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7f84eef0 SS |
1 | /* |
2 | * xHCI host controller driver | |
3 | * | |
4 | * Copyright (C) 2008 Intel Corp. | |
5 | * | |
6 | * Author: Sarah Sharp | |
7 | * Some code borrowed from the Linux EHCI driver. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
15 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | * for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software Foundation, | |
20 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Ring initialization rules: | |
25 | * 1. Each segment is initialized to zero, except for link TRBs. | |
26 | * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or | |
27 | * Consumer Cycle State (CCS), depending on ring function. | |
28 | * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment. | |
29 | * | |
30 | * Ring behavior rules: | |
31 | * 1. A ring is empty if enqueue == dequeue. This means there will always be at | |
32 | * least one free TRB in the ring. This is useful if you want to turn that | |
33 | * into a link TRB and expand the ring. | |
34 | * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a | |
35 | * link TRB, then load the pointer with the address in the link TRB. If the | |
36 | * link TRB had its toggle bit set, you may need to update the ring cycle | |
37 | * state (see cycle bit rules). You may have to do this multiple times | |
38 | * until you reach a non-link TRB. | |
39 | * 3. A ring is full if enqueue++ (for the definition of increment above) | |
40 | * equals the dequeue pointer. | |
41 | * | |
42 | * Cycle bit rules: | |
43 | * 1. When a consumer increments a dequeue pointer and encounters a toggle bit | |
44 | * in a link TRB, it must toggle the ring cycle state. | |
45 | * 2. When a producer increments an enqueue pointer and encounters a toggle bit | |
46 | * in a link TRB, it must toggle the ring cycle state. | |
47 | * | |
48 | * Producer rules: | |
49 | * 1. Check if ring is full before you enqueue. | |
50 | * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing. | |
51 | * Update enqueue pointer between each write (which may update the ring | |
52 | * cycle state). | |
53 | * 3. Notify consumer. If SW is producer, it rings the doorbell for command | |
54 | * and endpoint rings. If HC is the producer for the event ring, | |
55 | * and it generates an interrupt according to interrupt modulation rules. | |
56 | * | |
57 | * Consumer rules: | |
58 | * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state, | |
59 | * the TRB is owned by the consumer. | |
60 | * 2. Update dequeue pointer (which may update the ring cycle state) and | |
61 | * continue processing TRBs until you reach a TRB which is not owned by you. | |
62 | * 3. Notify the producer. SW is the consumer for the event ring, and it | |
63 | * updates event ring dequeue pointer. HC is the consumer for the command and | |
64 | * endpoint rings; it generates events on the event ring for these. | |
65 | */ | |
66 | ||
8a96c052 | 67 | #include <linux/scatterlist.h> |
7f84eef0 SS |
68 | #include "xhci.h" |
69 | ||
70 | /* | |
71 | * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA | |
72 | * address of the TRB. | |
73 | */ | |
23e3be11 | 74 | dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, |
7f84eef0 SS |
75 | union xhci_trb *trb) |
76 | { | |
6071d836 | 77 | unsigned long segment_offset; |
7f84eef0 | 78 | |
6071d836 | 79 | if (!seg || !trb || trb < seg->trbs) |
7f84eef0 | 80 | return 0; |
6071d836 SS |
81 | /* offset in TRBs */ |
82 | segment_offset = trb - seg->trbs; | |
83 | if (segment_offset > TRBS_PER_SEGMENT) | |
7f84eef0 | 84 | return 0; |
6071d836 | 85 | return seg->dma + (segment_offset * sizeof(*trb)); |
7f84eef0 SS |
86 | } |
87 | ||
88 | /* Does this link TRB point to the first segment in a ring, | |
89 | * or was the previous TRB the last TRB on the last segment in the ERST? | |
90 | */ | |
91 | static inline bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
92 | struct xhci_segment *seg, union xhci_trb *trb) | |
93 | { | |
94 | if (ring == xhci->event_ring) | |
95 | return (trb == &seg->trbs[TRBS_PER_SEGMENT]) && | |
96 | (seg->next == xhci->event_ring->first_seg); | |
97 | else | |
98 | return trb->link.control & LINK_TOGGLE; | |
99 | } | |
100 | ||
101 | /* Is this TRB a link TRB or was the last TRB the last TRB in this event ring | |
102 | * segment? I.e. would the updated event TRB pointer step off the end of the | |
103 | * event seg? | |
104 | */ | |
105 | static inline int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
106 | struct xhci_segment *seg, union xhci_trb *trb) | |
107 | { | |
108 | if (ring == xhci->event_ring) | |
109 | return trb == &seg->trbs[TRBS_PER_SEGMENT]; | |
110 | else | |
111 | return (trb->link.control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK); | |
112 | } | |
113 | ||
ae636747 SS |
114 | /* Updates trb to point to the next TRB in the ring, and updates seg if the next |
115 | * TRB is in a new segment. This does not skip over link TRBs, and it does not | |
116 | * effect the ring dequeue or enqueue pointers. | |
117 | */ | |
118 | static void next_trb(struct xhci_hcd *xhci, | |
119 | struct xhci_ring *ring, | |
120 | struct xhci_segment **seg, | |
121 | union xhci_trb **trb) | |
122 | { | |
123 | if (last_trb(xhci, ring, *seg, *trb)) { | |
124 | *seg = (*seg)->next; | |
125 | *trb = ((*seg)->trbs); | |
126 | } else { | |
127 | *trb = (*trb)++; | |
128 | } | |
129 | } | |
130 | ||
7f84eef0 SS |
131 | /* |
132 | * See Cycle bit rules. SW is the consumer for the event ring only. | |
133 | * Don't make a ring full of link TRBs. That would be dumb and this would loop. | |
134 | */ | |
135 | static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer) | |
136 | { | |
137 | union xhci_trb *next = ++(ring->dequeue); | |
66e49d87 | 138 | unsigned long long addr; |
7f84eef0 SS |
139 | |
140 | ring->deq_updates++; | |
141 | /* Update the dequeue pointer further if that was a link TRB or we're at | |
142 | * the end of an event ring segment (which doesn't have link TRBS) | |
143 | */ | |
144 | while (last_trb(xhci, ring, ring->deq_seg, next)) { | |
145 | if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) { | |
146 | ring->cycle_state = (ring->cycle_state ? 0 : 1); | |
147 | if (!in_interrupt()) | |
700e2052 GKH |
148 | xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n", |
149 | ring, | |
7f84eef0 SS |
150 | (unsigned int) ring->cycle_state); |
151 | } | |
152 | ring->deq_seg = ring->deq_seg->next; | |
153 | ring->dequeue = ring->deq_seg->trbs; | |
154 | next = ring->dequeue; | |
155 | } | |
66e49d87 SS |
156 | addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue); |
157 | if (ring == xhci->event_ring) | |
158 | xhci_dbg(xhci, "Event ring deq = 0x%llx (DMA)\n", addr); | |
159 | else if (ring == xhci->cmd_ring) | |
160 | xhci_dbg(xhci, "Command ring deq = 0x%llx (DMA)\n", addr); | |
161 | else | |
162 | xhci_dbg(xhci, "Ring deq = 0x%llx (DMA)\n", addr); | |
7f84eef0 SS |
163 | } |
164 | ||
165 | /* | |
166 | * See Cycle bit rules. SW is the consumer for the event ring only. | |
167 | * Don't make a ring full of link TRBs. That would be dumb and this would loop. | |
168 | * | |
169 | * If we've just enqueued a TRB that is in the middle of a TD (meaning the | |
170 | * chain bit is set), then set the chain bit in all the following link TRBs. | |
171 | * If we've enqueued the last TRB in a TD, make sure the following link TRBs | |
172 | * have their chain bit cleared (so that each Link TRB is a separate TD). | |
173 | * | |
174 | * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit | |
b0567b3f SS |
175 | * set, but other sections talk about dealing with the chain bit set. This was |
176 | * fixed in the 0.96 specification errata, but we have to assume that all 0.95 | |
177 | * xHCI hardware can't handle the chain bit being cleared on a link TRB. | |
7f84eef0 SS |
178 | */ |
179 | static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer) | |
180 | { | |
181 | u32 chain; | |
182 | union xhci_trb *next; | |
66e49d87 | 183 | unsigned long long addr; |
7f84eef0 SS |
184 | |
185 | chain = ring->enqueue->generic.field[3] & TRB_CHAIN; | |
186 | next = ++(ring->enqueue); | |
