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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xHCI host controller driver
4 *
5 * Copyright (C) 2008 Intel Corp.
6 *
7 * Author: Sarah Sharp
8 * Some code borrowed from the Linux EHCI driver.
9 */
10
11#include <linux/usb.h>
12#include <linux/overflow.h>
13#include <linux/pci.h>
14#include <linux/slab.h>
15#include <linux/dmapool.h>
16#include <linux/dma-mapping.h>
17
18#include "xhci.h"
19#include "xhci-trace.h"
20#include "xhci-debugfs.h"
21
22/*
23 * Allocates a generic ring segment from the ring pool, sets the dma address,
24 * initializes the segment to zero, and sets the private next pointer to NULL.
25 *
26 * Section 4.11.1.1:
27 * "All components of all Command and Transfer TRBs shall be initialized to '0'"
28 */
29static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci,
30 unsigned int cycle_state,
31 unsigned int max_packet,
32 unsigned int num,
33 gfp_t flags)
34{
35 struct xhci_segment *seg;
36 dma_addr_t dma;
37 int i;
38 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
39
40 seg = kzalloc_node(sizeof(*seg), flags, dev_to_node(dev));
41 if (!seg)
42 return NULL;
43
44 seg->trbs = dma_pool_zalloc(xhci->segment_pool, flags, &dma);
45 if (!seg->trbs) {
46 kfree(seg);
47 return NULL;
48 }
49
50 if (max_packet) {
51 seg->bounce_buf = kzalloc_node(max_packet, flags,
52 dev_to_node(dev));
53 if (!seg->bounce_buf) {
54 dma_pool_free(xhci->segment_pool, seg->trbs, dma);
55 kfree(seg);
56 return NULL;
57 }
58 }
59 /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */
60 if (cycle_state == 0) {
61 for (i = 0; i < TRBS_PER_SEGMENT; i++)
62 seg->trbs[i].link.control = cpu_to_le32(TRB_CYCLE);
63 }
64 seg->num = num;
65 seg->dma = dma;
66 seg->next = NULL;
67
68 return seg;
69}
70
71static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
72{
73 if (seg->trbs) {
74 dma_pool_free(xhci->segment_pool, seg->trbs, seg->dma);
75 seg->trbs = NULL;
76 }
77 kfree(seg->bounce_buf);
78 kfree(seg);
79}
80
81static void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
82 struct xhci_segment *first)
83{
84 struct xhci_segment *seg;
85
86 seg = first->next;
87 while (seg != first) {
88 struct xhci_segment *next = seg->next;
89 xhci_segment_free(xhci, seg);
90 seg = next;
91 }
92 xhci_segment_free(xhci, first);
93}
94
95/*
96 * Make the prev segment point to the next segment.
97 *
98 * Change the last TRB in the prev segment to be a Link TRB which points to the
99 * DMA address of the next segment. The caller needs to set any Link TRB
100 * related flags, such as End TRB, Toggle Cycle, and no snoop.
101 */
102static void xhci_link_segments(struct xhci_segment *prev,
103 struct xhci_segment *next,
104 enum xhci_ring_type type, bool chain_links)
105{
106 u32 val;
107
108 if (!prev || !next)
109 return;
110 prev->next = next;
111 if (type != TYPE_EVENT) {
112 prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr =
113 cpu_to_le64(next->dma);
114
115 /* Set the last TRB in the segment to have a TRB type ID of Link TRB */
116 val = le32_to_cpu(prev->trbs[TRBS_PER_SEGMENT-1].link.control);
117 val &= ~TRB_TYPE_BITMASK;
118 val |= TRB_TYPE(TRB_LINK);
119 if (chain_links)
120 val |= TRB_CHAIN;
121 prev->trbs[TRBS_PER_SEGMENT-1].link.control = cpu_to_le32(val);
122 }
123}
124
125/*
126 * Link the ring to the new segments.
127 * Set Toggle Cycle for the new ring if needed.
128 */
129static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring,
130 struct xhci_segment *first, struct xhci_segment *last,
131 unsigned int num_segs)
132{
133 struct xhci_segment *next, *seg;
134 bool chain_links;
135
136 if (!ring || !first || !last)
137 return;
138
139 /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */
140 chain_links = !!(xhci_link_trb_quirk(xhci) ||
141 (ring->type == TYPE_ISOC &&
142 (xhci->quirks & XHCI_AMD_0x96_HOST)));
143
144 next = ring->enq_seg->next;
145 xhci_link_segments(ring->enq_seg, first, ring->type, chain_links);
146 xhci_link_segments(last, next, ring->type, chain_links);
147 ring->num_segs += num_segs;
148
149 if (ring->enq_seg == ring->last_seg) {
150 if (ring->type != TYPE_EVENT) {
151 ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control
152 &= ~cpu_to_le32(LINK_TOGGLE);
153 last->trbs[TRBS_PER_SEGMENT-1].link.control
154 |= cpu_to_le32(LINK_TOGGLE);
155 }
156 ring->last_seg = last;
157 }
158
159 for (seg = last; seg != ring->last_seg; seg = seg->next)
160 seg->next->num = seg->num + 1;
161}
162
163/*
164 * We need a radix tree for mapping physical addresses of TRBs to which stream
165 * ID they belong to. We need to do this because the host controller won't tell
166 * us which stream ring the TRB came from. We could store the stream ID in an
167 * event data TRB, but that doesn't help us for the cancellation case, since the
168 * endpoint may stop before it reaches that event data TRB.
169 *
170 * The radix tree maps the upper portion of the TRB DMA address to a ring
171 * segment that has the same upper portion of DMA addresses. For example, say I
172 * have segments of size 1KB, that are always 1KB aligned. A segment may
173 * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the
174 * key to the stream ID is 0x43244. I can use the DMA address of the TRB to
175 * pass the radix tree a key to get the right stream ID:
176 *
177 * 0x10c90fff >> 10 = 0x43243
178 * 0x10c912c0 >> 10 = 0x43244
179 * 0x10c91400 >> 10 = 0x43245
180 *
181 * Obviously, only those TRBs with DMA addresses that are within the segment
182 * will make the radix tree return the stream ID for that ring.
183 *
184 * Caveats for the radix tree:
185 *
186 * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an
187 * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be
188 * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the
189 * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit
190 * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit
191 * extended systems (where the DMA address can be bigger than 32-bits),
192 * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
193 */
194static int xhci_insert_segment_mapping(struct radix_tree_root *trb_address_map,
195 struct xhci_ring *ring,
196 struct xhci_segment *seg,
197 gfp_t mem_flags)
198{
199 unsigned long key;
200 int ret;
201
202 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
203 /* Skip any segments that were already added. */
204 if (radix_tree_lookup(trb_address_map, key))
205 return 0;
206
207 ret = radix_tree_maybe_preload(mem_flags);
208 if (ret)
209 return ret;
210 ret = radix_tree_insert(trb_address_map,
211 key, ring);
212 radix_tree_preload_end();
213 return ret;
214}
215
216static void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map,
217 struct xhci_segment *seg)
218{
219 unsigned long key;
220
221 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
222 if (radix_tree_lookup(trb_address_map, key))
223 radix_tree_delete(trb_address_map, key);
224}
225
226static int xhci_update_stream_segment_mapping(
227 struct radix_tree_root *trb_address_map,
228 struct xhci_ring *ring,
229 struct xhci_segment *first_seg,
230 struct xhci_segment *last_seg,
231 gfp_t mem_flags)
232{
233 struct xhci_segment *seg;
234 struct xhci_segment *failed_seg;
235 int ret;
236
237 if (WARN_ON_ONCE(trb_address_map == NULL))
238 return 0;
239
240 seg = first_seg;
241 do {
242 ret = xhci_insert_segment_mapping(trb_address_map,
243 ring, seg, mem_flags);
244 if (ret)
245 goto remove_streams;
246 if (seg == last_seg)
247 return 0;
248 seg = seg->next;
249 } while (seg != first_seg);
250
251 return 0;
252
253remove_streams:
254 failed_seg = seg;
255 seg = first_seg;
256 do {
257 xhci_remove_segment_mapping(trb_address_map, seg);
258 if (seg == failed_seg)
259 return ret;
260 seg = seg->next;
261 } while (seg != first_seg);
262
263 return ret;
264}
265
266static void xhci_remove_stream_mapping(struct xhci_ring *ring)
267{
268 struct xhci_segment *seg;
269
270 if (WARN_ON_ONCE(ring->trb_address_map == NULL))
271 return;
272
273 seg = ring->first_seg;
274 do {
275 xhci_remove_segment_mapping(ring->trb_address_map, seg);
276 seg = seg->next;
277 } while (seg != ring->first_seg);
278}
279
280static int xhci_update_stream_mapping(struct xhci_ring *ring, gfp_t mem_flags)
281{
282 return xhci_update_stream_segment_mapping(ring->trb_address_map, ring,
283 ring->first_seg, ring->last_seg, mem_flags);
284}
285
286/* XXX: Do we need the hcd structure in all these functions? */
287void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
288{
289 if (!ring)
290 return;
291
292 trace_xhci_ring_free(ring);
293
294 if (ring->first_seg) {
295 if (ring->type == TYPE_STREAM)
296 xhci_remove_stream_mapping(ring);
297 xhci_free_segments_for_ring(xhci, ring->first_seg);
298 }
299
300 kfree(ring);
301}
302
303void xhci_initialize_ring_info(struct xhci_ring *ring,
304 unsigned int cycle_state)
305{
306 /* The ring is empty, so the enqueue pointer == dequeue pointer */
307 ring->enqueue = ring->first_seg->trbs;
308 ring->enq_seg = ring->first_seg;
309 ring->dequeue = ring->enqueue;
310 ring->deq_seg = ring->first_seg;
311 /* The ring is initialized to 0. The producer must write 1 to the cycle
312 * bit to handover ownership of the TRB, so PCS = 1. The consumer must
313 * compare CCS to the cycle bit to check ownership, so CCS = 1.
314 *
315 * New rings are initialized with cycle state equal to 1; if we are
316 * handling ring expansion, set the cycle state equal to the old ring.
317 */
318 ring->cycle_state = cycle_state;
319
320 /*
321 * Each segment has a link TRB, and leave an extra TRB for SW
322 * accounting purpose
323 */
324 ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
325}
326EXPORT_SYMBOL_GPL(xhci_initialize_ring_info);
327
328/* Allocate segments and link them for a ring */
329static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,
330 struct xhci_segment **first, struct xhci_segment **last,
331 unsigned int num_segs, unsigned int num,
332 unsigned int cycle_state, enum xhci_ring_type type,
333 unsigned int max_packet, gfp_t flags)
334{
335 struct xhci_segment *prev;
336 bool chain_links;
337
338 /* Set chain bit for 0.95 hosts, and for isoc rings on AMD 0.96 host */
339 chain_links = !!(xhci_link_trb_quirk(xhci) ||
340 (type == TYPE_ISOC &&
341 (xhci->quirks & XHCI_AMD_0x96_HOST)));
342
343 prev = xhci_segment_alloc(xhci, cycle_state, max_packet, num, flags);
344 if (!prev)
345 return -ENOMEM;
346 num++;
347
348 *first = prev;
349 while (num < num_segs) {
350 struct xhci_segment *next;
351
352 next = xhci_segment_alloc(xhci, cycle_state, max_packet, num,
353 flags);
354 if (!next) {
355 prev = *first;
356 while (prev) {
357 next = prev->next;
358 xhci_segment_free(xhci, prev);
359 prev = next;
360 }
361 return -ENOMEM;
362 }
363 xhci_link_segments(prev, next, type, chain_links);
364
365 prev = next;
366 num++;
367 }
368 xhci_link_segments(prev, *first, type, chain_links);
369 *last = prev;
370
371 return 0;
372}
373
374/*
375 * Create a new ring with zero or more segments.
376 *
377 * Link each segment together into a ring.
378 * Set the end flag and the cycle toggle bit on the last segment.
379 * See section 4.9.1 and figures 15 and 16.
380 */
381struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
382 unsigned int num_segs, unsigned int cycle_state,
383 enum xhci_ring_type type, unsigned int max_packet, gfp_t flags)
384{
385 struct xhci_ring *ring;
386 int ret;
387 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
388
389 ring = kzalloc_node(sizeof(*ring), flags, dev_to_node(dev));
390 if (!ring)
391 return NULL;
392
393 ring->num_segs = num_segs;
394 ring->bounce_buf_len = max_packet;
395 INIT_LIST_HEAD(&ring->td_list);
396 ring->type = type;
397 if (num_segs == 0)
398 return ring;
399
400 ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg,
401 &ring->last_seg, num_segs, 0, cycle_state, type,
402 max_packet, flags);
403 if (ret)
404 goto fail;
405
406 /* Only event ring does not use link TRB */
407 if (type != TYPE_EVENT) {
408 /* See section 4.9.2.1 and 6.4.4.1 */
409 ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
410 cpu_to_le32(LINK_TOGGLE);
411 }
412 xhci_initialize_ring_info(ring, cycle_state);
413 trace_xhci_ring_alloc(ring);
414 return ring;
415
416fail:
417 kfree(ring);
418 return NULL;
419}
420
421void xhci_free_endpoint_ring(struct xhci_hcd *xhci,
422 struct xhci_virt_device *virt_dev,
423 unsigned int ep_index)
424{
425 xhci_ring_free(xhci, virt_dev->eps[ep_index].ring);
426 virt_dev->eps[ep_index].ring = NULL;
427}
428
429/*
430 * Expand an existing ring.
431 * Allocate a new ring which has same segment numbers and link the two rings.
432 */
433int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
434 unsigned int num_new_segs, gfp_t flags)
435{
436 struct xhci_segment *first;
437 struct xhci_segment *last;
438 int ret;
439
440 ret = xhci_alloc_segments_for_ring(xhci, &first, &last,
441 num_new_segs, ring->enq_seg->num + 1,
442 ring->cycle_state, ring->type,
443 ring->bounce_buf_len, flags);
444 if (ret)
445 return -ENOMEM;
446
447 if (ring->type == TYPE_STREAM)
448 ret = xhci_update_stream_segment_mapping(ring->trb_address_map,
449 ring, first, last, flags);
450 if (ret) {
451 struct xhci_segment *next;
452 do {
453 next = first->next;
454 xhci_segment_free(xhci, first);
455 if (first == last)
456 break;
457 first = next;
458 } while (true);
459 return ret;
460 }
461
462 xhci_link_rings(xhci, ring, first, last, num_new_segs);
463 trace_xhci_ring_expansion(ring);
464 xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion,
465 "ring expansion succeed, now has %d segments",
466 ring->num_segs);
467
468 return 0;
469}
470
471struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci,
472 int type, gfp_t flags)
473{
474 struct xhci_container_ctx *ctx;
475 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
476
477 if ((type != XHCI_CTX_TYPE_DEVICE) && (type != XHCI_CTX_TYPE_INPUT))
478 return NULL;
479
480 ctx = kzalloc_node(sizeof(*ctx), flags, dev_to_node(dev));
481 if (!ctx)
482 return NULL;
483
484 ctx->type = type;
485 ctx->size = HCC_64BYTE_CONTEXT(xhci->hcc_params) ? 2048 : 1024;
486 if (type == XHCI_CTX_TYPE_INPUT)
487 ctx->size += CTX_SIZE(xhci->hcc_params);
488
489 ctx->bytes = dma_pool_zalloc(xhci->device_pool, flags, &ctx->dma);
490 if (!ctx->bytes) {
491 kfree(ctx);
492 return NULL;
493 }
494 return ctx;
495}
496
497void xhci_free_container_ctx(struct xhci_hcd *xhci,
498 struct xhci_container_ctx *ctx)
499{
500 if (!ctx)
501 return;
502 dma_pool_free(xhci->device_pool, ctx->bytes, ctx->dma);
503 kfree(ctx);
504}
505
506struct xhci_input_control_ctx *xhci_get_input_control_ctx(
507 struct xhci_container_ctx *ctx)
508{
509 if (ctx->type != XHCI_CTX_TYPE_INPUT)
510 return NULL;
511
512 return (struct xhci_input_control_ctx *)ctx->bytes;
513}
514
515struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci,
516 struct xhci_container_ctx *ctx)
517{
518 if (ctx->type == XHCI_CTX_TYPE_DEVICE)
519 return (struct xhci_slot_ctx *)ctx->bytes;
520
521 return (struct xhci_slot_ctx *)
522 (ctx->bytes + CTX_SIZE(xhci->hcc_params));
523}
524
525struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci,
526 struct xhci_container_ctx *ctx,
527 unsigned int ep_index)
528{
529 /* increment ep index by offset of start of ep ctx array */
530 ep_index++;
531 if (ctx->type == XHCI_CTX_TYPE_INPUT)
532 ep_index++;
533
534 return (struct xhci_ep_ctx *)
535 (ctx->bytes + (ep_index * CTX_SIZE(xhci->hcc_params)));
536}
537EXPORT_SYMBOL_GPL(xhci_get_ep_ctx);
538
539/***************** Streams structures manipulation *************************/
540
541static void xhci_free_stream_ctx(struct xhci_hcd *xhci,
542 unsigned int num_stream_ctxs,
543 struct xhci_stream_ctx *stream_ctx, dma_addr_t dma)
544{
545 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
546 size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
547
548 if (size > MEDIUM_STREAM_ARRAY_SIZE)
549 dma_free_coherent(dev, size, stream_ctx, dma);
550 else if (size > SMALL_STREAM_ARRAY_SIZE)
551 dma_pool_free(xhci->medium_streams_pool, stream_ctx, dma);
552 else
553 dma_pool_free(xhci->small_streams_pool, stream_ctx, dma);
554}
555
556/*
557 * The stream context array for each endpoint with bulk streams enabled can
558 * vary in size, based on:
559 * - how many streams the endpoint supports,
560 * - the maximum primary stream array size the host controller supports,
561 * - and how many streams the device driver asks for.
562 *
563 * The stream context array must be a power of 2, and can be as small as
564 * 64 bytes or as large as 1MB.
565 */
566static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
567 unsigned int num_stream_ctxs, dma_addr_t *dma,
568 gfp_t mem_flags)
569{
570 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
571 size_t size = size_mul(sizeof(struct xhci_stream_ctx), num_stream_ctxs);
572
573 if (size > MEDIUM_STREAM_ARRAY_SIZE)
574 return dma_alloc_coherent(dev, size, dma, mem_flags);
575 if (size > SMALL_STREAM_ARRAY_SIZE)
576 return dma_pool_zalloc(xhci->medium_streams_pool, mem_flags, dma);
577 else
578 return dma_pool_zalloc(xhci->small_streams_pool, mem_flags, dma);
579}
580
581struct xhci_ring *xhci_dma_to_transfer_ring(
582 struct xhci_virt_ep *ep,
583 u64 address)
584{
585 if (ep->ep_state & EP_HAS_STREAMS)
586 return radix_tree_lookup(&ep->stream_info->trb_address_map,
587 address >> TRB_SEGMENT_SHIFT);
588 return ep->ring;
589}
590
591/*
592 * Change an endpoint's internal structure so it supports stream IDs. The
593 * number of requested streams includes stream 0, which cannot be used by device
594 * drivers.
595 *
596 * The number of stream contexts in the stream context array may be bigger than
597 * the number of streams the driver wants to use. This is because the number of
598 * stream context array entries must be a power of two.
599 */
600struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
601 unsigned int num_stream_ctxs,
602 unsigned int num_streams,
603 unsigned int max_packet, gfp_t mem_flags)
604{
605 struct xhci_stream_info *stream_info;
606 u32 cur_stream;
607 struct xhci_ring *cur_ring;
608 u64 addr;
609 int ret;
610 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
611
612 xhci_dbg(xhci, "Allocating %u streams and %u stream context array entries.\n",
613 num_streams, num_stream_ctxs);
614 if (xhci->cmd_ring_reserved_trbs == MAX_RSVD_CMD_TRBS) {
615 xhci_dbg(xhci, "Command ring has no reserved TRBs available\n");
616 return NULL;
617 }
618 xhci->cmd_ring_reserved_trbs++;
619
620 stream_info = kzalloc_node(sizeof(*stream_info), mem_flags,
621 dev_to_node(dev));
622 if (!stream_info)
623 goto cleanup_trbs;
624
625 stream_info->num_streams = num_streams;
626 stream_info->num_stream_ctxs = num_stream_ctxs;
627
628 /* Initialize the array of virtual pointers to stream rings. */
629 stream_info->stream_rings = kcalloc_node(
630 num_streams, sizeof(struct xhci_ring *), mem_flags,
631 dev_to_node(dev));
632 if (!stream_info->stream_rings)
633 goto cleanup_info;
634
635 /* Initialize the array of DMA addresses for stream rings for the HW. */
636 stream_info->stream_ctx_array = xhci_alloc_stream_ctx(xhci,
637 num_stream_ctxs, &stream_info->ctx_array_dma,
638 mem_flags);
639 if (!stream_info->stream_ctx_array)
640 goto cleanup_ring_array;
641
642 /* Allocate everything needed to free the stream rings later */
643 stream_info->free_streams_command =
644 xhci_alloc_command_with_ctx(xhci, true, mem_flags);
645 if (!stream_info->free_streams_command)
646 goto cleanup_ctx;
647
648 INIT_RADIX_TREE(&stream_info->trb_address_map, GFP_ATOMIC);
649
650 /* Allocate rings for all the streams that the driver will use,
651 * and add their segment DMA addresses to the radix tree.
652 * Stream 0 is reserved.
653 */
654
655 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
656 stream_info->stream_rings[cur_stream] =
657 xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, max_packet,
658 mem_flags);
659 cur_ring = stream_info->stream_rings[cur_stream];
660 if (!cur_ring)
661 goto cleanup_rings;
662 cur_ring->stream_id = cur_stream;
663 cur_ring->trb_address_map = &stream_info->trb_address_map;
664 /* Set deq ptr, cycle bit, and stream context type */
665 addr = cur_ring->first_seg->dma |
666 SCT_FOR_CTX(SCT_PRI_TR) |
667 cur_ring->cycle_state;
668 stream_info->stream_ctx_array[cur_stream].stream_ring =
669 cpu_to_le64(addr);
670 xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n", cur_stream, addr);
671
672 ret = xhci_update_stream_mapping(cur_ring, mem_flags);
673 if (ret) {
674 xhci_ring_free(xhci, cur_ring);
675 stream_info->stream_rings[cur_stream] = NULL;
676 goto cleanup_rings;
677 }
678 }
679 /* Leave the other unused stream ring pointers in the stream context
680 * array initialized to zero. This will cause the xHC to give us an
681 * error if the device asks for a stream ID we don't have setup (if it
682 * was any other way, the host controller would assume the ring is
683 * "empty" and wait forever for data to be queued to that stream ID).
684 */
685
686 return stream_info;
687
688cleanup_rings:
689 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
690 cur_ring = stream_info->stream_rings[cur_stream];
691 if (cur_ring) {
692 xhci_ring_free(xhci, cur_ring);
693 stream_info->stream_rings[cur_stream] = NULL;
694 }
695 }
696 xhci_free_command(xhci, stream_info->free_streams_command);
697cleanup_ctx:
698 xhci_free_stream_ctx(xhci,
699 stream_info->num_stream_ctxs,
700 stream_info->stream_ctx_array,
701 stream_info->ctx_array_dma);
702cleanup_ring_array:
703 kfree(stream_info->stream_rings);
704cleanup_info:
705 kfree(stream_info);
706cleanup_trbs:
707 xhci->cmd_ring_reserved_trbs--;
708 return NULL;
709}
710/*
711 * Sets the MaxPStreams field and the Linear Stream Array field.
712 * Sets the dequeue pointer to the stream context array.
713 */
714void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
715 struct xhci_ep_ctx *ep_ctx,
716 struct xhci_stream_info *stream_info)
717{
718 u32 max_primary_streams;
719 /* MaxPStreams is the number of stream context array entries, not the
720 * number we're actually using. Must be in 2^(MaxPstreams + 1) format.
721 * fls(0) = 0, fls(0x1) = 1, fls(0x10) = 2, fls(0x100) = 3, etc.
