usb: unique packet ids

This patch adds IDs to usb packets.  Those IDs are (a) supposed to be
unique for the lifecycle of a packet (from packet setup until the packet
is either completed or canceled) and (b) stable across migration.

uhci, ohci, ehci and xhci use the guest physical address of the transfer
descriptor for this.

musb needs a different approach because there is no transfer descriptor.
But musb also doesn't support pipelining, so we have never more than one
packet per endpoint in flight.  So we go create an ID based on endpoint
and device address.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/hw/usb.h b/hw/usb.h
index e574477..b8fceec 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -332,6 +332,7 @@ typedef enum USBPacketState {
 struct USBPacket {
     /* Data fields for use by the driver.  */
     int pid;
+    uint64_t id;
     USBEndpoint *ep;
     QEMUIOVector iov;
     uint64_t parameter; /* control transfers */
@@ -344,7 +345,7 @@ struct USBPacket {
 void usb_packet_init(USBPacket *p);
 void usb_packet_set_state(USBPacket *p, USBPacketState state);
 void usb_packet_check_state(USBPacket *p, USBPacketState expected);
-void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep);
+void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep, uint64_t id);
 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len);
 int usb_packet_map(USBPacket *p, QEMUSGList *sgl);
 void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl);