xhci 1.0: Set transfer burst count field.
[pandora-kernel.git] / drivers / usb / host / xhci-ring.c
1 /*
2  * xHCI host controller driver
3  *
4  * Copyright (C) 2008 Intel Corp.
5  *
6  * Author: Sarah Sharp
7  * Some code borrowed from the Linux EHCI driver.
8  *
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.
12  *
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
16  * for more details.
17  *
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.
21  */
22
23 /*
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.
29  *
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.
41  *
42  * Cycle bit rules:
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.
47  *
48  * Producer rules:
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
52  *    cycle state).
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.
56  *
57  * Consumer 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.
65  */
66
67 #include <linux/scatterlist.h>
68 #include <linux/slab.h>
69 #include "xhci.h"
70
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);
74
75 /*
76  * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
77  * address of the TRB.
78  */
79 dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
80                 union xhci_trb *trb)
81 {
82         unsigned long segment_offset;
83
84         if (!seg || !trb || trb < seg->trbs)
85                 return 0;
86         /* offset in TRBs */
87         segment_offset = trb - seg->trbs;
88         if (segment_offset > TRBS_PER_SEGMENT)
89                 return 0;
90         return seg->dma + (segment_offset * sizeof(*trb));
91 }
92
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?
95  */
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)
98 {
99         if (ring == xhci->event_ring)
100                 return (trb == &seg->trbs[TRBS_PER_SEGMENT]) &&
101                         (seg->next == xhci->event_ring->first_seg);
102         else
103                 return le32_to_cpu(trb->link.control) & LINK_TOGGLE;
104 }
105
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
108  * event seg?
109  */
110 static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
111                 struct xhci_segment *seg, union xhci_trb *trb)
112 {
113         if (ring == xhci->event_ring)
114                 return trb == &seg->trbs[TRBS_PER_SEGMENT];
115         else
116                 return (le32_to_cpu(trb->link.control) & TRB_TYPE_BITMASK)
117                         == TRB_TYPE(TRB_LINK);
118 }
119
120 static int enqueue_is_link_trb(struct xhci_ring *ring)
121 {
122         struct xhci_link_trb *link = &ring->enqueue->link;
123         return ((le32_to_cpu(link->control) & TRB_TYPE_BITMASK) ==
124                 TRB_TYPE(TRB_LINK));
125 }
126
127 /* Updates trb to point to the next TRB in the ring, and updates seg if the next
128  * TRB is in a new segment.  This does not skip over link TRBs, and it does not
129  * effect the ring dequeue or enqueue pointers.
130  */
131 static void next_trb(struct xhci_hcd *xhci,
132                 struct xhci_ring *ring,
133                 struct xhci_segment **seg,
134                 union xhci_trb **trb)
135 {
136         if (last_trb(xhci, ring, *seg, *trb)) {
137                 *seg = (*seg)->next;
138                 *trb = ((*seg)->trbs);
139         } else {
140                 (*trb)++;
141         }
142 }
143
144 /*
145  * See Cycle bit rules. SW is the consumer for the event ring only.
146  * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
147  */
148 static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
149 {
150         union xhci_trb *next = ++(ring->dequeue);
151         unsigned long long addr;
152
153         ring->deq_updates++;
154         /* Update the dequeue pointer further if that was a link TRB or we're at
155          * the end of an event ring segment (which doesn't have link TRBS)
156          */
157         while (last_trb(xhci, ring, ring->deq_seg, next)) {
158                 if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) {
159                         ring->cycle_state = (ring->cycle_state ? 0 : 1);
160                         if (!in_interrupt())
161                                 xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
162                                                 ring,
163                                                 (unsigned int) ring->cycle_state);
164                 }
165                 ring->deq_seg = ring->deq_seg->next;
166                 ring->dequeue = ring->deq_seg->trbs;
167                 next = ring->dequeue;
168         }
169         addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
170         if (ring == xhci->event_ring)
171                 xhci_dbg(xhci, "Event ring deq = 0x%llx (DMA)\n", addr);
172         else if (ring == xhci->cmd_ring)
173                 xhci_dbg(xhci, "Command ring deq = 0x%llx (DMA)\n", addr);
174         else
175                 xhci_dbg(xhci, "Ring deq = 0x%llx (DMA)\n", addr);
176 }
177
178 /*
179  * See Cycle bit rules. SW is the consumer for the event ring only.
180  * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
181  *
182  * If we've just enqueued a TRB that is in the middle of a TD (meaning the
183  * chain bit is set), then set the chain bit in all the following link TRBs.
184  * If we've enqueued the last TRB in a TD, make sure the following link TRBs
185  * have their chain bit cleared (so that each Link TRB is a separate TD).
186  *
187  * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit
188  * set, but other sections talk about dealing with the chain bit set.  This was
189  * fixed in the 0.96 specification errata, but we have to assume that all 0.95
190  * xHCI hardware can't handle the chain bit being cleared on a link TRB.
191  *
192  * @more_trbs_coming:   Will you enqueue more TRBs before calling
193  *                      prepare_transfer()?
194  */
195 static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
196                 bool consumer, bool more_trbs_coming)
197 {
198         u32 chain;
199         union xhci_trb *next;
200         unsigned long long addr;
201
202         chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
203         next = ++(ring->enqueue);
204
205         ring->enq_updates++;
206         /* Update the dequeue pointer further if that was a link TRB or we're at
207          * the end of an event ring segment (which doesn't have link TRBS)
208          */
209         while (last_trb(xhci, ring, ring->enq_seg, next)) {
210                 if (!consumer) {
211                         if (ring != xhci->event_ring) {
212                                 /*
213                                  * If the caller doesn't plan on enqueueing more
214                                  * TDs before ringing the doorbell, then we
215                                  * don't want to give the link TRB to the
216                                  * hardware just yet.  We'll give the link TRB
217                                  * back in prepare_ring() just before we enqueue
218                                  * the TD at the top of the ring.
219                                  */
220                                 if (!chain && !more_trbs_coming)
221                                         break;
222
223                                 /* If we're not dealing with 0.95 hardware,
224                                  * carry over the chain bit of the previous TRB
225                                  * (which may mean the chain bit is cleared).
226                                  */
227                                 if (!xhci_link_trb_quirk(xhci)) {
228                                         next->link.control &=
229                                                 cpu_to_le32(~TRB_CHAIN);
230                                         next->link.control |=
231                                                 cpu_to_le32(chain);
232                                 }
233                                 /* Give this link TRB to the hardware */
234                                 wmb();
235                                 next->link.control ^= cpu_to_le32(TRB_CYCLE);
236                         }
237                         /* Toggle the cycle bit after the last ring segment. */
238                         if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
239                                 ring->cycle_state = (ring->cycle_state ? 0 : 1);
240                                 if (!in_interrupt())
241                                         xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
242                                                         ring,
243                                                         (unsigned int) ring->cycle_state);
244                         }
245                 }
246                 ring->enq_seg = ring->enq_seg->next;
247                 ring->enqueue = ring->enq_seg->trbs;
248                 next = ring->enqueue;
249         }
250         addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
251         if (ring == xhci->event_ring)
252                 xhci_dbg(xhci, "Event ring enq = 0x%llx (DMA)\n", addr);
253         else if (ring == xhci->cmd_ring)
254                 xhci_dbg(xhci, "Command ring enq = 0x%llx (DMA)\n", addr);
255         else
256                 xhci_dbg(xhci, "Ring enq = 0x%llx (DMA)\n", addr);
257 }
258
259 /*
260  * Check to see if there's room to enqueue num_trbs on the ring.  See rules
261  * above.
262  * FIXME: this would be simpler and faster if we just kept track of the number
263  * of free TRBs in a ring.
264  */
265 static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
266                 unsigned int num_trbs)
267 {
268         int i;
269         union xhci_trb *enq = ring->enqueue;
270         struct xhci_segment *enq_seg = ring->enq_seg;
271         struct xhci_segment *cur_seg;
272         unsigned int left_on_ring;
273
274         /* If we are currently pointing to a link TRB, advance the
275          * enqueue pointer before checking for space */
276         while (last_trb(xhci, ring, enq_seg, enq)) {
277                 enq_seg = enq_seg->next;
278                 enq = enq_seg->trbs;
279         }
280
281         /* Check if ring is empty */
282         if (enq == ring->dequeue) {
283                 /* Can't use link trbs */
284                 left_on_ring = TRBS_PER_SEGMENT - 1;
285                 for (cur_seg = enq_seg->next; cur_seg != enq_seg;
286                                 cur_seg = cur_seg->next)
287                         left_on_ring += TRBS_PER_SEGMENT - 1;
288
289                 /* Always need one TRB free in the ring. */
290                 left_on_ring -= 1;
291                 if (num_trbs > left_on_ring) {
292                         xhci_warn(xhci, "Not enough room on ring; "
293                                         "need %u TRBs, %u TRBs left\n",
294                                         num_trbs, left_on_ring);
295                         return 0;
296                 }
297                 return 1;
298         }
299         /* Make sure there's an extra empty TRB available */
300         for (i = 0; i <= num_trbs; ++i) {
301                 if (enq == ring->dequeue)
302                         return 0;
303                 enq++;
304                 while (last_trb(xhci, ring, enq_seg, enq)) {
305                         enq_seg = enq_seg->next;
306                         enq = enq_seg->trbs;
307                 }
308         }
309         return 1;
310 }
311
312 /* Ring the host controller doorbell after placing a command on the ring */
313 void xhci_ring_cmd_db(struct xhci_hcd *xhci)
314 {
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]);
319 }
320
321 void xhci_ring_ep_doorbell(struct xhci_hcd *xhci,
322                 unsigned int slot_id,
323                 unsigned int ep_index,
324                 unsigned int stream_id)
325 {
326         __le32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
327         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
328         unsigned int ep_state = ep->ep_state;
329
330         /* Don't ring the doorbell for this endpoint if there are pending
331          * cancellations because we don't want to interrupt processing.
332          * We don't want to restart any stream rings if there's a set dequeue
333          * pointer command pending because the device can choose to start any
334          * stream once the endpoint is on the HW schedule.
335          * FIXME - check all the stream rings for pending cancellations.
336          */
337         if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) ||
338             (ep_state & EP_HALTED))
339                 return;
340         xhci_writel(xhci, DB_VALUE(ep_index, stream_id), db_addr);
341         /* The CPU has better things to do at this point than wait for a
342          * write-posting flush.  It'll get there soon enough.
343          */
344 }
345
346 /* Ring the doorbell for any rings with pending URBs */
347 static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci,
348                 unsigned int slot_id,
349                 unsigned int ep_index)
350 {
351         unsigned int stream_id;
352         struct xhci_virt_ep *ep;
353
354         ep = &xhci->devs[slot_id]->eps[ep_index];
355
356         /* A ring has pending URBs if its TD list is not empty */
357         if (!(ep->ep_state & EP_HAS_STREAMS)) {
358                 if (!(list_empty(&ep->ring->td_list)))
359                         xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0);
360                 return;
361         }
362
363         for (stream_id = 1; stream_id < ep->stream_info->num_streams;
364                         stream_id++) {
365                 struct xhci_stream_info *stream_info = ep->stream_info;
366                 if (!list_empty(&stream_info->stream_rings[stream_id]->td_list))
367                         xhci_ring_ep_doorbell(xhci, slot_id, ep_index,
368                                                 stream_id);
369         }
370 }
371
372 /*
373  * Find the segment that trb is in.  Start searching in start_seg.
374  * If we must move past a segment that has a link TRB with a toggle cycle state
375  * bit set, then we will toggle the value pointed at by cycle_state.
376  */
377 static struct xhci_segment *find_trb_seg(
378                 struct xhci_segment *start_seg,
379                 union xhci_trb  *trb, int *cycle_state)
380 {
381         struct xhci_segment *cur_seg = start_seg;
382         struct xhci_generic_trb *generic_trb;
383
384         while (cur_seg->trbs > trb ||
385                         &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
386                 generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
387                 if (le32_to_cpu(generic_trb->field[3]) & LINK_TOGGLE)
388                         *cycle_state ^= 0x1;
389                 cur_seg = cur_seg->next;
390                 if (cur_seg == start_seg)
391                         /* Looped over the entire list.  Oops! */
392                         return NULL;
393         }
394         return cur_seg;
395 }
396
397
398 static struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci,
399                 unsigned int slot_id, unsigned int ep_index,
400                 unsigned int stream_id)
401 {
402         struct xhci_virt_ep *ep;
403
404         ep = &xhci->devs[slot_id]->eps[ep_index];
405         /* Common case: no streams */
406         if (!(ep->ep_state & EP_HAS_STREAMS))
407                 return ep->ring;
408
409         if (stream_id == 0) {
410                 xhci_warn(xhci,
411                                 "WARN: Slot ID %u, ep index %u has streams, "
412                                 "but URB has no stream ID.\n",
413                                 slot_id, ep_index);
414                 return NULL;
415         }
416
417         if (stream_id < ep->stream_info->num_streams)
418                 return ep->stream_info->stream_rings[stream_id];
419
420         xhci_warn(xhci,
421                         "WARN: Slot ID %u, ep index %u has "
422                         "stream IDs 1 to %u allocated, "
423                         "but stream ID %u is requested.\n",
424                         slot_id, ep_index,
425                         ep->stream_info->num_streams - 1,
426                         stream_id);
427         return NULL;
428 }
429
430 /* Get the right ring for the given URB.
431  * If the endpoint supports streams, boundary check the URB's stream ID.
