2 * xHCI host controller driver
4 * Copyright (C) 2008 Intel Corp.
7 * Some code borrowed from the Linux EHCI driver.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * Ring initialization rules:
25 * 1. Each segment is initialized to zero, except for link TRBs.
26 * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or
27 * Consumer Cycle State (CCS), depending on ring function.
28 * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
30 * Ring behavior rules:
31 * 1. A ring is empty if enqueue == dequeue. This means there will always be at
32 * least one free TRB in the ring. This is useful if you want to turn that
33 * into a link TRB and expand the ring.
34 * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
35 * link TRB, then load the pointer with the address in the link TRB. If the
36 * link TRB had its toggle bit set, you may need to update the ring cycle
37 * state (see cycle bit rules). You may have to do this multiple times
38 * until you reach a non-link TRB.
39 * 3. A ring is full if enqueue++ (for the definition of increment above)
40 * equals the dequeue pointer.
43 * 1. When a consumer increments a dequeue pointer and encounters a toggle bit
44 * in a link TRB, it must toggle the ring cycle state.
45 * 2. When a producer increments an enqueue pointer and encounters a toggle bit
46 * in a link TRB, it must toggle the ring cycle state.
49 * 1. Check if ring is full before you enqueue.
50 * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
51 * Update enqueue pointer between each write (which may update the ring
53 * 3. Notify consumer. If SW is producer, it rings the doorbell for command
54 * and endpoint rings. If HC is the producer for the event ring,
55 * and it generates an interrupt according to interrupt modulation rules.
58 * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state,
59 * the TRB is owned by the consumer.
60 * 2. Update dequeue pointer (which may update the ring cycle state) and
61 * continue processing TRBs until you reach a TRB which is not owned by you.
62 * 3. Notify the producer. SW is the consumer for the event ring, and it
63 * updates event ring dequeue pointer. HC is the consumer for the command and
64 * endpoint rings; it generates events on the event ring for these.
67 #include <linux/scatterlist.h>
68 #include <linux/slab.h>
71 static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
72 struct xhci_virt_device *virt_dev,
73 struct xhci_event_cmd *event);
76 * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
79 dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
82 unsigned long segment_offset;
84 if (!seg || !trb || trb < seg->trbs)
87 segment_offset = trb - seg->trbs;
88 if (segment_offset >= TRBS_PER_SEGMENT)
90 return seg->dma + (segment_offset * sizeof(*trb));
93 /* Does this link TRB point to the first segment in a ring,
94 * or was the previous TRB the last TRB on the last segment in the ERST?
96 static bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring,
97 struct xhci_segment *seg, union xhci_trb *trb)
99 if (ring == xhci->event_ring)
100 return (trb == &seg->trbs[TRBS_PER_SEGMENT]) &&
101 (seg->next == xhci->event_ring->first_seg);
103 return le32_to_cpu(trb->link.control) & LINK_TOGGLE;
106 /* Is this TRB a link TRB or was the last TRB the last TRB in this event ring
107 * segment? I.e. would the updated event TRB pointer step off the end of the
110 static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
111 struct xhci_segment *seg, union xhci_trb *trb)
113 if (ring == xhci->event_ring)
114 return trb == &seg->trbs[TRBS_PER_SEGMENT];
116 return TRB_TYPE_LINK_LE32(trb->link.control);
119 static int enqueue_is_link_trb(struct xhci_ring *ring)
121 struct xhci_link_trb *link = &ring->enqueue->link;
122 return TRB_TYPE_LINK_LE32(link->control);
125 /* Updates trb to point to the next TRB in the ring, and updates seg if the next
126 * TRB is in a new segment. This does not skip over link TRBs, and it does not
127 * effect the ring dequeue or enqueue pointers.
129 static void next_trb(struct xhci_hcd *xhci,
130 struct xhci_ring *ring,
131 struct xhci_segment **seg,
132 union xhci_trb **trb)
134 if (last_trb(xhci, ring, *seg, *trb)) {
136 *trb = ((*seg)->trbs);
143 * See Cycle bit rules. SW is the consumer for the event ring only.
144 * Don't make a ring full of link TRBs. That would be dumb and this would loop.
146 static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
148 unsigned long long addr;
154 * Update the dequeue pointer further if that was a link TRB or
155 * we're at the end of an event ring segment (which doesn't have
158 if (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) {
159 if (consumer && last_trb_on_last_seg(xhci, ring,
160 ring->deq_seg, ring->dequeue)) {
162 xhci_dbg(xhci, "Toggle cycle state "
163 "for ring %p = %i\n",
167 ring->cycle_state = (ring->cycle_state ? 0 : 1);
169 ring->deq_seg = ring->deq_seg->next;
170 ring->dequeue = ring->deq_seg->trbs;
174 } while (last_trb(xhci, ring, ring->deq_seg, ring->dequeue));
176 addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
180 * See Cycle bit rules. SW is the consumer for the event ring only.
181 * Don't make a ring full of link TRBs. That would be dumb and this would loop.
183 * If we've just enqueued a TRB that is in the middle of a TD (meaning the
184 * chain bit is set), then set the chain bit in all the following link TRBs.
185 * If we've enqueued the last TRB in a TD, make sure the following link TRBs
186 * have their chain bit cleared (so that each Link TRB is a separate TD).
188 * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit
189 * set, but other sections talk about dealing with the chain bit set. This was
190 * fixed in the 0.96 specification errata, but we have to assume that all 0.95
191 * xHCI hardware can't handle the chain bit being cleared on a link TRB.
193 * @more_trbs_coming: Will you enqueue more TRBs before calling
194 * prepare_transfer()?
196 static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
197 bool consumer, bool more_trbs_coming, bool isoc)
200 union xhci_trb *next;
201 unsigned long long addr;
203 chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
204 next = ++(ring->enqueue);
207 /* Update the dequeue pointer further if that was a link TRB or we're at
208 * the end of an event ring segment (which doesn't have link TRBS)
210 while (last_trb(xhci, ring, ring->enq_seg, next)) {
212 if (ring != xhci->event_ring) {
214 * If the caller doesn't plan on enqueueing more
215 * TDs before ringing the doorbell, then we
216 * don't want to give the link TRB to the
217 * hardware just yet. We'll give the link TRB
218 * back in prepare_ring() just before we enqueue
219 * the TD at the top of the ring.
221 if (!chain && !more_trbs_coming)
224 /* If we're not dealing with 0.95 hardware or
225 * isoc rings on AMD 0.96 host,
226 * carry over the chain bit of the previous TRB
227 * (which may mean the chain bit is cleared).
229 if (!(isoc && (xhci->quirks & XHCI_AMD_0x96_HOST))
230 && !xhci_link_trb_quirk(xhci)) {
231 next->link.control &=
232 cpu_to_le32(~TRB_CHAIN);
233 next->link.control |=
236 /* Give this link TRB to the hardware */
238 next->link.control ^= cpu_to_le32(TRB_CYCLE);
240 /* Toggle the cycle bit after the last ring segment. */
241 if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
242 ring->cycle_state = (ring->cycle_state ? 0 : 1);
244 xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
246 (unsigned int) ring->cycle_state);
249 ring->enq_seg = ring->enq_seg->next;
250 ring->enqueue = ring->enq_seg->trbs;
251 next = ring->enqueue;
253 addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
257 * Check to see if there's room to enqueue num_trbs on the ring. See rules
259 * FIXME: this would be simpler and faster if we just kept track of the number
260 * of free TRBs in a ring.
262 static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
263 unsigned int num_trbs)
266 union xhci_trb *enq = ring->enqueue;
267 struct xhci_segment *enq_seg = ring->enq_seg;
268 struct xhci_segment *cur_seg;
269 unsigned int left_on_ring;
271 /* If we are currently pointing to a link TRB, advance the
272 * enqueue pointer before checking for space */
273 while (last_trb(xhci, ring, enq_seg, enq)) {
274 enq_seg = enq_seg->next;
278 /* Check if ring is empty */
279 if (enq == ring->dequeue) {
280 /* Can't use link trbs */
281 left_on_ring = TRBS_PER_SEGMENT - 1;
282 for (cur_seg = enq_seg->next; cur_seg != enq_seg;
283 cur_seg = cur_seg->next)
284 left_on_ring += TRBS_PER_SEGMENT - 1;
286 /* Always need one TRB free in the ring. */
288 if (num_trbs > left_on_ring) {
289 xhci_warn(xhci, "Not enough room on ring; "
290 "need %u TRBs, %u TRBs left\n",
291 num_trbs, left_on_ring);
296 /* Make sure there's an extra empty TRB available */
297 for (i = 0; i <= num_trbs; ++i) {
298 if (enq == ring->dequeue)
301 while (last_trb(xhci, ring, enq_seg, enq)) {
302 enq_seg = enq_seg->next;
309 /* Ring the host controller doorbell after placing a command on the ring */
310 void xhci_ring_cmd_db(struct xhci_hcd *xhci)
312 if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING))
315 xhci_dbg(xhci, "// Ding dong!\n");
316 xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]);
317 /* Flush PCI posted writes */
318 xhci_readl(xhci, &xhci->dba->doorbell[0]);
321 static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
326 xhci_dbg(xhci, "Abort command ring\n");
328 if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING)) {
329 xhci_dbg(xhci, "The command ring isn't running, "
330 "Have the command ring been stopped?\n");
334 temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
335 if (!(temp_64 & CMD_RING_RUNNING)) {
336 xhci_dbg(xhci, "Command ring had been stopped\n");
339 xhci->cmd_ring_state = CMD_RING_STATE_ABORTED;
340 xhci_write_64(xhci, temp_64 | CMD_RING_ABORT,
341 &xhci->op_regs->cmd_ring);
343 /* Section 4.6.1.2 of xHCI 1.0 spec says software should
344 * time the completion od all xHCI commands, including
345 * the Command Abort operation. If software doesn't see
346 * CRR negated in a timely manner (e.g. longer than 5
347 * seconds), then it should assume that the there are
348 * larger problems with the xHC and assert HCRST.
350 ret = handshake(xhci, &xhci->op_regs->cmd_ring,
351 CMD_RING_RUNNING, 0, 5 * 1000 * 1000);
353 /* we are about to kill xhci, give it one more chance */
354 xhci_write_64(xhci, temp_64 | CMD_RING_ABORT,
355 &xhci->op_regs->cmd_ring);
357 ret = handshake(xhci, &xhci->op_regs->cmd_ring,
358 CMD_RING_RUNNING, 0, 3 * 1000 * 1000);
362 xhci_err(xhci, "Stopped the command ring failed, "
363 "maybe the host is dead\n");
364 xhci->xhc_state |= XHCI_STATE_DYING;
373 static int xhci_queue_cd(struct xhci_hcd *xhci,
374 struct xhci_command *command,
375 union xhci_trb *cmd_trb)
378 cd = kzalloc(sizeof(struct xhci_cd), GFP_ATOMIC);
381 INIT_LIST_HEAD(&cd->cancel_cmd_list);
383 cd->command = command;
384 cd->cmd_trb = cmd_trb;
385 list_add_tail(&cd->cancel_cmd_list, &xhci->cancel_cmd_list);
391 * Cancel the command which has issue.
393 * Some commands may hang due to waiting for acknowledgement from
394 * usb device. It is outside of the xHC's ability to control and
395 * will cause the command ring is blocked. When it occurs software
396 * should intervene to recover the command ring.
397 * See Section 4.6.1.1 and 4.6.1.2
399 int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command,
400 union xhci_trb *cmd_trb)
405 spin_lock_irqsave(&xhci->lock, flags);
407 if (xhci->xhc_state & XHCI_STATE_DYING) {
408 xhci_warn(xhci, "Abort the command ring,"
409 " but the xHCI is dead.\n");
414 /* queue the cmd desriptor to cancel_cmd_list */
415 retval = xhci_queue_cd(xhci, command, cmd_trb);
417 xhci_warn(xhci, "Queuing command descriptor failed.\n");
421 /* abort command ring */
422 retval = xhci_abort_cmd_ring(xhci);
424 xhci_err(xhci, "Abort command ring failed\n");
425 if (unlikely(retval == -ESHUTDOWN)) {
426 spin_unlock_irqrestore(&xhci->lock, flags);
427 usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
428 xhci_dbg(xhci, "xHCI host controller is dead.\n");
434 spin_unlock_irqrestore(&xhci->lock, flags);
438 void xhci_ring_ep_doorbell(struct xhci_hcd *xhci,
439 unsigned int slot_id,
440 unsigned int ep_index,
441 unsigned int stream_id)
443 __le32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
444 struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
445 unsigned int ep_state = ep->ep_state;
447 /* Don't ring the doorbell for this endpoint if there are pending
448 * cancellations because we don't want to interrupt processing.
449 * We don't want to restart any stream rings if there's a set dequeue
450 * pointer command pending because the device can choose to start any
451 * stream once the endpoint is on the HW schedule.
452 * FIXME - check all the stream rings for pending cancellations.
454 if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) ||
455 (ep_state & EP_HALTED))
457 xhci_writel(xhci, DB_VALUE(ep_index, stream_id), db_addr);
458 /* The CPU has better things to do at this point than wait for a
459 * write-posting flush. It'll get there soon enough.
463 /* Ring the doorbell for any rings with pending URBs */
464 static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci,
465 unsigned int slot_id,
466 unsigned int ep_index)
468 unsigned int stream_id;
469 struct xhci_virt_ep *ep;
471 ep = &xhci->devs[slot_id]->eps[ep_index];
473 /* A ring has pending URBs if its TD list is not empty */
474 if (!(ep->ep_state & EP_HAS_STREAMS)) {
475 if (ep->ring && !(list_empty(&ep->ring->td_list)))
476 xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0);
480 for (stream_id = 1; stream_id < ep->stream_info->num_streams;
482 struct xhci_stream_info *stream_info = ep->stream_info;
483 if (!list_empty(&stream_info->stream_rings[stream_id]->td_list))
484 xhci_ring_ep_doorbell(xhci, slot_id, ep_index,
490 * Find the segment that trb is in. Start searching in start_seg.
491 * If we must move past a segment that has a link TRB with a toggle cycle state
492 * bit set, then we will toggle the value pointed at by cycle_state.
494 static struct xhci_segment *find_trb_seg(
495 struct xhci_segment *start_seg,
496 union xhci_trb *trb, int *cycle_state)
498 struct xhci_segment *cur_seg = start_seg;
499 struct xhci_generic_trb *generic_trb;
501 while (cur_seg->trbs > trb ||
502 &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
503 generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
504 if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE))
506 cur_seg = cur_seg->next;
507 if (cur_seg == start_seg)
508 /* Looped over the entire list. Oops! */
515 static struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci,
516 unsigned int slot_id, unsigned int ep_index,
517 unsigned int stream_id)
519 struct xhci_virt_ep *ep;
521 ep = &xhci->devs[slot_id]->eps[ep_index];
522 /* Common case: no streams */
523 if (!(ep->ep_state & EP_HAS_STREAMS))
526 if (stream_id == 0) {
528 "WARN: Slot ID %u, ep index %u has streams, "
529 "but URB has no stream ID.\n",
534 if (stream_id < ep->stream_info->num_streams)
535 return ep->stream_info->stream_rings[stream_id];
538 "WARN: Slot ID %u, ep index %u has "
539 "stream IDs 1 to %u allocated, "
540 "but stream ID %u is requested.\n",
542 ep->stream_info->num_streams - 1,
547 /* Get the right ring for the given URB.