722 */
723 max_primary_streams = fls(stream_info->num_stream_ctxs) - 2;
724 xhci_dbg_trace(xhci, trace_xhci_dbg_context_change,
725 "Setting number of stream ctx array entries to %u",
726 1 << (max_primary_streams + 1));
727 ep_ctx->ep_info &= cpu_to_le32(~EP_MAXPSTREAMS_MASK);
728 ep_ctx->ep_info |= cpu_to_le32(EP_MAXPSTREAMS(max_primary_streams)
729 | EP_HAS_LSA);
730 ep_ctx->deq = cpu_to_le64(stream_info->ctx_array_dma);
731}
732
733/*
734 * Sets the MaxPStreams field and the Linear Stream Array field to 0.
735 * Reinstalls the "normal" endpoint ring (at its previous dequeue mark,
736 * not at the beginning of the ring).
737 */
738void xhci_setup_no_streams_ep_input_ctx(struct xhci_ep_ctx *ep_ctx,
739 struct xhci_virt_ep *ep)
740{
741 dma_addr_t addr;
742 ep_ctx->ep_info &= cpu_to_le32(~(EP_MAXPSTREAMS_MASK | EP_HAS_LSA));
743 addr = xhci_trb_virt_to_dma(ep->ring->deq_seg, ep->ring->dequeue);
744 ep_ctx->deq = cpu_to_le64(addr | ep->ring->cycle_state);
745}
746
747/* Frees all stream contexts associated with the endpoint,
748 *
749 * Caller should fix the endpoint context streams fields.
750 */
751void xhci_free_stream_info(struct xhci_hcd *xhci,
752 struct xhci_stream_info *stream_info)
753{
754 int cur_stream;
755 struct xhci_ring *cur_ring;
756
757 if (!stream_info)
758 return;
759
760 for (cur_stream = 1; cur_stream < stream_info->num_streams;
761 cur_stream++) {
762 cur_ring = stream_info->stream_rings[cur_stream];
763 if (cur_ring) {
764 xhci_ring_free(xhci, cur_ring);
765 stream_info->stream_rings[cur_stream] = NULL;
766 }
767 }
768 xhci_free_command(xhci, stream_info->free_streams_command);
769 xhci->cmd_ring_reserved_trbs--;
770 if (stream_info->stream_ctx_array)
771 xhci_free_stream_ctx(xhci,
772 stream_info->num_stream_ctxs,
773 stream_info->stream_ctx_array,
774 stream_info->ctx_array_dma);
775
776 kfree(stream_info->stream_rings);
777 kfree(stream_info);
778}
779
780
781/***************** Device context manipulation *************************/
782
783static void xhci_free_tt_info(struct xhci_hcd *xhci,
784 struct xhci_virt_device *virt_dev,
785 int slot_id)
786{
787 struct list_head *tt_list_head;
788 struct xhci_tt_bw_info *tt_info, *next;
789 bool slot_found = false;
790
791 /* If the device never made it past the Set Address stage,
792 * it may not have the real_port set correctly.
793 */
794 if (virt_dev->real_port == 0 ||
795 virt_dev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) {
796 xhci_dbg(xhci, "Bad real port.\n");
797 return;
798 }
799
800 tt_list_head = &(xhci->rh_bw[virt_dev->real_port - 1].tts);
801 list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) {
802 /* Multi-TT hubs will have more than one entry */
803 if (tt_info->slot_id == slot_id) {
804 slot_found = true;
805 list_del(&tt_info->tt_list);
806 kfree(tt_info);
807 } else if (slot_found) {
808 break;
809 }
810 }
811}
812
813int xhci_alloc_tt_info(struct xhci_hcd *xhci,
814 struct xhci_virt_device *virt_dev,
815 struct usb_device *hdev,
816 struct usb_tt *tt, gfp_t mem_flags)
817{
818 struct xhci_tt_bw_info *tt_info;
819 unsigned int num_ports;
820 int i, j;
821 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
822
823 if (!tt->multi)
824 num_ports = 1;
825 else
826 num_ports = hdev->maxchild;
827
828 for (i = 0; i < num_ports; i++, tt_info++) {
829 struct xhci_interval_bw_table *bw_table;
830
831 tt_info = kzalloc_node(sizeof(*tt_info), mem_flags,
832 dev_to_node(dev));
833 if (!tt_info)
834 goto free_tts;
835 INIT_LIST_HEAD(&tt_info->tt_list);
836 list_add(&tt_info->tt_list,
837 &xhci->rh_bw[virt_dev->real_port - 1].tts);
838 tt_info->slot_id = virt_dev->udev->slot_id;
839 if (tt->multi)
840 tt_info->ttport = i+1;
841 bw_table = &tt_info->bw_table;
842 for (j = 0; j < XHCI_MAX_INTERVAL; j++)
843 INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints);
844 }
845 return 0;
846
847free_tts:
848 xhci_free_tt_info(xhci, virt_dev, virt_dev->udev->slot_id);
849 return -ENOMEM;
850}
851
852
853/* All the xhci_tds in the ring's TD list should be freed at this point.
854 * Should be called with xhci->lock held if there is any chance the TT lists
855 * will be manipulated by the configure endpoint, allocate device, or update
856 * hub functions while this function is removing the TT entries from the list.
857 */
858void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
859{
860 struct xhci_virt_device *dev;
861 int i;
862 int old_active_eps = 0;
863
864 /* Slot ID 0 is reserved */
865 if (slot_id == 0 || !xhci->devs[slot_id])
866 return;
867
868 dev = xhci->devs[slot_id];
869
870 xhci->dcbaa->dev_context_ptrs[slot_id] = 0;
871 if (!dev)
872 return;
873
874 trace_xhci_free_virt_device(dev);
875
876 if (dev->tt_info)
877 old_active_eps = dev->tt_info->active_eps;
878
879 for (i = 0; i < 31; i++) {
880 if (dev->eps[i].ring)
881 xhci_ring_free(xhci, dev->eps[i].ring);
882 if (dev->eps[i].stream_info)
883 xhci_free_stream_info(xhci,
884 dev->eps[i].stream_info);
885 /*
886 * Endpoints are normally deleted from the bandwidth list when
887 * endpoints are dropped, before device is freed.
888 * If host is dying or being removed then endpoints aren't
889 * dropped cleanly, so delete the endpoint from list here.
890 * Only applicable for hosts with software bandwidth checking.
891 */
892
893 if (!list_empty(&dev->eps[i].bw_endpoint_list)) {
894 list_del_init(&dev->eps[i].bw_endpoint_list);
895 xhci_dbg(xhci, "Slot %u endpoint %u not removed from BW list!\n",
896 slot_id, i);
897 }
898 }
899 /* If this is a hub, free the TT(s) from the TT list */
900 xhci_free_tt_info(xhci, dev, slot_id);
901 /* If necessary, update the number of active TTs on this root port */
902 xhci_update_tt_active_eps(xhci, dev, old_active_eps);
903
904 if (dev->in_ctx)
905 xhci_free_container_ctx(xhci, dev->in_ctx);
906 if (dev->out_ctx)
907 xhci_free_container_ctx(xhci, dev->out_ctx);
908
909 if (dev->udev && dev->udev->slot_id)
910 dev->udev->slot_id = 0;
911 kfree(xhci->devs[slot_id]);
912 xhci->devs[slot_id] = NULL;
913}
914
915/*
916 * Free a virt_device structure.
917 * If the virt_device added a tt_info (a hub) and has children pointing to
918 * that tt_info, then free the child first. Recursive.
919 * We can't rely on udev at this point to find child-parent relationships.
920 */
921static void xhci_free_virt_devices_depth_first(struct xhci_hcd *xhci, int slot_id)
922{
923 struct xhci_virt_device *vdev;
924 struct list_head *tt_list_head;
925 struct xhci_tt_bw_info *tt_info, *next;
926 int i;
927
928 vdev = xhci->devs[slot_id];
929 if (!vdev)
930 return;
931
932 if (vdev->real_port == 0 ||
933 vdev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) {
934 xhci_dbg(xhci, "Bad vdev->real_port.\n");
935 goto out;
936 }
937
938 tt_list_head = &(xhci->rh_bw[vdev->real_port - 1].tts);
939 list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) {
940 /* is this a hub device that added a tt_info to the tts list */
941 if (tt_info->slot_id == slot_id) {
942 /* are any devices using this tt_info? */
943 for (i = 1; i < HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
944 vdev = xhci->devs[i];
945 if (vdev && (vdev->tt_info == tt_info))
946 xhci_free_virt_devices_depth_first(
947 xhci, i);
948 }
949 }
950 }
951out:
952 /* we are now at a leaf device */
953 xhci_debugfs_remove_slot(xhci, slot_id);
954 xhci_free_virt_device(xhci, slot_id);
955}
956
957int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
958 struct usb_device *udev, gfp_t flags)
959{
960 struct xhci_virt_device *dev;
961 int i;
962
963 /* Slot ID 0 is reserved */
964 if (slot_id == 0 || xhci->devs[slot_id]) {
965 xhci_warn(xhci, "Bad Slot ID %d\n", slot_id);
966 return 0;
967 }
968
969 dev = kzalloc(sizeof(*dev), flags);
970 if (!dev)
971 return 0;
972
973 dev->slot_id = slot_id;
974
975 /* Allocate the (output) device context that will be used in the HC. */
976 dev->out_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_DEVICE, flags);
977 if (!dev->out_ctx)
978 goto fail;
979
980 xhci_dbg(xhci, "Slot %d output ctx = 0x%pad (dma)\n", slot_id, &dev->out_ctx->dma);
981
982 /* Allocate the (input) device context for address device command */
983 dev->in_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT, flags);
984 if (!dev->in_ctx)
985 goto fail;
986
987 xhci_dbg(xhci, "Slot %d input ctx = 0x%pad (dma)\n", slot_id, &dev->in_ctx->dma);
988
989 /* Initialize the cancellation and bandwidth list for each ep */
990 for (i = 0; i < 31; i++) {
991 dev->eps[i].ep_index = i;
992 dev->eps[i].vdev = dev;
993 dev->eps[i].xhci = xhci;
994 INIT_LIST_HEAD(&dev->eps[i].cancelled_td_list);
995 INIT_LIST_HEAD(&dev->eps[i].bw_endpoint_list);
996 }
997
998 /* Allocate endpoint 0 ring */
999 dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, 0, flags);
1000 if (!dev->eps[0].ring)
1001 goto fail;
1002
1003 dev->udev = udev;
1004
1005 /* Point to output device context in dcbaa. */
1006 xhci->dcbaa->dev_context_ptrs[slot_id] = cpu_to_le64(dev->out_ctx->dma);
1007 xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n",
1008 slot_id,
1009 &xhci->dcbaa->dev_context_ptrs[slot_id],
1010 le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id]));
1011
1012 trace_xhci_alloc_virt_device(dev);
1013
1014 xhci->devs[slot_id] = dev;
1015
1016 return 1;
1017fail:
1018
1019 if (dev->in_ctx)
1020 xhci_free_container_ctx(xhci, dev->in_ctx);
1021 if (dev->out_ctx)
1022 xhci_free_container_ctx(xhci, dev->out_ctx);
1023 kfree(dev);
1024
1025 return 0;
1026}
1027
1028void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
1029 struct usb_device *udev)
1030{
1031 struct xhci_virt_device *virt_dev;
1032 struct xhci_ep_ctx *ep0_ctx;
1033 struct xhci_ring *ep_ring;
1034
1035 virt_dev = xhci->devs[udev->slot_id];
1036 ep0_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, 0);
1037 ep_ring = virt_dev->eps[0].ring;
1038 /*
1039 * FIXME we don't keep track of the dequeue pointer very well after a
1040 * Set TR dequeue pointer, so we're setting the dequeue pointer of the
1041 * host to our enqueue pointer. This should only be called after a
1042 * configured device has reset, so all control transfers should have
1043 * been completed or cancelled before the reset.
1044 */
1045 ep0_ctx->deq = cpu_to_le64(xhci_trb_virt_to_dma(ep_ring->enq_seg,
1046 ep_ring->enqueue)
1047 | ep_ring->cycle_state);
1048}
1049
1050/*
1051 * The xHCI roothub may have ports of differing speeds in any order in the port
1052 * status registers.
1053 *
1054 * The xHCI hardware wants to know the roothub port number that the USB device
1055 * is attached to (or the roothub port its ancestor hub is attached to). All we
1056 * know is the index of that port under either the USB 2.0 or the USB 3.0
1057 * roothub, but that doesn't give us the real index into the HW port status
1058 * registers. Call xhci_find_raw_port_number() to get real index.
1059 */
1060static u32 xhci_find_real_port_number(struct xhci_hcd *xhci,
1061 struct usb_device *udev)
1062{
1063 struct usb_device *top_dev;
1064 struct usb_hcd *hcd;
1065
1066 if (udev->speed >= USB_SPEED_SUPER)
1067 hcd = xhci_get_usb3_hcd(xhci);
1068 else
1069 hcd = xhci->main_hcd;
1070
1071 for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
1072 top_dev = top_dev->parent)
1073 /* Found device below root hub */;
1074
1075 return xhci_find_raw_port_number(hcd, top_dev->portnum);
1076}
1077
1078/* Setup an xHCI virtual device for a Set Address command */
1079int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev)
1080{
1081 struct xhci_virt_device *dev;
1082 struct xhci_ep_ctx *ep0_ctx;
1083 struct xhci_slot_ctx *slot_ctx;
1084 u32 port_num;
1085 u32 max_packets;
1086 struct usb_device *top_dev;
1087
1088 dev = xhci->devs[udev->slot_id];
1089 /* Slot ID 0 is reserved */
1090 if (udev->slot_id == 0 || !dev) {
1091 xhci_warn(xhci, "Slot ID %d is not assigned to this device\n",
1092 udev->slot_id);
1093 return -EINVAL;
1094 }
1095 ep0_ctx = xhci_get_ep_ctx(xhci, dev->in_ctx, 0);
1096 slot_ctx = xhci_get_slot_ctx(xhci, dev->in_ctx);
1097
1098 /* 3) Only the control endpoint is valid - one endpoint context */
1099 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route);
1100 switch (udev->speed) {
1101 case USB_SPEED_SUPER_PLUS:
1102 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP);
1103 max_packets = MAX_PACKET(512);
1104 break;
1105 case USB_SPEED_SUPER:
1106 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
1107 max_packets = MAX_PACKET(512);
1108 break;
1109 case USB_SPEED_HIGH:
1110 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS);
1111 max_packets = MAX_PACKET(64);
1112 break;
1113 /* USB core guesses at a 64-byte max packet first for FS devices */
1114 case USB_SPEED_FULL:
1115 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS);
1116 max_packets = MAX_PACKET(64);
1117 break;
1118 case USB_SPEED_LOW:
1119 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_LS);
1120 max_packets = MAX_PACKET(8);
1121 break;
1122 default:
1123 /* Speed was set earlier, this shouldn't happen. */
1124 return -EINVAL;
1125 }
1126 /* Find the root hub port this device is under */
1127 port_num = xhci_find_real_port_number(xhci, udev);
1128 if (!port_num)
1129 return -EINVAL;
1130 slot_ctx->dev_info2 |= cpu_to_le32(ROOT_HUB_PORT(port_num));
1131 /* Set the port number in the virtual_device to the faked port number */
1132 for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
1133 top_dev = top_dev->parent)
1134 /* Found device below root hub */;
1135 dev->fake_port = top_dev->portnum;
1136 dev->real_port = port_num;
1137 xhci_dbg(xhci, "Set root hub portnum to %d\n", port_num);
1138 xhci_dbg(xhci, "Set fake root hub portnum to %d\n", dev->fake_port);
1139
1140 /* Find the right bandwidth table that this device will be a part of.
1141 * If this is a full speed device attached directly to a root port (or a
1142 * decendent of one), it counts as a primary bandwidth domain, not a
1143 * secondary bandwidth domain under a TT. An xhci_tt_info structure
1144 * will never be created for the HS root hub.
1145 */
1146 if (!udev->tt || !udev->tt->hub->parent) {
1147 dev->bw_table = &xhci->rh_bw[port_num - 1].bw_table;
1148 } else {
1149 struct xhci_root_port_bw_info *rh_bw;
1150 struct xhci_tt_bw_info *tt_bw;
1151
1152 rh_bw = &xhci->rh_bw[port_num - 1];
1153 /* Find the right TT. */
1154 list_for_each_entry(tt_bw, &rh_bw->tts, tt_list) {
1155 if (tt_bw->slot_id != udev->tt->hub->slot_id)
1156 continue;
1157
1158 if (!dev->udev->tt->multi ||
1159 (udev->tt->multi &&
1160 tt_bw->ttport == dev->udev->ttport)) {
1161 dev->bw_table = &tt_bw->bw_table;
1162 dev->tt_info = tt_bw;
1163 break;
1164 }
1165 }
1166 if (!dev->tt_info)
1167 xhci_warn(xhci, "WARN: Didn't find a matching TT\n");
1168 }
1169
1170 /* Is this a LS/FS device under an external HS hub? */
1171 if (udev->tt && udev->tt->hub->parent) {
1172 slot_ctx->tt_info = cpu_to_le32(udev->tt->hub->slot_id |
1173 (udev->ttport << 8));
1174 if (udev->tt->multi)
1175 slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
1176 }
1177 xhci_dbg(xhci, "udev->tt = %p\n", udev->tt);
1178 xhci_dbg(xhci, "udev->ttport = 0x%x\n", udev->ttport);
1179
1180 /* Step 4 - ring already allocated */
1181 /* Step 5 */
1182 ep0_ctx->ep_info2 = cpu_to_le32(EP_TYPE(CTRL_EP));
1183
1184 /* EP 0 can handle "burst" sizes of 1, so Max Burst Size field is 0 */
1185 ep0_ctx->ep_info2 |= cpu_to_le32(MAX_BURST(0) | ERROR_COUNT(3) |
1186 max_packets);
1187
1188 ep0_ctx->deq = cpu_to_le64(dev->eps[0].ring->first_seg->dma |
1189 dev->eps[0].ring->cycle_state);
1190
1191 trace_xhci_setup_addressable_virt_device(dev);
1192
1193 /* Steps 7 and 8 were done in xhci_alloc_virt_device() */
1194
1195 return 0;
1196}
1197
1198/*
1199 * Convert interval expressed as 2^(bInterval - 1) == interval into
1200 * straight exponent value 2^n == interval.
1201 *
1202 */
1203static unsigned int xhci_parse_exponent_interval(struct usb_device *udev,
1204 struct usb_host_endpoint *ep)
1205{
1206 unsigned int interval;
1207
1208 interval = clamp_val(ep->desc.bInterval, 1, 16) - 1;
1209 if (interval != ep->desc.bInterval - 1)
1210 dev_warn(&udev->dev,
1211 "ep %#x - rounding interval to %d %sframes\n",
1212 ep->desc.bEndpointAddress,
1213 1 << interval,
1214 udev->speed == USB_SPEED_FULL ? "" : "micro");
1215
1216 if (udev->speed == USB_SPEED_FULL) {
1217 /*
1218 * Full speed isoc endpoints specify interval in frames,
1219 * not microframes. We are using microframes everywhere,
1220 * so adjust accordingly.
1221 */
1222 interval += 3; /* 1 frame = 2^3 uframes */
1223 }
1224
1225 return interval;
1226}
1227
1228/*
1229 * Convert bInterval expressed in microframes (in 1-255 range) to exponent of
1230 * microframes, rounded down to nearest power of 2.
1231 */
1232static unsigned int xhci_microframes_to_exponent(struct usb_device *udev,
1233 struct usb_host_endpoint *ep, unsigned int desc_interval,
1234 unsigned int min_exponent, unsigned int max_exponent)
1235{
1236 unsigned int interval;
1237
1238 interval = fls(desc_interval) - 1;
1239 interval = clamp_val(interval, min_exponent, max_exponent);
1240 if ((1 << interval) != desc_interval)
1241 dev_dbg(&udev->dev,
1242 "ep %#x - rounding interval to %d microframes, ep desc says %d microframes\n",
1243 ep->desc.bEndpointAddress,
1244 1 << interval,
1245 desc_interval);
1246
1247 return interval;
1248}
1249
1250static unsigned int xhci_parse_microframe_interval(struct usb_device *udev,
1251 struct usb_host_endpoint *ep)
1252{
1253 if (ep->desc.bInterval == 0)
1254 return 0;
1255 return xhci_microframes_to_exponent(udev, ep,
1256 ep->desc.bInterval, 0, 15);
1257}
1258
1259
1260static unsigned int xhci_parse_frame_interval(struct usb_device *udev,
1261 struct usb_host_endpoint *ep)
1262{
1263 return xhci_microframes_to_exponent(udev, ep,
1264 ep->desc.bInterval * 8, 3, 10);
1265}
1266
1267/* Return the polling or NAK interval.
1268 *
1269 * The polling interval is expressed in "microframes". If xHCI's Interval field
1270 * is set to N, it will service the endpoint every 2^(Interval)*125us.
1271 *
1272 * The NAK interval is one NAK per 1 to 255 microframes, or no NAKs if interval
1273 * is set to 0.
1274 */
1275static unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
1276 struct usb_host_endpoint *ep)
1277{
1278 unsigned int interval = 0;
1279
1280 switch (udev->speed) {
1281 case USB_SPEED_HIGH:
1282 /* Max NAK rate */
1283 if (usb_endpoint_xfer_control(&ep->desc) ||
1284 usb_endpoint_xfer_bulk(&ep->desc)) {
1285 interval = xhci_parse_microframe_interval(udev, ep);
1286 break;
1287 }
1288 fallthrough; /* SS and HS isoc/int have same decoding */
1289
1290 case USB_SPEED_SUPER_PLUS:
1291 case USB_SPEED_SUPER:
1292 if (usb_endpoint_xfer_int(&ep->desc) ||
1293 usb_endpoint_xfer_isoc(&ep->desc)) {
1294 interval = xhci_parse_exponent_interval(udev, ep);
1295 }
1296 break;
1297
1298 case USB_SPEED_FULL:
1299 if (usb_endpoint_xfer_isoc(&ep->desc)) {
1300 interval = xhci_parse_exponent_interval(udev, ep);
1301 break;
1302 }
1303 /*
1304 * Fall through for interrupt endpoint interval decoding
1305 * since it uses the same rules as low speed interrupt
1306 * endpoints.
1307 */
1308 fallthrough;
1309
1310 case USB_SPEED_LOW:
1311 if (usb_endpoint_xfer_int(&ep->desc) ||
1312 usb_endpoint_xfer_isoc(&ep->desc)) {
1313
1314 interval = xhci_parse_frame_interval(udev, ep);
1315 }
1316 break;
1317
1318 default:
1319 BUG();
1320 }
1321 return interval;
1322}
1323
1324/* The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps.
1325 * High speed endpoint descriptors can define "the number of additional
1326 * transaction opportunities per microframe", but that goes in the Max Burst
1327 * endpoint context field.
1328 */
1329static u32 xhci_get_endpoint_mult(struct usb_device *udev,
1330 struct usb_host_endpoint *ep)
1331{
1332 if (udev->speed < USB_SPEED_SUPER ||
1333 !usb_endpoint_xfer_isoc(&ep->desc))
1334 return 0;
1335 return ep->ss_ep_comp.bmAttributes;
1336}
1337
1338static u32 xhci_get_endpoint_max_burst(struct usb_device *udev,
1339 struct usb_host_endpoint *ep)
1340{
1341 /* Super speed and Plus have max burst in ep companion desc */
1342 if (udev->speed >= USB_SPEED_SUPER)
1343 return ep->ss_ep_comp.bMaxBurst;
1344
1345 if (udev->speed == USB_SPEED_HIGH &&
1346 (usb_endpoint_xfer_isoc(&ep->desc) ||
1347 usb_endpoint_xfer_int(&ep->desc)))
1348 return usb_endpoint_maxp_mult(&ep->desc) - 1;
1349
1350 return 0;
1351}
1352
1353static u32 xhci_get_endpoint_type(struct usb_host_endpoint *ep)
1354{
1355 int in;
1356
1357 in = usb_endpoint_dir_in(&ep->desc);
1358
1359 switch (usb_endpoint_type(&ep->desc)) {
1360 case USB_ENDPOINT_XFER_CONTROL:
1361 return CTRL_EP;
1362 case USB_ENDPOINT_XFER_BULK:
1363 return in ? BULK_IN_EP : BULK_OUT_EP;
1364 case USB_ENDPOINT_XFER_ISOC:
1365 return in ? ISOC_IN_EP : ISOC_OUT_EP;
1366 case USB_ENDPOINT_XFER_INT:
1367 return in ? INT_IN_EP : INT_OUT_EP;
1368 }
1369 return 0;
1370}
1371
1372/* Return the maximum endpoint service interval time (ESIT) payload.
