On Mon, Aug 3, 2015 at 4:31 PM, Barry Grussling <barry@xxxxxxxxxxxxx> wrote: > On Mon, Aug 3, 2015 at 3:27 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: >> >> You might have a host bridge driver that knows how to set up the >> windows. Your dmesg logs mention altera_hps2fpga_bridge, which >> doesn't seem to be in the upstream kernel, so I don't know what it >> does. Please try to use echo 1 > /sys/devices/pci0000:00/000:02:0f.0/pci_bus/0000:08/rescan it will increase mmio range for 02:0f.0. If it does not work, you may need to try git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-pci-v4.3-next as it include one fix PCI: Treat optional as must in first try for bridge rescan https://git.kernel.org/cgit/linux/kernel/git/yinghai/linux-yinghai.git/patch/?id=f83b7ff4676da783f4615cb5e60102cd5181eee9 Also you turn off the power between the removal and rescan, you may need to boot with "pci=pcie_bus_perf" and use following patch that configure the MPSS to make it consistent between bridge and device. Subject: [PATCH] PCI: Configure MPS during rescan bus When we disable link and renable link of pcie downstream port, MPSS of device under the bridge could reset to 128. Just call pcie_bus_configure_settings just like boot path and hotplug path. Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> --- drivers/pci/probe.c | 11 +++++++++++ 1 file changed, 11 insertions(+) Index: linux-2.6/drivers/pci/probe.c =================================================================== --- linux-2.6.orig/drivers/pci/probe.c +++ linux-2.6/drivers/pci/probe.c @@ -2409,6 +2409,8 @@ unsigned int pci_rescan_bus_bridge_resiz pci_assign_unassigned_bridge_resources(bridge); + pcie_bus_configure_settings(bus); + pci_bus_add_devices(bus); return max; @@ -2429,6 +2431,15 @@ unsigned int pci_rescan_bus(struct pci_b max = pci_scan_child_bus(bus); pci_assign_unassigned_bus_resources(bus); + + if (pci_is_root_bus(bus)) { + struct pci_bus *child; + + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + } else + pcie_bus_configure_settings(bus); + pci_bus_add_devices(bus); return max; -- 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
