MFC 318136

hyperv/vmbus: Reorganize vmbus device tree

For GEN1 Hyper-V, vmbus is attached to pcib0, which contains the
resources for PCI passthrough and SR-IOV. There is no
acpi_syscontainer0 on GEN1 Hyper-V.

For GEN2 Hyper-V, vmbus is attached to acpi_syscontainer0, which
contains the resources for PCI passthrough and SR-IOV. There is
no pcib0 on GEN2 Hyper-V.

The ACPI VMBUS device now only holds its _CRS, which is empty as
of this commit; its existence is mainly for upward compatibility.

Device tree structure is suggested by jhb@.

Tested-by: dexuan@
Collabrated-wth: dexuan@
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D10565

MFC: 308723-308725,308793-308795,309127

Approved by: sephe (mentor)

r308723
hyperv/vmbus: add a new method to get vcpu_id

vcpu_id is host's representation of guest CPU.
We get the mapping between vcpu_id and FreeBSD kernel's cpu id when VMBus
driver is loaded. Later, when a driver, like the coming pcib driver, talks
to the host and needs to refer to a guest CPU, the driver must use the
vcpu_id.

Reviewed by: jhb, sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8410

r308724
hyperv/vmbus: add new vmbus methods to support PCIe pass-through

The new methods will be used by the coming pcib driver.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8409

r308725
hyperv/pcib: enable PCIe pass-through (a.k.a. Discrete Device Assignment)

The feature enables us to pass through physical PCIe devices to FreeBSD VM
running on Hyper-V (Windows Server 2016) to get near-native performance with
low CPU utilization.

The patch implements a PCI bridge driver to support the feature:

1) The pcib driver talks to the host to discover device(s) and presents
the device(s) to FreeBSD's pci driver via PCI configuration space (note:
to access the configuration space, we don't use the standard I/O port
0xCF8/CFC method; instead, we use an MMIO-based method supplied by Hyper-V,
which is very similar to the 0xCF8/CFC method).

2) The pcib driver allocates resources for the device(s) and initialize
the related BARs, when the device driver's attach method is invoked;

3) The pcib driver talks to the host to create MSI/MSI-X interrupt
remapping between the guest and the host;

4) The pcib driver supports device hot add/remove.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8332

r308793
hyperv/pcib: Fix the build for some kernel configs

Add the dependency on pci explicitly for the pcib and vmbus drivers.
The related Makefiles are updated accordingly too.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft

r308794
hyperv/vmbus,pcib: Add MODULE_DEPEND on pci

We'd better add this dependency explicitly, though usually the pci
driver is built into the kernel by default.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft

r308795
hyperv/pcib: change the file name: pcib.c -> vmbus_pcib.c

This makes the file name and the variable naming in the file consistent.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft

r309127
hyperv/vmbus,pcib: unbreak build in case NEW_PCIB is undefined

vmbus_pcib requires NEW_PCIB, but in case that's not defined, we at
least shouldn't break build.

Reviewed by: sephe
Approved by: sephe (mentor)
Sponsored by: Microsoft

MFC 306484,306485

306484
hyperv/vmbus: Add missing vmbus_if.c to module build.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8067

306485
hyperv/hn: Add stubs for OFFLOAD_CURRENT_CONFIG and NETWORK_CHANGE status

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8068

MFC 303945,303947-303949,303989,303992,303998,304001,304002,304109,304111

303945
hyperv/vmbus: Add macro to get channel packet data length.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7455

303947
hyperv/vmbus: Add APIs for various types of transactions.

Reviewed by: Jun Su <junsu microsoft com>
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7456

303948
hyperv/hn: Switch to vmbus xact APIs for NVS initialization

Reviewed by: Jun Su <junsu microsoft com>
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7457

303949
hyperv/vmbus: Use xact APIs to implement post message Hypercall APIs

Avoid code duplication.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7458

303989
hyperv/hn: Simplify NDIS configuration.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7466

303992
hyperv/hn: Simplify NDIS initialization.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7467

303998
hyperv/hn: Switch to vmbus xact APIs for NVS RXBUF connection.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7469

304001
hyperv/hn: Switch to vmbus xact APIs for NVS chimney buffer connection.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7470

304002
hyperv/hn: Simplify RXBUF disconnection.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7472

304109
hyperv/hn: Simplify chimney sending buffer disconnection.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7479

304111
hyperv/hn: Switch to vmbus xact APIs for sub-channel alloc request.

