xhci: trace debug statements for urb cancellation

This patch defines a new trace event, which is called xhci_dbg_cancel_urb
and belongs to the event class xhci_log_msg, and adds tracepoints that
trace the debug messages related to the removal of a cancelled URB from
the endpoint's transfer ring.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 86971ac..f908e20 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -556,7 +556,8 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
                return;
        }
        state->new_cycle_state = 0;
-       xhci_dbg(xhci, "Finding segment containing stopped TRB.\n");
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Finding segment containing stopped TRB.");
        state->new_deq_seg = find_trb_seg(cur_td->start_seg,
                        dev->eps[ep_index].stopped_trb,
                        &state->new_cycle_state);
@@ -566,12 +567,14 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
        }
 
        /* Dig out the cycle state saved by the xHC during the stop ep cmd */
-       xhci_dbg(xhci, "Finding endpoint context\n");
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Finding endpoint context");
        ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
        state->new_cycle_state = 0x1 & le64_to_cpu(ep_ctx->deq);
 
        state->new_deq_ptr = cur_td->last_trb;
-       xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n");
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Finding segment containing last TRB in TD.");
        state->new_deq_seg = find_trb_seg(state->new_deq_seg,
                        state->new_deq_ptr,
                        &state->new_cycle_state);
@@ -598,13 +601,16 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
        if (ep_ring->first_seg == ep_ring->first_seg->next &&
                        state->new_deq_ptr < dev->eps[ep_index].stopped_trb)
                state->new_cycle_state ^= 0x1;
-       xhci_dbg(xhci, "Cycle state = 0x%x\n", state->new_cycle_state);
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Cycle state = 0x%x", state->new_cycle_state);
 
        /* Don't update the ring cycle state for the producer (us). */
-       xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "New dequeue segment = %p (virtual)",
                        state->new_deq_seg);
        addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
-       xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "New dequeue pointer = 0x%llx (DMA)",
                        (unsigned long long) addr);
 }
 
@@ -632,9 +638,11 @@ static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
                        if (flip_cycle)
                                cur_trb->generic.field[3] ^=
                                        cpu_to_le32(TRB_CYCLE);
-                       xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
-                       xhci_dbg(xhci, "Address = %p (0x%llx dma); "
-                                       "in seg %p (0x%llx dma)\n",
+                       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                                       "Cancel (unchain) link TRB");
+                       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                                       "Address = %p (0x%llx dma); "
+                                       "in seg %p (0x%llx dma)",
                                        cur_trb,
                                        (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
                                        cur_seg,
@@ -652,7 +660,8 @@ static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
                                        cpu_to_le32(TRB_CYCLE);
                        cur_trb->generic.field[3] |= cpu_to_le32(
                                TRB_TYPE(TRB_TR_NOOP));
-                       xhci_dbg(xhci, "TRB to noop at offset 0x%llx\n",
+                       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                                       "TRB to noop at offset 0x%llx",
                                        (unsigned long long)
                                        xhci_trb_virt_to_dma(cur_seg, cur_trb));
                }
@@ -673,8 +682,9 @@ void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
 {
        struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
 
-       xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
-                       "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
+                       "new deq ptr = %p (0x%llx dma), new cycle = %u",
                        deq_state->new_deq_seg,
                        (unsigned long long)deq_state->new_deq_seg->dma,
                        deq_state->new_deq_ptr,
@@ -794,7 +804,8 @@ static void handle_stopped_endpoint(struct xhci_hcd *xhci,
         */
        list_for_each(entry, &ep->cancelled_td_list) {
                cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
-               xhci_dbg(xhci, "Removing canceled TD starting at 0x%llx (dma).\n",
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "Removing canceled TD starting at 0x%llx (dma).",
                                (unsigned long long)xhci_trb_virt_to_dma(
                                        cur_td->start_seg, cur_td->first_trb));
                ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb);
@@ -914,14 +925,16 @@ void xhci_stop_endpoint_command_watchdog(unsigned long arg)
 
