USB: xhci: Make debugging more verbose.

Add more debugging to the irq handler, slot context initialization, ring
operations, URB cancellation, and MMIO writes.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 72 insertions, 24 deletions

diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
index 2e8e5bf6b6ca..764995fd59ef 100644
--- a/drivers/usb/host/xhci-hcd.c
+++ b/drivers/usb/host/xhci-hcd.c
@@ -267,8 +267,10 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
 {
         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
         u32 temp, temp2;
+        union xhci_trb *trb;
 
         spin_lock(&xhci->lock);
+        trb = xhci->event_ring->dequeue;
         /* Check if the xHC generated the interrupt, or the irq is shared */
         temp = xhci_readl(xhci, &xhci->op_regs->status);
         temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
@@ -276,6 +278,15 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
                 spin_unlock(&xhci->lock);
                 return IRQ_NONE;
         }
+        xhci_dbg(xhci, "op reg status = %08x\n", temp);
+        xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
+        xhci_dbg(xhci, "Event ring dequeue ptr:\n");
+        xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
+                        (unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
+                        lower_32_bits(trb->link.segment_ptr),
+                        upper_32_bits(trb->link.segment_ptr),
+                        (unsigned int) trb->link.intr_target,
+                        (unsigned int) trb->link.control);
 
         if (temp & STS_FATAL) {
                 xhci_warn(xhci, "WARNING: Host System Error\n");
@@ -385,6 +396,20 @@ int xhci_run(struct usb_hcd *hcd)
         add_timer(&xhci->event_ring_timer);
 #endif
 
+        xhci_dbg(xhci, "Command ring memory map follows:\n");
+        xhci_debug_ring(xhci, xhci->cmd_ring);
+        xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
+        xhci_dbg_cmd_ptrs(xhci);
+
+        xhci_dbg(xhci, "ERST memory map follows:\n");
+        xhci_dbg_erst(xhci, &xhci->erst);
+        xhci_dbg(xhci, "Event ring:\n");
+        xhci_debug_ring(xhci, xhci->event_ring);
+        xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
+        temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
+        temp_64 &= ~ERST_PTR_MASK;
+        xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
+
         xhci_dbg(xhci, "// Set the interrupt modulation register\n");
         temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
         temp &= ~ER_IRQ_INTERVAL_MASK;
@@ -409,20 +434,6 @@ int xhci_run(struct usb_hcd *hcd)
         if (NUM_TEST_NOOPS > 0)
                 doorbell = xhci_setup_one_noop(xhci);
 
-        xhci_dbg(xhci, "Command ring memory map follows:\n");
-        xhci_debug_ring(xhci, xhci->cmd_ring);
-        xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
-        xhci_dbg_cmd_ptrs(xhci);
-
-        xhci_dbg(xhci, "ERST memory map follows:\n");
-        xhci_dbg_erst(xhci, &xhci->erst);
-        xhci_dbg(xhci, "Event ring:\n");
-        xhci_debug_ring(xhci, xhci->event_ring);
-        xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
-        temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
-        temp_64 &= ~ERST_PTR_MASK;
-        xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
-
         temp = xhci_readl(xhci, &xhci->op_regs->command);
         temp |= (CMD_RUN);
         xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
@@ -665,8 +676,12 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                 goto done;
 
         xhci_dbg(xhci, "Cancel URB %p\n", urb);
+        xhci_dbg(xhci, "Event ring:\n");
+        xhci_debug_ring(xhci, xhci->event_ring);
         ep_index = xhci_get_endpoint_index(&urb->ep->desc);
         ep_ring = xhci->devs[urb->dev->slot_id]->ep_rings[ep_index];
+        xhci_dbg(xhci, "Endpoint ring:\n");
+        xhci_debug_ring(xhci, ep_ring);
         td = (struct xhci_td *) urb->hcpriv;
 
         ep_ring->cancels_pending++;
@@ -1178,6 +1193,8 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
         if (!udev->config)
                 xhci_setup_addressable_virt_dev(xhci, udev);
         /* Otherwise, assume the core has the device configured how it wants */
+        xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
+        xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma, 2);
 