1373 * Basically, this is the maxpacket size, multiplied by the burst size
1374 * and mult size.
1375 */
1376static u32 xhci_get_max_esit_payload(struct usb_device *udev,
1377 struct usb_host_endpoint *ep)
1378{
1379 int max_burst;
1380 int max_packet;
1381
1382 /* Only applies for interrupt or isochronous endpoints */
1383 if (usb_endpoint_xfer_control(&ep->desc) ||
1384 usb_endpoint_xfer_bulk(&ep->desc))
1385 return 0;
1386
1387 /* SuperSpeedPlus Isoc ep sending over 48k per esit */
1388 if ((udev->speed >= USB_SPEED_SUPER_PLUS) &&
1389 USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes))
1390 return le32_to_cpu(ep->ssp_isoc_ep_comp.dwBytesPerInterval);
1391
1392 /* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */
1393 if (udev->speed >= USB_SPEED_SUPER)
1394 return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval);
1395
1396 max_packet = usb_endpoint_maxp(&ep->desc);
1397 max_burst = usb_endpoint_maxp_mult(&ep->desc);
1398 /* A 0 in max burst means 1 transfer per ESIT */
1399 return max_packet * max_burst;
1400}
1401
1402/* Set up an endpoint with one ring segment. Do not allocate stream rings.
1403 * Drivers will have to call usb_alloc_streams() to do that.
1404 */
1405int xhci_endpoint_init(struct xhci_hcd *xhci,
1406 struct xhci_virt_device *virt_dev,
1407 struct usb_device *udev,
1408 struct usb_host_endpoint *ep,
1409 gfp_t mem_flags)
1410{
1411 unsigned int ep_index;
1412 struct xhci_ep_ctx *ep_ctx;
1413 struct xhci_ring *ep_ring;
1414 unsigned int max_packet;
1415 enum xhci_ring_type ring_type;
1416 u32 max_esit_payload;
1417 u32 endpoint_type;
1418 unsigned int max_burst;
1419 unsigned int interval;
1420 unsigned int mult;
1421 unsigned int avg_trb_len;
1422 unsigned int err_count = 0;
1423
1424 ep_index = xhci_get_endpoint_index(&ep->desc);
1425 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
1426
1427 endpoint_type = xhci_get_endpoint_type(ep);
1428 if (!endpoint_type)
1429 return -EINVAL;
1430
1431 ring_type = usb_endpoint_type(&ep->desc);
1432
1433 /*
1434 * Get values to fill the endpoint context, mostly from ep descriptor.
1435 * The average TRB buffer lengt for bulk endpoints is unclear as we
1436 * have no clue on scatter gather list entry size. For Isoc and Int,
1437 * set it to max available. See xHCI 1.1 spec 4.14.1.1 for details.
1438 */
1439 max_esit_payload = xhci_get_max_esit_payload(udev, ep);
1440 interval = xhci_get_endpoint_interval(udev, ep);
1441
1442 /* Periodic endpoint bInterval limit quirk */
1443 if (usb_endpoint_xfer_int(&ep->desc) ||
1444 usb_endpoint_xfer_isoc(&ep->desc)) {
1445 if ((xhci->quirks & XHCI_LIMIT_ENDPOINT_INTERVAL_7) &&
1446 udev->speed >= USB_SPEED_HIGH &&
1447 interval >= 7) {
1448 interval = 6;
1449 }
1450 }
1451
1452 mult = xhci_get_endpoint_mult(udev, ep);
1453 max_packet = usb_endpoint_maxp(&ep->desc);
1454 max_burst = xhci_get_endpoint_max_burst(udev, ep);
1455 avg_trb_len = max_esit_payload;
1456
1457 /* FIXME dig Mult and streams info out of ep companion desc */
1458
1459 /* Allow 3 retries for everything but isoc, set CErr = 3 */
1460 if (!usb_endpoint_xfer_isoc(&ep->desc))
1461 err_count = 3;
1462 /* HS bulk max packet should be 512, FS bulk supports 8, 16, 32 or 64 */
1463 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1464 if (udev->speed == USB_SPEED_HIGH)
1465 max_packet = 512;
1466 if (udev->speed == USB_SPEED_FULL) {
1467 max_packet = rounddown_pow_of_two(max_packet);
1468 max_packet = clamp_val(max_packet, 8, 64);
1469 }
1470 }
1471 /* xHCI 1.0 and 1.1 indicates that ctrl ep avg TRB Length should be 8 */
1472 if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version >= 0x100)
1473 avg_trb_len = 8;
1474 /* xhci 1.1 with LEC support doesn't use mult field, use RsvdZ */
1475 if ((xhci->hci_version > 0x100) && HCC2_LEC(xhci->hcc_params2))
1476 mult = 0;
1477
1478 /* Set up the endpoint ring */
1479 virt_dev->eps[ep_index].new_ring =
1480 xhci_ring_alloc(xhci, 2, 1, ring_type, max_packet, mem_flags);
1481 if (!virt_dev->eps[ep_index].new_ring)
1482 return -ENOMEM;
1483
1484 virt_dev->eps[ep_index].skip = false;
1485 ep_ring = virt_dev->eps[ep_index].new_ring;
1486
1487 /* Fill the endpoint context */
1488 ep_ctx->ep_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_HI(max_esit_payload) |
1489 EP_INTERVAL(interval) |
1490 EP_MULT(mult));
1491 ep_ctx->ep_info2 = cpu_to_le32(EP_TYPE(endpoint_type) |
1492 MAX_PACKET(max_packet) |
1493 MAX_BURST(max_burst) |
1494 ERROR_COUNT(err_count));
1495 ep_ctx->deq = cpu_to_le64(ep_ring->first_seg->dma |
1496 ep_ring->cycle_state);
1497
1498 ep_ctx->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) |
1499 EP_AVG_TRB_LENGTH(avg_trb_len));
1500
1501 return 0;
1502}
1503
1504void xhci_endpoint_zero(struct xhci_hcd *xhci,
1505 struct xhci_virt_device *virt_dev,
1506 struct usb_host_endpoint *ep)
1507{
1508 unsigned int ep_index;
1509 struct xhci_ep_ctx *ep_ctx;
1510
1511 ep_index = xhci_get_endpoint_index(&ep->desc);
1512 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
1513
1514 ep_ctx->ep_info = 0;
1515 ep_ctx->ep_info2 = 0;
1516 ep_ctx->deq = 0;
1517 ep_ctx->tx_info = 0;
1518 /* Don't free the endpoint ring until the set interface or configuration
1519 * request succeeds.
1520 */
1521}
1522
1523void xhci_clear_endpoint_bw_info(struct xhci_bw_info *bw_info)
1524{
1525 bw_info->ep_interval = 0;
1526 bw_info->mult = 0;
1527 bw_info->num_packets = 0;
1528 bw_info->max_packet_size = 0;
1529 bw_info->type = 0;
1530 bw_info->max_esit_payload = 0;
1531}
1532
1533void xhci_update_bw_info(struct xhci_hcd *xhci,
1534 struct xhci_container_ctx *in_ctx,
1535 struct xhci_input_control_ctx *ctrl_ctx,
1536 struct xhci_virt_device *virt_dev)
1537{
1538 struct xhci_bw_info *bw_info;
1539 struct xhci_ep_ctx *ep_ctx;
1540 unsigned int ep_type;
1541 int i;
1542
1543 for (i = 1; i < 31; i++) {
1544 bw_info = &virt_dev->eps[i].bw_info;
1545
1546 /* We can't tell what endpoint type is being dropped, but
1547 * unconditionally clearing the bandwidth info for non-periodic
1548 * endpoints should be harmless because the info will never be
1549 * set in the first place.
1550 */
1551 if (!EP_IS_ADDED(ctrl_ctx, i) && EP_IS_DROPPED(ctrl_ctx, i)) {
1552 /* Dropped endpoint */
1553 xhci_clear_endpoint_bw_info(bw_info);
1554 continue;
1555 }
1556
1557 if (EP_IS_ADDED(ctrl_ctx, i)) {
1558 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, i);
1559 ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
1560
1561 /* Ignore non-periodic endpoints */
1562 if (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP &&
1563 ep_type != ISOC_IN_EP &&
1564 ep_type != INT_IN_EP)
1565 continue;
1566
1567 /* Added or changed endpoint */
1568 bw_info->ep_interval = CTX_TO_EP_INTERVAL(
1569 le32_to_cpu(ep_ctx->ep_info));
1570 /* Number of packets and mult are zero-based in the
1571 * input context, but we want one-based for the
1572 * interval table.
1573 */
1574 bw_info->mult = CTX_TO_EP_MULT(
1575 le32_to_cpu(ep_ctx->ep_info)) + 1;
1576 bw_info->num_packets = CTX_TO_MAX_BURST(
1577 le32_to_cpu(ep_ctx->ep_info2)) + 1;
1578 bw_info->max_packet_size = MAX_PACKET_DECODED(
1579 le32_to_cpu(ep_ctx->ep_info2));
1580 bw_info->type = ep_type;
1581 bw_info->max_esit_payload = CTX_TO_MAX_ESIT_PAYLOAD(
1582 le32_to_cpu(ep_ctx->tx_info));
1583 }
1584 }
1585}
1586
1587/* Copy output xhci_ep_ctx to the input xhci_ep_ctx copy.
1588 * Useful when you want to change one particular aspect of the endpoint and then
1589 * issue a configure endpoint command.
1590 */
1591void xhci_endpoint_copy(struct xhci_hcd *xhci,
1592 struct xhci_container_ctx *in_ctx,
1593 struct xhci_container_ctx *out_ctx,
1594 unsigned int ep_index)
1595{
1596 struct xhci_ep_ctx *out_ep_ctx;
1597 struct xhci_ep_ctx *in_ep_ctx;
1598
1599 out_ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1600 in_ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
1601
1602 in_ep_ctx->ep_info = out_ep_ctx->ep_info;
1603 in_ep_ctx->ep_info2 = out_ep_ctx->ep_info2;
1604 in_ep_ctx->deq = out_ep_ctx->deq;
1605 in_ep_ctx->tx_info = out_ep_ctx->tx_info;
1606 if (xhci->quirks & XHCI_MTK_HOST) {
1607 in_ep_ctx->reserved[0] = out_ep_ctx->reserved[0];
1608 in_ep_ctx->reserved[1] = out_ep_ctx->reserved[1];
1609 }
1610}
1611
1612/* Copy output xhci_slot_ctx to the input xhci_slot_ctx.
1613 * Useful when you want to change one particular aspect of the endpoint and then
1614 * issue a configure endpoint command. Only the context entries field matters,
1615 * but we'll copy the whole thing anyway.
1616 */
1617void xhci_slot_copy(struct xhci_hcd *xhci,
1618 struct xhci_container_ctx *in_ctx,
1619 struct xhci_container_ctx *out_ctx)
1620{
1621 struct xhci_slot_ctx *in_slot_ctx;
1622 struct xhci_slot_ctx *out_slot_ctx;
1623
1624 in_slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1625 out_slot_ctx = xhci_get_slot_ctx(xhci, out_ctx);
1626
1627 in_slot_ctx->dev_info = out_slot_ctx->dev_info;
1628 in_slot_ctx->dev_info2 = out_slot_ctx->dev_info2;
1629 in_slot_ctx->tt_info = out_slot_ctx->tt_info;
1630 in_slot_ctx->dev_state = out_slot_ctx->dev_state;
1631}
1632
1633/* Set up the scratchpad buffer array and scratchpad buffers, if needed. */
1634static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
1635{
1636 int i;
1637 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
1638 int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
1639
1640 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1641 "Allocating %d scratchpad buffers", num_sp);
1642
1643 if (!num_sp)
1644 return 0;
1645
1646 xhci->scratchpad = kzalloc_node(sizeof(*xhci->scratchpad), flags,
1647 dev_to_node(dev));
1648 if (!xhci->scratchpad)
1649 goto fail_sp;
1650
1651 xhci->scratchpad->sp_array = dma_alloc_coherent(dev,
1652 size_mul(sizeof(u64), num_sp),
1653 &xhci->scratchpad->sp_dma, flags);
1654 if (!xhci->scratchpad->sp_array)
1655 goto fail_sp2;
1656
1657 xhci->scratchpad->sp_buffers = kcalloc_node(num_sp, sizeof(void *),
1658 flags, dev_to_node(dev));
1659 if (!xhci->scratchpad->sp_buffers)
1660 goto fail_sp3;
1661
1662 xhci->dcbaa->dev_context_ptrs[0] = cpu_to_le64(xhci->scratchpad->sp_dma);
1663 for (i = 0; i < num_sp; i++) {
1664 dma_addr_t dma;
1665 void *buf = dma_alloc_coherent(dev, xhci->page_size, &dma,
1666 flags);
1667 if (!buf)
1668 goto fail_sp4;
1669
1670 xhci->scratchpad->sp_array[i] = dma;
1671 xhci->scratchpad->sp_buffers[i] = buf;
1672 }
1673
1674 return 0;
1675
1676 fail_sp4:
1677 while (i--)
1678 dma_free_coherent(dev, xhci->page_size,
1679 xhci->scratchpad->sp_buffers[i],
1680 xhci->scratchpad->sp_array[i]);
1681
1682 kfree(xhci->scratchpad->sp_buffers);
1683
1684 fail_sp3:
1685 dma_free_coherent(dev, num_sp * sizeof(u64),
1686 xhci->scratchpad->sp_array,
1687 xhci->scratchpad->sp_dma);
1688
1689 fail_sp2:
1690 kfree(xhci->scratchpad);
1691 xhci->scratchpad = NULL;
1692
1693 fail_sp:
1694 return -ENOMEM;
1695}
1696
1697static void scratchpad_free(struct xhci_hcd *xhci)
1698{
1699 int num_sp;
1700 int i;
1701 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
1702
1703 if (!xhci->scratchpad)
1704 return;
1705
1706 num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
1707
1708 for (i = 0; i < num_sp; i++) {
1709 dma_free_coherent(dev, xhci->page_size,
1710 xhci->scratchpad->sp_buffers[i],
1711 xhci->scratchpad->sp_array[i]);
1712 }
1713 kfree(xhci->scratchpad->sp_buffers);
1714 dma_free_coherent(dev, num_sp * sizeof(u64),
1715 xhci->scratchpad->sp_array,
1716 xhci->scratchpad->sp_dma);
1717 kfree(xhci->scratchpad);
1718 xhci->scratchpad = NULL;
1719}
1720
1721struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
1722 bool allocate_completion, gfp_t mem_flags)
1723{
1724 struct xhci_command *command;
1725 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
1726
1727 command = kzalloc_node(sizeof(*command), mem_flags, dev_to_node(dev));
1728 if (!command)
1729 return NULL;
1730
1731 if (allocate_completion) {
1732 command->completion =
1733 kzalloc_node(sizeof(struct completion), mem_flags,
1734 dev_to_node(dev));
1735 if (!command->completion) {
1736 kfree(command);
1737 return NULL;
1738 }
1739 init_completion(command->completion);
1740 }
1741
1742 command->status = 0;
1743 /* set default timeout to 5000 ms */
1744 command->timeout_ms = XHCI_CMD_DEFAULT_TIMEOUT;
1745 INIT_LIST_HEAD(&command->cmd_list);
1746 return command;
1747}
1748
1749struct xhci_command *xhci_alloc_command_with_ctx(struct xhci_hcd *xhci,
1750 bool allocate_completion, gfp_t mem_flags)
1751{
1752 struct xhci_command *command;
1753
1754 command = xhci_alloc_command(xhci, allocate_completion, mem_flags);
1755 if (!command)
1756 return NULL;
1757
1758 command->in_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT,
1759 mem_flags);
1760 if (!command->in_ctx) {
1761 kfree(command->completion);
1762 kfree(command);
1763 return NULL;
1764 }
1765 return command;
1766}
1767
1768void xhci_urb_free_priv(struct urb_priv *urb_priv)
1769{
1770 kfree(urb_priv);
1771}
1772
1773void xhci_free_command(struct xhci_hcd *xhci,
1774 struct xhci_command *command)
1775{
1776 xhci_free_container_ctx(xhci,
1777 command->in_ctx);
1778 kfree(command->completion);
1779 kfree(command);
1780}
1781
1782static int xhci_alloc_erst(struct xhci_hcd *xhci,
1783 struct xhci_ring *evt_ring,
1784 struct xhci_erst *erst,
1785 gfp_t flags)
1786{
1787 size_t size;
1788 unsigned int val;
1789 struct xhci_segment *seg;
1790 struct xhci_erst_entry *entry;
1791
1792 size = size_mul(sizeof(struct xhci_erst_entry), evt_ring->num_segs);
1793 erst->entries = dma_alloc_coherent(xhci_to_hcd(xhci)->self.sysdev,
1794 size, &erst->erst_dma_addr, flags);
1795 if (!erst->entries)
1796 return -ENOMEM;
1797
1798 erst->num_entries = evt_ring->num_segs;
1799
1800 seg = evt_ring->first_seg;
1801 for (val = 0; val < evt_ring->num_segs; val++) {
1802 entry = &erst->entries[val];
1803 entry->seg_addr = cpu_to_le64(seg->dma);
1804 entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT);
1805 entry->rsvd = 0;
1806 seg = seg->next;
1807 }
1808
1809 return 0;
1810}
1811
1812static void
1813xhci_remove_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
1814{
1815 u32 tmp;
1816
1817 if (!ir)
1818 return;
1819
1820 /*
1821 * Clean out interrupter registers except ERSTBA. Clearing either the
1822 * low or high 32 bits of ERSTBA immediately causes the controller to
1823 * dereference the partially cleared 64 bit address, causing IOMMU error.
1824 */
1825 if (ir->ir_set) {
1826 tmp = readl(&ir->ir_set->erst_size);
1827 tmp &= ERST_SIZE_MASK;
1828 writel(tmp, &ir->ir_set->erst_size);
1829
1830 xhci_write_64(xhci, ERST_EHB, &ir->ir_set->erst_dequeue);
1831 }
1832}
1833
1834static void
1835xhci_free_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
1836{
1837 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
1838 size_t erst_size;
1839
1840 if (!ir)
1841 return;
1842
1843 erst_size = sizeof(struct xhci_erst_entry) * ir->erst.num_entries;
1844 if (ir->erst.entries)
1845 dma_free_coherent(dev, erst_size,
1846 ir->erst.entries,
1847 ir->erst.erst_dma_addr);
1848 ir->erst.entries = NULL;
1849
1850 /* free interrupter event ring */
1851 if (ir->event_ring)
1852 xhci_ring_free(xhci, ir->event_ring);
1853
1854 ir->event_ring = NULL;
1855
1856 kfree(ir);
1857}
1858
1859void xhci_remove_secondary_interrupter(struct usb_hcd *hcd, struct xhci_interrupter *ir)
1860{
1861 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1862 unsigned int intr_num;
1863
1864 spin_lock_irq(&xhci->lock);
1865
1866 /* interrupter 0 is primary interrupter, don't touch it */
1867 if (!ir || !ir->intr_num || ir->intr_num >= xhci->max_interrupters) {
1868 xhci_dbg(xhci, "Invalid secondary interrupter, can't remove\n");
1869 spin_unlock_irq(&xhci->lock);
1870 return;
1871 }
1872
1873 intr_num = ir->intr_num;
1874
1875 xhci_remove_interrupter(xhci, ir);
1876 xhci->interrupters[intr_num] = NULL;
1877
1878 spin_unlock_irq(&xhci->lock);
1879
1880 xhci_free_interrupter(xhci, ir);
1881}
1882EXPORT_SYMBOL_GPL(xhci_remove_secondary_interrupter);
1883
1884void xhci_mem_cleanup(struct xhci_hcd *xhci)
1885{
1886 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
1887 int i, j, num_ports;
1888
1889 cancel_delayed_work_sync(&xhci->cmd_timer);
1890
1891 for (i = 0; i < xhci->max_interrupters; i++) {
1892 if (xhci->interrupters[i]) {
1893 xhci_remove_interrupter(xhci, xhci->interrupters[i]);
1894 xhci_free_interrupter(xhci, xhci->interrupters[i]);
1895 xhci->interrupters[i] = NULL;
1896 }
1897 }
1898 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed interrupters");
1899
1900 if (xhci->cmd_ring)
1901 xhci_ring_free(xhci, xhci->cmd_ring);
1902 xhci->cmd_ring = NULL;
1903 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed command ring");
1904 xhci_cleanup_command_queue(xhci);
1905
1906 num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
1907 for (i = 0; i < num_ports && xhci->rh_bw; i++) {
1908 struct xhci_interval_bw_table *bwt = &xhci->rh_bw[i].bw_table;
1909 for (j = 0; j < XHCI_MAX_INTERVAL; j++) {
1910 struct list_head *ep = &bwt->interval_bw[j].endpoints;
1911 while (!list_empty(ep))
1912 list_del_init(ep->next);
1913 }
1914 }
1915
1916 for (i = HCS_MAX_SLOTS(xhci->hcs_params1); i > 0; i--)
1917 xhci_free_virt_devices_depth_first(xhci, i);
1918
1919 dma_pool_destroy(xhci->segment_pool);
1920 xhci->segment_pool = NULL;
1921 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed segment pool");
1922
1923 dma_pool_destroy(xhci->device_pool);
1924 xhci->device_pool = NULL;
1925 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed device context pool");
1926
1927 dma_pool_destroy(xhci->small_streams_pool);
1928 xhci->small_streams_pool = NULL;
1929 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1930 "Freed small stream array pool");
1931
1932 dma_pool_destroy(xhci->medium_streams_pool);
1933 xhci->medium_streams_pool = NULL;
1934 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1935 "Freed medium stream array pool");
1936
1937 if (xhci->dcbaa)
1938 dma_free_coherent(dev, sizeof(*xhci->dcbaa),
1939 xhci->dcbaa, xhci->dcbaa->dma);
1940 xhci->dcbaa = NULL;
1941
1942 scratchpad_free(xhci);
1943
1944 if (!xhci->rh_bw)
1945 goto no_bw;
1946
1947 for (i = 0; i < num_ports; i++) {
1948 struct xhci_tt_bw_info *tt, *n;
1949 list_for_each_entry_safe(tt, n, &xhci->rh_bw[i].tts, tt_list) {
1950 list_del(&tt->tt_list);
1951 kfree(tt);
1952 }
1953 }
1954
1955no_bw:
1956 xhci->cmd_ring_reserved_trbs = 0;
1957 xhci->usb2_rhub.num_ports = 0;
1958 xhci->usb3_rhub.num_ports = 0;
1959 xhci->num_active_eps = 0;
1960 kfree(xhci->usb2_rhub.ports);
1961 kfree(xhci->usb3_rhub.ports);
1962 kfree(xhci->hw_ports);
1963 kfree(xhci->rh_bw);
1964 kfree(xhci->ext_caps);
1965 for (i = 0; i < xhci->num_port_caps; i++)
1966 kfree(xhci->port_caps[i].psi);
1967 kfree(xhci->port_caps);
1968 kfree(xhci->interrupters);
1969 xhci->num_port_caps = 0;
1970
1971 xhci->usb2_rhub.ports = NULL;
1972 xhci->usb3_rhub.ports = NULL;
1973 xhci->hw_ports = NULL;
1974 xhci->rh_bw = NULL;
1975 xhci->ext_caps = NULL;
1976 xhci->port_caps = NULL;
1977 xhci->interrupters = NULL;
1978
1979 xhci->page_size = 0;
1980 xhci->page_shift = 0;
1981 xhci->usb2_rhub.bus_state.bus_suspended = 0;
1982 xhci->usb3_rhub.bus_state.bus_suspended = 0;
1983}
1984
1985static void xhci_set_hc_event_deq(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
1986{
1987 dma_addr_t deq;
1988
1989 deq = xhci_trb_virt_to_dma(ir->event_ring->deq_seg,
1990 ir->event_ring->dequeue);
1991 if (!deq)
1992 xhci_warn(xhci, "WARN something wrong with SW event ring dequeue ptr.\n");
1993 /* Update HC event ring dequeue pointer */
1994 /* Don't clear the EHB bit (which is RW1C) because
1995 * there might be more events to service.