432  * If the endpoint doesn't support streams, return the singular endpoint ring.
433  */
434 static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
435                 struct urb *urb)
436 {
437         return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id,
438                 xhci_get_endpoint_index(&urb->ep->desc), urb->stream_id);
439 }
440
441 /*
442  * Move the xHC's endpoint ring dequeue pointer past cur_td.
443  * Record the new state of the xHC's endpoint ring dequeue segment,
444  * dequeue pointer, and new consumer cycle state in state.
445  * Update our internal representation of the ring's dequeue pointer.
446  *
447  * We do this in three jumps:
448  *  - First we update our new ring state to be the same as when the xHC stopped.
449  *  - Then we traverse the ring to find the segment that contains
450  *    the last TRB in the TD.  We toggle the xHC's new cycle state when we pass
451  *    any link TRBs with the toggle cycle bit set.
452  *  - Finally we move the dequeue state one TRB further, toggling the cycle bit
453  *    if we've moved it past a link TRB with the toggle cycle bit set.
454  *
455  * Some of the uses of xhci_generic_trb are grotty, but if they're done
456  * with correct __le32 accesses they should work fine.  Only users of this are
457  * in here.
458  */
459 void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
460                 unsigned int slot_id, unsigned int ep_index,
461                 unsigned int stream_id, struct xhci_td *cur_td,
462                 struct xhci_dequeue_state *state)
463 {
464         struct xhci_virt_device *dev = xhci->devs[slot_id];
465         struct xhci_ring *ep_ring;
466         struct xhci_generic_trb *trb;
467         struct xhci_ep_ctx *ep_ctx;
468         dma_addr_t addr;
469
470         ep_ring = xhci_triad_to_transfer_ring(xhci, slot_id,
471                         ep_index, stream_id);
472         if (!ep_ring) {
473                 xhci_warn(xhci, "WARN can't find new dequeue state "
474                                 "for invalid stream ID %u.\n",
475                                 stream_id);
476                 return;
477         }
478         state->new_cycle_state = 0;
479         xhci_dbg(xhci, "Finding segment containing stopped TRB.\n");
480         state->new_deq_seg = find_trb_seg(cur_td->start_seg,
481                         dev->eps[ep_index].stopped_trb,
482                         &state->new_cycle_state);
483         if (!state->new_deq_seg) {
484                 WARN_ON(1);
485                 return;
486         }
487
488         /* Dig out the cycle state saved by the xHC during the stop ep cmd */
489         xhci_dbg(xhci, "Finding endpoint context\n");
490         ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
491         state->new_cycle_state = 0x1 & le64_to_cpu(ep_ctx->deq);
492
493         state->new_deq_ptr = cur_td->last_trb;
494         xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n");
495         state->new_deq_seg = find_trb_seg(state->new_deq_seg,
496                         state->new_deq_ptr,
497                         &state->new_cycle_state);
498         if (!state->new_deq_seg) {
499                 WARN_ON(1);
500                 return;
501         }
502
503         trb = &state->new_deq_ptr->generic;
504         if ((le32_to_cpu(trb->field[3]) & TRB_TYPE_BITMASK) ==
505             TRB_TYPE(TRB_LINK) && (le32_to_cpu(trb->field[3]) & LINK_TOGGLE))
506                 state->new_cycle_state ^= 0x1;
507         next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
508
509         /*
510          * If there is only one segment in a ring, find_trb_seg()'s while loop
511          * will not run, and it will return before it has a chance to see if it
512          * needs to toggle the cycle bit.  It can't tell if the stalled transfer
513          * ended just before the link TRB on a one-segment ring, or if the TD
514          * wrapped around the top of the ring, because it doesn't have the TD in
515          * question.  Look for the one-segment case where stalled TRB's address
516          * is greater than the new dequeue pointer address.
517          */
518         if (ep_ring->first_seg == ep_ring->first_seg->next &&
519                         state->new_deq_ptr < dev->eps[ep_index].stopped_trb)
520                 state->new_cycle_state ^= 0x1;
521         xhci_dbg(xhci, "Cycle state = 0x%x\n", state->new_cycle_state);
522
523         /* Don't update the ring cycle state for the producer (us). */
524         xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
525                         state->new_deq_seg);
526         addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
527         xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
528                         (unsigned long long) addr);
529 }
530
531 static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
532                 struct xhci_td *cur_td)
533 {
534         struct xhci_segment *cur_seg;
535         union xhci_trb *cur_trb;
536
537         for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
538                         true;
539                         next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
540                 if ((le32_to_cpu(cur_trb->generic.field[3]) & TRB_TYPE_BITMASK)
541                     == TRB_TYPE(TRB_LINK)) {
542                         /* Unchain any chained Link TRBs, but
543                          * leave the pointers intact.
544                          */
545                         cur_trb->generic.field[3] &= cpu_to_le32(~TRB_CHAIN);
546                         xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
547                         xhci_dbg(xhci, "Address = %p (0x%llx dma); "
548                                         "in seg %p (0x%llx dma)\n",
549                                         cur_trb,
550                                         (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
551                                         cur_seg,
552                                         (unsigned long long)cur_seg->dma);
553                 } else {
554                         cur_trb->generic.field[0] = 0;
555                         cur_trb->generic.field[1] = 0;
556                         cur_trb->generic.field[2] = 0;
557                         /* Preserve only the cycle bit of this TRB */
558                         cur_trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE);
559                         cur_trb->generic.field[3] |= cpu_to_le32(
560                                 TRB_TYPE(TRB_TR_NOOP));
561                         xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
562                                         "in seg %p (0x%llx dma)\n",
563                                         cur_trb,
564                                         (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
565                                         cur_seg,
566                                         (unsigned long long)cur_seg->dma);
567                 }
568                 if (cur_trb == cur_td->last_trb)
569                         break;
570         }
571 }
572
573 static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
574                 unsigned int ep_index, unsigned int stream_id,
575                 struct xhci_segment *deq_seg,
576                 union xhci_trb *deq_ptr, u32 cycle_state);
577
578 void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
579                 unsigned int slot_id, unsigned int ep_index,
580                 unsigned int stream_id,
581                 struct xhci_dequeue_state *deq_state)
582 {
583         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
584
585         xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
586                         "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
587                         deq_state->new_deq_seg,
588                         (unsigned long long)deq_state->new_deq_seg->dma,
589                         deq_state->new_deq_ptr,
590                         (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr),
591                         deq_state->new_cycle_state);
592         queue_set_tr_deq(xhci, slot_id, ep_index, stream_id,
593                         deq_state->new_deq_seg,
594                         deq_state->new_deq_ptr,
595                         (u32) deq_state->new_cycle_state);
596         /* Stop the TD queueing code from ringing the doorbell until
597          * this command completes.  The HC won't set the dequeue pointer
598          * if the ring is running, and ringing the doorbell starts the
599          * ring running.
600          */
601         ep->ep_state |= SET_DEQ_PENDING;
602 }
603
604 static void xhci_stop_watchdog_timer_in_irq(struct xhci_hcd *xhci,
605                 struct xhci_virt_ep *ep)
606 {
607         ep->ep_state &= ~EP_HALT_PENDING;
608         /* Can't del_timer_sync in interrupt, so we attempt to cancel.  If the
609          * timer is running on another CPU, we don't decrement stop_cmds_pending
610          * (since we didn't successfully stop the watchdog timer).
611          */
612         if (del_timer(&ep->stop_cmd_timer))
613                 ep->stop_cmds_pending--;
614 }
615
616 /* Must be called with xhci->lock held in interrupt context */
617 static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci,
618                 struct xhci_td *cur_td, int status, char *adjective)
619 {
620         struct usb_hcd *hcd;
621         struct urb      *urb;
622         struct urb_priv *urb_priv;
623
624         urb = cur_td->urb;
625         urb_priv = urb->hcpriv;
626         urb_priv->td_cnt++;
627         hcd = bus_to_hcd(urb->dev->bus);
628
629         /* Only giveback urb when this is the last td in urb */
630         if (urb_priv->td_cnt == urb_priv->length) {
631                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
632                         xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
633                         if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) {
634                                 if (xhci->quirks & XHCI_AMD_PLL_FIX)
635                                         usb_amd_quirk_pll_enable();
636                         }
637                 }
638                 usb_hcd_unlink_urb_from_ep(hcd, urb);
639                 xhci_dbg(xhci, "Giveback %s URB %p\n", adjective, urb);
640
641                 spin_unlock(&xhci->lock);
642                 usb_hcd_giveback_urb(hcd, urb, status);
643                 xhci_urb_free_priv(xhci, urb_priv);
644                 spin_lock(&xhci->lock);
645                 xhci_dbg(xhci, "%s URB given back\n", adjective);
646         }
647 }
648
649 /*
650  * When we get a command completion for a Stop Endpoint Command, we need to
651  * unlink any cancelled TDs from the ring.  There are two ways to do that:
652  *
653  *  1. If the HW was in the middle of processing the TD that needs to be
654  *     cancelled, then we must move the ring's dequeue pointer past the last TRB
655  *     in the TD with a Set Dequeue Pointer Command.
656  *  2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain
657  *     bit cleared) so that the HW will skip over them.
658  */
659 static void handle_stopped_endpoint(struct xhci_hcd *xhci,
660                 union xhci_trb *trb, struct xhci_event_cmd *event)
661 {
662         unsigned int slot_id;
663         unsigned int ep_index;
664         struct xhci_virt_device *virt_dev;
665         struct xhci_ring *ep_ring;
666         struct xhci_virt_ep *ep;
667         struct list_head *entry;
668         struct xhci_td *cur_td = NULL;
669         struct xhci_td *last_unlinked_td;
670
671         struct xhci_dequeue_state deq_state;
672
673         if (unlikely(TRB_TO_SUSPEND_PORT(
674                              le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])))) {
675                 slot_id = TRB_TO_SLOT_ID(
676                         le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
677                 virt_dev = xhci->devs[slot_id];
678                 if (virt_dev)
679                         handle_cmd_in_cmd_wait_list(xhci, virt_dev,
680                                 event);
681                 else
682                         xhci_warn(xhci, "Stop endpoint command "
683                                 "completion for disabled slot %u\n",
684                                 slot_id);
685                 return;
686         }
687
688         memset(&deq_state, 0, sizeof(deq_state));
689         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
690         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
691         ep = &xhci->devs[slot_id]->eps[ep_index];
692
693         if (list_empty(&ep->cancelled_td_list)) {
694                 xhci_stop_watchdog_timer_in_irq(xhci, ep);
695                 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
696                 return;
697         }
698
699         /* Fix up the ep ring first, so HW stops executing cancelled TDs.
700          * We have the xHCI lock, so nothing can modify this list until we drop
701          * it.  We're also in the event handler, so we can't get re-interrupted
702          * if another Stop Endpoint command completes
703          */
704         list_for_each(entry, &ep->cancelled_td_list) {
705                 cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
706                 xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
707                                 cur_td->first_trb,
708                                 (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb));
709                 ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb);
710                 if (!ep_ring) {
711                         /* This shouldn't happen unless a driver is mucking
712                          * with the stream ID after submission.  This will
713                          * leave the TD on the hardware ring, and the hardware
714                          * will try to execute it, and may access a buffer
715                          * that has already been freed.  In the best case, the
716                          * hardware will execute it, and the event handler will
717                          * ignore the completion event for that TD, since it was
718                          * removed from the td_list for that endpoint.  In
719                          * short, don't muck with the stream ID after
720                          * submission.
721                          */
722                         xhci_warn(xhci, "WARN Cancelled URB %p "
723                                         "has invalid stream ID %u.\n",
724                                         cur_td->urb,
725                                         cur_td->urb->stream_id);
726                         goto remove_finished_td;
727                 }
728                 /*
729                  * If we stopped on the TD we need to cancel, then we have to
730                  * move the xHC endpoint ring dequeue pointer past this TD.
731                  */
732                 if (cur_td == ep->stopped_td)
733                         xhci_find_new_dequeue_state(xhci, slot_id, ep_index,
734                                         cur_td->urb->stream_id,
735                                         cur_td, &deq_state);
736                 else
737                         td_to_noop(xhci, ep_ring, cur_td);
738 remove_finished_td:
739                 /*
740                  * The event handler won't see a completion for this TD anymore,
741                  * so remove it from the endpoint ring's TD list.  Keep it in
742                  * the cancelled TD list for URB completion later.
743                  */
744                 list_del(&cur_td->td_list);
745         }
746         last_unlinked_td = cur_td;
747         xhci_stop_watchdog_timer_in_irq(xhci, ep);
748
749         /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
750         if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
751                 xhci_queue_new_dequeue_state(xhci,
752                                 slot_id, ep_index,
753                                 ep->stopped_td->urb->stream_id,
754                                 &deq_state);
755                 xhci_ring_cmd_db(xhci);
756         } else {
757                 /* Otherwise ring the doorbell(s) to restart queued transfers */
758                 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
759         }
760         ep->stopped_td = NULL;
761         ep->stopped_trb = NULL;
762
763         /*
764          * Drop the lock and complete the URBs in the cancelled TD list.
765          * New TDs to be cancelled might be added to the end of the list before
766          * we can complete all the URBs for the TDs we already unlinked.
767          * So stop when we've completed the URB for the last TD we unlinked.
768          */
769         do {
770                 cur_td = list_entry(ep->cancelled_td_list.next,
771                                 struct xhci_td, cancelled_td_list);
772                 list_del(&cur_td->cancelled_td_list);
773
774                 /* Clean up the cancelled URB */
775                 /* Doesn't matter what we pass for status, since the core will
776                  * just overwrite it (because the URB has been unlinked).
