* endpoint rings; it generates events on the event ring for these.
*/
+#include <linux/scatterlist.h>
#include "xhci.h"
/*
* Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
* address of the TRB.
*/
-dma_addr_t trb_virt_to_dma(struct xhci_segment *seg,
+dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
union xhci_trb *trb)
{
- unsigned int offset;
+ unsigned long segment_offset;
- if (!seg || !trb || (void *) trb < (void *) seg->trbs)
+ if (!seg || !trb || trb < seg->trbs)
return 0;
- /* offset in bytes, since these are byte-addressable */
- offset = (unsigned int) trb - (unsigned int) seg->trbs;
- /* SEGMENT_SIZE in bytes, trbs are 16-byte aligned */
- if (offset > SEGMENT_SIZE || (offset % sizeof(*trb)) != 0)
+ /* offset in TRBs */
+ segment_offset = trb - seg->trbs;
+ if (segment_offset > TRBS_PER_SEGMENT)
return 0;
- return seg->dma + offset;
+ return seg->dma + (segment_offset * sizeof(*trb));
}
/* Does this link TRB point to the first segment in a ring,
return (trb->link.control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK);
}
+/* Updates trb to point to the next TRB in the ring, and updates seg if the next
+ * TRB is in a new segment. This does not skip over link TRBs, and it does not
+ * effect the ring dequeue or enqueue pointers.
+ */
+static void next_trb(struct xhci_hcd *xhci,
+ struct xhci_ring *ring,
+ struct xhci_segment **seg,
+ union xhci_trb **trb)
+{
+ if (last_trb(xhci, ring, *seg, *trb)) {
+ *seg = (*seg)->next;
+ *trb = ((*seg)->trbs);
+ } else {
+ *trb = (*trb)++;
+ }
+}
+
/*
* See Cycle bit rules. SW is the consumer for the event ring only.
* Don't make a ring full of link TRBs. That would be dumb and this would loop.
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
if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) {
ring->cycle_state = (ring->cycle_state ? 0 : 1);
if (!in_interrupt())
- xhci_dbg(xhci, "Toggle cycle state for ring 0x%x = %i\n",
- (unsigned int) ring,
+ xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
+ ring,
(unsigned int) ring->cycle_state);
}
ring->deq_seg = ring->deq_seg->next;
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);
}
/*
{
u32 chain;
union xhci_trb *next;
+ unsigned long long addr;
chain = ring->enqueue->generic.field[3] & TRB_CHAIN;
next = ++(ring->enqueue);
while (last_trb(xhci, ring, ring->enq_seg, next)) {
if (!consumer) {
if (ring != xhci->event_ring) {
+ next->link.control &= ~TRB_CHAIN;
+ next->link.control |= chain;
/* Give this link TRB to the hardware */
+ wmb();
if (next->link.control & TRB_CYCLE)
next->link.control &= (u32) ~TRB_CYCLE;
else
next->link.control |= (u32) TRB_CYCLE;
- next->link.control &= TRB_CHAIN;
- next->link.control |= chain;
}
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
ring->cycle_state = (ring->cycle_state ? 0 : 1);
if (!in_interrupt())
- xhci_dbg(xhci, "Toggle cycle state for ring 0x%x = %i\n",
- (unsigned int) ring,
+ xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
+ ring,
(unsigned int) ring->cycle_state);
}
}
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);
}
/*
return 1;
}
-void set_hc_event_deq(struct xhci_hcd *xhci)
+void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
{
- u32 temp;
+ u64 temp;
dma_addr_t deq;
- deq = trb_virt_to_dma(xhci->event_ring->deq_seg,
+ 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_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+ temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
temp &= ERST_PTR_MASK;
- if (!in_interrupt())
- xhci_dbg(xhci, "// Write event ring dequeue pointer\n");
- xhci_writel(xhci, 0, &xhci->ir_set->erst_dequeue[1]);
- xhci_writel(xhci, (deq & ~ERST_PTR_MASK) | temp,
- &xhci->ir_set->erst_dequeue[0]);
+ /* Don't clear the EHB bit (which is RW1C) because
+ * there might be more events to service.
+ */
+ temp &= ~ERST_EHB;
+ 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);
}
/* Ring the host controller doorbell after placing a command on the ring */
-void ring_cmd_db(struct xhci_hcd *xhci)
+void xhci_ring_cmd_db(struct xhci_hcd *xhci)
{
u32 temp;
xhci_readl(xhci, &xhci->dba->doorbell[0]);
}
+static void ring_ep_doorbell(struct xhci_hcd *xhci,
+ unsigned int slot_id,
+ unsigned int ep_index)
+{
+ struct xhci_ring *ep_ring;
+ u32 field;
+ __u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
+
+ ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+ /* Don't ring the doorbell for this endpoint if there are pending
+ * cancellations because the we don't want to interrupt processing.
+ */
+ if (!ep_ring->cancels_pending && !(ep_ring->state & SET_DEQ_PENDING)
+ && !(ep_ring->state & EP_HALTED)) {
+ field = xhci_readl(xhci, db_addr) & DB_MASK;
+ xhci_writel(xhci, field | EPI_TO_DB(ep_index), db_addr);
+ /* Flush PCI posted writes - FIXME Matthew Wilcox says this
+ * isn't time-critical and we shouldn't make the CPU wait for
+ * the flush.
+ */
+ xhci_readl(xhci, db_addr);
+ }
+}
+
+/*
+ * Find the segment that trb is in. Start searching in start_seg.
+ * If we must move past a segment that has a link TRB with a toggle cycle state
+ * bit set, then we will toggle the value pointed at by cycle_state.