1996 */
1997 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1998 "// Write event ring dequeue pointer, preserving EHB bit");
1999 xhci_write_64(xhci, deq & ERST_PTR_MASK, &ir->ir_set->erst_dequeue);
2000}
2001
2002static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
2003 __le32 __iomem *addr, int max_caps)
2004{
2005 u32 temp, port_offset, port_count;
2006 int i;
2007 u8 major_revision, minor_revision, tmp_minor_revision;
2008 struct xhci_hub *rhub;
2009 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
2010 struct xhci_port_cap *port_cap;
2011
2012 temp = readl(addr);
2013 major_revision = XHCI_EXT_PORT_MAJOR(temp);
2014 minor_revision = XHCI_EXT_PORT_MINOR(temp);
2015
2016 if (major_revision == 0x03) {
2017 rhub = &xhci->usb3_rhub;
2018 /*
2019 * Some hosts incorrectly use sub-minor version for minor
2020 * version (i.e. 0x02 instead of 0x20 for bcdUSB 0x320 and 0x01
2021 * for bcdUSB 0x310). Since there is no USB release with sub
2022 * minor version 0x301 to 0x309, we can assume that they are
2023 * incorrect and fix it here.
2024 */
2025 if (minor_revision > 0x00 && minor_revision < 0x10)
2026 minor_revision <<= 4;
2027 /*
2028 * Some zhaoxin's xHCI controller that follow usb3.1 spec
2029 * but only support Gen1.
2030 */
2031 if (xhci->quirks & XHCI_ZHAOXIN_HOST) {
2032 tmp_minor_revision = minor_revision;
2033 minor_revision = 0;
2034 }
2035
2036 } else if (major_revision <= 0x02) {
2037 rhub = &xhci->usb2_rhub;
2038 } else {
2039 xhci_warn(xhci, "Ignoring unknown port speed, Ext Cap %p, revision = 0x%x\n",
2040 addr, major_revision);
2041 /* Ignoring port protocol we can't understand. FIXME */
2042 return;
2043 }
2044
2045 /* Port offset and count in the third dword, see section 7.2 */
2046 temp = readl(addr + 2);
2047 port_offset = XHCI_EXT_PORT_OFF(temp);
2048 port_count = XHCI_EXT_PORT_COUNT(temp);
2049 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2050 "Ext Cap %p, port offset = %u, count = %u, revision = 0x%x",
2051 addr, port_offset, port_count, major_revision);
2052 /* Port count includes the current port offset */
2053 if (port_offset == 0 || (port_offset + port_count - 1) > num_ports)
2054 /* WTF? "Valid values are ‘1’ to MaxPorts" */
2055 return;
2056
2057 port_cap = &xhci->port_caps[xhci->num_port_caps++];
2058 if (xhci->num_port_caps > max_caps)
2059 return;
2060
2061 port_cap->psi_count = XHCI_EXT_PORT_PSIC(temp);
2062
2063 if (port_cap->psi_count) {
2064 port_cap->psi = kcalloc_node(port_cap->psi_count,
2065 sizeof(*port_cap->psi),
2066 GFP_KERNEL, dev_to_node(dev));
2067 if (!port_cap->psi)
2068 port_cap->psi_count = 0;
2069
2070 port_cap->psi_uid_count++;
2071 for (i = 0; i < port_cap->psi_count; i++) {
2072 port_cap->psi[i] = readl(addr + 4 + i);
2073
2074 /* count unique ID values, two consecutive entries can
2075 * have the same ID if link is assymetric
2076 */
2077 if (i && (XHCI_EXT_PORT_PSIV(port_cap->psi[i]) !=
2078 XHCI_EXT_PORT_PSIV(port_cap->psi[i - 1])))
2079 port_cap->psi_uid_count++;
2080
2081 if (xhci->quirks & XHCI_ZHAOXIN_HOST &&
2082 major_revision == 0x03 &&
2083 XHCI_EXT_PORT_PSIV(port_cap->psi[i]) >= 5)
2084 minor_revision = tmp_minor_revision;
2085
2086 xhci_dbg(xhci, "PSIV:%d PSIE:%d PLT:%d PFD:%d LP:%d PSIM:%d\n",
2087 XHCI_EXT_PORT_PSIV(port_cap->psi[i]),
2088 XHCI_EXT_PORT_PSIE(port_cap->psi[i]),
2089 XHCI_EXT_PORT_PLT(port_cap->psi[i]),
2090 XHCI_EXT_PORT_PFD(port_cap->psi[i]),
2091 XHCI_EXT_PORT_LP(port_cap->psi[i]),
2092 XHCI_EXT_PORT_PSIM(port_cap->psi[i]));
2093 }
2094 }
2095
2096 rhub->maj_rev = major_revision;
2097
2098 if (rhub->min_rev < minor_revision)
2099 rhub->min_rev = minor_revision;
2100
2101 port_cap->maj_rev = major_revision;
2102 port_cap->min_rev = minor_revision;
2103
2104 /* cache usb2 port capabilities */
2105 if (major_revision < 0x03 && xhci->num_ext_caps < max_caps)
2106 xhci->ext_caps[xhci->num_ext_caps++] = temp;
2107
2108 if ((xhci->hci_version >= 0x100) && (major_revision != 0x03) &&
2109 (temp & XHCI_HLC)) {
2110 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2111 "xHCI 1.0: support USB2 hardware lpm");
2112 xhci->hw_lpm_support = 1;
2113 }
2114
2115 port_offset--;
2116 for (i = port_offset; i < (port_offset + port_count); i++) {
2117 struct xhci_port *hw_port = &xhci->hw_ports[i];
2118 /* Duplicate entry. Ignore the port if the revisions differ. */
2119 if (hw_port->rhub) {
2120 xhci_warn(xhci, "Duplicate port entry, Ext Cap %p, port %u\n", addr, i);
2121 xhci_warn(xhci, "Port was marked as USB %u, duplicated as USB %u\n",
2122 hw_port->rhub->maj_rev, major_revision);
2123 /* Only adjust the roothub port counts if we haven't
2124 * found a similar duplicate.
2125 */
2126 if (hw_port->rhub != rhub &&
2127 hw_port->hcd_portnum != DUPLICATE_ENTRY) {
2128 hw_port->rhub->num_ports--;
2129 hw_port->hcd_portnum = DUPLICATE_ENTRY;
2130 }
2131 continue;
2132 }
2133 hw_port->rhub = rhub;
2134 hw_port->port_cap = port_cap;
2135 rhub->num_ports++;
2136 }
2137 /* FIXME: Should we disable ports not in the Extended Capabilities? */
2138}
2139
2140static void xhci_create_rhub_port_array(struct xhci_hcd *xhci,
2141 struct xhci_hub *rhub, gfp_t flags)
2142{
2143 int port_index = 0;
2144 int i;
2145 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
2146
2147 if (!rhub->num_ports)
2148 return;
2149 rhub->ports = kcalloc_node(rhub->num_ports, sizeof(*rhub->ports),
2150 flags, dev_to_node(dev));
2151 if (!rhub->ports)
2152 return;
2153
2154 for (i = 0; i < HCS_MAX_PORTS(xhci->hcs_params1); i++) {
2155 if (xhci->hw_ports[i].rhub != rhub ||
2156 xhci->hw_ports[i].hcd_portnum == DUPLICATE_ENTRY)
2157 continue;
2158 xhci->hw_ports[i].hcd_portnum = port_index;
2159 rhub->ports[port_index] = &xhci->hw_ports[i];
2160 port_index++;
2161 if (port_index == rhub->num_ports)
2162 break;
2163 }
2164}
2165
2166/*
2167 * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that
2168 * specify what speeds each port is supposed to be. We can't count on the port
2169 * speed bits in the PORTSC register being correct until a device is connected,
2170 * but we need to set up the two fake roothubs with the correct number of USB
2171 * 3.0 and USB 2.0 ports at host controller initialization time.
2172 */
2173static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
2174{
2175 void __iomem *base;
2176 u32 offset;
2177 unsigned int num_ports;
2178 int i, j;
2179 int cap_count = 0;
2180 u32 cap_start;
2181 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
2182
2183 num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
2184 xhci->hw_ports = kcalloc_node(num_ports, sizeof(*xhci->hw_ports),
2185 flags, dev_to_node(dev));
2186 if (!xhci->hw_ports)
2187 return -ENOMEM;
2188
2189 for (i = 0; i < num_ports; i++) {
2190 xhci->hw_ports[i].addr = &xhci->op_regs->port_status_base +
2191 NUM_PORT_REGS * i;
2192 xhci->hw_ports[i].hw_portnum = i;
2193
2194 init_completion(&xhci->hw_ports[i].rexit_done);
2195 init_completion(&xhci->hw_ports[i].u3exit_done);
2196 }
2197
2198 xhci->rh_bw = kcalloc_node(num_ports, sizeof(*xhci->rh_bw), flags,
2199 dev_to_node(dev));
2200 if (!xhci->rh_bw)
2201 return -ENOMEM;
2202 for (i = 0; i < num_ports; i++) {
2203 struct xhci_interval_bw_table *bw_table;
2204
2205 INIT_LIST_HEAD(&xhci->rh_bw[i].tts);
2206 bw_table = &xhci->rh_bw[i].bw_table;
2207 for (j = 0; j < XHCI_MAX_INTERVAL; j++)
2208 INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints);
2209 }
2210 base = &xhci->cap_regs->hc_capbase;
2211
2212 cap_start = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_PROTOCOL);
2213 if (!cap_start) {
2214 xhci_err(xhci, "No Extended Capability registers, unable to set up roothub\n");
2215 return -ENODEV;
2216 }
2217
2218 offset = cap_start;
2219 /* count extended protocol capability entries for later caching */
2220 while (offset) {
2221 cap_count++;
2222 offset = xhci_find_next_ext_cap(base, offset,
2223 XHCI_EXT_CAPS_PROTOCOL);
2224 }
2225
2226 xhci->ext_caps = kcalloc_node(cap_count, sizeof(*xhci->ext_caps),
2227 flags, dev_to_node(dev));
2228 if (!xhci->ext_caps)
2229 return -ENOMEM;
2230
2231 xhci->port_caps = kcalloc_node(cap_count, sizeof(*xhci->port_caps),
2232 flags, dev_to_node(dev));
2233 if (!xhci->port_caps)
2234 return -ENOMEM;
2235
2236 offset = cap_start;
2237
2238 while (offset) {
2239 xhci_add_in_port(xhci, num_ports, base + offset, cap_count);
2240 if (xhci->usb2_rhub.num_ports + xhci->usb3_rhub.num_ports ==
2241 num_ports)
2242 break;
2243 offset = xhci_find_next_ext_cap(base, offset,
2244 XHCI_EXT_CAPS_PROTOCOL);
2245 }
2246 if (xhci->usb2_rhub.num_ports == 0 && xhci->usb3_rhub.num_ports == 0) {
2247 xhci_warn(xhci, "No ports on the roothubs?\n");
2248 return -ENODEV;
2249 }
2250 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2251 "Found %u USB 2.0 ports and %u USB 3.0 ports.",
2252 xhci->usb2_rhub.num_ports, xhci->usb3_rhub.num_ports);
2253
2254 /* Place limits on the number of roothub ports so that the hub
2255 * descriptors aren't longer than the USB core will allocate.
2256 */
2257 if (xhci->usb3_rhub.num_ports > USB_SS_MAXPORTS) {
2258 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2259 "Limiting USB 3.0 roothub ports to %u.",
2260 USB_SS_MAXPORTS);
2261 xhci->usb3_rhub.num_ports = USB_SS_MAXPORTS;
2262 }
2263 if (xhci->usb2_rhub.num_ports > USB_MAXCHILDREN) {
2264 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2265 "Limiting USB 2.0 roothub ports to %u.",
2266 USB_MAXCHILDREN);
2267 xhci->usb2_rhub.num_ports = USB_MAXCHILDREN;
2268 }
2269
2270 if (!xhci->usb2_rhub.num_ports)
2271 xhci_info(xhci, "USB2 root hub has no ports\n");
2272
2273 if (!xhci->usb3_rhub.num_ports)
2274 xhci_info(xhci, "USB3 root hub has no ports\n");
2275
2276 xhci_create_rhub_port_array(xhci, &xhci->usb2_rhub, flags);
2277 xhci_create_rhub_port_array(xhci, &xhci->usb3_rhub, flags);
2278
2279 return 0;
2280}
2281
2282static struct xhci_interrupter *
2283xhci_alloc_interrupter(struct xhci_hcd *xhci, int segs, gfp_t flags)
2284{
2285 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
2286 struct xhci_interrupter *ir;
2287 unsigned int num_segs = segs;
2288 int ret;
2289
2290 ir = kzalloc_node(sizeof(*ir), flags, dev_to_node(dev));
2291 if (!ir)
2292 return NULL;
2293
2294 /* number of ring segments should be greater than 0 */
2295 if (segs <= 0)
2296 num_segs = min_t(unsigned int, 1 << HCS_ERST_MAX(xhci->hcs_params2),
2297 ERST_MAX_SEGS);
2298
2299 ir->event_ring = xhci_ring_alloc(xhci, num_segs, 1, TYPE_EVENT, 0,
2300 flags);
2301 if (!ir->event_ring) {
2302 xhci_warn(xhci, "Failed to allocate interrupter event ring\n");
2303 kfree(ir);
2304 return NULL;
2305 }
2306
2307 ret = xhci_alloc_erst(xhci, ir->event_ring, &ir->erst, flags);
2308 if (ret) {
2309 xhci_warn(xhci, "Failed to allocate interrupter erst\n");
2310 xhci_ring_free(xhci, ir->event_ring);
2311 kfree(ir);
2312 return NULL;
2313 }
2314
2315 return ir;
2316}
2317
2318static int
2319xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
2320 unsigned int intr_num)
2321{
2322 u64 erst_base;
2323 u32 erst_size;
2324
2325 if (intr_num >= xhci->max_interrupters) {
2326 xhci_warn(xhci, "Can't add interrupter %d, max interrupters %d\n",
2327 intr_num, xhci->max_interrupters);
2328 return -EINVAL;
2329 }
2330
2331 if (xhci->interrupters[intr_num]) {
2332 xhci_warn(xhci, "Interrupter %d\n already set up", intr_num);
2333 return -EINVAL;
2334 }
2335
2336 xhci->interrupters[intr_num] = ir;
2337 ir->intr_num = intr_num;
2338 ir->ir_set = &xhci->run_regs->ir_set[intr_num];
2339
2340 /* set ERST count with the number of entries in the segment table */
2341 erst_size = readl(&ir->ir_set->erst_size);
2342 erst_size &= ERST_SIZE_MASK;
2343 erst_size |= ir->event_ring->num_segs;
2344 writel(erst_size, &ir->ir_set->erst_size);
2345
2346 erst_base = xhci_read_64(xhci, &ir->ir_set->erst_base);
2347 erst_base &= ERST_BASE_RSVDP;
2348 erst_base |= ir->erst.erst_dma_addr & ~ERST_BASE_RSVDP;
2349 xhci_write_64(xhci, erst_base, &ir->ir_set->erst_base);
2350
2351 /* Set the event ring dequeue address of this interrupter */
2352 xhci_set_hc_event_deq(xhci, ir);
2353
2354 return 0;
2355}
2356
2357struct xhci_interrupter *
2358xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg)
2359{
2360 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2361 struct xhci_interrupter *ir;
2362 unsigned int i;
2363 int err = -ENOSPC;
2364
2365 if (!xhci->interrupters || xhci->max_interrupters <= 1)
2366 return NULL;
2367
2368 ir = xhci_alloc_interrupter(xhci, num_seg, GFP_KERNEL);
2369 if (!ir)
2370 return NULL;
2371
2372 spin_lock_irq(&xhci->lock);
2373
2374 /* Find available secondary interrupter, interrupter 0 is reserved for primary */
2375 for (i = 1; i < xhci->max_interrupters; i++) {
2376 if (xhci->interrupters[i] == NULL) {
2377 err = xhci_add_interrupter(xhci, ir, i);
2378 break;
2379 }
2380 }
2381
2382 spin_unlock_irq(&xhci->lock);
2383
2384 if (err) {
2385 xhci_warn(xhci, "Failed to add secondary interrupter, max interrupters %d\n",
2386 xhci->max_interrupters);
2387 xhci_free_interrupter(xhci, ir);
2388 return NULL;
2389 }
2390
2391 xhci_dbg(xhci, "Add secondary interrupter %d, max interrupters %d\n",
2392 i, xhci->max_interrupters);
2393
2394 return ir;
2395}
2396EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);
2397
2398int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
2399{
2400 struct xhci_interrupter *ir;
2401 struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
2402 dma_addr_t dma;
2403 unsigned int val, val2;
2404 u64 val_64;
2405 u32 page_size, temp;
2406 int i;
2407
2408 INIT_LIST_HEAD(&xhci->cmd_list);
2409
2410 /* init command timeout work */
2411 INIT_DELAYED_WORK(&xhci->cmd_timer, xhci_handle_command_timeout);
2412 init_completion(&xhci->cmd_ring_stop_completion);
2413
2414 page_size = readl(&xhci->op_regs->page_size);
2415 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2416 "Supported page size register = 0x%x", page_size);
2417 i = ffs(page_size);
2418 if (i < 16)
2419 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2420 "Supported page size of %iK", (1 << (i+12)) / 1024);
2421 else
2422 xhci_warn(xhci, "WARN: no supported page size\n");
2423 /* Use 4K pages, since that's common and the minimum the HC supports */
2424 xhci->page_shift = 12;
2425 xhci->page_size = 1 << xhci->page_shift;
2426 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2427 "HCD page size set to %iK", xhci->page_size / 1024);
2428
2429 /*
2430 * Program the Number of Device Slots Enabled field in the CONFIG
2431 * register with the max value of slots the HC can handle.
2432 */
2433 val = HCS_MAX_SLOTS(readl(&xhci->cap_regs->hcs_params1));
2434 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2435 "// xHC can handle at most %d device slots.", val);
2436 val2 = readl(&xhci->op_regs->config_reg);
2437 val |= (val2 & ~HCS_SLOTS_MASK);
2438 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2439 "// Setting Max device slots reg = 0x%x.", val);
2440 writel(val, &xhci->op_regs->config_reg);
2441
2442 /*
2443 * xHCI section 5.4.6 - Device Context array must be
2444 * "physically contiguous and 64-byte (cache line) aligned".
2445 */
2446 xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), &dma,
2447 flags);
2448 if (!xhci->dcbaa)
2449 goto fail;
2450 xhci->dcbaa->dma = dma;
2451 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2452 "// Device context base array address = 0x%pad (DMA), %p (virt)",
2453 &xhci->dcbaa->dma, xhci->dcbaa);
2454 xhci_write_64(xhci, dma, &xhci->op_regs->dcbaa_ptr);
2455
2456 /*
2457 * Initialize the ring segment pool. The ring must be a contiguous
2458 * structure comprised of TRBs. The TRBs must be 16 byte aligned,
2459 * however, the command ring segment needs 64-byte aligned segments
2460 * and our use of dma addresses in the trb_address_map radix tree needs
2461 * TRB_SEGMENT_SIZE alignment, so we pick the greater alignment need.
2462 */
2463 if (xhci->quirks & XHCI_ZHAOXIN_TRB_FETCH)
2464 xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
2465 TRB_SEGMENT_SIZE * 2, TRB_SEGMENT_SIZE * 2, xhci->page_size * 2);
2466 else
2467 xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
2468 TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size);
2469
2470 /* See Table 46 and Note on Figure 55 */
2471 xhci->device_pool = dma_pool_create("xHCI input/output contexts", dev,
2472 2112, 64, xhci->page_size);
2473 if (!xhci->segment_pool || !xhci->device_pool)
2474 goto fail;
2475
2476 /* Linear stream context arrays don't have any boundary restrictions,
2477 * and only need to be 16-byte aligned.
2478 */
2479 xhci->small_streams_pool =
2480 dma_pool_create("xHCI 256 byte stream ctx arrays",
2481 dev, SMALL_STREAM_ARRAY_SIZE, 16, 0);
2482 xhci->medium_streams_pool =
2483 dma_pool_create("xHCI 1KB stream ctx arrays",
2484 dev, MEDIUM_STREAM_ARRAY_SIZE, 16, 0);
2485 /* Any stream context array bigger than MEDIUM_STREAM_ARRAY_SIZE
2486 * will be allocated with dma_alloc_coherent()
2487 */
2488
2489 if (!xhci->small_streams_pool || !xhci->medium_streams_pool)
2490 goto fail;
2491
2492 /* Set up the command ring to have one segments for now. */
2493 xhci->cmd_ring = xhci_ring_alloc(xhci, 1, 1, TYPE_COMMAND, 0, flags);
2494 if (!xhci->cmd_ring)
2495 goto fail;
2496 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2497 "Allocated command ring at %p", xhci->cmd_ring);
2498 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "First segment DMA is 0x%pad",
2499 &xhci->cmd_ring->first_seg->dma);
2500
2501 /* Set the address in the Command Ring Control register */
2502 val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
2503 val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
2504 (xhci->cmd_ring->first_seg->dma & (u64) ~CMD_RING_RSVD_BITS) |
2505 xhci->cmd_ring->cycle_state;
2506 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2507 "// Setting command ring address to 0x%016llx", val_64);
2508 xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
2509
2510 /* Reserve one command ring TRB for disabling LPM.
2511 * Since the USB core grabs the shared usb_bus bandwidth mutex before
2512 * disabling LPM, we only need to reserve one TRB for all devices.
2513 */
2514 xhci->cmd_ring_reserved_trbs++;
2515
2516 val = readl(&xhci->cap_regs->db_off);
2517 val &= DBOFF_MASK;
2518 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2519 "// Doorbell array is located at offset 0x%x from cap regs base addr",
2520 val);
2521 xhci->dba = (void __iomem *) xhci->cap_regs + val;
2522
2523 /* Allocate and set up primary interrupter 0 with an event ring. */
2524 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2525 "Allocating primary event ring");
2526 xhci->interrupters = kcalloc_node(xhci->max_interrupters, sizeof(*xhci->interrupters),
2527 flags, dev_to_node(dev));
2528
2529 ir = xhci_alloc_interrupter(xhci, 0, flags);
2530 if (!ir)
2531 goto fail;
2532
2533 if (xhci_add_interrupter(xhci, ir, 0))
2534 goto fail;
2535
2536 xhci->isoc_bei_interval = AVOID_BEI_INTERVAL_MAX;
2537
2538 /*
2539 * XXX: Might need to set the Interrupter Moderation Register to
2540 * something other than the default (~1ms minimum between interrupts).
2541 * See section 5.5.1.2.
2542 */
2543 for (i = 0; i < MAX_HC_SLOTS; i++)
2544 xhci->devs[i] = NULL;
2545
2546 if (scratchpad_alloc(xhci, flags))
2547 goto fail;
2548 if (xhci_setup_port_arrays(xhci, flags))
2549 goto fail;
2550
2551 /* Enable USB 3.0 device notifications for function remote wake, which
2552 * is necessary for allowing USB 3.0 devices to do remote wakeup from
2553 * U3 (device suspend).
2554 */
2555 temp = readl(&xhci->op_regs->dev_notification);
2556 temp &= ~DEV_NOTE_MASK;
2557 temp |= DEV_NOTE_FWAKE;
2558 writel(temp, &xhci->op_regs->dev_notification);
2559
2560 return 0;
2561
2562fail:
2563 xhci_halt(xhci);
2564 xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
2565 xhci_mem_cleanup(xhci);
2566 return -ENOMEM;
2567}
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#include <linux/usb.h>
24#include <linux/pci.h>
25#include <linux/slab.h>
26#include <linux/dmapool.h>
27#include <linux/dma-mapping.h>
28
29#include "xhci.h"
30#include "xhci-trace.h"
31
32/*
33 * Allocates a generic ring segment from the ring pool, sets the dma address,
34 * initializes the segment to zero, and sets the private next pointer to NULL.
