On Fri, Nov 03, 2017 at 02:47:05PM +0100, Niklas Cassel wrote: > Use the DMA-API to get the MSI address. This address will be written to > our PCI config space and to the register which determines which AXI > address the DWC IP will spoof for incoming MSI irqs. > > Since it is a PCIe endpoint device, rather than the CPU, that is supposed > to write to the MSI address, the proper way to get the MSI address is by > using the DMA API, not by using virt_to_phys(). > > Using virt_to_phys() might work on some systems, but using the DMA API > should work on all systems. > > This is essentially the same thing as allocating a buffer in a driver > to which the endpoint will write to. To do this, we use the DMA API. > > Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx> I'm expecting Jingoo and/or Joao to chime in and ack the DesignWare-related patches. I think all the others are in pretty good shape. > --- > drivers/pci/dwc/pcie-designware-host.c | 15 ++++++++++++--- > drivers/pci/dwc/pcie-designware.h | 3 ++- > 2 files changed, 14 insertions(+), 4 deletions(-) > ...
