[PATCH 7/8] xhci: translate virtual addresses into the bus's address space

[Bin Meng]

+Stefan

On Fri, Nov 20, 2020 at 1:49 AM Nicolas Saenz Julienne
<nsaenzjulienne at suse.de> wrote:
>
> So far we've been content with passing physical addresses when
> configuring memory addresses into XHCI controllers, but not all
> platforms have buses with transparent mappings. Specifically the
> Raspberry Pi 4 might introduce an offset to memory accesses incoming
> from its PCIe port.
>
> Introduce xhci_virt_to_bus() and xhci_bus_to_virt() to cater with these
> limitations and make sure we don't break non DM users.

I believe this was already addressed by Stefan before, to support xHCI in MIPS.

>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
> ---
>  drivers/usb/host/xhci-mem.c  | 45 +++++++++++++++++++-----------------
>  drivers/usb/host/xhci-ring.c | 11 +++++----
>  drivers/usb/host/xhci.c      |  4 ++--
>  include/usb/xhci.h           | 22 +++++++++++++++++-
>  4 files changed, 54 insertions(+), 28 deletions(-)
>

Regards,
Bin