Merge "usb: xhci: Add helper API to issue stop endpoint command"

drivers/usb/host/xhci-mem.c

@@ -1831,6 +1831,147 @@ void xhci_free_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
 	erst->entries = NULL;
 }
 
+static void xhci_handle_sec_intr_events(struct xhci_hcd *xhci, int intr_num)
+{
+	union xhci_trb *erdp_trb, *current_trb;
+	struct xhci_segment	*seg;
+	u64 erdp_reg;
+	u32 iman_reg;
+	dma_addr_t deq;
+	unsigned long segment_offset;
+
+	/* disable irq, ack pending interrupt and ack all pending events */
+
+	iman_reg =
+		readl_relaxed(&xhci->sec_ir_set[intr_num]->irq_pending);
+	iman_reg &= ~IMAN_IE;
+	writel_relaxed(iman_reg,
+			&xhci->sec_ir_set[intr_num]->irq_pending);
+	iman_reg =
+		readl_relaxed(&xhci->sec_ir_set[intr_num]->irq_pending);
+	if (iman_reg & IMAN_IP)
+		writel_relaxed(iman_reg,
+			&xhci->sec_ir_set[intr_num]->irq_pending);
+
+	/* last acked event trb is in erdp reg  */
+	erdp_reg =
+		xhci_read_64(xhci, &xhci->sec_ir_set[intr_num]->erst_dequeue);
+	deq = (dma_addr_t)(erdp_reg & ~ERST_PTR_MASK);
+	if (!deq) {
+		pr_debug("%s: event ring handling not required\n", __func__);
+		return;
+	}
+
+	seg = xhci->sec_event_ring[intr_num]->first_seg;
+	segment_offset = deq - seg->dma;
+
+	/* find out virtual address of the last acked event trb */
+	erdp_trb = current_trb = &seg->trbs[0] +
+				(segment_offset/sizeof(*current_trb));
+
+	/* read cycle state of the last acked trb to find out CCS */
+	xhci->sec_event_ring[intr_num]->cycle_state =
+		le32_to_cpu(current_trb->event_cmd.flags) & TRB_CYCLE;
+
+	while (1) {
+		/* last trb of the event ring: toggle cycle state */
+		if (current_trb == &seg->trbs[TRBS_PER_SEGMENT - 1]) {
+			xhci->sec_event_ring[intr_num]->cycle_state ^= 1;
+			current_trb = &seg->trbs[0];
+		} else {
+			current_trb++;
+		}
+
+		/* cycle state transition */
+		if ((le32_to_cpu(current_trb->event_cmd.flags) & TRB_CYCLE) !=
+		    xhci->sec_event_ring[intr_num]->cycle_state)
+			break;
+	}
+
+	if (erdp_trb != current_trb) {
+		deq =
+		xhci_trb_virt_to_dma(xhci->sec_event_ring[intr_num]->deq_seg,
+					current_trb);
+		if (deq == 0)
+			xhci_warn(xhci,
+				"WARN invalid SW event ring dequeue ptr.\n");
+		/* Update HC event ring dequeue pointer */
+		erdp_reg &= ERST_PTR_MASK;
+		erdp_reg |= ((u64) deq & (u64) ~ERST_PTR_MASK);
+	}
+
+	/* Clear the event handler busy flag (RW1C); event ring is empty. */
+	erdp_reg |= ERST_EHB;
+	xhci_write_64(xhci, erdp_reg,
+			&xhci->sec_ir_set[intr_num]->erst_dequeue);
+}
+
+static int sec_event_ring_cleanup(struct xhci_hcd *xhci, unsigned int intr_num)
+{
+	int size;
+	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
+
+	if (intr_num >= xhci->max_interrupters) {
+		xhci_err(xhci, "invalid secondary interrupter num %d\n",
+			intr_num);
+		return -EINVAL;
+	}
+
+	size =
+	sizeof(struct xhci_erst_entry)*(xhci->sec_erst[intr_num].num_entries);
+	if (xhci->sec_erst[intr_num].entries) {
+		xhci_handle_sec_intr_events(xhci, intr_num);
+		dma_free_coherent(dev, size, xhci->sec_erst[intr_num].entries,
+				xhci->sec_erst[intr_num].erst_dma_addr);
+		xhci->sec_erst[intr_num].entries = NULL;
+	}
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed SEC ERST#%d",
+		intr_num);
+	if (xhci->sec_event_ring[intr_num])
+		xhci_ring_free(xhci, xhci->sec_event_ring[intr_num]);
+
+	xhci->sec_event_ring[intr_num] = NULL;
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"Freed sec event ring");
+
+	return 0;
+}
+
+int xhci_sec_event_ring_cleanup(struct usb_device *udev, unsigned int intr_num)
+{
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+	if (udev->state == USB_STATE_NOTATTACHED || !HCD_RH_RUNNING(hcd))
+		return 0;
+
+	return sec_event_ring_cleanup(hcd_to_xhci(hcd), intr_num);
+}
+EXPORT_SYMBOL(xhci_sec_event_ring_cleanup);
+
+static void xhci_event_ring_cleanup(struct xhci_hcd *xhci)
+{
+	unsigned int i;
+
+	/* sec event ring clean up */
+	for (i = 1; i < xhci->max_interrupters; i++)
+		sec_event_ring_cleanup(xhci, i);
+
+	kfree(xhci->sec_ir_set);
+	xhci->sec_ir_set = NULL;
+	kfree(xhci->sec_erst);
+	xhci->sec_erst = NULL;
+	kfree(xhci->sec_event_ring);
+	xhci->sec_event_ring = NULL;
+
+	/* primary event ring clean up */
+	xhci_free_erst(xhci, &xhci->erst);
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed primary ERST");
+	if (xhci->event_ring)
+		xhci_ring_free(xhci, xhci->event_ring);
+	xhci->event_ring = NULL;
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed priamry event ring");
+}
+
 void xhci_mem_cleanup(struct xhci_hcd *xhci)
 {
 	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
@@ -1838,12 +1979,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
 
