summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/xhci-ring.c216
1 files changed, 115 insertions, 101 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index e28cfd15e1a..83580cf794d 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1459,6 +1459,117 @@ static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td,
}
/*
+ * Process bulk and interrupt tds, update urb status and actual_length.
+ */
+static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
+ union xhci_trb *event_trb, struct xhci_transfer_event *event,
+ struct xhci_virt_ep *ep, int *status)
+{
+ struct xhci_ring *ep_ring;
+ union xhci_trb *cur_trb;
+ struct xhci_segment *cur_seg;
+ u32 trb_comp_code;
+
+ ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
+ trb_comp_code = GET_COMP_CODE(event->transfer_len);
+
+ switch (trb_comp_code) {
+ case COMP_SUCCESS:
+ /* Double check that the HW transferred everything. */
+ if (event_trb != td->last_trb) {
+ xhci_warn(xhci, "WARN Successful completion "
+ "on short TX\n");
+ if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+ *status = -EREMOTEIO;
+ else
+ *status = 0;
+ } else {
+ if (usb_endpoint_xfer_bulk(&td->urb->ep->desc))
+ xhci_dbg(xhci, "Successful bulk "
+ "transfer!\n");
+ else
+ xhci_dbg(xhci, "Successful interrupt "
+ "transfer!\n");
+ *status = 0;
+ }
+ break;
+ case COMP_SHORT_TX:
+ if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+ *status = -EREMOTEIO;
+ else
+ *status = 0;
+ break;
+ default:
+ /* Others already handled above */
+ break;
+ }
+ dev_dbg(&td->urb->dev->dev,
+ "ep %#x - asked for %d bytes, "
+ "%d bytes untransferred\n",
+ td->urb->ep->desc.bEndpointAddress,
+ td->urb->transfer_buffer_length,
+ TRB_LEN(event->transfer_len));
+ /* Fast path - was this the last TRB in the TD for this URB? */
+ if (event_trb == td->last_trb) {
+ if (TRB_LEN(event->transfer_len) != 0) {
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length -
+ TRB_LEN(event->transfer_len);
+ if (td->urb->transfer_buffer_length <
+ td->urb->actual_length) {
+ xhci_warn(xhci, "HC gave bad length "
+ "of %d bytes left\n",
+ TRB_LEN(event->transfer_len));
+ td->urb->actual_length = 0;
+ if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+ *status = -EREMOTEIO;
+ else
+ *status = 0;
+ }
+ /* Don't overwrite a previously set error code */
+ if (*status == -EINPROGRESS) {
+ if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+ *status = -EREMOTEIO;
+ else
+ *status = 0;
+ }
+ } else {
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length;
+ /* Ignore a short packet completion if the
+ * untransferred length was zero.
+ */
+ if (*status == -EREMOTEIO)
+ *status = 0;
+ }
+ } else {
+ /* Slow path - walk the list, starting from the dequeue
+ * pointer, to get the actual length transferred.
+ */
+ td->urb->actual_length = 0;
+ for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
+ cur_trb != event_trb;
+ next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
+ if ((cur_trb->generic.field[3] &
+ TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
+ (cur_trb->generic.field[3] &
+ TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
+ td->urb->actual_length +=
+ TRB_LEN(cur_trb->generic.field[2]);
+ }
+ /* If the ring didn't stop on a Link or No-op TRB, add
+ * in the actual bytes transferred from the Normal TRB
+ */
+ if (trb_comp_code != COMP_STOP_INVAL)
+ td->urb->actual_length +=
+ TRB_LEN(cur_trb->generic.field[2]) -
+ TRB_LEN(event->transfer_len);
+ }
+
+ return finish_td(xhci, td, event_trb, event, ep, status, false);
+}
+
+/*
* If this function returns an error condition, it means it got a Transfer
* event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
* At this point, the host controller is probably hosed and should be reset.
@@ -1584,109 +1695,12 @@ static int handle_tx_event(struct xhci_hcd *xhci,
}
/* Now update the urb's actual_length and give back to the core */
/* Was this a control transfer? */
- if (usb_endpoint_xfer_control(&td->urb->ep->desc)) {
+ if (usb_endpoint_xfer_control(&td->urb->ep->desc))
ret = process_ctrl_td(xhci, td, event_trb, event, ep,
&status);
- goto cleanup;
- } else {
- switch (trb_comp_code) {
- case COMP_SUCCESS:
- /* Double check that the HW transferred everything. */
- if (event_trb != td->last_trb) {
- xhci_warn(xhci, "WARN Successful completion "
- "on short TX\n");
- if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
- status = -EREMOTEIO;
- else
- status = 0;
- } else {
- if (usb_endpoint_xfer_bulk(&td->urb->ep->desc))
- xhci_dbg(xhci, "Successful bulk "
- "transfer!\n");
- else
- xhci_dbg(xhci, "Successful interrupt "
- "transfer!\n");
- status = 0;
- }
- break;
- case COMP_SHORT_TX:
- if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
- status = -EREMOTEIO;
- else
- status = 0;
- break;
- default:
- /* Others already handled above */
- break;
- }
- dev_dbg(&td->urb->dev->dev,
- "ep %#x - asked for %d bytes, "
- "%d bytes untransferred\n",
- td->urb->ep->desc.bEndpointAddress,
- td->urb->transfer_buffer_length,
- TRB_LEN(event->transfer_len));
- /* Fast path - was this the last TRB in the TD for this URB? */
- if (event_trb == td->last_trb) {
- if (TRB_LEN(event->transfer_len) != 0) {
- td->urb->actual_length =
- td->urb->transfer_buffer_length -
- TRB_LEN(event->transfer_len);
- if (td->urb->transfer_buffer_length <
- td->urb->actual_length) {
- xhci_warn(xhci, "HC gave bad length "
- "of %d bytes left\n",
- TRB_LEN(event->transfer_len));
- td->urb->actual_length = 0;
- if (td->urb->transfer_flags &
- URB_SHORT_NOT_OK)
- status = -EREMOTEIO;
- else
- status = 0;
- }
- /* Don't overwrite a previously set error code */
- if (status == -EINPROGRESS) {
- if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
- status = -EREMOTEIO;
- else
- status = 0;
- }
- } else {
- td->urb->actual_length = td->urb->transfer_buffer_length;
- /* Ignore a short packet completion if the
- * untransferred length was zero.
- */
- if (status == -EREMOTEIO)
- status = 0;
- }
- } else {
- /* Slow path - walk the list, starting from the dequeue
- * pointer, to get the actual length transferred.
- */
- union xhci_trb *cur_trb;
- struct xhci_segment *cur_seg;
-
- td->urb->actual_length = 0;
- for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
- cur_trb != event_trb;
- next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
- if ((cur_trb->generic.field[3] &
- TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
- (cur_trb->generic.field[3] &
- TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
- td->urb->actual_length +=
- TRB_LEN(cur_trb->generic.field[2]);
- }
- /* If the ring didn't stop on a Link or No-op TRB, add
- * in the actual bytes transferred from the Normal TRB
- */
- if (trb_comp_code != COMP_STOP_INVAL)
- td->urb->actual_length +=
- TRB_LEN(cur_trb->generic.field[2]) -
- TRB_LEN(event->transfer_len);
- }
- }
-
- ret = finish_td(xhci, td, event_trb, event, ep, &status, false);
+ else
+ ret = process_bulk_intr_td(xhci, td, event_trb, event, ep,
+ &status);
cleanup:
inc_deq(xhci, xhci->event_ring, true);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-28 21:55:02 +0000