_set_drvdata(struct hv_device *dev, void *data)
{
	dev_set_drvdata(&dev->device, data);
}

static inline void *hv_get_drvdata(struct hv_device *dev)
{
	return dev_get_drvdata(&dev->device);
}

struct hv_ring_buffer_debug_info {
	u32 current_interrupt_mask;
	u32 current_read_index;
	u32 current_write_index;
	u32 bytes_avail_toread;
	u32 bytes_avail_towrite;
};

int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
				struct hv_ring_buffer_debug_info *debug_info);

bool hv_ringbuffer_spinlock_busy(struct vmbus_channel *channel);

/* Vmbus interface */
#define vmbus_driver_register(driver)	\
	__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
					 struct module *owner,
					 const char *mod_name);
void vmbus_driver_unregister(struct hv_driver *hv_driver);

void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);

int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
			resource_size_t min, resource_size_t max,
			resource_size_t size, resource_size_t align,
			bool fb_overlap_ok);
void vmbus_free_mmio(resource_size_t start, resource_size_t size);

/*
 * GUID definitions of various offer types - services offered to the guest.
 */

/*
 * Network GUID
 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
 */
#define HV_NIC_GUID \
	.guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
			  0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)

/*
 * IDE GUID
 * {32412632-86cb-44a2-9b5c-50d1417354f5}
 */
#define HV_IDE_GUID \
	.guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
			  0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)

/*
 * SCSI GUID
 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
 */
#define HV_SCSI_GUID \
	.guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
			  0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)

/*
 * Shutdown GUID
 * {0e0b6031-5213-4934-818b-38d90ced39db}
 */
#define HV_SHUTDOWN_GUID \
	.guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
			  0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)

/*
 * Time Synch GUID
 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
 */
#define HV_TS_GUID \
	.guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
			  0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)

/*
 * Heartbeat GUID
 * {57164f39-9115-4e78-ab55-382f3bd5422d}
 */
#define HV_HEART_BEAT_GUID \
	.guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
			  0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)

/*
 * KVP GUID
 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
 */
#define HV_KVP_GUID \
	.guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
			  0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)

/*
 * Dynamic memory GUID
 * {525074dc-8985-46e2-8057-a307dc18a502}
 */
#define HV_DM_GUID \
	.guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
			  0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)

/*
 * Mouse GUID
 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
 */
#define HV_MOUSE_GUID \
	.guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
			  0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)

/*
 * Keyboard GUID
 * {f912ad6d-2b17-48ea-bd65-f927a61c7684}
 */
#define HV_KBD_GUID \
	.guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
			  0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)

/*
 * VSS (Backup/Restore) GUID
 */
#define HV_VSS_GUID \
	.guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
			  0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
/*
 * Synthetic Video GUID
 * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
 */
#define HV_SYNTHVID_GUID \
	.guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
			  0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)

/*
 * Synthetic FC GUID
 * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
 */
#define HV_SYNTHFC_GUID \
	.guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
			  0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)

/*
 * Guest File Copy Service
 * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
 */

#define HV_FCOPY_GUID \
	.guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
			  0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)

/*
 * NetworkDirect. This is the guest RDMA service.
 * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
 */
#define HV_ND_GUID \
	.guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
			  0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)

/*
 * PCI Express Pass Through
 * {44C4F61D-4444-4400-9D52-802E27EDE19F}
 */

#define HV_PCIE_GUID \
	.guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
			  0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)

/*
 * Linux doesn't support the 3 devices: the first two are for
 * Automatic Virtual Machine Activation, and the third is for
 * Remote Desktop Virtualization.
 * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
 * {3375baf4-9e15-4b30-b765-67acb10d607b}
 * {276aacf4-ac15-426c-98dd-7521ad3f01fe}
 */

#define HV_AVMA1_GUID \
	.guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
			  0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)

#define HV_AVMA2_GUID \
	.guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
			  0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)

#define HV_RDV_GUID \
	.guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
			  0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)