777                  */
778                 xhci_giveback_urb_in_irq(xhci, cur_td, 0, "cancelled");
779
780                 /* Stop processing the cancelled list if the watchdog timer is
781                  * running.
782                  */
783                 if (xhci->xhc_state & XHCI_STATE_DYING)
784                         return;
785         } while (cur_td != last_unlinked_td);
786
787         /* Return to the event handler with xhci->lock re-acquired */
788 }
789
790 /* Watchdog timer function for when a stop endpoint command fails to complete.
791  * In this case, we assume the host controller is broken or dying or dead.  The
792  * host may still be completing some other events, so we have to be careful to
793  * let the event ring handler and the URB dequeueing/enqueueing functions know
794  * through xhci->state.
795  *
796  * The timer may also fire if the host takes a very long time to respond to the
797  * command, and the stop endpoint command completion handler cannot delete the
798  * timer before the timer function is called.  Another endpoint cancellation may
799  * sneak in before the timer function can grab the lock, and that may queue
800  * another stop endpoint command and add the timer back.  So we cannot use a
801  * simple flag to say whether there is a pending stop endpoint command for a
802  * particular endpoint.
803  *
804  * Instead we use a combination of that flag and a counter for the number of
805  * pending stop endpoint commands.  If the timer is the tail end of the last
806  * stop endpoint command, and the endpoint's command is still pending, we assume
807  * the host is dying.
808  */
809 void xhci_stop_endpoint_command_watchdog(unsigned long arg)
810 {
811         struct xhci_hcd *xhci;
812         struct xhci_virt_ep *ep;
813         struct xhci_virt_ep *temp_ep;
814         struct xhci_ring *ring;
815         struct xhci_td *cur_td;
816         int ret, i, j;
817
818         ep = (struct xhci_virt_ep *) arg;
819         xhci = ep->xhci;
820
821         spin_lock(&xhci->lock);
822
823         ep->stop_cmds_pending--;
824         if (xhci->xhc_state & XHCI_STATE_DYING) {
825                 xhci_dbg(xhci, "Stop EP timer ran, but another timer marked "
826                                 "xHCI as DYING, exiting.\n");
827                 spin_unlock(&xhci->lock);
828                 return;
829         }
830         if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
831                 xhci_dbg(xhci, "Stop EP timer ran, but no command pending, "
832                                 "exiting.\n");
833                 spin_unlock(&xhci->lock);
834                 return;
835         }
836
837         xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
838         xhci_warn(xhci, "Assuming host is dying, halting host.\n");
839         /* Oops, HC is dead or dying or at least not responding to the stop
840          * endpoint command.
841          */
842         xhci->xhc_state |= XHCI_STATE_DYING;
843         /* Disable interrupts from the host controller and start halting it */
844         xhci_quiesce(xhci);
845         spin_unlock(&xhci->lock);
846
847         ret = xhci_halt(xhci);
848
849         spin_lock(&xhci->lock);
850         if (ret < 0) {
851                 /* This is bad; the host is not responding to commands and it's
852                  * not allowing itself to be halted.  At least interrupts are
853                  * disabled. If we call usb_hc_died(), it will attempt to
854                  * disconnect all device drivers under this host.  Those
855                  * disconnect() methods will wait for all URBs to be unlinked,
856                  * so we must complete them.
857                  */
858                 xhci_warn(xhci, "Non-responsive xHCI host is not halting.\n");
859                 xhci_warn(xhci, "Completing active URBs anyway.\n");
860                 /* We could turn all TDs on the rings to no-ops.  This won't
861                  * help if the host has cached part of the ring, and is slow if
862                  * we want to preserve the cycle bit.  Skip it and hope the host
863                  * doesn't touch the memory.
864                  */
865         }
866         for (i = 0; i < MAX_HC_SLOTS; i++) {
867                 if (!xhci->devs[i])
868                         continue;
869                 for (j = 0; j < 31; j++) {
870                         temp_ep = &xhci->devs[i]->eps[j];
871                         ring = temp_ep->ring;
872                         if (!ring)
873                                 continue;
874                         xhci_dbg(xhci, "Killing URBs for slot ID %u, "
875                                         "ep index %u\n", i, j);
876                         while (!list_empty(&ring->td_list)) {
877                                 cur_td = list_first_entry(&ring->td_list,
878                                                 struct xhci_td,
879                                                 td_list);
880                                 list_del(&cur_td->td_list);
881                                 if (!list_empty(&cur_td->cancelled_td_list))
882                                         list_del(&cur_td->cancelled_td_list);
883                                 xhci_giveback_urb_in_irq(xhci, cur_td,
884                                                 -ESHUTDOWN, "killed");
885                         }
886                         while (!list_empty(&temp_ep->cancelled_td_list)) {
887                                 cur_td = list_first_entry(
888                                                 &temp_ep->cancelled_td_list,
889                                                 struct xhci_td,
890                                                 cancelled_td_list);
891                                 list_del(&cur_td->cancelled_td_list);
892                                 xhci_giveback_urb_in_irq(xhci, cur_td,
893                                                 -ESHUTDOWN, "killed");
894                         }
895                 }
896         }
897         spin_unlock(&xhci->lock);
898         xhci_dbg(xhci, "Calling usb_hc_died()\n");
899         usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
900         xhci_dbg(xhci, "xHCI host controller is dead.\n");
901 }
902
903 /*
904  * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
905  * we need to clear the set deq pending flag in the endpoint ring state, so that
906  * the TD queueing code can ring the doorbell again.  We also need to ring the
907  * endpoint doorbell to restart the ring, but only if there aren't more
908  * cancellations pending.
909  */
910 static void handle_set_deq_completion(struct xhci_hcd *xhci,
911                 struct xhci_event_cmd *event,
912                 union xhci_trb *trb)
913 {
914         unsigned int slot_id;
915         unsigned int ep_index;
916         unsigned int stream_id;
917         struct xhci_ring *ep_ring;
918         struct xhci_virt_device *dev;
919         struct xhci_ep_ctx *ep_ctx;
920         struct xhci_slot_ctx *slot_ctx;
921
922         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
923         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
924         stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2]));
925         dev = xhci->devs[slot_id];
926
927         ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id);
928         if (!ep_ring) {
929                 xhci_warn(xhci, "WARN Set TR deq ptr command for "
930                                 "freed stream ID %u\n",
931                                 stream_id);
932                 /* XXX: Harmless??? */
933                 dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
934                 return;
935         }
936
937         ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
938         slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
939
940         if (GET_COMP_CODE(le32_to_cpu(event->status)) != COMP_SUCCESS) {
941                 unsigned int ep_state;
942                 unsigned int slot_state;
943
944                 switch (GET_COMP_CODE(le32_to_cpu(event->status))) {
945                 case COMP_TRB_ERR:
946                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because "
947                                         "of stream ID configuration\n");
948                         break;
949                 case COMP_CTX_STATE:
950                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due "
951                                         "to incorrect slot or ep state.\n");
952                         ep_state = le32_to_cpu(ep_ctx->ep_info);
953                         ep_state &= EP_STATE_MASK;
954                         slot_state = le32_to_cpu(slot_ctx->dev_state);
955                         slot_state = GET_SLOT_STATE(slot_state);
956                         xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
957                                         slot_state, ep_state);
958                         break;
959                 case COMP_EBADSLT:
960                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because "
961                                         "slot %u was not enabled.\n", slot_id);
962                         break;
963                 default:
964                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown "
965                                         "completion code of %u.\n",
966                                   GET_COMP_CODE(le32_to_cpu(event->status)));
967                         break;
968                 }
969                 /* OK what do we do now?  The endpoint state is hosed, and we
970                  * should never get to this point if the synchronization between
971                  * queueing, and endpoint state are correct.  This might happen
972                  * if the device gets disconnected after we've finished
973                  * cancelling URBs, which might not be an error...
974                  */
975         } else {
976                 xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
977                          le64_to_cpu(ep_ctx->deq));
978                 if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg,
979                                          dev->eps[ep_index].queued_deq_ptr) ==
980                     (le64_to_cpu(ep_ctx->deq) & ~(EP_CTX_CYCLE_MASK))) {
981                         /* Update the ring's dequeue segment and dequeue pointer
982                          * to reflect the new position.
983                          */
984                         ep_ring->deq_seg = dev->eps[ep_index].queued_deq_seg;
985                         ep_ring->dequeue = dev->eps[ep_index].queued_deq_ptr;
986                 } else {
987                         xhci_warn(xhci, "Mismatch between completed Set TR Deq "
988                                         "Ptr command & xHCI internal state.\n");
989                         xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n",
990                                         dev->eps[ep_index].queued_deq_seg,
991                                         dev->eps[ep_index].queued_deq_ptr);
992                 }
993         }
994
995         dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
996         dev->eps[ep_index].queued_deq_seg = NULL;
997         dev->eps[ep_index].queued_deq_ptr = NULL;
998         /* Restart any rings with pending URBs */
999         ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1000 }
1001
1002 static void handle_reset_ep_completion(struct xhci_hcd *xhci,
1003                 struct xhci_event_cmd *event,
1004                 union xhci_trb *trb)
1005 {
1006         int slot_id;
1007         unsigned int ep_index;
1008
1009         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
1010         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
1011         /* This command will only fail if the endpoint wasn't halted,
1012          * but we don't care.
1013          */
1014         xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
1015                  (unsigned int) GET_COMP_CODE(le32_to_cpu(event->status)));
1016
1017         /* HW with the reset endpoint quirk needs to have a configure endpoint
1018          * command complete before the endpoint can be used.  Queue that here
1019          * because the HW can't handle two commands being queued in a row.
1020          */
1021         if (xhci->quirks & XHCI_RESET_EP_QUIRK) {
1022                 xhci_dbg(xhci, "Queueing configure endpoint command\n");
1023                 xhci_queue_configure_endpoint(xhci,
1024                                 xhci->devs[slot_id]->in_ctx->dma, slot_id,
1025                                 false);
1026                 xhci_ring_cmd_db(xhci);
1027         } else {
1028                 /* Clear our internal halted state and restart the ring(s) */
1029                 xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED;
1030                 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1031         }
1032 }
1033
1034 /* Check to see if a command in the device's command queue matches this one.
1035  * Signal the completion or free the command, and return 1.  Return 0 if the
1036  * completed command isn't at the head of the command list.
1037  */
1038 static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
1039                 struct xhci_virt_device *virt_dev,
1040                 struct xhci_event_cmd *event)
1041 {
1042         struct xhci_command *command;
1043
1044         if (list_empty(&virt_dev->cmd_list))
1045                 return 0;
1046
1047         command = list_entry(virt_dev->cmd_list.next,
1048                         struct xhci_command, cmd_list);
1049         if (xhci->cmd_ring->dequeue != command->command_trb)
1050                 return 0;
1051
1052         command->status = GET_COMP_CODE(le32_to_cpu(event->status));
1053         list_del(&command->cmd_list);
1054         if (command->completion)
1055                 complete(command->completion);
1056         else
1057                 xhci_free_command(xhci, command);
1058         return 1;
1059 }
1060
1061 static void handle_cmd_completion(struct xhci_hcd *xhci,
1062                 struct xhci_event_cmd *event)
1063 {
1064         int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1065         u64 cmd_dma;
1066         dma_addr_t cmd_dequeue_dma;
1067         struct xhci_input_control_ctx *ctrl_ctx;
1068         struct xhci_virt_device *virt_dev;
1069         unsigned int ep_index;
1070         struct xhci_ring *ep_ring;
1071         unsigned int ep_state;
1072
1073         cmd_dma = le64_to_cpu(event->cmd_trb);
1074         cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
1075                         xhci->cmd_ring->dequeue);
1076         /* Is the command ring deq ptr out of sync with the deq seg ptr? */
1077         if (cmd_dequeue_dma == 0) {
1078                 xhci->error_bitmask |= 1 << 4;
1079                 return;
1080         }
1081         /* Does the DMA address match our internal dequeue pointer address? */
1082         if (cmd_dma != (u64) cmd_dequeue_dma) {
1083                 xhci->error_bitmask |= 1 << 5;
1084                 return;
1085         }
1086         switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])
1087                 & TRB_TYPE_BITMASK) {
1088         case TRB_TYPE(TRB_ENABLE_SLOT):
1089                 if (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_SUCCESS)
1090                         xhci->slot_id = slot_id;
1091                 else
1092                         xhci->slot_id = 0;
1093                 complete(&xhci->addr_dev);
1094                 break;
1095         case TRB_TYPE(TRB_DISABLE_SLOT):
1096                 if (xhci->devs[slot_id])
1097                         xhci_free_virt_device(xhci, slot_id);
1098                 break;
1099         case TRB_TYPE(TRB_CONFIG_EP):
1100                 virt_dev = xhci->devs[slot_id];
1101                 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1102                         break;
1103                 /*
1104                  * Configure endpoint commands can come from the USB core
1105                  * configuration or alt setting changes, or because the HW
1106                  * needed an extra configure endpoint command after a reset
1107                  * endpoint command or streams were being configured.
1108                  * If the command was for a halted endpoint, the xHCI driver
1109                  * is not waiting on the configure endpoint command.
1110                  */
1111                 ctrl_ctx = xhci_get_input_control_ctx(xhci,
1112                                 virt_dev->in_ctx);
1113                 /* Input ctx add_flags are the endpoint index plus one */
1114                 ep_index = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags)) - 1;
1115                 /* A usb_set_interface() call directly after clearing a halted
1116                  * condition may race on this quirky hardware.  Not worth
1117                  * worrying about, since this is prototype hardware.  Not sure
1118                  * if this will work for streams, but streams support was
1119                  * untested on this prototype.
1120                  */
1121                 if (xhci->quirks & XHCI_RESET_EP_QUIRK &&
1122                                 ep_index != (unsigned int) -1 &&
1123                     le32_to_cpu(ctrl_ctx->add_flags) - SLOT_FLAG ==
1124                     le32_to_cpu(ctrl_ctx->drop_flags)) {
1125                         ep_ring = xhci->devs[slot_id]->eps[ep_index].ring;
1126                         ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
1127                         if (!(ep_state & EP_HALTED))
1128                                 goto bandwidth_change;
1129                         xhci_dbg(xhci, "Completed config ep cmd - "
1130                                         "last ep index = %d, state = %d\n",
1131                                         ep_index, ep_state);
1132                         /* Clear internal halted state and restart ring(s) */
1133                         xhci->devs[slot_id]->eps[ep_index].ep_state &=
1134                                 ~EP_HALTED;
1135                         ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1136                         break;
1137                 }
1138 bandwidth_change:
1139                 xhci_dbg(xhci, "Completed config ep cmd\n");
1140                 xhci->devs[slot_id]->cmd_status =
1141                         GET_COMP_CODE(le32_to_cpu(event->status));
1142                 complete(&xhci->devs[slot_id]->cmd_completion);
1143                 break;
1144         case TRB_TYPE(TRB_EVAL_CONTEXT):
1145                 virt_dev = xhci->devs[slot_id];
1146                 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1147                         break;
1148                 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1149                 complete(&xhci->devs[slot_id]->cmd_completion);
1150                 break;
1151         case TRB_TYPE(TRB_ADDR_DEV):
1152                 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1153                 complete(&xhci->addr_dev);
1154                 break;
1155         case TRB_TYPE(TRB_STOP_RING):
1156                 handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue, event);
1157                 break;
1158         case TRB_TYPE(TRB_SET_DEQ):
1159                 handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
1160                 break;
1161         case TRB_TYPE(TRB_CMD_NOOP):
1162                 break;
1163         case TRB_TYPE(TRB_RESET_EP):
1164                 handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue);
1165                 break;
1166         case TRB_TYPE(TRB_RESET_DEV):
1167                 xhci_dbg(xhci, "Completed reset device command.\n");
1168                 slot_id = TRB_TO_SLOT_ID(
1169                         le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
1170                 virt_dev = xhci->devs[slot_id];
1171                 if (virt_dev)
1172                         handle_cmd_in_cmd_wait_list(xhci, virt_dev, event);
1173                 else
1174                         xhci_warn(xhci, "Reset device command completion "
1175                                         "for disabled slot %u\n", slot_id);
1176                 break;
1177         case TRB_TYPE(TRB_NEC_GET_FW):
1178                 if (!(xhci->quirks & XHCI_NEC_HOST)) {
1179                         xhci->error_bitmask |= 1 << 6;
1180                         break;
1181                 }
1182                 xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
1183                          NEC_FW_MAJOR(le32_to_cpu(event->status)),
1184                          NEC_FW_MINOR(le32_to_cpu(event->status)));
1185                 break;
1186         default:
1187                 /* Skip over unknown commands on the event ring */
1188                 xhci->error_bitmask |= 1 << 6;
1189                 break;
1190         }
1191         inc_deq(xhci, xhci->cmd_ring, false);
1192 }
1193
1194 static void handle_vendor_event(struct xhci_hcd *xhci,
1195                 union xhci_trb *event)
1196 {
1197         u32 trb_type;
1198
1199         trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3]));
1200         xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type);
1201         if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST))
1202                 handle_cmd_completion(xhci, &event->event_cmd);
1203 }
1204
1205 /* @port_id: the one-based port ID from the hardware (indexed from array of all
1206  * port registers -- USB 3.0 and USB 2.0).
1207  *
1208  * Returns a zero-based port number, which is suitable for indexing into each of
1209  * the split roothubs' port arrays and bus state arrays.
1210  */
1211 static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd,
1212                 struct xhci_hcd *xhci, u32 port_id)
1213 {
1214         unsigned int i;
1215         unsigned int num_similar_speed_ports = 0;
1216
1217         /* port_id from the hardware is 1-based, but port_array[], usb3_ports[],
1218          * and usb2_ports are 0-based indexes.  Count the number of similar
1219          * speed ports, up to 1 port before this port.
1220          */
1221         for (i = 0; i < (port_id - 1); i++) {
1222                 u8 port_speed = xhci->port_array[i];
1223
1224                 /*
1225                  * Skip ports that don't have known speeds, or have duplicate
1226                  * Extended Capabilities port speed entries.
1227                  */
1228                 if (port_speed == 0 || port_speed == DUPLICATE_ENTRY)
1229                         continue;
1230
1231                 /*
1232                  * USB 3.0 ports are always under a USB 3.0 hub.  USB 2.0 and
1233                  * 1.1 ports are under the USB 2.0 hub.  If the port speed
1234                  * matches the device speed, it's a similar speed port.
1235                  */
1236                 if ((port_speed == 0x03) == (hcd->speed == HCD_USB3))
1237                         num_similar_speed_ports++;
1238         }
1239         return num_similar_speed_ports;
1240 }
1241
1242 static void handle_port_status(struct xhci_hcd *xhci,
1243                 union xhci_trb *event)
1244 {
1245         struct usb_hcd *hcd;
1246         u32 port_id;
1247         u32 temp, temp1;
1248         int max_ports;
1249         int slot_id;
1250         unsigned int faked_port_index;
1251         u8 major_revision;
1252         struct xhci_bus_state *bus_state;
1253         __le32 __iomem **port_array;
1254         bool bogus_port_status = false;
1255
1256         /* Port status change events always have a successful completion code */
1257         if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) {
1258                 xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
1259                 xhci->error_bitmask |= 1 << 8;
1260         }
1261         port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0]));
1262         xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
1263
1264         max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
1265         if ((port_id <= 0) || (port_id > max_ports)) {
1266                 xhci_warn(xhci, "Invalid port id %d\n", port_id);
1267                 bogus_port_status = true;
1268                 goto cleanup;
1269         }
1270
1271         /* Figure out which usb_hcd this port is attached to:
1272          * is it a USB 3.0 port or a USB 2.0/1.1 port?
1273          */
1274         major_revision = xhci->port_array[port_id - 1];
1275         if (major_revision == 0) {
1276                 xhci_warn(xhci, "Event for port %u not in "
1277                                 "Extended Capabilities, ignoring.\n",
1278                                 port_id);
1279                 bogus_port_status = true;
1280                 goto cleanup;
1281         }
1282         if (major_revision == DUPLICATE_ENTRY) {
1283                 xhci_warn(xhci, "Event for port %u duplicated in"
1284                                 "Extended Capabilities, ignoring.\n",
1285                                 port_id);
1286                 bogus_port_status = true;
1287                 goto cleanup;
1288         }
1289
1290         /*
1291          * Hardware port IDs reported by a Port Status Change Event include USB
1292          * 3.0 and USB 2.0 ports.  We want to check if the port has reported a
1293          * resume event, but we first need to translate the hardware port ID
1294          * into the index into the ports on the correct split roothub, and the
1295          * correct bus_state structure.
1296          */
1297         /* Find the right roothub. */
1298         hcd = xhci_to_hcd(xhci);
1299         if ((major_revision == 0x03) != (hcd->speed == HCD_USB3))
1300                 hcd = xhci->shared_hcd;
1301         bus_state = &xhci->bus_state[hcd_index(hcd)];
1302         if (hcd->speed == HCD_USB3)
1303                 port_array = xhci->usb3_ports;
1304         else
1305                 port_array = xhci->usb2_ports;
1306         /* Find the faked port hub number */
1307         faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci,
1308                         port_id);
1309
1310         temp = xhci_readl(xhci, port_array[faked_port_index]);
1311         if (hcd->state == HC_STATE_SUSPENDED) {
1312                 xhci_dbg(xhci, "resume root hub\n");
1313                 usb_hcd_resume_root_hub(hcd);
1314         }
1315
1316         if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) {
1317                 xhci_dbg(xhci, "port resume event for port %d\n", port_id);
1318
1319                 temp1 = xhci_readl(xhci, &xhci->op_regs->command);
1320                 if (!(temp1 & CMD_RUN)) {
1321                         xhci_warn(xhci, "xHC is not running.\n");
1322                         goto cleanup;
1323                 }
1324
1325                 if (DEV_SUPERSPEED(temp)) {
1326                         xhci_dbg(xhci, "resume SS port %d\n", port_id);
1327                         temp = xhci_port_state_to_neutral(temp);
1328                         temp &= ~PORT_PLS_MASK;
1329                         temp |= PORT_LINK_STROBE | XDEV_U0;
1330                         xhci_writel(xhci, temp, port_array[faked_port_index]);
1331                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1332                                         faked_port_index);
1333                         if (!slot_id) {
1334                                 xhci_dbg(xhci, "slot_id is zero\n");
1335                                 goto cleanup;
1336                         }
1337                         xhci_ring_device(xhci, slot_id);
1338                         xhci_dbg(xhci, "resume SS port %d finished\n", port_id);
1339                         /* Clear PORT_PLC */
1340                         temp = xhci_readl(xhci, port_array[faked_port_index]);
1341                         temp = xhci_port_state_to_neutral(temp);
1342                         temp |= PORT_PLC;
1343                         xhci_writel(xhci, temp, port_array[faked_port_index]);
1344                 } else {
1345                         xhci_dbg(xhci, "resume HS port %d\n", port_id);
1346                         bus_state->resume_done[faked_port_index] = jiffies +
1347                                 msecs_to_jiffies(20);
1348                         mod_timer(&hcd->rh_timer,
1349                                   bus_state->resume_done[faked_port_index]);
1350                         /* Do the rest in GetPortStatus */
1351                 }
1352         }
1353
1354 cleanup:
1355         /* Update event ring dequeue pointer before dropping the lock */
1356         inc_deq(xhci, xhci->event_ring, true);
1357
1358         /* Don't make the USB core poll the roothub if we got a bad port status
1359          * change event.  Besides, at that point we can't tell which roothub
1360          * (USB 2.0 or USB 3.0) to kick.
1361          */
1362         if (bogus_port_status)
1363                 return;
1364
1365         spin_unlock(&xhci->lock);
1366         /* Pass this up to the core */
1367         usb_hcd_poll_rh_status(hcd);
1368         spin_lock(&xhci->lock);
1369 }
1370
1371 /*
1372  * This TD is defined by the TRBs starting at start_trb in start_seg and ending
1373  * at end_trb, which may be in another segment.  If the suspect DMA address is a
1374  * TRB in this TD, this function returns that TRB's segment.  Otherwise it
1375  * returns 0.
1376  */
1377 struct xhci_segment *trb_in_td(struct xhci_segment *start_seg,
1378                 union xhci_trb  *start_trb,
1379                 union xhci_trb  *end_trb,
1380                 dma_addr_t      suspect_dma)
1381 {
1382         dma_addr_t start_dma;
1383         dma_addr_t end_seg_dma;
1384         dma_addr_t end_trb_dma;
1385         struct xhci_segment *cur_seg;
1386
1387         start_dma = xhci_trb_virt_to_dma(start_seg, start_trb);
1388         cur_seg = start_seg;
1389
1390         do {
1391                 if (start_dma == 0)
1392                         return NULL;
1393                 /* We may get an event for a Link TRB in the middle of a TD */
1394                 end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
1395                                 &cur_seg->trbs[TRBS_PER_SEGMENT - 1]);
1396                 /* If the end TRB isn't in this segment, this is set to 0 */
1397                 end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
1398
1399                 if (end_trb_dma > 0) {
1400                         /* The end TRB is in this segment, so suspect should be here */
1401                         if (start_dma <= end_trb_dma) {
1402                                 if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma)
1403                                         return cur_seg;
1404                         } else {
1405                                 /* Case for one segment with
1406                                  * a TD wrapped around to the top
1407                                  */
1408                                 if ((suspect_dma >= start_dma &&
1409                                                         suspect_dma <= end_seg_dma) ||
1410                                                 (suspect_dma >= cur_seg->dma &&
1411                                                  suspect_dma <= end_trb_dma))
1412                                         return cur_seg;
1413                         }
1414                         return NULL;
1415                 } else {
1416                         /* Might still be somewhere in this segment */
1417                         if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma)
1418                                 return cur_seg;
1419                 }
1420                 cur_seg = cur_seg->next;
1421                 start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
1422         } while (cur_seg != start_seg);
1423
1424         return NULL;
1425 }
1426
1427 static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
1428                 unsigned int slot_id, unsigned int ep_index,
1429                 unsigned int stream_id,
1430                 struct xhci_td *td, union xhci_trb *event_trb)
1431 {
1432         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
1433         ep->ep_state |= EP_HALTED;
1434         ep->stopped_td = td;
1435         ep->stopped_trb = event_trb;
1436         ep->stopped_stream = stream_id;
1437
1438         xhci_queue_reset_ep(xhci, slot_id, ep_index);
1439         xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index);
1440
1441         ep->stopped_td = NULL;
1442         ep->stopped_trb = NULL;
1443         ep->stopped_stream = 0;
1444
1445         xhci_ring_cmd_db(xhci);
1446 }
1447
1448 /* Check if an error has halted the endpoint ring.  The class driver will
1449  * cleanup the halt for a non-default control endpoint if we indicate a stall.
