1 files changed, 149 insertions, 60 deletions

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index 8a9869ef0db6..06a2edb9e86e 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -173,16 +173,18 @@ static void xhci_dbc_giveback(struct dbc_request *req, int status)
 	spin_lock(&dbc->lock);
 }
 
-static void xhci_dbc_flush_single_request(struct dbc_request *req)
+static void trb_to_noop(union xhci_trb *trb)
 {
-	union xhci_trb	*trb = req->trb;
-
 	trb->generic.field[0]	= 0;
 	trb->generic.field[1]	= 0;
 	trb->generic.field[2]	= 0;
 	trb->generic.field[3]	&= cpu_to_le32(TRB_CYCLE);
 	trb->generic.field[3]	|= cpu_to_le32(TRB_TYPE(TRB_TR_NOOP));
+}
 
+static void xhci_dbc_flush_single_request(struct dbc_request *req)
+{
+	trb_to_noop(req->trb);
 	xhci_dbc_giveback(req, -ESHUTDOWN);
 }
 
@@ -246,8 +248,9 @@ xhci_dbc_queue_trb(struct xhci_ring *ring, u32 field1,
 	trb->generic.field[2]	= cpu_to_le32(field3);
 	trb->generic.field[3]	= cpu_to_le32(field4);
 
-	trace_xhci_dbc_gadget_ep_queue(ring, &trb->generic);
-
+	trace_xhci_dbc_gadget_ep_queue(ring, &trb->generic,
+				       xhci_trb_virt_to_dma(ring->enq_seg,
+							    ring->enqueue));
 	ring->num_trbs_free--;
 	next = ++(ring->enqueue);
 	if (TRB_TYPE_LINK_LE32(next->link.control)) {
@@ -469,7 +472,7 @@ xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags)
 		trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK));
 	}
 	INIT_LIST_HEAD(&ring->td_list);
-	xhci_initialize_ring_info(ring, 1);
+	xhci_initialize_ring_info(ring);
 	return ring;
 dma_fail:
 	kfree(seg);
@@ -516,7 +519,7 @@ static int xhci_dbc_mem_init(struct xhci_dbc *dbc, gfp_t flags)
 		goto string_fail;
 
 	/* Setup ERST register: */
-	writel(dbc->erst.erst_size, &dbc->regs->ersts);
+	writel(dbc->erst.num_entries, &dbc->regs->ersts);
 
 	lo_hi_writeq(dbc->erst.erst_dma_addr, &dbc->regs->erstba);
 	deq = xhci_trb_virt_to_dma(dbc->ring_evt->deq_seg,
@@ -649,7 +652,10 @@ static void xhci_dbc_stop(struct xhci_dbc *dbc)
 	case DS_DISABLED:
 		return;
 	case DS_CONFIGURED:
-	case DS_STALLED:
+		spin_lock(&dbc->lock);
+		xhci_dbc_flush_requests(dbc);
+		spin_unlock(&dbc->lock);
+
 		if (dbc->driver->disconnect)
 			dbc->driver->disconnect(dbc);
 		break;
@@ -670,6 +676,23 @@ static void xhci_dbc_stop(struct xhci_dbc *dbc)
 }
 
 static void
+handle_ep_halt_changes(struct xhci_dbc *dbc, struct dbc_ep *dep, bool halted)
+{
+	if (halted) {
+		dev_info(dbc->dev, "DbC Endpoint halted\n");
+		dep->halted = 1;
+
+	} else if (dep->halted) {
+		dev_info(dbc->dev, "DbC Endpoint halt cleared\n");
+		dep->halted = 0;
+
+		if (!list_empty(&dep->list_pending))
+			writel(DBC_DOOR_BELL_TARGET(dep->direction),
+			       &dbc->regs->doorbell);
+	}
+}
+
+static void
 dbc_handle_port_status(struct xhci_dbc *dbc, union xhci_trb *event)
 {
 	u32			portsc;
@@ -697,6 +720,7 @@ static void dbc_handle_xfer_event(struct xhci_dbc *dbc, union xhci_trb *event)
 	struct xhci_ring	*ring;
 	int			ep_id;
 	int			status;
+	struct xhci_ep_ctx	*ep_ctx;
 	u32			comp_code;
 	size_t			remain_length;
 	struct dbc_request	*req = NULL, *r;
@@ -706,8 +730,30 @@ static void dbc_handle_xfer_event(struct xhci_dbc *dbc, union xhci_trb *event)
 	ep_id		= TRB_TO_EP_ID(le32_to_cpu(event->generic.field[3]));
 	dep		= (ep_id == EPID_OUT) ?
 				get_out_ep(dbc) : get_in_ep(dbc);
+	ep_ctx		= (ep_id == EPID_OUT) ?
+				dbc_bulkout_ctx(dbc) : dbc_bulkin_ctx(dbc);
 	ring		= dep->ring;
 
