FM / linux

/usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/include/linux/

/usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/include/linux

Name	Size	Mode	Actions
amba/	-	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
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
hsi/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	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
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
uwb/	-	0755	rm
wimax/	-	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	43130	0644	edit dl rm
acpi_apmt.h	367	0644	edit dl rm
acpi_dma.h	3300	0644	edit dl rm
acpi_iort.h	3235	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3908	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1772	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1875	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6931	0644	edit dl rm
amd-pstate.h	3356	0644	edit dl rm
anon_inodes.h	494	0644	edit dl rm
aperture.h	1619	0644	edit dl rm
apm-emulation.h	1575	0644	edit dl rm
apm_bios.h	2746	0644	edit dl rm
apple-gmux.h	1459	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	1983	0644	edit dl rm
arm-cci.h	2058	0644	edit dl rm
arm-smccc.h	16066	0644	edit dl rm
arm_sdei.h	2641	0644	edit dl rm
ascii85.h	532	0644	edit dl rm
asn1.h	2039	0644	edit dl rm
asn1_ber_bytecode.h	2783	0644	edit dl rm
asn1_decoder.h	675	0644	edit dl rm
assoc_array.h	3156	0644	edit dl rm
assoc_array_priv.h	5630	0644	edit dl rm
async.h	4591	0644	edit dl rm
async_tx.h	7487	0644	edit dl rm
ata.h	33980	0644	edit dl rm
atalk.h	4550	0644	edit dl rm
ata_platform.h	729	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10457	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1502	0644	edit dl rm
atmel_tc.h	11600	0644	edit dl rm
atm_suni.h	253	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	37546	0644	edit dl rm
attribute_container.h	2799	0644	edit dl rm
audit.h	20332	0644	edit dl rm
audit_arch.h	559	0644	edit dl rm
auto_dev-ioctl.h	454	0644	edit dl rm
auto_fs.h	436	0644	edit dl rm
auxiliary_bus.h	2787	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
b1pcmcia.h	666	0644	edit dl rm
backing-dev-defs.h	10327	0644	edit dl rm
backing-dev.h	12260	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	6745	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2660	0644	edit dl rm
bcm47xx_nvram.h	1247	0644	edit dl rm
bcm47xx_sprom.h	600	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	5443	0644	edit dl rm
bio.h	20690	0644	edit dl rm
bitfield.h	5899	0644	edit dl rm
bitmap.h	21496	0644	edit dl rm
bitops.h	8870	0644	edit dl rm
bitrev.h	2541	0644	edit dl rm
bits.h	1512	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22728	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	234	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	16074	0644	edit dl rm
blk-pm.h	717	0644	edit dl rm
blkdev.h	58898	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3777	0644	edit dl rm
blk_types.h	15342	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1938	0644	edit dl rm
bottom_half.h	803	0644	edit dl rm
bpf-cgroup.h	19818	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	72824	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	1733	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5349	0644	edit dl rm
bpf_lsm.h	1431	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5395	0644	edit dl rm
bpf_verifier.h	18791	0644	edit dl rm
brcmphy.h	14023	0644	edit dl rm
bsearch.h	275	0644	edit dl rm
bsg-lib.h	2455	0644	edit dl rm
bsg.h	1094	0644	edit dl rm
btf.h	7363	0644	edit dl rm
btf_ids.h	5174	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	6999	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14379	0644	edit dl rm
bug.h	1967	0644	edit dl rm
buildid.h	248	0644	edit dl rm
build_bug.h	3066	0644	edit dl rm
bvec.h	4119	0644	edit dl rm
c2port.h	1529	0644	edit dl rm
cache.h	2182	0644	edit dl rm
cacheinfo.h	4796	0644	edit dl rm
capability.h	8179	0644	edit dl rm
cb710.h	5827	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18697	0644	edit dl rm
cc_platform.h	3140	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9193	0644	edit dl rm
cfag12864b.h	1499	0644	edit dl rm
cgroup-defs.h	27242	0644	edit dl rm
cgroup.h	28880	0644	edit dl rm
cgroup_rdma.h	1358	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	14215	0644	edit dl rm
clk-provider.h	37542	0644	edit dl rm
clk.h	25157	0644	edit dl rm
clkdev.h	1698	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	9188	0644	edit dl rm
clock_cooling.h	2106	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	1212	0644	edit dl rm
cmdline-parser.h	1238	0644	edit dl rm
cnt32_to_63.h	3691	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2244	0644	edit dl rm
coda_psdev.h	2692	0644	edit dl rm
compaction.h	7654	0644	edit dl rm
compat.h	35739	0644	edit dl rm
compat_time.h	499	0644	edit dl rm
compiler-clang.h	2446	0644	edit dl rm
compiler-gcc.h	5756	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler.h	15718	0644	edit dl rm
compiler_attributes.h	10600	0644	edit dl rm
compiler_types.h	6931	0644	edit dl rm
completion.h	4201	0644	edit dl rm
component.h	4459	0644	edit dl rm
concap.h	3778	0644	edit dl rm
configfs.h	9441	0644	edit dl rm
connector.h	2490	0644	edit dl rm
console.h	7504	0644	edit dl rm
consolemap.h	1068	0644	edit dl rm
console_struct.h	6966	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	668	0644	edit dl rm
container_of.h	1278	0644	edit dl rm
context_tracking.h	5168	0644	edit dl rm
context_tracking_state.h	1529	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	1794	0644	edit dl rm
coredump.h	797	0644	edit dl rm
coresight-pmu.h	989	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	9676	0644	edit dl rm
counter.h	15497	0644	edit dl rm
counter_enum.h	1463	0644	edit dl rm
count_zeros.h	1660	0644	edit dl rm
cper.h	16826	0644	edit dl rm
cpu.h	7959	0644	edit dl rm
cpufeature.h	1882	0644	edit dl rm
cpufreq.h	34248	0644	edit dl rm
cpuhotplug.h	14269	0644	edit dl rm
cpuidle.h	13061	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	29721	0644	edit dl rm
cpuset.h	8297	0644	edit dl rm
cpu_cooling.h	2389	0644	edit dl rm
cpu_pm.h	2850	0644	edit dl rm
cpu_rmap.h	1902	0644	edit dl rm
crash_core.h	3292	0644	edit dl rm
crash_dump.h	5193	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	613	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	622	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
cred.h	12749	0644	edit dl rm
crypto.h	59393	0644	edit dl rm
cryptohash.h	546	0644	edit dl rm
cs5535.h	6426	0644	edit dl rm
ctype.h	1791	0644	edit dl rm
cuda.h	501	0644	edit dl rm
cxl_err.h	468	0644	edit dl rm
cyclades.h	10607	0644	edit dl rm
damon.h	19616	0644	edit dl rm
davinci_emac.h	1150	0644	edit dl rm
dax.h	7553	0644	edit dl rm
dca.h	2698	0644	edit dl rm
dcache.h	19621	0644	edit dl rm
dccp.h	10989	0644	edit dl rm
dcookies.h	1329	0644	edit dl rm
debugfs.h	11921	0644	edit dl rm
debugobjects.h	3988	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2335	0644	edit dl rm
delayacct.h	6285	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
dell-led.h	128	0644	edit dl rm
devcoredump.h	2849	0644	edit dl rm
devfreq-event.h	5778	0644	edit dl rm
devfreq.h	12987	0644	edit dl rm
devfreq_cooling.h	3608	0644	edit dl rm
device-mapper.h	19529	0644	edit dl rm
device.h	67275	0644	edit dl rm
device_cgroup.h	1680	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1314	0644	edit dl rm
dev_printk.h	7731	0644	edit dl rm
digsig.h	1379	0644	edit dl rm
dim.h	8951	0644	edit dl rm
dio.h	11229	0644	edit dl rm
dirent.h	216	0644	edit dl rm
dlm.h	7240	0644	edit dl rm
dlm_plock.h	678	0644	edit dl rm
dm-bufio.h	4574	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	1136	0644	edit dl rm
dma-buf.h	21547	0644	edit dl rm
dma-contiguous.h	5070	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2983	0644	edit dl rm
dma-fence-chain.h	3576	0644	edit dl rm
dma-fence-unwrap.h	2298	0644	edit dl rm
dma-fence.h	21162	0644	edit dl rm
dma-iommu.h	3020	0644	edit dl rm
dma-map-ops.h	10863	0644	edit dl rm
dma-mapping.h	23170	0644	edit dl rm
dma-resv.h	17245	0644	edit dl rm
dmaengine.h	54891	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	8791	0644	edit dl rm
dmi.h	4375	0644	edit dl rm
dnotify.h	1047	0644	edit dl rm
dns_resolver.h	1339	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	10923	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
dw_apb_timer.h	1743	0644	edit dl rm
dynamic_debug.h	5831	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	20718	0644	edit dl rm
edd.h	1469	0644	edit dl rm
edma.h	807	0644	edit dl rm
eeprom_93cx6.h	3008	0644	edit dl rm
eeprom_93xx46.h	776	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	62813	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	6059	0644	edit dl rm
elf-fdpic.h	2237	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	1565	0644	edit dl rm
elfcore-compat.h	1267	0644	edit dl rm
elfcore.h	2160	0644	edit dl rm
elfnote.h	3625	0644	edit dl rm
enclosure.h	4711	0644	edit dl rm
energy_model.h	5994	0644	edit dl rm
err.h	1583	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1424	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	16917	0644	edit dl rm
ethtool.h	35580	0644	edit dl rm
ethtool_netlink.h	1920	0644	edit dl rm
eventfd.h	2167	0644	edit dl rm
eventpoll.h	2457	0644	edit dl rm
evm.h	2985	0644	edit dl rm
export.h	3697	0644	edit dl rm
exportfs.h	7692	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	4431	0644	edit dl rm
extcon.h	10270	0644	edit dl rm
f2fs_fs.h	18526	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1719	0644	edit dl rm
fanotify.h	2336	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28712	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	988	0644	edit dl rm
fcntl.h	1808	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	1044	0644	edit dl rm
fdtable.h	3616	0644	edit dl rm
fec.h	609	0644	edit dl rm
file.h	3147	0644	edit dl rm
filter.h	42781	0644	edit dl rm
fips.h	167	0644	edit dl rm
firewire.h	13868	0644	edit dl rm
firmware-map.h	1351	0644	edit dl rm
firmware.h	5874	0644	edit dl rm
fixp-arith.h	4516	0644	edit dl rm
flat.h	1653	0644	edit dl rm
flex_array.h	4412	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
fmc-sdb.h	1319	0644	edit dl rm
fmc.h	9877	0644	edit dl rm
font.h	1598	0644	edit dl rm
fortify-string.h	16550	0644	edit dl rm
freezer.h	9257	0644	edit dl rm
frontswap.h	3121	0644	edit dl rm
fs.h	117740	0644	edit dl rm
fscache-cache.h	19254	0644	edit dl rm
fscache.h	29577	0644	edit dl rm
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fsi.h	2424	0644	edit dl rm
fsl-diu-fb.h	4179	0644	edit dl rm
fsldma.h	398	0644	edit dl rm
fsl_devices.h	4430	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25658	0644	edit dl rm
fsnotify.h	7796	0644	edit dl rm
fsnotify_backend.h	20595	0644	edit dl rm
fs_context.h	9097	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4750	0644	edit dl rm
fs_pin.h	619	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1751	0644	edit dl rm
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ftrace_irq.h	1163	0644	edit dl rm
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gameport.h	5695	0644	edit dl rm
gcd.h	193	0644	edit dl rm
genalloc.h	7950	0644	edit dl rm
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genetlink.h	1379	0644	edit dl rm
genhd.h	16076	0644	edit dl rm
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getcpu.h	641	0644	edit dl rm
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glob.h	256	0644	edit dl rm
goldfish.h	605	0644	edit dl rm
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gpio.h	5478	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
hardirq.h	3264	0644	edit dl rm
hash.h	2998	0644	edit dl rm
hashtable.h	6805	0644	edit dl rm
hdlc.h	3413	0644	edit dl rm
hdlcdrv.h	6470	0644	edit dl rm
hdmi.h	12851	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	38339	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	4952	0644	edit dl rm
highmem.h	8235	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5249	0644	edit dl rm
hippidevice.h	1263	0644	edit dl rm
hmm.h	4656	0644	edit dl rm
host1x.h	8618	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16651	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	27496	0644	edit dl rm
hugetlb_cgroup.h	7056	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
huge_mm.h	15743	0644	edit dl rm
hwmon-sysfs.h	2024	0644	edit dl rm
hwmon-vid.h	1518	0644	edit dl rm
hwmon.h	14084	0644	edit dl rm
hwspinlock.h	13044	0644	edit dl rm
hw_breakpoint.h	4405	0644	edit dl rm
hw_random.h	2377	0644	edit dl rm
hyperv.h	50010	0644	edit dl rm
hypervisor.h	748	0644	edit dl rm
i2c-algo-bit.h	2322	0644	edit dl rm
i2c-algo-pca.h	2599	0644	edit dl rm
i2c-algo-pcf.h	1926	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/include/linux/scif.h (60280B)

