Beispiel #1
0
int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
{
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	unsigned long flags;
	int ret = 0;
	unsigned int slot_id, ep_index;


	if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
		return -EINVAL;

	slot_id = urb->dev->slot_id;
	ep_index = xhci_get_endpoint_index(&urb->ep->desc);

	if (!xhci->devs || !xhci->devs[slot_id]) {
		if (!in_interrupt())
			dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
		ret = -EINVAL;
		goto exit;
	}
	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
		if (!in_interrupt())
			xhci_dbg(xhci, "urb submitted during PCI suspend\n");
		ret = -ESHUTDOWN;
		goto exit;
	}
	if (usb_endpoint_xfer_control(&urb->ep->desc)) {
		
		if (urb->dev->speed == USB_SPEED_FULL) {
			ret = xhci_check_maxpacket(xhci, slot_id,
					ep_index, urb);
			if (ret < 0)
				return ret;
		}

		
		spin_lock_irqsave(&xhci->lock, flags);
		ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
		spin_lock_irqsave(&xhci->lock, flags);
		ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
		spin_lock_irqsave(&xhci->lock, flags);
		ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else {
		ret = -EINVAL;
	}
exit:
	return ret;
}
Beispiel #2
0
/* Drop an endpoint from a new bandwidth configuration for this device.
 * Only one call to this function is allowed per endpoint before
 * check_bandwidth() or reset_bandwidth() must be called.
 * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
 * add the endpoint to the schedule with possibly new parameters denoted by a
 * different endpoint descriptor in usb_host_endpoint.
 * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
 * not allowed.
 *
 * The USB core will not allow URBs to be queued to an endpoint that is being
 * disabled, so there's no need for mutual exclusion to protect
 * the xhci->devs[slot_id] structure.
 */
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint *ep)
{
	struct xhci_hcd *xhci;
	struct xhci_container_ctx *in_ctx, *out_ctx;
	struct xhci_input_control_ctx *ctrl_ctx;
	unsigned int ep_index;
	struct xhci_ep_ctx *ep_ctx;
	u32 drop_flag;
	u32 new_add_flags, new_drop_flags;
	int ret;

	ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
	if (ret <= 0)
		return ret;
	xhci = hcd_to_xhci(hcd);
	if (xhci->xhc_state & XHCI_STATE_DYING)
		return -ENODEV;

	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
	drop_flag = xhci_get_endpoint_flag(&ep->desc);
	if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
		xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
				__func__, drop_flag);
		return 0;
	}

	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
	ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
	if (!ctrl_ctx) {
		xhci_warn(xhci, "%s: Could not get input context, bad type.\n",
				__func__);
		return 0;
	}

	ep_index = xhci_get_endpoint_index(&ep->desc);
	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
	/* If the HC already knows the endpoint is disabled,
	 * or the HCD has noted it is disabled, ignore this request
	 */
	if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
	     cpu_to_le32(EP_STATE_DISABLED)) ||
	    le32_to_cpu(ctrl_ctx->drop_flags) &
	    xhci_get_endpoint_flag(&ep->desc)) {
		/* Do not warn when called after a usb_device_reset */
		if (xhci->devs[udev->slot_id]->eps[ep_index].ring != NULL)
			xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
				  __func__, ep);
		return 0;
	}

	ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
	new_drop_flags = le32_t
Beispiel #3
0
int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
	unsigned long flags;
	int ret;
	u32 temp;
	struct xhci_hcd *xhci;
	struct xhci_td *td;
	unsigned int ep_index;
	struct xhci_ring *ep_ring;
	struct xhci_virt_ep *ep;

	xhci = hcd_to_xhci(hcd);
	spin_lock_irqsave(&xhci->lock, flags);
	
	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
	if (ret || !urb->hcpriv)
		goto done;
	temp = xhci_readl(xhci, &xhci->op_regs->status);
	if (temp == 0xffffffff) {
		xhci_dbg(xhci, "HW died, freeing TD.\n");
		td = (struct xhci_td *) urb->hcpriv;

		usb_hcd_unlink_urb_from_ep(hcd, urb);
		spin_unlock_irqrestore(&xhci->lock, flags);
		usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, -ESHUTDOWN);
		kfree(td);
		return ret;
	}