+ */
+static struct xhci_segment *find_trb_seg(
+ struct xhci_segment *start_seg,
+ union xhci_trb *trb, int *cycle_state)
+{
+ struct xhci_segment *cur_seg = start_seg;
+ struct xhci_generic_trb *generic_trb;
+
+ while (cur_seg->trbs > trb ||
+ &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
+ generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
+ if (TRB_TYPE(generic_trb->field[3]) == TRB_LINK &&
+ (generic_trb->field[3] & LINK_TOGGLE))
+ *cycle_state = ~(*cycle_state) & 0x1;
+ cur_seg = cur_seg->next;
+ if (cur_seg == start_seg)
+ /* Looped over the entire list. Oops! */
+ return 0;
+ }
+ return cur_seg;
+}
+
+/*
+ * Move the xHC's endpoint ring dequeue pointer past cur_td.
+ * Record the new state of the xHC's endpoint ring dequeue segment,
+ * dequeue pointer, and new consumer cycle state in state.
+ * Update our internal representation of the ring's dequeue pointer.
+ *
+ * We do this in three jumps:
+ * - First we update our new ring state to be the same as when the xHC stopped.
+ * - Then we traverse the ring to find the segment that contains
+ * the last TRB in the TD. We toggle the xHC's new cycle state when we pass
+ * any link TRBs with the toggle cycle bit set.
+ * - Finally we move the dequeue state one TRB further, toggling the cycle bit
+ * if we've moved it past a link TRB with the toggle cycle bit set.
+ */
+void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
+ unsigned int slot_id, unsigned int ep_index,
+ struct xhci_td *cur_td, struct xhci_dequeue_state *state)
+{
+ struct xhci_virt_device *dev = xhci->devs[slot_id];
+ struct xhci_ring *ep_ring = dev->ep_rings[ep_index];
+ struct xhci_generic_trb *trb;
+ struct xhci_ep_ctx *ep_ctx;
+ dma_addr_t addr;
+
+ state->new_cycle_state = 0;
+ xhci_dbg(xhci, "Finding segment containing stopped TRB.\n");
+ state->new_deq_seg = find_trb_seg(cur_td->start_seg,
+ ep_ring->stopped_trb,
+ &state->new_cycle_state);
+ if (!state->new_deq_seg)
+ BUG();
+ /* Dig out the cycle state saved by the xHC during the stop ep cmd */
+ xhci_dbg(xhci, "Finding endpoint context\n");
+ ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
+ state->new_cycle_state = 0x1 & ep_ctx->deq;
+
+ state->new_deq_ptr = cur_td->last_trb;
+ xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n");
+ state->new_deq_seg = find_trb_seg(state->new_deq_seg,
+ state->new_deq_ptr,
+ &state->new_cycle_state);
+ if (!state->new_deq_seg)
+ BUG();
+
+ trb = &state->new_deq_ptr->generic;
+ if (TRB_TYPE(trb->field[3]) == TRB_LINK &&
+ (trb->field[3] & LINK_TOGGLE))
+ state->new_cycle_state = ~(state->new_cycle_state) & 0x1;
+ next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
+
+ /* Don't update the ring cycle state for the producer (us). */
+ xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
+ state->new_deq_seg);
+ addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
+ xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
+ (unsigned long long) addr);
+ xhci_dbg(xhci, "Setting dequeue pointer in internal ring state.\n");
+ ep_ring->dequeue = state->new_deq_ptr;
+ ep_ring->deq_seg = state->new_deq_seg;
+}
+
+static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
+ struct xhci_td *cur_td)
+{
+ struct xhci_segment *cur_seg;
+ union xhci_trb *cur_trb;
+
+ for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
+ true;
+ next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
+ if ((cur_trb->generic.field[3] & TRB_TYPE_BITMASK) ==
+ TRB_TYPE(TRB_LINK)) {
+ /* Unchain any chained Link TRBs, but
+ * leave the pointers intact.
+ */
+ cur_trb->generic.field[3] &= ~TRB_CHAIN;
+ xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
+ xhci_dbg(xhci, "Address = %p (0x%llx dma); "
+ "in seg %p (0x%llx dma)\n",
+ cur_trb,
+ (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
+ cur_seg,
+ (unsigned long long)cur_seg->dma);
+ } else {
+ cur_trb->generic.field[0] = 0;
+ cur_trb->generic.field[1] = 0;
+ cur_trb->generic.field[2] = 0;
+ /* Preserve only the cycle bit of this TRB */
+ cur_trb->generic.field[3] &= TRB_CYCLE;
+ cur_trb->generic.field[3] |= TRB_TYPE(TRB_TR_NOOP);
+ xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
+ "in seg %p (0x%llx dma)\n",
+ cur_trb,
+ (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
+ cur_seg,
+ (unsigned long long)cur_seg->dma);
+ }
+ if (cur_trb == cur_td->last_trb)
+ break;
+ }
+}
+
+static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
+ unsigned int ep_index, struct xhci_segment *deq_seg,
+ union xhci_trb *deq_ptr, u32 cycle_state);
+
+void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
+ struct xhci_ring *ep_ring, unsigned int slot_id,
+ unsigned int ep_index, struct xhci_dequeue_state *deq_state)
+{
+ xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
+ "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
+ deq_state->new_deq_seg,
+ (unsigned long long)deq_state->new_deq_seg->dma,
+ deq_state->new_deq_ptr,
+ (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr),
+ deq_state->new_cycle_state);
+ queue_set_tr_deq(xhci, slot_id, ep_index,
+ deq_state->new_deq_seg,
+ deq_state->new_deq_ptr,
+ (u32) deq_state->new_cycle_state);
+ /* Stop the TD queueing code from ringing the doorbell until
+ * this command completes. The HC won't set the dequeue pointer
+ * if the ring is running, and ringing the doorbell starts the
+ * ring running.
+ */
+ ep_ring->state |= SET_DEQ_PENDING;
+ xhci_ring_cmd_db(xhci);
+}
+
+/*
+ * When we get a command completion for a Stop Endpoint Command, we need to
+ * unlink any cancelled TDs from the ring. There are two ways to do that:
+ *
+ * 1. If the HW was in the middle of processing the TD that needs to be
+ * cancelled, then we must move the ring's dequeue pointer past the last TRB
+ * in the TD with a Set Dequeue Pointer Command.
+ * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain
+ * bit cleared) so that the HW will skip over them.
+ */
+static void handle_stopped_endpoint(struct xhci_hcd *xhci,
+ union xhci_trb *trb)
+{
+ unsigned int slot_id;
+ unsigned int ep_index;
+ struct xhci_ring *ep_ring;
+ struct list_head *entry;
+ struct xhci_td *cur_td = 0;
+ struct xhci_td *last_unlinked_td;
+
+ struct xhci_dequeue_state deq_state;
+#ifdef CONFIG_USB_HCD_STAT
+ ktime_t stop_time = ktime_get();
+#endif
+
+ memset(&deq_state, 0, sizeof(deq_state));
+ slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
+ ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
+ ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+
+ if (list_empty(&ep_ring->cancelled_td_list))
+ return;
+
+ /* Fix up the ep ring first, so HW stops executing cancelled TDs.
+ * We have the xHCI lock, so nothing can modify this list until we drop
+ * it. We're also in the event handler, so we can't get re-interrupted
+ * if another Stop Endpoint command completes
+ */
+ list_for_each(entry, &ep_ring->cancelled_td_list) {
+ cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
+ xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
+ cur_td->first_trb,
+ (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb));
+ /*
+ * If we stopped on the TD we need to cancel, then we have to
+ * move the xHC endpoint ring dequeue pointer past this TD.
+ */
+ if (cur_td == ep_ring->stopped_td)
+ xhci_find_new_dequeue_state(xhci, slot_id, ep_index, cur_td,
+ &deq_state);
+ else
+ td_to_noop(xhci, ep_ring, cur_td);
+ /*
+ * The event handler won't see a completion for this TD anymore,
+ * so remove it from the endpoint ring's TD list. Keep it in
+ * the cancelled TD list for URB completion later.
+ */
+ list_del(&cur_td->td_list);
+ ep_ring->cancels_pending--;
+ }
+ last_unlinked_td = cur_td;
+
+ /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
+ if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
+ xhci_queue_new_dequeue_state(xhci, ep_ring,
+ slot_id, ep_index, &deq_state);
+ } else {
+ /* Otherwise just ring the doorbell to restart the ring */
+ ring_ep_doorbell(xhci, slot_id, ep_index);
+ }
+
+ /*
+ * Drop the lock and complete the URBs in the cancelled TD list.
+ * New TDs to be cancelled might be added to the end of the list before
+ * we can complete all the URBs for the TDs we already unlinked.
+ * So stop when we've completed the URB for the last TD we unlinked.
+ */
+ do {
+ cur_td = list_entry(ep_ring->cancelled_td_list.next,
+ struct xhci_td, cancelled_td_list);
+ list_del(&cur_td->cancelled_td_list);
+
+ /* Clean up the cancelled URB */
+#ifdef CONFIG_USB_HCD_STAT
+ hcd_stat_update(xhci->tp_stat, cur_td->urb->actual_length,
+ ktime_sub(stop_time, cur_td->start_time));
+#endif
+ cur_td->urb->hcpriv = NULL;
+ usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), cur_td->urb);
+
+ xhci_dbg(xhci, "Giveback cancelled URB %p\n", cur_td->urb);
+ spin_unlock(&xhci->lock);
+ /* Doesn't matter what we pass for status, since the core will
+ * just overwrite it (because the URB has been unlinked).
+ */
+ usb_hcd_giveback_urb(xhci_to_hcd(xhci), cur_td->urb, 0);
+ kfree(cur_td);
+
+ spin_lock(&xhci->lock);
+ } while (cur_td != last_unlinked_td);
+
+ /* Return to the event handler with xhci->lock re-acquired */
+}
+
+/*
+ * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
+ * we need to clear the set deq pending flag in the endpoint ring state, so that
+ * the TD queueing code can ring the doorbell again. We also need to ring the
+ * endpoint doorbell to restart the ring, but only if there aren't more
+ * cancellations pending.
+ */
+static void handle_set_deq_completion(struct xhci_hcd *xhci,
+ struct xhci_event_cmd *event,
+ union xhci_trb *trb)
+{
+ unsigned int slot_id;
+ unsigned int ep_index;
+ struct xhci_ring *ep_ring;
+ struct xhci_virt_device *dev;
+ struct xhci_ep_ctx *ep_ctx;
+ struct xhci_slot_ctx *slot_ctx;
+
+ slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
+ ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
+ dev = xhci->devs[slot_id];
+ ep_ring = dev->ep_rings[ep_index];
+ ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
+ slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
+
+ if (GET_COMP_CODE(event->status) != COMP_SUCCESS) {
+ unsigned int ep_state;
+ unsigned int slot_state;
+
+ switch (GET_COMP_CODE(event->status)) {
+ case COMP_TRB_ERR:
+ xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because "
+ "of stream ID configuration\n");
+ break;
+ case COMP_CTX_STATE:
+ xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due "
+ "to incorrect slot or ep state.\n");
+ ep_state = ep_ctx->ep_info;
+ ep_state &= EP_STATE_MASK;
+ slot_state = slot_ctx->dev_state;
+ slot_state = GET_SLOT_STATE(slot_state);
+ xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
+ slot_state, ep_state);
+ break;
+ case COMP_EBADSLT:
+ xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because "
+ "slot %u was not enabled.\n", slot_id);
+ break;
+ default:
+ xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown "
+ "completion code of %u.\n",
+ GET_COMP_CODE(event->status));
+ break;
+ }
+ /* OK what do we do now? The endpoint state is hosed, and we
+ * should never get to this point if the synchronization between
+ * queueing, and endpoint state are correct. This might happen
+ * if the device gets disconnected after we've finished
+ * cancelling URBs, which might not be an error...