         spin_lock_irqsave(&xhci->lock, flags);
         ret = xhci_queue_address_device(xhci, virt_dev->in_ctx_dma,
@@ -1221,6 +1238,8 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
         default:
                 xhci_err(xhci, "ERROR: unexpected command completion "
                                 "code 0x%x.\n", virt_dev->cmd_status);
+                xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
+                xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma, 2);
                 ret = -EINVAL;
                 break;
         }
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index fe9541a89a3d..1fc0decfa0ac 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -135,6 +135,7 @@ static void next_trb(struct xhci_hcd *xhci,
 static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
 {
         union xhci_trb *next = ++(ring->dequeue);
+        unsigned long long addr;
 
         ring->deq_updates++;
         /* Update the dequeue pointer further if that was a link TRB or we're at
@@ -152,6 +153,13 @@ static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
                 ring->dequeue = ring->deq_seg->trbs;
                 next = ring->dequeue;
         }
+        addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
+        if (ring == xhci->event_ring)
+                xhci_dbg(xhci, "Event ring deq = 0x%llx (DMA)\n", addr);
+        else if (ring == xhci->cmd_ring)
+                xhci_dbg(xhci, "Command ring deq = 0x%llx (DMA)\n", addr);
+        else
+                xhci_dbg(xhci, "Ring deq = 0x%llx (DMA)\n", addr);
 }
 
 /*
@@ -171,6 +179,7 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
 {
         u32 chain;
         union xhci_trb *next;
+        unsigned long long addr;
 
         chain = ring->enqueue->generic.field[3] & TRB_CHAIN;
         next = ++(ring->enqueue);
@@ -204,6 +213,13 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
                 ring->enqueue = ring->enq_seg->trbs;
                 next = ring->enqueue;
         }
+        addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
+        if (ring == xhci->event_ring)
+                xhci_dbg(xhci, "Event ring enq = 0x%llx (DMA)\n", addr);
+        else if (ring == xhci->cmd_ring)
+                xhci_dbg(xhci, "Command ring enq = 0x%llx (DMA)\n", addr);
+        else
+                xhci_dbg(xhci, "Ring enq = 0x%llx (DMA)\n", addr);
 }
 
 /*
@@ -252,8 +268,7 @@ void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
          * there might be more events to service.
          */
         temp &= ~ERST_EHB;
-        if (!in_interrupt())
-                xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n");
+        xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n");
         xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp,
                         &xhci->ir_set->erst_dequeue);
 }
@@ -781,6 +796,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
         struct urb *urb = 0;
         int status = -EINPROGRESS;
 
+        xhci_dbg(xhci, "In %s\n", __func__);
         xdev = xhci->devs[TRB_TO_SLOT_ID(event->flags)];
         if (!xdev) {
                 xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
@@ -789,6 +805,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 
         /* Endpoint ID is 1 based, our index is zero based */
         ep_index = TRB_TO_EP_ID(event->flags) - 1;
+        xhci_dbg(xhci, "%s - ep index = %d\n", __func__, ep_index);
         ep_ring = xdev->ep_rings[ep_index];
         if (!ep_ring || (xdev->out_ctx->ep[ep_index].ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) {
                 xhci_err(xhci, "ERROR Transfer event pointed to disabled endpoint\n");
@@ -797,6 +814,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 
         event_dma = event->buffer;
         /* This TRB should be in the TD at the head of this ring's TD list */
+        xhci_dbg(xhci, "%s - checking for list empty\n", __func__);
         if (list_empty(&ep_ring->td_list)) {
                 xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n",
                                 TRB_TO_SLOT_ID(event->flags), ep_index);
@@ -806,11 +824,14 @@ static int handle_tx_event(struct xhci_hcd *xhci,
                 urb = NULL;
                 goto cleanup;
         }
+        xhci_dbg(xhci, "%s - getting list entry\n", __func__);
         td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
 