35 *
36 * Section 4.11.1.1:
37 * "All components of all Command and Transfer TRBs shall be initialized to '0'"
38 */
39static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci,
40 unsigned int cycle_state, gfp_t flags)
41{
42 struct xhci_segment *seg;
43 dma_addr_t dma;
44 int i;
45
46 seg = kzalloc(sizeof *seg, flags);
47 if (!seg)
48 return NULL;
49
50 seg->trbs = dma_pool_zalloc(xhci->segment_pool, flags, &dma);
51 if (!seg->trbs) {
52 kfree(seg);
53 return NULL;
54 }
55
56 /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */
57 if (cycle_state == 0) {
58 for (i = 0; i < TRBS_PER_SEGMENT; i++)
59 seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE);
60 }
61 seg->dma = dma;
62 seg->next = NULL;
63
64 return seg;
65}
66
67static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
68{
69 if (seg->trbs) {
70 dma_pool_free(xhci->segment_pool, seg->trbs, seg->dma);
71 seg->trbs = NULL;
72 }
73 kfree(seg);
74}
75
76static void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
77 struct xhci_segment *first)
78{
79 struct xhci_segment *seg;
80
81 seg = first->next;
82 while (seg != first) {
83 struct xhci_segment *next = seg->next;
84 xhci_segment_free(xhci, seg);
85 seg = next;
86 }
87 xhci_segment_free(xhci, first);
88}
89
90/*
91 * Make the prev segment point to the next segment.
92 *
93 * Change the last TRB in the prev segment to be a Link TRB which points to the
94 * DMA address of the next segment. The caller needs to set any Link TRB
95 * related flags, such as End TRB, Toggle Cycle, and no snoop.
96 */
97static void xhci_link_segments(struct xhci_hcd *xhci, struct xhci_segment *prev,
98 struct xhci_segment *next, enum xhci_ring_type type)
99{
100 u32 val;
101
102 if (!prev || !next)
103 return;
104 prev->next = next;
105 if (type != TYPE_EVENT) {
106 prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr =
107 cpu_to_le64(next->dma);
108
109 /* Set the last TRB in the segment to have a TRB type ID of Link TRB */
110 val = le32_to_cpu(prev->trbs[TRBS_PER_SEGMENT-1].link.control);
111 val &= ~TRB_TYPE_BITMASK;
112 val |= TRB_TYPE(TRB_LINK);
113 /* Always set the chain bit with 0.95 hardware */
114 /* Set chain bit for isoc rings on AMD 0.96 host */
115 if (xhci_link_trb_quirk(xhci) ||
116 (type == TYPE_ISOC &&
117 (xhci->quirks & XHCI_AMD_0x96_HOST)))
118 val |= TRB_CHAIN;
119 prev->trbs[TRBS_PER_SEGMENT-1].link.control = cpu_to_le32(val);
120 }
121}
122
123/*
124 * Link the ring to the new segments.
125 * Set Toggle Cycle for the new ring if needed.
126 */
127static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring,
128 struct xhci_segment *first, struct xhci_segment *last,
129 unsigned int num_segs)
130{
131 struct xhci_segment *next;
132
133 if (!ring || !first || !last)
134 return;
135
136 next = ring->enq_seg->next;
137 xhci_link_segments(xhci, ring->enq_seg, first, ring->type);
138 xhci_link_segments(xhci, last, next, ring->type);
139 ring->num_segs += num_segs;
140 ring->num_trbs_free += (TRBS_PER_SEGMENT - 1) * num_segs;
141
142 if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) {
143 ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control
144 &= ~cpu_to_le32(LINK_TOGGLE);
145 last->trbs[TRBS_PER_SEGMENT-1].link.control
146 |= cpu_to_le32(LINK_TOGGLE);
147 ring->last_seg = last;
148 }
149}
150
151/*
152 * We need a radix tree for mapping physical addresses of TRBs to which stream
153 * ID they belong to. We need to do this because the host controller won't tell
154 * us which stream ring the TRB came from. We could store the stream ID in an
155 * event data TRB, but that doesn't help us for the cancellation case, since the
156 * endpoint may stop before it reaches that event data TRB.
157 *
158 * The radix tree maps the upper portion of the TRB DMA address to a ring
159 * segment that has the same upper portion of DMA addresses. For example, say I
160 * have segments of size 1KB, that are always 1KB aligned. A segment may
161 * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the
162 * key to the stream ID is 0x43244. I can use the DMA address of the TRB to
163 * pass the radix tree a key to get the right stream ID:
164 *
165 * 0x10c90fff >> 10 = 0x43243
166 * 0x10c912c0 >> 10 = 0x43244
167 * 0x10c91400 >> 10 = 0x43245
168 *
169 * Obviously, only those TRBs with DMA addresses that are within the segment
170 * will make the radix tree return the stream ID for that ring.
171 *
172 * Caveats for the radix tree:
173 *
174 * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an
175 * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be
176 * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the
177 * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit
178 * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit
179 * extended systems (where the DMA address can be bigger than 32-bits),
180 * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
181 */
182static int xhci_insert_segment_mapping(struct radix_tree_root *trb_address_map,
183 struct xhci_ring *ring,
184 struct xhci_segment *seg,
185 gfp_t mem_flags)
186{
187 unsigned long key;
188 int ret;
189
190 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
191 /* Skip any segments that were already added. */
192 if (radix_tree_lookup(trb_address_map, key))
193 return 0;
194
195 ret = radix_tree_maybe_preload(mem_flags);
196 if (ret)
197 return ret;
198 ret = radix_tree_insert(trb_address_map,
199 key, ring);
200 radix_tree_preload_end();
201 return ret;
202}
203
204static void xhci_remove_segment_mapping(struct radix_tree_root *trb_address_map,
205 struct xhci_segment *seg)
206{
207 unsigned long key;
208
209 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT);
210 if (radix_tree_lookup(trb_address_map, key))
211 radix_tree_delete(trb_address_map, key);
212}
213
214static int xhci_update_stream_segment_mapping(
215 struct radix_tree_root *trb_address_map,
216 struct xhci_ring *ring,
217 struct xhci_segment *first_seg,
218 struct xhci_segment *last_seg,
219 gfp_t mem_flags)
220{
221 struct xhci_segment *seg;
222 struct xhci_segment *failed_seg;
223 int ret;
224
225 if (WARN_ON_ONCE(trb_address_map == NULL))
226 return 0;
227
228 seg = first_seg;
229 do {
230 ret = xhci_insert_segment_mapping(trb_address_map,
231 ring, seg, mem_flags);
232 if (ret)
233 goto remove_streams;
234 if (seg == last_seg)
235 return 0;
236 seg = seg->next;
237 } while (seg != first_seg);
238
239 return 0;
240
241remove_streams:
242 failed_seg = seg;
243 seg = first_seg;
244 do {
245 xhci_remove_segment_mapping(trb_address_map, seg);
246 if (seg == failed_seg)
247 return ret;
248 seg = seg->next;
249 } while (seg != first_seg);
250
251 return ret;
252}
253
254static void xhci_remove_stream_mapping(struct xhci_ring *ring)
255{
256 struct xhci_segment *seg;
257
258 if (WARN_ON_ONCE(ring->trb_address_map == NULL))
259 return;
260
261 seg = ring->first_seg;
262 do {
263 xhci_remove_segment_mapping(ring->trb_address_map, seg);
264 seg = seg->next;
265 } while (seg != ring->first_seg);
266}
267
268static int xhci_update_stream_mapping(struct xhci_ring *ring, gfp_t mem_flags)
269{
270 return xhci_update_stream_segment_mapping(ring->trb_address_map, ring,
271 ring->first_seg, ring->last_seg, mem_flags);
272}
273
274/* XXX: Do we need the hcd structure in all these functions? */
275void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
276{
277 if (!ring)
278 return;
279
280 if (ring->first_seg) {
281 if (ring->type == TYPE_STREAM)
282 xhci_remove_stream_mapping(ring);
283 xhci_free_segments_for_ring(xhci, ring->first_seg);
284 }
285
286 kfree(ring);
287}
288
289static void xhci_initialize_ring_info(struct xhci_ring *ring,
290 unsigned int cycle_state)
291{
292 /* The ring is empty, so the enqueue pointer == dequeue pointer */
293 ring->enqueue = ring->first_seg->trbs;
294 ring->enq_seg = ring->first_seg;
295 ring->dequeue = ring->enqueue;
296 ring->deq_seg = ring->first_seg;
297 /* The ring is initialized to 0. The producer must write 1 to the cycle
298 * bit to handover ownership of the TRB, so PCS = 1. The consumer must
299 * compare CCS to the cycle bit to check ownership, so CCS = 1.
300 *
301 * New rings are initialized with cycle state equal to 1; if we are
302 * handling ring expansion, set the cycle state equal to the old ring.
303 */
304 ring->cycle_state = cycle_state;
305 /* Not necessary for new rings, but needed for re-initialized rings */
306 ring->enq_updates = 0;
307 ring->deq_updates = 0;
308
309 /*
310 * Each segment has a link TRB, and leave an extra TRB for SW
311 * accounting purpose
312 */
313 ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
314}
315
316/* Allocate segments and link them for a ring */
317static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,
318 struct xhci_segment **first, struct xhci_segment **last,
319 unsigned int num_segs, unsigned int cycle_state,
320 enum xhci_ring_type type, gfp_t flags)
321{
322 struct xhci_segment *prev;
323
324 prev = xhci_segment_alloc(xhci, cycle_state, flags);
325 if (!prev)
326 return -ENOMEM;
327 num_segs--;
328
329 *first = prev;
330 while (num_segs > 0) {
331 struct xhci_segment *next;
332
333 next = xhci_segment_alloc(xhci, cycle_state, flags);
334 if (!next) {
335 prev = *first;
336 while (prev) {
337 next = prev->next;
338 xhci_segment_free(xhci, prev);
339 prev = next;
340 }
341 return -ENOMEM;
342 }
343 xhci_link_segments(xhci, prev, next, type);
344
345 prev = next;
346 num_segs--;
347 }
348 xhci_link_segments(xhci, prev, *first, type);
349 *last = prev;
350
351 return 0;
352}
353
354/**
355 * Create a new ring with zero or more segments.
356 *
357 * Link each segment together into a ring.
358 * Set the end flag and the cycle toggle bit on the last segment.
359 * See section 4.9.1 and figures 15 and 16.
360 */
361static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
362 unsigned int num_segs, unsigned int cycle_state,
363 enum xhci_ring_type type, gfp_t flags)
364{
365 struct xhci_ring *ring;
366 int ret;
367
368 ring = kzalloc(sizeof *(ring), flags);
369 if (!ring)
370 return NULL;
371
372 ring->num_segs = num_segs;
373 INIT_LIST_HEAD(&ring->td_list);
374 ring->type = type;
375 if (num_segs == 0)
376 return ring;
377
378 ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg,
379 &ring->last_seg, num_segs, cycle_state, type, flags);
380 if (ret)
381 goto fail;
382
383 /* Only event ring does not use link TRB */
384 if (type != TYPE_EVENT) {
385 /* See section 4.9.2.1 and 6.4.4.1 */
386 ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
387 cpu_to_le32(LINK_TOGGLE);
388 }
389 xhci_initialize_ring_info(ring, cycle_state);
390 return ring;
391
392fail:
393 kfree(ring);
394 return NULL;
395}
396
397void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
398 struct xhci_virt_device *virt_dev,
399 unsigned int ep_index)
400{
401 int rings_cached;
402
403 rings_cached = virt_dev->num_rings_cached;
404 if (rings_cached < XHCI_MAX_RINGS_CACHED) {
405 virt_dev->ring_cache[rings_cached] =
406 virt_dev->eps[ep_index].ring;
407 virt_dev->num_rings_cached++;
408 xhci_dbg(xhci, "Cached old ring, "
409 "%d ring%s cached\n",
410 virt_dev->num_rings_cached,
411 (virt_dev->num_rings_cached > 1) ? "s" : "");
412 } else {
413 xhci_ring_free(xhci, virt_dev->eps[ep_index].ring);
414 xhci_dbg(xhci, "Ring cache full (%d rings), "
415 "freeing ring\n",
416 virt_dev->num_rings_cached);
417 }
418 virt_dev->eps[ep_index].ring = NULL;
419}
420
421/* Zero an endpoint ring (except for link TRBs) and move the enqueue and dequeue
422 * pointers to the beginning of the ring.
423 */
424static void xhci_reinit_cached_ring(struct xhci_hcd *xhci,
425 struct xhci_ring *ring, unsigned int cycle_state,
426 enum xhci_ring_type type)
427{
428 struct xhci_segment *seg = ring->first_seg;
429 int i;
430
431 do {
432 memset(seg->trbs, 0,
433 sizeof(union xhci_trb)*TRBS_PER_SEGMENT);
434 if (cycle_state == 0) {
435 for (i = 0; i < TRBS_PER_SEGMENT; i++)
436 seg->trbs[i].link.control |=
437 cpu_to_le32(TRB_CYCLE);
438 }
439 /* All endpoint rings have link TRBs */
440 xhci_link_segments(xhci, seg, seg->next, type);
441 seg = seg->next;
442 } while (seg != ring->first_seg);
443 ring->type = type;
444 xhci_initialize_ring_info(ring, cycle_state);
445 /* td list should be empty since all URBs have been cancelled,
446 * but just in case...
447 */
448 INIT_LIST_HEAD(&ring->td_list);
449}
450
451/*
452 * Expand an existing ring.
453 * Look for a cached ring or allocate a new ring which has same segment numbers
454 * and link the two rings.
455 */
456int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
457 unsigned int num_trbs, gfp_t flags)
458{
459 struct xhci_segment *first;
460 struct xhci_segment *last;
461 unsigned int num_segs;
462 unsigned int num_segs_needed;
463 int ret;
464
465 num_segs_needed = (num_trbs + (TRBS_PER_SEGMENT - 1) - 1) /
466 (TRBS_PER_SEGMENT - 1);
467
468 /* Allocate number of segments we needed, or double the ring size */
469 num_segs = ring->num_segs > num_segs_needed ?
470 ring->num_segs : num_segs_needed;
471
472 ret = xhci_alloc_segments_for_ring(xhci, &first, &last,
473 num_segs, ring->cycle_state, ring->type, flags);
474 if (ret)
475 return -ENOMEM;
476
477 if (ring->type == TYPE_STREAM)
478 ret = xhci_update_stream_segment_mapping(ring->trb_address_map,
479 ring, first, last, flags);
480 if (ret) {
481 struct xhci_segment *next;
482 do {
483 next = first->next;
484 xhci_segment_free(xhci, first);
485 if (first == last)
486 break;
487 first = next;
488 } while (true);
489 return ret;
490 }
491
492 xhci_link_rings(xhci, ring, first, last, num_segs);
493 xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion,
494 "ring expansion succeed, now has %d segments",
495 ring->num_segs);
496
497 return 0;
498}
499
500#define CTX_SIZE(_hcc) (HCC_64BYTE_CONTEXT(_hcc) ? 64 : 32)
501
502static struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci,
503 int type, gfp_t flags)
504{
505 struct xhci_container_ctx *ctx;
506
507 if ((type != XHCI_CTX_TYPE_DEVICE) && (type != XHCI_CTX_TYPE_INPUT))
508 return NULL;
509
510 ctx = kzalloc(sizeof(*ctx), flags);
511 if (!ctx)
512 return NULL;
513
514 ctx->type = type;
515 ctx->size = HCC_64BYTE_CONTEXT(xhci->hcc_params) ? 2048 : 1024;
516 if (type == XHCI_CTX_TYPE_INPUT)
517 ctx->size += CTX_SIZE(xhci->hcc_params);
518
519 ctx->bytes = dma_pool_zalloc(xhci->device_pool, flags, &ctx->dma);
520 if (!ctx->bytes) {
521 kfree(ctx);
522 return NULL;
523 }
524 return ctx;
525}
526
527static void xhci_free_container_ctx(struct xhci_hcd *xhci,
528 struct xhci_container_ctx *ctx)
529{
530 if (!ctx)
531 return;
532 dma_pool_free(xhci->device_pool, ctx->bytes, ctx->dma);
533 kfree(ctx);
534}
535
536struct xhci_input_control_ctx *xhci_get_input_control_ctx(
537 struct xhci_container_ctx *ctx)
538{
539 if (ctx->type != XHCI_CTX_TYPE_INPUT)
540 return NULL;
541
542 return (struct xhci_input_control_ctx *)ctx->bytes;
543}
544
545struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci,
546 struct xhci_container_ctx *ctx)
547{
548 if (ctx->type == XHCI_CTX_TYPE_DEVICE)
549 return (struct xhci_slot_ctx *)ctx->bytes;
550
551 return (struct xhci_slot_ctx *)
552 (ctx->bytes + CTX_SIZE(xhci->hcc_params));
553}
554
555struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci,
556 struct xhci_container_ctx *ctx,
557 unsigned int ep_index)
558{
559 /* increment ep index by offset of start of ep ctx array */
560 ep_index++;
561 if (ctx->type == XHCI_CTX_TYPE_INPUT)
562 ep_index++;
563
564 return (struct xhci_ep_ctx *)
565 (ctx->bytes + (ep_index * CTX_SIZE(xhci->hcc_params)));
566}
567
568
569/***************** Streams structures manipulation *************************/
570
571static void xhci_free_stream_ctx(struct xhci_hcd *xhci,
572 unsigned int num_stream_ctxs,
573 struct xhci_stream_ctx *stream_ctx, dma_addr_t dma)
574{
575 struct device *dev = xhci_to_hcd(xhci)->self.controller;
576 size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
577
578 if (size > MEDIUM_STREAM_ARRAY_SIZE)
579 dma_free_coherent(dev, size,
580 stream_ctx, dma);
581 else if (size <= SMALL_STREAM_ARRAY_SIZE)
582 return dma_pool_free(xhci->small_streams_pool,
583 stream_ctx, dma);
584 else
585 return dma_pool_free(xhci->medium_streams_pool,
586 stream_ctx, dma);
587}
588
589/*
590 * The stream context array for each endpoint with bulk streams enabled can
591 * vary in size, based on:
592 * - how many streams the endpoint supports,
593 * - the maximum primary stream array size the host controller supports,
594 * - and how many streams the device driver asks for.
595 *
596 * The stream context array must be a power of 2, and can be as small as
597 * 64 bytes or as large as 1MB.
598 */
599static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
600 unsigned int num_stream_ctxs, dma_addr_t *dma,
601 gfp_t mem_flags)
602{
603 struct device *dev = xhci_to_hcd(xhci)->self.controller;
604 size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
605
606 if (size > MEDIUM_STREAM_ARRAY_SIZE)
607 return dma_alloc_coherent(dev, size,
608 dma, mem_flags);
609 else if (size <= SMALL_STREAM_ARRAY_SIZE)
610 return dma_pool_alloc(xhci->small_streams_pool,
611 mem_flags, dma);
612 else
613 return dma_pool_alloc(xhci->medium_streams_pool,
614 mem_flags, dma);
615}
616
617struct xhci_ring *xhci_dma_to_transfer_ring(
618 struct xhci_virt_ep *ep,
619 u64 address)
620{
621 if (ep->ep_state & EP_HAS_STREAMS)
622 return radix_tree_lookup(&ep->stream_info->trb_address_map,
623 address >> TRB_SEGMENT_SHIFT);
624 return ep->ring;
625}
626
627struct xhci_ring *xhci_stream_id_to_ring(
628 struct xhci_virt_device *dev,
629 unsigned int ep_index,
630 unsigned int stream_id)
631{
632 struct xhci_virt_ep *ep = &dev->eps[ep_index];
633
634 if (stream_id == 0)
635 return ep->ring;
636 if (!ep->stream_info)
637 return NULL;
638
639 if (stream_id > ep->stream_info->num_streams)
640 return NULL;
641 return ep->stream_info->stream_rings[stream_id];
642}
643
644/*
645 * Change an endpoint's internal structure so it supports stream IDs. The
646 * number of requested streams includes stream 0, which cannot be used by device
647 * drivers.
648 *
649 * The number of stream contexts in the stream context array may be bigger than
650 * the number of streams the driver wants to use. This is because the number of
651 * stream context array entries must be a power of two.
652 */
653struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
654 unsigned int num_stream_ctxs,
655 unsigned int num_streams, gfp_t mem_flags)
656{
657 struct xhci_stream_info *stream_info;
658 u32 cur_stream;
659 struct xhci_ring *cur_ring;
660 u64 addr;
661 int ret;
662
663 xhci_dbg(xhci, "Allocating %u streams and %u "
664 "stream context array entries.\n",
665 num_streams, num_stream_ctxs);
666 if (xhci->cmd_ring_reserved_trbs == MAX_RSVD_CMD_TRBS) {
667 xhci_dbg(xhci, "Command ring has no reserved TRBs available\n");
668 return NULL;
669 }
670 xhci->cmd_ring_reserved_trbs++;
671
672 stream_info = kzalloc(sizeof(struct xhci_stream_info), mem_flags);
673 if (!stream_info)
674 goto cleanup_trbs;
675
676 stream_info->num_streams = num_streams;
677 stream_info->num_stream_ctxs = num_stream_ctxs;
678
679 /* Initialize the array of virtual pointers to stream rings. */
680 stream_info->stream_rings = kzalloc(
681 sizeof(struct xhci_ring *)*num_streams,
682 mem_flags);
683 if (!stream_info->stream_rings)
684 goto cleanup_info;
685
686 /* Initialize the array of DMA addresses for stream rings for the HW. */
687 stream_info->stream_ctx_array = xhci_alloc_stream_ctx(xhci,
688 num_stream_ctxs, &stream_info->ctx_array_dma,
689 mem_flags);
690 if (!stream_info->stream_ctx_array)
691 goto cleanup_ctx;
692 memset(stream_info->stream_ctx_array, 0,
693 sizeof(struct xhci_stream_ctx)*num_stream_ctxs);
694
695 /* Allocate everything needed to free the stream rings later */
696 stream_info->free_streams_command =
697 xhci_alloc_command(xhci, true, true, mem_flags);
698 if (!stream_info->free_streams_command)
699 goto cleanup_ctx;
700
701 INIT_RADIX_TREE(&stream_info->trb_address_map, GFP_ATOMIC);
702
703 /* Allocate rings for all the streams that the driver will use,
704 * and add their segment DMA addresses to the radix tree.
705 * Stream 0 is reserved.
706 */
707 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
708 stream_info->stream_rings[cur_stream] =
709 xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, mem_flags);
710 cur_ring = stream_info->stream_rings[cur_stream];
711 if (!cur_ring)
712 goto cleanup_rings;
713 cur_ring->stream_id = cur_stream;
714 cur_ring->trb_address_map = &stream_info->trb_address_map;
715 /* Set deq ptr, cycle bit, and stream context type */
716 addr = cur_ring->first_seg->dma |
717 SCT_FOR_CTX(SCT_PRI_TR) |
718 cur_ring->cycle_state;
719 stream_info->stream_ctx_array[cur_stream].stream_ring =
720 cpu_to_le64(addr);
721 xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n",
722 cur_stream, (unsigned long long) addr);
723
724 ret = xhci_update_stream_mapping(cur_ring, mem_flags);
725 if (ret) {
726 xhci_ring_free(xhci, cur_ring);
727 stream_info->stream_rings[cur_stream] = NULL;
728 goto cleanup_rings;
729 }
730 }
731 /* Leave the other unused stream ring pointers in the stream context
732 * array initialized to zero. This will cause the xHC to give us an
733 * error if the device asks for a stream ID we don't have setup (if it
734 * was any other way, the host controller would assume the ring is
735 * "empty" and wait forever for data to be queued to that stream ID).
736 */
737
738 return stream_info;
739
740cleanup_rings:
741 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
742 cur_ring = stream_info->stream_rings[cur_stream];
743 if (cur_ring) {
744 xhci_ring_free(xhci, cur_ring);
745 stream_info->stream_rings[cur_stream] = NULL;
746 }
747 }
748 xhci_free_command(xhci, stream_info->free_streams_command);
749cleanup_ctx:
750 kfree(stream_info->stream_rings);
751cleanup_info:
752 kfree(stream_info);
753cleanup_trbs:
754 xhci->cmd_ring_reserved_trbs--;
755 return NULL;
756}
757/*
758 * Sets the MaxPStreams field and the Linear Stream Array field.
759 * Sets the dequeue pointer to the stream context array.
760 */
761void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
762 struct xhci_ep_ctx *ep_ctx,
763 struct xhci_stream_info *stream_info)
764{
765 u32 max_primary_streams;
766 /* MaxPStreams is the number of stream context array entries, not the
767 * number we're actually using. Must be in 2^(MaxPstreams + 1) format.
768 * fls(0) = 0, fls(0x1) = 1, fls(0x10) = 2, fls(0x100) = 3, etc.