 	cancel_delayed_work_sync(&xhci->cmd_timer);
 
-	xhci_free_erst(xhci, &xhci->erst);
-
-	if (xhci->event_ring)
-		xhci_ring_free(xhci, xhci->event_ring);
-	xhci->event_ring = NULL;
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed event ring");
+	xhci_event_ring_cleanup(xhci);
 
 	if (xhci->lpm_command)
 		xhci_free_command(xhci, xhci->lpm_command);
@@ -2084,30 +2220,6 @@ static int xhci_check_trb_in_td_math(struct xhci_hcd *xhci)
 	return 0;
 }
 
-static void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
-{
-	u64 temp;
-	dma_addr_t deq;
-
-	deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
-			xhci->event_ring->dequeue);
-	if (deq == 0 && !in_interrupt())
-		xhci_warn(xhci, "WARN something wrong with SW event ring "
-				"dequeue ptr.\n");
-	/* Update HC event ring dequeue pointer */
-	temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
-	temp &= ERST_PTR_MASK;
-	/* Don't clear the EHB bit (which is RW1C) because
-	 * there might be more events to service.
-	 */
-	temp &= ~ERST_EHB;
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-			"// Write event ring dequeue pointer, "
-			"preserving EHB bit");
-	xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp,
-			&xhci->ir_set->erst_dequeue);
-}
-
 static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 		__le32 __iomem *addr, int max_caps)
 {
@@ -2344,6 +2456,159 @@ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
 	return 0;
 }
 