+ */
+ } else {
+ xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
+ ep_ctx->deq);
+ }
+
+ ep_ring->state &= ~SET_DEQ_PENDING;
+ ring_ep_doorbell(xhci, slot_id, ep_index);
+}
+
+static void handle_reset_ep_completion(struct xhci_hcd *xhci,
+ struct xhci_event_cmd *event,
+ union xhci_trb *trb)
+{
+ int slot_id;
+ unsigned int ep_index;
+
+ slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
+ ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
+ /* This command will only fail if the endpoint wasn't halted,
+ * but we don't care.
+ */
+ xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
+ (unsigned int) GET_COMP_CODE(event->status));
+
+ /* Clear our internal halted state and restart the ring */
+ xhci->devs[slot_id]->ep_rings[ep_index]->state &= ~EP_HALTED;
+ ring_ep_doorbell(xhci, slot_id, ep_index);
+}
+
static void handle_cmd_completion(struct xhci_hcd *xhci,
struct xhci_event_cmd *event)
{
u64 cmd_dma;
dma_addr_t cmd_dequeue_dma;
- cmd_dma = (((u64) event->cmd_trb[1]) << 32) + event->cmd_trb[0];
- cmd_dequeue_dma = trb_virt_to_dma(xhci->cmd_ring->deq_seg,
+ cmd_dma = event->cmd_trb;
+ cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
xhci->cmd_ring->dequeue);
/* Is the command ring deq ptr out of sync with the deq seg ptr? */
if (cmd_dequeue_dma == 0) {
if (xhci->devs[slot_id])
xhci_free_virt_device(xhci, slot_id);
break;
+ case TRB_TYPE(TRB_CONFIG_EP):
+ xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
+ complete(&xhci->devs[slot_id]->cmd_completion);
+ break;
case TRB_TYPE(TRB_ADDR_DEV):
xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
complete(&xhci->addr_dev);
break;
+ case TRB_TYPE(TRB_STOP_RING):
+ handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue);
+ break;
+ case TRB_TYPE(TRB_SET_DEQ):
+ handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
+ break;
case TRB_TYPE(TRB_CMD_NOOP):
++xhci->noops_handled;
break;
+ case TRB_TYPE(TRB_RESET_EP):
+ handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue);
+ break;
default:
/* Skip over unknown commands on the event ring */
xhci->error_bitmask |= 1 << 6;
/* Update event ring dequeue pointer before dropping the lock */
inc_deq(xhci, xhci->event_ring, true);
- set_hc_event_deq(xhci);
+ xhci_set_hc_event_deq(xhci);
spin_unlock(&xhci->lock);
/* Pass this up to the core */
dma_addr_t end_trb_dma;
struct xhci_segment *cur_seg;
- start_dma = trb_virt_to_dma(start_seg, start_trb);
+ start_dma = xhci_trb_virt_to_dma(start_seg, start_trb);
cur_seg = start_seg;
do {
- /*
- * Last TRB is a link TRB (unless we start inserting links in
- * the middle, FIXME if you do)
- */
- end_seg_dma = trb_virt_to_dma(cur_seg, &start_seg->trbs[TRBS_PER_SEGMENT - 2]);
+ /* We may get an event for a Link TRB in the middle of a TD */
+ end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
+ &start_seg->trbs[TRBS_PER_SEGMENT - 1]);
/* If the end TRB isn't in this segment, this is set to 0 */
- end_trb_dma = trb_virt_to_dma(cur_seg, end_trb);
+ end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
if (end_trb_dma > 0) {
/* The end TRB is in this segment, so suspect should be here */
return cur_seg;
}
cur_seg = cur_seg->next;
- start_dma = trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
+ start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
} while (1);
}
dma_addr_t event_dma;
struct xhci_segment *event_seg;
union xhci_trb *event_trb;
- struct urb *urb = NULL;
+ struct urb *urb = 0;
int status = -EINPROGRESS;
+ struct xhci_ep_ctx *ep_ctx;
+ 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");
/* 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) {
+ ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
+ if (!ep_ring || (ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) {
xhci_err(xhci, "ERROR Transfer event pointed to disabled endpoint\n");
return -ENODEV;
}
- event_dma = event->buffer[0];
- if (event->buffer[1] != 0)
- xhci_warn(xhci, "WARN ignoring upper 32-bits of 64-bit TRB dma address\n");
-
+ 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);
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");
return -ESHUTDOWN;
}
event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / sizeof(*event_trb)];
-
+ xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
+ (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10);
+ xhci_dbg(xhci, "Offset 0x00 (buffer lo) = 0x%x\n",
+ lower_32_bits(event->buffer));
+ xhci_dbg(xhci, "Offset 0x04 (buffer hi) = 0x%x\n",
+ upper_32_bits(event->buffer));
+ xhci_dbg(xhci, "Offset 0x08 (transfer length) = 0x%x\n",
+ (unsigned int) event->transfer_len);
+ xhci_dbg(xhci, "Offset 0x0C (flags) = 0x%x\n",
+ (unsigned int) event->flags);
+
+ /* Look for common error cases */
+ switch (GET_COMP_CODE(event->transfer_len)) {
+ /* Skip codes that require special handling depending on
+ * transfer type
+ */
+ case COMP_SUCCESS:
+ case COMP_SHORT_TX:
+ break;
+ case COMP_STOP:
+ xhci_dbg(xhci, "Stopped on Transfer TRB\n");
+ break;
+ case COMP_STOP_INVAL:
