On Mon, Aug 15, 2016 at 05:50:40PM +0100, Lorenzo Pieralisi wrote: > On ARM/ARM64 architectures, PCI IO ports are emulated through memory > mapped IO, by reserving a chunk of virtual address space starting at > PCI_IOBASE and by mapping the PCI host bridges memory address space > driving PCI IO cycles to it. > > PCI host bridge drivers that enable downstream PCI IO cycles map the > host bridge memory address responding to PCI IO cycles to the fixed > virtual address space through the pci_remap_iospace() API. > > This means that if the pci_remap_iospace() function fails, the > corresponding host bridge PCI IO resource must be considered invalid, in > that there is no way for the kernel to actually drive PCI IO transactions > if the memory addresses responding to PCI IO cycles cannot be mapped into > the CPU virtual address space. > > As a follow-up to the linux-pci mailing list thread ([0]), this series > fixes the pci_remap_iospace() failure paths by adding code that handles > the failures and takes the required actions. > > Compile tested on all affected PCI host controllers, testing and > reviewing much appreciated. > > [0] http://marc.info/?l=linux-pci&m=145816042427417&w=2 > > Lorenzo Pieralisi (6): > drivers: pci: host: aardvark: fix pci_remap_iospace() failure path > drivers: pci: host: designware: fix pci_remap_iospace() failure path > drivers: pci: host: versatile: fix pci_remap_iospace() failure path > drivers: pci: host: rcar: fix pci_remap_iospace() failure path > drivers: pci: host: common: fix pci_remap_iospace() failure path > drivers: pci: host: tegra: fix pci_remap_iospace() failure path > > drivers/pci/host/pci-aardvark.c | 8 +++++--- > drivers/pci/host/pci-host-common.c | 8 +++++--- > drivers/pci/host/pci-tegra.c | 7 +++++-- > drivers/pci/host/pci-versatile.c | 8 +++++--- > drivers/pci/host/pcie-designware.c | 21 ++++++++++++--------- > drivers/pci/host/pcie-rcar.c | 9 ++++++--- > 6 files changed, 38 insertions(+), 23 deletions(-) Applied to pci/enumeration for v4.9, thanks! -- 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