/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 * * Neither the name of Intel Corporation nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Intel SCIF driver.
 *
 */
#ifndef __SCIF_H__
#define __SCIF_H__

#include <linux/types.h>
#include <linux/poll.h>
#include <linux/device.h>
#include <linux/scif_ioctl.h>

#define SCIF_ACCEPT_SYNC	1
#define SCIF_SEND_BLOCK		1
#define SCIF_RECV_BLOCK		1

enum {
	SCIF_PROT_READ = (1 << 0),
	SCIF_PROT_WRITE = (1 << 1)
};

enum {
	SCIF_MAP_FIXED = 0x10,
	SCIF_MAP_KERNEL	= 0x20,
};

enum {
	SCIF_FENCE_INIT_SELF = (1 << 0),
	SCIF_FENCE_INIT_PEER = (1 << 1),
	SCIF_SIGNAL_LOCAL = (1 << 4),
	SCIF_SIGNAL_REMOTE = (1 << 5)
};

enum {
	SCIF_RMA_USECPU = (1 << 0),
	SCIF_RMA_USECACHE = (1 << 1),
	SCIF_RMA_SYNC = (1 << 2),
	SCIF_RMA_ORDERED = (1 << 3)
};

/* End of SCIF Admin Reserved Ports */
#define SCIF_ADMIN_PORT_END	1024

/* End of SCIF Reserved Ports */
#define SCIF_PORT_RSVD		1088

typedef struct scif_endpt *scif_epd_t;
typedef struct scif_pinned_pages *scif_pinned_pages_t;

/**
 * struct scif_range - SCIF registered range used in kernel mode
 * @cookie: cookie used internally by SCIF
 * @nr_pages: number of pages of PAGE_SIZE
 * @prot_flags: R/W protection
 * @phys_addr: Array of bus addresses
 * @va: Array of kernel virtual addresses backed by the pages in the phys_addr
 *	array. The va is populated only when called on the host for a remote
 *	SCIF connection on MIC. This is required to support the use case of DMA
 *	between MIC and another device which is not a SCIF node e.g., an IB or
 *	ethernet NIC.
 */
struct scif_range {
	void *cookie;
	int nr_pages;
	int prot_flags;
	dma_addr_t *phys_addr;
	void __iomem **va;
};

/**
 * struct scif_pollepd - SCIF endpoint to be monitored via scif_poll
 * @epd: SCIF endpoint
 * @events: requested events
 * @revents: returned events
 */
struct scif_pollepd {
	scif_epd_t epd;
	__poll_t events;
	__poll_t revents;
};