+static int xhci_event_ring_setup(struct xhci_hcd *xhci, struct xhci_ring **er,
+	struct xhci_intr_reg __iomem *ir_set, struct xhci_erst *erst,
+	unsigned int intr_num, gfp_t flags)
+{
+	dma_addr_t deq;
+	u64 val_64;
+	unsigned int val;
+	int ret;
+
+	*er = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT, 0, flags);
+	if (!*er)
+		return -ENOMEM;
+
+	ret = xhci_alloc_erst(xhci, *er, erst, flags);
+	if (ret)
+		return ret;
+
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"intr# %d: num segs = %i, virt addr = %pK, dma addr = 0x%llx",
+			intr_num,
+			erst->num_entries,
+			erst->entries,
+			(unsigned long long)erst->erst_dma_addr);
+
+	/* set ERST count with the number of entries in the segment table */
+	val = readl_relaxed(&ir_set->erst_size);
+	val &= ERST_SIZE_MASK;
+	val |= ERST_NUM_SEGS;
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"Write ERST size = %i to ir_set %d (some bits preserved)", val,
+		intr_num);
+	writel_relaxed(val, &ir_set->erst_size);
+
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+			"intr# %d: Set ERST entries to point to event ring.",
+			intr_num);
+	/* set the segment table base address */
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+			"Set ERST base address for ir_set %d = 0x%llx",
+			intr_num,
+			(unsigned long long)erst->erst_dma_addr);
+	val_64 = xhci_read_64(xhci, &ir_set->erst_base);
+	val_64 &= ERST_PTR_MASK;
+	val_64 |= (erst->erst_dma_addr & (u64) ~ERST_PTR_MASK);
+	xhci_write_64(xhci, val_64, &ir_set->erst_base);
+
+	/* Set the event ring dequeue address */
+	deq = xhci_trb_virt_to_dma((*er)->deq_seg, (*er)->dequeue);
+	if (deq == 0 && !in_interrupt())
+		xhci_warn(xhci,
+		"intr# %d:WARN something wrong with SW event ring deq ptr.\n",
+		intr_num);
+	/* Update HC event ring dequeue pointer */
+	val_64 = xhci_read_64(xhci, &ir_set->erst_dequeue);
+	val_64 &= ERST_PTR_MASK;
+	/* Don't clear the EHB bit (which is RW1C) because
+	 * there might be more events to service.
+	 */
+	val_64 &= ~ERST_EHB;
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"intr# %d:Write event ring dequeue pointer, preserving EHB bit",
+		intr_num);
+	xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | val_64,
+			&ir_set->erst_dequeue);
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+			"Wrote ERST address to ir_set %d.", intr_num);
+
+	return 0;
+}
+
+int xhci_sec_event_ring_setup(struct usb_device *udev, unsigned int intr_num)
+{
+	int ret;
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	if (udev->state == USB_STATE_NOTATTACHED || !HCD_RH_RUNNING(hcd))
+		return 0;
+
+	if ((xhci->xhc_state & XHCI_STATE_HALTED) || !xhci->sec_ir_set
+		|| !xhci->sec_event_ring || !xhci->sec_erst ||
+		intr_num >= xhci->max_interrupters) {
+		xhci_err(xhci,
+		"%s:state %x ir_set %pK evt_ring %pK erst %pK intr# %d\n",
+		__func__, xhci->xhc_state, xhci->sec_ir_set,
+		xhci->sec_event_ring, xhci->sec_erst, intr_num);
+		return -EINVAL;
+	}
+
+	if (xhci->sec_event_ring && xhci->sec_event_ring[intr_num]
+		&& xhci->sec_event_ring[intr_num]->first_seg)
+		goto done;
+
+	xhci->sec_ir_set[intr_num] = &xhci->run_regs->ir_set[intr_num];
+	ret = xhci_event_ring_setup(xhci,
+				&xhci->sec_event_ring[intr_num],
+				xhci->sec_ir_set[intr_num],
+				&xhci->sec_erst[intr_num],
+				intr_num, GFP_KERNEL);
+	if (ret) {
+		xhci_err(xhci, "sec event ring setup failed inter#%d\n",
+			intr_num);
+		return ret;
+	}
+done:
+	return 0;
+}
+EXPORT_SYMBOL(xhci_sec_event_ring_setup);
+
+static int xhci_event_ring_init(struct xhci_hcd *xhci, gfp_t flags)
+{
+	int ret = 0;
+
+	/* primary + secondary */
+	xhci->max_interrupters = HCS_MAX_INTRS(xhci->hcs_params1);
+
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"// Allocating primary event ring");
+
+	/* Set ir_set to interrupt register set 0 */
+	xhci->ir_set = &xhci->run_regs->ir_set[0];
+	ret = xhci_event_ring_setup(xhci, &xhci->event_ring, xhci->ir_set,
+		&xhci->erst, 0, flags);
+	if (ret) {
+		xhci_err(xhci, "failed to setup primary event ring\n");
+		goto fail;
+	}
+
+	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
+		"// Allocating sec event ring related pointers");
+
+	xhci->sec_ir_set = kcalloc(xhci->max_interrupters,
+				sizeof(*xhci->sec_ir_set), flags);
+	if (!xhci->sec_ir_set) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	xhci->sec_event_ring = kcalloc(xhci->max_interrupters,
+				sizeof(*xhci->sec_event_ring), flags);
+	if (!xhci->sec_event_ring) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	xhci->sec_erst = kcalloc(xhci->max_interrupters,
+				sizeof(*xhci->sec_erst), flags);
+	if (!xhci->sec_erst)
+		ret = -ENOMEM;
+fail:
+	return ret;
+}
+
 int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 {
 	dma_addr_t	dma;
@@ -2351,7 +2616,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	unsigned int	val, val2;
 	u64		val_64;
 	u32		page_size, temp;
-	int		i, ret;
+	int		i;
 