548 * If the endpoint supports streams, boundary check the URB's stream ID.
549 * If the endpoint doesn't support streams, return the singular endpoint ring.
551 static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
554 return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id,
555 xhci_get_endpoint_index(&urb->ep->desc), urb->stream_id);
559 * Move the xHC's endpoint ring dequeue pointer past cur_td.
560 * Record the new state of the xHC's endpoint ring dequeue segment,
561 * dequeue pointer, and new consumer cycle state in state.
562 * Update our internal representation of the ring's dequeue pointer.
564 * We do this in three jumps:
565 * - First we update our new ring state to be the same as when the xHC stopped.
566 * - Then we traverse the ring to find the segment that contains
567 * the last TRB in the TD. We toggle the xHC's new cycle state when we pass
568 * any link TRBs with the toggle cycle bit set.
569 * - Finally we move the dequeue state one TRB further, toggling the cycle bit
570 * if we've moved it past a link TRB with the toggle cycle bit set.
572 * Some of the uses of xhci_generic_trb are grotty, but if they're done
573 * with correct __le32 accesses they should work fine. Only users of this are
576 void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
577 unsigned int slot_id, unsigned int ep_index,
578 unsigned int stream_id, struct xhci_td *cur_td,
579 struct xhci_dequeue_state *state)
581 struct xhci_virt_device *dev = xhci->devs[slot_id];
582 struct xhci_virt_ep *ep = &dev->eps[ep_index];
583 struct xhci_ring *ep_ring;
584 struct xhci_segment *new_seg;
585 union xhci_trb *new_deq;
588 bool cycle_found = false;
589 bool td_last_trb_found = false;
591 ep_ring = xhci_triad_to_transfer_ring(xhci, slot_id,
592 ep_index, stream_id);
594 xhci_warn(xhci, "WARN can't find new dequeue state "
595 "for invalid stream ID %u.\n",
600 /* Dig out the cycle state saved by the xHC during the stop ep cmd */
601 xhci_dbg(xhci, "Finding endpoint context\n");
602 /* 4.6.9 the css flag is written to the stream context for streams */
603 if (ep->ep_state & EP_HAS_STREAMS) {
604 struct xhci_stream_ctx *ctx =
605 &ep->stream_info->stream_ctx_array[stream_id];
606 hw_dequeue = le64_to_cpu(ctx->stream_ring);
608 struct xhci_ep_ctx *ep_ctx
609 = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
610 hw_dequeue = le64_to_cpu(ep_ctx->deq);
613 new_seg = ep_ring->deq_seg;
614 new_deq = ep_ring->dequeue;
615 state->new_cycle_state = hw_dequeue & 0x1;
618 * We want to find the pointer, segment and cycle state of the new trb
619 * (the one after current TD's last_trb). We know the cycle state at
620 * hw_dequeue, so walk the ring until both hw_dequeue and last_trb are
624 if (!cycle_found && xhci_trb_virt_to_dma(new_seg, new_deq)
625 == (dma_addr_t)(hw_dequeue & ~0xf)) {
627 if (td_last_trb_found)
630 if (new_deq == cur_td->last_trb)
631 td_last_trb_found = true;
634 TRB_TYPE_LINK_LE32(new_deq->generic.field[3]) &&
635 new_deq->generic.field[3] & cpu_to_le32(LINK_TOGGLE))
636 state->new_cycle_state ^= 0x1;
638 next_trb(xhci, ep_ring, &new_seg, &new_deq);
640 /* Search wrapped around, bail out */
641 if (new_deq == ep->ring->dequeue) {
642 xhci_err(xhci, "Error: Failed finding new dequeue state\n");
643 state->new_deq_seg = NULL;
644 state->new_deq_ptr = NULL;
648 } while (!cycle_found || !td_last_trb_found);
650 state->new_deq_seg = new_seg;
651 state->new_deq_ptr = new_deq;
653 /* Don't update the ring cycle state for the producer (us). */
654 xhci_dbg(xhci, "Cycle state = 0x%x\n", state->new_cycle_state);
656 xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
658 addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
659 xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
660 (unsigned long long) addr);
663 /* flip_cycle means flip the cycle bit of all but the first and last TRB.
664 * (The last TRB actually points to the ring enqueue pointer, which is not part
665 * of this TD.) This is used to remove partially enqueued isoc TDs from a ring.
667 static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
668 struct xhci_td *cur_td, bool flip_cycle)
670 struct xhci_segment *cur_seg;
671 union xhci_trb *cur_trb;
673 for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
675 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
676 if (TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) {
677 /* Unchain any chained Link TRBs, but
678 * leave the pointers intact.
680 cur_trb->generic.field[3] &= cpu_to_le32(~TRB_CHAIN);
681 /* Flip the cycle bit (link TRBs can't be the first
685 cur_trb->generic.field[3] ^=
686 cpu_to_le32(TRB_CYCLE);
687 xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
688 xhci_dbg(xhci, "Address = %p (0x%llx dma); "
689 "in seg %p (0x%llx dma)\n",
691 (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
693 (unsigned long long)cur_seg->dma);
695 cur_trb->generic.field[0] = 0;
696 cur_trb->generic.field[1] = 0;
697 cur_trb->generic.field[2] = 0;
698 /* Preserve only the cycle bit of this TRB */
699 cur_trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE);
700 /* Flip the cycle bit except on the first or last TRB */
701 if (flip_cycle && cur_trb != cur_td->first_trb &&
702 cur_trb != cur_td->last_trb)
703 cur_trb->generic.field[3] ^=
704 cpu_to_le32(TRB_CYCLE);
705 cur_trb->generic.field[3] |= cpu_to_le32(
706 TRB_TYPE(TRB_TR_NOOP));
707 xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
708 "in seg %p (0x%llx dma)\n",
710 (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
712 (unsigned long long)cur_seg->dma);
714 if (cur_trb == cur_td->last_trb)
719 static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
720 unsigned int ep_index, unsigned int stream_id,
721 struct xhci_segment *deq_seg,
722 union xhci_trb *deq_ptr, u32 cycle_state);
724 void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
725 unsigned int slot_id, unsigned int ep_index,
726 unsigned int stream_id,
727 struct xhci_dequeue_state *deq_state)
729 struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
731 xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
732 "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
733 deq_state->new_deq_seg,
734 (unsigned long long)deq_state->new_deq_seg->dma,
735 deq_state->new_deq_ptr,
736 (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr),
737 deq_state->new_cycle_state);
738 queue_set_tr_deq(xhci, slot_id, ep_index, stream_id,
739 deq_state->new_deq_seg,
740 deq_state->new_deq_ptr,
741 (u32) deq_state->new_cycle_state);
742 /* Stop the TD queueing code from ringing the doorbell until
743 * this command completes. The HC won't set the dequeue pointer
744 * if the ring is running, and ringing the doorbell starts the
747 ep->ep_state |= SET_DEQ_PENDING;
750 static void xhci_stop_watchdog_timer_in_irq(struct xhci_hcd *xhci,
751 struct xhci_virt_ep *ep)
753 ep->ep_state &= ~EP_HALT_PENDING;
754 /* Can't del_timer_sync in interrupt, so we attempt to cancel. If the
755 * timer is running on another CPU, we don't decrement stop_cmds_pending
756 * (since we didn't successfully stop the watchdog timer).
758 if (del_timer(&ep->stop_cmd_timer))
759 ep->stop_cmds_pending--;
762 /* Must be called with xhci->lock held in interrupt context */
763 static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci,
764 struct xhci_td *cur_td, int status, char *adjective)
768 struct urb_priv *urb_priv;
771 urb_priv = urb->hcpriv;
773 hcd = bus_to_hcd(urb->dev->bus);
775 /* Only giveback urb when this is the last td in urb */
776 if (urb_priv->td_cnt == urb_priv->length) {
777 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
778 xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
779 if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) {
780 if (xhci->quirks & XHCI_AMD_PLL_FIX)
781 usb_amd_quirk_pll_enable();
784 usb_hcd_unlink_urb_from_ep(hcd, urb);
786 spin_unlock(&xhci->lock);
787 usb_hcd_giveback_urb(hcd, urb, status);
788 xhci_urb_free_priv(xhci, urb_priv);
789 spin_lock(&xhci->lock);
794 * When we get a command completion for a Stop Endpoint Command, we need to
795 * unlink any cancelled TDs from the ring. There are two ways to do that:
797 * 1. If the HW was in the middle of processing the TD that needs to be
798 * cancelled, then we must move the ring's dequeue pointer past the last TRB
799 * in the TD with a Set Dequeue Pointer Command.
800 * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain
801 * bit cleared) so that the HW will skip over them.
803 static void handle_stopped_endpoint(struct xhci_hcd *xhci,
804 union xhci_trb *trb, struct xhci_event_cmd *event)
806 unsigned int slot_id;
807 unsigned int ep_index;
808 struct xhci_virt_device *virt_dev;
809 struct xhci_ring *ep_ring;
810 struct xhci_virt_ep *ep;
811 struct list_head *entry;
812 struct xhci_td *cur_td = NULL;
813 struct xhci_td *last_unlinked_td;
815 struct xhci_dequeue_state deq_state;
817 if (unlikely(TRB_TO_SUSPEND_PORT(
818 le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])))) {
819 slot_id = TRB_TO_SLOT_ID(
820 le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
821 virt_dev = xhci->devs[slot_id];
823 handle_cmd_in_cmd_wait_list(xhci, virt_dev,
826 xhci_warn(xhci, "Stop endpoint command "
827 "completion for disabled slot %u\n",
832 memset(&deq_state, 0, sizeof(deq_state));
833 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
834 ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
835 ep = &xhci->devs[slot_id]->eps[ep_index];
837 if (list_empty(&ep->cancelled_td_list)) {
838 xhci_stop_watchdog_timer_in_irq(xhci, ep);
839 ep->stopped_td = NULL;
840 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
844 /* Fix up the ep ring first, so HW stops executing cancelled TDs.
845 * We have the xHCI lock, so nothing can modify this list until we drop
846 * it. We're also in the event handler, so we can't get re-interrupted
847 * if another Stop Endpoint command completes
849 list_for_each(entry, &ep->cancelled_td_list) {
850 cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
851 xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
853 (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb));
854 ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb);
856 /* This shouldn't happen unless a driver is mucking
857 * with the stream ID after submission. This will
858 * leave the TD on the hardware ring, and the hardware
859 * will try to execute it, and may access a buffer
860 * that has already been freed. In the best case, the
861 * hardware will execute it, and the event handler will
862 * ignore the completion event for that TD, since it was
863 * removed from the td_list for that endpoint. In
864 * short, don't muck with the stream ID after
867 xhci_warn(xhci, "WARN Cancelled URB %p "
868 "has invalid stream ID %u.\n",
870 cur_td->urb->stream_id);
871 goto remove_finished_td;
874 * If we stopped on the TD we need to cancel, then we have to
875 * move the xHC endpoint ring dequeue pointer past this TD.
877 if (cur_td == ep->stopped_td)
878 xhci_find_new_dequeue_state(xhci, slot_id, ep_index,
879 cur_td->urb->stream_id,
882 td_to_noop(xhci, ep_ring, cur_td, false);
885 * The event handler won't see a completion for this TD anymore,
886 * so remove it from the endpoint ring's TD list. Keep it in
887 * the cancelled TD list for URB completion later.
889 list_del_init(&cur_td->td_list);
891 last_unlinked_td = cur_td;
892 xhci_stop_watchdog_timer_in_irq(xhci, ep);
894 /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
895 if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
896 xhci_queue_new_dequeue_state(xhci,
898 ep->stopped_td->urb->stream_id,
900 xhci_ring_cmd_db(xhci);
902 /* Otherwise ring the doorbell(s) to restart queued transfers */
903 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
906 /* Clear stopped_td if endpoint is not halted */
907 if (!(ep->ep_state & EP_HALTED))
908 ep->stopped_td = NULL;
911 * Drop the lock and complete the URBs in the cancelled TD list.
912 * New TDs to be cancelled might be added to the end of the list before
913 * we can complete all the URBs for the TDs we already unlinked.
914 * So stop when we've completed the URB for the last TD we unlinked.
917 cur_td = list_entry(ep->cancelled_td_list.next,
918 struct xhci_td, cancelled_td_list);
919 list_del_init(&cur_td->cancelled_td_list);
921 /* Clean up the cancelled URB */
922 /* Doesn't matter what we pass for status, since the core will
923 * just overwrite it (because the URB has been unlinked).
925 xhci_giveback_urb_in_irq(xhci, cur_td, 0, "cancelled");
927 /* Stop processing the cancelled list if the watchdog timer is
930 if (xhci->xhc_state & XHCI_STATE_DYING)
932 } while (cur_td != last_unlinked_td);
934 /* Return to the event handler with xhci->lock re-acquired */
937 /* Watchdog timer function for when a stop endpoint command fails to complete.
938 * In this case, we assume the host controller is broken or dying or dead. The
939 * host may still be completing some other events, so we have to be careful to
940 * let the event ring handler and the URB dequeueing/enqueueing functions know
941 * through xhci->state.
943 * The timer may also fire if the host takes a very long time to respond to the
944 * command, and the stop endpoint command completion handler cannot delete the
945 * timer before the timer function is called. Another endpoint cancellation may
946 * sneak in before the timer function can grab the lock, and that may queue
947 * another stop endpoint command and add the timer back. So we cannot use a
948 * simple flag to say whether there is a pending stop endpoint command for a
949 * particular endpoint.
951 * Instead we use a combination of that flag and a counter for the number of
952 * pending stop endpoint commands. If the timer is the tail end of the last
953 * stop endpoint command, and the endpoint's command is still pending, we assume
956 void xhci_stop_endpoint_command_watchdog(unsigned long arg)
958 struct xhci_hcd *xhci;
959 struct xhci_virt_ep *ep;
960 struct xhci_virt_ep *temp_ep;
961 struct xhci_ring *ring;
962 struct xhci_td *cur_td;
966 ep = (struct xhci_virt_ep *) arg;
969 spin_lock_irqsave(&xhci->lock, flags);
971 ep->stop_cmds_pending--;
972 if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
973 xhci_dbg(xhci, "Stop EP timer ran, but no command pending, "
975 spin_unlock_irqrestore(&xhci->lock, flags);
979 xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
980 xhci_warn(xhci, "Assuming host is dying, halting host.\n");
981 /* Oops, HC is dead or dying or at least not responding to the stop
984 xhci->xhc_state |= XHCI_STATE_DYING;
985 /* Disable interrupts from the host controller and start halting it */
987 spin_unlock_irqrestore(&xhci->lock, flags);
989 ret = xhci_halt(xhci);
991 spin_lock_irqsave(&xhci->lock, flags);
993 /* This is bad; the host is not responding to commands and it's
994 * not allowing itself to be halted. At least interrupts are
995 * disabled. If we call usb_hc_died(), it will attempt to
996 * disconnect all device drivers under this host. Those
997 * disconnect() methods will wait for all URBs to be unlinked,
998 * so we must complete them.