769 */
770 max_primary_streams = fls(stream_info->num_stream_ctxs) - 2;
771 xhci_dbg_trace(xhci, trace_xhci_dbg_context_change,
772 "Setting number of stream ctx array entries to %u",
773 1 << (max_primary_streams + 1));
774 ep_ctx->ep_info &= cpu_to_le32(~EP_MAXPSTREAMS_MASK);
775 ep_ctx->ep_info |= cpu_to_le32(EP_MAXPSTREAMS(max_primary_streams)
776 | EP_HAS_LSA);
777 ep_ctx->deq = cpu_to_le64(stream_info->ctx_array_dma);
778}
779
780/*
781 * Sets the MaxPStreams field and the Linear Stream Array field to 0.
782 * Reinstalls the "normal" endpoint ring (at its previous dequeue mark,
783 * not at the beginning of the ring).
784 */
785void xhci_setup_no_streams_ep_input_ctx(struct xhci_ep_ctx *ep_ctx,
786 struct xhci_virt_ep *ep)
787{
788 dma_addr_t addr;
789 ep_ctx->ep_info &= cpu_to_le32(~(EP_MAXPSTREAMS_MASK | EP_HAS_LSA));
790 addr = xhci_trb_virt_to_dma(ep->ring->deq_seg, ep->ring->dequeue);
791 ep_ctx->deq = cpu_to_le64(addr | ep->ring->cycle_state);
792}
793
794/* Frees all stream contexts associated with the endpoint,
795 *
796 * Caller should fix the endpoint context streams fields.
797 */
798void xhci_free_stream_info(struct xhci_hcd *xhci,
799 struct xhci_stream_info *stream_info)
800{
801 int cur_stream;
802 struct xhci_ring *cur_ring;
803
804 if (!stream_info)
805 return;
806
807 for (cur_stream = 1; cur_stream < stream_info->num_streams;
808 cur_stream++) {
809 cur_ring = stream_info->stream_rings[cur_stream];
810 if (cur_ring) {
811 xhci_ring_free(xhci, cur_ring);
812 stream_info->stream_rings[cur_stream] = NULL;
813 }
814 }
815 xhci_free_command(xhci, stream_info->free_streams_command);
816 xhci->cmd_ring_reserved_trbs--;
817 if (stream_info->stream_ctx_array)
818 xhci_free_stream_ctx(xhci,
819 stream_info->num_stream_ctxs,
820 stream_info->stream_ctx_array,
821 stream_info->ctx_array_dma);
822
823 kfree(stream_info->stream_rings);
824 kfree(stream_info);
825}
826
827
828/***************** Device context manipulation *************************/
829
830static void xhci_init_endpoint_timer(struct xhci_hcd *xhci,
831 struct xhci_virt_ep *ep)
832{
833 setup_timer(&ep->stop_cmd_timer, xhci_stop_endpoint_command_watchdog,
834 (unsigned long)ep);
835 ep->xhci = xhci;
836}
837
838static void xhci_free_tt_info(struct xhci_hcd *xhci,
839 struct xhci_virt_device *virt_dev,
840 int slot_id)
841{
842 struct list_head *tt_list_head;
843 struct xhci_tt_bw_info *tt_info, *next;
844 bool slot_found = false;
845
846 /* If the device never made it past the Set Address stage,
847 * it may not have the real_port set correctly.
848 */
849 if (virt_dev->real_port == 0 ||
850 virt_dev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) {
851 xhci_dbg(xhci, "Bad real port.\n");
852 return;
853 }
854
855 tt_list_head = &(xhci->rh_bw[virt_dev->real_port - 1].tts);
856 list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) {
857 /* Multi-TT hubs will have more than one entry */
858 if (tt_info->slot_id == slot_id) {
859 slot_found = true;
860 list_del(&tt_info->tt_list);
861 kfree(tt_info);
862 } else if (slot_found) {
863 break;
864 }
865 }
866}
867
868int xhci_alloc_tt_info(struct xhci_hcd *xhci,
869 struct xhci_virt_device *virt_dev,
870 struct usb_device *hdev,
871 struct usb_tt *tt, gfp_t mem_flags)
872{
873 struct xhci_tt_bw_info *tt_info;
874 unsigned int num_ports;
875 int i, j;
876
877 if (!tt->multi)
878 num_ports = 1;
879 else
880 num_ports = hdev->maxchild;
881
882 for (i = 0; i < num_ports; i++, tt_info++) {
883 struct xhci_interval_bw_table *bw_table;
884
885 tt_info = kzalloc(sizeof(*tt_info), mem_flags);
886 if (!tt_info)
887 goto free_tts;
888 INIT_LIST_HEAD(&tt_info->tt_list);
889 list_add(&tt_info->tt_list,
890 &xhci->rh_bw[virt_dev->real_port - 1].tts);
891 tt_info->slot_id = virt_dev->udev->slot_id;
892 if (tt->multi)
893 tt_info->ttport = i+1;
894 bw_table = &tt_info->bw_table;
895 for (j = 0; j < XHCI_MAX_INTERVAL; j++)
896 INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints);
897 }
898 return 0;
899
900free_tts:
901 xhci_free_tt_info(xhci, virt_dev, virt_dev->udev->slot_id);
902 return -ENOMEM;
903}
904
905
906/* All the xhci_tds in the ring's TD list should be freed at this point.
907 * Should be called with xhci->lock held if there is any chance the TT lists
908 * will be manipulated by the configure endpoint, allocate device, or update
909 * hub functions while this function is removing the TT entries from the list.
910 */
911void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
912{
913 struct xhci_virt_device *dev;
914 int i;
915 int old_active_eps = 0;
916
917 /* Slot ID 0 is reserved */
918 if (slot_id == 0 || !xhci->devs[slot_id])
919 return;
920
921 dev = xhci->devs[slot_id];
922 xhci->dcbaa->dev_context_ptrs[slot_id] = 0;
923 if (!dev)
924 return;
925
926 if (dev->tt_info)
927 old_active_eps = dev->tt_info->active_eps;
928
929 for (i = 0; i < 31; ++i) {
930 if (dev->eps[i].ring)
931 xhci_ring_free(xhci, dev->eps[i].ring);
932 if (dev->eps[i].stream_info)
933 xhci_free_stream_info(xhci,
934 dev->eps[i].stream_info);
935 /* Endpoints on the TT/root port lists should have been removed
936 * when usb_disable_device() was called for the device.
937 * We can't drop them anyway, because the udev might have gone
938 * away by this point, and we can't tell what speed it was.
939 */
940 if (!list_empty(&dev->eps[i].bw_endpoint_list))
941 xhci_warn(xhci, "Slot %u endpoint %u "
942 "not removed from BW list!\n",
943 slot_id, i);
944 }
945 /* If this is a hub, free the TT(s) from the TT list */
946 xhci_free_tt_info(xhci, dev, slot_id);
947 /* If necessary, update the number of active TTs on this root port */
948 xhci_update_tt_active_eps(xhci, dev, old_active_eps);
949
950 if (dev->ring_cache) {
951 for (i = 0; i < dev->num_rings_cached; i++)
952 xhci_ring_free(xhci, dev->ring_cache[i]);
953 kfree(dev->ring_cache);
954 }
955
956 if (dev->in_ctx)
957 xhci_free_container_ctx(xhci, dev->in_ctx);
958 if (dev->out_ctx)
959 xhci_free_container_ctx(xhci, dev->out_ctx);
960
961 kfree(xhci->devs[slot_id]);
962 xhci->devs[slot_id] = NULL;
963}
964
965int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
966 struct usb_device *udev, gfp_t flags)
967{
968 struct xhci_virt_device *dev;
969 int i;
970
971 /* Slot ID 0 is reserved */
972 if (slot_id == 0 || xhci->devs[slot_id]) {
973 xhci_warn(xhci, "Bad Slot ID %d\n", slot_id);
974 return 0;
975 }
976
977 xhci->devs[slot_id] = kzalloc(sizeof(*xhci->devs[slot_id]), flags);
978 if (!xhci->devs[slot_id])
979 return 0;
980 dev = xhci->devs[slot_id];
981
982 /* Allocate the (output) device context that will be used in the HC. */
983 dev->out_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_DEVICE, flags);
984 if (!dev->out_ctx)
985 goto fail;
986
987 xhci_dbg(xhci, "Slot %d output ctx = 0x%llx (dma)\n", slot_id,
988 (unsigned long long)dev->out_ctx->dma);
989
990 /* Allocate the (input) device context for address device command */
991 dev->in_ctx = xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT, flags);
992 if (!dev->in_ctx)
993 goto fail;
994
995 xhci_dbg(xhci, "Slot %d input ctx = 0x%llx (dma)\n", slot_id,
996 (unsigned long long)dev->in_ctx->dma);
997
998 /* Initialize the cancellation list and watchdog timers for each ep */
999 for (i = 0; i < 31; i++) {
1000 xhci_init_endpoint_timer(xhci, &dev->eps[i]);
1001 INIT_LIST_HEAD(&dev->eps[i].cancelled_td_list);
1002 INIT_LIST_HEAD(&dev->eps[i].bw_endpoint_list);
1003 }
1004
1005 /* Allocate endpoint 0 ring */
1006 dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, flags);
1007 if (!dev->eps[0].ring)
1008 goto fail;
1009
1010 /* Allocate pointers to the ring cache */
1011 dev->ring_cache = kzalloc(
1012 sizeof(struct xhci_ring *)*XHCI_MAX_RINGS_CACHED,
1013 flags);
1014 if (!dev->ring_cache)
1015 goto fail;
1016 dev->num_rings_cached = 0;
1017
1018 init_completion(&dev->cmd_completion);
1019 dev->udev = udev;
1020
1021 /* Point to output device context in dcbaa. */
1022 xhci->dcbaa->dev_context_ptrs[slot_id] = cpu_to_le64(dev->out_ctx->dma);
1023 xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n",
1024 slot_id,
1025 &xhci->dcbaa->dev_context_ptrs[slot_id],
1026 le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id]));
1027
1028 return 1;
1029fail:
1030 xhci_free_virt_device(xhci, slot_id);
1031 return 0;
1032}
1033
1034void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
1035 struct usb_device *udev)
1036{
1037 struct xhci_virt_device *virt_dev;
1038 struct xhci_ep_ctx *ep0_ctx;
1039 struct xhci_ring *ep_ring;
1040
1041 virt_dev = xhci->devs[udev->slot_id];
1042 ep0_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, 0);
1043 ep_ring = virt_dev->eps[0].ring;
1044 /*
1045 * FIXME we don't keep track of the dequeue pointer very well after a
1046 * Set TR dequeue pointer, so we're setting the dequeue pointer of the
1047 * host to our enqueue pointer. This should only be called after a
1048 * configured device has reset, so all control transfers should have
1049 * been completed or cancelled before the reset.
1050 */
1051 ep0_ctx->deq = cpu_to_le64(xhci_trb_virt_to_dma(ep_ring->enq_seg,
1052 ep_ring->enqueue)
1053 | ep_ring->cycle_state);
1054}
1055
1056/*
1057 * The xHCI roothub may have ports of differing speeds in any order in the port
1058 * status registers. xhci->port_array provides an array of the port speed for
1059 * each offset into the port status registers.
1060 *
1061 * The xHCI hardware wants to know the roothub port number that the USB device
1062 * is attached to (or the roothub port its ancestor hub is attached to). All we
1063 * know is the index of that port under either the USB 2.0 or the USB 3.0
1064 * roothub, but that doesn't give us the real index into the HW port status
1065 * registers. Call xhci_find_raw_port_number() to get real index.
1066 */
1067static u32 xhci_find_real_port_number(struct xhci_hcd *xhci,
1068 struct usb_device *udev)
1069{
1070 struct usb_device *top_dev;
1071 struct usb_hcd *hcd;
1072
1073 if (udev->speed >= USB_SPEED_SUPER)
1074 hcd = xhci->shared_hcd;
1075 else
1076 hcd = xhci->main_hcd;
1077
1078 for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
1079 top_dev = top_dev->parent)
1080 /* Found device below root hub */;
1081
1082 return xhci_find_raw_port_number(hcd, top_dev->portnum);
1083}
1084
1085/* Setup an xHCI virtual device for a Set Address command */
1086int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev)
1087{
1088 struct xhci_virt_device *dev;
1089 struct xhci_ep_ctx *ep0_ctx;
1090 struct xhci_slot_ctx *slot_ctx;
1091 u32 port_num;
1092 u32 max_packets;
1093 struct usb_device *top_dev;
1094
1095 dev = xhci->devs[udev->slot_id];
1096 /* Slot ID 0 is reserved */
1097 if (udev->slot_id == 0 || !dev) {
1098 xhci_warn(xhci, "Slot ID %d is not assigned to this device\n",
1099 udev->slot_id);
1100 return -EINVAL;
1101 }
1102 ep0_ctx = xhci_get_ep_ctx(xhci, dev->in_ctx, 0);
1103 slot_ctx = xhci_get_slot_ctx(xhci, dev->in_ctx);
1104
1105 /* 3) Only the control endpoint is valid - one endpoint context */
1106 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route);
1107 switch (udev->speed) {
1108 case USB_SPEED_SUPER_PLUS:
1109 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP);
1110 max_packets = MAX_PACKET(512);
1111 break;
1112 case USB_SPEED_SUPER:
1113 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
1114 max_packets = MAX_PACKET(512);
1115 break;
1116 case USB_SPEED_HIGH:
1117 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS);
1118 max_packets = MAX_PACKET(64);
1119 break;
1120 /* USB core guesses at a 64-byte max packet first for FS devices */
1121 case USB_SPEED_FULL:
1122 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS);
1123 max_packets = MAX_PACKET(64);
1124 break;
1125 case USB_SPEED_LOW:
1126 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_LS);
1127 max_packets = MAX_PACKET(8);
1128 break;
1129 case USB_SPEED_WIRELESS:
1130 xhci_dbg(xhci, "FIXME xHCI doesn't support wireless speeds\n");
1131 return -EINVAL;
1132 break;
1133 default:
1134 /* Speed was set earlier, this shouldn't happen. */
1135 return -EINVAL;
1136 }
1137 /* Find the root hub port this device is under */
1138 port_num = xhci_find_real_port_number(xhci, udev);
1139 if (!port_num)
1140 return -EINVAL;
1141 slot_ctx->dev_info2 |= cpu_to_le32(ROOT_HUB_PORT(port_num));
1142 /* Set the port number in the virtual_device to the faked port number */
1143 for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
1144 top_dev = top_dev->parent)
1145 /* Found device below root hub */;
1146 dev->fake_port = top_dev->portnum;
1147 dev->real_port = port_num;
1148 xhci_dbg(xhci, "Set root hub portnum to %d\n", port_num);
1149 xhci_dbg(xhci, "Set fake root hub portnum to %d\n", dev->fake_port);
1150
1151 /* Find the right bandwidth table that this device will be a part of.
1152 * If this is a full speed device attached directly to a root port (or a
1153 * decendent of one), it counts as a primary bandwidth domain, not a
1154 * secondary bandwidth domain under a TT. An xhci_tt_info structure
1155 * will never be created for the HS root hub.
1156 */
1157 if (!udev->tt || !udev->tt->hub->parent) {
1158 dev->bw_table = &xhci->rh_bw[port_num - 1].bw_table;
1159 } else {
1160 struct xhci_root_port_bw_info *rh_bw;
1161 struct xhci_tt_bw_info *tt_bw;
1162
1163 rh_bw = &xhci->rh_bw[port_num - 1];
1164 /* Find the right TT. */
1165 list_for_each_entry(tt_bw, &rh_bw->tts, tt_list) {
1166 if (tt_bw->slot_id != udev->tt->hub->slot_id)
1167 continue;
1168
1169 if (!dev->udev->tt->multi ||
1170 (udev->tt->multi &&
1171 tt_bw->ttport == dev->udev->ttport)) {
1172 dev->bw_table = &tt_bw->bw_table;
1173 dev->tt_info = tt_bw;
1174 break;
1175 }
1176 }
1177 if (!dev->tt_info)
1178 xhci_warn(xhci, "WARN: Didn't find a matching TT\n");
1179 }
1180
1181 /* Is this a LS/FS device under an external HS hub? */
1182 if (udev->tt && udev->tt->hub->parent) {
1183 slot_ctx->tt_info = cpu_to_le32(udev->tt->hub->slot_id |
1184 (udev->ttport << 8));
1185 if (udev->tt->multi)
1186 slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
1187 }
1188 xhci_dbg(xhci, "udev->tt = %p\n", udev->tt);
1189 xhci_dbg(xhci, "udev->ttport = 0x%x\n", udev->ttport);
1190
1191 /* Step 4 - ring already allocated */
1192 /* Step 5 */
1193 ep0_ctx->ep_info2 = cpu_to_le32(EP_TYPE(CTRL_EP));
1194
1195 /* EP 0 can handle "burst" sizes of 1, so Max Burst Size field is 0 */
1196 ep0_ctx->ep_info2 |= cpu_to_le32(MAX_BURST(0) | ERROR_COUNT(3) |
1197 max_packets);
1198
1199 ep0_ctx->deq = cpu_to_le64(dev->eps[0].ring->first_seg->dma |
1200 dev->eps[0].ring->cycle_state);
1201
1202 /* Steps 7 and 8 were done in xhci_alloc_virt_device() */
1203
1204 return 0;
1205}
1206
1207/*
1208 * Convert interval expressed as 2^(bInterval - 1) == interval into
1209 * straight exponent value 2^n == interval.
1210 *
1211 */
1212static unsigned int xhci_parse_exponent_interval(struct usb_device *udev,
1213 struct usb_host_endpoint *ep)
1214{
1215 unsigned int interval;
1216
1217 interval = clamp_val(ep->desc.bInterval, 1, 16) - 1;
1218 if (interval != ep->desc.bInterval - 1)
1219 dev_warn(&udev->dev,
1220 "ep %#x - rounding interval to %d %sframes\n",
1221 ep->desc.bEndpointAddress,
1222 1 << interval,
1223 udev->speed == USB_SPEED_FULL ? "" : "micro");
1224
1225 if (udev->speed == USB_SPEED_FULL) {
1226 /*
1227 * Full speed isoc endpoints specify interval in frames,
1228 * not microframes. We are using microframes everywhere,
1229 * so adjust accordingly.
1230 */
1231 interval += 3; /* 1 frame = 2^3 uframes */
1232 }
1233
1234 return interval;
1235}
1236
1237/*
1238 * Convert bInterval expressed in microframes (in 1-255 range) to exponent of
1239 * microframes, rounded down to nearest power of 2.
1240 */
1241static unsigned int xhci_microframes_to_exponent(struct usb_device *udev,
1242 struct usb_host_endpoint *ep, unsigned int desc_interval,
1243 unsigned int min_exponent, unsigned int max_exponent)
1244{
1245 unsigned int interval;
1246
1247 interval = fls(desc_interval) - 1;
1248 interval = clamp_val(interval, min_exponent, max_exponent);
1249 if ((1 << interval) != desc_interval)
1250 dev_dbg(&udev->dev,
1251 "ep %#x - rounding interval to %d microframes, ep desc says %d microframes\n",
1252 ep->desc.bEndpointAddress,
1253 1 << interval,
1254 desc_interval);
1255
1256 return interval;
1257}
1258
1259static unsigned int xhci_parse_microframe_interval(struct usb_device *udev,
1260 struct usb_host_endpoint *ep)
1261{
1262 if (ep->desc.bInterval == 0)
1263 return 0;
1264 return xhci_microframes_to_exponent(udev, ep,
1265 ep->desc.bInterval, 0, 15);
1266}
1267
1268
1269static unsigned int xhci_parse_frame_interval(struct usb_device *udev,
1270 struct usb_host_endpoint *ep)
1271{
1272 return xhci_microframes_to_exponent(udev, ep,
1273 ep->desc.bInterval * 8, 3, 10);
1274}
1275
1276/* Return the polling or NAK interval.
1277 *
1278 * The polling interval is expressed in "microframes". If xHCI's Interval field
1279 * is set to N, it will service the endpoint every 2^(Interval)*125us.
1280 *
1281 * The NAK interval is one NAK per 1 to 255 microframes, or no NAKs if interval
1282 * is set to 0.
1283 */
1284static unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
1285 struct usb_host_endpoint *ep)
1286{
1287 unsigned int interval = 0;
1288
1289 switch (udev->speed) {
1290 case USB_SPEED_HIGH:
1291 /* Max NAK rate */
1292 if (usb_endpoint_xfer_control(&ep->desc) ||
1293 usb_endpoint_xfer_bulk(&ep->desc)) {
1294 interval = xhci_parse_microframe_interval(udev, ep);
1295 break;
1296 }
1297 /* Fall through - SS and HS isoc/int have same decoding */
1298
1299 case USB_SPEED_SUPER_PLUS:
1300 case USB_SPEED_SUPER:
1301 if (usb_endpoint_xfer_int(&ep->desc) ||
1302 usb_endpoint_xfer_isoc(&ep->desc)) {
1303 interval = xhci_parse_exponent_interval(udev, ep);
1304 }
1305 break;
1306
1307 case USB_SPEED_FULL:
1308 if (usb_endpoint_xfer_isoc(&ep->desc)) {
1309 interval = xhci_parse_exponent_interval(udev, ep);
1310 break;
1311 }
1312 /*
1313 * Fall through for interrupt endpoint interval decoding
1314 * since it uses the same rules as low speed interrupt
1315 * endpoints.
1316 */
1317
1318 case USB_SPEED_LOW:
1319 if (usb_endpoint_xfer_int(&ep->desc) ||
1320 usb_endpoint_xfer_isoc(&ep->desc)) {
1321
1322 interval = xhci_parse_frame_interval(udev, ep);
1323 }
1324 break;
1325
1326 default:
1327 BUG();
1328 }
1329 return interval;
1330}
1331
1332/* The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps.
1333 * High speed endpoint descriptors can define "the number of additional
1334 * transaction opportunities per microframe", but that goes in the Max Burst
1335 * endpoint context field.
1336 */
1337static u32 xhci_get_endpoint_mult(struct usb_device *udev,
1338 struct usb_host_endpoint *ep)
1339{
1340 if (udev->speed < USB_SPEED_SUPER ||
1341 !usb_endpoint_xfer_isoc(&ep->desc))
1342 return 0;
1343 return ep->ss_ep_comp.bmAttributes;
1344}
1345
1346static u32 xhci_get_endpoint_max_burst(struct usb_device *udev,
1347 struct usb_host_endpoint *ep)
1348{
1349 /* Super speed and Plus have max burst in ep companion desc */
1350 if (udev->speed >= USB_SPEED_SUPER)
1351 return ep->ss_ep_comp.bMaxBurst;
1352
1353 if (udev->speed == USB_SPEED_HIGH &&
1354 (usb_endpoint_xfer_isoc(&ep->desc) ||
1355 usb_endpoint_xfer_int(&ep->desc)))
1356 return (usb_endpoint_maxp(&ep->desc) & 0x1800) >> 11;
1357
1358 return 0;
1359}
1360
1361static u32 xhci_get_endpoint_type(struct usb_host_endpoint *ep)
1362{
1363 int in;
1364
1365 in = usb_endpoint_dir_in(&ep->desc);
1366
1367 if (usb_endpoint_xfer_control(&ep->desc))
1368 return CTRL_EP;
1369 if (usb_endpoint_xfer_bulk(&ep->desc))
1370 return in ? BULK_IN_EP : BULK_OUT_EP;
1371 if (usb_endpoint_xfer_isoc(&ep->desc))
1372 return in ? ISOC_IN_EP : ISOC_OUT_EP;
1373 if (usb_endpoint_xfer_int(&ep->desc))
1374 return in ? INT_IN_EP : INT_OUT_EP;
1375 return 0;
1376}
1377
1378/* Return the maximum endpoint service interval time (ESIT) payload.
1379 * Basically, this is the maxpacket size, multiplied by the burst size
1380 * and mult size.
1381 */
1382static u32 xhci_get_max_esit_payload(struct usb_device *udev,
1383 struct usb_host_endpoint *ep)
1384{
1385 int max_burst;
1386 int max_packet;
1387
1388 /* Only applies for interrupt or isochronous endpoints */
1389 if (usb_endpoint_xfer_control(&ep->desc) ||
1390 usb_endpoint_xfer_bulk(&ep->desc))
1391 return 0;
1392
1393 /* SuperSpeedPlus Isoc ep sending over 48k per esit */
1394 if ((udev->speed >= USB_SPEED_SUPER_PLUS) &&
1395 USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes))
1396 return le32_to_cpu(ep->ssp_isoc_ep_comp.dwBytesPerInterval);
1397 /* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */
1398 else if (udev->speed >= USB_SPEED_SUPER)
1399 return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval);
1400
1401 max_packet = GET_MAX_PACKET(usb_endpoint_maxp(&ep->desc));
1402 max_burst = (usb_endpoint_maxp(&ep->desc) & 0x1800) >> 11;
1403 /* A 0 in max burst means 1 transfer per ESIT */
1404 return max_packet * (max_burst + 1);
1405}
1406
1407/* Set up an endpoint with one ring segment. Do not allocate stream rings.