/**
 * scif_peer_dev - representation of a peer SCIF device
 *
 * Peer devices show up as PCIe devices for the mgmt node but not the cards.
 * The mgmt node discovers all the cards on the PCIe bus and informs the other
 * cards about their peers. Upon notification of a peer a node adds a peer
 * device to the peer bus to maintain symmetry in the way devices are
 * discovered across all nodes in the SCIF network.
 *
 * @dev: underlying device
 * @dnode - The destination node which this device will communicate with.
 */
struct scif_peer_dev {
	struct device dev;
	u8 dnode;
};

/**
 * scif_client - representation of a SCIF client
 * @name: client name
 * @probe - client method called when a peer device is registered
 * @remove - client method called when a peer device is unregistered
 * @si - subsys_interface used internally for implementing SCIF clients
 */
struct scif_client {
	const char *name;
	void (*probe)(struct scif_peer_dev *spdev);
	void (*remove)(struct scif_peer_dev *spdev);
	struct subsys_interface si;
};

#define SCIF_OPEN_FAILED ((scif_epd_t)-1)
#define SCIF_REGISTER_FAILED ((off_t)-1)
#define SCIF_MMAP_FAILED ((void *)-1)

/**
 * scif_open() - Create an endpoint
 *
 * Return:
 * Upon successful completion, scif_open() returns an endpoint descriptor to
 * be used in subsequent SCIF functions calls to refer to that endpoint;
 * otherwise in user mode SCIF_OPEN_FAILED (that is ((scif_epd_t)-1)) is
 * returned and errno is set to indicate the error; in kernel mode a NULL
 * scif_epd_t is returned.
 *
 * Errors:
 * ENOMEM - Insufficient kernel memory was available
 */
scif_epd_t scif_open(void);

/**
 * scif_bind() - Bind an endpoint to a port
 * @epd:	endpoint descriptor
 * @pn:		port number
 *
 * scif_bind() binds endpoint epd to port pn, where pn is a port number on the
 * local node. If pn is zero, a port number greater than or equal to
 * SCIF_PORT_RSVD is assigned and returned. Each endpoint may be bound to
 * exactly one local port. Ports less than 1024 when requested can only be bound
 * by system (or root) processes or by processes executed by privileged users.
 *
 * Return:
 * Upon successful completion, scif_bind() returns the port number to which epd
 * is bound; otherwise in user mode -1 is returned and errno is set to
 * indicate the error; in kernel mode the negative of one of the following
 * errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * EINVAL - the endpoint or the port is already bound
 * EISCONN - The endpoint is already connected
 * ENOSPC - No port number available for assignment
 * EACCES - The port requested is protected and the user is not the superuser
 */
int scif_bind(scif_epd_t epd, u16 pn);

/**
 * scif_listen() - Listen for connections on an endpoint
 * @epd:	endpoint descriptor
 * @backlog:	maximum pending connection requests
 *
 * scif_listen() marks the endpoint epd as a listening endpoint - that is, as
 * an endpoint that will be used to accept incoming connection requests. Once
 * so marked, the endpoint is said to be in the listening state and may not be
 * used as the endpoint of a connection.
 *
 * The endpoint, epd, must have been bound to a port.
 *
 * The backlog argument defines the maximum length to which the queue of
 * pending connections for epd may grow. If a connection request arrives when
 * the queue is full, the client may receive an error with an indication that
 * the connection was refused.
 *
 * Return:
 * Upon successful completion, scif_listen() returns 0; otherwise in user mode
 * -1 is returned and errno is set to indicate the error; in kernel mode the
 * negative of one of the following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * EINVAL - the endpoint is not bound to a port
 * EISCONN - The endpoint is already connected or listening
 */
int scif_listen(scif_epd_t epd, int backlog);

/**
 * scif_connect() - Initiate a connection on a port
 * @epd:	endpoint descriptor
 * @dst:	global id of port to which to connect
 *
 * The scif_connect() function requests the connection of endpoint epd to remote
 * port dst. If the connection is successful, a peer endpoint, bound to dst, is
 * created on node dst.node. On successful return, the connection is complete.
 *
 * If the endpoint epd has not already been bound to a port, scif_connect()
 * will bind it to an unused local port.
 *
 * A connection is terminated when an endpoint of the connection is closed,
 * either explicitly by scif_close(), or when a process that owns one of the
 * endpoints of the connection is terminated.
 *
 * In user space, scif_connect() supports an asynchronous connection mode
 * if the application has set the O_NONBLOCK flag on the endpoint via the
 * fcntl() system call. Setting this flag will result in the calling process
 * not to wait during scif_connect().
 *
 * Return:
 * Upon successful completion, scif_connect() returns the port ID to which the
 * endpoint, epd, is bound; otherwise in user mode -1 is returned and errno is
 * set to indicate the error; in kernel mode the negative of one of the
 * following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNREFUSED - The destination was not listening for connections or refused
 * the connection request
 * EINVAL - dst.port is not a valid port ID
 * EISCONN - The endpoint is already connected
 * ENOMEM - No buffer space is available
 * ENODEV - The destination node does not exist, or the node is lost or existed,
 * but is not currently in the network since it may have crashed
 * ENOSPC - No port number available for assignment
 * EOPNOTSUPP - The endpoint is listening and cannot be connected
 */
int scif_connect(scif_epd_t epd, struct scif_port_id *dst);

/**
 * scif_accept() - Accept a connection on an endpoint
 * @epd:	endpoint descriptor
 * @peer:	global id of port to which connected
 * @newepd:	new connected endpoint descriptor
 * @flags:	flags
 *
 * The scif_accept() call extracts the first connection request from the queue
 * of pending connections for the port on which epd is listening. scif_accept()
 * creates a new endpoint, bound to the same port as epd, and allocates a new
 * SCIF endpoint descriptor, returned in newepd, for the endpoint. The new
 * endpoint is connected to the endpoint through which the connection was
 * requested. epd is unaffected by this call, and remains in the listening
 * state.
 *
 * On successful return, peer holds the global port identifier (node id and
 * local port number) of the port which requested the connection.
 *
 * A connection is terminated when an endpoint of the connection is closed,
 * either explicitly by scif_close(), or when a process that owns one of the
 * endpoints of the connection is terminated.
 *
 * The number of connections that can (subsequently) be accepted on epd is only
 * limited by system resources (memory).
 *
 * The flags argument is formed by OR'ing together zero or more of the
 * following values.
 * SCIF_ACCEPT_SYNC - block until a connection request is presented. If
 *			SCIF_ACCEPT_SYNC is not in flags, and no pending
 *			connections are present on the queue, scif_accept()
 *			fails with an EAGAIN error
 *
 * In user mode, the select() and poll() functions can be used to determine
 * when there is a connection request. In kernel mode, the scif_poll()
 * function may be used for this purpose. A readable event will be delivered
 * when a connection is requested.
 *
 * Return:
 * Upon successful completion, scif_accept() returns 0; otherwise in user mode
 * -1 is returned and errno is set to indicate the error; in kernel mode the
 *	negative of one of the following errors is returned.
 *
 * Errors:
 * EAGAIN - SCIF_ACCEPT_SYNC is not set and no connections are present to be
 * accepted or SCIF_ACCEPT_SYNC is not set and remote node failed to complete
 * its connection request
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * EINTR - Interrupted function
 * EINVAL - epd is not a listening endpoint, or flags is invalid, or peer is
 * NULL, or newepd is NULL
 * ENODEV - The requesting node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOMEM - Not enough space
 * ENOENT - Secondary part of epd registration failed
 */
int scif_accept(scif_epd_t epd, struct scif_port_id *peer, scif_epd_t
		*newepd, int flags);