1450  * However, a babble and other errors also halt the endpoint ring, and the class
1451  * driver won't clear the halt in that case, so we need to issue a Set Transfer
1452  * Ring Dequeue Pointer command manually.
1453  */
1454 static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
1455                 struct xhci_ep_ctx *ep_ctx,
1456                 unsigned int trb_comp_code)
1457 {
1458         /* TRB completion codes that may require a manual halt cleanup */
1459         if (trb_comp_code == COMP_TX_ERR ||
1460                         trb_comp_code == COMP_BABBLE ||
1461                         trb_comp_code == COMP_SPLIT_ERR)
1462                 /* The 0.96 spec says a babbling control endpoint
1463                  * is not halted. The 0.96 spec says it is.  Some HW
1464                  * claims to be 0.95 compliant, but it halts the control
1465                  * endpoint anyway.  Check if a babble halted the
1466                  * endpoint.
1467                  */
1468                 if ((le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) == EP_STATE_HALTED)
1469                         return 1;
1470
1471         return 0;
1472 }
1473
1474 int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code)
1475 {
1476         if (trb_comp_code >= 224 && trb_comp_code <= 255) {
1477                 /* Vendor defined "informational" completion code,
1478                  * treat as not-an-error.
1479                  */
1480                 xhci_dbg(xhci, "Vendor defined info completion code %u\n",
1481                                 trb_comp_code);
1482                 xhci_dbg(xhci, "Treating code as success.\n");
1483                 return 1;
1484         }
1485         return 0;
1486 }
1487
1488 /*
1489  * Finish the td processing, remove the td from td list;
1490  * Return 1 if the urb can be given back.
1491  */
1492 static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td,
1493         union xhci_trb *event_trb, struct xhci_transfer_event *event,
1494         struct xhci_virt_ep *ep, int *status, bool skip)
1495 {
1496         struct xhci_virt_device *xdev;
1497         struct xhci_ring *ep_ring;
1498         unsigned int slot_id;
1499         int ep_index;
1500         struct urb *urb = NULL;
1501         struct xhci_ep_ctx *ep_ctx;
1502         int ret = 0;
1503         struct urb_priv *urb_priv;
1504         u32 trb_comp_code;
1505
1506         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1507         xdev = xhci->devs[slot_id];
1508         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1509         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1510         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1511         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1512
1513         if (skip)
1514                 goto td_cleanup;
1515
1516         if (trb_comp_code == COMP_STOP_INVAL ||
1517                         trb_comp_code == COMP_STOP) {
1518                 /* The Endpoint Stop Command completion will take care of any
1519                  * stopped TDs.  A stopped TD may be restarted, so don't update
1520                  * the ring dequeue pointer or take this TD off any lists yet.
1521                  */
1522                 ep->stopped_td = td;
1523                 ep->stopped_trb = event_trb;
1524                 return 0;
1525         } else {
1526                 if (trb_comp_code == COMP_STALL) {
1527                         /* The transfer is completed from the driver's
1528                          * perspective, but we need to issue a set dequeue
1529                          * command for this stalled endpoint to move the dequeue
1530                          * pointer past the TD.  We can't do that here because
1531                          * the halt condition must be cleared first.  Let the
1532                          * USB class driver clear the stall later.
1533                          */
1534                         ep->stopped_td = td;
1535                         ep->stopped_trb = event_trb;
1536                         ep->stopped_stream = ep_ring->stream_id;
1537                 } else if (xhci_requires_manual_halt_cleanup(xhci,
1538                                         ep_ctx, trb_comp_code)) {
1539                         /* Other types of errors halt the endpoint, but the
1540                          * class driver doesn't call usb_reset_endpoint() unless
1541                          * the error is -EPIPE.  Clear the halted status in the
1542                          * xHCI hardware manually.
1543                          */
1544                         xhci_cleanup_halted_endpoint(xhci,
1545                                         slot_id, ep_index, ep_ring->stream_id,
1546                                         td, event_trb);
1547                 } else {
1548                         /* Update ring dequeue pointer */
1549                         while (ep_ring->dequeue != td->last_trb)
1550                                 inc_deq(xhci, ep_ring, false);
1551                         inc_deq(xhci, ep_ring, false);
1552                 }
1553
1554 td_cleanup:
1555                 /* Clean up the endpoint's TD list */
1556                 urb = td->urb;
1557                 urb_priv = urb->hcpriv;
1558
1559                 /* Do one last check of the actual transfer length.
1560                  * If the host controller said we transferred more data than
1561                  * the buffer length, urb->actual_length will be a very big
1562                  * number (since it's unsigned).  Play it safe and say we didn't
1563                  * transfer anything.
1564                  */
1565                 if (urb->actual_length > urb->transfer_buffer_length) {
1566                         xhci_warn(xhci, "URB transfer length is wrong, "
1567                                         "xHC issue? req. len = %u, "
1568                                         "act. len = %u\n",
1569                                         urb->transfer_buffer_length,
1570                                         urb->actual_length);
1571                         urb->actual_length = 0;
1572                         if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1573                                 *status = -EREMOTEIO;
1574                         else
1575                                 *status = 0;
1576                 }
1577                 list_del(&td->td_list);
1578                 /* Was this TD slated to be cancelled but completed anyway? */
1579                 if (!list_empty(&td->cancelled_td_list))
1580                         list_del(&td->cancelled_td_list);
1581
1582                 urb_priv->td_cnt++;
1583                 /* Giveback the urb when all the tds are completed */
1584                 if (urb_priv->td_cnt == urb_priv->length) {
1585                         ret = 1;
1586                         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1587                                 xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
1588                                 if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs
1589                                         == 0) {
1590                                         if (xhci->quirks & XHCI_AMD_PLL_FIX)
1591                                                 usb_amd_quirk_pll_enable();
1592                                 }
1593                         }
1594                 }
1595         }
1596
1597         return ret;
1598 }
1599
1600 /*
1601  * Process control tds, update urb status and actual_length.
1602  */
1603 static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td,
1604         union xhci_trb *event_trb, struct xhci_transfer_event *event,
1605         struct xhci_virt_ep *ep, int *status)
1606 {
1607         struct xhci_virt_device *xdev;
1608         struct xhci_ring *ep_ring;
1609         unsigned int slot_id;
1610         int ep_index;
1611         struct xhci_ep_ctx *ep_ctx;
1612         u32 trb_comp_code;
1613
1614         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1615         xdev = xhci->devs[slot_id];
1616         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1617         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1618         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1619         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1620
1621         xhci_debug_trb(xhci, xhci->event_ring->dequeue);
1622         switch (trb_comp_code) {
1623         case COMP_SUCCESS:
1624                 if (event_trb == ep_ring->dequeue) {
1625                         xhci_warn(xhci, "WARN: Success on ctrl setup TRB "
1626                                         "without IOC set??\n");
1627                         *status = -ESHUTDOWN;
1628                 } else if (event_trb != td->last_trb) {
1629                         xhci_warn(xhci, "WARN: Success on ctrl data TRB "
1630                                         "without IOC set??\n");
1631                         *status = -ESHUTDOWN;
1632                 } else {
1633                         xhci_dbg(xhci, "Successful control transfer!\n");
1634                         *status = 0;
1635                 }
1636                 break;
1637         case COMP_SHORT_TX:
1638                 xhci_warn(xhci, "WARN: short transfer on control ep\n");
1639                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1640                         *status = -EREMOTEIO;
1641                 else
1642                         *status = 0;
1643                 break;
1644         default:
1645                 if (!xhci_requires_manual_halt_cleanup(xhci,
1646                                         ep_ctx, trb_comp_code))
1647                         break;
1648                 xhci_dbg(xhci, "TRB error code %u, "
1649                                 "halted endpoint index = %u\n",
1650                                 trb_comp_code, ep_index);
1651                 /* else fall through */
1652         case COMP_STALL:
1653                 /* Did we transfer part of the data (middle) phase? */
1654                 if (event_trb != ep_ring->dequeue &&
1655                                 event_trb != td->last_trb)
1656                         td->urb->actual_length =
1657                                 td->urb->transfer_buffer_length
1658                                 - TRB_LEN(le32_to_cpu(event->transfer_len));
1659                 else
1660                         td->urb->actual_length = 0;
1661
1662                 xhci_cleanup_halted_endpoint(xhci,
1663                         slot_id, ep_index, 0, td, event_trb);
1664                 return finish_td(xhci, td, event_trb, event, ep, status, true);
1665         }
1666         /*
1667          * Did we transfer any data, despite the errors that might have
1668          * happened?  I.e. did we get past the setup stage?
1669          */
1670         if (event_trb != ep_ring->dequeue) {
1671                 /* The event was for the status stage */
1672                 if (event_trb == td->last_trb) {
1673                         if (td->urb->actual_length != 0) {
1674                                 /* Don't overwrite a previously set error code
1675                                  */
1676                                 if ((*status == -EINPROGRESS || *status == 0) &&
1677                                                 (td->urb->transfer_flags
1678                                                  & URB_SHORT_NOT_OK))
1679                                         /* Did we already see a short data
1680                                          * stage? */
1681                                         *status = -EREMOTEIO;
1682                         } else {
1683                                 td->urb->actual_length =
1684                                         td->urb->transfer_buffer_length;
1685                         }
1686                 } else {
1687                 /* Maybe the event was for the data stage? */
1688                         if (trb_comp_code != COMP_STOP_INVAL) {
1689                                 /* We didn't stop on a link TRB in the middle */
1690                                 td->urb->actual_length =
1691                                         td->urb->transfer_buffer_length -
1692                                         TRB_LEN(le32_to_cpu(event->transfer_len));
1693                                 xhci_dbg(xhci, "Waiting for status "
1694                                                 "stage event\n");
1695                                 return 0;
1696                         }
1697                 }
1698         }
1699
1700         return finish_td(xhci, td, event_trb, event, ep, status, false);
1701 }
1702
1703 /*
1704  * Process isochronous tds, update urb packet status and actual_length.
1705  */
1706 static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
1707         union xhci_trb *event_trb, struct xhci_transfer_event *event,
1708         struct xhci_virt_ep *ep, int *status)
1709 {
1710         struct xhci_ring *ep_ring;
1711         struct urb_priv *urb_priv;
1712         int idx;
1713         int len = 0;
1714         union xhci_trb *cur_trb;
1715         struct xhci_segment *cur_seg;
1716         struct usb_iso_packet_descriptor *frame;
1717         u32 trb_comp_code;
1718         bool skip_td = false;
1719
1720         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1721         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1722         urb_priv = td->urb->hcpriv;
1723         idx = urb_priv->td_cnt;
1724         frame = &td->urb->iso_frame_desc[idx];
1725
1726         /* handle completion code */
1727         switch (trb_comp_code) {
1728         case COMP_SUCCESS:
1729                 frame->status = 0;
1730                 xhci_dbg(xhci, "Successful isoc transfer!\n");
1731                 break;
1732         case COMP_SHORT_TX:
1733                 frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ?
1734                                 -EREMOTEIO : 0;
1735                 break;
1736         case COMP_BW_OVER:
1737                 frame->status = -ECOMM;
1738                 skip_td = true;
1739                 break;
1740         case COMP_BUFF_OVER:
1741         case COMP_BABBLE:
1742                 frame->status = -EOVERFLOW;
1743                 skip_td = true;
1744                 break;
1745         case COMP_STALL:
1746                 frame->status = -EPROTO;
1747                 skip_td = true;
1748                 break;
1749         case COMP_STOP:
1750         case COMP_STOP_INVAL:
1751                 break;
1752         default:
1753                 frame->status = -1;
1754                 break;
1755         }
1756
1757         if (trb_comp_code == COMP_SUCCESS || skip_td) {
1758                 frame->actual_length = frame->length;
1759                 td->urb->actual_length += frame->length;
1760         } else {
1761                 for (cur_trb = ep_ring->dequeue,
1762                      cur_seg = ep_ring->deq_seg; cur_trb != event_trb;
1763                      next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
1764                         if ((le32_to_cpu(cur_trb->generic.field[3]) &
1765                          TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
1766                             (le32_to_cpu(cur_trb->generic.field[3]) &
1767                          TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
1768                                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
1769                 }
1770                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
1771                         TRB_LEN(le32_to_cpu(event->transfer_len));
1772
1773                 if (trb_comp_code != COMP_STOP_INVAL) {
1774                         frame->actual_length = len;
1775                         td->urb->actual_length += len;
1776                 }
1777         }
1778
1779         if ((idx == urb_priv->length - 1) && *status == -EINPROGRESS)
1780                 *status = 0;
1781
1782         return finish_td(xhci, td, event_trb, event, ep, status, false);
1783 }
1784
1785 static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
1786                         struct xhci_transfer_event *event,
1787                         struct xhci_virt_ep *ep, int *status)
1788 {
1789         struct xhci_ring *ep_ring;
1790         struct urb_priv *urb_priv;
1791         struct usb_iso_packet_descriptor *frame;
1792         int idx;
1793
1794         ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
1795         urb_priv = td->urb->hcpriv;
1796         idx = urb_priv->td_cnt;
1797         frame = &td->urb->iso_frame_desc[idx];
1798
1799         /* The transfer is partly done */
1800         *status = -EXDEV;
1801         frame->status = -EXDEV;
1802
1803         /* calc actual length */
1804         frame->actual_length = 0;
1805
1806         /* Update ring dequeue pointer */
1807         while (ep_ring->dequeue != td->last_trb)
1808                 inc_deq(xhci, ep_ring, false);
1809         inc_deq(xhci, ep_ring, false);
1810
1811         return finish_td(xhci, td, NULL, event, ep, status, true);
1812 }
1813
1814 /*
1815  * Process bulk and interrupt tds, update urb status and actual_length.
