usb: implement XHCI underrun/overrun events

Implement underrun/overrun events of isochronous endpoints
according to XHCI spec (4.10.3.1)
Guest software restarts data streaming when receives these events.
The XHCI reports these events using interrupter assigned
to the slot (as these events do not have TRB), so current
commit adds the field of assigned interrupter to the
XHCISlot structure. Guest software assigns interrupter to the
slot on 'Address Device' and 'Evaluate Context' commands.
Signed-off-by: NYuri Benditovich <yuri.benditovich@janustech.com>
Message-id: 20190128200444.5128-3-yuri.benditovich@janustech.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-xhci.c

@@ -1949,6 +1949,16 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid)
     while (1) {
         length = xhci_ring_chain_length(xhci, ring);
         if (length <= 0) {
+            if (epctx->type == ET_ISO_OUT || epctx->type == ET_ISO_IN) {
+                /* 4.10.3.1 */
+                XHCIEvent ev = { ER_TRANSFER };
+                ev.ccode  = epctx->type == ET_ISO_IN ?
+                    CC_RING_OVERRUN : CC_RING_UNDERRUN;
+                ev.slotid = epctx->slotid;
+                ev.epid   = epctx->epid;
+                ev.ptr    = epctx->ring.dequeue;
+                xhci_event(xhci, &ev, xhci->slots[epctx->slotid-1].intr);
+            }
             break;
         }
         xfer = xhci_ep_alloc_xfer(epctx, length);
@@ -2028,6 +2038,7 @@ static TRBCCode xhci_disable_slot(XHCIState *xhci, unsigned int slotid)
     xhci->slots[slotid-1].enabled = 0;
     xhci->slots[slotid-1].addressed = 0;
     xhci->slots[slotid-1].uport = NULL;
+    xhci->slots[slotid-1].intr = 0;
     return CC_SUCCESS;
 }
 
@@ -2127,6 +2138,7 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
     slot = &xhci->slots[slotid-1];
     slot->uport = uport;
     slot->ctx = octx;
+    slot->intr = get_field(slot_ctx[2], TRB_INTR);
 
     /* Make sure device is in USB_STATE_DEFAULT state */
     usb_device_reset(dev);
@@ -2300,8 +2312,9 @@ static TRBCCode xhci_evaluate_slot(XHCIState *xhci, unsigned int slotid,
 
         slot_ctx[1] &= ~0xFFFF; /* max exit latency */
         slot_ctx[1] |= islot_ctx[1] & 0xFFFF;
-        slot_ctx[2] &= ~0xFF00000; /* interrupter target */
-        slot_ctx[2] |= islot_ctx[2] & 0xFF000000;
+        /* update interrupter target field */
+        xhci->slots[slotid-1].intr = get_field(islot_ctx[2], TRB_INTR);
+        set_field(&slot_ctx[2], xhci->slots[slotid-1].intr, TRB_INTR);
 
         DPRINTF("xhci: output slot context: %08x %08x %08x %08x\n",
                 slot_ctx[0], slot_ctx[1], slot_ctx[2], slot_ctx[3]);

hw/usb/hcd-xhci.h

@@ -140,6 +140,7 @@ typedef struct XHCIPort {
 typedef struct XHCISlot {
     bool enabled;
     bool addressed;
+    uint16_t intr;
     dma_addr_t ctx;
     USBPort *uport;
     XHCIEPContext *eps[31];