1000 xhci_warn(xhci, "Non-responsive xHCI host is not halting.\n");
1001 xhci_warn(xhci, "Completing active URBs anyway.\n");
1002 /* We could turn all TDs on the rings to no-ops. This won't
1003 * help if the host has cached part of the ring, and is slow if
1004 * we want to preserve the cycle bit. Skip it and hope the host
1005 * doesn't touch the memory.
1008 for (i = 0; i < MAX_HC_SLOTS; i++) {
1011 for (j = 0; j < 31; j++) {
1012 temp_ep = &xhci->devs[i]->eps[j];
1013 ring = temp_ep->ring;
1016 xhci_dbg(xhci, "Killing URBs for slot ID %u, "
1017 "ep index %u\n", i, j);
1018 while (!list_empty(&ring->td_list)) {
1019 cur_td = list_first_entry(&ring->td_list,
1022 list_del_init(&cur_td->td_list);
1023 if (!list_empty(&cur_td->cancelled_td_list))
1024 list_del_init(&cur_td->cancelled_td_list);
1025 xhci_giveback_urb_in_irq(xhci, cur_td,
1026 -ESHUTDOWN, "killed");
1028 while (!list_empty(&temp_ep->cancelled_td_list)) {
1029 cur_td = list_first_entry(
1030 &temp_ep->cancelled_td_list,
1033 list_del_init(&cur_td->cancelled_td_list);
1034 xhci_giveback_urb_in_irq(xhci, cur_td,
1035 -ESHUTDOWN, "killed");
1039 spin_unlock_irqrestore(&xhci->lock, flags);
1040 xhci_dbg(xhci, "Calling usb_hc_died()\n");
1041 usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
1042 xhci_dbg(xhci, "xHCI host controller is dead.\n");
1046 * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
1047 * we need to clear the set deq pending flag in the endpoint ring state, so that
1048 * the TD queueing code can ring the doorbell again. We also need to ring the
1049 * endpoint doorbell to restart the ring, but only if there aren't more
1050 * cancellations pending.
1052 static void handle_set_deq_completion(struct xhci_hcd *xhci,
1053 struct xhci_event_cmd *event,
1054 union xhci_trb *trb)
1056 unsigned int slot_id;
1057 unsigned int ep_index;
1058 unsigned int stream_id;
1059 struct xhci_ring *ep_ring;
1060 struct xhci_virt_device *dev;
1061 struct xhci_ep_ctx *ep_ctx;
1062 struct xhci_slot_ctx *slot_ctx;
1064 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
1065 ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
1066 stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2]));
1067 dev = xhci->devs[slot_id];
1069 ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id);
1071 xhci_warn(xhci, "WARN Set TR deq ptr command for "
1072 "freed stream ID %u\n",
1074 /* XXX: Harmless??? */
1075 dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
1079 ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
1080 slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
1082 if (GET_COMP_CODE(le32_to_cpu(event->status)) != COMP_SUCCESS) {
1083 unsigned int ep_state;
1084 unsigned int slot_state;
1086 switch (GET_COMP_CODE(le32_to_cpu(event->status))) {
1088 xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because "
1089 "of stream ID configuration\n");
1091 case COMP_CTX_STATE:
1092 xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due "
1093 "to incorrect slot or ep state.\n");
1094 ep_state = le32_to_cpu(ep_ctx->ep_info);
1095 ep_state &= EP_STATE_MASK;
1096 slot_state = le32_to_cpu(slot_ctx->dev_state);
1097 slot_state = GET_SLOT_STATE(slot_state);
1098 xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
1099 slot_state, ep_state);
1102 xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because "
1103 "slot %u was not enabled.\n", slot_id);
1106 xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown "
1107 "completion code of %u.\n",
1108 GET_COMP_CODE(le32_to_cpu(event->status)));
1111 /* OK what do we do now? The endpoint state is hosed, and we
1112 * should never get to this point if the synchronization between
1113 * queueing, and endpoint state are correct. This might happen
1114 * if the device gets disconnected after we've finished
1115 * cancelling URBs, which might not be an error...
1118 xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
1119 le64_to_cpu(ep_ctx->deq));
1120 if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg,
1121 dev->eps[ep_index].queued_deq_ptr) ==
1122 (le64_to_cpu(ep_ctx->deq) & ~(EP_CTX_CYCLE_MASK))) {
1123 /* Update the ring's dequeue segment and dequeue pointer
1124 * to reflect the new position.
1126 ep_ring->deq_seg = dev->eps[ep_index].queued_deq_seg;
1127 ep_ring->dequeue = dev->eps[ep_index].queued_deq_ptr;
1129 xhci_warn(xhci, "Mismatch between completed Set TR Deq "
1130 "Ptr command & xHCI internal state.\n");
1131 xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n",
1132 dev->eps[ep_index].queued_deq_seg,
1133 dev->eps[ep_index].queued_deq_ptr);
1137 dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
1138 dev->eps[ep_index].queued_deq_seg = NULL;
1139 dev->eps[ep_index].queued_deq_ptr = NULL;
1140 /* Restart any rings with pending URBs */
1141 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1144 static void handle_reset_ep_completion(struct xhci_hcd *xhci,
1145 struct xhci_event_cmd *event,
1146 union xhci_trb *trb)
1149 unsigned int ep_index;
1151 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
1152 ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
1153 /* This command will only fail if the endpoint wasn't halted,
1154 * but we don't care.
1156 xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
1157 GET_COMP_CODE(le32_to_cpu(event->status)));
1159 /* HW with the reset endpoint quirk needs to have a configure endpoint
1160 * command complete before the endpoint can be used. Queue that here
1161 * because the HW can't handle two commands being queued in a row.
1163 if (xhci->quirks & XHCI_RESET_EP_QUIRK) {
1164 xhci_dbg(xhci, "Queueing configure endpoint command\n");
1165 xhci_queue_configure_endpoint(xhci,
1166 xhci->devs[slot_id]->in_ctx->dma, slot_id,
1168 xhci_ring_cmd_db(xhci);
1170 /* Clear our internal halted state */
1171 xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED;
1175 /* Complete the command and detele it from the devcie's command queue.
1177 static void xhci_complete_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
1178 struct xhci_command *command, u32 status)
1180 command->status = status;
1181 list_del(&command->cmd_list);
1182 if (command->completion)
1183 complete(command->completion);
1185 xhci_free_command(xhci, command);
1189 /* Check to see if a command in the device's command queue matches this one.
1190 * Signal the completion or free the command, and return 1. Return 0 if the
1191 * completed command isn't at the head of the command list.
1193 static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
1194 struct xhci_virt_device *virt_dev,
1195 struct xhci_event_cmd *event)
1197 struct xhci_command *command;
1199 if (list_empty(&virt_dev->cmd_list))
1202 command = list_entry(virt_dev->cmd_list.next,
1203 struct xhci_command, cmd_list);
1204 if (xhci->cmd_ring->dequeue != command->command_trb)
1207 xhci_complete_cmd_in_cmd_wait_list(xhci, command,
1208 GET_COMP_CODE(le32_to_cpu(event->status)));
1213 * Finding the command trb need to be cancelled and modifying it to
1214 * NO OP command. And if the command is in device's command wait
1215 * list, finishing and freeing it.
1217 * If we can't find the command trb, we think it had already been
1220 static void xhci_cmd_to_noop(struct xhci_hcd *xhci, struct xhci_cd *cur_cd)
1222 struct xhci_segment *cur_seg;
1223 union xhci_trb *cmd_trb;
1226 if (xhci->cmd_ring->dequeue == xhci->cmd_ring->enqueue)
1229 /* find the current segment of command ring */
1230 cur_seg = find_trb_seg(xhci->cmd_ring->first_seg,
1231 xhci->cmd_ring->dequeue, &cycle_state);
1234 xhci_warn(xhci, "Command ring mismatch, dequeue = %p %llx (dma)\n",
1235 xhci->cmd_ring->dequeue,
1236 (unsigned long long)
1237 xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
1238 xhci->cmd_ring->dequeue));
1239 xhci_debug_ring(xhci, xhci->cmd_ring);
1240 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
1244 /* find the command trb matched by cd from command ring */
1245 for (cmd_trb = xhci->cmd_ring->dequeue;
1246 cmd_trb != xhci->cmd_ring->enqueue;
1247 next_trb(xhci, xhci->cmd_ring, &cur_seg, &cmd_trb)) {
1248 /* If the trb is link trb, continue */
1249 if (TRB_TYPE_LINK_LE32(cmd_trb->generic.field[3]))
1252 if (cur_cd->cmd_trb == cmd_trb) {
1254 /* If the command in device's command list, we should
1255 * finish it and free the command structure.
1257 if (cur_cd->command)
1258 xhci_complete_cmd_in_cmd_wait_list(xhci,
1259 cur_cd->command, COMP_CMD_STOP);
1261 /* get cycle state from the origin command trb */
1262 cycle_state = le32_to_cpu(cmd_trb->generic.field[3])
1265 /* modify the command trb to NO OP command */
1266 cmd_trb->generic.field[0] = 0;
1267 cmd_trb->generic.field[1] = 0;
1268 cmd_trb->generic.field[2] = 0;
1269 cmd_trb->generic.field[3] = cpu_to_le32(
1270 TRB_TYPE(TRB_CMD_NOOP) | cycle_state);
1276 static void xhci_cancel_cmd_in_cd_list(struct xhci_hcd *xhci)
1278 struct xhci_cd *cur_cd, *next_cd;
1280 if (list_empty(&xhci->cancel_cmd_list))
1283 list_for_each_entry_safe(cur_cd, next_cd,
1284 &xhci->cancel_cmd_list, cancel_cmd_list) {
1285 xhci_cmd_to_noop(xhci, cur_cd);
1286 list_del(&cur_cd->cancel_cmd_list);
1292 * traversing the cancel_cmd_list. If the command descriptor according
1293 * to cmd_trb is found, the function free it and return 1, otherwise
1296 static int xhci_search_cmd_trb_in_cd_list(struct xhci_hcd *xhci,
1297 union xhci_trb *cmd_trb)
1299 struct xhci_cd *cur_cd, *next_cd;
1301 if (list_empty(&xhci->cancel_cmd_list))
1304 list_for_each_entry_safe(cur_cd, next_cd,
1305 &xhci->cancel_cmd_list, cancel_cmd_list) {
1306 if (cur_cd->cmd_trb == cmd_trb) {
1307 if (cur_cd->command)
1308 xhci_complete_cmd_in_cmd_wait_list(xhci,
1309 cur_cd->command, COMP_CMD_STOP);
1310 list_del(&cur_cd->cancel_cmd_list);
1320 * If the cmd_trb_comp_code is COMP_CMD_ABORT, we just check whether the
1321 * trb pointed by the command ring dequeue pointer is the trb we want to
1322 * cancel or not. And if the cmd_trb_comp_code is COMP_CMD_STOP, we will
1323 * traverse the cancel_cmd_list to trun the all of the commands according
1324 * to command descriptor to NO-OP trb.
1326 static int handle_stopped_cmd_ring(struct xhci_hcd *xhci,
1327 int cmd_trb_comp_code)
1329 int cur_trb_is_good = 0;
1331 /* Searching the cmd trb pointed by the command ring dequeue
1332 * pointer in command descriptor list. If it is found, free it.
1334 cur_trb_is_good = xhci_search_cmd_trb_in_cd_list(xhci,
1335 xhci->cmd_ring->dequeue);
1337 if (cmd_trb_comp_code == COMP_CMD_ABORT)
1338 xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
1339 else if (cmd_trb_comp_code == COMP_CMD_STOP) {
1340 /* traversing the cancel_cmd_list and canceling
1341 * the command according to command descriptor
1343 xhci_cancel_cmd_in_cd_list(xhci);
1345 xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
1347 * ring command ring doorbell again to restart the
1350 if (xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue)
1351 xhci_ring_cmd_db(xhci);
1353 return cur_trb_is_good;
1356 static void handle_cmd_completion(struct xhci_hcd *xhci,
1357 struct xhci_event_cmd *event)
1359 int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1361 dma_addr_t cmd_dequeue_dma;
1362 struct xhci_input_control_ctx *ctrl_ctx;
1363 struct xhci_virt_device *virt_dev;
1364 unsigned int ep_index;
1365 struct xhci_ring *ep_ring;
1366 unsigned int ep_state;
1368 cmd_dma = le64_to_cpu(event->cmd_trb);
1369 cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
1370 xhci->cmd_ring->dequeue);
1371 /* Is the command ring deq ptr out of sync with the deq seg ptr? */
1372 if (cmd_dequeue_dma == 0) {
1373 xhci->error_bitmask |= 1 << 4;
1376 /* Does the DMA address match our internal dequeue pointer address? */
1377 if (cmd_dma != (u64) cmd_dequeue_dma) {
1378 xhci->error_bitmask |= 1 << 5;
1382 if ((GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_ABORT) ||
1383 (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_STOP)) {
1384 /* If the return value is 0, we think the trb pointed by
1385 * command ring dequeue pointer is a good trb. The good
1386 * trb means we don't want to cancel the trb, but it have
1387 * been stopped by host. So we should handle it normally.
1388 * Otherwise, driver should invoke inc_deq() and return.
1390 if (handle_stopped_cmd_ring(xhci,
1391 GET_COMP_CODE(le32_to_cpu(event->status)))) {
1392 inc_deq(xhci, xhci->cmd_ring, false);
1397 switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])
1398 & TRB_TYPE_BITMASK) {
1399 case TRB_TYPE(TRB_ENABLE_SLOT):
1400 if (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_SUCCESS)
1401 xhci->slot_id = slot_id;
1404 complete(&xhci->addr_dev);
1406 case TRB_TYPE(TRB_DISABLE_SLOT):
1407 if (xhci->devs[slot_id]) {
1408 if (xhci->quirks & XHCI_EP_LIMIT_QUIRK)
1409 /* Delete default control endpoint resources */
1410 xhci_free_device_endpoint_resources(xhci,
1411 xhci->devs[slot_id], true);
1412 xhci_free_virt_device(xhci, slot_id);
1415 case TRB_TYPE(TRB_CONFIG_EP):
1416 virt_dev = xhci->devs[slot_id];
1417 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1420 * Configure endpoint commands can come from the USB core
1421 * configuration or alt setting changes, or because the HW
1422 * needed an extra configure endpoint command after a reset
1423 * endpoint command or streams were being configured.
1424 * If the command was for a halted endpoint, the xHCI driver
1425 * is not waiting on the configure endpoint command.
