MFC r337322:

Fix build of hyperv with base gcc on i386

Summary:
Base gcc fails to compile `sys/dev/hyperv/pcib/vmbus_pcib.c` for i386,
with the following -Werror warnings:

cc1: warnings being treated as errors
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'new_pcichild_device':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:567: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'vmbus_pcib_on_channel_callback':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:940: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'hv_pci_protocol_negotiation':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:1012: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'hv_pci_enter_d0':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:1073: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'hv_send_resources_allocated':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:1125: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c: In function 'vmbus_pcib_map_msi':
/usr/src/sys/dev/hyperv/pcib/vmbus_pcib.c:1730: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]

This is because on i386, several casts from `uint64_t` to a pointer
reduce the value from 64 bit to 32 bit.

For gcc, this can be fixed by an intermediate cast to uintptr_t. Note
that I am assuming the incoming values will always fit into 32 bit!

Differential Revision: https://reviews.freebsd.org/D15753

MFC 322488

hyperv: Update copyright for the files changed in 2017

Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D11982

MFC: 319690

r319690
hyperv/pcib: use the device serial number as PCI domain

Currently the PCI domain is initialized with the instance GUID in
vmbus_pcib_attach(). It turns out the GUID can change across VM reboot,
while some users want a persistent value for PCI domain. The solution is
that we can change to use the device serial number, which starts with 1
and is unique within a VM.

Obtained from: Haiyang Zhang
Sponsored by: Microsoft

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