         /* Is this a TRB in the currently executing TD? */
+        xhci_dbg(xhci, "%s - looking for TD\n", __func__);
         event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
                         td->last_trb, event_dma);
+        xhci_dbg(xhci, "%s - found event_seg = %p\n", __func__, event_seg);
         if (!event_seg) {
                 /* HC is busted, give up! */
                 xhci_err(xhci, "ERROR Transfer event TRB DMA ptr not part of current TD\n");
@@ -1027,6 +1048,8 @@ cleanup:
         /* FIXME for multi-TD URBs (who have buffers bigger than 64MB) */
         if (urb) {
                 usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), urb);
+                xhci_dbg(xhci, "Giveback URB %p, len = %d, status = %d\n",
+                                urb, td->urb->actual_length, status);
                 spin_unlock(&xhci->lock);
                 usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, status);
                 spin_lock(&xhci->lock);
@@ -1044,6 +1067,7 @@ void xhci_handle_event(struct xhci_hcd *xhci)
         int update_ptrs = 1;
         int ret;
 
+        xhci_dbg(xhci, "In %s\n", __func__);
         if (!xhci->event_ring || !xhci->event_ring->dequeue) {
                 xhci->error_bitmask |= 1 << 1;
                 return;
@@ -1056,18 +1080,25 @@ void xhci_handle_event(struct xhci_hcd *xhci)
                 xhci->error_bitmask |= 1 << 2;
                 return;
         }
+        xhci_dbg(xhci, "%s - OS owns TRB\n", __func__);
 
         /* FIXME: Handle more event types. */
         switch ((event->event_cmd.flags & TRB_TYPE_BITMASK)) {
         case TRB_TYPE(TRB_COMPLETION):
+                xhci_dbg(xhci, "%s - calling handle_cmd_completion\n", __func__);
                 handle_cmd_completion(xhci, &event->event_cmd);
+                xhci_dbg(xhci, "%s - returned from handle_cmd_completion\n", __func__);
                 break;
         case TRB_TYPE(TRB_PORT_STATUS):
+                xhci_dbg(xhci, "%s - calling handle_port_status\n", __func__);
                 handle_port_status(xhci, event);
+                xhci_dbg(xhci, "%s - returned from handle_port_status\n", __func__);
                 update_ptrs = 0;
                 break;
         case TRB_TYPE(TRB_TRANSFER):
+                xhci_dbg(xhci, "%s - calling handle_tx_event\n", __func__);
                 ret = handle_tx_event(xhci, &event->trans_event);
+                xhci_dbg(xhci, "%s - returned from handle_tx_event\n", __func__);
                 if (ret < 0)
                         xhci->error_bitmask |= 1 << 9;
                 else
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 60770c89132b..074728e10225 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1065,10 +1065,9 @@ static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
 static inline void xhci_writel(struct xhci_hcd *xhci,
                 const unsigned int val, __u32 __iomem *regs)
 {
-        if (!in_interrupt())
-                xhci_dbg(xhci,
-                         "`MEM_WRITE_DWORD(3'b000, 32'h%p, 32'h%0x, 4'hf);\n",
-                         regs, val);
+        xhci_dbg(xhci,
+                        "`MEM_WRITE_DWORD(3'b000, 32'h%p, 32'h%0x, 4'hf);\n",
+                        regs, val);
         writel(val, regs);
 }
 
@@ -1096,10 +1095,9 @@ static inline void xhci_write_64(struct xhci_hcd *xhci,
         u32 val_lo = lower_32_bits(val);
         u32 val_hi = upper_32_bits(val);
 
-        if (!in_interrupt())
-                xhci_dbg(xhci,
-                         "`MEM_WRITE_DWORD(3'b000, 64'h%p, 64'h%0lx, 4'hf);\n",
-                         regs, (long unsigned int) val);
+        xhci_dbg(xhci,
+                        "`MEM_WRITE_DWORD(3'b000, 64'h%p, 64'h%0lx, 4'hf);\n",
+                        regs, (long unsigned int) val);
         writel(val_lo, ptr);
         writel(val_hi, ptr + 1);
 }