1427 ctrl_ctx = xhci_get_input_control_ctx(xhci,
1429 /* Input ctx add_flags are the endpoint index plus one */
1430 ep_index = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags)) - 1;
1431 /* A usb_set_interface() call directly after clearing a halted
1432 * condition may race on this quirky hardware. Not worth
1433 * worrying about, since this is prototype hardware. Not sure
1434 * if this will work for streams, but streams support was
1435 * untested on this prototype.
1437 if (xhci->quirks & XHCI_RESET_EP_QUIRK &&
1438 ep_index != (unsigned int) -1 &&
1439 le32_to_cpu(ctrl_ctx->add_flags) - SLOT_FLAG ==
1440 le32_to_cpu(ctrl_ctx->drop_flags)) {
1441 ep_ring = xhci->devs[slot_id]->eps[ep_index].ring;
1442 ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
1443 if (!(ep_state & EP_HALTED))
1444 goto bandwidth_change;
1445 xhci_dbg(xhci, "Completed config ep cmd - "
1446 "last ep index = %d, state = %d\n",
1447 ep_index, ep_state);
1448 /* Clear internal halted state and restart ring(s) */
1449 xhci->devs[slot_id]->eps[ep_index].ep_state &=
1451 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1455 xhci_dbg(xhci, "Completed config ep cmd\n");
1456 xhci->devs[slot_id]->cmd_status =
1457 GET_COMP_CODE(le32_to_cpu(event->status));
1458 complete(&xhci->devs[slot_id]->cmd_completion);
1460 case TRB_TYPE(TRB_EVAL_CONTEXT):
1461 virt_dev = xhci->devs[slot_id];
1462 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1464 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1465 complete(&xhci->devs[slot_id]->cmd_completion);
1467 case TRB_TYPE(TRB_ADDR_DEV):
1468 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1469 complete(&xhci->addr_dev);
1471 case TRB_TYPE(TRB_STOP_RING):
1472 handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue, event);
1474 case TRB_TYPE(TRB_SET_DEQ):
1475 handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
1477 case TRB_TYPE(TRB_CMD_NOOP):
1479 case TRB_TYPE(TRB_RESET_EP):
1480 handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue);
1482 case TRB_TYPE(TRB_RESET_DEV):
1483 xhci_dbg(xhci, "Completed reset device command.\n");
1484 slot_id = TRB_TO_SLOT_ID(
1485 le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
1486 virt_dev = xhci->devs[slot_id];
1488 handle_cmd_in_cmd_wait_list(xhci, virt_dev, event);
1490 xhci_warn(xhci, "Reset device command completion "
1491 "for disabled slot %u\n", slot_id);
1493 case TRB_TYPE(TRB_NEC_GET_FW):
1494 if (!(xhci->quirks & XHCI_NEC_HOST)) {
1495 xhci->error_bitmask |= 1 << 6;
1498 xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
1499 NEC_FW_MAJOR(le32_to_cpu(event->status)),
1500 NEC_FW_MINOR(le32_to_cpu(event->status)));
1503 /* Skip over unknown commands on the event ring */
1504 xhci->error_bitmask |= 1 << 6;
1507 inc_deq(xhci, xhci->cmd_ring, false);
1510 static void handle_vendor_event(struct xhci_hcd *xhci,
1511 union xhci_trb *event)
1515 trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3]));
1516 xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type);
1517 if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST))
1518 handle_cmd_completion(xhci, &event->event_cmd);
1521 /* @port_id: the one-based port ID from the hardware (indexed from array of all
1522 * port registers -- USB 3.0 and USB 2.0).
1524 * Returns a zero-based port number, which is suitable for indexing into each of
1525 * the split roothubs' port arrays and bus state arrays.
1526 * Add one to it in order to call xhci_find_slot_id_by_port.
1528 static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd,
1529 struct xhci_hcd *xhci, u32 port_id)
1532 unsigned int num_similar_speed_ports = 0;
1534 /* port_id from the hardware is 1-based, but port_array[], usb3_ports[],
1535 * and usb2_ports are 0-based indexes. Count the number of similar
1536 * speed ports, up to 1 port before this port.
1538 for (i = 0; i < (port_id - 1); i++) {
1539 u8 port_speed = xhci->port_array[i];
1542 * Skip ports that don't have known speeds, or have duplicate
1543 * Extended Capabilities port speed entries.
1545 if (port_speed == 0 || port_speed == DUPLICATE_ENTRY)
1549 * USB 3.0 ports are always under a USB 3.0 hub. USB 2.0 and
1550 * 1.1 ports are under the USB 2.0 hub. If the port speed
1551 * matches the device speed, it's a similar speed port.
1553 if ((port_speed == 0x03) == (hcd->speed == HCD_USB3))
1554 num_similar_speed_ports++;
1556 return num_similar_speed_ports;
1559 static void handle_port_status(struct xhci_hcd *xhci,
1560 union xhci_trb *event)
1562 struct usb_hcd *hcd;
1567 unsigned int faked_port_index;
1569 struct xhci_bus_state *bus_state;
1570 __le32 __iomem **port_array;
1571 bool bogus_port_status = false;
1573 /* Port status change events always have a successful completion code */
1574 if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) {
1575 xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
1576 xhci->error_bitmask |= 1 << 8;
1578 port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0]));
1579 xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
1581 max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
1582 if ((port_id <= 0) || (port_id > max_ports)) {
1583 xhci_warn(xhci, "Invalid port id %d\n", port_id);
1584 bogus_port_status = true;
1588 /* Figure out which usb_hcd this port is attached to:
1589 * is it a USB 3.0 port or a USB 2.0/1.1 port?
1591 major_revision = xhci->port_array[port_id - 1];
1592 if (major_revision == 0) {
1593 xhci_warn(xhci, "Event for port %u not in "
1594 "Extended Capabilities, ignoring.\n",
1596 bogus_port_status = true;
1599 if (major_revision == DUPLICATE_ENTRY) {
1600 xhci_warn(xhci, "Event for port %u duplicated in"
1601 "Extended Capabilities, ignoring.\n",
1603 bogus_port_status = true;
1608 * Hardware port IDs reported by a Port Status Change Event include USB
1609 * 3.0 and USB 2.0 ports. We want to check if the port has reported a
1610 * resume event, but we first need to translate the hardware port ID
1611 * into the index into the ports on the correct split roothub, and the
1612 * correct bus_state structure.
1614 /* Find the right roothub. */
1615 hcd = xhci_to_hcd(xhci);
1616 if ((major_revision == 0x03) != (hcd->speed == HCD_USB3))
1617 hcd = xhci->shared_hcd;
1618 bus_state = &xhci->bus_state[hcd_index(hcd)];
1619 if (hcd->speed == HCD_USB3)
1620 port_array = xhci->usb3_ports;
1622 port_array = xhci->usb2_ports;
1623 /* Find the faked port hub number */
1624 faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci,
1627 temp = xhci_readl(xhci, port_array[faked_port_index]);
1628 if (hcd->state == HC_STATE_SUSPENDED) {
1629 xhci_dbg(xhci, "resume root hub\n");
1630 usb_hcd_resume_root_hub(hcd);
1633 if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) {
1634 xhci_dbg(xhci, "port resume event for port %d\n", port_id);
1636 temp1 = xhci_readl(xhci, &xhci->op_regs->command);
1637 if (!(temp1 & CMD_RUN)) {
1638 xhci_warn(xhci, "xHC is not running.\n");
1642 if (DEV_SUPERSPEED(temp)) {
1643 xhci_dbg(xhci, "resume SS port %d\n", port_id);
1644 xhci_set_link_state(xhci, port_array, faked_port_index,
1646 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1647 faked_port_index + 1);
1649 xhci_dbg(xhci, "slot_id is zero\n");
1652 xhci_ring_device(xhci, slot_id);
1653 xhci_dbg(xhci, "resume SS port %d finished\n", port_id);
1654 /* Clear PORT_PLC */
1655 xhci_test_and_clear_bit(xhci, port_array,
1656 faked_port_index, PORT_PLC);
1658 xhci_dbg(xhci, "resume HS port %d\n", port_id);
1659 bus_state->resume_done[faked_port_index] = jiffies +
1660 msecs_to_jiffies(20);
1661 mod_timer(&hcd->rh_timer,
1662 bus_state->resume_done[faked_port_index]);
1663 /* Do the rest in GetPortStatus */
1667 if (hcd->speed != HCD_USB3)
1668 xhci_test_and_clear_bit(xhci, port_array, faked_port_index,
1672 /* Update event ring dequeue pointer before dropping the lock */
1673 inc_deq(xhci, xhci->event_ring, true);
1675 /* Don't make the USB core poll the roothub if we got a bad port status
1676 * change event. Besides, at that point we can't tell which roothub
1677 * (USB 2.0 or USB 3.0) to kick.
1679 if (bogus_port_status)
1683 * xHCI port-status-change events occur when the "or" of all the
1684 * status-change bits in the portsc register changes from 0 to 1.
1685 * New status changes won't cause an event if any other change
1686 * bits are still set. When an event occurs, switch over to
1687 * polling to avoid losing status changes.
1689 xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
1690 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1691 spin_unlock(&xhci->lock);
1692 /* Pass this up to the core */
1693 usb_hcd_poll_rh_status(hcd);
1694 spin_lock(&xhci->lock);
1698 * This TD is defined by the TRBs starting at start_trb in start_seg and ending
1699 * at end_trb, which may be in another segment. If the suspect DMA address is a
1700 * TRB in this TD, this function returns that TRB's segment. Otherwise it
1703 struct xhci_segment *trb_in_td(struct xhci_segment *start_seg,
1704 union xhci_trb *start_trb,
1705 union xhci_trb *end_trb,
1706 dma_addr_t suspect_dma)
1708 dma_addr_t start_dma;
1709 dma_addr_t end_seg_dma;
1710 dma_addr_t end_trb_dma;
1711 struct xhci_segment *cur_seg;
1713 start_dma = xhci_trb_virt_to_dma(start_seg, start_trb);
1714 cur_seg = start_seg;
1719 /* We may get an event for a Link TRB in the middle of a TD */
1720 end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
1721 &cur_seg->trbs[TRBS_PER_SEGMENT - 1]);
1722 /* If the end TRB isn't in this segment, this is set to 0 */
1723 end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
1725 if (end_trb_dma > 0) {
1726 /* The end TRB is in this segment, so suspect should be here */
1727 if (start_dma <= end_trb_dma) {
1728 if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma)
1731 /* Case for one segment with
1732 * a TD wrapped around to the top
1734 if ((suspect_dma >= start_dma &&
1735 suspect_dma <= end_seg_dma) ||
1736 (suspect_dma >= cur_seg->dma &&
1737 suspect_dma <= end_trb_dma))
1742 /* Might still be somewhere in this segment */
1743 if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma)
1746 cur_seg = cur_seg->next;
1747 start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
1748 } while (cur_seg != start_seg);
1753 static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
1754 unsigned int slot_id, unsigned int ep_index,
1755 unsigned int stream_id,
1756 struct xhci_td *td, union xhci_trb *event_trb)
1758 struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
1759 ep->ep_state |= EP_HALTED;
1760 ep->stopped_td = td;
1761 ep->stopped_stream = stream_id;
1763 xhci_queue_reset_ep(xhci, slot_id, ep_index);
1764 xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index);
1766 ep->stopped_td = NULL;
1767 ep->stopped_stream = 0;
1769 xhci_ring_cmd_db(xhci);
1772 /* Check if an error has halted the endpoint ring. The class driver will
1773 * cleanup the halt for a non-default control endpoint if we indicate a stall.
1774 * However, a babble and other errors also halt the endpoint ring, and the class
1775 * driver won't clear the halt in that case, so we need to issue a Set Transfer
1776 * Ring Dequeue Pointer command manually.
1778 static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
1779 struct xhci_ep_ctx *ep_ctx,
1780 unsigned int trb_comp_code)
1782 /* TRB completion codes that may require a manual halt cleanup */
1783 if (trb_comp_code == COMP_TX_ERR ||
1784 trb_comp_code == COMP_BABBLE ||
1785 trb_comp_code == COMP_SPLIT_ERR)
1786 /* The 0.96 spec says a babbling control endpoint
1787 * is not halted. The 0.96 spec says it is. Some HW
1788 * claims to be 0.95 compliant, but it halts the control
1789 * endpoint anyway. Check if a babble halted the
1792 if ((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
1793 cpu_to_le32(EP_STATE_HALTED))
1799 int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code)
1801 if (trb_comp_code >= 224 && trb_comp_code <= 255) {
1802 /* Vendor defined "informational" completion code,
1803 * treat as not-an-error.
1805 xhci_dbg(xhci, "Vendor defined info completion code %u\n",
1807 xhci_dbg(xhci, "Treating code as success.\n");
1814 * Finish the td processing, remove the td from td list;
1815 * Return 1 if the urb can be given back.
1817 static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td,
1818 union xhci_trb *event_trb, struct xhci_transfer_event *event,
1819 struct xhci_virt_ep *ep, int *status, bool skip)
1821 struct xhci_virt_device *xdev;
1822 struct xhci_ring *ep_ring;
1823 unsigned int slot_id;
1825 struct urb *urb = NULL;
1826 struct xhci_ep_ctx *ep_ctx;
1828 struct urb_priv *urb_priv;
1831 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1832 xdev = xhci->devs[slot_id];
1833 ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1834 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1835 ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1836 trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1841 if (trb_comp_code == COMP_STOP_INVAL ||
1842 trb_comp_code == COMP_STOP) {
1843 /* The Endpoint Stop Command completion will take care of any
1844 * stopped TDs. A stopped TD may be restarted, so don't update
1845 * the ring dequeue pointer or take this TD off any lists yet.
1847 ep->stopped_td = td;
1850 if (trb_comp_code == COMP_STALL ||
1851 xhci_requires_manual_halt_cleanup(xhci, ep_ctx,
1853 /* Issue a reset endpoint command to clear the host side
1854 * halt, followed by a set dequeue command to move the
1855 * dequeue pointer past the TD.
1856 * The class driver clears the device side halt later.
1858 xhci_cleanup_halted_endpoint(xhci,
1859 slot_id, ep_index, ep_ring->stream_id,
1862 /* Update ring dequeue pointer */
1863 while (ep_ring->dequeue != td->last_trb)
1864 inc_deq(xhci, ep_ring, false);
1865 inc_deq(xhci, ep_ring, false);
1869 /* Clean up the endpoint's TD list */
1871 urb_priv = urb->hcpriv;
1873 /* Do one last check of the actual transfer length.
1874 * If the host controller said we transferred more data than
1875 * the buffer length, urb->actual_length will be a very big
1876 * number (since it's unsigned). Play it safe and say we didn't
1877 * transfer anything.
