[PATCH 06/33] xhci: Don't trace ring at every enqueue or dequeue increase

[Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>]

Don't trace ring pointers every time driver increases enqueue pointer
after queuing a TRB, or dequeue pointer after handling an event.

These xhci_inc_deq: and xhci_inc_enq: trace entries fill up the trace and
provides little useful info now that the TRB DMA address is printed with
the TRB itself.

Only trace ring during xhci_inc_enq() and xhci_inc_deq() in case we move
to a new ring segment.

Also don't show both segment and TRB addess in trace.
Segment is just TRB with 0xfff masked off.

Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
 drivers/usb/host/xhci-ring.c  | 16 +++++++++-------
 drivers/usb/host/xhci-trace.h | 10 +++-------
 2 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 3c19f58fcefd..f7f7b0a818f8 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -167,13 +167,16 @@ void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring)
 	if (ring->type == TYPE_EVENT) {
 		if (!last_trb_on_seg(ring->deq_seg, ring->dequeue)) {
 			ring->dequeue++;
-			goto out;
+			return;
 		}
 		if (last_trb_on_ring(ring, ring->deq_seg, ring->dequeue))
 			ring->cycle_state ^= 1;
 		ring->deq_seg = ring->deq_seg->next;
 		ring->dequeue = ring->deq_seg->trbs;
-		goto out;
+
+		trace_xhci_inc_deq(ring);
+
+		return;
 	}
 
 	/* All other rings have link trbs */
@@ -188,14 +191,13 @@ void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring)
 		ring->deq_seg = ring->deq_seg->next;
 		ring->dequeue = ring->deq_seg->trbs;
 
+		trace_xhci_inc_deq(ring);
+
 		if (link_trb_count++ > ring->num_segs) {
 			xhci_warn(xhci, "Ring is an endless link TRB loop\n");
 			break;
 		}
 	}
-out:
-	trace_xhci_inc_deq(ring);
-
 	return;
 }
 
@@ -264,13 +266,13 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
 		ring->enqueue = ring->enq_seg->trbs;
 		next = ring->enqueue;
 
+		trace_xhci_inc_enq(ring);
+
 		if (link_trb_count++ > ring->num_segs) {
 			xhci_warn(xhci, "%s: Ring link TRB loop\n", __func__);
 			break;
 		}
 	}
-
-	trace_xhci_inc_enq(ring);
 }
 
 /*
diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
index cc916e58a329..57b8cb5a8d19 100644
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -458,8 +458,6 @@ DECLARE_EVENT_CLASS(xhci_log_ring,
 		__field(void *, ring)
 		__field(dma_addr_t, enq)
 		__field(dma_addr_t, deq)
-		__field(dma_addr_t, enq_seg)
-		__field(dma_addr_t, deq_seg)
 		__field(unsigned int, num_segs)
 		__field(unsigned int, stream_id)
 		__field(unsigned int, cycle_state)
@@ -470,17 +468,15 @@ DECLARE_EVENT_CLASS(xhci_log_ring,
 		__entry->type = ring->type;
 		__entry->num_segs = ring->num_segs;
 		__entry->stream_id = ring->stream_id;
-		__entry->enq_seg = ring->enq_seg->dma;
-		__entry->deq_seg = ring->deq_seg->dma;
 		__entry->cycle_state = ring->cycle_state;
 		__entry->bounce_buf_len = ring->bounce_buf_len;
 		__entry->enq = xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
 		__entry->deq = xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
 	),
-	TP_printk("%s %p: enq %pad(%pad) deq %pad(%pad) segs %d stream %d bounce %d cycle %d",
+	TP_printk("%s %p: enq %pad deq %pad segs %d stream %d bounce %d cycle %d",
 			xhci_ring_type_string(__entry->type), __entry->ring,
-			&__entry->enq, &__entry->enq_seg,
-			&__entry->deq, &__entry->deq_seg,
+			&__entry->enq,
+			&__entry->deq,
 			__entry->num_segs,
 			__entry->stream_id,
 			__entry->bounce_buf_len,
-- 
2.25.1