[PATCH v1 0/3] PCI: Configure PCIe MPS settings

[Bjorn Helgaas]

On Wed, Feb 08, 2017 at 04:49:22PM -0600, Bjorn Helgaas wrote:
> [Some of you will get this twice because Gmail and I aren't getting along
> today; sorry]
> 
> The PCI core doesn't configure the PCIe MPS settings by itself.  Each
> host bridge driver has to call pcie_bus_configure_settings() to make
> this happen.
> 
> Jon fixed this already for pcie-iproc.c.  I propose these similar
> patches for other drivers.
> 
> HV guys, I included you because create_root_hv_pci_bus() is one place
> that calls pci_scan_child_bus() but does not call
> pcie_bus_configure_settings().  I know you probably don't strictly
> *need* to configure MPS settings in a paravirtual front-end, but the
> PCI core does other device configuration in this path:
> 
>   pci_scan_child_bus
>     pci_scan_slot
>       pci_scan_single_device
>         pci_device_add
>           pci_configure_device
>           pci_init_capabilities
> 
> and I would like to eventually migrate the MPS configuration into that
> same path.  Since we do this other configuration for HV devices
> already, I think pcie_bus_configure_settings() should also work (even
> if it ends up not doing anything to real devices).
> 
> It would make that eventual migration easier if all the
> pci_scan_child_bus() callers had the same pattern of calling
> pcie_bus_configure_settings().
> 
> So would it make sense to make a similar patch for HV?  It looks easy
> to add it to create_root_hv_pci_bus(), but I don't know exactly what
> to do about pci_devices_present_work().
> 
> ---
> 
> Bjorn Helgaas (3):
>       PCI: xilinx: Configure PCIe MPS settings
>       PCI: versatile: Configure PCIe MPS settings
>       PCI: xgene: Configure PCIe MPS settings
> 
> 
>  drivers/pci/host/pci-versatile.c |    4 +++-
>  drivers/pci/host/pci-xgene.c     |    4 +++-
>  drivers/pci/host/pcie-xilinx.c   |    4 +++-
>  3 files changed, 9 insertions(+), 3 deletions(-)

I applied these to pci/host-xilinx, pci/host-versatile, and
pci/host-xgene, respectively, for v4.11.