1879 if (urb->actual_length > urb->transfer_buffer_length) {
1880 xhci_warn(xhci, "URB transfer length is wrong, "
1881 "xHC issue? req. len = %u, "
1883 urb->transfer_buffer_length,
1884 urb->actual_length);
1885 urb->actual_length = 0;
1886 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1887 *status = -EREMOTEIO;
1891 list_del_init(&td->td_list);
1892 /* Was this TD slated to be cancelled but completed anyway? */
1893 if (!list_empty(&td->cancelled_td_list))
1894 list_del_init(&td->cancelled_td_list);
1897 /* Giveback the urb when all the tds are completed */
1898 if (urb_priv->td_cnt == urb_priv->length) {
1900 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1901 xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
1902 if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs
1904 if (xhci->quirks & XHCI_AMD_PLL_FIX)
1905 usb_amd_quirk_pll_enable();
1915 * Process control tds, update urb status and actual_length.
1917 static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td,
1918 union xhci_trb *event_trb, struct xhci_transfer_event *event,
1919 struct xhci_virt_ep *ep, int *status)
1921 struct xhci_virt_device *xdev;
1922 struct xhci_ring *ep_ring;
1923 unsigned int slot_id;
1925 struct xhci_ep_ctx *ep_ctx;
1928 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1929 xdev = xhci->devs[slot_id];
1930 ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1931 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1932 ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1933 trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1935 xhci_debug_trb(xhci, xhci->event_ring->dequeue);
1936 switch (trb_comp_code) {
1938 if (event_trb == ep_ring->dequeue) {
1939 xhci_warn(xhci, "WARN: Success on ctrl setup TRB "
1940 "without IOC set??\n");
1941 *status = -ESHUTDOWN;
1942 } else if (event_trb != td->last_trb) {
1943 xhci_warn(xhci, "WARN: Success on ctrl data TRB "
1944 "without IOC set??\n");
1945 *status = -ESHUTDOWN;
1951 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1952 *status = -EREMOTEIO;
1956 case COMP_STOP_INVAL:
1958 return finish_td(xhci, td, event_trb, event, ep, status, false);
1960 if (!xhci_requires_manual_halt_cleanup(xhci,
1961 ep_ctx, trb_comp_code))
1963 xhci_dbg(xhci, "TRB error code %u, "
1964 "halted endpoint index = %u\n",
1965 trb_comp_code, ep_index);
1966 /* else fall through */
1968 /* Did we transfer part of the data (middle) phase? */
1969 if (event_trb != ep_ring->dequeue &&
1970 event_trb != td->last_trb)
1971 td->urb->actual_length =
1972 td->urb->transfer_buffer_length -
1973 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
1975 td->urb->actual_length = 0;
1977 return finish_td(xhci, td, event_trb, event, ep, status, false);
1980 * Did we transfer any data, despite the errors that might have
1981 * happened? I.e. did we get past the setup stage?
1983 if (event_trb != ep_ring->dequeue) {
1984 /* The event was for the status stage */
1985 if (event_trb == td->last_trb) {
1986 if (td->urb_length_set) {
1987 /* Don't overwrite a previously set error code
1989 if ((*status == -EINPROGRESS || *status == 0) &&
1990 (td->urb->transfer_flags
1991 & URB_SHORT_NOT_OK))
1992 /* Did we already see a short data
1994 *status = -EREMOTEIO;
1996 td->urb->actual_length =
1997 td->urb->transfer_buffer_length;
2001 * Maybe the event was for the data stage? If so, update
2002 * already the actual_length of the URB and flag it as
2003 * set, so that it is not overwritten in the event for
2006 td->urb_length_set = true;
2007 td->urb->actual_length =
2008 td->urb->transfer_buffer_length -
2009 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2010 xhci_dbg(xhci, "Waiting for status "
2016 return finish_td(xhci, td, event_trb, event, ep, status, false);
2020 * Process isochronous tds, update urb packet status and actual_length.
2022 static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
2023 union xhci_trb *event_trb, struct xhci_transfer_event *event,
2024 struct xhci_virt_ep *ep, int *status)
2026 struct xhci_ring *ep_ring;
2027 struct urb_priv *urb_priv;
2030 union xhci_trb *cur_trb;
2031 struct xhci_segment *cur_seg;
2032 struct usb_iso_packet_descriptor *frame;
2034 bool skip_td = false;
2036 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2037 trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2038 urb_priv = td->urb->hcpriv;
2039 idx = urb_priv->td_cnt;
2040 frame = &td->urb->iso_frame_desc[idx];
2042 /* handle completion code */
2043 switch (trb_comp_code) {
2045 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) {
2049 if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
2050 trb_comp_code = COMP_SHORT_TX;
2052 frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ?
2056 frame->status = -ECOMM;
2059 case COMP_BUFF_OVER:
2061 frame->status = -EOVERFLOW;
2066 frame->status = -EPROTO;
2070 frame->status = -EPROTO;
2071 if (event_trb != td->last_trb)
2076 case COMP_STOP_INVAL:
2083 if (trb_comp_code == COMP_SUCCESS || skip_td) {
2084 frame->actual_length = frame->length;
2085 td->urb->actual_length += frame->length;
2087 for (cur_trb = ep_ring->dequeue,
2088 cur_seg = ep_ring->deq_seg; cur_trb != event_trb;
2089 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
2090 if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
2091 !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
2092 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
2094 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
2095 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2097 if (trb_comp_code != COMP_STOP_INVAL) {
2098 frame->actual_length = len;
2099 td->urb->actual_length += len;
2103 return finish_td(xhci, td, event_trb, event, ep, status, false);
2106 static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
2107 struct xhci_transfer_event *event,
2108 struct xhci_virt_ep *ep, int *status)
2110 struct xhci_ring *ep_ring;
2111 struct urb_priv *urb_priv;
2112 struct usb_iso_packet_descriptor *frame;
2115 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2116 urb_priv = td->urb->hcpriv;
2117 idx = urb_priv->td_cnt;
2118 frame = &td->urb->iso_frame_desc[idx];
2120 /* The transfer is partly done. */
2121 frame->status = -EXDEV;
2123 /* calc actual length */
2124 frame->actual_length = 0;
2126 /* Update ring dequeue pointer */
2127 while (ep_ring->dequeue != td->last_trb)
2128 inc_deq(xhci, ep_ring, false);
2129 inc_deq(xhci, ep_ring, false);
2131 return finish_td(xhci, td, NULL, event, ep, status, true);
2135 * Process bulk and interrupt tds, update urb status and actual_length.
2137 static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
2138 union xhci_trb *event_trb, struct xhci_transfer_event *event,
2139 struct xhci_virt_ep *ep, int *status)
2141 struct xhci_ring *ep_ring;
2142 union xhci_trb *cur_trb;
2143 struct xhci_segment *cur_seg;
2146 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2147 trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2149 switch (trb_comp_code) {
2151 /* Double check that the HW transferred everything. */
2152 if (event_trb != td->last_trb ||
2153 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
2154 xhci_warn(xhci, "WARN Successful completion "
2156 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2157 *status = -EREMOTEIO;
2160 if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
2161 trb_comp_code = COMP_SHORT_TX;
2167 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2168 *status = -EREMOTEIO;
2173 /* Others already handled above */
2176 if (trb_comp_code == COMP_SHORT_TX)
2177 xhci_dbg(xhci, "ep %#x - asked for %d bytes, "
2178 "%d bytes untransferred\n",
2179 td->urb->ep->desc.bEndpointAddress,
2180 td->urb->transfer_buffer_length,
2181 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)));
2182 /* Fast path - was this the last TRB in the TD for this URB? */
2183 if (event_trb == td->last_trb) {
2184 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
2185 td->urb->actual_length =
2186 td->urb->transfer_buffer_length -
2187 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2188 if (td->urb->transfer_buffer_length <
2189 td->urb->actual_length) {
2190 xhci_warn(xhci, "HC gave bad length "
2191 "of %d bytes left\n",
2192 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)));
2193 td->urb->actual_length = 0;
2194 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2195 *status = -EREMOTEIO;
2199 /* Don't overwrite a previously set error code */
2200 if (*status == -EINPROGRESS) {
2201 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2202 *status = -EREMOTEIO;
2207 td->urb->actual_length =
2208 td->urb->transfer_buffer_length;
2209 /* Ignore a short packet completion if the
2210 * untransferred length was zero.
2212 if (*status == -EREMOTEIO)
2216 /* Slow path - walk the list, starting from the dequeue
2217 * pointer, to get the actual length transferred.
2219 td->urb->actual_length = 0;
2220 for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
2221 cur_trb != event_trb;
2222 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
2223 if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
2224 !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
2225 td->urb->actual_length +=
2226 TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
2228 /* If the ring didn't stop on a Link or No-op TRB, add
2229 * in the actual bytes transferred from the Normal TRB
2231 if (trb_comp_code != COMP_STOP_INVAL)
2232 td->urb->actual_length +=
2233 TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
2234 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2237 return finish_td(xhci, td, event_trb, event, ep, status, false);
2241 * If this function returns an error condition, it means it got a Transfer
2242 * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
2243 * At this point, the host controller is probably hosed and should be reset.
2245 static int handle_tx_event(struct xhci_hcd *xhci,
2246 struct xhci_transfer_event *event)
2248 struct xhci_virt_device *xdev;
2249 struct xhci_virt_ep *ep;
2250 struct xhci_ring *ep_ring;
2251 unsigned int slot_id;
2253 struct xhci_td *td = NULL;
2254 dma_addr_t event_dma;
2255 struct xhci_segment *event_seg;
2256 union xhci_trb *event_trb;
2257 struct urb *urb = NULL;
2258 int status = -EINPROGRESS;
2259 struct urb_priv *urb_priv;
2260 struct xhci_ep_ctx *ep_ctx;
2261 struct list_head *tmp;
2265 bool handling_skipped_tds = false;
2267 slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
2268 xdev = xhci->devs[slot_id];
2270 xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
2274 /* Endpoint ID is 1 based, our index is zero based */
2275 ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
2276 ep = &xdev->eps[ep_index];
2277 ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2278 ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
2280 (le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) ==
2281 EP_STATE_DISABLED) {
2282 xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
2283 "or incorrect stream ring\n");
2287 /* Count current td numbers if ep->skip is set */
2289 list_for_each(tmp, &ep_ring->td_list)
2293 event_dma = le64_to_cpu(event->buffer);
2294 trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2295 /* Look for common error cases */
2296 switch (trb_comp_code) {
2297 /* Skip codes that require special handling depending on
2301 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0)
2303 if (xhci->quirks & XHCI_TRUST_TX_LENGTH)
2304 trb_comp_code = COMP_SHORT_TX;
2306 xhci_warn(xhci, "WARN Successful completion on short TX: "
2307 "needs XHCI_TRUST_TX_LENGTH quirk?\n");
2311 xhci_dbg(xhci, "Stopped on Transfer TRB\n");
2313 case COMP_STOP_INVAL:
2314 xhci_dbg(xhci, "Stopped on No-op or Link TRB\n");
2317 xhci_dbg(xhci, "Stalled endpoint\n");
2318 ep->ep_state |= EP_HALTED;
2322 xhci_warn(xhci, "WARN: TRB error on endpoint\n");
2325 case COMP_SPLIT_ERR:
2327 xhci_dbg(xhci, "Transfer error on endpoint\n");
2331 xhci_dbg(xhci, "Babble error on endpoint\n");
2332 status = -EOVERFLOW;
2335 xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n");
2339 xhci_warn(xhci, "WARN: bandwidth overrun event on endpoint\n");
2341 case COMP_BUFF_OVER:
2342 xhci_warn(xhci, "WARN: buffer overrun event on endpoint\n");
2346 * When the Isoch ring is empty, the xHC will generate
2347 * a Ring Overrun Event for IN Isoch endpoint or Ring
2348 * Underrun Event for OUT Isoch endpoint.
2350 xhci_dbg(xhci, "underrun event on endpoint\n");
2351 if (!list_empty(&ep_ring->td_list))
2352 xhci_dbg(xhci, "Underrun Event for slot %d ep %d "
2353 "still with TDs queued?\n",
2354 TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2358 xhci_dbg(xhci, "overrun event on endpoint\n");
2359 if (!list_empty(&ep_ring->td_list))
2360 xhci_dbg(xhci, "Overrun Event for slot %d ep %d "
2361 "still with TDs queued?\n",
2362 TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2366 xhci_warn(xhci, "WARN: detect an incompatible device");
2369 case COMP_MISSED_INT:
2371 * When encounter missed service error, one or more isoc tds
2372 * may be missed by xHC.
2373 * Set skip flag of the ep_ring; Complete the missed tds as
2374 * short transfer when process the ep_ring next time.
2377 xhci_dbg(xhci, "Miss service interval error, set skip flag\n");
2381 xhci_dbg(xhci, "No Ping response error, Skip one Isoc TD\n");
2384 if (xhci_is_vendor_info_code(xhci, trb_comp_code)) {
2388 xhci_warn(xhci, "ERROR Unknown event condition, HC probably "
2394 /* This TRB should be in the TD at the head of this ring's
2397 if (list_empty(&ep_ring->td_list)) {
2399 * A stopped endpoint may generate an extra completion
2400 * event if the device was suspended. Don't print
2403 if (!(trb_comp_code == COMP_STOP ||
2404 trb_comp_code == COMP_STOP_INVAL)) {
2405 xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n",
2406 TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2408 xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
2409 (le32_to_cpu(event->flags) &
2410 TRB_TYPE_BITMASK)>>10);
2411 xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
2415 xhci_dbg(xhci, "td_list is empty while skip "
2416 "flag set. Clear skip flag.\n");
2422 /* We've skipped all the TDs on the ep ring when ep->skip set */
2423 if (ep->skip && td_num == 0) {
2425 xhci_dbg(xhci, "All tds on the ep_ring skipped. "
2426 "Clear skip flag.\n");
2431 td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
2435 /* Is this a TRB in the currently executing TD? */
2436 event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
2437 td->last_trb, event_dma);
2440 * Skip the Force Stopped Event. The event_trb(event_dma) of FSE
2441 * is not in the current TD pointed by ep_ring->dequeue because
2442 * that the hardware dequeue pointer still at the previous TRB
2443 * of the current TD. The previous TRB maybe a Link TD or the
2444 * last TRB of the previous TD. The command completion handle
2445 * will take care the rest.
2447 if (!event_seg && (trb_comp_code == COMP_STOP ||
2448 trb_comp_code == COMP_STOP_INVAL)) {
2455 !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) {
2456 /* Some host controllers give a spurious
2457 * successful event after a short transfer.
2460 if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) &&
2461 ep_ring->last_td_was_short) {
2462 ep_ring->last_td_was_short = false;
2466 /* HC is busted, give up! */
2468 "ERROR Transfer event TRB DMA ptr not "
2469 "part of current TD\n");
2473 ret = skip_isoc_td(xhci, td, event, ep, &status);
2476 if (trb_comp_code == COMP_SHORT_TX)
2477 ep_ring->last_td_was_short = true;
2479 ep_ring->last_td_was_short = false;
2482 xhci_dbg(xhci, "Found td. Clear skip flag.\n");
2486 event_trb = &event_seg->trbs[(event_dma - event_seg->dma) /
2487 sizeof(*event_trb)];
2489 * No-op TRB should not trigger interrupts.