 	INIT_LIST_HEAD(&xhci->cmd_list);
 
@@ -2471,50 +2736,17 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 			"// Doorbell array is located at offset 0x%x"
 			" from cap regs base addr", val);
 	xhci->dba = (void __iomem *) xhci->cap_regs + val;
-	/* Set ir_set to interrupt register set 0 */
-	xhci->ir_set = &xhci->run_regs->ir_set[0];
 
 	/*
 	 * Event ring setup: Allocate a normal ring, but also setup
 	 * the event ring segment table (ERST).  Section 4.9.3.
 	 */
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring");
-	xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT,
-					0, flags);
-	if (!xhci->event_ring)
+	if (xhci_event_ring_init(xhci, GFP_KERNEL))
 		goto fail;
+
 	if (xhci_check_trb_in_td_math(xhci) < 0)
 		goto fail;
 
-	ret = xhci_alloc_erst(xhci, xhci->event_ring, &xhci->erst, flags);
-	if (ret)
-		goto fail;
-
-	/* set ERST count with the number of entries in the segment table */
-	val = readl(&xhci->ir_set->erst_size);
-	val &= ERST_SIZE_MASK;
-	val |= ERST_NUM_SEGS;
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-			"// Write ERST size = %i to ir_set 0 (some bits preserved)",
-			val);
-	writel(val, &xhci->ir_set->erst_size);
-
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-			"// Set ERST entries to point to event ring.");
-	/* set the segment table base address */
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-			"// Set ERST base address for ir_set 0 = 0x%llx",
-			(unsigned long long)xhci->erst.erst_dma_addr);
-	val_64 = xhci_read_64(xhci, &xhci->ir_set->erst_base);
-	val_64 &= ERST_PTR_MASK;
-	val_64 |= (xhci->erst.erst_dma_addr & (u64) ~ERST_PTR_MASK);
-	xhci_write_64(xhci, val_64, &xhci->ir_set->erst_base);
-
-	/* Set the event ring dequeue address */
-	xhci_set_hc_event_deq(xhci);
-	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
-			"Wrote ERST address to ir_set 0.");
-
 	/*
 	 * XXX: Might need to set the Interrupter Moderation Register to
 	 * something other than the default (~1ms minimum between interrupts).

drivers/usb/host/xhci.c

@@ -5300,6 +5300,146 @@ static void xhci_clear_tt_buffer_complete(struct usb_hcd *hcd,
 	spin_unlock_irqrestore(&xhci->lock, flags);
 }
 