/**
 * scif_close() - Close an endpoint
 * @epd:	endpoint descriptor
 *
 * scif_close() closes an endpoint and performs necessary teardown of
 * facilities associated with that endpoint.
 *
 * If epd is a listening endpoint then it will no longer accept connection
 * requests on the port to which it is bound. Any pending connection requests
 * are rejected.
 *
 * If epd is a connected endpoint, then its peer endpoint is also closed. RMAs
 * which are in-process through epd or its peer endpoint will complete before
 * scif_close() returns. Registered windows of the local and peer endpoints are
 * released as if scif_unregister() was called against each window.
 *
 * Closing a SCIF endpoint does not affect local registered memory mapped by
 * a SCIF endpoint on a remote node. The local memory remains mapped by the peer
 * SCIF endpoint explicitly removed by calling munmap(..) by the peer.
 *
 * If the peer endpoint's receive queue is not empty at the time that epd is
 * closed, then the peer endpoint can be passed as the endpoint parameter to
 * scif_recv() until the receive queue is empty.
 *
 * epd is freed and may no longer be accessed.
 *
 * Return:
 * Upon successful completion, scif_close() returns 0; otherwise in user mode
 * -1 is returned and errno is set to indicate the error; in kernel mode the
 * negative of one of the following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 */
int scif_close(scif_epd_t epd);

/**
 * scif_send() - Send a message
 * @epd:	endpoint descriptor
 * @msg:	message buffer address
 * @len:	message length
 * @flags:	blocking mode flags
 *
 * scif_send() sends data to the peer of endpoint epd. Up to len bytes of data
 * are copied from memory starting at address msg. On successful execution the
 * return value of scif_send() is the number of bytes that were sent, and is
 * zero if no bytes were sent because len was zero. scif_send() may be called
 * only when the endpoint is in a connected state.
 *
 * If a scif_send() call is non-blocking, then it sends only those bytes which
 * can be sent without waiting, up to a maximum of len bytes.
 *
 * If a scif_send() call is blocking, then it normally returns after sending
 * all len bytes. If a blocking call is interrupted or the connection is
 * reset, the call is considered successful if some bytes were sent or len is
 * zero, otherwise the call is considered unsuccessful.
 *
 * In user mode, the select() and poll() functions can be used to determine
 * when the send queue is not full. In kernel mode, the scif_poll() function
 * may be used for this purpose.
 *
 * It is recommended that scif_send()/scif_recv() only be used for short
 * control-type message communication between SCIF endpoints. The SCIF RMA
 * APIs are expected to provide better performance for transfer sizes of
 * 1024 bytes or longer for the current MIC hardware and software
 * implementation.
 *
 * scif_send() will block until the entire message is sent if SCIF_SEND_BLOCK
 * is passed as the flags argument.
 *
 * Return:
 * Upon successful completion, scif_send() returns the number of bytes sent;
 * otherwise in user mode -1 is returned and errno is set to indicate the
 * error; in kernel mode the negative of one of the following errors is
 * returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - flags is invalid, or len is negative
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOMEM - Not enough space
 * ENOTCONN - The endpoint is not connected
 */
int scif_send(scif_epd_t epd, void *msg, int len, int flags);

/**
 * scif_recv() - Receive a message
 * @epd:	endpoint descriptor
 * @msg:	message buffer address
 * @len:	message buffer length
 * @flags:	blocking mode flags
 *
 * scif_recv() receives data from the peer of endpoint epd. Up to len bytes of
 * data are copied to memory starting at address msg. On successful execution
 * the return value of scif_recv() is the number of bytes that were received,
 * and is zero if no bytes were received because len was zero. scif_recv() may
 * be called only when the endpoint is in a connected state.
 *
 * If a scif_recv() call is non-blocking, then it receives only those bytes
 * which can be received without waiting, up to a maximum of len bytes.
 *
 * If a scif_recv() call is blocking, then it normally returns after receiving
 * all len bytes. If the blocking call was interrupted due to a disconnection,
 * subsequent calls to scif_recv() will copy all bytes received upto the point
 * of disconnection.
 *
 * In user mode, the select() and poll() functions can be used to determine
 * when data is available to be received. In kernel mode, the scif_poll()
 * function may be used for this purpose.
 *
 * It is recommended that scif_send()/scif_recv() only be used for short
 * control-type message communication between SCIF endpoints. The SCIF RMA
 * APIs are expected to provide better performance for transfer sizes of
 * 1024 bytes or longer for the current MIC hardware and software
 * implementation.
 *
 * scif_recv() will block until the entire message is received if
 * SCIF_RECV_BLOCK is passed as the flags argument.
 *
 * Return:
 * Upon successful completion, scif_recv() returns the number of bytes
 * received; otherwise in user mode -1 is returned and errno is set to
 * indicate the error; in kernel mode the negative of one of the following
 * errors is returned.
 *
 * Errors:
 * EAGAIN - The destination node is returning from a low power state
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - flags is invalid, or len is negative
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOMEM - Not enough space
 * ENOTCONN - The endpoint is not connected
 */
int scif_recv(scif_epd_t epd, void *msg, int len, int flags);

/**
 * scif_register() - Mark a memory region for remote access.
 * @epd:		endpoint descriptor
 * @addr:		starting virtual address
 * @len:		length of range
 * @offset:		offset of window
 * @prot_flags:		read/write protection flags
 * @map_flags:		mapping flags
 *
 * The scif_register() function opens a window, a range of whole pages of the
 * registered address space of the endpoint epd, starting at offset po and
 * continuing for len bytes. The value of po, further described below, is a
 * function of the parameters offset and len, and the value of map_flags. Each
 * page of the window represents the physical memory page which backs the
 * corresponding page of the range of virtual address pages starting at addr
 * and continuing for len bytes. addr and len are constrained to be multiples
 * of the page size. A successful scif_register() call returns po.
 *
 * When SCIF_MAP_FIXED is set in the map_flags argument, po will be offset
 * exactly, and offset is constrained to be a multiple of the page size. The
 * mapping established by scif_register() will not replace any existing
 * registration; an error is returned if any page within the range [offset,
 * offset + len - 1] intersects an existing window.
 *
 * When SCIF_MAP_FIXED is not set, the implementation uses offset in an
 * implementation-defined manner to arrive at po. The po value so chosen will
 * be an area of the registered address space that the implementation deems
 * suitable for a mapping of len bytes. An offset value of 0 is interpreted as
 * granting the implementation complete freedom in selecting po, subject to
 * constraints described below. A non-zero value of offset is taken to be a
 * suggestion of an offset near which the mapping should be placed. When the
 * implementation selects a value for po, it does not replace any extant
 * window. In all cases, po will be a multiple of the page size.
 *
 * The physical pages which are so represented by a window are available for
 * access in calls to mmap(), scif_readfrom(), scif_writeto(),
 * scif_vreadfrom(), and scif_vwriteto(). While a window is registered, the
 * physical pages represented by the window will not be reused by the memory
 * subsystem for any other purpose. Note that the same physical page may be
 * represented by multiple windows.
 *
 * Subsequent operations which change the memory pages to which virtual
 * addresses are mapped (such as mmap(), munmap()) have no effect on
 * existing window.
 *
 * If the process will fork(), it is recommended that the registered
 * virtual address range be marked with MADV_DONTFORK. Doing so will prevent
 * problems due to copy-on-write semantics.
 *
 * The prot_flags argument is formed by OR'ing together one or more of the
 * following values.
 * SCIF_PROT_READ - allow read operations from the window
 * SCIF_PROT_WRITE - allow write operations to the window
 *
 * Return:
 * Upon successful completion, scif_register() returns the offset at which the
 * mapping was placed (po); otherwise in user mode SCIF_REGISTER_FAILED (that
 * is (off_t *)-1) is returned and errno is set to indicate the error; in
 * kernel mode the negative of one of the following errors is returned.
 *
 * Errors:
 * EADDRINUSE - SCIF_MAP_FIXED is set in map_flags, and pages in the range
 * [offset, offset + len -1] are already registered
 * EAGAIN - The mapping could not be performed due to lack of resources
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - map_flags is invalid, or prot_flags is invalid, or SCIF_MAP_FIXED is
 * set in flags, and offset is not a multiple of the page size, or addr is not a
 * multiple of the page size, or len is not a multiple of the page size, or is
 * 0, or offset is negative
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOMEM - Not enough space
 * ENOTCONN -The endpoint is not connected
 */
off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset,
		    int prot_flags, int map_flags);

