On Mon, Dec 09, 2019 at 04:06:38PM +0000, Andre Przywara wrote: > From: Deepak Pandey <Deepak.Pandey@xxxxxxx> > > The Arm N1SDP SoC suffers from some PCIe integration issues, most > prominently config space accesses to not existing BDFs being answered > with a bus abort, resulting in an SError. "Do as I say, not as I do"? > To mitigate this, the firmware scans the bus before boot (catching the > SErrors) and creates a table with valid BDFs, which acts as a filter for > Linux' config space accesses. > > Add code consulting the table as an ACPI PCIe quirk, also register the > corresponding device tree based description of the host controller. > Also fix the other two minor issues on the way, namely not being fully > ECAM compliant and config space accesses being restricted to 32-bit > accesses only. > > This allows the Arm Neoverse N1SDP board to boot Linux without crashing > and to access *any* devices (there are no platform devices except UART). > > Signed-off-by: Deepak Pandey <Deepak.Pandey@xxxxxxx> > [Sudipto: extend to cover the CCIX root port as well] > Signed-off-by: Sudipto Paul <sudipto.paul@xxxxxxx> > [Andre: fix coding style issues, rewrite some parts, add DT support] > Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> > --- > arch/arm64/configs/defconfig | 1 + > drivers/acpi/pci_mcfg.c | 7 + > drivers/pci/controller/Kconfig | 11 ++ > drivers/pci/controller/Makefile | 1 + > drivers/pci/controller/pcie-n1sdp.c | 196 ++++++++++++++++++++++++++++ > include/linux/pci-ecam.h | 2 + > 6 files changed, 218 insertions(+) > create mode 100644 drivers/pci/controller/pcie-n1sdp.c Where can I buy one of these? They're "unreleased" according to: https://community.arm.com/developer/tools-software/oss-platforms/w/docs/440/neoverse-n1-sdp and I don't think we should wreck upstream because of a platform that doesn't exist. Will
