usb: xhci: add xhci_log_ring trace events

This patch creates a new event class called xhci_log_ring, and
defines the events used for tracing the change of all kinds of
rings used by an xhci host. An xHCI ring is basically a memory
block shared between software and hardware. By tracing changes
of rings, it makes the life easier for debugging hardware or
software problems.

This info can be used, later, to print, in a human readable way,
the life cycle of an xHCI ring using the trace-cmd tool and the
appropriate plugin.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-mem.c

@@ -288,6 +288,8 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
 	if (!ring)
 		return;
 
+	trace_xhci_ring_free(ring);
+
 	if (ring->first_seg) {
 		if (ring->type == TYPE_STREAM)
 			xhci_remove_stream_mapping(ring);
@@ -400,6 +402,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
 			cpu_to_le32(LINK_TOGGLE);
 	}
 	xhci_initialize_ring_info(ring, cycle_state);
+	trace_xhci_ring_alloc(ring);
 	return ring;
 
 fail:
@@ -504,6 +507,7 @@ int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
 	}
 
 	xhci_link_rings(xhci, ring, first, last, num_segs);
+	trace_xhci_ring_expansion(ring);
 	xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion,
 			"ring expansion succeed, now has %d segments",
 			ring->num_segs);

drivers/usb/host/xhci-ring.c

@@ -191,6 +191,9 @@ static 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);
+
 	return;
 }
 
@@ -259,6 +262,8 @@ 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);
 }
 
 /*

drivers/usb/host/xhci-trace.h

@@ -388,6 +388,71 @@ DEFINE_EVENT(xhci_log_slot_ctx, xhci_handle_cmd_set_deq,
 	TP_ARGS(ctx)
 );
 
+DECLARE_EVENT_CLASS(xhci_log_ring,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring),
+	TP_STRUCT__entry(
+		__field(u32, type)
+		__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)
+		__field(unsigned int, num_trbs_free)
+		__field(unsigned int, bounce_buf_len)
+	),
+	TP_fast_assign(
+		__entry->ring = 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->num_trbs_free = ring->num_trbs_free;
+		__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 free_trbs %d bounce %d cycle %d",
+			xhci_ring_type_string(__entry->type), __entry->ring,
+			&__entry->enq, &__entry->enq_seg,
+			&__entry->deq, &__entry->deq_seg,
+			__entry->num_segs,
+			__entry->stream_id,
+			__entry->num_trbs_free,
+			__entry->bounce_buf_len,
+			__entry->cycle_state
+		)
+);
+
+DEFINE_EVENT(xhci_log_ring, xhci_ring_alloc,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(xhci_log_ring, xhci_ring_free,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(xhci_log_ring, xhci_ring_expansion,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(xhci_log_ring, xhci_inc_enq,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring)
+);
+
+DEFINE_EVENT(xhci_log_ring, xhci_inc_deq,
+	TP_PROTO(struct xhci_ring *ring),
+	TP_ARGS(ring)
+);
 #endif /* __XHCI_TRACE_H */
 
 /* this part must be outside header guard */