1408 * Drivers will have to call usb_alloc_streams() to do that.
1409 */
1410int xhci_endpoint_init(struct xhci_hcd *xhci,
1411 struct xhci_virt_device *virt_dev,
1412 struct usb_device *udev,
1413 struct usb_host_endpoint *ep,
1414 gfp_t mem_flags)
1415{
1416 unsigned int ep_index;
1417 struct xhci_ep_ctx *ep_ctx;
1418 struct xhci_ring *ep_ring;
1419 unsigned int max_packet;
1420 enum xhci_ring_type ring_type;
1421 u32 max_esit_payload;
1422 u32 endpoint_type;
1423 unsigned int max_burst;
1424 unsigned int interval;
1425 unsigned int mult;
1426 unsigned int avg_trb_len;
1427 unsigned int err_count = 0;
1428
1429 ep_index = xhci_get_endpoint_index(&ep->desc);
1430 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
1431
1432 endpoint_type = xhci_get_endpoint_type(ep);
1433 if (!endpoint_type)
1434 return -EINVAL;
1435
1436 ring_type = usb_endpoint_type(&ep->desc);
1437 /* Set up the endpoint ring */
1438 virt_dev->eps[ep_index].new_ring =
1439 xhci_ring_alloc(xhci, 2, 1, ring_type, mem_flags);
1440 if (!virt_dev->eps[ep_index].new_ring) {
1441 /* Attempt to use the ring cache */
1442 if (virt_dev->num_rings_cached == 0)
1443 return -ENOMEM;
1444 virt_dev->num_rings_cached--;
1445 virt_dev->eps[ep_index].new_ring =
1446 virt_dev->ring_cache[virt_dev->num_rings_cached];
1447 virt_dev->ring_cache[virt_dev->num_rings_cached] = NULL;
1448 xhci_reinit_cached_ring(xhci, virt_dev->eps[ep_index].new_ring,
1449 1, ring_type);
1450 }
1451 virt_dev->eps[ep_index].skip = false;
1452 ep_ring = virt_dev->eps[ep_index].new_ring;
1453
1454 /*
1455 * Get values to fill the endpoint context, mostly from ep descriptor.
1456 * The average TRB buffer lengt for bulk endpoints is unclear as we
1457 * have no clue on scatter gather list entry size. For Isoc and Int,
1458 * set it to max available. See xHCI 1.1 spec 4.14.1.1 for details.
1459 */
1460 max_esit_payload = xhci_get_max_esit_payload(udev, ep);
1461 interval = xhci_get_endpoint_interval(udev, ep);
1462 mult = xhci_get_endpoint_mult(udev, ep);
1463 max_packet = GET_MAX_PACKET(usb_endpoint_maxp(&ep->desc));
1464 max_burst = xhci_get_endpoint_max_burst(udev, ep);
1465 avg_trb_len = max_esit_payload;
1466
1467 /* FIXME dig Mult and streams info out of ep companion desc */
1468
1469 /* Allow 3 retries for everything but isoc, set CErr = 3 */
1470 if (!usb_endpoint_xfer_isoc(&ep->desc))
1471 err_count = 3;
1472 /* Some devices get this wrong */
1473 if (usb_endpoint_xfer_bulk(&ep->desc) && udev->speed == USB_SPEED_HIGH)
1474 max_packet = 512;
1475 /* xHCI 1.0 and 1.1 indicates that ctrl ep avg TRB Length should be 8 */
1476 if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version >= 0x100)
1477 avg_trb_len = 8;
1478 /* xhci 1.1 with LEC support doesn't use mult field, use RsvdZ */
1479 if ((xhci->hci_version > 0x100) && HCC2_LEC(xhci->hcc_params2))
1480 mult = 0;
1481
1482 /* Fill the endpoint context */
1483 ep_ctx->ep_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_HI(max_esit_payload) |
1484 EP_INTERVAL(interval) |
1485 EP_MULT(mult));
1486 ep_ctx->ep_info2 = cpu_to_le32(EP_TYPE(endpoint_type) |
1487 MAX_PACKET(max_packet) |
1488 MAX_BURST(max_burst) |
1489 ERROR_COUNT(err_count));
1490 ep_ctx->deq = cpu_to_le64(ep_ring->first_seg->dma |
1491 ep_ring->cycle_state);
1492
1493 ep_ctx->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) |
1494 EP_AVG_TRB_LENGTH(avg_trb_len));
1495
1496 /* FIXME Debug endpoint context */
1497 return 0;
1498}
1499
1500void xhci_endpoint_zero(struct xhci_hcd *xhci,
1501 struct xhci_virt_device *virt_dev,
1502 struct usb_host_endpoint *ep)
1503{
1504 unsigned int ep_index;
1505 struct xhci_ep_ctx *ep_ctx;
1506
1507 ep_index = xhci_get_endpoint_index(&ep->desc);
1508 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
1509
1510 ep_ctx->ep_info = 0;
1511 ep_ctx->ep_info2 = 0;
1512 ep_ctx->deq = 0;
1513 ep_ctx->tx_info = 0;
1514 /* Don't free the endpoint ring until the set interface or configuration
1515 * request succeeds.
1516 */
1517}
1518
1519void xhci_clear_endpoint_bw_info(struct xhci_bw_info *bw_info)
1520{
1521 bw_info->ep_interval = 0;
1522 bw_info->mult = 0;
1523 bw_info->num_packets = 0;
1524 bw_info->max_packet_size = 0;
1525 bw_info->type = 0;
1526 bw_info->max_esit_payload = 0;
1527}
1528
1529void xhci_update_bw_info(struct xhci_hcd *xhci,
1530 struct xhci_container_ctx *in_ctx,
1531 struct xhci_input_control_ctx *ctrl_ctx,
1532 struct xhci_virt_device *virt_dev)
1533{
1534 struct xhci_bw_info *bw_info;
1535 struct xhci_ep_ctx *ep_ctx;
1536 unsigned int ep_type;
1537 int i;
1538
1539 for (i = 1; i < 31; ++i) {
1540 bw_info = &virt_dev->eps[i].bw_info;
1541
1542 /* We can't tell what endpoint type is being dropped, but
1543 * unconditionally clearing the bandwidth info for non-periodic
1544 * endpoints should be harmless because the info will never be
1545 * set in the first place.
1546 */
1547 if (!EP_IS_ADDED(ctrl_ctx, i) && EP_IS_DROPPED(ctrl_ctx, i)) {
1548 /* Dropped endpoint */
1549 xhci_clear_endpoint_bw_info(bw_info);
1550 continue;
1551 }
1552
1553 if (EP_IS_ADDED(ctrl_ctx, i)) {
1554 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, i);
1555 ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
1556
1557 /* Ignore non-periodic endpoints */
1558 if (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP &&
1559 ep_type != ISOC_IN_EP &&
1560 ep_type != INT_IN_EP)
1561 continue;
1562
1563 /* Added or changed endpoint */
1564 bw_info->ep_interval = CTX_TO_EP_INTERVAL(
1565 le32_to_cpu(ep_ctx->ep_info));
1566 /* Number of packets and mult are zero-based in the
1567 * input context, but we want one-based for the
1568 * interval table.
1569 */
1570 bw_info->mult = CTX_TO_EP_MULT(
1571 le32_to_cpu(ep_ctx->ep_info)) + 1;
1572 bw_info->num_packets = CTX_TO_MAX_BURST(
1573 le32_to_cpu(ep_ctx->ep_info2)) + 1;
1574 bw_info->max_packet_size = MAX_PACKET_DECODED(
1575 le32_to_cpu(ep_ctx->ep_info2));
1576 bw_info->type = ep_type;
1577 bw_info->max_esit_payload = CTX_TO_MAX_ESIT_PAYLOAD(
1578 le32_to_cpu(ep_ctx->tx_info));
1579 }
1580 }
1581}
1582
1583/* Copy output xhci_ep_ctx to the input xhci_ep_ctx copy.
1584 * Useful when you want to change one particular aspect of the endpoint and then
1585 * issue a configure endpoint command.
1586 */
1587void xhci_endpoint_copy(struct xhci_hcd *xhci,
1588 struct xhci_container_ctx *in_ctx,
1589 struct xhci_container_ctx *out_ctx,
1590 unsigned int ep_index)
1591{
1592 struct xhci_ep_ctx *out_ep_ctx;
1593 struct xhci_ep_ctx *in_ep_ctx;
1594
1595 out_ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1596 in_ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
1597
1598 in_ep_ctx->ep_info = out_ep_ctx->ep_info;
1599 in_ep_ctx->ep_info2 = out_ep_ctx->ep_info2;
1600 in_ep_ctx->deq = out_ep_ctx->deq;
1601 in_ep_ctx->tx_info = out_ep_ctx->tx_info;
1602}
1603
1604/* Copy output xhci_slot_ctx to the input xhci_slot_ctx.
1605 * Useful when you want to change one particular aspect of the endpoint and then
1606 * issue a configure endpoint command. Only the context entries field matters,
1607 * but we'll copy the whole thing anyway.
1608 */
1609void xhci_slot_copy(struct xhci_hcd *xhci,
1610 struct xhci_container_ctx *in_ctx,
1611 struct xhci_container_ctx *out_ctx)
1612{
1613 struct xhci_slot_ctx *in_slot_ctx;
1614 struct xhci_slot_ctx *out_slot_ctx;
1615
1616 in_slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1617 out_slot_ctx = xhci_get_slot_ctx(xhci, out_ctx);
1618
1619 in_slot_ctx->dev_info = out_slot_ctx->dev_info;
1620 in_slot_ctx->dev_info2 = out_slot_ctx->dev_info2;
1621 in_slot_ctx->tt_info = out_slot_ctx->tt_info;
1622 in_slot_ctx->dev_state = out_slot_ctx->dev_state;
1623}
1624
1625/* Set up the scratchpad buffer array and scratchpad buffers, if needed. */
1626static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
1627{
1628 int i;
1629 struct device *dev = xhci_to_hcd(xhci)->self.controller;
1630 int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
1631
1632 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1633 "Allocating %d scratchpad buffers", num_sp);
1634
1635 if (!num_sp)
1636 return 0;
1637
1638 xhci->scratchpad = kzalloc(sizeof(*xhci->scratchpad), flags);
1639 if (!xhci->scratchpad)
1640 goto fail_sp;
1641
1642 xhci->scratchpad->sp_array = dma_alloc_coherent(dev,
1643 num_sp * sizeof(u64),
1644 &xhci->scratchpad->sp_dma, flags);
1645 if (!xhci->scratchpad->sp_array)
1646 goto fail_sp2;
1647
1648 xhci->scratchpad->sp_buffers = kzalloc(sizeof(void *) * num_sp, flags);
1649 if (!xhci->scratchpad->sp_buffers)
1650 goto fail_sp3;
1651
1652 xhci->scratchpad->sp_dma_buffers =
1653 kzalloc(sizeof(dma_addr_t) * num_sp, flags);
1654
1655 if (!xhci->scratchpad->sp_dma_buffers)
1656 goto fail_sp4;
1657
1658 xhci->dcbaa->dev_context_ptrs[0] = cpu_to_le64(xhci->scratchpad->sp_dma);
1659 for (i = 0; i < num_sp; i++) {
1660 dma_addr_t dma;
1661 void *buf = dma_alloc_coherent(dev, xhci->page_size, &dma,
1662 flags);
1663 if (!buf)
1664 goto fail_sp5;
1665
1666 xhci->scratchpad->sp_array[i] = dma;
1667 xhci->scratchpad->sp_buffers[i] = buf;
1668 xhci->scratchpad->sp_dma_buffers[i] = dma;
1669 }
1670
1671 return 0;
1672
1673 fail_sp5:
1674 for (i = i - 1; i >= 0; i--) {
1675 dma_free_coherent(dev, xhci->page_size,
1676 xhci->scratchpad->sp_buffers[i],
1677 xhci->scratchpad->sp_dma_buffers[i]);
1678 }
1679 kfree(xhci->scratchpad->sp_dma_buffers);
1680
1681 fail_sp4:
1682 kfree(xhci->scratchpad->sp_buffers);
1683
1684 fail_sp3:
1685 dma_free_coherent(dev, num_sp * sizeof(u64),
1686 xhci->scratchpad->sp_array,
1687 xhci->scratchpad->sp_dma);
1688
1689 fail_sp2:
1690 kfree(xhci->scratchpad);
1691 xhci->scratchpad = NULL;
1692
1693 fail_sp:
1694 return -ENOMEM;
1695}
1696
1697static void scratchpad_free(struct xhci_hcd *xhci)
1698{
1699 int num_sp;
1700 int i;
1701 struct device *dev = xhci_to_hcd(xhci)->self.controller;
1702
1703 if (!xhci->scratchpad)
1704 return;
1705
1706 num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
1707
1708 for (i = 0; i < num_sp; i++) {
1709 dma_free_coherent(dev, xhci->page_size,
1710 xhci->scratchpad->sp_buffers[i],
1711 xhci->scratchpad->sp_dma_buffers[i]);
1712 }
1713 kfree(xhci->scratchpad->sp_dma_buffers);
1714 kfree(xhci->scratchpad->sp_buffers);
1715 dma_free_coherent(dev, num_sp * sizeof(u64),
1716 xhci->scratchpad->sp_array,
1717 xhci->scratchpad->sp_dma);
1718 kfree(xhci->scratchpad);
1719 xhci->scratchpad = NULL;
1720}
1721
1722struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
1723 bool allocate_in_ctx, bool allocate_completion,
1724 gfp_t mem_flags)
1725{
1726 struct xhci_command *command;
1727
1728 command = kzalloc(sizeof(*command), mem_flags);
1729 if (!command)
1730 return NULL;
1731
1732 if (allocate_in_ctx) {
1733 command->in_ctx =
1734 xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT,
1735 mem_flags);
1736 if (!command->in_ctx) {
1737 kfree(command);
1738 return NULL;
1739 }
1740 }
1741
1742 if (allocate_completion) {
1743 command->completion =
1744 kzalloc(sizeof(struct completion), mem_flags);
1745 if (!command->completion) {
1746 xhci_free_container_ctx(xhci, command->in_ctx);
1747 kfree(command);
1748 return NULL;
1749 }
1750 init_completion(command->completion);
1751 }
1752
1753 command->status = 0;
1754 INIT_LIST_HEAD(&command->cmd_list);
1755 return command;
1756}
1757
1758void xhci_urb_free_priv(struct urb_priv *urb_priv)
1759{
1760 if (urb_priv) {
1761 kfree(urb_priv->td[0]);
1762 kfree(urb_priv);
1763 }
1764}
1765
1766void xhci_free_command(struct xhci_hcd *xhci,
1767 struct xhci_command *command)
1768{
1769 xhci_free_container_ctx(xhci,
1770 command->in_ctx);
1771 kfree(command->completion);
1772 kfree(command);
1773}
1774
1775void xhci_mem_cleanup(struct xhci_hcd *xhci)
1776{
1777 struct device *dev = xhci_to_hcd(xhci)->self.controller;
1778 int size;
1779 int i, j, num_ports;
1780
1781 del_timer_sync(&xhci->cmd_timer);
1782
1783 /* Free the Event Ring Segment Table and the actual Event Ring */
1784 size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries);
1785 if (xhci->erst.entries)
1786 dma_free_coherent(dev, size,
1787 xhci->erst.entries, xhci->erst.erst_dma_addr);
1788 xhci->erst.entries = NULL;
1789 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed ERST");
1790 if (xhci->event_ring)
1791 xhci_ring_free(xhci, xhci->event_ring);
1792 xhci->event_ring = NULL;
1793 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed event ring");
1794
1795 if (xhci->lpm_command)
1796 xhci_free_command(xhci, xhci->lpm_command);
1797 xhci->lpm_command = NULL;
1798 if (xhci->cmd_ring)
1799 xhci_ring_free(xhci, xhci->cmd_ring);
1800 xhci->cmd_ring = NULL;
1801 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed command ring");
1802 xhci_cleanup_command_queue(xhci);
1803
1804 num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
1805 for (i = 0; i < num_ports && xhci->rh_bw; i++) {
1806 struct xhci_interval_bw_table *bwt = &xhci->rh_bw[i].bw_table;
1807 for (j = 0; j < XHCI_MAX_INTERVAL; j++) {
1808 struct list_head *ep = &bwt->interval_bw[j].endpoints;
1809 while (!list_empty(ep))
1810 list_del_init(ep->next);
1811 }
1812 }
1813
1814 for (i = 1; i < MAX_HC_SLOTS; ++i)
1815 xhci_free_virt_device(xhci, i);
1816
1817 dma_pool_destroy(xhci->segment_pool);
1818 xhci->segment_pool = NULL;
1819 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed segment pool");
1820
1821 dma_pool_destroy(xhci->device_pool);
1822 xhci->device_pool = NULL;
1823 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Freed device context pool");
1824
1825 dma_pool_destroy(xhci->small_streams_pool);
1826 xhci->small_streams_pool = NULL;
1827 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1828 "Freed small stream array pool");
1829
1830 dma_pool_destroy(xhci->medium_streams_pool);
1831 xhci->medium_streams_pool = NULL;
1832 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
1833 "Freed medium stream array pool");
1834
1835 if (xhci->dcbaa)
1836 dma_free_coherent(dev, sizeof(*xhci->dcbaa),
1837 xhci->dcbaa, xhci->dcbaa->dma);
1838 xhci->dcbaa = NULL;
1839
1840 scratchpad_free(xhci);
1841
1842 if (!xhci->rh_bw)
1843 goto no_bw;
1844
1845 for (i = 0; i < num_ports; i++) {
1846 struct xhci_tt_bw_info *tt, *n;
1847 list_for_each_entry_safe(tt, n, &xhci->rh_bw[i].tts, tt_list) {
1848 list_del(&tt->tt_list);
1849 kfree(tt);
1850 }
1851 }
1852
1853no_bw:
1854 xhci->cmd_ring_reserved_trbs = 0;
1855 xhci->num_usb2_ports = 0;
1856 xhci->num_usb3_ports = 0;
1857 xhci->num_active_eps = 0;
1858 kfree(xhci->usb2_ports);
1859 kfree(xhci->usb3_ports);
1860 kfree(xhci->port_array);
1861 kfree(xhci->rh_bw);
1862 kfree(xhci->ext_caps);
1863
1864 xhci->usb2_ports = NULL;
1865 xhci->usb3_ports = NULL;
1866 xhci->port_array = NULL;
1867 xhci->rh_bw = NULL;
1868 xhci->ext_caps = NULL;
1869
1870 xhci->page_size = 0;
1871 xhci->page_shift = 0;
1872 xhci->bus_state[0].bus_suspended = 0;
1873 xhci->bus_state[1].bus_suspended = 0;
1874}
1875
1876static int xhci_test_trb_in_td(struct xhci_hcd *xhci,
1877 struct xhci_segment *input_seg,
1878 union xhci_trb *start_trb,
1879 union xhci_trb *end_trb,
1880 dma_addr_t input_dma,
1881 struct xhci_segment *result_seg,
1882 char *test_name, int test_number)
1883{
1884 unsigned long long start_dma;
1885 unsigned long long end_dma;
1886 struct xhci_segment *seg;
1887
1888 start_dma = xhci_trb_virt_to_dma(input_seg, start_trb);
1889 end_dma = xhci_trb_virt_to_dma(input_seg, end_trb);
1890
1891 seg = trb_in_td(xhci, input_seg, start_trb, end_trb, input_dma, false);
1892 if (seg != result_seg) {
1893 xhci_warn(xhci, "WARN: %s TRB math test %d failed!\n",
1894 test_name, test_number);
1895 xhci_warn(xhci, "Tested TRB math w/ seg %p and "
1896 "input DMA 0x%llx\n",
1897 input_seg,
1898 (unsigned long long) input_dma);
1899 xhci_warn(xhci, "starting TRB %p (0x%llx DMA), "
1900 "ending TRB %p (0x%llx DMA)\n",
1901 start_trb, start_dma,
1902 end_trb, end_dma);
1903 xhci_warn(xhci, "Expected seg %p, got seg %p\n",
1904 result_seg, seg);
1905 trb_in_td(xhci, input_seg, start_trb, end_trb, input_dma,
1906 true);
1907 return -1;
1908 }
1909 return 0;
1910}
1911
1912/* TRB math checks for xhci_trb_in_td(), using the command and event rings. */
1913static int xhci_check_trb_in_td_math(struct xhci_hcd *xhci)
1914{
1915 struct {
1916 dma_addr_t input_dma;
1917 struct xhci_segment *result_seg;
1918 } simple_test_vector [] = {
1919 /* A zeroed DMA field should fail */
1920 { 0, NULL },
1921 /* One TRB before the ring start should fail */
1922 { xhci->event_ring->first_seg->dma - 16, NULL },
1923 /* One byte before the ring start should fail */
1924 { xhci->event_ring->first_seg->dma - 1, NULL },
1925 /* Starting TRB should succeed */
1926 { xhci->event_ring->first_seg->dma, xhci->event_ring->first_seg },
1927 /* Ending TRB should succeed */
1928 { xhci->event_ring->first_seg->dma + (TRBS_PER_SEGMENT - 1)*16,
1929 xhci->event_ring->first_seg },
1930 /* One byte after the ring end should fail */
1931 { xhci->event_ring->first_seg->dma + (TRBS_PER_SEGMENT - 1)*16 + 1, NULL },
1932 /* One TRB after the ring end should fail */
1933 { xhci->event_ring->first_seg->dma + (TRBS_PER_SEGMENT)*16, NULL },
1934 /* An address of all ones should fail */
1935 { (dma_addr_t) (~0), NULL },
1936 };
1937 struct {
1938 struct xhci_segment *input_seg;
1939 union xhci_trb *start_trb;
1940 union xhci_trb *end_trb;
1941 dma_addr_t input_dma;
1942 struct xhci_segment *result_seg;
1943 } complex_test_vector [] = {
1944 /* Test feeding a valid DMA address from a different ring */
1945 { .input_seg = xhci->event_ring->first_seg,
1946 .start_trb = xhci->event_ring->first_seg->trbs,
1947 .end_trb = &xhci->event_ring->first_seg->trbs[TRBS_PER_SEGMENT - 1],
1948 .input_dma = xhci->cmd_ring->first_seg->dma,
1949 .result_seg = NULL,
1950 },
1951 /* Test feeding a valid end TRB from a different ring */
1952 { .input_seg = xhci->event_ring->first_seg,
1953 .start_trb = xhci->event_ring->first_seg->trbs,
1954 .end_trb = &xhci->cmd_ring->first_seg->trbs[TRBS_PER_SEGMENT - 1],
1955 .input_dma = xhci->cmd_ring->first_seg->dma,
1956 .result_seg = NULL,
1957 },
1958 /* Test feeding a valid start and end TRB from a different ring */
1959 { .input_seg = xhci->event_ring->first_seg,
1960 .start_trb = xhci->cmd_ring->first_seg->trbs,
1961 .end_trb = &xhci->cmd_ring->first_seg->trbs[TRBS_PER_SEGMENT - 1],
1962 .input_dma = xhci->cmd_ring->first_seg->dma,
1963 .result_seg = NULL,
1964 },
1965 /* TRB in this ring, but after this TD */
1966 { .input_seg = xhci->event_ring->first_seg,
1967 .start_trb = &xhci->event_ring->first_seg->trbs[0],
1968 .end_trb = &xhci->event_ring->first_seg->trbs[3],
1969 .input_dma = xhci->event_ring->first_seg->dma + 4*16,
1970 .result_seg = NULL,
1971 },
1972 /* TRB in this ring, but before this TD */
1973 { .input_seg = xhci->event_ring->first_seg,
1974 .start_trb = &xhci->event_ring->first_seg->trbs[3],
1975 .end_trb = &xhci->event_ring->first_seg->trbs[6],
1976 .input_dma = xhci->event_ring->first_seg->dma + 2*16,
1977 .result_seg = NULL,
1978 },
1979 /* TRB in this ring, but after this wrapped TD */
1980 { .input_seg = xhci->event_ring->first_seg,
1981 .start_trb = &xhci->event_ring->first_seg->trbs[TRBS_PER_SEGMENT - 3],
1982 .end_trb = &xhci->event_ring->first_seg->trbs[1],
1983 .input_dma = xhci->event_ring->first_seg->dma + 2*16,
1984 .result_seg = NULL,
1985 },
1986 /* TRB in this ring, but before this wrapped TD */
1987 { .input_seg = xhci->event_ring->first_seg,
1988 .start_trb = &xhci->event_ring->first_seg->trbs[TRBS_PER_SEGMENT - 3],
1989 .end_trb = &xhci->event_ring->first_seg->trbs[1],
1990 .input_dma = xhci->event_ring->first_seg->dma + (TRBS_PER_SEGMENT - 4)*16,
1991 .result_seg = NULL,
1992 },
1993 /* TRB not in this ring, and we have a wrapped TD */
1994 { .input_seg = xhci->event_ring->first_seg,
1995 .start_trb = &xhci->event_ring->first_seg->trbs[TRBS_PER_SEGMENT - 3],
1996 .end_trb = &xhci->event_ring->first_seg->trbs[1],
1997 .input_dma = xhci->cmd_ring->first_seg->dma + 2*16,
1998 .result_seg = NULL,
1999 },
2000 };
2001
2002 unsigned int num_tests;
2003 int i, ret;
2004
2005 num_tests = ARRAY_SIZE(simple_test_vector);
2006 for (i = 0; i < num_tests; i++) {
2007 ret = xhci_test_trb_in_td(xhci,
2008 xhci->event_ring->first_seg,
2009 xhci->event_ring->first_seg->trbs,
2010 &xhci->event_ring->first_seg->trbs[TRBS_PER_SEGMENT - 1],
2011 simple_test_vector[i].input_dma,
2012 simple_test_vector[i].result_seg,
2013 "Simple", i);
2014 if (ret < 0)
2015 return ret;
2016 }
2017
2018 num_tests = ARRAY_SIZE(complex_test_vector);
2019 for (i = 0; i < num_tests; i++) {
2020 ret = xhci_test_trb_in_td(xhci,
2021 complex_test_vector[i].input_seg,
2022 complex_test_vector[i].start_trb,
2023 complex_test_vector[i].end_trb,
2024 complex_test_vector[i].input_dma,
2025 complex_test_vector[i].result_seg,
2026 "Complex", i);
2027 if (ret < 0)
2028 return ret;
2029 }
2030 xhci_dbg(xhci, "TRB math tests passed.\n");
2031 return 0;
2032}
2033
2034static void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
2035{
2036 u64 temp;
2037 dma_addr_t deq;
2038
2039 deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
2040 xhci->event_ring->dequeue);
2041 if (deq == 0 && !in_interrupt())
2042 xhci_warn(xhci, "WARN something wrong with SW event ring "
2043 "dequeue ptr.\n");
2044 /* Update HC event ring dequeue pointer */
2045 temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2046 temp &= ERST_PTR_MASK;
2047 /* Don't clear the EHB bit (which is RW1C) because
2048 * there might be more events to service.