+	/* Match the pending request: */
+	list_for_each_entry(r, &dep->list_pending, list_pending) {
+		if (r->trb_dma == event->trans_event.buffer) {
+			req = r;
+			break;
+		}
+		if (r->status == -COMP_STALL_ERROR) {
+			dev_warn(dbc->dev, "Give back stale stalled req\n");
+			ring->num_trbs_free++;
+			xhci_dbc_giveback(r, 0);
+		}
+	}
+
+	if (!req) {
+		dev_warn(dbc->dev, "no matched request\n");
+		return;
+	}
+
+	trace_xhci_dbc_handle_transfer(ring, &req->trb->generic, req->trb_dma);
+
 	switch (comp_code) {
 	case COMP_SUCCESS:
 		remain_length = 0;
@@ -718,31 +764,49 @@ static void dbc_handle_xfer_event(struct xhci_dbc *dbc, union xhci_trb *event)
 	case COMP_TRB_ERROR:
 	case COMP_BABBLE_DETECTED_ERROR:
 	case COMP_USB_TRANSACTION_ERROR:
-	case COMP_STALL_ERROR:
 		dev_warn(dbc->dev, "tx error %d detected\n", comp_code);
 		status = -comp_code;
 		break;
+	case COMP_STALL_ERROR:
+		dev_warn(dbc->dev, "Stall error at bulk TRB %llx, remaining %zu, ep deq %llx\n",
+			 event->trans_event.buffer, remain_length, ep_ctx->deq);
+		status = 0;
+		dep->halted = 1;
+
+		/*
+		 * xHC DbC may trigger a STALL bulk xfer event when host sends a
+		 * ClearFeature(ENDPOINT_HALT) request even if there wasn't an
+		 * active bulk transfer.
+		 *
+		 * Don't give back this transfer request as hardware will later
+		 * start processing TRBs starting from this 'STALLED' TRB,
+		 * causing TRBs and requests to be out of sync.
+		 *
+		 * If STALL event shows some bytes were transferred then assume
+		 * it's an actual transfer issue and give back the request.
+		 * In this case mark the TRB as No-Op to avoid hw from using the
+		 * TRB again.
+		 */
+
+		if ((ep_ctx->deq & ~TRB_CYCLE) == event->trans_event.buffer) {
+			dev_dbg(dbc->dev, "Ep stopped on Stalled TRB\n");
+			if (remain_length == req->length) {
+				dev_dbg(dbc->dev, "Spurious stall event, keep req\n");
+				req->status = -COMP_STALL_ERROR;
+				req->actual = 0;
+				return;
+			}
+			dev_dbg(dbc->dev, "Give back stalled req, but turn TRB to No-op\n");
+			trb_to_noop(req->trb);
+		}
+		break;
+
 	default:
 		dev_err(dbc->dev, "unknown tx error %d\n", comp_code);
 		status = -comp_code;
 		break;
 	}
 
-	/* Match the pending request: */
-	list_for_each_entry(r, &dep->list_pending, list_pending) {
-		if (r->trb_dma == event->trans_event.buffer) {
-			req = r;
-			break;
-		}
-	}
-
-	if (!req) {
-		dev_warn(dbc->dev, "no matched request\n");
-		return;
-	}
-
-	trace_xhci_dbc_handle_transfer(ring, &req->trb->generic);
-
 	ring->num_trbs_free++;
 	req->actual = req->length - remain_length;
 	xhci_dbc_giveback(req, status);
@@ -762,8 +826,8 @@ static void inc_evt_deq(struct xhci_ring *ring)
 static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
 {
 	dma_addr_t		deq;
-	struct dbc_ep		*dep;
 	union xhci_trb		*evt;
+	enum evtreturn		ret = EVT_DONE;
 	u32			ctrl, portsc;
 	bool			update_erdp = false;
 
@@ -814,43 +878,17 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
 			return EVT_DISC;
 		}
 
-		/* Handle endpoint stall event: */
+		/* Check and handle changes in endpoint halt status */
 		ctrl = readl(&dbc->regs->control);
-		if ((ctrl & DBC_CTRL_HALT_IN_TR) ||
-		    (ctrl & DBC_CTRL_HALT_OUT_TR)) {
-			dev_info(dbc->dev, "DbC Endpoint stall\n");
-			dbc->state = DS_STALLED;
-
-			if (ctrl & DBC_CTRL_HALT_IN_TR) {
-				dep = get_in_ep(dbc);
-				xhci_dbc_flush_endpoint_requests(dep);
-			}
-
-			if (ctrl & DBC_CTRL_HALT_OUT_TR) {
-				dep = get_out_ep(dbc);
-				xhci_dbc_flush_endpoint_requests(dep);
-			}
-
-			return EVT_DONE;
-		}
+		handle_ep_halt_changes(dbc, get_in_ep(dbc), ctrl & DBC_CTRL_HALT_IN_TR);
+		handle_ep_halt_changes(dbc, get_out_ep(dbc), ctrl & DBC_CTRL_HALT_OUT_TR);
 
