x86/PCI: Add pci_numachip_init() declaration

numachip.c defines pci_numachip_init(), but neglected to include its
declaration, causing the following sparse and compile time warnings:

arch/x86/pci/numachip.c:108:12: warning: no previous prototype for function 'pci_numachip_init' [-Wmissing-prototypes]
arch/x86/pci/numachip.c:108:12: warning: symbol 'pci_numachip_init' was not declared. Should it be static?

Include asm/numachip/numachip.h, which includes the missing declaration.

Link: https://lore.kernel.org/r/20210812171717.1471243-1-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

x86/PCI: Add NumaChip SPDX GPL-2.0 to replace COPYING boilerplate

Add SPDX GPL-2.0 to numachip.c, which referred to the kernel default
"COPYING" file, which specifies GPL version 2.

Remove the boilerplate language referring to the GPL and "COPYING", relying
on the assertion in b24413180f56 ("License cleanup: add SPDX GPL-2.0
license identifier to files with no license") that the SPDX identifier may
be used instead of the full boilerplate text.

[bhelgaas: split to separate patch]
Link: https://lore.kernel.org/r/20190828135322.10370-1-kw@linux.com
Signed-off-by: Krzysztof Wilczynski <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

x86: numachip: APIC driver cleanups

Drop printing that serves no purpose, as it's printing fixed or known
values, and mark constant structure appropriately.

Signed-off-by: Daniel J Blueman <daniel@numascale.com>
Cc: Steffen Persvold <sp@numascale.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: http://lkml.kernel.org/r/1415089784-28779-3-git-send-email-daniel@numascale.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

x86/PCI: Add NumaChip remote PCI support

Add NumaChip-specific PCI access mechanism via MMCONFIG cycles, but
preventing access to AMD Northbridges which shouldn't respond.

Signed-off-by: Daniel J Blueman <daniel@numascale-asia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>