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7480

MFC 303379

hyperv/vmbus: Rename cleaned up bufring code

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7318

MFC 303023

hyperv/vmbus: Rename laundered vmbus channel code

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D7232

MFC 302864

hyperv/vmbus: Merge hv_channel_mgmt.c into hv_channel.c

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D7126

MFC 302636-302638,302692

302636
hyperv/vmbus: Move channel map to vmbus_softc

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6982

302637
hyperv/vmbus: Remove needed bits

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D7002

302638
hyperv/vmbus: Destroy channel list lock upon attach failure and detach.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D7003

302692
hyperv/vmbus: Merge hv_connection.c into hv_channel.c

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D7004

MFC 302617-302621,302623,302629-302631

302617
hyperv/vmbus: Flatten channel message response processing.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6914

302618
hyperv/vmbus: Avoid tx_evtflags setting code duplication.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6915

302619
hyperv/vmbus: Busdma-fy Hypercall signal event input parameter.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6916

302620
hyperv: Nuke unused stuffs

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6917

302621
hyperv/vmbus: Don't be oversmart in default cpu selection.

Pin the channel to cpu0 by default. Drivers having special channel-cpu
mapping requirement should call vmbus_channel_cpu_{set,rr}() themselves.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6918

302623
hyperv/vmbus: Minor renaming

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6919

302629
hyperv/vmbus: Rework vmbus version accessing.

Instead of global variable, vmbus version is accessed through
a vmbus DEVMETHOD now.

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6953

302630
hyperv/vmbus: Move GPADL index into vmbus_softc

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6954

302631
hyperv/vmbus: Move channel list to vmbus_softc

Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6956

MFC 301483,301484,301487,301488,301583,301588

301483
hyperv: Move machine dependent bits into machine dependent files.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6701

301484
hyperv/vmbus: Define type for channel messages.

And fix message processing; only channel messages are supported.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6706

301487
hyperv/vmbus: Factor out channel message processing

This paves the way for further cleanup.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6707

301488
hyperv/vmbus: Constify channel message

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6708

301583
hyperv/vmbus: Busdma-fy MNF and event flags.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6744

301588
hyperv/vmbus: Change tx_evtflags type to u_long to match vmbus_evtflags

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6745

MFC 301113

hyperv: Rename some cleaned up/almost cleaned up files

MFC after: 1 week
Sponsored by: Microsoft OSTC

MFC 300478,300479

300478
hyperv: Add helpers for busdma(9) operation

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6443

300479
hyperv/hn: Use hyperv busdma(9) helper.

MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6444

MFC 297931,298022

297931
Expose doreti as a global symbol on amd64 and i386.

doreti provides the common code path for returning from interrupt
andlers on x86. Exposing doreti as a global symbol allows kernel
modules to include low-level interrupt handlers instead of requiring
all low-level handlers to be statically compiled into the kernel.

Submitted by: Howard Su <howard0su@gmail.com>
Reviewed by: kib

298022
hyperv: Deprecate HYPERV option by moving Hyper-V IDT vector into vmbus

Submitted by: Jun Su <junsu microsoft com>
Reviewed by: jhb, kib, sephe
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D5910

MFC [Hyper-V]: r293719-r293722, r293869-r293871, r293873-r293875, r293877

r293719 hyperv/hn: Implement LRO
r293720 hyperv/hn: Implement SIOC[SG]IFMEDIA support
r293721 hyperv/hn: Avoid mbuf cluster allocation, if the packet is small.
r293722 hyperv/hn: Removed unused netvsc_init()
r293869 hyperv/hn: Unbreak LINT-NOIP
r293870 hyperv: use x86 generic code to do the hypervisor detection
r293871 hyperv: remove unused vmbus definitions
r293873 hyperv: implement an event timer
r293874 hyperv: add interrupt counters
r293875 hyperv: set receive buffer size according to NVSP protocol version
r293877 Unbreak `make depend` with sys/modules/hyperv/vmbus after r293870

Approved by: re (glebius), adrian (mentor)
Sponsored by: Microsoft OSTC

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix make depend, apply a bit of style.

Approved by: re (marius)
Reviewed by: grehan

Import Hyper-V paravirtualized drivers from projects/hyperv
branch into head.

Approved by: re@ (hrs)
Obtained from: Microsoft, NetApp, and Citrix.

Microsoft have changed their policy on how the hyper-v code will
be pulled into FreeBSD. From now, FreeBSD will be considered the
upstream repo.

First step: move the drivers away from the contrib area and into
the base system.

A follow-on commit will include the drivers in the amd64 GENERIC kernel.

make glue to hook up the hyperv kmods to the build.

Modified from the original Microsoft versions to pull
code/headers in from the sys/contrib/dev directory.