187 | ||
188 | ring->enq_updates++; | |
189 | /* Update the dequeue pointer further if that was a link TRB or we're at | |
190 | * the end of an event ring segment (which doesn't have link TRBS) | |
191 | */ | |
192 | while (last_trb(xhci, ring, ring->enq_seg, next)) { | |
193 | if (!consumer) { | |
194 | if (ring != xhci->event_ring) { | |
b0567b3f SS |
195 | /* If we're not dealing with 0.95 hardware, |
196 | * carry over the chain bit of the previous TRB | |
197 | * (which may mean the chain bit is cleared). | |
198 | */ | |
199 | if (!xhci_link_trb_quirk(xhci)) { | |
200 | next->link.control &= ~TRB_CHAIN; | |
201 | next->link.control |= chain; | |
202 | } | |
7f84eef0 | 203 | /* Give this link TRB to the hardware */ |
b7116ebc | 204 | wmb(); |
7f84eef0 SS |
205 | if (next->link.control & TRB_CYCLE) |
206 | next->link.control &= (u32) ~TRB_CYCLE; | |
207 | else | |
208 | next->link.control |= (u32) TRB_CYCLE; | |
7f84eef0 SS |
209 | } |
210 | /* Toggle the cycle bit after the last ring segment. */ | |
211 | if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) { | |
212 | ring->cycle_state = (ring->cycle_state ? 0 : 1); | |
213 | if (!in_interrupt()) | |
700e2052 GKH |
214 | xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n", |
215 | ring, | |
7f84eef0 SS |
216 | (unsigned int) ring->cycle_state); |
217 | } | |
218 | } | |
219 | ring->enq_seg = ring->enq_seg->next; | |
220 | ring->enqueue = ring->enq_seg->trbs; | |
221 | next = ring->enqueue; | |
222 | } | |
66e49d87 SS |
223 | addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue); |
224 | if (ring == xhci->event_ring) | |
225 | xhci_dbg(xhci, "Event ring enq = 0x%llx (DMA)\n", addr); | |
226 | else if (ring == xhci->cmd_ring) | |
227 | xhci_dbg(xhci, "Command ring enq = 0x%llx (DMA)\n", addr); | |
228 | else | |
229 | xhci_dbg(xhci, "Ring enq = 0x%llx (DMA)\n", addr); | |
7f84eef0 SS |
230 | } |
231 | ||
232 | /* | |
233 | * Check to see if there's room to enqueue num_trbs on the ring. See rules | |
234 | * above. | |
235 | * FIXME: this would be simpler and faster if we just kept track of the number | |
236 | * of free TRBs in a ring. | |
237 | */ | |
238 | static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
239 | unsigned int num_trbs) | |
240 | { | |
241 | int i; | |
242 | union xhci_trb *enq = ring->enqueue; | |
243 | struct xhci_segment *enq_seg = ring->enq_seg; | |
244 | ||
245 | /* Check if ring is empty */ | |
246 | if (enq == ring->dequeue) | |
247 | return 1; | |
248 | /* Make sure there's an extra empty TRB available */ | |
249 | for (i = 0; i <= num_trbs; ++i) { | |
250 | if (enq == ring->dequeue) | |
251 | return 0; | |
252 | enq++; | |
253 | while (last_trb(xhci, ring, enq_seg, enq)) { | |
254 | enq_seg = enq_seg->next; | |
255 | enq = enq_seg->trbs; | |
256 | } | |
257 | } | |
258 | return 1; | |
259 | } | |
260 | ||
23e3be11 | 261 | void xhci_set_hc_event_deq(struct xhci_hcd *xhci) |
7f84eef0 | 262 | { |
8e595a5d | 263 | u64 temp; |
7f84eef0 SS |
264 | dma_addr_t deq; |
265 | ||
23e3be11 | 266 | deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, |
7f84eef0 SS |
267 | xhci->event_ring->dequeue); |
268 | if (deq == 0 && !in_interrupt()) | |
269 | xhci_warn(xhci, "WARN something wrong with SW event ring " | |
270 | "dequeue ptr.\n"); | |
271 | /* Update HC event ring dequeue pointer */ | |
8e595a5d | 272 | temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); |
7f84eef0 | 273 | temp &= ERST_PTR_MASK; |
2d83109b SS |
274 | /* Don't clear the EHB bit (which is RW1C) because |
275 | * there might be more events to service. | |
276 | */ | |
277 | temp &= ~ERST_EHB; | |
66e49d87 | 278 | xhci_dbg(xhci, "// Write event ring dequeue pointer, preserving EHB bit\n"); |
8e595a5d SS |
279 | xhci_write_64(xhci, ((u64) deq & (u64) ~ERST_PTR_MASK) | temp, |
280 | &xhci->ir_set->erst_dequeue); | |
7f84eef0 SS |
281 | } |
282 | ||
283 | /* Ring the host controller doorbell after placing a command on the ring */ | |
23e3be11 | 284 | void xhci_ring_cmd_db(struct xhci_hcd *xhci) |
7f84eef0 SS |
285 | { |
286 | u32 temp; | |
287 | ||
