Hello Werner Zeh, Philipp Deppenwiese, build bot (Jenkins), Patrick Georgi, Martin Roth,
I'd like you to reexamine a change. Please visit
to look at the new patch set (#5).
Change subject: pciexp: Add support for allocating PCI express hotplug resources ......................................................................
pciexp: Add support for allocating PCI express hotplug resources
This change adds support for allocating resources for PCI express hotplug bridges when PCIEXP_HOTPLUG is selected. By default, this will add 32 PCI subordinate numbers (buses), 256 MiB of prefetchable memory, 8 MiB of non-prefetchable memory, and 8 KiB of I/O space to any device with the PCI_EXP_SLTCAP_HPC bit set in the PCI_EXP_SLTCAP register, which indicates hot-plugging capability. The resource allocation is configurable, please see the PCIEXP_HOTPLUG_* variables in src/device/Kconfig.
In order to support the allocation of hotplugged PCI buses, a new field is added to struct device called hotplug_buses. This is defaulted to zero, but when set, it adds the hotplug_buses value to the subordinate value of the PCI bridge. This allows devices to be plugged in and unplugged after boot.
This code was tested on the System76 Darter Pro (darp6). Before this change, there are not enough resources allocated to the Thunderbolt PCI bridge to allow plugging in new devices after boot. This can be worked around in the Linux kernel by passing a boot param such as: pci=assign-busses,hpbussize=32,realloc
This change makes it possible to use Thunderbolt hotplugging without kernel parameters, and attempts to match closely what our motherboard manufacturer's firmware does by default.
Signed-off-by: Jeremy Soller firstname.lastname@example.org Change-Id: I500191626584b83e6a8ae38417fd324b5e803afc --- M src/device/Kconfig M src/device/pci_device.c M src/device/pciexp_device.c M src/include/device/device.h M src/include/device/pci_def.h M src/include/device/pciexp.h 6 files changed, 120 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/46/35946/5