+ xhci_dbg(xhci, "Stopped on No-op or Link TRB\n");
+ break;
+ case COMP_STALL:
+ xhci_warn(xhci, "WARN: Stalled endpoint\n");
+ ep_ring->state |= EP_HALTED;
+ status = -EPIPE;
+ break;
+ case COMP_TRB_ERR:
+ xhci_warn(xhci, "WARN: TRB error on endpoint\n");
+ status = -EILSEQ;
+ break;
+ case COMP_TX_ERR:
+ xhci_warn(xhci, "WARN: transfer error on endpoint\n");
+ status = -EPROTO;
+ break;
+ case COMP_BABBLE:
+ xhci_warn(xhci, "WARN: babble error on endpoint\n");
+ status = -EOVERFLOW;
+ break;
+ case COMP_DB_ERR:
+ xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n");
+ status = -ENOSR;
+ break;
+ default:
+ xhci_warn(xhci, "ERROR Unknown event condition, HC probably busted\n");
+ urb = NULL;
+ goto cleanup;
+ }
/* 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)) {
xhci_warn(xhci, "WARN: short transfer on control ep\n");
status = -EREMOTEIO;
break;
- case COMP_STALL:
- xhci_warn(xhci, "WARN: Stalled control ep\n");
- status = -EPIPE;
- break;
- case COMP_TRB_ERR:
- xhci_warn(xhci, "WARN: TRB error on control ep\n");
- status = -EILSEQ;
- break;
- case COMP_TX_ERR:
- xhci_warn(xhci, "WARN: transfer error on control ep\n");
- status = -EPROTO;
- break;
- case COMP_DB_ERR:
- xhci_warn(xhci, "WARN: HC couldn't access mem fast enough on control TX\n");
- status = -ENOSR;
- break;
default:
- xhci_dbg(xhci, "ERROR Unknown event condition, HC probably busted\n");
- goto cleanup;
+ /* Others already handled above */
+ break;
}
/*
* Did we transfer any data, despite the errors that might have
if (event_trb != ep_ring->dequeue) {
/* The event was for the status stage */
if (event_trb == td->last_trb) {
- td->urb->actual_length = td->urb->transfer_buffer_length;
+ if (td->urb->actual_length != 0) {
+ /* Don't overwrite a previously set error code */
+ if (status == -EINPROGRESS || status == 0)
+ /* Did we already see a short data stage? */
+ status = -EREMOTEIO;
+ } else {
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length;
+ }
} else {
- /* The event was for the data stage */
- td->urb->actual_length = td->urb->transfer_buffer_length -
+ /* Maybe the event was for the data stage? */
+ if (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL) {
+ /* We didn't stop on a link TRB in the middle */
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length -
+ TRB_LEN(event->transfer_len);
+ xhci_dbg(xhci, "Waiting for status stage event\n");
+ urb = NULL;
+ goto cleanup;
+ }
+ }
+ }
+ } else {
+ switch (GET_COMP_CODE(event->transfer_len)) {
+ 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 {
+ xhci_dbg(xhci, "Successful bulk 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->actual_length < 0) {
+ xhci_warn(xhci, "HC gave bad length "
+ "of %d bytes left\n",
+ TRB_LEN(event->transfer_len));
+ td->urb->actual_length = 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 (TRB_TYPE(cur_trb->generic.field[3]) != TRB_TR_NOOP &&
+ TRB_TYPE(cur_trb->generic.field[3]) != 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 (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL)
+ td->urb->actual_length +=
+ TRB_LEN(cur_trb->generic.field[2]) -
+ TRB_LEN(event->transfer_len);
}
- while (ep_ring->dequeue != td->last_trb)
+ }
+ if (GET_COMP_CODE(event->transfer_len) == COMP_STOP_INVAL ||
+ GET_COMP_CODE(event->transfer_len) == COMP_STOP) {
+ /* The Endpoint Stop Command completion will take care of any
+ * stopped TDs. A stopped TD may be restarted, so don't update
+ * the ring dequeue pointer or take this TD off any lists yet.
+ */
+ ep_ring->stopped_td = td;
+ ep_ring->stopped_trb = event_trb;
+ } else {
+ if (GET_COMP_CODE(event->transfer_len) == COMP_STALL) {
+ /* The transfer is completed from the driver's
+ * perspective, but we need to issue a set dequeue
+ * command for this stalled endpoint to move the dequeue
+ * pointer past the TD. We can't do that here because
+ * the halt condition must be cleared first.
+ */
+ ep_ring->stopped_td = td;
+ ep_ring->stopped_trb = event_trb;
+ } else {
+ /* Update ring dequeue pointer */
+ while (ep_ring->dequeue != td->last_trb)
+ inc_deq(xhci, ep_ring, false);
inc_deq(xhci, ep_ring, false);
- inc_deq(xhci, ep_ring, false);
+ }
/* Clean up the endpoint's TD list */
urb = td->urb;
list_del(&td->td_list);
- kfree(td);
- } else {
- xhci_dbg(xhci, "FIXME do something for non-control transfers\n");
+ /* Was this TD slated to be cancelled but completed anyway? */
+ if (!list_empty(&td->cancelled_td_list)) {
+ list_del(&td->cancelled_td_list);
+ ep_ring->cancels_pending--;
+ }
+ /* Leave the TD around for the reset endpoint function to use */
+ if (GET_COMP_CODE(event->transfer_len) != COMP_STALL) {
+ kfree(td);
+ }
+ urb->hcpriv = NULL;
}
cleanup:
inc_deq(xhci, xhci->event_ring, true);
- set_hc_event_deq(xhci);
+ xhci_set_hc_event_deq(xhci);
+ /* 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);
* This function handles all OS-owned events on the event ring. It may drop
* xhci->lock between event processing (e.g. to pass up port status changes).