288 | xhci_dbg(xhci, "// Ding dong!\n"); | |
289 | temp = xhci_readl(xhci, &xhci->dba->doorbell[0]) & DB_MASK; | |
290 | xhci_writel(xhci, temp | DB_TARGET_HOST, &xhci->dba->doorbell[0]); | |
291 | /* Flush PCI posted writes */ | |
292 | xhci_readl(xhci, &xhci->dba->doorbell[0]); | |
293 | } | |
294 | ||
ae636747 SS |
295 | static void ring_ep_doorbell(struct xhci_hcd *xhci, |
296 | unsigned int slot_id, | |
297 | unsigned int ep_index) | |
298 | { | |
63a0d9ab SS |
299 | struct xhci_virt_ep *ep; |
300 | unsigned int ep_state; | |
ae636747 SS |
301 | u32 field; |
302 | __u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id]; | |
303 | ||
63a0d9ab SS |
304 | ep = &xhci->devs[slot_id]->eps[ep_index]; |
305 | ep_state = ep->ep_state; | |
ae636747 SS |
306 | /* Don't ring the doorbell for this endpoint if there are pending |
307 | * cancellations because the we don't want to interrupt processing. | |
308 | */ | |
63a0d9ab SS |
309 | if (!ep->cancels_pending && !(ep_state & SET_DEQ_PENDING) |
310 | && !(ep_state & EP_HALTED)) { | |
ae636747 SS |
311 | field = xhci_readl(xhci, db_addr) & DB_MASK; |
312 | xhci_writel(xhci, field | EPI_TO_DB(ep_index), db_addr); | |
313 | /* Flush PCI posted writes - FIXME Matthew Wilcox says this | |
314 | * isn't time-critical and we shouldn't make the CPU wait for | |
315 | * the flush. | |
316 | */ | |
317 | xhci_readl(xhci, db_addr); | |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
322 | * Find the segment that trb is in. Start searching in start_seg. | |
323 | * If we must move past a segment that has a link TRB with a toggle cycle state | |
324 | * bit set, then we will toggle the value pointed at by cycle_state. | |
325 | */ | |
326 | static struct xhci_segment *find_trb_seg( | |
327 | struct xhci_segment *start_seg, | |
328 | union xhci_trb *trb, int *cycle_state) | |
329 | { | |
330 | struct xhci_segment *cur_seg = start_seg; | |
331 | struct xhci_generic_trb *generic_trb; | |
332 | ||
333 | while (cur_seg->trbs > trb || | |
334 | &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) { | |
335 | generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic; | |
336 | if (TRB_TYPE(generic_trb->field[3]) == TRB_LINK && | |
337 | (generic_trb->field[3] & LINK_TOGGLE)) | |
338 | *cycle_state = ~(*cycle_state) & 0x1; | |
339 | cur_seg = cur_seg->next; | |
340 | if (cur_seg == start_seg) | |
341 | /* Looped over the entire list. Oops! */ | |
342 | return 0; | |
343 | } | |
344 | return cur_seg; | |
345 | } | |
346 | ||
ae636747 SS |
347 | /* |
348 | * Move the xHC's endpoint ring dequeue pointer past cur_td. | |
349 | * Record the new state of the xHC's endpoint ring dequeue segment, | |
350 | * dequeue pointer, and new consumer cycle state in state. | |
351 | * Update our internal representation of the ring's dequeue pointer. | |
352 | * | |
353 | * We do this in three jumps: | |
354 | * - First we update our new ring state to be the same as when the xHC stopped. | |
355 | * - Then we traverse the ring to find the segment that contains | |
356 | * the last TRB in the TD. We toggle the xHC's new cycle state when we pass | |
357 | * any link TRBs with the toggle cycle bit set. | |
358 | * - Finally we move the dequeue state one TRB further, toggling the cycle bit | |
359 | * if we've moved it past a link TRB with the toggle cycle bit set. | |
360 | */ | |
c92bcfa7 | 361 | void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, |
ae636747 | 362 | unsigned int slot_id, unsigned int ep_index, |
c92bcfa7 | 363 | struct xhci_td *cur_td, struct xhci_dequeue_state *state) |
ae636747 SS |
364 | { |
365 | struct xhci_virt_device *dev = xhci->devs[slot_id]; | |
63a0d9ab | 366 | struct xhci_ring *ep_ring = dev->eps[ep_index].ring; |
ae636747 | 367 | struct xhci_generic_trb *trb; |
d115b048 | 368 | struct xhci_ep_ctx *ep_ctx; |
c92bcfa7 | 369 | dma_addr_t addr; |
ae636747 SS |
370 | |
371 | state->new_cycle_state = 0; | |
c92bcfa7 | 372 | xhci_dbg(xhci, "Finding segment containing stopped TRB.\n"); |
ae636747 | 373 | state->new_deq_seg = find_trb_seg(cur_td->start_seg, |
63a0d9ab | 374 | dev->eps[ep_index].stopped_trb, |