/*
 * Common header for Hyper-V ICs
 */

#define ICMSGTYPE_NEGOTIATE		0
#define ICMSGTYPE_HEARTBEAT		1
#define ICMSGTYPE_KVPEXCHANGE		2
#define ICMSGTYPE_SHUTDOWN		3
#define ICMSGTYPE_TIMESYNC		4
#define ICMSGTYPE_VSS			5
#define ICMSGTYPE_FCOPY			7

#define ICMSGHDRFLAG_TRANSACTION	1
#define ICMSGHDRFLAG_REQUEST		2
#define ICMSGHDRFLAG_RESPONSE		4

/*
 * While we want to handle util services as regular devices,
 * there is only one instance of each of these services; so
 * we statically allocate the service specific state.
 */

struct hv_util_service {
	u8 *recv_buffer;
	void *channel;
	void (*util_cb)(void *);
	int (*util_init)(struct hv_util_service *);
	int (*util_init_transport)(void);
	void (*util_deinit)(void);
	int (*util_pre_suspend)(void);
	int (*util_pre_resume)(void);
};

struct vmbuspipe_hdr {
	u32 flags;
	u32 msgsize;
} __packed;

struct ic_version {
	u16 major;
	u16 minor;
} __packed;

struct icmsg_hdr {
	struct ic_version icverframe;
	u16 icmsgtype;
	struct ic_version icvermsg;
	u16 icmsgsize;
	u32 status;
	u8 ictransaction_id;
	u8 icflags;
	u8 reserved[2];
} __packed;

#define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
#define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
#define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
	(ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
	 (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))

struct icmsg_negotiate {
	u16 icframe_vercnt;
	u16 icmsg_vercnt;
	u32 reserved;
	struct ic_version icversion_data[]; /* any size array */
} __packed;

struct shutdown_msg_data {
	u32 reason_code;
	u32 timeout_seconds;
	u32 flags;
	u8  display_message[2048];
} __packed;

struct heartbeat_msg_data {
	u64 seq_num;
	u32 reserved[8];
} __packed;

/* Time Sync IC defs */
#define ICTIMESYNCFLAG_PROBE	0
#define ICTIMESYNCFLAG_SYNC	1
#define ICTIMESYNCFLAG_SAMPLE	2

#ifdef __x86_64__
#define WLTIMEDELTA	116444736000000000L	/* in 100ns unit */
#else
#define WLTIMEDELTA	116444736000000000LL
#endif

struct ictimesync_data {
	u64 parenttime;
	u64 childtime;
	u64 roundtriptime;
	u8 flags;
} __packed;

struct ictimesync_ref_data {
	u64 parenttime;
	u64 vmreferencetime;
	u8 flags;
	char leapflags;
	char stratum;
	u8 reserved[3];
} __packed;

struct hyperv_service_callback {
	u8 msg_type;
	char *log_msg;
	guid_t data;
	struct vmbus_channel *channel;
	void (*callback)(void *context);
};

#define MAX_SRV_VER	0x7ffffff
extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
				const int *fw_version, int fw_vercnt,
				const int *srv_version, int srv_vercnt,
				int *nego_fw_version, int *nego_srv_version);

void hv_process_channel_removal(struct vmbus_channel *channel);

void vmbus_setevent(struct vmbus_channel *channel);
/*
 * Negotiated version with the Host.
 */

extern __u32 vmbus_proto_version;

int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
				  const guid_t *shv_host_servie_id);
int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp);
void vmbus_set_event(struct vmbus_channel *channel);

/* Get the start of the ring buffer. */
static inline void *
hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
{
	return ring_info->ring_buffer->buffer;
}

/*
 * Mask off host interrupt callback notifications
 */
static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
{
	rbi->ring_buffer->interrupt_mask = 1;

/* make sure mask update is not reordered */
	virt_mb();
}

/*
 * Re-enable host callback and return number of outstanding bytes
 */
static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
{

rbi->ring_buffer->interrupt_mask = 0;

/* make sure mask update is not reordered */
	virt_mb();