2049 */
2050 temp &= ~ERST_EHB;
2051 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2052 "// Write event ring dequeue pointer, "
2053 "preserving EHB bit");
2054 xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp,
2055 &xhci->ir_set->erst_dequeue);
2056}
2057
2058static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
2059 __le32 __iomem *addr, int max_caps)
2060{
2061 u32 temp, port_offset, port_count;
2062 int i;
2063 u8 major_revision;
2064 struct xhci_hub *rhub;
2065
2066 temp = readl(addr);
2067 major_revision = XHCI_EXT_PORT_MAJOR(temp);
2068
2069 if (major_revision == 0x03) {
2070 rhub = &xhci->usb3_rhub;
2071 } else if (major_revision <= 0x02) {
2072 rhub = &xhci->usb2_rhub;
2073 } else {
2074 xhci_warn(xhci, "Ignoring unknown port speed, "
2075 "Ext Cap %p, revision = 0x%x\n",
2076 addr, major_revision);
2077 /* Ignoring port protocol we can't understand. FIXME */
2078 return;
2079 }
2080 rhub->maj_rev = XHCI_EXT_PORT_MAJOR(temp);
2081 rhub->min_rev = XHCI_EXT_PORT_MINOR(temp);
2082
2083 /* Port offset and count in the third dword, see section 7.2 */
2084 temp = readl(addr + 2);
2085 port_offset = XHCI_EXT_PORT_OFF(temp);
2086 port_count = XHCI_EXT_PORT_COUNT(temp);
2087 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2088 "Ext Cap %p, port offset = %u, "
2089 "count = %u, revision = 0x%x",
2090 addr, port_offset, port_count, major_revision);
2091 /* Port count includes the current port offset */
2092 if (port_offset == 0 || (port_offset + port_count - 1) > num_ports)
2093 /* WTF? "Valid values are ‘1’ to MaxPorts" */
2094 return;
2095
2096 rhub->psi_count = XHCI_EXT_PORT_PSIC(temp);
2097 if (rhub->psi_count) {
2098 rhub->psi = kcalloc(rhub->psi_count, sizeof(*rhub->psi),
2099 GFP_KERNEL);
2100 if (!rhub->psi)
2101 rhub->psi_count = 0;
2102
2103 rhub->psi_uid_count++;
2104 for (i = 0; i < rhub->psi_count; i++) {
2105 rhub->psi[i] = readl(addr + 4 + i);
2106
2107 /* count unique ID values, two consecutive entries can
2108 * have the same ID if link is assymetric
2109 */
2110 if (i && (XHCI_EXT_PORT_PSIV(rhub->psi[i]) !=
2111 XHCI_EXT_PORT_PSIV(rhub->psi[i - 1])))
2112 rhub->psi_uid_count++;
2113
2114 xhci_dbg(xhci, "PSIV:%d PSIE:%d PLT:%d PFD:%d LP:%d PSIM:%d\n",
2115 XHCI_EXT_PORT_PSIV(rhub->psi[i]),
2116 XHCI_EXT_PORT_PSIE(rhub->psi[i]),
2117 XHCI_EXT_PORT_PLT(rhub->psi[i]),
2118 XHCI_EXT_PORT_PFD(rhub->psi[i]),
2119 XHCI_EXT_PORT_LP(rhub->psi[i]),
2120 XHCI_EXT_PORT_PSIM(rhub->psi[i]));
2121 }
2122 }
2123 /* cache usb2 port capabilities */
2124 if (major_revision < 0x03 && xhci->num_ext_caps < max_caps)
2125 xhci->ext_caps[xhci->num_ext_caps++] = temp;
2126
2127 /* Check the host's USB2 LPM capability */
2128 if ((xhci->hci_version == 0x96) && (major_revision != 0x03) &&
2129 (temp & XHCI_L1C)) {
2130 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2131 "xHCI 0.96: support USB2 software lpm");
2132 xhci->sw_lpm_support = 1;
2133 }
2134
2135 if ((xhci->hci_version >= 0x100) && (major_revision != 0x03)) {
2136 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2137 "xHCI 1.0: support USB2 software lpm");
2138 xhci->sw_lpm_support = 1;
2139 if (temp & XHCI_HLC) {
2140 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2141 "xHCI 1.0: support USB2 hardware lpm");
2142 xhci->hw_lpm_support = 1;
2143 }
2144 }
2145
2146 port_offset--;
2147 for (i = port_offset; i < (port_offset + port_count); i++) {
2148 /* Duplicate entry. Ignore the port if the revisions differ. */
2149 if (xhci->port_array[i] != 0) {
2150 xhci_warn(xhci, "Duplicate port entry, Ext Cap %p,"
2151 " port %u\n", addr, i);
2152 xhci_warn(xhci, "Port was marked as USB %u, "
2153 "duplicated as USB %u\n",
2154 xhci->port_array[i], major_revision);
2155 /* Only adjust the roothub port counts if we haven't
2156 * found a similar duplicate.
2157 */
2158 if (xhci->port_array[i] != major_revision &&
2159 xhci->port_array[i] != DUPLICATE_ENTRY) {
2160 if (xhci->port_array[i] == 0x03)
2161 xhci->num_usb3_ports--;
2162 else
2163 xhci->num_usb2_ports--;
2164 xhci->port_array[i] = DUPLICATE_ENTRY;
2165 }
2166 /* FIXME: Should we disable the port? */
2167 continue;
2168 }
2169 xhci->port_array[i] = major_revision;
2170 if (major_revision == 0x03)
2171 xhci->num_usb3_ports++;
2172 else
2173 xhci->num_usb2_ports++;
2174 }
2175 /* FIXME: Should we disable ports not in the Extended Capabilities? */
2176}
2177
2178/*
2179 * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that
2180 * specify what speeds each port is supposed to be. We can't count on the port
2181 * speed bits in the PORTSC register being correct until a device is connected,
2182 * but we need to set up the two fake roothubs with the correct number of USB
2183 * 3.0 and USB 2.0 ports at host controller initialization time.
2184 */
2185static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
2186{
2187 void __iomem *base;
2188 u32 offset;
2189 unsigned int num_ports;
2190 int i, j, port_index;
2191 int cap_count = 0;
2192 u32 cap_start;
2193
2194 num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
2195 xhci->port_array = kzalloc(sizeof(*xhci->port_array)*num_ports, flags);
2196 if (!xhci->port_array)
2197 return -ENOMEM;
2198
2199 xhci->rh_bw = kzalloc(sizeof(*xhci->rh_bw)*num_ports, flags);
2200 if (!xhci->rh_bw)
2201 return -ENOMEM;
2202 for (i = 0; i < num_ports; i++) {
2203 struct xhci_interval_bw_table *bw_table;
2204
2205 INIT_LIST_HEAD(&xhci->rh_bw[i].tts);
2206 bw_table = &xhci->rh_bw[i].bw_table;
2207 for (j = 0; j < XHCI_MAX_INTERVAL; j++)
2208 INIT_LIST_HEAD(&bw_table->interval_bw[j].endpoints);
2209 }
2210 base = &xhci->cap_regs->hc_capbase;
2211
2212 cap_start = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_PROTOCOL);
2213 if (!cap_start) {
2214 xhci_err(xhci, "No Extended Capability registers, unable to set up roothub\n");
2215 return -ENODEV;
2216 }
2217
2218 offset = cap_start;
2219 /* count extended protocol capability entries for later caching */
2220 while (offset) {
2221 cap_count++;
2222 offset = xhci_find_next_ext_cap(base, offset,
2223 XHCI_EXT_CAPS_PROTOCOL);
2224 }
2225
2226 xhci->ext_caps = kzalloc(sizeof(*xhci->ext_caps) * cap_count, flags);
2227 if (!xhci->ext_caps)
2228 return -ENOMEM;
2229
2230 offset = cap_start;
2231
2232 while (offset) {
2233 xhci_add_in_port(xhci, num_ports, base + offset, cap_count);
2234 if (xhci->num_usb2_ports + xhci->num_usb3_ports == num_ports)
2235 break;
2236 offset = xhci_find_next_ext_cap(base, offset,
2237 XHCI_EXT_CAPS_PROTOCOL);
2238 }
2239
2240 if (xhci->num_usb2_ports == 0 && xhci->num_usb3_ports == 0) {
2241 xhci_warn(xhci, "No ports on the roothubs?\n");
2242 return -ENODEV;
2243 }
2244 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2245 "Found %u USB 2.0 ports and %u USB 3.0 ports.",
2246 xhci->num_usb2_ports, xhci->num_usb3_ports);
2247
2248 /* Place limits on the number of roothub ports so that the hub
2249 * descriptors aren't longer than the USB core will allocate.
2250 */
2251 if (xhci->num_usb3_ports > 15) {
2252 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2253 "Limiting USB 3.0 roothub ports to 15.");
2254 xhci->num_usb3_ports = 15;
2255 }
2256 if (xhci->num_usb2_ports > USB_MAXCHILDREN) {
2257 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2258 "Limiting USB 2.0 roothub ports to %u.",
2259 USB_MAXCHILDREN);
2260 xhci->num_usb2_ports = USB_MAXCHILDREN;
2261 }
2262
2263 /*
2264 * Note we could have all USB 3.0 ports, or all USB 2.0 ports.
2265 * Not sure how the USB core will handle a hub with no ports...
2266 */
2267 if (xhci->num_usb2_ports) {
2268 xhci->usb2_ports = kmalloc(sizeof(*xhci->usb2_ports)*
2269 xhci->num_usb2_ports, flags);
2270 if (!xhci->usb2_ports)
2271 return -ENOMEM;
2272
2273 port_index = 0;
2274 for (i = 0; i < num_ports; i++) {
2275 if (xhci->port_array[i] == 0x03 ||
2276 xhci->port_array[i] == 0 ||
2277 xhci->port_array[i] == DUPLICATE_ENTRY)
2278 continue;
2279
2280 xhci->usb2_ports[port_index] =
2281 &xhci->op_regs->port_status_base +
2282 NUM_PORT_REGS*i;
2283 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2284 "USB 2.0 port at index %u, "
2285 "addr = %p", i,
2286 xhci->usb2_ports[port_index]);
2287 port_index++;
2288 if (port_index == xhci->num_usb2_ports)
2289 break;
2290 }
2291 }
2292 if (xhci->num_usb3_ports) {
2293 xhci->usb3_ports = kmalloc(sizeof(*xhci->usb3_ports)*
2294 xhci->num_usb3_ports, flags);
2295 if (!xhci->usb3_ports)
2296 return -ENOMEM;
2297
2298 port_index = 0;
2299 for (i = 0; i < num_ports; i++)
2300 if (xhci->port_array[i] == 0x03) {
2301 xhci->usb3_ports[port_index] =
2302 &xhci->op_regs->port_status_base +
2303 NUM_PORT_REGS*i;
2304 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2305 "USB 3.0 port at index %u, "
2306 "addr = %p", i,
2307 xhci->usb3_ports[port_index]);
2308 port_index++;
2309 if (port_index == xhci->num_usb3_ports)
2310 break;
2311 }
2312 }
2313 return 0;
2314}
2315
2316int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
2317{
2318 dma_addr_t dma;
2319 struct device *dev = xhci_to_hcd(xhci)->self.controller;
2320 unsigned int val, val2;
2321 u64 val_64;
2322 struct xhci_segment *seg;
2323 u32 page_size, temp;
2324 int i;
2325
2326 INIT_LIST_HEAD(&xhci->cmd_list);
2327
2328 /* init command timeout timer */
2329 setup_timer(&xhci->cmd_timer, xhci_handle_command_timeout,
2330 (unsigned long)xhci);
2331
2332 page_size = readl(&xhci->op_regs->page_size);
2333 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2334 "Supported page size register = 0x%x", page_size);
2335 for (i = 0; i < 16; i++) {
2336 if ((0x1 & page_size) != 0)
2337 break;
2338 page_size = page_size >> 1;
2339 }
2340 if (i < 16)
2341 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2342 "Supported page size of %iK", (1 << (i+12)) / 1024);
2343 else
2344 xhci_warn(xhci, "WARN: no supported page size\n");
2345 /* Use 4K pages, since that's common and the minimum the HC supports */
2346 xhci->page_shift = 12;
2347 xhci->page_size = 1 << xhci->page_shift;
2348 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2349 "HCD page size set to %iK", xhci->page_size / 1024);
2350
2351 /*
2352 * Program the Number of Device Slots Enabled field in the CONFIG
2353 * register with the max value of slots the HC can handle.
2354 */
2355 val = HCS_MAX_SLOTS(readl(&xhci->cap_regs->hcs_params1));
2356 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2357 "// xHC can handle at most %d device slots.", val);
2358 val2 = readl(&xhci->op_regs->config_reg);
2359 val |= (val2 & ~HCS_SLOTS_MASK);
2360 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2361 "// Setting Max device slots reg = 0x%x.", val);
2362 writel(val, &xhci->op_regs->config_reg);
2363
2364 /*
2365 * Section 5.4.8 - doorbell array must be
2366 * "physically contiguous and 64-byte (cache line) aligned".
2367 */
2368 xhci->dcbaa = dma_alloc_coherent(dev, sizeof(*xhci->dcbaa), &dma,
2369 GFP_KERNEL);
2370 if (!xhci->dcbaa)
2371 goto fail;
2372 memset(xhci->dcbaa, 0, sizeof *(xhci->dcbaa));
2373 xhci->dcbaa->dma = dma;
2374 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2375 "// Device context base array address = 0x%llx (DMA), %p (virt)",
2376 (unsigned long long)xhci->dcbaa->dma, xhci->dcbaa);
2377 xhci_write_64(xhci, dma, &xhci->op_regs->dcbaa_ptr);
2378
2379 /*
2380 * Initialize the ring segment pool. The ring must be a contiguous
2381 * structure comprised of TRBs. The TRBs must be 16 byte aligned,
2382 * however, the command ring segment needs 64-byte aligned segments
2383 * and our use of dma addresses in the trb_address_map radix tree needs
2384 * TRB_SEGMENT_SIZE alignment, so we pick the greater alignment need.
2385 */
2386 xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
2387 TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size);
2388
2389 /* See Table 46 and Note on Figure 55 */
2390 xhci->device_pool = dma_pool_create("xHCI input/output contexts", dev,
2391 2112, 64, xhci->page_size);
2392 if (!xhci->segment_pool || !xhci->device_pool)
2393 goto fail;
2394
2395 /* Linear stream context arrays don't have any boundary restrictions,
2396 * and only need to be 16-byte aligned.
2397 */
2398 xhci->small_streams_pool =
2399 dma_pool_create("xHCI 256 byte stream ctx arrays",
2400 dev, SMALL_STREAM_ARRAY_SIZE, 16, 0);
2401 xhci->medium_streams_pool =
2402 dma_pool_create("xHCI 1KB stream ctx arrays",
2403 dev, MEDIUM_STREAM_ARRAY_SIZE, 16, 0);
2404 /* Any stream context array bigger than MEDIUM_STREAM_ARRAY_SIZE
2405 * will be allocated with dma_alloc_coherent()
2406 */
2407
2408 if (!xhci->small_streams_pool || !xhci->medium_streams_pool)
2409 goto fail;
2410
2411 /* Set up the command ring to have one segments for now. */
2412 xhci->cmd_ring = xhci_ring_alloc(xhci, 1, 1, TYPE_COMMAND, flags);
2413 if (!xhci->cmd_ring)
2414 goto fail;
2415 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2416 "Allocated command ring at %p", xhci->cmd_ring);
2417 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "First segment DMA is 0x%llx",
2418 (unsigned long long)xhci->cmd_ring->first_seg->dma);
2419
2420 /* Set the address in the Command Ring Control register */
2421 val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
2422 val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
2423 (xhci->cmd_ring->first_seg->dma & (u64) ~CMD_RING_RSVD_BITS) |
2424 xhci->cmd_ring->cycle_state;
2425 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2426 "// Setting command ring address to 0x%x", val);
2427 xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
2428 xhci_dbg_cmd_ptrs(xhci);
2429
2430 xhci->lpm_command = xhci_alloc_command(xhci, true, true, flags);
2431 if (!xhci->lpm_command)
2432 goto fail;
2433
2434 /* Reserve one command ring TRB for disabling LPM.
2435 * Since the USB core grabs the shared usb_bus bandwidth mutex before
2436 * disabling LPM, we only need to reserve one TRB for all devices.
2437 */
2438 xhci->cmd_ring_reserved_trbs++;
2439
2440 val = readl(&xhci->cap_regs->db_off);
2441 val &= DBOFF_MASK;
2442 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2443 "// Doorbell array is located at offset 0x%x"
2444 " from cap regs base addr", val);
2445 xhci->dba = (void __iomem *) xhci->cap_regs + val;
2446 xhci_dbg_regs(xhci);
2447 xhci_print_run_regs(xhci);
2448 /* Set ir_set to interrupt register set 0 */
2449 xhci->ir_set = &xhci->run_regs->ir_set[0];
2450
2451 /*
2452 * Event ring setup: Allocate a normal ring, but also setup
2453 * the event ring segment table (ERST). Section 4.9.3.
2454 */
2455 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring");
2456 xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT,
2457 flags);
2458 if (!xhci->event_ring)
2459 goto fail;
2460 if (xhci_check_trb_in_td_math(xhci) < 0)
2461 goto fail;
2462
2463 xhci->erst.entries = dma_alloc_coherent(dev,
2464 sizeof(struct xhci_erst_entry) * ERST_NUM_SEGS, &dma,
2465 GFP_KERNEL);
2466 if (!xhci->erst.entries)
2467 goto fail;
2468 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2469 "// Allocated event ring segment table at 0x%llx",
2470 (unsigned long long)dma);
2471
2472 memset(xhci->erst.entries, 0, sizeof(struct xhci_erst_entry)*ERST_NUM_SEGS);
2473 xhci->erst.num_entries = ERST_NUM_SEGS;
2474 xhci->erst.erst_dma_addr = dma;
2475 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2476 "Set ERST to 0; private num segs = %i, virt addr = %p, dma addr = 0x%llx",
2477 xhci->erst.num_entries,
2478 xhci->erst.entries,
2479 (unsigned long long)xhci->erst.erst_dma_addr);
2480
2481 /* set ring base address and size for each segment table entry */
2482 for (val = 0, seg = xhci->event_ring->first_seg; val < ERST_NUM_SEGS; val++) {
2483 struct xhci_erst_entry *entry = &xhci->erst.entries[val];
2484 entry->seg_addr = cpu_to_le64(seg->dma);
2485 entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT);
2486 entry->rsvd = 0;
2487 seg = seg->next;
2488 }
2489
2490 /* set ERST count with the number of entries in the segment table */
2491 val = readl(&xhci->ir_set->erst_size);
2492 val &= ERST_SIZE_MASK;
2493 val |= ERST_NUM_SEGS;
2494 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2495 "// Write ERST size = %i to ir_set 0 (some bits preserved)",
2496 val);
2497 writel(val, &xhci->ir_set->erst_size);
2498
2499 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2500 "// Set ERST entries to point to event ring.");
2501 /* set the segment table base address */
2502 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2503 "// Set ERST base address for ir_set 0 = 0x%llx",
2504 (unsigned long long)xhci->erst.erst_dma_addr);
2505 val_64 = xhci_read_64(xhci, &xhci->ir_set->erst_base);
2506 val_64 &= ERST_PTR_MASK;
2507 val_64 |= (xhci->erst.erst_dma_addr & (u64) ~ERST_PTR_MASK);
2508 xhci_write_64(xhci, val_64, &xhci->ir_set->erst_base);
2509
2510 /* Set the event ring dequeue address */
2511 xhci_set_hc_event_deq(xhci);
2512 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
2513 "Wrote ERST address to ir_set 0.");
2514 xhci_print_ir_set(xhci, 0);
2515
2516 /*
2517 * XXX: Might need to set the Interrupter Moderation Register to
2518 * something other than the default (~1ms minimum between interrupts).
2519 * See section 5.5.1.2.
2520 */
2521 init_completion(&xhci->addr_dev);
2522 for (i = 0; i < MAX_HC_SLOTS; ++i)
2523 xhci->devs[i] = NULL;
2524 for (i = 0; i < USB_MAXCHILDREN; ++i) {
2525 xhci->bus_state[0].resume_done[i] = 0;
2526 xhci->bus_state[1].resume_done[i] = 0;
2527 /* Only the USB 2.0 completions will ever be used. */
2528 init_completion(&xhci->bus_state[1].rexit_done[i]);
2529 }
2530
2531 if (scratchpad_alloc(xhci, flags))
2532 goto fail;
2533 if (xhci_setup_port_arrays(xhci, flags))
2534 goto fail;
2535
2536 /* Enable USB 3.0 device notifications for function remote wake, which
2537 * is necessary for allowing USB 3.0 devices to do remote wakeup from
2538 * U3 (device suspend).
2539 */
2540 temp = readl(&xhci->op_regs->dev_notification);
2541 temp &= ~DEV_NOTE_MASK;
2542 temp |= DEV_NOTE_FWAKE;
2543 writel(temp, &xhci->op_regs->dev_notification);
2544
2545 return 0;
2546
2547fail:
2548 xhci_warn(xhci, "Couldn't initialize memory\n");
2549 xhci_halt(xhci);
2550 xhci_reset(xhci);
2551 xhci_mem_cleanup(xhci);
2552 return -ENOMEM;
2553}