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usb: xhci: add xhci_log_ring trace events

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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>
This commit is contained in:
Lu Baolu 2017-04-07 17:57:02 +03:00 committed by Greg Kroah-Hartman
parent d9f11ba9f1
commit b2d6edbb95
3 changed files with 74 additions and 0 deletions
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4
drivers/usb/host/xhci-mem.c
View File

@ -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);

5
drivers/usb/host/xhci-ring.c
View File

@ -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);
}
/*

65
drivers/usb/host/xhci-trace.h
View File

@ -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 */