/**
 * scif_unregister() - Mark a memory region for remote access.
 * @epd:	endpoint descriptor
 * @offset:	start of range to unregister
 * @len:	length of range to unregister
 *
 * The scif_unregister() function closes those previously registered windows
 * which are entirely within the range [offset, offset + len - 1]. It is an
 * error to specify a range which intersects only a subrange of a window.
 *
 * On a successful return, pages within the window may no longer be specified
 * in calls to mmap(), scif_readfrom(), scif_writeto(), scif_vreadfrom(),
 * scif_vwriteto(), scif_get_pages, and scif_fence_signal(). The window,
 * however, continues to exist until all previous references against it are
 * removed. A window is referenced if there is a mapping to it created by
 * mmap(), or if scif_get_pages() was called against the window
 * (and the pages have not been returned via scif_put_pages()). A window is
 * also referenced while an RMA, in which some range of the window is a source
 * or destination, is in progress. Finally a window is referenced while some
 * offset in that window was specified to scif_fence_signal(), and the RMAs
 * marked by that call to scif_fence_signal() have not completed. While a
 * window is in this state, its registered address space pages are not
 * available for use in a new registered window.
 *
 * When all such references to the window have been removed, its references to
 * all the physical pages which it represents are removed. Similarly, the
 * registered address space pages of the window become available for
 * registration in a new window.
 *
 * Return:
 * Upon successful completion, scif_unregister() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned. In the event of an
 * error, no windows are unregistered.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - the range [offset, offset + len - 1] intersects a subrange of a
 * window, or offset is negative
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - Offsets in the range [offset, offset + len - 1] are invalid for the
 * registered address space of epd
 */
int scif_unregister(scif_epd_t epd, off_t offset, size_t len);

/**
 * scif_readfrom() - Copy from a remote address space
 * @epd:	endpoint descriptor
 * @loffset:	offset in local registered address space to
 *		which to copy
 * @len:	length of range to copy
 * @roffset:	offset in remote registered address space
 *		from which to copy
 * @rma_flags:	transfer mode flags
 *
 * scif_readfrom() copies len bytes from the remote registered address space of
 * the peer of endpoint epd, starting at the offset roffset to the local
 * registered address space of epd, starting at the offset loffset.
 *
 * Each of the specified ranges [loffset, loffset + len - 1] and [roffset,
 * roffset + len - 1] must be within some registered window or windows of the
 * local and remote nodes. A range may intersect multiple registered windows,
 * but only if those windows are contiguous in the registered address space.
 *
 * If rma_flags includes SCIF_RMA_USECPU, then the data is copied using
 * programmed read/writes. Otherwise the data is copied using DMA. If rma_-
 * flags includes SCIF_RMA_SYNC, then scif_readfrom() will return after the
 * transfer is complete. Otherwise, the transfer may be performed asynchron-
 * ously. The order in which any two asynchronous RMA operations complete
 * is non-deterministic. The synchronization functions, scif_fence_mark()/
 * scif_fence_wait() and scif_fence_signal(), can be used to synchronize to
 * the completion of asynchronous RMA operations on the same endpoint.
 *
 * The DMA transfer of individual bytes is not guaranteed to complete in
 * address order. If rma_flags includes SCIF_RMA_ORDERED, then the last
 * cacheline or partial cacheline of the source range will become visible on
 * the destination node after all other transferred data in the source
 * range has become visible on the destination node.
 *
 * The optimal DMA performance will likely be realized if both
 * loffset and roffset are cacheline aligned (are a multiple of 64). Lower
 * performance will likely be realized if loffset and roffset are not
 * cacheline aligned but are separated by some multiple of 64. The lowest level
 * of performance is likely if loffset and roffset are not separated by a
 * multiple of 64.
 *
 * The rma_flags argument is formed by ORing together zero or more of the
 * following values.
 * SCIF_RMA_USECPU - perform the transfer using the CPU, otherwise use the DMA
 *	engine.
 * SCIF_RMA_SYNC - perform the transfer synchronously, returning after the
 *		transfer has completed. Passing this flag results in the
 *		current implementation busy waiting and consuming CPU cycles
 *		while the DMA transfer is in progress for best performance by
 *		avoiding the interrupt latency.
 * SCIF_RMA_ORDERED - ensure that the last cacheline or partial cacheline of
 *		the source range becomes visible on the destination node
 *		after all other transferred data in the source range has
 *		become visible on the destination
 *
 * Return:
 * Upon successful completion, scif_readfrom() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EACCESS - Attempt to write to a read-only range
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - rma_flags is invalid
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - The range [loffset, loffset + len - 1] is invalid for the registered
 * address space of epd, or, The range [roffset, roffset + len - 1] is invalid
 * for the registered address space of the peer of epd, or loffset or roffset
 * is negative
 */
int scif_readfrom(scif_epd_t epd, off_t loffset, size_t len, off_t
		  roffset, int rma_flags);

/**
 * scif_writeto() - Copy to a remote address space
 * @epd:	endpoint descriptor
 * @loffset:	offset in local registered address space
 *		from which to copy
 * @len:	length of range to copy
 * @roffset:	offset in remote registered address space to
 *		which to copy
 * @rma_flags:	transfer mode flags
 *
 * scif_writeto() copies len bytes from the local registered address space of
 * epd, starting at the offset loffset to the remote registered address space
 * of the peer of endpoint epd, starting at the offset roffset.
 *
 * Each of the specified ranges [loffset, loffset + len - 1] and [roffset,
 * roffset + len - 1] must be within some registered window or windows of the
 * local and remote nodes. A range may intersect multiple registered windows,
 * but only if those windows are contiguous in the registered address space.
 *
 * If rma_flags includes SCIF_RMA_USECPU, then the data is copied using
 * programmed read/writes. Otherwise the data is copied using DMA. If rma_-
 * flags includes SCIF_RMA_SYNC, then scif_writeto() will return after the
 * transfer is complete. Otherwise, the transfer may be performed asynchron-
 * ously. The order in which any two asynchronous RMA operations complete
 * is non-deterministic. The synchronization functions, scif_fence_mark()/
 * scif_fence_wait() and scif_fence_signal(), can be used to synchronize to
 * the completion of asynchronous RMA operations on the same endpoint.
 *
 * The DMA transfer of individual bytes is not guaranteed to complete in
 * address order. If rma_flags includes SCIF_RMA_ORDERED, then the last
 * cacheline or partial cacheline of the source range will become visible on
 * the destination node after all other transferred data in the source
 * range has become visible on the destination node.
 *
 * The optimal DMA performance will likely be realized if both
 * loffset and roffset are cacheline aligned (are a multiple of 64). Lower
 * performance will likely be realized if loffset and roffset are not cacheline
 * aligned but are separated by some multiple of 64. The lowest level of
 * performance is likely if loffset and roffset are not separated by a multiple
 * of 64.
 *
 * The rma_flags argument is formed by ORing together zero or more of the
 * following values.
 * SCIF_RMA_USECPU - perform the transfer using the CPU, otherwise use the DMA
 *			engine.
 * SCIF_RMA_SYNC - perform the transfer synchronously, returning after the
 *		transfer has completed. Passing this flag results in the
 *		current implementation busy waiting and consuming CPU cycles
 *		while the DMA transfer is in progress for best performance by
 *		avoiding the interrupt latency.
 * SCIF_RMA_ORDERED - ensure that the last cacheline or partial cacheline of
 *		the source range becomes visible on the destination node
 *		after all other transferred data in the source range has
 *		become visible on the destination
 *
 * Return:
 * Upon successful completion, scif_readfrom() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EACCESS - Attempt to write to a read-only range
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - rma_flags is invalid
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - The range [loffset, loffset + len - 1] is invalid for the registered
 * address space of epd, or, The range [roffset , roffset + len -1] is invalid
 * for the registered address space of the peer of epd, or loffset or roffset
 * is negative
 */
int scif_writeto(scif_epd_t epd, off_t loffset, size_t len, off_t
		 roffset, int rma_flags);