2490 * If event_trb is a no-op TRB, it means the
2491 * corresponding TD has been cancelled. Just ignore
2494 if (TRB_TYPE_NOOP_LE32(event_trb->generic.field[3])) {
2496 "event_trb is a no-op TRB. Skip it\n");
2500 /* Now update the urb's actual_length and give back to
2503 if (usb_endpoint_xfer_control(&td->urb->ep->desc))
2504 ret = process_ctrl_td(xhci, td, event_trb, event, ep,
2506 else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
2507 ret = process_isoc_td(xhci, td, event_trb, event, ep,
2510 ret = process_bulk_intr_td(xhci, td, event_trb, event,
2516 handling_skipped_tds = ep->skip &&
2517 trb_comp_code != COMP_MISSED_INT &&
2518 trb_comp_code != COMP_PING_ERR;
2521 * Do not update event ring dequeue pointer if we're in a loop
2522 * processing missed tds.
2524 if (!handling_skipped_tds)
2525 inc_deq(xhci, xhci->event_ring, true);
2529 urb_priv = urb->hcpriv;
2531 xhci_urb_free_priv(xhci, urb_priv);
2533 usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb);
2534 if ((urb->actual_length != urb->transfer_buffer_length &&
2535 (urb->transfer_flags &
2536 URB_SHORT_NOT_OK)) ||
2538 !usb_endpoint_xfer_isoc(&urb->ep->desc)))
2539 xhci_dbg(xhci, "Giveback URB %p, len = %d, "
2540 "expected = %x, status = %d\n",
2541 urb, urb->actual_length,
2542 urb->transfer_buffer_length,
2544 spin_unlock(&xhci->lock);
2545 /* EHCI, UHCI, and OHCI always unconditionally set the
2546 * urb->status of an isochronous endpoint to 0.
2548 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
2550 usb_hcd_giveback_urb(bus_to_hcd(urb->dev->bus), urb, status);
2551 spin_lock(&xhci->lock);
2555 * If ep->skip is set, it means there are missed tds on the
2556 * endpoint ring need to take care of.
2557 * Process them as short transfer until reach the td pointed by
2560 } while (handling_skipped_tds);
2566 * This function handles all OS-owned events on the event ring. It may drop
2567 * xhci->lock between event processing (e.g. to pass up port status changes).
2568 * Returns >0 for "possibly more events to process" (caller should call again),
2569 * otherwise 0 if done. In future, <0 returns should indicate error code.
2571 static int xhci_handle_event(struct xhci_hcd *xhci)
2573 union xhci_trb *event;
2574 int update_ptrs = 1;
2577 if (!xhci->event_ring || !xhci->event_ring->dequeue) {
2578 xhci->error_bitmask |= 1 << 1;
2582 event = xhci->event_ring->dequeue;
2583 /* Does the HC or OS own the TRB? */
2584 if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) !=
2585 xhci->event_ring->cycle_state) {
2586 xhci->error_bitmask |= 1 << 2;
2591 * Barrier between reading the TRB_CYCLE (valid) flag above and any
2592 * speculative reads of the event's flags/data below.
2595 /* FIXME: Handle more event types. */
2596 switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) {
2597 case TRB_TYPE(TRB_COMPLETION):
2598 handle_cmd_completion(xhci, &event->event_cmd);
2600 case TRB_TYPE(TRB_PORT_STATUS):
2601 handle_port_status(xhci, event);
2604 case TRB_TYPE(TRB_TRANSFER):
2605 ret = handle_tx_event(xhci, &event->trans_event);
2607 xhci->error_bitmask |= 1 << 9;
2612 if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >=
2614 handle_vendor_event(xhci, event);
2616 xhci->error_bitmask |= 1 << 3;
2618 /* Any of the above functions may drop and re-acquire the lock, so check
2619 * to make sure a watchdog timer didn't mark the host as non-responsive.
2621 if (xhci->xhc_state & XHCI_STATE_DYING) {
2622 xhci_dbg(xhci, "xHCI host dying, returning from "
2623 "event handler.\n");
2628 /* Update SW event ring dequeue pointer */
2629 inc_deq(xhci, xhci->event_ring, true);
2631 /* Are there more items on the event ring? Caller will call us again to
2638 * xHCI spec says we can get an interrupt, and if the HC has an error condition,
2639 * we might get bad data out of the event ring. Section 4.10.2.7 has a list of
2640 * indicators of an event TRB error, but we check the status *first* to be safe.
2642 irqreturn_t xhci_irq(struct usb_hcd *hcd)
2644 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2645 union xhci_trb *trb;
2646 union xhci_trb *event_ring_deq;
2647 irqreturn_t ret = IRQ_NONE;
2652 spin_lock(&xhci->lock);
2653 trb = xhci->event_ring->dequeue;
2654 /* Check if the xHC generated the interrupt, or the irq is shared */
2655 status = xhci_readl(xhci, &xhci->op_regs->status);
2656 if (status == 0xffffffff) {
2661 if (!(status & STS_EINT))
2664 if (status & STS_FATAL) {
2665 xhci_warn(xhci, "WARNING: Host System Error\n");
2672 * Clear the op reg interrupt status first,
2673 * so we can receive interrupts from other MSI-X interrupters.
2674 * Write 1 to clear the interrupt status.
2677 xhci_writel(xhci, status, &xhci->op_regs->status);
2678 /* FIXME when MSI-X is supported and there are multiple vectors */
2679 /* Clear the MSI-X event interrupt status */
2681 if (hcd->irq != -1) {
2683 /* Acknowledge the PCI interrupt */
2684 irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
2685 irq_pending |= IMAN_IP;
2686 xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending);
2689 if (xhci->xhc_state & XHCI_STATE_DYING) {
2690 xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
2691 "Shouldn't IRQs be disabled?\n");
2692 /* Clear the event handler busy flag (RW1C);
2693 * the event ring should be empty.
2695 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2696 xhci_write_64(xhci, temp_64 | ERST_EHB,
2697 &xhci->ir_set->erst_dequeue);
2702 event_ring_deq = xhci->event_ring->dequeue;
2703 /* FIXME this should be a delayed service routine
2704 * that clears the EHB.
2706 while (xhci_handle_event(xhci) > 0) {}
2708 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2709 /* If necessary, update the HW's version of the event ring deq ptr. */
2710 if (event_ring_deq != xhci->event_ring->dequeue) {
2711 deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
2712 xhci->event_ring->dequeue);
2714 xhci_warn(xhci, "WARN something wrong with SW event "
2715 "ring dequeue ptr.\n");
2716 /* Update HC event ring dequeue pointer */
2717 temp_64 &= ERST_PTR_MASK;
2718 temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK);
2721 /* Clear the event handler busy flag (RW1C); event ring is empty. */
2722 temp_64 |= ERST_EHB;
2723 xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue);
2727 spin_unlock(&xhci->lock);
2732 irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
2735 struct xhci_hcd *xhci;
2737 xhci = hcd_to_xhci(hcd);
2738 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
2739 if (xhci->shared_hcd)
2740 set_bit(HCD_FLAG_SAW_IRQ, &xhci->shared_hcd->flags);
2742 ret = xhci_irq(hcd);
2747 /**** Endpoint Ring Operations ****/
2750 * Generic function for queueing a TRB on a ring.
2751 * The caller must have checked to make sure there's room on the ring.
2753 * @more_trbs_coming: Will you enqueue more TRBs before calling
2754 * prepare_transfer()?
2756 static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
2757 bool consumer, bool more_trbs_coming, bool isoc,
2758 u32 field1, u32 field2, u32 field3, u32 field4)
2760 struct xhci_generic_trb *trb;
2762 trb = &ring->enqueue->generic;
2763 trb->field[0] = cpu_to_le32(field1);
2764 trb->field[1] = cpu_to_le32(field2);
2765 trb->field[2] = cpu_to_le32(field3);
2766 trb->field[3] = cpu_to_le32(field4);
2767 inc_enq(xhci, ring, consumer, more_trbs_coming, isoc);
2771 * Does various checks on the endpoint ring, and makes it ready to queue num_trbs.
2772 * FIXME allocate segments if the ring is full.
2774 static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
2775 u32 ep_state, unsigned int num_trbs, bool isoc, gfp_t mem_flags)
2777 /* Make sure the endpoint has been added to xHC schedule */
2779 case EP_STATE_DISABLED:
2781 * USB core changed config/interfaces without notifying us,
2782 * or hardware is reporting the wrong state.
2784 xhci_warn(xhci, "WARN urb submitted to disabled ep\n");
2786 case EP_STATE_ERROR:
2787 xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n");
2788 /* FIXME event handling code for error needs to clear it */
2789 /* XXX not sure if this should be -ENOENT or not */
2791 case EP_STATE_HALTED:
2792 xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n");
2793 case EP_STATE_STOPPED:
2794 case EP_STATE_RUNNING:
2797 xhci_err(xhci, "ERROR unknown endpoint state for ep\n");
2799 * FIXME issue Configure Endpoint command to try to get the HC
2800 * back into a known state.
2804 if (!room_on_ring(xhci, ep_ring, num_trbs)) {
2805 /* FIXME allocate more room */
2806 xhci_err(xhci, "ERROR no room on ep ring\n");
2810 if (enqueue_is_link_trb(ep_ring)) {
2811 struct xhci_ring *ring = ep_ring;
2812 union xhci_trb *next;
2814 next = ring->enqueue;
2816 while (last_trb(xhci, ring, ring->enq_seg, next)) {
2817 /* If we're not dealing with 0.95 hardware or isoc rings
2818 * on AMD 0.96 host, clear the chain bit.
2820 if (!xhci_link_trb_quirk(xhci) && !(isoc &&
2821 (xhci->quirks & XHCI_AMD_0x96_HOST)))
2822 next->link.control &= cpu_to_le32(~TRB_CHAIN);
2824 next->link.control |= cpu_to_le32(TRB_CHAIN);
2827 next->link.control ^= cpu_to_le32(TRB_CYCLE);
2829 /* Toggle the cycle bit after the last ring segment. */
2830 if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
2831 ring->cycle_state = (ring->cycle_state ? 0 : 1);
2832 if (!in_interrupt()) {
2833 xhci_dbg(xhci, "queue_trb: Toggle cycle "
2834 "state for ring %p = %i\n",
2835 ring, (unsigned int)ring->cycle_state);
2838 ring->enq_seg = ring->enq_seg->next;
2839 ring->enqueue = ring->enq_seg->trbs;
2840 next = ring->enqueue;
2847 static int prepare_transfer(struct xhci_hcd *xhci,
2848 struct xhci_virt_device *xdev,
2849 unsigned int ep_index,
2850 unsigned int stream_id,
2851 unsigned int num_trbs,
2853 unsigned int td_index,
2858 struct urb_priv *urb_priv;
2860 struct xhci_ring *ep_ring;
2861 struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
2863 ep_ring = xhci_stream_id_to_ring(xdev, ep_index, stream_id);
2865 xhci_dbg(xhci, "Can't prepare ring for bad stream ID %u\n",
2870 ret = prepare_ring(xhci, ep_ring,
2871 le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK,
2872 num_trbs, isoc, mem_flags);
2876 urb_priv = urb->hcpriv;
2877 td = urb_priv->td[td_index];
2879 INIT_LIST_HEAD(&td->td_list);
2880 INIT_LIST_HEAD(&td->cancelled_td_list);
2882 if (td_index == 0) {
2883 ret = usb_hcd_link_urb_to_ep(bus_to_hcd(urb->dev->bus), urb);
2889 /* Add this TD to the tail of the endpoint ring's TD list */
2890 list_add_tail(&td->td_list, &ep_ring->td_list);
2891 td->start_seg = ep_ring->enq_seg;
2892 td->first_trb = ep_ring->enqueue;
2894 urb_priv->td[td_index] = td;
2899 static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb)
2901 int num_sgs, num_trbs, running_total, temp, i;
2902 struct scatterlist *sg;
2905 num_sgs = urb->num_mapped_sgs;
2906 temp = urb->transfer_buffer_length;
2908 xhci_dbg(xhci, "count sg list trbs: \n");
2910 for_each_sg(urb->sg, sg, num_sgs, i) {
2911 unsigned int previous_total_trbs = num_trbs;
2912 unsigned int len = sg_dma_len(sg);
2914 /* Scatter gather list entries may cross 64KB boundaries */
2915 running_total = TRB_MAX_BUFF_SIZE -
2916 (sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1));
2917 running_total &= TRB_MAX_BUFF_SIZE - 1;
2918 if (running_total != 0)
2921 /* How many more 64KB chunks to transfer, how many more TRBs? */
2922 while (running_total < sg_dma_len(sg) && running_total < temp) {
2924 running_total += TRB_MAX_BUFF_SIZE;
2926 xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n",
2927 i, (unsigned long long)sg_dma_address(sg),
2928 len, len, num_trbs - previous_total_trbs);
2930 len = min_t(int, len, temp);
2935 xhci_dbg(xhci, "\n");
2936 if (!in_interrupt())
2937 xhci_dbg(xhci, "ep %#x - urb len = %d, sglist used, "
2939 urb->ep->desc.bEndpointAddress,
2940 urb->transfer_buffer_length,
2945 static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
2948 dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated number of "
2949 "TRBs, %d left\n", __func__,
2950 urb->ep->desc.bEndpointAddress, num_trbs);
2951 if (running_total != urb->transfer_buffer_length)
2952 dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, "
2953 "queued %#x (%d), asked for %#x (%d)\n",
2955 urb->ep->desc.bEndpointAddress,
2956 running_total, running_total,
2957 urb->transfer_buffer_length,
2958 urb->transfer_buffer_length);
2961 static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id,
2962 unsigned int ep_index, unsigned int stream_id, int start_cycle,
2963 struct xhci_generic_trb *start_trb)
2966 * Pass all the TRBs to the hardware at once and make sure this write
2971 start_trb->field[3] |= cpu_to_le32(start_cycle);
2973 start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE);
2974 xhci_ring_ep_doorbell(xhci, slot_id, ep_index, stream_id);
2978 * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt
2979 * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD
2980 * (comprised of sg list entries) can take several service intervals to
2983 int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
2984 struct urb *urb, int slot_id, unsigned int ep_index)
2986 struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci,
2987 xhci->devs[slot_id]->out_ctx, ep_index);
2991 xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info));
2992 ep_interval = urb->interval;
2993 /* Convert to microframes */
2994 if (urb->dev->speed == USB_SPEED_LOW ||
2995 urb->dev->speed == USB_SPEED_FULL)
2997 /* FIXME change this to a warning and a suggestion to use the new API
2998 * to set the polling interval (once the API is added).