+phys_addr_t xhci_get_sec_event_ring_phys_addr(struct usb_device *udev,
+	unsigned int intr_num, dma_addr_t *dma)
+{
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct device *dev = hcd->self.sysdev;
+	struct sg_table sgt;
+	phys_addr_t pa;
+
+	if (udev->state == USB_STATE_NOTATTACHED || !HCD_RH_RUNNING(hcd))
+		return 0;
+
+	if (intr_num >= xhci->max_interrupters) {
+		xhci_err(xhci, "intr num %d >= max intrs %d\n", intr_num,
+			xhci->max_interrupters);
+		return 0;
+	}
+
+	if (!(xhci->xhc_state & XHCI_STATE_HALTED) &&
+		xhci->sec_event_ring && xhci->sec_event_ring[intr_num]
+		&& xhci->sec_event_ring[intr_num]->first_seg) {
+
+		dma_get_sgtable(dev, &sgt,
+			xhci->sec_event_ring[intr_num]->first_seg->trbs,
+			xhci->sec_event_ring[intr_num]->first_seg->dma,
+			TRB_SEGMENT_SIZE);
+
+		*dma = xhci->sec_event_ring[intr_num]->first_seg->dma;
+
+		pa = page_to_phys(sg_page(sgt.sgl));
+		sg_free_table(&sgt);
+
+		return pa;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(xhci_get_sec_event_ring_phys_addr);
+
+phys_addr_t xhci_get_xfer_ring_phys_addr(struct usb_device *udev,
+		struct usb_host_endpoint *ep, dma_addr_t *dma)
+{
+	int ret;
+	unsigned int ep_index;
+	struct xhci_virt_device *virt_dev;
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+	struct device *dev = hcd->self.sysdev;
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct sg_table sgt;
+	phys_addr_t pa;
+
+	if (udev->state == USB_STATE_NOTATTACHED || !HCD_RH_RUNNING(hcd))
+		return 0;
+
+	ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
+	if (ret <= 0) {
+		xhci_err(xhci, "%s: invalid args\n", __func__);
+		return 0;
+	}
+
+	virt_dev = xhci->devs[udev->slot_id];
+	ep_index = xhci_get_endpoint_index(&ep->desc);
+
+	if (virt_dev->eps[ep_index].ring &&
+		virt_dev->eps[ep_index].ring->first_seg) {
+
+		dma_get_sgtable(dev, &sgt,
+			virt_dev->eps[ep_index].ring->first_seg->trbs,
+			virt_dev->eps[ep_index].ring->first_seg->dma,
+			TRB_SEGMENT_SIZE);
+
+		*dma = virt_dev->eps[ep_index].ring->first_seg->dma;
+
+		pa = page_to_phys(sg_page(sgt.sgl));
+		sg_free_table(&sgt);
+
+		return pa;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(xhci_get_xfer_ring_phys_addr);
+
+int xhci_stop_endpoint(struct usb_device *udev, struct usb_host_endpoint *ep)
+{
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	unsigned int ep_index;
+	struct xhci_virt_device *virt_dev;
+	struct xhci_command *cmd;
+	unsigned long flags;
+	int ret = 0;
+
+	if (udev->state == USB_STATE_NOTATTACHED || !HCD_RH_RUNNING(hcd))
+		return 0;
+
+	cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
+	if (!cmd)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&xhci->lock, flags);
+	virt_dev = xhci->devs[udev->slot_id];
+	if (!virt_dev) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	ep_index = xhci_get_endpoint_index(&ep->desc);
+	if (virt_dev->eps[ep_index].ring &&
+			virt_dev->eps[ep_index].ring->dequeue) {
+		ret = xhci_queue_stop_endpoint(xhci, cmd, udev->slot_id,
+				ep_index, 0);
+		if (ret)
+			goto err;
+
+		xhci_ring_cmd_db(xhci);
+		spin_unlock_irqrestore(&xhci->lock, flags);
+
+		/* Wait for stop endpoint command to finish */
+		wait_for_completion(cmd->completion);
+
+		if (cmd->status == COMP_COMMAND_ABORTED ||
+				cmd->status == COMP_STOPPED) {
+			xhci_warn(xhci,
+				"stop endpoint command timeout for ep%d%s\n",
+				usb_endpoint_num(&ep->desc),
+				usb_endpoint_dir_in(&ep->desc) ? "in" : "out");
+			ret = -ETIME;
+		}
+		goto free_cmd;
+	}
+
+err:
+	spin_unlock_irqrestore(&xhci->lock, flags);
+free_cmd:
+	xhci_free_command(xhci, cmd);
+	return ret;
+}
+EXPORT_SYMBOL(xhci_stop_endpoint);
+
 static const struct hc_driver xhci_hc_driver = {
 	.description =		"xhci-hcd",
 	.product_desc =		"xHCI Host Controller",