ae636747 SS |
375 | &state->new_cycle_state); |
376 | if (!state->new_deq_seg) | |
377 | BUG(); | |
378 | /* Dig out the cycle state saved by the xHC during the stop ep cmd */ | |
c92bcfa7 | 379 | xhci_dbg(xhci, "Finding endpoint context\n"); |
d115b048 JY |
380 | ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
381 | state->new_cycle_state = 0x1 & ep_ctx->deq; | |
ae636747 SS |
382 | |
383 | state->new_deq_ptr = cur_td->last_trb; | |
c92bcfa7 | 384 | xhci_dbg(xhci, "Finding segment containing last TRB in TD.\n"); |
ae636747 SS |
385 | state->new_deq_seg = find_trb_seg(state->new_deq_seg, |
386 | state->new_deq_ptr, | |
387 | &state->new_cycle_state); | |
388 | if (!state->new_deq_seg) | |
389 | BUG(); | |
390 | ||
391 | trb = &state->new_deq_ptr->generic; | |
392 | if (TRB_TYPE(trb->field[3]) == TRB_LINK && | |
393 | (trb->field[3] & LINK_TOGGLE)) | |
394 | state->new_cycle_state = ~(state->new_cycle_state) & 0x1; | |
395 | next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr); | |
396 | ||
397 | /* Don't update the ring cycle state for the producer (us). */ | |
c92bcfa7 SS |
398 | xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n", |
399 | state->new_deq_seg); | |
400 | addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr); | |
401 | xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n", | |
402 | (unsigned long long) addr); | |
403 | xhci_dbg(xhci, "Setting dequeue pointer in internal ring state.\n"); | |
ae636747 SS |
404 | ep_ring->dequeue = state->new_deq_ptr; |
405 | ep_ring->deq_seg = state->new_deq_seg; | |
406 | } | |
407 | ||
23e3be11 | 408 | static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, |
ae636747 SS |
409 | struct xhci_td *cur_td) |
410 | { | |
411 | struct xhci_segment *cur_seg; | |
412 | union xhci_trb *cur_trb; | |
413 | ||
414 | for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb; | |
415 | true; | |
416 | next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { | |
417 | if ((cur_trb->generic.field[3] & TRB_TYPE_BITMASK) == | |
418 | TRB_TYPE(TRB_LINK)) { | |
419 | /* Unchain any chained Link TRBs, but | |
420 | * leave the pointers intact. | |
421 | */ | |
422 | cur_trb->generic.field[3] &= ~TRB_CHAIN; | |
423 | xhci_dbg(xhci, "Cancel (unchain) link TRB\n"); | |
700e2052 GKH |
424 | xhci_dbg(xhci, "Address = %p (0x%llx dma); " |
425 | "in seg %p (0x%llx dma)\n", | |
426 | cur_trb, | |
23e3be11 | 427 | (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), |
700e2052 GKH |
428 | cur_seg, |
429 | (unsigned long long)cur_seg->dma); | |
ae636747 SS |
430 | } else { |
431 | cur_trb->generic.field[0] = 0; | |
432 | cur_trb->generic.field[1] = 0; | |
433 | cur_trb->generic.field[2] = 0; | |
434 | /* Preserve only the cycle bit of this TRB */ | |
435 | cur_trb->generic.field[3] &= TRB_CYCLE; | |
436 | cur_trb->generic.field[3] |= TRB_TYPE(TRB_TR_NOOP); | |
700e2052 GKH |
437 | xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) " |
438 | "in seg %p (0x%llx dma)\n", | |
439 | cur_trb, | |
23e3be11 | 440 | (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb), |
700e2052 GKH |
441 | cur_seg, |
442 | (unsigned long long)cur_seg->dma); | |
ae636747 SS |
443 | } |
444 | if (cur_trb == cur_td->last_trb) | |
445 | break; | |
446 | } | |
447 | } | |
448 | ||
449 | static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, | |
450 | unsigned int ep_index, struct xhci_segment *deq_seg, | |
451 | union xhci_trb *deq_ptr, u32 cycle_state); | |
452 | ||
c92bcfa7 | 453 | void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci, |
63a0d9ab SS |
454 | unsigned int slot_id, unsigned int ep_index, |
455 | struct xhci_dequeue_state *deq_state) | |
c92bcfa7 | 456 | { |
63a0d9ab SS |
457 | struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; |
458 | ||
c92bcfa7 SS |
459 | xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), " |
460 | "new deq ptr = %p (0x%llx dma), new cycle = %u\n", | |
461 | deq_state->new_deq_seg, | |
462 | (unsigned long long)deq_state->new_deq_seg->dma, | |
463 | deq_state->new_deq_ptr, | |
464 | (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr), | |
