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device/Kconfig: Reduce PCIe hotplug bus numbers and IO resources 

The rationale behind this change is that multiple nested bridges using a
lot of bus numbers and IO resources is not likely to be a common hotplug
setup. When there is a large amount of hotplug ports using 32
subordinate busses results in boot failures (e.g. make qemu). 8K IO
busses for hotplug devices is also excessive in most use cases when only
64K is available in total (again make qemu results in failure to
allocate resources but does boot to payload).

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I8371958037d479e7d2053f49814735e15461ca6e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74774
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Arthur Heymans 2023-04-26 09:41:54 +02:00 committed by Lean Sheng Tan
parent 3553a16003
commit caf27adb1b
1 changed files with 4 additions and 6 deletions
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10
src/device/Kconfig
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@ -703,12 +703,10 @@ if PCIEXP_HOTPLUG
config PCIEXP_HOTPLUG_BUSES config PCIEXP_HOTPLUG_BUSES
int "PCI Express Hotplug Buses" int "PCI Express Hotplug Buses"
default 8 if ECAM_MMCONF_SUPPORT && ECAM_MMCONF_BUS_NUMBER <= 64 default 8
default 16 if ECAM_MMCONF_SUPPORT && ECAM_MMCONF_BUS_NUMBER <= 128
default 32
help help
This is the number of buses allocated for hotplug PCI express This is the number of buses allocated for hotplug PCI express
bridges, for use by hotplugged child devices. The default is 32 bridges, for use by hotplugged child devices. The default is 8
buses. buses.
config PCIEXP_HOTPLUG_MEM config PCIEXP_HOTPLUG_MEM
@ -745,11 +743,11 @@ config PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G
config PCIEXP_HOTPLUG_IO config PCIEXP_HOTPLUG_IO
hex "PCI Express Hotplug I/O Space" hex "PCI Express Hotplug I/O Space"
default 0x2000 default 0x800
help help
This is the amount of I/O space to allocate to hot-plug PCI This is the amount of I/O space to allocate to hot-plug PCI
express bridges, for use by hotplugged child devices. The default express bridges, for use by hotplugged child devices. The default
is 8 KiB. is 2 KiB.
endif # PCIEXP_HOTPLUG endif # PCIEXP_HOTPLUG