/**
 * scif_vreadfrom() - Copy from a remote address space
 * @epd:	endpoint descriptor
 * @addr:	address to which to copy
 * @len:	length of range to copy
 * @roffset:	offset in remote registered address space
 *		from which to copy
 * @rma_flags:	transfer mode flags
 *
 * scif_vreadfrom() copies len bytes from the remote registered address
 * space of the peer of endpoint epd, starting at the offset roffset, to local
 * memory, starting at addr.
 *
 * The specified range [roffset, roffset + len - 1] must be within some
 * registered window or windows of the remote nodes. The range may
 * intersect multiple registered windows, but only if those windows are
 * contiguous in the registered address space.
 *
 * If rma_flags includes SCIF_RMA_USECPU, then the data is copied using
 * programmed read/writes. Otherwise the data is copied using DMA. If rma_-
 * flags includes SCIF_RMA_SYNC, then scif_vreadfrom() will return after the
 * transfer is complete. Otherwise, the transfer may be performed asynchron-
 * ously. The order in which any two asynchronous RMA operations complete
 * is non-deterministic. The synchronization functions, scif_fence_mark()/
 * scif_fence_wait() and scif_fence_signal(), can be used to synchronize to
 * the completion of asynchronous RMA operations on the same endpoint.
 *
 * The DMA transfer of individual bytes is not guaranteed to complete in
 * address order. If rma_flags includes SCIF_RMA_ORDERED, then the last
 * cacheline or partial cacheline of the source range will become visible on
 * the destination node after all other transferred data in the source
 * range has become visible on the destination node.
 *
 * If rma_flags includes SCIF_RMA_USECACHE, then the physical pages which back
 * the specified local memory range may be remain in a pinned state even after
 * the specified transfer completes. This may reduce overhead if some or all of
 * the same virtual address range is referenced in a subsequent call of
 * scif_vreadfrom() or scif_vwriteto().
 *
 * The optimal DMA performance will likely be realized if both
 * addr and roffset are cacheline aligned (are a multiple of 64). Lower
 * performance will likely be realized if addr and roffset are not
 * cacheline aligned but are separated by some multiple of 64. The lowest level
 * of performance is likely if addr and roffset are not separated by a
 * multiple of 64.
 *
 * The rma_flags argument is formed by ORing together zero or more of the
 * following values.
 * SCIF_RMA_USECPU - perform the transfer using the CPU, otherwise use the DMA
 *	engine.
 * SCIF_RMA_USECACHE - enable registration caching
 * SCIF_RMA_SYNC - perform the transfer synchronously, returning after the
 *		transfer has completed. Passing this flag results in the
 *		current implementation busy waiting and consuming CPU cycles
 *		while the DMA transfer is in progress for best performance by
 *		avoiding the interrupt latency.
 * SCIF_RMA_ORDERED - ensure that the last cacheline or partial cacheline of
 *	the source range becomes visible on the destination node
 *	after all other transferred data in the source range has
 *	become visible on the destination
 *
 * Return:
 * Upon successful completion, scif_vreadfrom() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EACCESS - Attempt to write to a read-only range
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - rma_flags is invalid
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - Offsets in the range [roffset, roffset + len - 1] are invalid for the
 * registered address space of epd
 */
int scif_vreadfrom(scif_epd_t epd, void *addr, size_t len, off_t roffset,
		   int rma_flags);

/**
 * scif_vwriteto() - Copy to a remote address space
 * @epd:	endpoint descriptor
 * @addr:	address from which to copy
 * @len:	length of range to copy
 * @roffset:	offset in remote registered address space to
 *		which to copy
 * @rma_flags:	transfer mode flags
 *
 * scif_vwriteto() copies len bytes from the local memory, starting at addr, to
 * the remote registered address space of the peer of endpoint epd, starting at
 * the offset roffset.
 *
 * The specified range [roffset, roffset + len - 1] must be within some
 * registered window or windows of the remote nodes. The range may intersect
 * multiple registered windows, but only if those windows are contiguous in the
 * registered address space.
 *
 * If rma_flags includes SCIF_RMA_USECPU, then the data is copied using
 * programmed read/writes. Otherwise the data is copied using DMA. If rma_-
 * flags includes SCIF_RMA_SYNC, then scif_vwriteto() will return after the
 * transfer is complete. Otherwise, the transfer may be performed asynchron-
 * ously. The order in which any two asynchronous RMA operations complete
 * is non-deterministic. The synchronization functions, scif_fence_mark()/
 * scif_fence_wait() and scif_fence_signal(), can be used to synchronize to
 * the completion of asynchronous RMA operations on the same endpoint.
 *
 * The DMA transfer of individual bytes is not guaranteed to complete in
 * address order. If rma_flags includes SCIF_RMA_ORDERED, then the last
 * cacheline or partial cacheline of the source range will become visible on
 * the destination node after all other transferred data in the source
 * range has become visible on the destination node.
 *
 * If rma_flags includes SCIF_RMA_USECACHE, then the physical pages which back
 * the specified local memory range may be remain in a pinned state even after
 * the specified transfer completes. This may reduce overhead if some or all of
 * the same virtual address range is referenced in a subsequent call of
 * scif_vreadfrom() or scif_vwriteto().
 *
 * The optimal DMA performance will likely be realized if both
 * addr and offset are cacheline aligned (are a multiple of 64). Lower
 * performance will likely be realized if addr and offset are not cacheline
 * aligned but are separated by some multiple of 64. The lowest level of
 * performance is likely if addr and offset are not separated by a multiple of
 * 64.
 *
 * The rma_flags argument is formed by ORing together zero or more of the
 * following values.
 * SCIF_RMA_USECPU - perform the transfer using the CPU, otherwise use the DMA
 *	engine.
 * SCIF_RMA_USECACHE - allow registration caching
 * SCIF_RMA_SYNC - perform the transfer synchronously, returning after the
 *		transfer has completed. Passing this flag results in the
 *		current implementation busy waiting and consuming CPU cycles
 *		while the DMA transfer is in progress for best performance by
 *		avoiding the interrupt latency.
 * SCIF_RMA_ORDERED - ensure that the last cacheline or partial cacheline of
 *		the source range becomes visible on the destination node
 *		after all other transferred data in the source range has
 *		become visible on the destination
 *
 * Return:
 * Upon successful completion, scif_vwriteto() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EACCESS - Attempt to write to a read-only range
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - rma_flags is invalid
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - Offsets in the range [roffset, roffset + len - 1] are invalid for the
 * registered address space of epd
 */
int scif_vwriteto(scif_epd_t epd, void *addr, size_t len, off_t roffset,
		  int rma_flags);

/**
 * scif_fence_mark() - Mark previously issued RMAs
 * @epd:	endpoint descriptor
 * @flags:	control flags
 * @mark:	marked value returned as output.
 *
 * scif_fence_mark() returns after marking the current set of all uncompleted
 * RMAs initiated through the endpoint epd or the current set of all
 * uncompleted RMAs initiated through the peer of endpoint epd. The RMAs are
 * marked with a value returned at mark. The application may subsequently call
 * scif_fence_wait(), passing the value returned at mark, to await completion
 * of all RMAs so marked.
 *
 * The flags argument has exactly one of the following values.
 * SCIF_FENCE_INIT_SELF - RMA operations initiated through endpoint
 *	epd are marked
 * SCIF_FENCE_INIT_PEER - RMA operations initiated through the peer
 *	of endpoint epd are marked
 *
 * Return:
 * Upon successful completion, scif_fence_mark() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - flags is invalid
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENOMEM - Insufficient kernel memory was available
 */
int scif_fence_mark(scif_epd_t epd, int flags, int *mark);

/**
 * scif_fence_wait() - Wait for completion of marked RMAs
 * @epd:	endpoint descriptor
 * @mark:	mark request
 *
 * scif_fence_wait() returns after all RMAs marked with mark have completed.
 * The value passed in mark must have been obtained in a previous call to
 * scif_fence_mark().
 *
 * Return:
 * Upon successful completion, scif_fence_wait() returns 0; otherwise in user
 * mode -1 is returned and errno is set to indicate the error; in kernel mode
 * the negative of one of the following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENOMEM - Insufficient kernel memory was available
 */
int scif_fence_wait(scif_epd_t epd, int mark);

