Several host bridge drivers (designware and all derivatives, iproc, xgene, xilinx, and xilinx-nwl) don't request the MMIO and I/O port windows they forward downstream to the PCI bus. That means the PCI core can't request resources for PCI bridge windows and PCI BARs. Several other drivers (altera, generic, mvebu, rcar, tegra) do request the windows, but use some duplicated code to do it. This adds a new devm_request_pci_bus_resources() interface and changes these drivers to use it. It also fixes several error paths where we failed to free the resource list allocated by of_pci_get_host_bridge_resources(). Tegra guys, please take a look at "PCI: tegra: Remove top-level resource from hierarchy" in particular. Removing the top-level resource definitely makes /proc/iomem look uglier (although it will look more like that of other drivers). A short-term fix could be to include device information in the resource name. I think a better long-term fix would be to make the DT or platform device core request all the resources from the DT. Comments welcome. I expect we'll trip over something here, so I marked this "v1" and I don't plan to put it into -next for a while. This is on my pci/host-request-windows branch, which you can pull or view at https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/host-request-windows --- Bjorn Helgaas (25): PCI: Add devm_request_pci_bus_resources() PCI: designware: Free bridge resource list on failure PCI: designware: Request host bridge window resources PCI: designware: Simplify host bridge window iteration PCI: iproc: Request host bridge window resources PCI: xgene: Free bridge resource list on failure PCI: xgene: Request host bridge window resources PCI: xilinx: Free bridge resource list on failure PCI: xilinx: Request host bridge window resources PCI: xilinx-nwl: Free bridge resource list on failure PCI: xilinx-nwl: Request host bridge window resources PCI: xilinx-nwl: Use dev_printk() when possible PCI: altera: Request host bridge window resources with core function PCI: altera: Simplify host bridge window iteration PCI: generic: Free resource list close to where it's allocated PCI: generic: Request host bridge window resources with core function PCI: generic: Simplify host bridge window iteration PCI: mvebu: Request host bridge window resources with core function PCI: rcar Gen2: Request host bridge window resources PCI: rcar: Request host bridge window resources with core function PCI: rcar: Simplify host bridge window iteration PCI: tegra: Remove top-level resource from hierarchy PCI: tegra: Request host bridge window resources with core function PCI: versatile: Request host bridge window resources with core function PCI: versatile: Simplify host bridge window iteration drivers/pci/bus.c | 29 +++++++++++++++++ drivers/pci/host/pci-host-common.c | 61 +++++++++++++++--------------------- drivers/pci/host/pci-mvebu.c | 17 ++++------ drivers/pci/host/pci-rcar-gen2.c | 4 ++ drivers/pci/host/pci-tegra.c | 35 +++------------------ drivers/pci/host/pci-versatile.c | 29 ++++++----------- drivers/pci/host/pci-xgene.c | 16 ++++++++- drivers/pci/host/pcie-altera.c | 35 ++++++--------------- drivers/pci/host/pcie-designware.c | 34 +++++++++++++------- drivers/pci/host/pcie-iproc.c | 4 ++ drivers/pci/host/pcie-rcar.c | 33 +++++-------------- drivers/pci/host/pcie-xilinx-nwl.c | 20 +++++++++--- drivers/pci/host/pcie-xilinx.c | 16 ++++++++- include/linux/pci.h | 5 ++- 14 files changed, 170 insertions(+), 168 deletions(-)