465 | deq_state->new_cycle_state); | |
466 | queue_set_tr_deq(xhci, slot_id, ep_index, | |
467 | deq_state->new_deq_seg, | |
468 | deq_state->new_deq_ptr, | |
469 | (u32) deq_state->new_cycle_state); | |
470 | /* Stop the TD queueing code from ringing the doorbell until | |
471 | * this command completes. The HC won't set the dequeue pointer | |
472 | * if the ring is running, and ringing the doorbell starts the | |
473 | * ring running. | |
474 | */ | |
63a0d9ab | 475 | ep->ep_state |= SET_DEQ_PENDING; |
c92bcfa7 SS |
476 | } |
477 | ||
ae636747 SS |
478 | /* |
479 | * When we get a command completion for a Stop Endpoint Command, we need to | |
480 | * unlink any cancelled TDs from the ring. There are two ways to do that: | |
481 | * | |
482 | * 1. If the HW was in the middle of processing the TD that needs to be | |
483 | * cancelled, then we must move the ring's dequeue pointer past the last TRB | |
484 | * in the TD with a Set Dequeue Pointer Command. | |
485 | * 2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain | |
486 | * bit cleared) so that the HW will skip over them. | |
487 | */ | |
488 | static void handle_stopped_endpoint(struct xhci_hcd *xhci, | |
489 | union xhci_trb *trb) | |
490 | { | |
491 | unsigned int slot_id; | |
492 | unsigned int ep_index; | |
493 | struct xhci_ring *ep_ring; | |
63a0d9ab | 494 | struct xhci_virt_ep *ep; |
ae636747 SS |
495 | struct list_head *entry; |
496 | struct xhci_td *cur_td = 0; | |
497 | struct xhci_td *last_unlinked_td; | |
498 | ||
c92bcfa7 | 499 | struct xhci_dequeue_state deq_state; |
ae636747 SS |
500 | #ifdef CONFIG_USB_HCD_STAT |
501 | ktime_t stop_time = ktime_get(); | |
502 | #endif | |
503 | ||
504 | memset(&deq_state, 0, sizeof(deq_state)); | |
505 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
506 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
63a0d9ab SS |
507 | ep = &xhci->devs[slot_id]->eps[ep_index]; |
508 | ep_ring = ep->ring; | |
ae636747 | 509 | |
63a0d9ab | 510 | if (list_empty(&ep->cancelled_td_list)) |
ae636747 SS |
511 | return; |
512 | ||
513 | /* Fix up the ep ring first, so HW stops executing cancelled TDs. | |
514 | * We have the xHCI lock, so nothing can modify this list until we drop | |
515 | * it. We're also in the event handler, so we can't get re-interrupted | |
516 | * if another Stop Endpoint command completes | |
517 | */ | |
63a0d9ab | 518 | list_for_each(entry, &ep->cancelled_td_list) { |
ae636747 | 519 | cur_td = list_entry(entry, struct xhci_td, cancelled_td_list); |
700e2052 GKH |
520 | xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n", |
521 | cur_td->first_trb, | |
23e3be11 | 522 | (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb)); |
ae636747 SS |
523 | /* |
524 | * If we stopped on the TD we need to cancel, then we have to | |
525 | * move the xHC endpoint ring dequeue pointer past this TD. | |
526 | */ | |
63a0d9ab | 527 | if (cur_td == ep->stopped_td) |
c92bcfa7 | 528 | xhci_find_new_dequeue_state(xhci, slot_id, ep_index, cur_td, |
ae636747 SS |
529 | &deq_state); |
530 | else | |
531 | td_to_noop(xhci, ep_ring, cur_td); | |
532 | /* | |
533 | * The event handler won't see a completion for this TD anymore, | |
534 | * so remove it from the endpoint ring's TD list. Keep it in | |
535 | * the cancelled TD list for URB completion later. | |
536 | */ | |
537 | list_del(&cur_td->td_list); | |
63a0d9ab | 538 | ep->cancels_pending--; |
ae636747 SS |
539 | } |
540 | last_unlinked_td = cur_td; | |
541 | ||
542 | /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */ | |
543 | if (deq_state.new_deq_ptr && deq_state.new_deq_seg) { | |
63a0d9ab | 544 | xhci_queue_new_dequeue_state(xhci, |
c92bcfa7 | 545 | slot_id, ep_index, &deq_state); |
ac9d8fe7 | 546 | xhci_ring_cmd_db(xhci); |
ae636747 SS |
547 | } else { |
548 | /* Otherwise just ring the doorbell to restart the ring */ | |
549 | ring_ep_doorbell(xhci, slot_id, ep_index); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Drop the lock and complete the URBs in the cancelled TD list. | |
554 | * New TDs to be cancelled might be added to the end of the list before | |