1816  */
1817 static int process_bulk_intr_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)
1820 {
1821         struct xhci_ring *ep_ring;
1822         union xhci_trb *cur_trb;
1823         struct xhci_segment *cur_seg;
1824         u32 trb_comp_code;
1825
1826         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1827         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1828
1829         switch (trb_comp_code) {
1830         case COMP_SUCCESS:
1831                 /* Double check that the HW transferred everything. */
1832                 if (event_trb != td->last_trb) {
1833                         xhci_warn(xhci, "WARN Successful completion "
1834                                         "on short TX\n");
1835                         if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1836                                 *status = -EREMOTEIO;
1837                         else
1838                                 *status = 0;
1839                 } else {
1840                         if (usb_endpoint_xfer_bulk(&td->urb->ep->desc))
1841                                 xhci_dbg(xhci, "Successful bulk "
1842                                                 "transfer!\n");
1843                         else
1844                                 xhci_dbg(xhci, "Successful interrupt "
1845                                                 "transfer!\n");
1846                         *status = 0;
1847                 }
1848                 break;
1849         case COMP_SHORT_TX:
1850                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1851                         *status = -EREMOTEIO;
1852                 else
1853                         *status = 0;
1854                 break;
1855         default:
1856                 /* Others already handled above */
1857                 break;
1858         }
1859         xhci_dbg(xhci, "ep %#x - asked for %d bytes, "
1860                         "%d bytes untransferred\n",
1861                         td->urb->ep->desc.bEndpointAddress,
1862                         td->urb->transfer_buffer_length,
1863                  TRB_LEN(le32_to_cpu(event->transfer_len)));
1864         /* Fast path - was this the last TRB in the TD for this URB? */
1865         if (event_trb == td->last_trb) {
1866                 if (TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
1867                         td->urb->actual_length =
1868                                 td->urb->transfer_buffer_length -
1869                                 TRB_LEN(le32_to_cpu(event->transfer_len));
1870                         if (td->urb->transfer_buffer_length <
1871                                         td->urb->actual_length) {
1872                                 xhci_warn(xhci, "HC gave bad length "
1873                                                 "of %d bytes left\n",
1874                                           TRB_LEN(le32_to_cpu(event->transfer_len)));
1875                                 td->urb->actual_length = 0;
1876                                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1877                                         *status = -EREMOTEIO;
1878                                 else
1879                                         *status = 0;
1880                         }
1881                         /* Don't overwrite a previously set error code */
1882                         if (*status == -EINPROGRESS) {
1883                                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1884                                         *status = -EREMOTEIO;
1885                                 else
1886                                         *status = 0;
1887                         }
1888                 } else {
1889                         td->urb->actual_length =
1890                                 td->urb->transfer_buffer_length;
1891                         /* Ignore a short packet completion if the
1892                          * untransferred length was zero.
1893                          */
1894                         if (*status == -EREMOTEIO)
1895                                 *status = 0;
1896                 }
1897         } else {
1898                 /* Slow path - walk the list, starting from the dequeue
1899                  * pointer, to get the actual length transferred.
1900                  */
1901                 td->urb->actual_length = 0;
1902                 for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
1903                                 cur_trb != event_trb;
1904                                 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
1905                         if ((le32_to_cpu(cur_trb->generic.field[3]) &
1906                          TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
1907                             (le32_to_cpu(cur_trb->generic.field[3]) &
1908                          TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
1909                                 td->urb->actual_length +=
1910                                         TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
1911                 }
1912                 /* If the ring didn't stop on a Link or No-op TRB, add
1913                  * in the actual bytes transferred from the Normal TRB
1914                  */
1915                 if (trb_comp_code != COMP_STOP_INVAL)
1916                         td->urb->actual_length +=
1917                                 TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
1918                                 TRB_LEN(le32_to_cpu(event->transfer_len));
1919         }
1920
1921         return finish_td(xhci, td, event_trb, event, ep, status, false);
1922 }
1923
1924 /*
1925  * If this function returns an error condition, it means it got a Transfer
1926  * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
1927  * At this point, the host controller is probably hosed and should be reset.
1928  */
1929 static int handle_tx_event(struct xhci_hcd *xhci,
1930                 struct xhci_transfer_event *event)
1931 {
1932         struct xhci_virt_device *xdev;
1933         struct xhci_virt_ep *ep;
1934         struct xhci_ring *ep_ring;
1935         unsigned int slot_id;
1936         int ep_index;
1937         struct xhci_td *td = NULL;
1938         dma_addr_t event_dma;
1939         struct xhci_segment *event_seg;
1940         union xhci_trb *event_trb;
1941         struct urb *urb = NULL;
1942         int status = -EINPROGRESS;
1943         struct urb_priv *urb_priv;
1944         struct xhci_ep_ctx *ep_ctx;
1945         u32 trb_comp_code;
1946         int ret = 0;
1947
1948         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1949         xdev = xhci->devs[slot_id];
1950         if (!xdev) {
1951                 xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
1952                 return -ENODEV;
1953         }
1954
1955         /* Endpoint ID is 1 based, our index is zero based */
1956         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1957         xhci_dbg(xhci, "%s - ep index = %d\n", __func__, ep_index);
1958         ep = &xdev->eps[ep_index];
1959         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1960         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1961         if (!ep_ring ||
1962             (le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) ==
1963             EP_STATE_DISABLED) {
1964                 xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
1965                                 "or incorrect stream ring\n");
1966                 return -ENODEV;
1967         }
1968
1969         event_dma = le64_to_cpu(event->buffer);
1970         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1971         /* Look for common error cases */
1972         switch (trb_comp_code) {
1973         /* Skip codes that require special handling depending on
1974          * transfer type
1975          */
1976         case COMP_SUCCESS:
1977         case COMP_SHORT_TX:
1978                 break;
1979         case COMP_STOP:
1980                 xhci_dbg(xhci, "Stopped on Transfer TRB\n");
1981                 break;
1982         case COMP_STOP_INVAL:
1983                 xhci_dbg(xhci, "Stopped on No-op or Link TRB\n");
1984                 break;
1985         case COMP_STALL:
1986                 xhci_warn(xhci, "WARN: Stalled endpoint\n");
1987                 ep->ep_state |= EP_HALTED;
1988                 status = -EPIPE;
1989                 break;
1990         case COMP_TRB_ERR:
1991                 xhci_warn(xhci, "WARN: TRB error on endpoint\n");
1992                 status = -EILSEQ;
1993                 break;
1994         case COMP_SPLIT_ERR:
1995         case COMP_TX_ERR:
1996                 xhci_warn(xhci, "WARN: transfer error on endpoint\n");
1997                 status = -EPROTO;
1998                 break;
1999         case COMP_BABBLE:
2000                 xhci_warn(xhci, "WARN: babble error on endpoint\n");
2001                 status = -EOVERFLOW;
2002                 break;
2003         case COMP_DB_ERR:
2004                 xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n");
2005                 status = -ENOSR;
2006                 break;
2007         case COMP_BW_OVER:
2008                 xhci_warn(xhci, "WARN: bandwidth overrun event on endpoint\n");
2009                 break;
2010         case COMP_BUFF_OVER:
2011                 xhci_warn(xhci, "WARN: buffer overrun event on endpoint\n");
2012                 break;
2013         case COMP_UNDERRUN:
2014                 /*
2015                  * When the Isoch ring is empty, the xHC will generate
2016                  * a Ring Overrun Event for IN Isoch endpoint or Ring
2017                  * Underrun Event for OUT Isoch endpoint.
2018                  */
2019                 xhci_dbg(xhci, "underrun event on endpoint\n");
2020                 if (!list_empty(&ep_ring->td_list))
2021                         xhci_dbg(xhci, "Underrun Event for slot %d ep %d "
2022                                         "still with TDs queued?\n",
2023                                  TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2024                                  ep_index);
2025                 goto cleanup;
2026         case COMP_OVERRUN:
2027                 xhci_dbg(xhci, "overrun event on endpoint\n");
2028                 if (!list_empty(&ep_ring->td_list))
2029                         xhci_dbg(xhci, "Overrun Event for slot %d ep %d "
2030                                         "still with TDs queued?\n",
2031                                  TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2032                                  ep_index);
2033                 goto cleanup;
2034         case COMP_MISSED_INT:
2035                 /*
2036                  * When encounter missed service error, one or more isoc tds
2037                  * may be missed by xHC.
2038                  * Set skip flag of the ep_ring; Complete the missed tds as
2039                  * short transfer when process the ep_ring next time.
2040                  */
2041                 ep->skip = true;
2042                 xhci_dbg(xhci, "Miss service interval error, set skip flag\n");
2043                 goto cleanup;
2044         default:
2045                 if (xhci_is_vendor_info_code(xhci, trb_comp_code)) {
2046                         status = 0;
2047                         break;
2048                 }
2049                 xhci_warn(xhci, "ERROR Unknown event condition, HC probably "
2050                                 "busted\n");
2051                 goto cleanup;
2052         }
2053
2054         do {
2055                 /* This TRB should be in the TD at the head of this ring's
2056                  * TD list.
2057                  */
2058                 if (list_empty(&ep_ring->td_list)) {
2059                         xhci_warn(xhci, "WARN Event TRB for slot %d ep %d "
2060                                         "with no TDs queued?\n",
2061                                   TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2062                                   ep_index);
2063                         xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
2064                                  (unsigned int) (le32_to_cpu(event->flags)
2065                                                  & TRB_TYPE_BITMASK)>>10);
2066                         xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
2067                         if (ep->skip) {
2068                                 ep->skip = false;
2069                                 xhci_dbg(xhci, "td_list is empty while skip "
2070                                                 "flag set. Clear skip flag.\n");
2071                         }
2072                         ret = 0;
2073                         goto cleanup;
2074                 }
2075
2076                 td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
2077
2078                 /* Is this a TRB in the currently executing TD? */
2079                 event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
2080                                 td->last_trb, event_dma);
2081                 if (!event_seg) {
2082                         if (!ep->skip ||
2083                             !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) {
2084                                 /* HC is busted, give up! */
2085                                 xhci_err(xhci,
2086                                         "ERROR Transfer event TRB DMA ptr not "
2087                                         "part of current TD\n");
2088                                 return -ESHUTDOWN;
2089                         }
2090
2091                         ret = skip_isoc_td(xhci, td, event, ep, &status);
2092                         goto cleanup;
2093                 }
2094
2095                 if (ep->skip) {
2096                         xhci_dbg(xhci, "Found td. Clear skip flag.\n");
2097                         ep->skip = false;
2098                 }
2099
2100                 event_trb = &event_seg->trbs[(event_dma - event_seg->dma) /
2101                                                 sizeof(*event_trb)];
2102                 /*
2103                  * No-op TRB should not trigger interrupts.
2104                  * If event_trb is a no-op TRB, it means the
2105                  * corresponding TD has been cancelled. Just ignore
2106                  * the TD.
2107                  */
2108                 if ((le32_to_cpu(event_trb->generic.field[3])
2109                              & TRB_TYPE_BITMASK)
2110                                  == TRB_TYPE(TRB_TR_NOOP)) {
2111                         xhci_dbg(xhci,
2112                                  "event_trb is a no-op TRB. Skip it\n");
2113                         goto cleanup;
2114                 }
2115
2116                 /* Now update the urb's actual_length and give back to
2117                  * the core
2118                  */
2119                 if (usb_endpoint_xfer_control(&td->urb->ep->desc))
2120                         ret = process_ctrl_td(xhci, td, event_trb, event, ep,
2121                                                  &status);
2122                 else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
2123                         ret = process_isoc_td(xhci, td, event_trb, event, ep,
2124                                                  &status);
2125                 else
2126                         ret = process_bulk_intr_td(xhci, td, event_trb, event,
2127                                                  ep, &status);
2128
2129 cleanup:
2130                 /*
2131                  * Do not update event ring dequeue pointer if ep->skip is set.
2132                  * Will roll back to continue process missed tds.
2133                  */
2134                 if (trb_comp_code == COMP_MISSED_INT || !ep->skip) {
2135                         inc_deq(xhci, xhci->event_ring, true);
2136                 }
2137
2138                 if (ret) {
2139                         urb = td->urb;
2140                         urb_priv = urb->hcpriv;
2141                         /* Leave the TD around for the reset endpoint function
2142                          * to use(but only if it's not a control endpoint,
2143                          * since we already queued the Set TR dequeue pointer
2144                          * command for stalled control endpoints).
2145                          */
2146                         if (usb_endpoint_xfer_control(&urb->ep->desc) ||
2147                                 (trb_comp_code != COMP_STALL &&
2148                                         trb_comp_code != COMP_BABBLE))
2149                                 xhci_urb_free_priv(xhci, urb_priv);
2150
2151                         usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb);
2152                         xhci_dbg(xhci, "Giveback URB %p, len = %d, "
2153                                         "status = %d\n",
2154                                         urb, urb->actual_length, status);
2155                         spin_unlock(&xhci->lock);
2156                         usb_hcd_giveback_urb(bus_to_hcd(urb->dev->bus), urb, status);
2157                         spin_lock(&xhci->lock);
2158                 }
2159
2160         /*
2161          * If ep->skip is set, it means there are missed tds on the
2162          * endpoint ring need to take care of.
