| Message ID | 20220905080232.36087-1-mika.westerberg@linux.intel.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | PCI: Allow for future resource expansion on initial root bus scan | expand |
On Mon, Sep 05, 2022 at 11:02:26AM +0300, Mika Westerberg wrote: > Hi, > > The series works around an issue found on some Dell systems where > booting with Thunderbolt/USB4 devices connected the BIOS leaves some of > the PCIe devices unconfigured. If the connected devices that are not > configured have PCIe hotplug ports as well the initial root bus scan > only reserves the minimum amount of resources to them making any > expansion happening later impossible. > > We do already distribute the "spare" resources between hotplug ports on > hot-add but we have not done that upon the initial scan. The first four > patches make the initial root bus scan path to do the same. > > The additional patches are just a small cleanups that can be applied > separately too. > > The related bug: https://bugzilla.kernel.org/show_bug.cgi?id=216000. > > The previous version of the patch series can be found here: > > https://lore.kernel.org/linux-pci/20220816100740.68667-1-mika.westerberg@linux.intel.com/ > > Changes from the previous version: > > * Split patch 3 into two: move and then the actual fix as suggested by > Andy. > * Fold the two whitespace fixes into one patch. > * Added tags from Chris and Andy. > > Mika Westerberg (6): > PCI: Fix used_buses calculation in pci_scan_child_bus_extend() > PCI: Pass available buses also when the bridge is already configured > PCI: Move pci_assign_unassigned_root_bus_resources() > PCI: Distribute available resources for root buses too > PCI: Fix whitespace and indentation > PCI: Fix typo in pci_scan_child_bus_extend() > > drivers/pci/probe.c | 13 +- > drivers/pci/setup-bus.c | 290 ++++++++++++++++++++++++---------------- > 2 files changed, 181 insertions(+), 122 deletions(-) Applied to pci/resource for v6.1, thanks, Mika!
Hi, The series works around an issue found on some Dell systems where booting with Thunderbolt/USB4 devices connected the BIOS leaves some of the PCIe devices unconfigured. If the connected devices that are not configured have PCIe hotplug ports as well the initial root bus scan only reserves the minimum amount of resources to them making any expansion happening later impossible. We do already distribute the "spare" resources between hotplug ports on hot-add but we have not done that upon the initial scan. The first four patches make the initial root bus scan path to do the same. The additional patches are just a small cleanups that can be applied separately too. The related bug: https://bugzilla.kernel.org/show_bug.cgi?id=216000. The previous version of the patch series can be found here: https://lore.kernel.org/linux-pci/20220816100740.68667-1-mika.westerberg@linux.intel.com/ Changes from the previous version: * Split patch 3 into two: move and then the actual fix as suggested by Andy. * Fold the two whitespace fixes into one patch. * Added tags from Chris and Andy. Mika Westerberg (6): PCI: Fix used_buses calculation in pci_scan_child_bus_extend() PCI: Pass available buses also when the bridge is already configured PCI: Move pci_assign_unassigned_root_bus_resources() PCI: Distribute available resources for root buses too PCI: Fix whitespace and indentation PCI: Fix typo in pci_scan_child_bus_extend() drivers/pci/probe.c | 13 +- drivers/pci/setup-bus.c | 290 ++++++++++++++++++++++++---------------- 2 files changed, 181 insertions(+), 122 deletions(-)