	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 = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
	ep_ring = ep->ring;
	xhci_dbg(xhci, "Endpoint ring:\n");
	xhci_debug_ring(xhci, ep_ring);
	td = (struct xhci_td *) urb->hcpriv;

	ep->cancels_pending++;
	list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
	
	if (ep->cancels_pending == 1) {
		xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
		xhci_ring_cmd_db(xhci);
	}
done:
	spin_unlock_irqrestore(&xhci->lock, flags);
	return ret;
}
Beispiel #4
0
void xhci_endpoint_reset(struct usb_hcd *hcd,
		struct usb_host_endpoint *ep)
{
	struct xhci_hcd *xhci;
	struct usb_device *udev;
	unsigned int ep_index;
	unsigned long flags;
	int ret;
	struct xhci_virt_ep *virt_ep;

	xhci = hcd_to_xhci(hcd);
	udev = (struct usb_device *) ep->hcpriv;
	
	if (!ep->hcpriv)
		return;
	ep_index = xhci_get_endpoint_index(&ep->desc);
	virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
	if (!virt_ep->stopped_td) {
		xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
				ep->desc.bEndpointAddress);
		return;
	}
	if (usb_endpoint_xfer_control(&ep->desc)) {
		xhci_dbg(xhci, "Control endpoint stall already handled.\n");
		return;
	}

	xhci_dbg(xhci, "Queueing reset endpoint command\n");
	spin_lock_irqsave(&xhci->lock, flags);
	ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
	
	if (!ret) {
		xhci_cleanup_stalled_ring(xhci, udev, ep_index);
		kfree(virt_ep->stopped_td);
		xhci_ring_cmd_db(xhci);
	}
	spin_unlock_irqrestore(&xhci->lock, flags);

	if (ret)
		xhci_warn(xhci, "FIXME allocate a new ring segment\n");
}
Beispiel #5
0
/* Get the right ring for the given URB.
 * If the endpoint supports streams, boundary check the URB's stream ID.
 * If the endpoint doesn't support streams, return the singular endpoint ring.
 */
static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
		struct urb *urb)
{
	unsigned int slot_id;
	unsigned int ep_index;
	unsigned int stream_id;
	struct xhci_virt_ep *ep;

	slot_id = urb->dev->slot_id;
	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
	stream_id = urb->stream_id;
	ep = &xhci->devs[slot_id]->eps[ep_index];
	/* Common case: no streams */
	if (!(ep->ep_state & EP_HAS_STREAMS))
		return ep->ring;

	if (stream_id == 0) {
		xhci_warn(xhci,
				"WARN: Slot ID %u, ep index %u has streams, "
				"but URB has no stream ID.\n",
				slot_id, ep_index);
		return NULL;
	}

	if (stream_id < ep->stream_info->num_streams)
		return ep->stream_info->stream_rings[stream_id];

	xhci_warn(xhci,
			"WARN: Slot ID %u, ep index %u has "
			"stream IDs 1 to %u allocated, "
			"but stream ID %u is requested.\n",
			slot_id, ep_index,
			ep->stream_info->num_streams - 1,
			stream_id);
	return NULL;
}
Beispiel #6
0
/*
 * Remove the URB's TD from the endpoint ring.  This may cause the HC to stop
 * USB transfers, potentially stopping in the middle of a TRB buffer.  The HC
 * should pick up where it left off in the TD, unless a Set Transfer Ring
 * Dequeue Pointer is issued.
 *
 * The TRBs that make up the buffers for the canceled URB will be "removed" from
 * the ring.  Since the ring is a contiguous structure, they can't be physically
 * removed.  Instead, there are two options:
 *
 *  1) If the HC is in the middle of processing the URB to be canceled, we
 *     simply move the ring's dequeue pointer past those TRBs using the Set
 *     Transfer Ring Dequeue Pointer command.  This will be the common case,
 *     when drivers timeout on the last submitted URB and attempt to cancel.
 *
 *  2) If the HC is in the middle of a different TD, we turn the TRBs into a
 *     series of 1-TRB transfer no-op TDs.  (No-ops shouldn't be chained.)  The
 *     HC will need to invalidate the any TRBs it has cached after the stop
 *     endpoint command, as noted in the xHCI 0.95 errata.
 *
 *  3) The TD may have completed by the time the Stop Endpoint Command
 *     completes, so software needs to handle that case too.
 *
 * This function should protect against the TD enqueueing code ringing the
 * doorbell while this code is waiting for a Stop Endpoint command to complete.
 * It also needs to account for multiple cancellations on happening at the same
 * time for the same endpoint.
 *
 * Note that this function can be called in any context, or so says
 * usb_hcd_unlink_urb()
 */
int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
	unsigned long flags;
	int ret, i;
	u32 temp;
	struct xhci_hcd *xhci;
	struct urb_priv	*urb_priv;
	struct xhci_td *td;
	unsigned int ep_index;
	struct xhci_ring *ep_ring;
	struct xhci_virt_ep *ep;
	struct xhci_command *command;

