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path: root/drivers/usb/host/xhci-dbg.c
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Diffstat (limited to 'drivers/usb/host/xhci-dbg.c')
-rw-r--r--drivers/usb/host/xhci-dbg.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index 5724683cef16..6dbf7d856f80 100644
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -230,6 +230,64 @@ void xhci_print_registers(struct xhci_hcd *xhci)
xhci_print_op_regs(xhci);
}
+void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb)
+{
+ int i;
+ for (i = 0; i < 4; ++i)
+ xhci_dbg(xhci, "Offset 0x%x = 0x%x\n",
+ i*4, trb->generic.field[i]);
+}
+
+/**
+ * Debug a transfer request block (TRB).
+ */
+void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb)
+{
+ u64 address;
+ u32 type = xhci_readl(xhci, &trb->link.control) & TRB_TYPE_BITMASK;
+
+ switch (type) {
+ case TRB_TYPE(TRB_LINK):
+ xhci_dbg(xhci, "Link TRB:\n");
+ xhci_print_trb_offsets(xhci, trb);
+
+ address = trb->link.segment_ptr[0] +
+ (((u64) trb->link.segment_ptr[1]) << 32);
+ xhci_dbg(xhci, "Next ring segment DMA address = 0x%llx\n", address);
+
+ xhci_dbg(xhci, "Interrupter target = 0x%x\n",
+ GET_INTR_TARGET(trb->link.intr_target));
+ xhci_dbg(xhci, "Cycle bit = %u\n",
+ (unsigned int) (trb->link.control & TRB_CYCLE));
+ xhci_dbg(xhci, "Toggle cycle bit = %u\n",
+ (unsigned int) (trb->link.control & LINK_TOGGLE));
+ xhci_dbg(xhci, "No Snoop bit = %u\n",
+ (unsigned int) (trb->link.control & TRB_NO_SNOOP));
+ break;
+ case TRB_TYPE(TRB_TRANSFER):
+ address = trb->trans_event.buffer[0] +
+ (((u64) trb->trans_event.buffer[1]) << 32);
+ /*
+ * FIXME: look at flags to figure out if it's an address or if
+ * the data is directly in the buffer field.
+ */
+ xhci_dbg(xhci, "DMA address or buffer contents= %llu\n", address);
+ break;
+ case TRB_TYPE(TRB_COMPLETION):
+ address = trb->event_cmd.cmd_trb[0] +
+ (((u64) trb->event_cmd.cmd_trb[1]) << 32);
+ xhci_dbg(xhci, "Command TRB pointer = %llu\n", address);
+ xhci_dbg(xhci, "Completion status = %u\n",
+ (unsigned int) GET_COMP_CODE(trb->event_cmd.status));
+ xhci_dbg(xhci, "Flags = 0x%x\n", (unsigned int) trb->event_cmd.flags);
+ break;
+ default:
+ xhci_dbg(xhci, "Unknown TRB with TRB type ID %u\n",
+ (unsigned int) type>>10);
+ xhci_print_trb_offsets(xhci, trb);
+ break;
+ }
+}
/**
* Debug a segment with an xHCI ring.
@@ -261,6 +319,20 @@ void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg)
}
}
+void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring)
+{
+ xhci_dbg(xhci, "Ring deq = 0x%x (virt), 0x%x (dma)\n",
+ (unsigned int) ring->dequeue,
+ trb_virt_to_dma(ring->deq_seg, ring->dequeue));
+ xhci_dbg(xhci, "Ring deq updated %u times\n",
+ ring->deq_updates);
+ xhci_dbg(xhci, "Ring enq = 0x%x (virt), 0x%x (dma)\n",
+ (unsigned int) ring->enqueue,
+ trb_virt_to_dma(ring->enq_seg, ring->enqueue));
+ xhci_dbg(xhci, "Ring enq updated %u times\n",
+ ring->enq_updates);
+}
+
/**
* Debugging for an xHCI ring, which is a queue broken into multiple segments.
*
@@ -277,6 +349,10 @@ void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring)
struct xhci_segment *first_seg = ring->first_seg;
xhci_debug_segment(xhci, first_seg);
+ if (!ring->enq_updates && !ring->deq_updates) {
+ xhci_dbg(xhci, " Ring has not been updated\n");
+ return;
+ }
for (seg = first_seg->next; seg != first_seg; seg = seg->next)
xhci_debug_segment(xhci, seg);
}