/**
 * scif_fence_signal() - Request a memory update on completion of RMAs
 * @epd:	endpoint descriptor
 * @loff:	local offset
 * @lval:	local value to write to loffset
 * @roff:	remote offset
 * @rval:	remote value to write to roffset
 * @flags:	flags
 *
 * scif_fence_signal() returns after marking the current set of all uncompleted
 * RMAs initiated through the endpoint epd or marking the current set of all
 * uncompleted RMAs initiated through the peer of endpoint epd.
 *
 * If flags includes SCIF_SIGNAL_LOCAL, then on completion of the RMAs in the
 * marked set, lval is written to memory at the address corresponding to offset
 * loff in the local registered address space of epd. loff must be within a
 * registered window. If flags includes SCIF_SIGNAL_REMOTE, then on completion
 * of the RMAs in the marked set, rval is written to memory at the address
 * corresponding to offset roff in the remote registered address space of epd.
 * roff must be within a remote registered window of the peer of epd. Note
 * that any specified offset must be DWORD (4 byte / 32 bit) aligned.
 *
 * The flags argument is formed by OR'ing together the following.
 * Exactly one of the following values.
 * SCIF_FENCE_INIT_SELF - RMA operations initiated through endpoint
 *	epd are marked
 * SCIF_FENCE_INIT_PEER - RMA operations initiated through the peer
 *	of endpoint epd are marked
 * One or more of the following values.
 * SCIF_SIGNAL_LOCAL - On completion of the marked set of RMAs, write lval to
 *	memory at the address corresponding to offset loff in the local
 *	registered address space of epd.
 * SCIF_SIGNAL_REMOTE - On completion of the marked set of RMAs, write rval to
 *	memory at the address corresponding to offset roff in the remote
 *	registered address space of epd.
 *
 * Return:
 * Upon successful completion, scif_fence_signal() returns 0; otherwise in
 * user mode -1 is returned and errno is set to indicate the error; in kernel
 * mode the negative of one of the following errors is returned.
 *
 * Errors:
 * EBADF, ENOTTY - epd is not a valid endpoint descriptor
 * ECONNRESET - Connection reset by peer
 * EINVAL - flags is invalid, or loff or roff are not DWORD aligned
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - loff is invalid for the registered address of epd, or roff is invalid
 * for the registered address space, of the peer of epd
 */
int scif_fence_signal(scif_epd_t epd, off_t loff, u64 lval, off_t roff,
		      u64 rval, int flags);

/**
 * scif_get_node_ids() - Return information about online nodes
 * @nodes:	array in which to return online node IDs
 * @len:	number of entries in the nodes array
 * @self:	address to place the node ID of the local node
 *
 * scif_get_node_ids() fills in the nodes array with up to len node IDs of the
 * nodes in the SCIF network. If there is not enough space in nodes, as
 * indicated by the len parameter, only len node IDs are returned in nodes. The
 * return value of scif_get_node_ids() is the total number of nodes currently in
 * the SCIF network. By checking the return value against the len parameter,
 * the user may determine if enough space for nodes was allocated.
 *
 * The node ID of the local node is returned at self.
 *
 * Return:
 * Upon successful completion, scif_get_node_ids() returns the actual number of
 * online nodes in the SCIF network including 'self'; otherwise in user mode
 * -1 is returned and errno is set to indicate the error; in kernel mode no
 * errors are returned.
 */
int scif_get_node_ids(u16 *nodes, int len, u16 *self);

/**
 * scif_pin_pages() - Pin a set of pages
 * @addr:		Virtual address of range to pin
 * @len:		Length of range to pin
 * @prot_flags:		Page protection flags
 * @map_flags:		Page classification flags
 * @pinned_pages:	Handle to pinned pages
 *
 * scif_pin_pages() pins (locks in physical memory) the physical pages which
 * back the range of virtual address pages starting at addr and continuing for
 * len bytes. addr and len are constrained to be multiples of the page size. A
 * successful scif_pin_pages() call returns a handle to pinned_pages which may
 * be used in subsequent calls to scif_register_pinned_pages().
 *
 * The pages will remain pinned as long as there is a reference against the
 * scif_pinned_pages_t value returned by scif_pin_pages() and until
 * scif_unpin_pages() is called, passing the scif_pinned_pages_t value. A
 * reference is added to a scif_pinned_pages_t value each time a window is
 * created by calling scif_register_pinned_pages() and passing the
 * scif_pinned_pages_t value. A reference is removed from a
 * scif_pinned_pages_t value each time such a window is deleted.
 *
 * Subsequent operations which change the memory pages to which virtual
 * addresses are mapped (such as mmap(), munmap()) have no effect on the
 * scif_pinned_pages_t value or windows created against it.
 *
 * If the process will fork(), it is recommended that the registered
 * virtual address range be marked with MADV_DONTFORK. Doing so will prevent
 * problems due to copy-on-write semantics.
 *
 * The prot_flags argument is formed by OR'ing together one or more of the
 * following values.
 * SCIF_PROT_READ - allow read operations against the pages
 * SCIF_PROT_WRITE - allow write operations against the pages
 * The map_flags argument can be set as SCIF_MAP_KERNEL to interpret addr as a
 * kernel space address. By default, addr is interpreted as a user space
 * address.
 *
 * Return:
 * Upon successful completion, scif_pin_pages() returns 0; otherwise the
 * negative of one of the following errors is returned.
 *
 * Errors:
 * EINVAL - prot_flags is invalid, map_flags is invalid, or offset is negative
 * ENOMEM - Not enough space
 */
int scif_pin_pages(void *addr, size_t len, int prot_flags, int map_flags,
		   scif_pinned_pages_t *pinned_pages);

/**
 * scif_unpin_pages() - Unpin a set of pages
 * @pinned_pages:	Handle to pinned pages to be unpinned
 *
 * scif_unpin_pages() prevents scif_register_pinned_pages() from registering new
 * windows against pinned_pages. The physical pages represented by pinned_pages
 * will remain pinned until all windows previously registered against
 * pinned_pages are deleted (the window is scif_unregister()'d and all
 * references to the window are removed (see scif_unregister()).
 *
 * pinned_pages must have been obtain from a previous call to scif_pin_pages().
 * After calling scif_unpin_pages(), it is an error to pass pinned_pages to
 * scif_register_pinned_pages().
 *
 * Return:
 * Upon successful completion, scif_unpin_pages() returns 0; otherwise the
 * negative of one of the following errors is returned.
 *
 * Errors:
 * EINVAL - pinned_pages is not valid
 */
int scif_unpin_pages(scif_pinned_pages_t pinned_pages);