*/
-void handle_event(struct xhci_hcd *xhci)
+void xhci_handle_event(struct xhci_hcd *xhci)
{
union xhci_trb *event;
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;
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
if (update_ptrs) {
/* Update SW and HC event ring dequeue pointer */
inc_deq(xhci, xhci->event_ring, true);
- set_hc_event_deq(xhci);
+ xhci_set_hc_event_deq(xhci);
}
/* Are there more items on the event ring? */
- handle_event(xhci);
+ xhci_handle_event(xhci);
}
/**** Endpoint Ring Operations ****/
*/
xhci_warn(xhci, "WARN urb submitted to disabled ep\n");
return -ENOENT;
- case EP_STATE_HALTED:
case EP_STATE_ERROR:
- xhci_warn(xhci, "WARN waiting for halt or error on ep "
- "to be cleared\n");
+ xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n");
/* FIXME event handling code for error needs to clear it */
/* XXX not sure if this should be -ENOENT or not */
return -EINVAL;
+ case EP_STATE_HALTED:
+ xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n");
case EP_STATE_STOPPED:
case EP_STATE_RUNNING:
break;
return 0;
}
-int xhci_prepare_transfer(struct xhci_hcd *xhci,
+static int prepare_transfer(struct xhci_hcd *xhci,
struct xhci_virt_device *xdev,
unsigned int ep_index,
unsigned int num_trbs,
gfp_t mem_flags)
{
int ret;
-
+ struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
ret = prepare_ring(xhci, xdev->ep_rings[ep_index],
- xdev->out_ctx->ep[ep_index].ep_info & EP_STATE_MASK,
+ ep_ctx->ep_info & EP_STATE_MASK,
num_trbs, mem_flags);
if (ret)
return ret;
if (!*td)
return -ENOMEM;
INIT_LIST_HEAD(&(*td)->td_list);
+ INIT_LIST_HEAD(&(*td)->cancelled_td_list);
ret = usb_hcd_link_urb_to_ep(xhci_to_hcd(xhci), urb);
if (unlikely(ret)) {
urb->hcpriv = (void *) (*td);
/* Add this TD to the tail of the endpoint ring's TD list */
list_add_tail(&(*td)->td_list, &xdev->ep_rings[ep_index]->td_list);
+ (*td)->start_seg = xdev->ep_rings[ep_index]->enq_seg;
+ (*td)->first_trb = xdev->ep_rings[ep_index]->enqueue;
return 0;
}
+static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb)
+{
+ int num_sgs, num_trbs, running_total, temp, i;
+ struct scatterlist *sg;
+
+ sg = NULL;
+ num_sgs = urb->num_sgs;
+ temp = urb->transfer_buffer_length;
+
+ xhci_dbg(xhci, "count sg list trbs: \n");
+ num_trbs = 0;
+ for_each_sg(urb->sg->sg, sg, num_sgs, i) {
+ unsigned int previous_total_trbs = num_trbs;
+ unsigned int len = sg_dma_len(sg);
+
+ /* Scatter gather list entries may cross 64KB boundaries */
+ running_total = TRB_MAX_BUFF_SIZE -
+ (sg_dma_address(sg) & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+ if (running_total != 0)
+ num_trbs++;
+
+ /* How many more 64KB chunks to transfer, how many more TRBs? */
+ while (running_total < sg_dma_len(sg)) {
+ num_trbs++;
+ running_total += TRB_MAX_BUFF_SIZE;
+ }
+ xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n",
+ i, (unsigned long long)sg_dma_address(sg),
+ len, len, num_trbs - previous_total_trbs);
+
+ len = min_t(int, len, temp);
+ temp -= len;
+ if (temp == 0)
+ break;
+ }
+ xhci_dbg(xhci, "\n");
+ if (!in_interrupt())
+ dev_dbg(&urb->dev->dev, "ep %#x - urb len = %d, sglist used, num_trbs = %d\n",
+ urb->ep->desc.bEndpointAddress,
+ urb->transfer_buffer_length,
+ num_trbs);
+ return num_trbs;
+}
+
+static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
+{
+ if (num_trbs != 0)
+ dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated number of "
+ "TRBs, %d left\n", __func__,
+ urb->ep->desc.bEndpointAddress, num_trbs);
+ if (running_total != urb->transfer_buffer_length)
+ dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, "
+ "queued %#x (%d), asked for %#x (%d)\n",
+ __func__,
+ urb->ep->desc.bEndpointAddress,
+ running_total, running_total,
+ urb->transfer_buffer_length,
+ urb->transfer_buffer_length);
+}
+
+static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id,
+ unsigned int ep_index, int start_cycle,
+ struct xhci_generic_trb *start_trb, struct xhci_td *td)
+{
+ /*
+ * Pass all the TRBs to the hardware at once and make sure this write
+ * isn't reordered.
+ */
+ wmb();
+ start_trb->field[3] |= start_cycle;
+ ring_ep_doorbell(xhci, slot_id, ep_index);
+}
+
+static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+ struct urb *urb, int slot_id, unsigned int ep_index)
+{
+ struct xhci_ring *ep_ring;
+ unsigned int num_trbs;
+ struct xhci_td *td;
+ struct scatterlist *sg;
+ int num_sgs;
+ int trb_buff_len, this_sg_len, running_total;
+ bool first_trb;
+ u64 addr;
+
+ struct xhci_generic_trb *start_trb;
+ int start_cycle;
+
+ ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+ num_trbs = count_sg_trbs_needed(xhci, urb);
+ num_sgs = urb->num_sgs;
+
+ trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
+ ep_index, num_trbs, urb, &td, mem_flags);
+ if (trb_buff_len < 0)
+ return trb_buff_len;
+ /*
+ * Don't give the first TRB to the hardware (by toggling the cycle bit)
+ * until we've finished creating all the other TRBs. The ring's cycle
+ * state may change as we enqueue the other TRBs, so save it too.
+ */
+ start_trb = &ep_ring->enqueue->generic;
+ start_cycle = ep_ring->cycle_state;
+
+ running_total = 0;
+ /*
+ * How much data is in the first TRB?