2163          * Process them as short transfer until reach the td pointed by
2164          * the event.
2165          */
2166         } while (ep->skip && trb_comp_code != COMP_MISSED_INT);
2167
2168         return 0;
2169 }
2170
2171 /*
2172  * This function handles all OS-owned events on the event ring.  It may drop
2173  * xhci->lock between event processing (e.g. to pass up port status changes).
2174  * Returns >0 for "possibly more events to process" (caller should call again),
2175  * otherwise 0 if done.  In future, <0 returns should indicate error code.
2176  */
2177 static int xhci_handle_event(struct xhci_hcd *xhci)
2178 {
2179         union xhci_trb *event;
2180         int update_ptrs = 1;
2181         int ret;
2182
2183         xhci_dbg(xhci, "In %s\n", __func__);
2184         if (!xhci->event_ring || !xhci->event_ring->dequeue) {
2185                 xhci->error_bitmask |= 1 << 1;
2186                 return 0;
2187         }
2188
2189         event = xhci->event_ring->dequeue;
2190         /* Does the HC or OS own the TRB? */
2191         if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) !=
2192             xhci->event_ring->cycle_state) {
2193                 xhci->error_bitmask |= 1 << 2;
2194                 return 0;
2195         }
2196         xhci_dbg(xhci, "%s - OS owns TRB\n", __func__);
2197
2198         /*
2199          * Barrier between reading the TRB_CYCLE (valid) flag above and any
2200          * speculative reads of the event's flags/data below.
2201          */
2202         rmb();
2203         /* FIXME: Handle more event types. */
2204         switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) {
2205         case TRB_TYPE(TRB_COMPLETION):
2206                 xhci_dbg(xhci, "%s - calling handle_cmd_completion\n", __func__);
2207                 handle_cmd_completion(xhci, &event->event_cmd);
2208                 xhci_dbg(xhci, "%s - returned from handle_cmd_completion\n", __func__);
2209                 break;
2210         case TRB_TYPE(TRB_PORT_STATUS):
2211                 xhci_dbg(xhci, "%s - calling handle_port_status\n", __func__);
2212                 handle_port_status(xhci, event);
2213                 xhci_dbg(xhci, "%s - returned from handle_port_status\n", __func__);
2214                 update_ptrs = 0;
2215                 break;
2216         case TRB_TYPE(TRB_TRANSFER):
2217                 xhci_dbg(xhci, "%s - calling handle_tx_event\n", __func__);
2218                 ret = handle_tx_event(xhci, &event->trans_event);
2219                 xhci_dbg(xhci, "%s - returned from handle_tx_event\n", __func__);
2220                 if (ret < 0)
2221                         xhci->error_bitmask |= 1 << 9;
2222                 else
2223                         update_ptrs = 0;
2224                 break;
2225         default:
2226                 if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >=
2227                     TRB_TYPE(48))
2228                         handle_vendor_event(xhci, event);
2229                 else
2230                         xhci->error_bitmask |= 1 << 3;
2231         }
2232         /* Any of the above functions may drop and re-acquire the lock, so check
2233          * to make sure a watchdog timer didn't mark the host as non-responsive.
2234          */
2235         if (xhci->xhc_state & XHCI_STATE_DYING) {
2236                 xhci_dbg(xhci, "xHCI host dying, returning from "
2237                                 "event handler.\n");
2238                 return 0;
2239         }
2240
2241         if (update_ptrs)
2242                 /* Update SW event ring dequeue pointer */
2243                 inc_deq(xhci, xhci->event_ring, true);
2244
2245         /* Are there more items on the event ring?  Caller will call us again to
2246          * check.
2247          */
2248         return 1;
2249 }
2250
2251 /*
2252  * xHCI spec says we can get an interrupt, and if the HC has an error condition,
2253  * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
2254  * indicators of an event TRB error, but we check the status *first* to be safe.
2255  */
2256 irqreturn_t xhci_irq(struct usb_hcd *hcd)
2257 {
2258         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2259         u32 status;
2260         union xhci_trb *trb;
2261         u64 temp_64;
2262         union xhci_trb *event_ring_deq;
2263         dma_addr_t deq;
2264
2265         spin_lock(&xhci->lock);
2266         trb = xhci->event_ring->dequeue;
2267         /* Check if the xHC generated the interrupt, or the irq is shared */
2268         status = xhci_readl(xhci, &xhci->op_regs->status);
2269         if (status == 0xffffffff)
2270                 goto hw_died;
2271
2272         if (!(status & STS_EINT)) {
2273                 spin_unlock(&xhci->lock);
2274                 return IRQ_NONE;
2275         }
2276         xhci_dbg(xhci, "op reg status = %08x\n", status);
2277         xhci_dbg(xhci, "Event ring dequeue ptr:\n");
2278         xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
2279                  (unsigned long long)
2280                  xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
2281                  lower_32_bits(le64_to_cpu(trb->link.segment_ptr)),
2282                  upper_32_bits(le64_to_cpu(trb->link.segment_ptr)),
2283                  (unsigned int) le32_to_cpu(trb->link.intr_target),
2284                  (unsigned int) le32_to_cpu(trb->link.control));
2285
2286         if (status & STS_FATAL) {
2287                 xhci_warn(xhci, "WARNING: Host System Error\n");
2288                 xhci_halt(xhci);
2289 hw_died:
2290                 spin_unlock(&xhci->lock);
2291                 return -ESHUTDOWN;
2292         }
2293
2294         /*
2295          * Clear the op reg interrupt status first,
2296          * so we can receive interrupts from other MSI-X interrupters.
2297          * Write 1 to clear the interrupt status.
2298          */
2299         status |= STS_EINT;
2300         xhci_writel(xhci, status, &xhci->op_regs->status);
2301         /* FIXME when MSI-X is supported and there are multiple vectors */
2302         /* Clear the MSI-X event interrupt status */
2303
2304         if (hcd->irq != -1) {
2305                 u32 irq_pending;
2306                 /* Acknowledge the PCI interrupt */
2307                 irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
2308                 irq_pending |= 0x3;
2309                 xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending);
2310         }
2311
2312         if (xhci->xhc_state & XHCI_STATE_DYING) {
2313                 xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
2314                                 "Shouldn't IRQs be disabled?\n");
2315                 /* Clear the event handler busy flag (RW1C);
2316                  * the event ring should be empty.
2317                  */
2318                 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2319                 xhci_write_64(xhci, temp_64 | ERST_EHB,
2320                                 &xhci->ir_set->erst_dequeue);
2321                 spin_unlock(&xhci->lock);
2322
2323                 return IRQ_HANDLED;
2324         }
2325
2326         event_ring_deq = xhci->event_ring->dequeue;
2327         /* FIXME this should be a delayed service routine
2328          * that clears the EHB.
2329          */
2330         while (xhci_handle_event(xhci) > 0) {}
2331
2332         temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2333         /* If necessary, update the HW's version of the event ring deq ptr. */
2334         if (event_ring_deq != xhci->event_ring->dequeue) {
2335                 deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
2336                                 xhci->event_ring->dequeue);
2337                 if (deq == 0)
2338                         xhci_warn(xhci, "WARN something wrong with SW event "
2339                                         "ring dequeue ptr.\n");
2340                 /* Update HC event ring dequeue pointer */
2341                 temp_64 &= ERST_PTR_MASK;
2342                 temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK);
2343         }
2344
2345         /* Clear the event handler busy flag (RW1C); event ring is empty. */
2346         temp_64 |= ERST_EHB;
2347         xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue);
2348
2349         spin_unlock(&xhci->lock);
2350
2351         return IRQ_HANDLED;
2352 }
2353
2354 irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
2355 {
2356         irqreturn_t ret;
2357         struct xhci_hcd *xhci;
2358
2359         xhci = hcd_to_xhci(hcd);
2360         set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
2361         if (xhci->shared_hcd)
2362                 set_bit(HCD_FLAG_SAW_IRQ, &xhci->shared_hcd->flags);
2363
2364         ret = xhci_irq(hcd);
2365
2366         return ret;
2367 }
2368
2369 /****           Endpoint Ring Operations        ****/
2370
2371 /*
2372  * Generic function for queueing a TRB on a ring.
2373  * The caller must have checked to make sure there's room on the ring.
2374  *
2375  * @more_trbs_coming:   Will you enqueue more TRBs before calling
2376  *                      prepare_transfer()?
2377  */
2378 static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
2379                 bool consumer, bool more_trbs_coming,
2380                 u32 field1, u32 field2, u32 field3, u32 field4)
2381 {
2382         struct xhci_generic_trb *trb;
2383
2384         trb = &ring->enqueue->generic;
2385         trb->field[0] = cpu_to_le32(field1);
2386         trb->field[1] = cpu_to_le32(field2);
2387         trb->field[2] = cpu_to_le32(field3);
2388         trb->field[3] = cpu_to_le32(field4);
2389         inc_enq(xhci, ring, consumer, more_trbs_coming);
2390 }
2391
2392 /*
2393  * Does various checks on the endpoint ring, and makes it ready to queue num_trbs.
2394  * FIXME allocate segments if the ring is full.
2395  */
2396 static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
2397                 u32 ep_state, unsigned int num_trbs, gfp_t mem_flags)
2398 {
2399         /* Make sure the endpoint has been added to xHC schedule */
2400         xhci_dbg(xhci, "Endpoint state = 0x%x\n", ep_state);
2401         switch (ep_state) {
2402         case EP_STATE_DISABLED:
2403                 /*
2404                  * USB core changed config/interfaces without notifying us,
2405                  * or hardware is reporting the wrong state.
2406                  */
2407                 xhci_warn(xhci, "WARN urb submitted to disabled ep\n");
2408                 return -ENOENT;
2409         case EP_STATE_ERROR:
2410                 xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n");
2411                 /* FIXME event handling code for error needs to clear it */
2412                 /* XXX not sure if this should be -ENOENT or not */
2413                 return -EINVAL;
2414         case EP_STATE_HALTED:
2415                 xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n");
2416         case EP_STATE_STOPPED:
2417         case EP_STATE_RUNNING:
2418                 break;
2419         default:
2420                 xhci_err(xhci, "ERROR unknown endpoint state for ep\n");
2421                 /*
2422                  * FIXME issue Configure Endpoint command to try to get the HC
2423                  * back into a known state.
2424                  */
2425                 return -EINVAL;
2426         }
2427         if (!room_on_ring(xhci, ep_ring, num_trbs)) {
2428                 /* FIXME allocate more room */
2429                 xhci_err(xhci, "ERROR no room on ep ring\n");
2430                 return -ENOMEM;
2431         }
2432
2433         if (enqueue_is_link_trb(ep_ring)) {
2434                 struct xhci_ring *ring = ep_ring;
2435                 union xhci_trb *next;
2436
2437                 xhci_dbg(xhci, "prepare_ring: pointing to link trb\n");
2438                 next = ring->enqueue;
2439
2440                 while (last_trb(xhci, ring, ring->enq_seg, next)) {
2441                         /* If we're not dealing with 0.95 hardware,
2442                          * clear the chain bit.