drivers/usb/host/xhci.h

@@ -16,6 +16,7 @@
 #include <linux/timer.h>
 #include <linux/kernel.h>
 #include <linux/usb/hcd.h>
+#include <linux/usb/xhci-sec.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 
 /* Code sharing between pci-quirks and xhci hcd */
@@ -1735,6 +1736,8 @@ struct xhci_hcd {
 	struct xhci_doorbell_array __iomem *dba;
 	/* Our HCD's current interrupter register set */
 	struct	xhci_intr_reg __iomem *ir_set;
+	/* secondary interrupter */
+	struct	xhci_intr_reg __iomem **sec_ir_set;
 
 	/* Cached register copies of read-only HC data */
 	__u32		hcs_params1;
@@ -1778,6 +1781,11 @@ struct xhci_hcd {
 	struct xhci_command	*current_cmd;
 	struct xhci_ring	*event_ring;
 	struct xhci_erst	erst;
+
+	/* secondary event ring and erst */
+	struct xhci_ring	**sec_event_ring;
+	struct xhci_erst	*sec_erst;
+
 	/* Scratchpad */
 	struct xhci_scratchpad  *scratchpad;
 	/* Store LPM test failed devices' information */

include/linux/usb/xhci-sec.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * xHCI secondary ring APIs
+ *
+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __LINUX_XHCI_SEC_H
+#define __LINUX_XHCI_SEC_H
+
+#include <linux/usb.h>
+
+#if IS_ENABLED(CONFIG_USB_XHCI_HCD)
+int xhci_sec_event_ring_setup(struct usb_device *udev, unsigned int intr_num);
+int xhci_sec_event_ring_cleanup(struct usb_device *udev, unsigned int intr_num);
+phys_addr_t xhci_get_sec_event_ring_phys_addr(struct usb_device *udev,
+		unsigned int intr_num, dma_addr_t *dma);
+phys_addr_t xhci_get_xfer_ring_phys_addr(struct usb_device *udev,
+		struct usb_host_endpoint *ep, dma_addr_t *dma);
+int xhci_stop_endpoint(struct usb_device *udev, struct usb_host_endpoint *ep);
+#else
+static inline int xhci_sec_event_ring_setup(struct usb_device *udev,
+		unsigned int intr_num);
+{
+	return -ENODEV;
+}
+
+static inline int xhci_sec_event_ring_cleanup(struct usb_device *udev,
+		unsigned int intr_num)
+{
+	return -ENODEV;
+}
+
+static inline phys_addr_t xhci_get_sec_event_ring_phys_addr(
+		struct usb_device *udev, unsigned int intr_num,
+		dma_addr_t *dma)
+{
+	return NULL;
+}
+
+static inline phys_addr_t xhci_get_xfer_ring_phys_addr(struct usb_device *udev,
+		struct usb_host_endpoint *ep, dma_addr_t *dma)
+{
+	return NULL;
+}
+
+static inline int xhci_stop_endpoint(struct usb_device *udev,
+		struct usb_host_endpoint *ep)
+{
+	return -ENODEV;
+}
+#endif
+
+#endif /* __LINUX_XHCI_SEC_H */