+ *
+ * There are three forces at work for TRB buffer pointers and lengths:
+ * 1. We don't want to walk off the end of this sg-list entry buffer.
+ * 2. The transfer length that the driver requested may be smaller than
+ * the amount of memory allocated for this scatter-gather list.
+ * 3. TRBs buffers can't cross 64KB boundaries.
+ */
+ sg = urb->sg->sg;
+ addr = (u64) sg_dma_address(sg);
+ this_sg_len = sg_dma_len(sg);
+ trb_buff_len = TRB_MAX_BUFF_SIZE -
+ (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+ trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
+ if (trb_buff_len > urb->transfer_buffer_length)
+ trb_buff_len = urb->transfer_buffer_length;
+ xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n",
+ trb_buff_len);
+
+ first_trb = true;
+ /* Queue the first TRB, even if it's zero-length */
+ do {
+ u32 field = 0;
+ u32 length_field = 0;
+
+ /* Don't change the cycle bit of the first TRB until later */
+ if (first_trb)
+ first_trb = false;
+ else
+ field |= ep_ring->cycle_state;
+
+ /* Chain all the TRBs together; clear the chain bit in the last
+ * TRB to indicate it's the last TRB in the chain.
+ */
+ if (num_trbs > 1) {
+ field |= TRB_CHAIN;
+ } else {
+ /* FIXME - add check for ZERO_PACKET flag before this */
+ td->last_trb = ep_ring->enqueue;
+ field |= TRB_IOC;
+ }
+ xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), "
+ "64KB boundary at %#x, end dma = %#x\n",
+ (unsigned int) addr, trb_buff_len, trb_buff_len,
+ (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
+ (unsigned int) addr + trb_buff_len);
+ if (TRB_MAX_BUFF_SIZE -
+ (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)) < trb_buff_len) {
+ xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n");
+ xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n",
+ (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
+ (unsigned int) addr + trb_buff_len);
+ }
+ length_field = TRB_LEN(trb_buff_len) |
+ TD_REMAINDER(urb->transfer_buffer_length - running_total) |
+ TRB_INTR_TARGET(0);
+ queue_trb(xhci, ep_ring, false,
+ lower_32_bits(addr),
+ upper_32_bits(addr),
+ length_field,
+ /* We always want to know if the TRB was short,
+ * or we won't get an event when it completes.
+ * (Unless we use event data TRBs, which are a
+ * waste of space and HC resources.)
+ */
+ field | TRB_ISP | TRB_TYPE(TRB_NORMAL));
+ --num_trbs;
+ running_total += trb_buff_len;
+
+ /* Calculate length for next transfer --
+ * Are we done queueing all the TRBs for this sg entry?
+ */
+ this_sg_len -= trb_buff_len;
+ if (this_sg_len == 0) {
+ --num_sgs;
+ if (num_sgs == 0)
+ break;
+ sg = sg_next(sg);
+ addr = (u64) sg_dma_address(sg);
+ this_sg_len = sg_dma_len(sg);
+ } else {
+ addr += trb_buff_len;
+ }
+
+ trb_buff_len = TRB_MAX_BUFF_SIZE -
+ (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+ trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
+ if (running_total + trb_buff_len > urb->transfer_buffer_length)
+ trb_buff_len =
+ urb->transfer_buffer_length - running_total;
+ } while (running_total < urb->transfer_buffer_length);
+
+ check_trb_math(urb, num_trbs, running_total);
+ giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
+ return 0;
+}
+
+/* This is very similar to what ehci-q.c qtd_fill() does */
+int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+ struct urb *urb, int slot_id, unsigned int ep_index)
+{
+ struct xhci_ring *ep_ring;
+ struct xhci_td *td;
+ int num_trbs;
+ struct xhci_generic_trb *start_trb;
+ bool first_trb;
+ int start_cycle;
+ u32 field, length_field;
+
+ int running_total, trb_buff_len, ret;
+ u64 addr;
+
+ if (urb->sg)
+ return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index);
+
+ ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+
+ num_trbs = 0;
+ /* How much data is (potentially) left before the 64KB boundary? */
+ running_total = TRB_MAX_BUFF_SIZE -
+ (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+
+ /* If there's some data on this 64KB chunk, or we have to send a
+ * zero-length transfer, we need at least one TRB
+ */
+ if (running_total != 0 || urb->transfer_buffer_length == 0)
+ num_trbs++;
+ /* How many more 64KB chunks to transfer, how many more TRBs? */
+ while (running_total < urb->transfer_buffer_length) {
+ num_trbs++;
+ running_total += TRB_MAX_BUFF_SIZE;
+ }
+ /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */
+
+ if (!in_interrupt())
+ dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d), addr = %#llx, num_trbs = %d\n",
+ urb->ep->desc.bEndpointAddress,
+ urb->transfer_buffer_length,
+ urb->transfer_buffer_length,
+ (unsigned long long)urb->transfer_dma,
+ num_trbs);
+
+ ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index,
+ num_trbs, urb, &td, mem_flags);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Don't give the first TRB to the hardware (by toggling the cycle bit)
+ * until we've finished creating all the other TRBs. The ring's cycle
+ * state may change as we enqueue the other TRBs, so save it too.
+ */
+ start_trb = &ep_ring->enqueue->generic;
+ start_cycle = ep_ring->cycle_state;
+
+ running_total = 0;
+ /* How much data is in the first TRB? */
+ addr = (u64) urb->transfer_dma;
+ trb_buff_len = TRB_MAX_BUFF_SIZE -
+ (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+ if (urb->transfer_buffer_length < trb_buff_len)
+ trb_buff_len = urb->transfer_buffer_length;
+
+ first_trb = true;
+
+ /* Queue the first TRB, even if it's zero-length */
+ do {
+ field = 0;
+
+ /* Don't change the cycle bit of the first TRB until later */
+ if (first_trb)
+ first_trb = false;
+ else
+ field |= ep_ring->cycle_state;
+
+ /* Chain all the TRBs together; clear the chain bit in the last
+ * TRB to indicate it's the last TRB in the chain.
