[XS] Change in coreboot[main]: device/Kconfig: Make option to allocate above 4G appear in Kconfig

[Matt DeVillier (Code Review)]

Matt DeVillier has submitted this change. ( https://review.coreboot.org/c/coreboot/+/86131?usp=email )

Change subject: device/Kconfig: Make option to allocate above 4G appear in Kconfig
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device/Kconfig: Make option to allocate above 4G appear in Kconfig

Previously only tested on server platforms - it wasn't working correctly
on consumer platforms due to missing boolean.

This patch fixes it, which makes resource allocator use uint64 instead
of uint32. Thanks to that, modern GPUs like Intel Arc or Radeon RX now
work correctly with ReBAR enabled, and correctly initialize the
framebuffer in payload (i.e EDK2) after initializing the OpROMs.

Example of issue caused by resource allocator using uint32 (Intel Arc
A580):
[ERROR]  Resource didn't fit!!!
[ERROR]  PCI: 00:01:00.0 10 prefmem64 size: 0x0000800000 not assigned
[ERROR]  PCI: 00:03:00.0 18 prefmem64 size: 0x0200000000 not assigned

(Followed by Linux reporting that BAR space was limited to 256MB, which
severely hindered the performance).

TESTed on Intel Tiger Lake-H (mb/erying/tgl) with Intel Arc A580 and AMD
Radeon RX7800XT.

Change-Id: Ia17b3312016409d8fd6bcce4321481a7b7e35ce5
Signed-off-by: Alicja Michalska 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86131
Tested-by: build bot (Jenkins) 
Reviewed-by: Maximilian Brune 
Reviewed-by: Matt DeVillier 
---
M src/device/Kconfig
1 file changed, 6 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Matt DeVillier: Looks good to me, approved
  Maximilian Brune: Looks good to me, approved

diff --git a/src/device/Kconfig b/src/device/Kconfig
index af3fe80..bfb38b4 100644
--- a/src/device/Kconfig
+++ b/src/device/Kconfig
@@ -1005,10 +1005,15 @@

config ALWAYS_ALLOW_ABOVE_4G_ALLOCATION
    bool
+	prompt "Extend resource window for PCIe devices above 4G" if ARCH_X86
    default n if ARCH_X86
    default y
    help
-	  Don't limit mem resources to 4G, but to their actual limit.
+	  This option extends PCIe resource allocation beyond the 4G limit.
+	  Required for modern graphics cards that support resizable BAR, such as
+	  Intel Arc or AMD RX series.
+	  Please keep in mind that not all payloads support it
+	  (i.e: LinuxBoot and EDK2 do, GRUB doesn't).

config XHCI_UTILS
    def_bool n