	xhci = hcd_to_xhci(hcd);
	spin_lock_irqsave(&xhci->lock, flags);
	/* Make sure the URB hasn't completed or been unlinked already */
	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
	if (ret || !urb->hcpriv)
		goto done;
	temp = readl(&xhci->op_regs->status);
	if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) {
		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
				"HW died, freeing TD.");
		urb_priv = urb->hcpriv;
		for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
			td = urb_priv->td[i];
			if (!list_empty(&td->td_list))
				list_del_init(&td->td_list);
			if (!list_empty(&td->cancelled_td_list))
				list_del_init(&td->cancelled_td_list);
		}

		usb_hcd_unlink_urb_from_ep(hcd, urb);
		spin_unlock_irqrestore(&xhci->lock, flags);
		usb_hcd_giveback_urb(hcd, urb, -ESHUTDOWN);
		xhci_urb_free_priv(urb_priv);
		return ret;
	}
	if ((xhci->xhc_state & XHCI_STATE_DYING) ||
			(xhci->xhc_state & XHCI_STATE_HALTED)) {
		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
				"Ep 0x%x: URB %p to be canceled on "
				"non-responsive xHCI host.",
				urb->ep->desc.bEndpointAddress, urb);
		/* Let the stop endpoint command watchdog timer (which set this
		 * state) finish cleaning up the endpoint TD lists.  We must
		 * have caught it in the middle of dropping a lock and giving
		 * back an URB.
		 */
		goto done;
	}

	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
	ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
	ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
	if (!ep_ring) {
		ret = -EINVAL;
		goto done;
	}

	urb_priv = urb->hcpriv;
	i = urb_priv->td_cnt;
	if (i < urb_priv->length)
		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
				"Cancel URB %p, dev %s, ep 0x%x, "
				"starting at offset 0x%llx",
				urb, urb->dev->devpath,
				urb->ep->desc.bEndpointAddress,
				(unsigned long long) xhci_trb_virt_to_dma(
					urb_priv->td[i]->start_seg,
					urb_priv->td[i]->first_trb));

	for (; i < urb_priv->length; i++) {
		td = urb_priv->td[i];
		list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
	}

	/* Queue a stop endpoint command, but only if this is
	 * the first cancellation to be handled.
	 */
	if (!(ep->ep_state & EP_HALT_PENDING)) {
		command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC);
		if (!command) {
			ret = -ENOMEM;
			goto done;
		}
		ep->ep_state |= EP_HALT_PENDING;
		ep->stop_cmds_pending++;
		ep->stop_cmd_timer.expires = jiffies +
			XHCI_STOP_EP_CMD_TIMEOUT * HZ;
		add_timer(&ep->stop_cmd_timer);
		xhci_queue_stop_endpoint(xhci, command, urb->dev->slot_id,
					 ep_index, 0);
		xhci_ring_cmd_db(xhci);
	}
done:
	spin_unlock_irqrestore(&xhci->lock, flags);
	return ret;
}
Beispiel #7
0
/*
 * non-error returns are a promise to giveback() the urb later
 * we drop ownership so next owner (or urb unlink) can get it
 */
int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
{
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct xhci_td *buffer;
	unsigned long flags;
	int ret = 0;
	unsigned int slot_id, ep_index;
	struct urb_priv	*urb_priv;
	int size, i;

	if (!urb || xhci_check_args(hcd, urb->dev, urb->ep,
					true, true, __func__) <= 0)
		return -EINVAL;

	slot_id = urb->dev->slot_id;
	ep_index = xhci_get_endpoint_index(&urb->ep->desc);

	if (!HCD_HW_ACCESSIBLE(hcd)) {
		if (!in_interrupt())
			xhci_dbg(xhci, "urb submitted during PCI suspend\n");
		ret = -ESHUTDOWN;
		goto exit;
	}

	if (usb_endpoint_xfer_isoc(&urb->ep->desc))
		size = urb->number_of_packets;
	else
		size = 1;

	urb_priv = kzalloc(sizeof(struct urb_priv) +
				  size * sizeof(struct xhci_td *), mem_flags);
	if (!urb_priv)
		return -ENOMEM;

	buffer = kzalloc(size * sizeof(struct xhci_td), mem_flags);
	if (!buffer) {
		kfree(urb_priv);
		return -ENOMEM;
	}

	for (i = 0; i < size; i++) {
		urb_priv->td[i] = buffer;
		buffer++;
	}

	urb_priv->length = size;
	urb_priv->td_cnt = 0;
	urb->hcpriv = urb_priv;

	if (usb_endpoint_xfer_control(&urb->ep->desc)) {
		/* Check to see if the max packet size for the default control
		 * endpoint changed during FS device enumeration
		 */
		if (urb->dev->speed == USB_SPEED_FULL) {
			ret = xhci_check_maxpacket(xhci, slot_id,
					ep_index, urb);
			if (ret < 0) {
				xhci_urb_free_priv(urb_priv);
				urb->hcpriv = NULL;
				return ret;
			}
		}

