Change in coreboot[master]: device: Add support for PCIe Resizable BARs

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Subrata Banik, Tim Wawrzynczak, Angel Pons, Arthur Heymans, Nick Vaccaro, Kyösti Mälkki.
Hello build bot (Jenkins), Nico Huber, Subrata Banik, Angel Pons, Arthur Heymans, Nick Vaccaro, Kyösti Mälkki,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/61215

to look at the new patch set (#3).

Change subject: device: Add support for PCIe Resizable BARs
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device: Add support for PCIe Resizable BARs

Section 7.8.6 of the PCIe spec (rev 4) indicates that some devices can
indicates support for "Resizable BARs" via a PCIe extended capability.

When support this capability is indicated by the device, the size of
each BAR is determined in a different way than the normal "moving
bits" method. Instead, a pair of capability and control registers is
allocated in config space for each BAR, which can be used to both
indicate the different sizes the device is capable of supporting for
the BAR (powers-of-2 number of bits from 20 [1 MiB] to 63 [8 EiB]), and
to also inform the device of the size that the allocator actually
reserved for the MMIO range.

This patch adds a Kconfig for a mainboard to select if it knows that it
will have a device that requires this support during PCI enumeration.
If so, there is a corresponding Kconfig to indicate the maximum number
of bits of address space to hand out to devices this way (again, limited
by what devices can support and each individual system may want to
support, but just like above, this number can range from 20 to 63) If
the device can support more bits than this Kconfig, the resource request
is truncated to the number indicated by this Kconfig.

BUG=b:214443809
TEST=compile (device with this capability not available yet),
also verify that no changes are seen in resource allocation for
google/brya0 before and after this change.

Signed-off-by: Tim Wawrzynczak 
Change-Id: I14fcbe0ef09fdc7f6061bcf7439d1160d3bc4abf
---
M src/device/Kconfig
M src/device/pci_device.c
M src/include/device/pci_def.h
M src/include/device/resource.h
4 files changed, 180 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/15/61215/3