555 | * we can complete all the URBs for the TDs we already unlinked. | |
556 | * So stop when we've completed the URB for the last TD we unlinked. | |
557 | */ | |
558 | do { | |
63a0d9ab | 559 | cur_td = list_entry(ep->cancelled_td_list.next, |
ae636747 SS |
560 | struct xhci_td, cancelled_td_list); |
561 | list_del(&cur_td->cancelled_td_list); | |
562 | ||
563 | /* Clean up the cancelled URB */ | |
564 | #ifdef CONFIG_USB_HCD_STAT | |
565 | hcd_stat_update(xhci->tp_stat, cur_td->urb->actual_length, | |
566 | ktime_sub(stop_time, cur_td->start_time)); | |
567 | #endif | |
568 | cur_td->urb->hcpriv = NULL; | |
569 | usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), cur_td->urb); | |
570 | ||
700e2052 | 571 | xhci_dbg(xhci, "Giveback cancelled URB %p\n", cur_td->urb); |
ae636747 SS |
572 | spin_unlock(&xhci->lock); |
573 | /* Doesn't matter what we pass for status, since the core will | |
574 | * just overwrite it (because the URB has been unlinked). | |
575 | */ | |
576 | usb_hcd_giveback_urb(xhci_to_hcd(xhci), cur_td->urb, 0); | |
577 | kfree(cur_td); | |
578 | ||
579 | spin_lock(&xhci->lock); | |
580 | } while (cur_td != last_unlinked_td); | |
581 | ||
582 | /* Return to the event handler with xhci->lock re-acquired */ | |
583 | } | |
584 | ||
585 | /* | |
586 | * When we get a completion for a Set Transfer Ring Dequeue Pointer command, | |
587 | * we need to clear the set deq pending flag in the endpoint ring state, so that | |
588 | * the TD queueing code can ring the doorbell again. We also need to ring the | |
589 | * endpoint doorbell to restart the ring, but only if there aren't more | |
590 | * cancellations pending. | |
591 | */ | |
592 | static void handle_set_deq_completion(struct xhci_hcd *xhci, | |
593 | struct xhci_event_cmd *event, | |
594 | union xhci_trb *trb) | |
595 | { | |
596 | unsigned int slot_id; | |
597 | unsigned int ep_index; | |
598 | struct xhci_ring *ep_ring; | |
599 | struct xhci_virt_device *dev; | |
d115b048 JY |
600 | struct xhci_ep_ctx *ep_ctx; |
601 | struct xhci_slot_ctx *slot_ctx; | |
ae636747 SS |
602 | |
603 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
604 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
605 | dev = xhci->devs[slot_id]; | |
63a0d9ab | 606 | ep_ring = dev->eps[ep_index].ring; |
d115b048 JY |
607 | ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index); |
608 | slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx); | |
ae636747 SS |
609 | |
610 | if (GET_COMP_CODE(event->status) != COMP_SUCCESS) { | |
611 | unsigned int ep_state; | |
612 | unsigned int slot_state; | |
613 | ||
614 | switch (GET_COMP_CODE(event->status)) { | |
615 | case COMP_TRB_ERR: | |
616 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because " | |
617 | "of stream ID configuration\n"); | |
618 | break; | |
619 | case COMP_CTX_STATE: | |
620 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due " | |
621 | "to incorrect slot or ep state.\n"); | |
d115b048 | 622 | ep_state = ep_ctx->ep_info; |
ae636747 | 623 | ep_state &= EP_STATE_MASK; |
d115b048 | 624 | slot_state = slot_ctx->dev_state; |
ae636747 SS |
625 | slot_state = GET_SLOT_STATE(slot_state); |
626 | xhci_dbg(xhci, "Slot state = %u, EP state = %u\n", | |
627 | slot_state, ep_state); | |
628 | break; | |
629 | case COMP_EBADSLT: | |
630 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because " | |
631 | "slot %u was not enabled.\n", slot_id); | |
632 | break; | |
633 | default: | |
634 | xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown " | |
635 | "completion code of %u.\n", | |
636 | GET_COMP_CODE(event->status)); | |
637 | break; | |
638 | } | |
639 | /* OK what do we do now? The endpoint state is hosed, and we | |
640 | * should never get to this point if the synchronization between | |
641 | * queueing, and endpoint state are correct. This might happen | |
642 | * if the device gets disconnected after we've finished | |
643 | * cancelling URBs, which might not be an error... | |
644 | */ | |
645 | } else { | |
8e595a5d | 646 | xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n", |
