usb: Convert usb_packet_{map, unmap} to universal DMA helpers

The USB UHCI and EHCI drivers were converted some time ago to use the
pci_dma_*() helper functions.  However, this conversion was not complete
because in some places both these drivers do DMA via the usb_packet_map()
function in usb-libhw.c.  That function directly used
cpu_physical_memory_map().

Now that the sglist code uses DMA wrappers properly, we can convert the
functions in usb-libhw.c, thus conpleting the conversion of UHCI and EHCI
to use the DMA wrappers.

Note that usb_packet_map() invokes dma_memory_map() with a NULL invalidate
callback function.  When IOMMU support is added, this will mean that
usb_packet_map() and the corresponding usb_packet_unmap() must be called in
close proximity without dropping the qemu device lock - otherwise the guest
might invalidate IOMMU mappings while they are still in use by the device
code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 6d2d54940d..1582c2c69e 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1426,8 +1426,8 @@ static void ehci_execute_complete(EHCIQueue *q)
         set_field(&q->qh.token, p->tbytes, QTD_TOKEN_TBYTES);
     }
     ehci_finish_transfer(q, p->usb_status);
+    usb_packet_unmap(&p->packet, &p->sgl);
     qemu_sglist_destroy(&p->sgl);
-    usb_packet_unmap(&p->packet);
 
     q->qh.token ^= QTD_TOKEN_DTOGGLE;
     q->qh.token &= ~QTD_TOKEN_ACTIVE;
@@ -1551,7 +1551,7 @@ static int ehci_process_itd(EHCIState *ehci,
                 usb_packet_map(&ehci->ipacket, &ehci->isgl);
                 ret = usb_handle_packet(dev, &ehci->ipacket);
                 assert(ret != USB_RET_ASYNC);
-                usb_packet_unmap(&ehci->ipacket);
+                usb_packet_unmap(&ehci->ipacket, &ehci->isgl);
             } else {
                 DPRINTF("ISOCH: attempt to addess non-iso endpoint\n");
                 ret = USB_RET_NAK;