/**
 * scif_register_pinned_pages() - Mark a memory region for remote access.
 * @epd:		endpoint descriptor
 * @pinned_pages:	Handle to pinned pages
 * @offset:		Registered address space offset
 * @map_flags:		Flags which control where pages are mapped
 *
 * The scif_register_pinned_pages() function opens a window, a range of whole
 * pages of the registered address space of the endpoint epd, starting at
 * offset po. The value of po, further described below, is a function of the
 * parameters offset and pinned_pages, and the value of map_flags. Each page of
 * the window represents a corresponding physical memory page of the range
 * represented by pinned_pages; the length of the window is the same as the
 * length of range represented by pinned_pages. A successful
 * scif_register_pinned_pages() call returns po as the return value.
 *
 * When SCIF_MAP_FIXED is set in the map_flags argument, po will be offset
 * exactly, and offset is constrained to be a multiple of the page size. The
 * mapping established by scif_register_pinned_pages() will not replace any
 * existing registration; an error is returned if any page of the new window
 * would intersect an existing window.
 *
 * When SCIF_MAP_FIXED is not set, the implementation uses offset in an
 * implementation-defined manner to arrive at po. The po so chosen will be an
 * area of the registered address space that the implementation deems suitable
 * for a mapping of the required size. An offset value of 0 is interpreted as
 * granting the implementation complete freedom in selecting po, subject to
 * constraints described below. A non-zero value of offset is taken to be a
 * suggestion of an offset near which the mapping should be placed. When the
 * implementation selects a value for po, it does not replace any extant
 * window. In all cases, po will be a multiple of the page size.
 *
 * The physical pages which are so represented by a window are available for
 * access in calls to scif_get_pages(), scif_readfrom(), scif_writeto(),
 * scif_vreadfrom(), and scif_vwriteto(). While a window is registered, the
 * physical pages represented by the window will not be reused by the memory
 * subsystem for any other purpose. Note that the same physical page may be
 * represented by multiple windows.
 *
 * Windows created by scif_register_pinned_pages() are unregistered by
 * scif_unregister().
 *
 * The map_flags argument can be set to SCIF_MAP_FIXED which interprets a
 * fixed offset.
 *
 * Return:
 * Upon successful completion, scif_register_pinned_pages() returns the offset
 * at which the mapping was placed (po); otherwise the negative of one of the
 * following errors is returned.
 *
 * Errors:
 * EADDRINUSE - SCIF_MAP_FIXED is set in map_flags and pages in the new window
 * would intersect an existing window
 * EAGAIN - The mapping could not be performed due to lack of resources
 * ECONNRESET - Connection reset by peer
 * EINVAL - map_flags is invalid, or SCIF_MAP_FIXED is set in map_flags, and
 * offset is not a multiple of the page size, or offset is negative
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOMEM - Not enough space
 * ENOTCONN - The endpoint is not connected
 */
off_t scif_register_pinned_pages(scif_epd_t epd,
				 scif_pinned_pages_t pinned_pages,
				 off_t offset, int map_flags);

/**
 * scif_get_pages() - Add references to remote registered pages
 * @epd:	endpoint descriptor
 * @offset:	remote registered offset
 * @len:	length of range of pages
 * @pages:	returned scif_range structure
 *
 * scif_get_pages() returns the addresses of the physical pages represented by
 * those pages of the registered address space of the peer of epd, starting at
 * offset and continuing for len bytes. offset and len are constrained to be
 * multiples of the page size.
 *
 * All of the pages in the specified range [offset, offset + len - 1] must be
 * within a single window of the registered address space of the peer of epd.
 *
 * The addresses are returned as a virtually contiguous array pointed to by the
 * phys_addr component of the scif_range structure whose address is returned in
 * pages. The nr_pages component of scif_range is the length of the array. The
 * prot_flags component of scif_range holds the protection flag value passed
 * when the pages were registered.
 *
 * Each physical page whose address is returned by scif_get_pages() remains
 * available and will not be released for reuse until the scif_range structure
 * is returned in a call to scif_put_pages(). The scif_range structure returned
 * by scif_get_pages() must be unmodified.
 *
 * It is an error to call scif_close() on an endpoint on which a scif_range
 * structure of that endpoint has not been returned to scif_put_pages().
 *
 * Return:
 * Upon successful completion, scif_get_pages() returns 0; otherwise the
 * negative of one of the following errors is returned.
 * Errors:
 * ECONNRESET - Connection reset by peer.
 * EINVAL - offset is not a multiple of the page size, or offset is negative, or
 * len is not a multiple of the page size
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 * ENXIO - Offsets in the range [offset, offset + len - 1] are invalid
 * for the registered address space of the peer epd
 */
int scif_get_pages(scif_epd_t epd, off_t offset, size_t len,
		   struct scif_range **pages);

/**
 * scif_put_pages() - Remove references from remote registered pages
 * @pages:	pages to be returned
 *
 * scif_put_pages() releases a scif_range structure previously obtained by
 * calling scif_get_pages(). The physical pages represented by pages may
 * be reused when the window which represented those pages is unregistered.
 * Therefore, those pages must not be accessed after calling scif_put_pages().
 *
 * Return:
 * Upon successful completion, scif_put_pages() returns 0; otherwise the
 * negative of one of the following errors is returned.
 * Errors:
 * EINVAL - pages does not point to a valid scif_range structure, or
 * the scif_range structure pointed to by pages was already returned
 * ENODEV - The remote node is lost or existed, but is not currently in the
 * network since it may have crashed
 * ENOTCONN - The endpoint is not connected
 */
int scif_put_pages(struct scif_range *pages);

/**
 * scif_poll() - Wait for some event on an endpoint
 * @epds:	Array of endpoint descriptors
 * @nepds:	Length of epds
 * @timeout:	Upper limit on time for which scif_poll() will block
 *
 * scif_poll() waits for one of a set of endpoints to become ready to perform
 * an I/O operation.
 *
 * The epds argument specifies the endpoint descriptors to be examined and the
 * events of interest for each endpoint descriptor. epds is a pointer to an
 * array with one member for each open endpoint descriptor of interest.
 *
 * The number of items in the epds array is specified in nepds. The epd field
 * of scif_pollepd is an endpoint descriptor of an open endpoint. The field
 * events is a bitmask specifying the events which the application is
 * interested in. The field revents is an output parameter, filled by the
 * kernel with the events that actually occurred. The bits returned in revents
 * can include any of those specified in events, or one of the values EPOLLERR,
 * EPOLLHUP, or EPOLLNVAL. (These three bits are meaningless in the events
 * field, and will be set in the revents field whenever the corresponding
 * condition is true.)
 *
 * If none of the events requested (and no error) has occurred for any of the
 * endpoint descriptors, then scif_poll() blocks until one of the events occurs.
 *
 * The timeout argument specifies an upper limit on the time for which
 * scif_poll() will block, in milliseconds. Specifying a negative value in
 * timeout means an infinite timeout.
 *
 * The following bits may be set in events and returned in revents.
 * EPOLLIN - Data may be received without blocking. For a connected
 * endpoint, this means that scif_recv() may be called without blocking. For a
 * listening endpoint, this means that scif_accept() may be called without
 * blocking.
 * EPOLLOUT - Data may be sent without blocking. For a connected endpoint, this
 * means that scif_send() may be called without blocking. EPOLLOUT may also be
 * used to block waiting for a non-blocking connect to complete. This bit value
 * has no meaning for a listening endpoint and is ignored if specified.
 *
 * The following bits are only returned in revents, and are ignored if set in
 * events.
 * EPOLLERR - An error occurred on the endpoint
 * EPOLLHUP - The connection to the peer endpoint was disconnected
 * EPOLLNVAL - The specified endpoint descriptor is invalid.
 *
 * Return:
 * Upon successful completion, scif_poll() returns a non-negative value. A
 * positive value indicates the total number of endpoint descriptors that have
 * been selected (that is, endpoint descriptors for which the revents member is
 * non-zero). A value of 0 indicates that the call timed out and no endpoint
 * descriptors have been selected. Otherwise in user mode -1 is returned and
 * errno is set to indicate the error; in kernel mode the negative of one of
 * the following errors is returned.
 *
 * Errors:
 * EINTR - A signal occurred before any requested event
 * EINVAL - The nepds argument is greater than {OPEN_MAX}
 * ENOMEM - There was no space to allocate file descriptor tables
 */
int scif_poll(struct scif_pollepd *epds, unsigned int nepds, long timeout);

/**
 * scif_client_register() - Register a SCIF client
 * @client:	client to be registered
 *
 * scif_client_register() registers a SCIF client. The probe() method
 * of the client is called when SCIF peer devices come online and the
 * remove() method is called when the peer devices disappear.
 *
 * Return:
 * Upon successful completion, scif_client_register() returns a non-negative
 * value. Otherwise the return value is the same as subsys_interface_register()
 * in the kernel.
 */
int scif_client_register(struct scif_client *client);

/**
 * scif_client_unregister() - Unregister a SCIF client
 * @client:	client to be unregistered
 *
 * scif_client_unregister() unregisters a SCIF client.
 *
 * Return:
 * None
 */
void scif_client_unregister(struct scif_client *client);

#endif /* __SCIF_H__ */

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