 		/* Clear DbC run change bit: */
 		if (ctrl & DBC_CTRL_DBC_RUN_CHANGE) {
 			writel(ctrl, &dbc->regs->control);
 			ctrl = readl(&dbc->regs->control);
 		}
-
 		break;
-	case DS_STALLED:
-		ctrl = readl(&dbc->regs->control);
-		if (!(ctrl & DBC_CTRL_HALT_IN_TR) &&
-		    !(ctrl & DBC_CTRL_HALT_OUT_TR) &&
-		    (ctrl & DBC_CTRL_DBC_RUN)) {
-			dbc->state = DS_CONFIGURED;
-			break;
-		}
-
-		return EVT_DONE;
 	default:
 		dev_err(dbc->dev, "Unknown DbC state %d\n", dbc->state);
 		break;
@@ -866,7 +904,9 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
 		 */
 		rmb();
 
-		trace_xhci_dbc_handle_event(dbc->ring_evt, &evt->generic);
+		trace_xhci_dbc_handle_event(dbc->ring_evt, &evt->generic,
+					    xhci_trb_virt_to_dma(dbc->ring_evt->deq_seg,
+								 dbc->ring_evt->dequeue));
 
 		switch (le32_to_cpu(evt->event_cmd.flags) & TRB_TYPE_BITMASK) {
 		case TRB_TYPE(TRB_PORT_STATUS):
@@ -874,6 +914,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
 			break;
 		case TRB_TYPE(TRB_TRANSFER):
 			dbc_handle_xfer_event(dbc, evt);
+			ret = EVT_XFER_DONE;
 			break;
 		default:
 			break;
@@ -892,7 +933,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
 		lo_hi_writeq(deq, &dbc->regs->erdp);
 	}
 
-	return EVT_DONE;
+	return ret;
 }
 
 static void xhci_dbc_handle_events(struct work_struct *work)
@@ -901,6 +942,7 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 	struct xhci_dbc		*dbc;
 	unsigned long		flags;
 	unsigned int		poll_interval;
+	unsigned long		busypoll_timelimit;
 
 	dbc = container_of(to_delayed_work(work), struct xhci_dbc, event_work);
 	poll_interval = dbc->poll_interval;
@@ -919,10 +961,20 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 			dbc->driver->disconnect(dbc);
 		break;
 	case EVT_DONE:
-		/* set fast poll rate if there are pending data transfers */
+		/*
+		 * Set fast poll rate if there are pending out transfers, or
+		 * a transfer was recently processed
+		 */
+		busypoll_timelimit = dbc->xfer_timestamp +
+			msecs_to_jiffies(DBC_XFER_INACTIVITY_TIMEOUT);
+
 		if (!list_empty(&dbc->eps[BULK_OUT].list_pending) ||
-		    !list_empty(&dbc->eps[BULK_IN].list_pending))
-			poll_interval = 1;
+		    time_is_after_jiffies(busypoll_timelimit))
+			poll_interval = 0;
+		break;
+	case EVT_XFER_DONE:
+		dbc->xfer_timestamp = jiffies;
+		poll_interval = 0;
 		break;
 	default:
 		dev_info(dbc->dev, "stop handling dbc events\n");
@@ -939,7 +991,6 @@ static const char * const dbc_state_strings[DS_MAX] = {
 	[DS_ENABLED] = "enabled",
 	[DS_CONNECTED] = "connected",
 	[DS_CONFIGURED] = "configured",
-	[DS_STALLED] = "stalled",
 };
 
 static ssize_t dbc_show(struct device *dev,
@@ -1150,11 +1201,48 @@ static ssize_t dbc_bInterfaceProtocol_store(struct device *dev,
 	return size;
 }
 
+static ssize_t dbc_poll_interval_ms_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct xhci_dbc *dbc;
+	struct xhci_hcd *xhci;
+
+	xhci = hcd_to_xhci(dev_get_drvdata(dev));
+	dbc = xhci->dbc;
+
+	return sysfs_emit(buf, "%u\n", dbc->poll_interval);
+}
+
+static ssize_t dbc_poll_interval_ms_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t size)
+{
+	struct xhci_dbc *dbc;
+	struct xhci_hcd *xhci;
+	u32 value;
+	int ret;
+
+	ret = kstrtou32(buf, 0, &value);
+	if (ret || value > DBC_POLL_INTERVAL_MAX)
+		return -EINVAL;
+
+	xhci = hcd_to_xhci(dev_get_drvdata(dev));
+	dbc = xhci->dbc;
+
+	dbc->poll_interval = value;
+
+	mod_delayed_work(system_wq, &dbc->event_work, 0);
+
+	return size;
+}
+
 static DEVICE_ATTR_RW(dbc);
 static DEVICE_ATTR_RW(dbc_idVendor);
 static DEVICE_ATTR_RW(dbc_idProduct);
 static DEVICE_ATTR_RW(dbc_bcdDevice);
 static DEVICE_ATTR_RW(dbc_bInterfaceProtocol);
+static DEVICE_ATTR_RW(dbc_poll_interval_ms);
 
 static struct attribute *dbc_dev_attrs[] = {
 	&dev_attr_dbc.attr,
@@ -1162,6 +1250,7 @@ static struct attribute *dbc_dev_attrs[] = {
 	&dev_attr_dbc_idProduct.attr,
 	&dev_attr_dbc_bcdDevice.attr,
 	&dev_attr_dbc_bInterfaceProtocol.attr,
+	&dev_attr_dbc_poll_interval_ms.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(dbc_dev);