Hi all, This is fourth iteration of the patch series trying to solve the problem reported by Chris Chiu [1]. In summary the current resource distribution code does not cover the initial device enumeration so if we find unconfigured bridges they get the bare minimum. In addition to that it turned out the current resource distribution code does not take into account possible multifunction devices and/or other devices on the bus. The patch 1/2 tries to make it more generic. I've tested it on QEMU following the topology Jonathan is using and also in a a couple of systems with Thunderbolt controller and complex topologies to make sure it still keeps working. The previous versions of the series can be found: v3: https://lore.kernel.org/linux-pci/20221130112221.66612-1-mika.westerberg@xxxxxxxxxxxxxxx/ v2: https://lore.kernel.org/linux-pci/20221114115953.40236-1-mika.westerberg@xxxxxxxxxxxxxxx/ v1: https://lore.kernel.org/linux-pci/20221103103254.30497-1-mika.westerberg@xxxxxxxxxxxxxxx/ Changes from v3: * Make it more generic and not depend on how many bridges there are on the bus. Changes from v2: * Make both patches to work with PCI devices too (do not expect that the bridge is always first device on the bus). * Allow distribution with bridges that do not have all resource windows programmed (therefore the patch 2/2 is not revert anymore) * I did not add the tags from Rafael and Jonathan because the code is not exactly the same anymore so was not sure if they still apply. Changes from v1: * Re-worded the commit message to hopefully explain the problem better * Added Link: to the bug report * Update the comment according to Bjorn's suggestion * Dropped the ->multifunction check * Use %#llx in log format. [1] https://bugzilla.kernel.org/show_bug.cgi?id=216000 Mika Westerberg (2): PCI: Take other bus devices into account when distributing resources PCI: Distribute available resources for root buses too drivers/pci/setup-bus.c | 262 ++++++++++++++++++++++++++++------------ 1 file changed, 185 insertions(+), 77 deletions(-) -- 2.35.1