		/* We have a spinlock and interrupts disabled, so we must pass
		 * atomic context to this function, which may allocate memory.
		 */
		spin_lock_irqsave(&xhci->lock, flags);
		if (xhci->xhc_state & XHCI_STATE_DYING)
			goto dying;
		ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		if (ret)
			goto free_priv;
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
		spin_lock_irqsave(&xhci->lock, flags);
		if (xhci->xhc_state & XHCI_STATE_DYING)
			goto dying;
		if (xhci->devs[slot_id]->eps[ep_index].ep_state &
				EP_GETTING_STREAMS) {
			xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
					"is transitioning to using streams.\n");
			ret = -EINVAL;
		} else if (xhci->devs[slot_id]->eps[ep_index].ep_state &
				EP_GETTING_NO_STREAMS) {
			xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
					"is transitioning to "
					"not having streams.\n");
			ret = -EINVAL;
		} else {
			ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
					slot_id, ep_index);
		}
		if (ret)
			goto free_priv;
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
		spin_lock_irqsave(&xhci->lock, flags);
		if (xhci->xhc_state & XHCI_STATE_DYING)
			goto dying;
		ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		if (ret)
			goto free_priv;
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else {
		spin_lock_irqsave(&xhci->lock, flags);
		if (xhci->xhc_state & XHCI_STATE_DYING)
			goto dying;
		ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb,
				slot_id, ep_index);
		if (ret)
			goto free_priv;
		spin_unlock_irqrestore(&xhci->lock, flags);
	}
exit:
	return ret;
dying:
	xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
			"non-responsive xHCI host.\n",
			urb->ep->desc.bEndpointAddress, urb);
	ret = -ESHUTDOWN;
free_priv:
	xhci_urb_free_priv(urb_priv);
	urb->hcpriv = NULL;
	spin_unlock_irqrestore(&xhci->lock, flags);
	return ret;
}
Beispiel #8
0
/* Find the flag for this endpoint (for use in the control context).  Use the
 * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
 * bit 1, etc.
 */
unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
{
	return 1 << (xhci_get_endpoint_index(desc) + 1);
}
Beispiel #9
0
int xhci_endpoint_init(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		struct usb_device *udev,
		struct usb_host_endpoint *ep,
		gfp_t mem_flags)
{
	unsigned int ep_index;
	struct xhci_ep_ctx *ep_ctx;
	struct xhci_ring *ep_ring;
	unsigned int max_packet;
	unsigned int max_burst;

	ep_index = xhci_get_endpoint_index(&ep->desc);
	ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);

	/* Set up the endpoint ring */
	virt_dev->eps[ep_index].new_ring =
		xhci_ring_alloc(xhci, 1, true, mem_flags);
	if (!virt_dev->eps[ep_index].new_ring) {
		/* Attempt to use the ring cache */
		if (virt_dev->num_rings_cached == 0)
			return -ENOMEM;
		virt_dev->eps[ep_index].new_ring =
			virt_dev->ring_cache[virt_dev->num_rings_cached];
		virt_dev->ring_cache[virt_dev->num_rings_cached] = NULL;
		virt_dev->num_rings_cached--;
		xhci_reinit_cached_ring(xhci, virt_dev->eps[ep_index].new_ring);
	}
	ep_ring = virt_dev->eps[ep_index].new_ring;
	ep_ctx->deq = ep_ring->first_seg->dma | ep_ring->cycle_state;

	ep_ctx->ep_info = xhci_get_endpoint_interval(udev, ep);

	/* FIXME dig Mult and streams info out of ep companion desc */

	/* Allow 3 retries for everything but isoc;
	 * error count = 0 means infinite retries.
	 */
	if (!usb_endpoint_xfer_isoc(&ep->desc))
		ep_ctx->ep_info2 = ERROR_COUNT(3);
	else
		ep_ctx->ep_info2 = ERROR_COUNT(1);

	ep_ctx->ep_info2 |= xhci_get_endpoint_type(udev, ep);