3000 if (xhci_interval != ep_interval) {
3001 if (printk_ratelimit())
3002 dev_dbg(&urb->dev->dev, "Driver uses different interval"
3003 " (%d microframe%s) than xHCI "
3004 "(%d microframe%s)\n",
3006 ep_interval == 1 ? "" : "s",
3008 xhci_interval == 1 ? "" : "s");
3009 urb->interval = xhci_interval;
3010 /* Convert back to frames for LS/FS devices */
3011 if (urb->dev->speed == USB_SPEED_LOW ||
3012 urb->dev->speed == USB_SPEED_FULL)
3015 return xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb, slot_id, ep_index);
3019 * The TD size is the number of bytes remaining in the TD (including this TRB),
3020 * right shifted by 10.
3021 * It must fit in bits 21:17, so it can't be bigger than 31.
3023 static u32 xhci_td_remainder(unsigned int remainder)
3025 u32 max = (1 << (21 - 17 + 1)) - 1;
3027 if ((remainder >> 10) >= max)
3030 return (remainder >> 10) << 17;
3034 * For xHCI 1.0 host controllers, TD size is the number of max packet sized
3035 * packets remaining in the TD (*not* including this TRB).
3037 * Total TD packet count = total_packet_count =
3038 * DIV_ROUND_UP(TD size in bytes / wMaxPacketSize)
3040 * Packets transferred up to and including this TRB = packets_transferred =
3041 * rounddown(total bytes transferred including this TRB / wMaxPacketSize)
3043 * TD size = total_packet_count - packets_transferred
3045 * It must fit in bits 21:17, so it can't be bigger than 31.
3046 * The last TRB in a TD must have the TD size set to zero.
3048 static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len,
3049 unsigned int total_packet_count, struct urb *urb,
3050 unsigned int num_trbs_left)
3052 int packets_transferred;
3054 /* One TRB with a zero-length data packet. */
3055 if (num_trbs_left == 0 || (running_total == 0 && trb_buff_len == 0))
3058 /* All the TRB queueing functions don't count the current TRB in
3061 packets_transferred = (running_total + trb_buff_len) /
3062 GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));
3064 if ((total_packet_count - packets_transferred) > 31)
3066 return (total_packet_count - packets_transferred) << 17;
3069 static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
3070 struct urb *urb, int slot_id, unsigned int ep_index)
3072 struct xhci_ring *ep_ring;
3073 unsigned int num_trbs;
3074 struct urb_priv *urb_priv;
3076 struct scatterlist *sg;
3078 int trb_buff_len, this_sg_len, running_total;
3079 unsigned int total_packet_count;
3082 bool more_trbs_coming;
3084 struct xhci_generic_trb *start_trb;
3087 ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
3091 num_trbs = count_sg_trbs_needed(xhci, urb);
3092 num_sgs = urb->num_mapped_sgs;
3093 total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
3094 usb_endpoint_maxp(&urb->ep->desc));
3096 trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
3097 ep_index, urb->stream_id,
3098 num_trbs, urb, 0, false, mem_flags);
3099 if (trb_buff_len < 0)
3100 return trb_buff_len;
3102 urb_priv = urb->hcpriv;
3103 td = urb_priv->td[0];
3106 * Don't give the first TRB to the hardware (by toggling the cycle bit)
3107 * until we've finished creating all the other TRBs. The ring's cycle
3108 * state may change as we enqueue the other TRBs, so save it too.
3110 start_trb = &ep_ring->enqueue->generic;
3111 start_cycle = ep_ring->cycle_state;
3115 * How much data is in the first TRB?
3117 * There are three forces at work for TRB buffer pointers and lengths:
3118 * 1. We don't want to walk off the end of this sg-list entry buffer.
3119 * 2. The transfer length that the driver requested may be smaller than
3120 * the amount of memory allocated for this scatter-gather list.
3121 * 3. TRBs buffers can't cross 64KB boundaries.
3124 addr = (u64) sg_dma_address(sg);
3125 this_sg_len = sg_dma_len(sg);
3126 trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & (TRB_MAX_BUFF_SIZE - 1));
3127 trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
3128 if (trb_buff_len > urb->transfer_buffer_length)
3129 trb_buff_len = urb->transfer_buffer_length;
3130 xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n",
3134 /* Queue the first TRB, even if it's zero-length */
3137 u32 length_field = 0;
3140 /* Don't change the cycle bit of the first TRB until later */
3143 if (start_cycle == 0)
3146 field |= ep_ring->cycle_state;
3148 /* Chain all the TRBs together; clear the chain bit in the last
3149 * TRB to indicate it's the last TRB in the chain.
3154 /* FIXME - add check for ZERO_PACKET flag before this */
3155 td->last_trb = ep_ring->enqueue;
3159 /* Only set interrupt on short packet for IN endpoints */
3160 if (usb_urb_dir_in(urb))
3163 xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), "
3164 "64KB boundary at %#x, end dma = %#x\n",
3165 (unsigned int) addr, trb_buff_len, trb_buff_len,
3166 (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
3167 (unsigned int) addr + trb_buff_len);
3168 if (TRB_MAX_BUFF_SIZE -
3169 (addr & (TRB_MAX_BUFF_SIZE - 1)) < trb_buff_len) {
3170 xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n");
3171 xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n",
3172 (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
3173 (unsigned int) addr + trb_buff_len);
3176 /* Set the TRB length, TD size, and interrupter fields. */
3177 if (xhci->hci_version < 0x100) {
3178 remainder = xhci_td_remainder(
3179 urb->transfer_buffer_length -
3182 remainder = xhci_v1_0_td_remainder(running_total,
3183 trb_buff_len, total_packet_count, urb,
3186 length_field = TRB_LEN(trb_buff_len) |
3191 more_trbs_coming = true;
3193 more_trbs_coming = false;
3194 queue_trb(xhci, ep_ring, false, more_trbs_coming, false,
3195 lower_32_bits(addr),
3196 upper_32_bits(addr),
3198 field | TRB_TYPE(TRB_NORMAL));
3200 running_total += trb_buff_len;
3202 /* Calculate length for next transfer --
3203 * Are we done queueing all the TRBs for this sg entry?
3205 this_sg_len -= trb_buff_len;
3206 if (this_sg_len == 0) {
3211 addr = (u64) sg_dma_address(sg);
3212 this_sg_len = sg_dma_len(sg);
3214 addr += trb_buff_len;
3217 trb_buff_len = TRB_MAX_BUFF_SIZE -
3218 (addr & (TRB_MAX_BUFF_SIZE - 1));
3219 trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
3220 if (running_total + trb_buff_len > urb->transfer_buffer_length)
3222 urb->transfer_buffer_length - running_total;
3223 } while (running_total < urb->transfer_buffer_length);
3225 check_trb_math(urb, num_trbs, running_total);
3226 giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
3227 start_cycle, start_trb);
3231 /* This is very similar to what ehci-q.c qtd_fill() does */
3232 int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
3233 struct urb *urb, int slot_id, unsigned int ep_index)
3235 struct xhci_ring *ep_ring;
3236 struct urb_priv *urb_priv;
3239 struct xhci_generic_trb *start_trb;
3241 bool more_trbs_coming;
3243 u32 field, length_field;
3245 int running_total, trb_buff_len, ret;
3246 unsigned int total_packet_count;
3250 return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index);
3252 ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
3257 /* How much data is (potentially) left before the 64KB boundary? */
3258 running_total = TRB_MAX_BUFF_SIZE -
3259 (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1));
3260 running_total &= TRB_MAX_BUFF_SIZE - 1;
3262 /* If there's some data on this 64KB chunk, or we have to send a
3263 * zero-length transfer, we need at least one TRB
3265 if (running_total != 0 || urb->transfer_buffer_length == 0)
3267 /* How many more 64KB chunks to transfer, how many more TRBs? */
3268 while (running_total < urb->transfer_buffer_length) {
3270 running_total += TRB_MAX_BUFF_SIZE;
3272 /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */
3274 if (!in_interrupt())
3275 xhci_dbg(xhci, "ep %#x - urb len = %#x (%d), "
3276 "addr = %#llx, num_trbs = %d\n",
3277 urb->ep->desc.bEndpointAddress,
3278 urb->transfer_buffer_length,
3279 urb->transfer_buffer_length,
3280 (unsigned long long)urb->transfer_dma,
3283 ret = prepare_transfer(xhci, xhci->devs[slot_id],
3284 ep_index, urb->stream_id,
3285 num_trbs, urb, 0, false, mem_flags);
3289 urb_priv = urb->hcpriv;
3290 td = urb_priv->td[0];
3293 * Don't give the first TRB to the hardware (by toggling the cycle bit)
3294 * until we've finished creating all the other TRBs. The ring's cycle
3295 * state may change as we enqueue the other TRBs, so save it too.
3297 start_trb = &ep_ring->enqueue->generic;
3298 start_cycle = ep_ring->cycle_state;
3301 total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
3302 usb_endpoint_maxp(&urb->ep->desc));
3303 /* How much data is in the first TRB? */
3304 addr = (u64) urb->transfer_dma;
3305 trb_buff_len = TRB_MAX_BUFF_SIZE -
3306 (urb->transfer_dma & (TRB_MAX_BUFF_SIZE - 1));
3307 if (trb_buff_len > urb->transfer_buffer_length)
3308 trb_buff_len = urb->transfer_buffer_length;
3312 /* Queue the first TRB, even if it's zero-length */
3317 /* Don't change the cycle bit of the first TRB until later */
3320 if (start_cycle == 0)
3323 field |= ep_ring->cycle_state;
3325 /* Chain all the TRBs together; clear the chain bit in the last
3326 * TRB to indicate it's the last TRB in the chain.
3331 /* FIXME - add check for ZERO_PACKET flag before this */
3332 td->last_trb = ep_ring->enqueue;
3336 /* Only set interrupt on short packet for IN endpoints */
3337 if (usb_urb_dir_in(urb))
3340 /* Set the TRB length, TD size, and interrupter fields. */
3341 if (xhci->hci_version < 0x100) {
3342 remainder = xhci_td_remainder(
3343 urb->transfer_buffer_length -
3346 remainder = xhci_v1_0_td_remainder(running_total,
3347 trb_buff_len, total_packet_count, urb,
3350 length_field = TRB_LEN(trb_buff_len) |
3355 more_trbs_coming = true;
3357 more_trbs_coming = false;
3358 queue_trb(xhci, ep_ring, false, more_trbs_coming, false,
3359 lower_32_bits(addr),
3360 upper_32_bits(addr),
3362 field | TRB_TYPE(TRB_NORMAL));
3364 running_total += trb_buff_len;
3366 /* Calculate length for next transfer */
3367 addr += trb_buff_len;
3368 trb_buff_len = urb->transfer_buffer_length - running_total;
3369 if (trb_buff_len > TRB_MAX_BUFF_SIZE)
3370 trb_buff_len = TRB_MAX_BUFF_SIZE;
3371 } while (running_total < urb->transfer_buffer_length);
3373 check_trb_math(urb, num_trbs, running_total);
3374 giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
3375 start_cycle, start_trb);
3379 /* Caller must have locked xhci->lock */
3380 int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
3381 struct urb *urb, int slot_id, unsigned int ep_index)
3383 struct xhci_ring *ep_ring;
3386 struct usb_ctrlrequest *setup;
3387 struct xhci_generic_trb *start_trb;
3389 u32 field, length_field;
3390 struct urb_priv *urb_priv;
3393 ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
3398 * Need to copy setup packet into setup TRB, so we can't use the setup
3401 if (!urb->setup_packet)
3404 if (!in_interrupt())
3405 xhci_dbg(xhci, "Queueing ctrl tx for slot id %d, ep %d\n",
3407 /* 1 TRB for setup, 1 for status */
3410 * Don't need to check if we need additional event data and normal TRBs,
3411 * since data in control transfers will never get bigger than 16MB
3412 * XXX: can we get a buffer that crosses 64KB boundaries?
3414 if (urb->transfer_buffer_length > 0)
3416 ret = prepare_transfer(xhci, xhci->devs[slot_id],
3417 ep_index, urb->stream_id,
3418 num_trbs, urb, 0, false, mem_flags);
3422 urb_priv = urb->hcpriv;
3423 td = urb_priv->td[0];
3426 * Don't give the first TRB to the hardware (by toggling the cycle bit)
3427 * until we've finished creating all the other TRBs. The ring's cycle
3428 * state may change as we enqueue the other TRBs, so save it too.
3430 start_trb = &ep_ring->enqueue->generic;
3431 start_cycle = ep_ring->cycle_state;
3433 /* Queue setup TRB - see section 6.4.1.2.1 */
3434 /* FIXME better way to translate setup_packet into two u32 fields? */
3435 setup = (struct usb_ctrlrequest *) urb->setup_packet;
3437 field |= TRB_IDT | TRB_TYPE(TRB_SETUP);
3438 if (start_cycle == 0)
3441 /* xHCI 1.0/1.1 6.4.1.2.1: Transfer Type field */
3442 if (xhci->hci_version >= 0x100) {
3443 if (urb->transfer_buffer_length > 0) {
3444 if (setup->bRequestType & USB_DIR_IN)
3445 field |= TRB_TX_TYPE(TRB_DATA_IN);
3447 field |= TRB_TX_TYPE(TRB_DATA_OUT);
3451 queue_trb(xhci, ep_ring, false, true, false,
3452 setup->bRequestType | setup->bRequest << 8 | le16_to_cpu(setup->wValue) << 16,
3453 le16_to_cpu(setup->wIndex) | le16_to_cpu(setup->wLength) << 16,
3454 TRB_LEN(8) | TRB_INTR_TARGET(0),
3455 /* Immediate data in pointer */
3458 /* If there's data, queue data TRBs */
3459 /* Only set interrupt on short packet for IN endpoints */
3460 if (usb_urb_dir_in(urb))
3461 field = TRB_ISP | TRB_TYPE(TRB_DATA);
3463 field = TRB_TYPE(TRB_DATA);
3465 length_field = TRB_LEN(urb->transfer_buffer_length) |
3466 xhci_td_remainder(urb->transfer_buffer_length) |
3468 if (urb->transfer_buffer_length > 0) {
3469 if (setup->bRequestType & USB_DIR_IN)
3470 field |= TRB_DIR_IN;
3471 queue_trb(xhci, ep_ring, false, true, false,
3472 lower_32_bits(urb->transfer_dma),
3473 upper_32_bits(urb->transfer_dma),
3475 field | ep_ring->cycle_state);
3478 /* Save the DMA address of the last TRB in the TD */
3479 td->last_trb = ep_ring->enqueue;
3481 /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */
3482 /* If the device sent data, the status stage is an OUT transfer */
3483 if (urb->transfer_buffer_length > 0 && setup->bRequestType & USB_DIR_IN)
3487 queue_trb(xhci, ep_ring, false, false, false,
3491 /* Event on completion */
3492 field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state);
3494 giveback_first_trb(xhci, slot_id, ep_index, 0,
3495 start_cycle, start_trb);
3499 static int count_isoc_trbs_needed(struct xhci_hcd *xhci,
3500 struct urb *urb, int i)
3505 addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset);
3506 td_len = urb->iso_frame_desc[i].length;
3508 num_trbs = DIV_ROUND_UP(td_len + (addr & (TRB_MAX_BUFF_SIZE - 1)),
3517 * The transfer burst count field of the isochronous TRB defines the number of
3518 * bursts that are required to move all packets in this TD. Only SuperSpeed
3519 * devices can burst up to bMaxBurst number of packets per service interval.