/*
	 * Now check to see if the ring buffer is still empty.
	 * If it is not, we raced and we need to process new
	 * incoming messages.
	 */
	return hv_get_bytes_to_read(rbi);
}

/*
 * An API to support in-place processing of incoming VMBUS packets.
 */

/* Get data payload associated with descriptor */
static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc)
{
	return (void *)((unsigned long)desc + (desc->offset8 << 3));
}

/* Get data size associated with descriptor */
static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
{
	return (desc->len8 << 3) - (desc->offset8 << 3);
}

struct vmpacket_descriptor *
hv_pkt_iter_first_raw(struct vmbus_channel *channel);

struct vmpacket_descriptor *
hv_pkt_iter_first(struct vmbus_channel *channel);

struct vmpacket_descriptor *
__hv_pkt_iter_next(struct vmbus_channel *channel,
		   const struct vmpacket_descriptor *pkt,
		   bool copy);

void hv_pkt_iter_close(struct vmbus_channel *channel);

static inline struct vmpacket_descriptor *
hv_pkt_iter_next_pkt(struct vmbus_channel *channel,
		     const struct vmpacket_descriptor *pkt,
		     bool copy)
{
	struct vmpacket_descriptor *nxt;

nxt = __hv_pkt_iter_next(channel, pkt, copy);
	if (!nxt)
		hv_pkt_iter_close(channel);

return nxt;
}

/*
 * Get next packet descriptor without copying it out of the ring buffer
 * If at end of list, return NULL and update host.
 */
static inline struct vmpacket_descriptor *
hv_pkt_iter_next_raw(struct vmbus_channel *channel,
		     const struct vmpacket_descriptor *pkt)
{
	return hv_pkt_iter_next_pkt(channel, pkt, false);
}

/*
 * Get next packet descriptor from iterator
 * If at end of list, return NULL and update host.
 */
static inline struct vmpacket_descriptor *
hv_pkt_iter_next(struct vmbus_channel *channel,
		 const struct vmpacket_descriptor *pkt)
{
	return hv_pkt_iter_next_pkt(channel, pkt, true);
}

#define foreach_vmbus_pkt(pkt, channel) \
	for (pkt = hv_pkt_iter_first(channel); pkt; \
	    pkt = hv_pkt_iter_next(channel, pkt))

/*
 * Interface for passing data between SR-IOV PF and VF drivers. The VF driver
 * sends requests to read and write blocks. Each block must be 128 bytes or
 * smaller. Optionally, the VF driver can register a callback function which
 * will be invoked when the host says that one or more of the first 64 block
 * IDs is "invalid" which means that the VF driver should reread them.
 */
#define HV_CONFIG_BLOCK_SIZE_MAX 128

int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
			unsigned int block_id, unsigned int *bytes_returned);
int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
			 unsigned int block_id);
int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
				void (*block_invalidate)(void *context,
							 u64 block_mask));

struct hyperv_pci_block_ops {
	int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
			  unsigned int block_id, unsigned int *bytes_returned);
	int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
			   unsigned int block_id);
	int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
				  void (*block_invalidate)(void *context,
							   u64 block_mask));
};

extern struct hyperv_pci_block_ops hvpci_block_ops;

static inline unsigned long virt_to_hvpfn(void *addr)
{
	phys_addr_t paddr;

if (is_vmalloc_addr(addr))
		paddr = page_to_phys(vmalloc_to_page(addr)) +
				     offset_in_page(addr);
	else
		paddr = __pa(addr);

return  paddr >> HV_HYP_PAGE_SHIFT;
}

#define NR_HV_HYP_PAGES_IN_PAGE	(PAGE_SIZE / HV_HYP_PAGE_SIZE)
#define offset_in_hvpage(ptr)	((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
#define HVPFN_UP(x)	(((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
#define HVPFN_DOWN(x)	((x) >> HV_HYP_PAGE_SHIFT)
#define page_to_hvpfn(page)	(page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)

#endif /* _HYPERV_H */

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