	/* Set the max packet size and max burst */
	switch (udev->speed) {
	case USB_SPEED_SUPER:
		max_packet = ep->desc.wMaxPacketSize;
		ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
		/* dig out max burst from ep companion desc */
		if (!ep->ss_ep_comp) {
			xhci_warn(xhci, "WARN no SS endpoint companion descriptor.\n");
			max_packet = 0;
		} else {
			max_packet = ep->ss_ep_comp->desc.bMaxBurst;
		}
		ep_ctx->ep_info2 |= MAX_BURST(max_packet);
		break;
	case USB_SPEED_HIGH:
		/* bits 11:12 specify the number of additional transaction
		 * opportunities per microframe (USB 2.0, section 9.6.6)
		 */
		if (usb_endpoint_xfer_isoc(&ep->desc) ||
				usb_endpoint_xfer_int(&ep->desc)) {
			max_burst = (ep->desc.wMaxPacketSize & 0x1800) >> 11;
			ep_ctx->ep_info2 |= MAX_BURST(max_burst);
		}
		/* Fall through */
	case USB_SPEED_FULL:
	case USB_SPEED_LOW:
		max_packet = ep->desc.wMaxPacketSize & 0x3ff;
		ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
		break;
	default:
		BUG();
	}
Beispiel #10
0
int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint *ep)
{
	struct xhci_hcd *xhci;
	struct xhci_container_ctx *in_ctx, *out_ctx;
	unsigned int ep_index;
	struct xhci_ep_ctx *ep_ctx;
	struct xhci_slot_ctx *slot_ctx;
	struct xhci_input_control_ctx *ctrl_ctx;
	u32 added_ctxs;
	unsigned int last_ctx;
	u32 new_add_flags, new_drop_flags, new_slot_info;
	int ret = 0;

	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
	if (ret <= 0) {
		
		ep->hcpriv = NULL;
		return ret;
	}
	xhci = hcd_to_xhci(hcd);

	added_ctxs = xhci_get_endpoint_flag(&ep->desc);
	last_ctx = xhci_last_valid_endpoint(added_ctxs);
	if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
		
		xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
				__func__, added_ctxs);
		return 0;
	}

	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
				__func__);
		return -EINVAL;
	}

	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
	ep_index = xhci_get_endpoint_index(&ep->desc);
	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
	
	if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
		xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
				__func__, ep);
		return 0;
	}

	
	if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
				udev, ep, GFP_KERNEL) < 0) {
		dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
				__func__, ep->desc.bEndpointAddress);
		return -ENOMEM;
	}

	ctrl_ctx->add_flags |= added_ctxs;
	new_add_flags = ctrl_ctx->add_flags;

	
	new_drop_flags = ctrl_ctx->drop_flags;

	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
	
	if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
		slot_ctx->dev_info &= ~LAST_CTX_MASK;
		slot_ctx->dev_info |= LAST_CTX(last_ctx);
	}
	new_slot_info = slot_ctx->dev_info;

	
	ep->hcpriv = udev;

	xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
			(unsigned int) ep->desc.bEndpointAddress,
			udev->slot_id,
			(unsigned int) new_drop_flags,
			(unsigned int) new_add_flags,
			(unsigned int) new_slot_info);
	return 0;
}
Beispiel #11
0
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint *ep)
{
	struct xhci_hcd *xhci;
	struct xhci_container_ctx *in_ctx, *out_ctx;
	struct xhci_input_control_ctx *ctrl_ctx;
	struct xhci_slot_ctx *slot_ctx;
	unsigned int last_ctx;
	unsigned int ep_index;
	struct xhci_ep_ctx *ep_ctx;
	u32 drop_flag;
	u32 new_add_flags, new_drop_flags, new_slot_info;
	int ret;

	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
	if (ret <= 0)
		return ret;
	xhci = hcd_to_xhci(hcd);
	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);

	drop_flag = xhci_get_endpoint_flag(&ep->desc);
	if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
		xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
				__func__, drop_flag);
		return 0;
	}

	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
				__func__);
		return -EINVAL;
	}

	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
	ep_index = xhci_get_endpoint_index(&ep->desc);
	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
	
	if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
			ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
		xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
				__func__, ep);
		return 0;
	}

	ctrl_ctx->drop_flags |= drop_flag;
	new_drop_flags = ctrl_ctx->drop_flags;

	ctrl_ctx->add_flags &= ~drop_flag;
	new_add_flags = ctrl_ctx->add_flags;

	last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
	
	if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
		slot_ctx->dev_info &= ~LAST_CTX_MASK;
		slot_ctx->dev_info |= LAST_CTX(last_ctx);
	}
	new_slot_info = slot_ctx->dev_info;

	xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);

	xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
			(unsigned int) ep->desc.bEndpointAddress,
			udev->slot_id,
			(unsigned int) new_drop_flags,
			(unsigned int) new_add_flags,
			(unsigned int) new_slot_info);
	return 0;
}