+ */
+ if (num_trbs > 1) {
+ field |= TRB_CHAIN;
+ } else {
+ /* FIXME - add check for ZERO_PACKET flag before this */
+ td->last_trb = ep_ring->enqueue;
+ field |= TRB_IOC;
+ }
+ length_field = TRB_LEN(trb_buff_len) |
+ TD_REMAINDER(urb->transfer_buffer_length - running_total) |
+ TRB_INTR_TARGET(0);
+ queue_trb(xhci, ep_ring, false,
+ lower_32_bits(addr),
+ upper_32_bits(addr),
+ length_field,
+ /* We always want to know if the TRB was short,
+ * or we won't get an event when it completes.
+ * (Unless we use event data TRBs, which are a
+ * waste of space and HC resources.)
+ */
+ field | TRB_ISP | TRB_TYPE(TRB_NORMAL));
+ --num_trbs;
+ running_total += trb_buff_len;
+
+ /* Calculate length for next transfer */
+ addr += trb_buff_len;
+ trb_buff_len = urb->transfer_buffer_length - running_total;
+ if (trb_buff_len > TRB_MAX_BUFF_SIZE)
+ trb_buff_len = TRB_MAX_BUFF_SIZE;
+ } while (running_total < urb->transfer_buffer_length);
+
+ check_trb_math(urb, num_trbs, running_total);
+ giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
+ return 0;
+}
+
/* Caller must have locked xhci->lock */
-int queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
struct urb *urb, int slot_id, unsigned int ep_index)
{
struct xhci_ring *ep_ring;
struct usb_ctrlrequest *setup;
struct xhci_generic_trb *start_trb;
int start_cycle;
- u32 field;
+ u32 field, length_field;
struct xhci_td *td;
ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
*/
if (urb->transfer_buffer_length > 0)
num_trbs++;
- ret = xhci_prepare_transfer(xhci, xhci->devs[slot_id], ep_index, num_trbs,
+ ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, num_trbs,
urb, &td, mem_flags);
if (ret < 0)
return ret;
/* If there's data, queue data TRBs */
field = 0;
+ length_field = TRB_LEN(urb->transfer_buffer_length) |
+ TD_REMAINDER(urb->transfer_buffer_length) |
+ TRB_INTR_TARGET(0);
if (urb->transfer_buffer_length > 0) {
if (setup->bRequestType & USB_DIR_IN)
field |= TRB_DIR_IN;
queue_trb(xhci, ep_ring, false,
lower_32_bits(urb->transfer_dma),
upper_32_bits(urb->transfer_dma),
- TRB_LEN(urb->transfer_buffer_length) | TRB_INTR_TARGET(0),
+ length_field,
/* Event on short tx */
field | TRB_ISP | TRB_TYPE(TRB_DATA) | ep_ring->cycle_state);
}
/* Event on completion */
field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state);
- /*
- * Pass all the TRBs to the hardware at once and make sure this write
- * isn't reordered.
- */
- wmb();
- start_trb->field[3] |= start_cycle;
- field = xhci_readl(xhci, &xhci->dba->doorbell[slot_id]) & DB_MASK;
- xhci_writel(xhci, field | EPI_TO_DB(ep_index), &xhci->dba->doorbell[slot_id]);
- /* Flush PCI posted writes */
- xhci_readl(xhci, &xhci->dba->doorbell[slot_id]);
-
+ giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
return 0;
}
* Place a no-op command on the command ring to test the command and
* event ring.
*/
-void *setup_one_noop(struct xhci_hcd *xhci)
+void *xhci_setup_one_noop(struct xhci_hcd *xhci)
{
if (queue_cmd_noop(xhci) < 0)
return NULL;
xhci->noops_submitted++;
- return ring_cmd_db;
+ return xhci_ring_cmd_db;
}
/* Queue a slot enable or disable request on the command ring */
-int queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id)
+int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id)
{
return queue_command(xhci, 0, 0, 0,
TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id));
}
/* Queue an address device command TRB */
-int queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, u32 slot_id)
+int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+ u32 slot_id)
{
- return queue_command(xhci, in_ctx_ptr, 0, 0,
+ return queue_command(xhci, lower_32_bits(in_ctx_ptr),
+ upper_32_bits(in_ctx_ptr), 0,
TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id));
}
+
+/* Queue a configure endpoint command TRB */
+int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+ u32 slot_id)
+{
+ return queue_command(xhci, lower_32_bits(in_ctx_ptr),
+ upper_32_bits(in_ctx_ptr), 0,
+ TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id));
+}
+
+int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
+ unsigned int ep_index)
+{
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 type = TRB_TYPE(TRB_STOP_RING);
+
+ return queue_command(xhci, 0, 0, 0,
+ trb_slot_id | trb_ep_index | type);
+}
+
+/* Set Transfer Ring Dequeue Pointer command.
+ * This should not be used for endpoints that have streams enabled.
+ */
+static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
+ unsigned int ep_index, struct xhci_segment *deq_seg,
+ union xhci_trb *deq_ptr, u32 cycle_state)
+{
+ dma_addr_t addr;
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 type = TRB_TYPE(TRB_SET_DEQ);
+
+ addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr);
+ if (addr == 0) {
+ xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n");
+ xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n",
+ deq_seg, deq_ptr);
+ return 0;
+ }
+ return queue_command(xhci, lower_32_bits(addr) | cycle_state,
+ upper_32_bits(addr), 0,
+ trb_slot_id | trb_ep_index | type);
+}
+
+int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id,
+ unsigned int ep_index)
+{
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 type = TRB_TYPE(TRB_RESET_EP);
+
+ return queue_command(xhci, 0, 0, 0, trb_slot_id | trb_ep_index | type);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff