RE: [PATCH v4 1/7] usb/hcd-xhci: Make dma read/writes hooks pci free

[Sai Pavan Boddu]

Hi Philippe,

> -----Original Message-----
> From: Philippe Mathieu-Daudé <philmd@redhat.com>
> Sent: Tuesday, September 8, 2020 4:05 PM
> To: Sai Pavan Boddu <saipava@xilinx.com>; Peter Maydell
> <peter.maydell@linaro.org>; Markus Armbruster <armbru@redhat.com>;
> 'Marc-André Lureau' <marcandre.lureau@redhat.com>; Paolo Bonzini
> <pbonzini@redhat.com>; Gerd Hoffmann <kraxel@redhat.com>; Edgar
> Iglesias <edgari@xilinx.com>; Francisco Eduardo Iglesias
> <figlesia@xilinx.com>; David Gibson <david@gibson.dropbear.id.au>
> Cc: qemu-devel@nongnu.org; Alistair Francis <alistair.francis@wdc.com>;
> Eduardo Habkost <ehabkost@redhat.com>; Ying Fang
> <fangying1@huawei.com>; Vikram Garhwal <fnuv@xilinx.com>; Paul
> Zimmerman <pauldzim@gmail.com>
> Subject: Re: [PATCH v4 1/7] usb/hcd-xhci: Make dma read/writes hooks pci
> free
> 
> On 9/8/20 12:30 PM, Philippe Mathieu-Daudé wrote:
> >>> On 8/28/20 9:19 PM, Sai Pavan Boddu wrote:
> >>>> This patch starts making the hcd-xhci.c pci free, as part of this
> >>>> restructuring dma read/writes are handled without passing pci object.
> >>>>
> >>>> Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
> >>>> ---
> >>>>  hw/usb/hcd-xhci.c | 24 +++++++++++-------------  hw/usb/hcd-xhci.h
> >>>> |
> >>>> 3 +++
> >>>>  2 files changed, 14 insertions(+), 13 deletions(-)
> >>>>
> > [...]
> >>>> --- a/hw/usb/hcd-xhci.h
> >>>> +++ b/hw/usb/hcd-xhci.h
> >>>> @@ -22,6 +22,8 @@
> >>>>  #ifndef HW_USB_HCD_XHCI_H
> >>>>  #define HW_USB_HCD_XHCI_H
> >>>>
> >>>> +#include "sysemu/dma.h"
> >>>
> >>> AddressSpace is forward-declared in "qemu/typedefs.h", so no need to
> >>> include it here (yes in the sources including hcd-xhci.h).
> >> [Sai Pavan Boddu] Yes you are right!, but without this " dma_addr_t " is
> undefined.
> >> At this point of the patch, hcd-xhci.h is compiled along with pci.h which
> would provide 'dma_addr_t', but when we strip the pci wrapper around hcd-
> xhci we would miss it. Let me know, if its good to add later in the patch 
> series
> when the split happens.
> >
> > OK :( I'd prefer to only include "sysemu/dma.h" in hw/usb/hcd-xhci.c.
> >
> > Cc'ing David who added dma_addr_t in commit e5332e6334f
> > ("iommu: Introduce IOMMU emulation infrastructure"), it might be
> > simpler to move its declaration to "qemu/typedefs.h"
> > too.
> 
> Btw this type should be poisoned for user-mode.
[Sai Pavan Boddu] Thanks, I would try to define them in typedefs.h. 
BTW I'm not clear about poisoning then in user-mode. Do you mean hide these 
defines for user-mode ?

Regards
Sai Pavan
> 
> >
> > So no change needed for this patch.
> >
> >>
> >> Regards,
> >> Sai Pavan
> >>>
> >>> With that fixed:
> >>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> >>>
> >>>> +
> >>>>  #define TYPE_XHCI "base-xhci"
> >>>>  #define TYPE_NEC_XHCI "nec-usb-xhci"
> >>>>  #define TYPE_QEMU_XHCI "qemu-xhci"
> >>>> @@ -189,6 +191,7 @@ struct XHCIState {
> >>>>
> >>>>      USBBus bus;
> >>>>      MemoryRegion mem;
> >>>> +    AddressSpace *as;
> >>>>      MemoryRegion mem_cap;
> >>>>      MemoryRegion mem_oper;
> >>>>      MemoryRegion mem_runtime;
> >>>>
> >>
> >