2443                          */
2444                         if (!xhci_link_trb_quirk(xhci))
2445                                 next->link.control &= cpu_to_le32(~TRB_CHAIN);
2446                         else
2447                                 next->link.control |= cpu_to_le32(TRB_CHAIN);
2448
2449                         wmb();
2450                         next->link.control ^= cpu_to_le32((u32) TRB_CYCLE);
2451
2452                         /* Toggle the cycle bit after the last ring segment. */
2453                         if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
2454                                 ring->cycle_state = (ring->cycle_state ? 0 : 1);
2455                                 if (!in_interrupt()) {
2456                                         xhci_dbg(xhci, "queue_trb: Toggle cycle "
2457                                                 "state for ring %p = %i\n",
2458                                                 ring, (unsigned int)ring->cycle_state);
2459                                 }
2460                         }
2461                         ring->enq_seg = ring->enq_seg->next;
2462                         ring->enqueue = ring->enq_seg->trbs;
2463                         next = ring->enqueue;
2464                 }
2465         }
2466
2467         return 0;
2468 }
2469
2470 static int prepare_transfer(struct xhci_hcd *xhci,
2471                 struct xhci_virt_device *xdev,
2472                 unsigned int ep_index,
2473                 unsigned int stream_id,
2474                 unsigned int num_trbs,
2475                 struct urb *urb,
2476                 unsigned int td_index,
2477                 gfp_t mem_flags)
2478 {
2479         int ret;
2480         struct urb_priv *urb_priv;
2481         struct xhci_td  *td;
2482         struct xhci_ring *ep_ring;
2483         struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
2484
2485         ep_ring = xhci_stream_id_to_ring(xdev, ep_index, stream_id);
2486         if (!ep_ring) {
2487                 xhci_dbg(xhci, "Can't prepare ring for bad stream ID %u\n",
2488                                 stream_id);
2489                 return -EINVAL;
2490         }
2491
2492         ret = prepare_ring(xhci, ep_ring,
2493                            le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK,
2494                            num_trbs, mem_flags);
2495         if (ret)
2496                 return ret;
2497
2498         urb_priv = urb->hcpriv;
2499         td = urb_priv->td[td_index];
2500
2501         INIT_LIST_HEAD(&td->td_list);
2502         INIT_LIST_HEAD(&td->cancelled_td_list);
2503
2504         if (td_index == 0) {
2505                 ret = usb_hcd_link_urb_to_ep(bus_to_hcd(urb->dev->bus), urb);
2506                 if (unlikely(ret)) {
2507                         xhci_urb_free_priv(xhci, urb_priv);
2508                         urb->hcpriv = NULL;
2509                         return ret;
2510                 }
2511         }
2512
2513         td->urb = urb;
2514         /* Add this TD to the tail of the endpoint ring's TD list */
2515         list_add_tail(&td->td_list, &ep_ring->td_list);
2516         td->start_seg = ep_ring->enq_seg;
2517         td->first_trb = ep_ring->enqueue;
2518
2519         urb_priv->td[td_index] = td;
2520
2521         return 0;
2522 }
2523
2524 static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb)
2525 {
2526         int num_sgs, num_trbs, running_total, temp, i;
2527         struct scatterlist *sg;
2528
2529         sg = NULL;
2530         num_sgs = urb->num_sgs;
2531         temp = urb->transfer_buffer_length;
2532
2533         xhci_dbg(xhci, "count sg list trbs: \n");
2534         num_trbs = 0;
2535         for_each_sg(urb->sg, sg, num_sgs, i) {
2536                 unsigned int previous_total_trbs = num_trbs;
2537                 unsigned int len = sg_dma_len(sg);
2538
2539                 /* Scatter gather list entries may cross 64KB boundaries */
2540                 running_total = TRB_MAX_BUFF_SIZE -
2541                         (sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1));
2542                 running_total &= TRB_MAX_BUFF_SIZE - 1;
2543                 if (running_total != 0)
2544                         num_trbs++;
2545
2546                 /* How many more 64KB chunks to transfer, how many more TRBs? */
2547                 while (running_total < sg_dma_len(sg) && running_total < temp) {
2548                         num_trbs++;
2549                         running_total += TRB_MAX_BUFF_SIZE;
2550                 }
2551                 xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n",
2552                                 i, (unsigned long long)sg_dma_address(sg),
2553                                 len, len, num_trbs - previous_total_trbs);
2554
2555                 len = min_t(int, len, temp);
2556                 temp -= len;
2557                 if (temp == 0)
2558                         break;
2559         }
2560         xhci_dbg(xhci, "\n");
2561         if (!in_interrupt())
2562                 xhci_dbg(xhci, "ep %#x - urb len = %d, sglist used, "
2563                                 "num_trbs = %d\n",
2564                                 urb->ep->desc.bEndpointAddress,
2565                                 urb->transfer_buffer_length,
2566                                 num_trbs);
2567         return num_trbs;
2568 }
2569
2570 static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
2571 {
2572         if (num_trbs != 0)
2573                 dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated number of "
2574                                 "TRBs, %d left\n", __func__,
2575                                 urb->ep->desc.bEndpointAddress, num_trbs);
2576         if (running_total != urb->transfer_buffer_length)
2577                 dev_err(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, "
2578                                 "queued %#x (%d), asked for %#x (%d)\n",
2579                                 __func__,
2580                                 urb->ep->desc.bEndpointAddress,
2581                                 running_total, running_total,
2582                                 urb->transfer_buffer_length,
2583                                 urb->transfer_buffer_length);
2584 }
2585
2586 static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id,
2587                 unsigned int ep_index, unsigned int stream_id, int start_cycle,
2588                 struct xhci_generic_trb *start_trb)
2589 {
2590         /*
2591          * Pass all the TRBs to the hardware at once and make sure this write
2592          * isn't reordered.
2593          */
2594         wmb();
2595         if (start_cycle)
2596                 start_trb->field[3] |= cpu_to_le32(start_cycle);
2597         else
2598                 start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE);
2599         xhci_ring_ep_doorbell(xhci, slot_id, ep_index, stream_id);
2600 }
2601
2602 /*
2603  * xHCI uses normal TRBs for both bulk and interrupt.  When the interrupt
2604  * endpoint is to be serviced, the xHC will consume (at most) one TD.  A TD
2605  * (comprised of sg list entries) can take several service intervals to
2606  * transmit.
2607  */
2608 int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
2609                 struct urb *urb, int slot_id, unsigned int ep_index)
2610 {
2611         struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci,
2612                         xhci->devs[slot_id]->out_ctx, ep_index);
2613         int xhci_interval;
2614         int ep_interval;
2615
2616         xhci_interval = EP_INTERVAL_TO_UFRAMES(le32_to_cpu(ep_ctx->ep_info));
2617         ep_interval = urb->interval;
2618         /* Convert to microframes */
2619         if (urb->dev->speed == USB_SPEED_LOW ||
2620                         urb->dev->speed == USB_SPEED_FULL)
2621                 ep_interval *= 8;
2622         /* FIXME change this to a warning and a suggestion to use the new API
2623          * to set the polling interval (once the API is added).
2624          */
2625         if (xhci_interval != ep_interval) {
2626                 if (printk_ratelimit())
2627                         dev_dbg(&urb->dev->dev, "Driver uses different interval"
2628                                         " (%d microframe%s) than xHCI "
2629                                         "(%d microframe%s)\n",
2630                                         ep_interval,
2631                                         ep_interval == 1 ? "" : "s",
2632                                         xhci_interval,
2633                                         xhci_interval == 1 ? "" : "s");
2634                 urb->interval = xhci_interval;
2635                 /* Convert back to frames for LS/FS devices */
2636                 if (urb->dev->speed == USB_SPEED_LOW ||
2637                                 urb->dev->speed == USB_SPEED_FULL)
2638                         urb->interval /= 8;
2639         }
2640         return xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb, slot_id, ep_index);
2641 }
2642
2643 /*
2644  * The TD size is the number of bytes remaining in the TD (including this TRB),
2645  * right shifted by 10.
2646  * It must fit in bits 21:17, so it can't be bigger than 31.
2647  */
2648 static u32 xhci_td_remainder(unsigned int remainder)
2649 {
2650         u32 max = (1 << (21 - 17 + 1)) - 1;
2651
2652         if ((remainder >> 10) >= max)
2653                 return max << 17;
2654         else
2655                 return (remainder >> 10) << 17;
2656 }
2657
2658 /*
2659  * For xHCI 1.0 host controllers, TD size is the number of packets remaining in
2660  * the TD (*not* including this TRB).
2661  *
2662  * Total TD packet count = total_packet_count =
2663  *     roundup(TD size in bytes / wMaxPacketSize)
2664  *
2665  * Packets transferred up to and including this TRB = packets_transferred =
2666  *     rounddown(total bytes transferred including this TRB / wMaxPacketSize)
2667  *
2668  * TD size = total_packet_count - packets_transferred
2669  *
2670  * It must fit in bits 21:17, so it can't be bigger than 31.
2671  */
2672
2673 static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len,
2674                 unsigned int total_packet_count, struct urb *urb)
2675 {
2676         int packets_transferred;
2677
2678         /* All the TRB queueing functions don't count the current TRB in
2679          * running_total.
2680          */
2681         packets_transferred = (running_total + trb_buff_len) /
2682                 le16_to_cpu(urb->ep->desc.wMaxPacketSize);
2683
2684         return xhci_td_remainder(total_packet_count - packets_transferred);
2685 }
2686
2687 static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
2688                 struct urb *urb, int slot_id, unsigned int ep_index)
2689 {
2690         struct xhci_ring *ep_ring;
2691         unsigned int num_trbs;
2692         struct urb_priv *urb_priv;
2693         struct xhci_td *td;
2694         struct scatterlist *sg;
2695         int num_sgs;
2696         int trb_buff_len, this_sg_len, running_total;
2697         unsigned int total_packet_count;
2698         bool first_trb;
2699         u64 addr;
2700         bool more_trbs_coming;
2701
2702         struct xhci_generic_trb *start_trb;
2703         int start_cycle;
2704
2705         ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
2706         if (!ep_ring)
2707                 return -EINVAL;
2708
2709         num_trbs = count_sg_trbs_needed(xhci, urb);
2710         num_sgs = urb->num_sgs;
2711         total_packet_count = roundup(urb->transfer_buffer_length,
2712                         le16_to_cpu(urb->ep->desc.wMaxPacketSize));
2713
2714         trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
2715                         ep_index, urb->stream_id,
2716                         num_trbs, urb, 0, mem_flags);
2717         if (trb_buff_len < 0)
2718                 return trb_buff_len;
2719
2720         urb_priv = urb->hcpriv;
2721         td = urb_priv->td[0];
2722
2723         /*
2724          * Don't give the first TRB to the hardware (by toggling the cycle bit)
2725          * until we've finished creating all the other TRBs.  The ring's cycle
2726          * state may change as we enqueue the other TRBs, so save it too.
2727          */
2728         start_trb = &ep_ring->enqueue->generic;
2729         start_cycle = ep_ring->cycle_state;
2730
2731         running_total = 0;
2732         /*
2733          * How much data is in the first TRB?
2734          *
2735          * There are three forces at work for TRB buffer pointers and lengths:
2736          * 1. We don't want to walk off the end of this sg-list entry buffer.
2737          * 2. The transfer length that the driver requested may be smaller than
2738          *    the amount of memory allocated for this scatter-gather list.
2739          * 3. TRBs buffers can't cross 64KB boundaries.
2740          */
2741         sg = urb->sg;
2742         addr = (u64) sg_dma_address(sg);
2743         this_sg_len = sg_dma_len(sg);
2744         trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & (TRB_MAX_BUFF_SIZE - 1));
2745         trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
2746         if (trb_buff_len > urb->transfer_buffer_length)
2747                 trb_buff_len = urb->transfer_buffer_length;
2748         xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n",
2749                         trb_buff_len);
2750
2751         first_trb = true;
2752         /* Queue the first TRB, even if it's zero-length */
2753         do {
2754                 u32 field = 0;
2755                 u32 length_field = 0;
2756                 u32 remainder = 0;
2757
2758                 /* Don't change the cycle bit of the first TRB until later */
2759                 if (first_trb) {
2760                         first_trb = false;
2761                         if (start_cycle == 0)
2762                                 field |= 0x1;
2763                 } else
2764                         field |= ep_ring->cycle_state;
2765
2766                 /* Chain all the TRBs together; clear the chain bit in the last
2767                  * TRB to indicate it's the last TRB in the chain.
2768                  */
2769                 if (num_trbs > 1) {
2770                         field |= TRB_CHAIN;
2771                 } else {
2772                         /* FIXME - add check for ZERO_PACKET flag before this */
2773                         td->last_trb = ep_ring->enqueue;
2774                         field |= TRB_IOC;
2775                 }
2776
2777                 /* Only set interrupt on short packet for IN endpoints */
2778                 if (usb_urb_dir_in(urb))
2779                         field |= TRB_ISP;
2780
2781                 xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), "
2782                                 "64KB boundary at %#x, end dma = %#x\n",
2783                                 (unsigned int) addr, trb_buff_len, trb_buff_len,
2784                                 (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
2785                                 (unsigned int) addr + trb_buff_len);
2786                 if (TRB_MAX_BUFF_SIZE -
2787                                 (addr & (TRB_MAX_BUFF_SIZE - 1)) < trb_buff_len) {
2788                         xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n");
2789                         xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n",
2790                                         (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
2791                                         (unsigned int) addr + trb_buff_len);
2792                 }
2793
2794                 /* Set the TRB length, TD size, and interrupter fields. */
2795                 if (xhci->hci_version < 0x100) {
2796                         remainder = xhci_td_remainder(
2797                                         urb->transfer_buffer_length -
2798                                         running_total);
2799                 } else {
2800                         remainder = xhci_v1_0_td_remainder(running_total,
2801                                         trb_buff_len, total_packet_count, urb);
2802                 }
2803                 length_field = TRB_LEN(trb_buff_len) |
2804                         remainder |
2805                         TRB_INTR_TARGET(0);
2806
2807                 if (num_trbs > 1)
2808                         more_trbs_coming = true;
2809                 else
2810                         more_trbs_coming = false;
2811                 queue_trb(xhci, ep_ring, false, more_trbs_coming,
2812                                 lower_32_bits(addr),
2813                                 upper_32_bits(addr),
2814                                 length_field,
2815                                 field | TRB_TYPE(TRB_NORMAL));
2816                 --num_trbs;
2817                 running_total += trb_buff_len;
2818
2819                 /* Calculate length for next transfer --
2820                  * Are we done queueing all the TRBs for this sg entry?
2821                  */
2822                 this_sg_len -= trb_buff_len;
2823                 if (this_sg_len == 0) {
2824                         --num_sgs;
2825                         if (num_sgs == 0)
2826                                 break;
2827                         sg = sg_next(sg);
2828                         addr = (u64) sg_dma_address(sg);
2829                         this_sg_len = sg_dma_len(sg);
2830                 } else {
2831                         addr += trb_buff_len;
2832                 }
2833
2834                 trb_buff_len = TRB_MAX_BUFF_SIZE -
2835                         (addr & (TRB_MAX_BUFF_SIZE - 1));
2836                 trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
2837                 if (running_total + trb_buff_len > urb->transfer_buffer_length)
2838                         trb_buff_len =
2839                                 urb->transfer_buffer_length - running_total;
2840         } while (running_total < urb->transfer_buffer_length);
2841
2842         check_trb_math(urb, num_trbs, running_total);
2843         giveback_first_trb(xhci, slot_id, ep_index, urb->stream_id,
2844         &nb