3520 * This field is zero based, meaning a value of zero in the field means one
3521 * burst. Basically, for everything but SuperSpeed devices, this field will be
3522 * zero. Only xHCI 1.0 host controllers support this field.
3524 static unsigned int xhci_get_burst_count(struct xhci_hcd *xhci,
3525 struct usb_device *udev,
3526 struct urb *urb, unsigned int total_packet_count)
3528 unsigned int max_burst;
3530 if (xhci->hci_version < 0x100 || udev->speed != USB_SPEED_SUPER)
3533 max_burst = urb->ep->ss_ep_comp.bMaxBurst;
3534 return DIV_ROUND_UP(total_packet_count, max_burst + 1) - 1;
3538 * Returns the number of packets in the last "burst" of packets. This field is
3539 * valid for all speeds of devices. USB 2.0 devices can only do one "burst", so
3540 * the last burst packet count is equal to the total number of packets in the
3541 * TD. SuperSpeed endpoints can have up to 3 bursts. All but the last burst
3542 * must contain (bMaxBurst + 1) number of packets, but the last burst can
3543 * contain 1 to (bMaxBurst + 1) packets.
3545 static unsigned int xhci_get_last_burst_packet_count(struct xhci_hcd *xhci,
3546 struct usb_device *udev,
3547 struct urb *urb, unsigned int total_packet_count)
3549 unsigned int max_burst;
3550 unsigned int residue;
3552 if (xhci->hci_version < 0x100)
3555 switch (udev->speed) {
3556 case USB_SPEED_SUPER:
3557 /* bMaxBurst is zero based: 0 means 1 packet per burst */
3558 max_burst = urb->ep->ss_ep_comp.bMaxBurst;
3559 residue = total_packet_count % (max_burst + 1);
3560 /* If residue is zero, the last burst contains (max_burst + 1)
3561 * number of packets, but the TLBPC field is zero-based.
3567 if (total_packet_count == 0)
3569 return total_packet_count - 1;
3573 /* This is for isoc transfer */
3574 static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
3575 struct urb *urb, int slot_id, unsigned int ep_index)
3577 struct xhci_ring *ep_ring;
3578 struct urb_priv *urb_priv;
3580 int num_tds, trbs_per_td;
3581 struct xhci_generic_trb *start_trb;
3584 u32 field, length_field;
3585 int running_total, trb_buff_len, td_len, td_remain_len, ret;
3586 u64 start_addr, addr;
3588 bool more_trbs_coming;
3590 ep_ring = xhci->devs[slot_id]->eps[ep_index].ring;
3592 num_tds = urb->number_of_packets;
3594 xhci_dbg(xhci, "Isoc URB with zero packets?\n");
3598 if (!in_interrupt())
3599 xhci_dbg(xhci, "ep %#x - urb len = %#x (%d),"
3600 " addr = %#llx, num_tds = %d\n",
3601 urb->ep->desc.bEndpointAddress,
3602 urb->transfer_buffer_length,
3603 urb->transfer_buffer_length,
3604 (unsigned long long)urb->transfer_dma,
3607 start_addr = (u64) urb->transfer_dma;
3608 start_trb = &ep_ring->enqueue->generic;
3609 start_cycle = ep_ring->cycle_state;
3611 urb_priv = urb->hcpriv;
3612 /* Queue the first TRB, even if it's zero-length */
3613 for (i = 0; i < num_tds; i++) {
3614 unsigned int total_packet_count;
3615 unsigned int burst_count;
3616 unsigned int residue;
3620 addr = start_addr + urb->iso_frame_desc[i].offset;
3621 td_len = urb->iso_frame_desc[i].length;
3622 td_remain_len = td_len;
3623 total_packet_count = DIV_ROUND_UP(td_len,
3625 usb_endpoint_maxp(&urb->ep->desc)));
3626 /* A zero-length transfer still involves at least one packet. */
3627 if (total_packet_count == 0)
3628 total_packet_count++;
3629 burst_count = xhci_get_burst_count(xhci, urb->dev, urb,
3630 total_packet_count);
3631 residue = xhci_get_last_burst_packet_count(xhci,
3632 urb->dev, urb, total_packet_count);
3634 trbs_per_td = count_isoc_trbs_needed(xhci, urb, i);
3636 ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index,
3637 urb->stream_id, trbs_per_td, urb, i, true,
3645 td = urb_priv->td[i];
3646 for (j = 0; j < trbs_per_td; j++) {
3651 field = TRB_TBC(burst_count) |
3653 /* Queue the isoc TRB */
3654 field |= TRB_TYPE(TRB_ISOC);
3655 /* Assume URB_ISO_ASAP is set */
3658 if (start_cycle == 0)
3661 field |= ep_ring->cycle_state;
3664 /* Queue other normal TRBs */
3665 field |= TRB_TYPE(TRB_NORMAL);
3666 field |= ep_ring->cycle_state;
3669 /* Only set interrupt on short packet for IN EPs */
3670 if (usb_urb_dir_in(urb))
3673 /* Chain all the TRBs together; clear the chain bit in
3674 * the last TRB to indicate it's the last TRB in the
3677 if (j < trbs_per_td - 1) {
3679 more_trbs_coming = true;
3681 td->last_trb = ep_ring->enqueue;
3683 if (xhci->hci_version == 0x100 &&
3686 /* Set BEI bit except for the last td */
3687 if (i < num_tds - 1)
3690 more_trbs_coming = false;
3693 /* Calculate TRB length */
3694 trb_buff_len = TRB_MAX_BUFF_SIZE -
3695 (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
3696 if (trb_buff_len > td_remain_len)
3697 trb_buff_len = td_remain_len;
3699 /* Set the TRB length, TD size, & interrupter fields. */
3700 if (xhci->hci_version < 0x100) {
3701 remainder = xhci_td_remainder(
3702 td_len - running_total);
3704 remainder = xhci_v1_0_td_remainder(
3705 running_total, trb_buff_len,
3706 total_packet_count, urb,
3707 (trbs_per_td - j - 1));
3709 length_field = TRB_LEN(trb_buff_len) |
3713 queue_trb(xhci, ep_ring, false, more_trbs_coming, true,
3714 lower_32_bits(addr),
3715 upper_32_bits(addr),
3718 running_total += trb_buff_len;
3720 addr += trb_buff_len;
3721 td_remain_len -= trb_buff_len;
3724 /* Check TD length */
3725 if (running_total != td_len) {
3726 xhci_err(xhci, "ISOC TD length unmatch\n");
3732 if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) {
3733 if (xhci->quirks & XHCI_AMD_PLL_FIX)
3734 usb_amd_quirk_pll_disable();
3736 xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs++;
3738 giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
3739 start_cycle, start_trb);
3742 /* Clean up a partially enqueued isoc transfer. */
3744 for (i--; i >= 0; i--)
3745 list_del_init(&urb_priv->td[i]->td_list);
3747 /* Use the first TD as a temporary variable to turn the TDs we've queued
3748 * into No-ops with a software-owned cycle bit. That way the hardware
3749 * won't accidentally start executing bogus TDs when we partially
3750 * overwrite them. td->first_trb and td->start_seg are already set.
3752 urb_priv->td[0]->last_trb = ep_ring->enqueue;
3753 /* Every TRB except the first & last will have its cycle bit flipped. */
3754 td_to_noop(xhci, ep_ring, urb_priv->td[0], true);
3756 /* Reset the ring enqueue back to the first TRB and its cycle bit. */
3757 ep_ring->enqueue = urb_priv->td[0]->first_trb;
3758 ep_ring->enq_seg = urb_priv->td[0]->start_seg;
3759 ep_ring->cycle_state = start_cycle;
3760 usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb);
3765 * Check transfer ring to guarantee there is enough room for the urb.
3766 * Update ISO URB start_frame and interval.
3767 * Update interval as xhci_queue_intr_tx does. Just use xhci frame_index to
3768 * update the urb->start_frame by now.
3769 * Always assume URB_ISO_ASAP set, and NEVER use urb->start_frame as input.
3771 int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags,
3772 struct urb *urb, int slot_id, unsigned int ep_index)
3774 struct xhci_virt_device *xdev;
3775 struct xhci_ring *ep_ring;
3776 struct xhci_ep_ctx *ep_ctx;
3780 int num_tds, num_trbs, i;
3783 xdev = xhci->devs[slot_id];
3784 ep_ring = xdev->eps[ep_index].ring;
3785 ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
3788 num_tds = urb->number_of_packets;
3789 for (i = 0; i < num_tds; i++)
3790 num_trbs += count_isoc_trbs_needed(xhci, urb, i);
3792 /* Check the ring to guarantee there is enough room for the whole urb.
3793 * Do not insert any td of the urb to the ring if the check failed.
3795 ret = prepare_ring(xhci, ep_ring, le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK,
3796 num_trbs, true, mem_flags);
3800 start_frame = xhci_readl(xhci, &xhci->run_regs->microframe_index);
3801 start_frame &= 0x3fff;
3803 urb->start_frame = start_frame;
3804 if (urb->dev->speed == USB_SPEED_LOW ||
3805 urb->dev->speed == USB_SPEED_FULL)
3806 urb->start_frame >>= 3;
3808 xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info));
3809 ep_interval = urb->interval;
3810 /* Convert to microframes */
3811 if (urb->dev->speed == USB_SPEED_LOW ||
3812 urb->dev->speed == USB_SPEED_FULL)
3814 /* FIXME change this to a warning and a suggestion to use the new API
3815 * to set the polling interval (once the API is added).
3817 if (xhci_interval != ep_interval) {
3818 if (printk_ratelimit())
3819 dev_dbg(&urb->dev->dev, "Driver uses different interval"
3820 " (%d microframe%s) than xHCI "
3821 "(%d microframe%s)\n",
3823 ep_interval == 1 ? "" : "s",
3825 xhci_interval == 1 ? "" : "s");
3826 urb->interval = xhci_interval;
3827 /* Convert back to frames for LS/FS devices */
3828 if (urb->dev->speed == USB_SPEED_LOW ||
3829 urb->dev->speed == USB_SPEED_FULL)
3832 return xhci_queue_isoc_tx(xhci, GFP_ATOMIC, urb, slot_id, ep_index);
3835 /**** Command Ring Operations ****/
3837 /* Generic function for queueing a command TRB on the command ring.
3838 * Check to make sure there's room on the command ring for one command TRB.
3839 * Also check that there's room reserved for commands that must not fail.
3840 * If this is a command that must not fail, meaning command_must_succeed = TRUE,
3841 * then only check for the number of reserved spots.
3842 * Don't decrement xhci->cmd_ring_reserved_trbs after we've queued the TRB
3843 * because the command event handler may want to resubmit a failed command.
3845 static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2,
3846 u32 field3, u32 field4, bool command_must_succeed)
3848 int reserved_trbs = xhci->cmd_ring_reserved_trbs;
3851 if (!command_must_succeed)
3854 ret = prepare_ring(xhci, xhci->cmd_ring, EP_STATE_RUNNING,
3855 reserved_trbs, false, GFP_ATOMIC);
3857 xhci_err(xhci, "ERR: No room for command on command ring\n");
3858 if (command_must_succeed)
3859 xhci_err(xhci, "ERR: Reserved TRB counting for "
3860 "unfailable commands failed.\n");
3863 queue_trb(xhci, xhci->cmd_ring, false, false, false, field1, field2,
3864 field3, field4 | xhci->cmd_ring->cycle_state);
3868 /* Queue a slot enable or disable request on the command ring */
3869 int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id)
3871 return queue_command(xhci, 0, 0, 0,
3872 TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id), false);
3875 /* Queue an address device command TRB */
3876 int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
3879 return queue_command(xhci, lower_32_bits(in_ctx_ptr),
3880 upper_32_bits(in_ctx_ptr), 0,
3881 TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id),
3885 int xhci_queue_vendor_command(struct xhci_hcd *xhci,
3886 u32 field1, u32 field2, u32 field3, u32 field4)
3888 return queue_command(xhci, field1, field2, field3, field4, false);
3891 /* Queue a reset device command TRB */
3892 int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id)
3894 return queue_command(xhci, 0, 0, 0,
3895 TRB_TYPE(TRB_RESET_DEV) | SLOT_ID_FOR_TRB(slot_id),
3899 /* Queue a configure endpoint command TRB */
3900 int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
3901 u32 slot_id, bool command_must_succeed)
3903 return queue_command(xhci, lower_32_bits(in_ctx_ptr),
3904 upper_32_bits(in_ctx_ptr), 0,
3905 TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id),
3906 command_must_succeed);
3909 /* Queue an evaluate context command TRB */
3910 int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
3913 return queue_command(xhci, lower_32_bits(in_ctx_ptr),
3914 upper_32_bits(in_ctx_ptr), 0,
3915 TRB_TYPE(TRB_EVAL_CONTEXT) | SLOT_ID_FOR_TRB(slot_id),
3920 * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop
3921 * activity on an endpoint that is about to be suspended.
3923 int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
3924 unsigned int ep_index, int suspend)
3926 u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
3927 u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
3928 u32 type = TRB_TYPE(TRB_STOP_RING);
3929 u32 trb_suspend = SUSPEND_PORT_FOR_TRB(suspend);
3931 return queue_command(xhci, 0, 0, 0,
3932 trb_slot_id | trb_ep_index | type | trb_suspend, false);
3935 /* Set Transfer Ring Dequeue Pointer command.
3936 * This should not be used for endpoints that have streams enabled.
3938 static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
3939 unsigned int ep_index, unsigned int stream_id,
3940 struct xhci_segment *deq_seg,
3941 union xhci_trb *deq_ptr, u32 cycle_state)
3944 u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
3945 u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
3946 u32 trb_stream_id = STREAM_ID_FOR_TRB(stream_id);
3947 u32 type = TRB_TYPE(TRB_SET_DEQ);
3948 struct xhci_virt_ep *ep;
3950 addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr);
3952 xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n");
3953 xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n",
3957 ep = &xhci->devs[slot_id]->eps[ep_index];
3958 if ((ep->ep_state & SET_DEQ_PENDING)) {
3959 xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n");
3960 xhci_warn(xhci, "A Set TR Deq Ptr command is pending.\n");
3963 ep->queued_deq_seg = deq_seg;
3964 ep->queued_deq_ptr = deq_ptr;
3965 return queue_command(xhci, lower_32_bits(addr) | cycle_state,
3966 upper_32_bits(addr), trb_stream_id,
3967 trb_slot_id | trb_ep_index | type, false);
3970 int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id,
3971 unsigned int ep_index)
3973 u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
3974 u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
3975 u32 type = TRB_TYPE(TRB_RESET_EP);
3977 return queue_command(xhci, 0, 0, 0, trb_slot_id | trb_ep_index | type,