On Fri, Jul 15, 2016 at 01:33:32PM -0700, Kallol Biswas wrote: > Hi, > I have been trying to hot-add a PCIe bridge and getting the > following message in dmesg: > > No bus number available for hot-added bridge 0000:06:00. > > The kernel is 4.4. Do we have any patch for this? I tried Yinghai's > for-pci-busn-alloc patch. Did not work. Not sure I picked up the right > changes. As far as I know there is not a patch for this. We probably should reserve some bus number space just like we do for memory and I/O space, but I don't think we do that today. One workaround would be to have firmware configure the upstream bridges (05:00.0 and the path leading to it) with larger bus number apertures. > [ 793.982780] pciehp 0000:05:00.0:pcie24: pciehp_check_link_active: > lnk_status = a103 > [ 793.982783] pciehp 0000:05:00.0:pcie24: slot(0-1): Link Up event > [ 793.982815] pciehp 0000:05:00.0:pcie24: pciehp_get_power_status: > SLOTCTRL 80 value read 1571 > [ 793.982835] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010 > from Slot Status > [ 793.982841] pciehp 0000:05:00.0:pcie24: pciehp_power_on_slot: > SLOTCTRL 80 write cmd 0 > [ 793.982847] pciehp 0000:05:00.0:pcie24: __pciehp_link_set: lnk_ctrl = 0 > [ 793.982859] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010 > from Slot Status > [ 793.982865] pciehp 0000:05:00.0:pcie24: pciehp_green_led_blink: > SLOTCTRL 80 write cmd 200 > [ 793.982871] pciehp 0000:05:00.0:pcie24: pciehp_check_link_active: > lnk_status = a103 > [ 794.085818] pciehp 0000:05:00.0:pcie24: pciehp_check_link_status: > lnk_status = a103 > [ 794.085909] pci 0000:06:00.0: [10b5:9797] type 01 class 0x060400 > [ 794.086232] pci 0000:06:00.0: Max Payload Size set to 256 (was 128, max 512) > [ 794.086563] pci 0000:06:00.0: PME# supported from D0 D3hot D3cold > [ 794.086884] iommu: Adding device 0000:06:00.0 to group 47 > [ 794.093797] No bus number available for hot-added bridge 0000:06:00.0 > [ 794.093816] pcieport 0000:05:00.0: PCI bridge to [bus 06] > [ 794.093822] pcieport 0000:05:00.0: bridge window [io 0x1000-0x1fff] > [ 794.093829] pcieport 0000:05:00.0: bridge window [mem > 0xc8000000-0xc83fffff] > [ 794.093835] pcieport 0000:05:00.0: bridge window [mem > 0x280000000-0x2801fffff 64bit pref] > [ 794.094364] pciehp 0000:05:00.0:pcie24: pending interrupts 0x0010 > from Slot Status > [ 794.094369] pciehp 0000:05:00.0:pcie24: pciehp_green_led_on: > SLOTCTRL 80 write cmd 100 > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
