Re: [PATCH v1 00/25] PCI: Request host bridge window resources

[Bjorn Helgaas]

On Mon, Jun 06, 2016 at 06:04:44PM -0500, Bjorn Helgaas wrote:
> 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

I merged this to my -next branch, so it should show up in linux-next
in a couple days.  Let me know if you see any problems.

> 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(-)
> 
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