        ep->stop_cmds_pending--;
        if (xhci->xhc_state & XHCI_STATE_DYING) {
-               xhci_dbg(xhci, "Stop EP timer ran, but another timer marked "
-                               "xHCI as DYING, exiting.\n");
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "Stop EP timer ran, but another timer marked "
+                               "xHCI as DYING, exiting.");
                spin_unlock_irqrestore(&xhci->lock, flags);
                return;
        }
        if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
-               xhci_dbg(xhci, "Stop EP timer ran, but no command pending, "
-                               "exiting.\n");
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "Stop EP timer ran, but no command pending, "
+                               "exiting.");
                spin_unlock_irqrestore(&xhci->lock, flags);
                return;
        }
@@ -963,8 +976,9 @@ void xhci_stop_endpoint_command_watchdog(unsigned long arg)
                        ring = temp_ep->ring;
                        if (!ring)
                                continue;
-                       xhci_dbg(xhci, "Killing URBs for slot ID %u, "
-                                       "ep index %u\n", i, j);
+                       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                                       "Killing URBs for slot ID %u, "
+                                       "ep index %u", i, j);
                        while (!list_empty(&ring->td_list)) {
                                cur_td = list_first_entry(&ring->td_list,
                                                struct xhci_td,
@@ -987,9 +1001,11 @@ void xhci_stop_endpoint_command_watchdog(unsigned long arg)
                }
        }
        spin_unlock_irqrestore(&xhci->lock, flags);
-       xhci_dbg(xhci, "Calling usb_hc_died()\n");
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Calling usb_hc_died()");
        usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
-       xhci_dbg(xhci, "xHCI host controller is dead.\n");
+       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "xHCI host controller is dead.");
 }
 
 
@@ -1093,7 +1109,8 @@ static void handle_set_deq_completion(struct xhci_hcd *xhci,
                        ep_state &= EP_STATE_MASK;
                        slot_state = le32_to_cpu(slot_ctx->dev_state);
                        slot_state = GET_SLOT_STATE(slot_state);
-                       xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
+                       xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                                       "Slot state = %u, EP state = %u",
                                        slot_state, ep_state);
                        break;
                case COMP_EBADSLT:
@@ -1113,7 +1130,8 @@ static void handle_set_deq_completion(struct xhci_hcd *xhci,
                 * cancelling URBs, which might not be an error...
                 */
        } else {
-               xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                       "Successful Set TR Deq Ptr cmd, deq = @%08llx",
                         le64_to_cpu(ep_ctx->deq));
                if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg,
                                         dev->eps[ep_index].queued_deq_ptr) ==

diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
index d6c2229..c0eaccc 100644 (file)
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -52,6 +52,11 @@ DEFINE_EVENT(xhci_log_msg, xhci_dbg_reset_ep,
        TP_ARGS(vaf)
 );
 
+DEFINE_EVENT(xhci_log_msg, xhci_dbg_cancel_urb,
+       TP_PROTO(struct va_format *vaf),
+       TP_ARGS(vaf)
+);
+
 DECLARE_EVENT_CLASS(xhci_log_ctx,
        TP_PROTO(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx,
                 unsigned int ep_num),

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 9f4f73b..4adf5e1 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1434,7 +1434,8 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                goto done;
        temp = xhci_readl(xhci, &xhci->op_regs->status);
        if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) {
-               xhci_dbg(xhci, "HW died, freeing TD.\n");
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "HW died, freeing TD.");
                urb_priv = urb->hcpriv;
                for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
                        td = urb_priv->td[i];
@@ -1452,8 +1453,9 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
        }
        if ((xhci->xhc_state & XHCI_STATE_DYING) ||
                        (xhci->xhc_state & XHCI_STATE_HALTED)) {
-               xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
-                               "non-responsive xHCI host.\n",
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "Ep 0x%x: URB %p to be canceled on "
+                               "non-responsive xHCI host.",
                                urb->ep->desc.bEndpointAddress, urb);
                /* Let the stop endpoint command watchdog timer (which set this
                 * state) finish cleaning up the endpoint TD lists.  We must
@@ -1474,8 +1476,9 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
        urb_priv = urb->hcpriv;
        i = urb_priv->td_cnt;
        if (i < urb_priv->length)
-               xhci_dbg(xhci, "Cancel URB %p, dev %s, ep 0x%x, "
-                               "starting at offset 0x%llx\n",
+               xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
+                               "Cancel URB %p, dev %s, ep 0x%x, "
+                               "starting at offset 0x%llx",
                                urb, urb->dev->devpath,
                                urb->ep->desc.bEndpointAddress,
                                (unsigned long long) xhci_trb_virt_to_dma(