d115b048 | 647 | ep_ctx->deq); |
ae636747 SS |
648 | } |
649 | ||
63a0d9ab | 650 | dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING; |
ae636747 SS |
651 | ring_ep_doorbell(xhci, slot_id, ep_index); |
652 | } | |
653 | ||
a1587d97 SS |
654 | static void handle_reset_ep_completion(struct xhci_hcd *xhci, |
655 | struct xhci_event_cmd *event, | |
656 | union xhci_trb *trb) | |
657 | { | |
658 | int slot_id; | |
659 | unsigned int ep_index; | |
ac9d8fe7 | 660 | struct xhci_ring *ep_ring; |
a1587d97 SS |
661 | |
662 | slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]); | |
663 | ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]); | |
63a0d9ab | 664 | ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
a1587d97 SS |
665 | /* This command will only fail if the endpoint wasn't halted, |
666 | * but we don't care. | |
667 | */ | |
668 | xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n", | |
669 | (unsigned int) GET_COMP_CODE(event->status)); | |
670 | ||
ac9d8fe7 SS |
671 | /* HW with the reset endpoint quirk needs to have a configure endpoint |
672 | * command complete before the endpoint can be used. Queue that here | |
673 | * because the HW can't handle two commands being queued in a row. | |
674 | */ | |
675 | if (xhci->quirks & XHCI_RESET_EP_QUIRK) { | |
676 | xhci_dbg(xhci, "Queueing configure endpoint command\n"); | |
677 | xhci_queue_configure_endpoint(xhci, | |
678 | xhci->devs[slot_id]->in_ctx->dma, slot_id); | |
679 | xhci_ring_cmd_db(xhci); | |
680 | } else { | |
681 | /* Clear our internal halted state and restart the ring */ | |
63a0d9ab | 682 | xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED; |
ac9d8fe7 SS |
683 | ring_ep_doorbell(xhci, slot_id, ep_index); |
684 | } | |
a1587d97 | 685 | } |
ae636747 | 686 | |
7f84eef0 SS |
687 | static void handle_cmd_completion(struct xhci_hcd *xhci, |
688 | struct xhci_event_cmd *event) | |
689 | { | |
3ffbba95 | 690 | int slot_id = TRB_TO_SLOT_ID(event->flags); |
7f84eef0 SS |
691 | u64 cmd_dma; |
692 | dma_addr_t cmd_dequeue_dma; | |
ac9d8fe7 SS |
693 | struct xhci_input_control_ctx *ctrl_ctx; |
694 | unsigned int ep_index; | |
695 | struct xhci_ring *ep_ring; | |
696 | unsigned int ep_state; | |
7f84eef0 | 697 | |
8e595a5d | 698 | cmd_dma = event->cmd_trb; |
23e3be11 | 699 | cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, |
7f84eef0 SS |
700 | xhci->cmd_ring->dequeue); |
701 | /* Is the command ring deq ptr out of sync with the deq seg ptr? */ | |
702 | if (cmd_dequeue_dma == 0) { | |
703 | xhci->error_bitmask |= 1 << 4; | |
704 | return; | |
705 | } | |
706 | /* Does the DMA address match our internal dequeue pointer address? */ | |
707 | if (cmd_dma != (u64) cmd_dequeue_dma) { | |
708 | xhci->error_bitmask |= 1 << 5; | |
709 | return; | |
710 | } | |
711 | switch (xhci->cmd_ring->dequeue->generic.field[3] & TRB_TYPE_BITMASK) { | |
3ffbba95 SS |
712 | case TRB_TYPE(TRB_ENABLE_SLOT): |
713 | if (GET_COMP_CODE(event->status) == COMP_SUCCESS) | |
714 | xhci->slot_id = slot_id; | |
715 | else | |
716 | xhci->slot_id = 0; | |
717 | complete(&xhci->addr_dev); | |
718 | break; | |
719 | case TRB_TYPE(TRB_DISABLE_SLOT): | |
720 | if (xhci->devs[slot_id]) | |
721 | xhci_free_virt_device(xhci, slot_id); | |
722 | break; | |
f94e0186 | 723 | case TRB_TYPE(TRB_CONFIG_EP): |
ac9d8fe7 SS |
724 | /* |
725 | * Configure endpoint commands can come from the USB core | |
726 | * configuration or alt setting changes, or because the HW | |
727 | * needed an extra configure endpoint command after a reset | |
728 | * endpoint command. In the latter case, the xHCI driver is | |
729 | * not waiting on the configure endpoint command. | |
730 | */ | |
731 | ctrl_ctx = xhci_get_input_control_ctx(xhci, | |
732 | xhci->devs[slot_id]->in_ctx); | |
733 | /* Input ctx add_flags are the endpoint index plus one */ | |
734 | ep_index = xhci_last_valid_endpoint(ctrl_ctx->add_flags) - 1; | |
63a0d9ab | 735 | ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
ac9d8fe7 SS |
736 | if (!ep_ring) { |
737 | /* This must have been an initial configure endpoint */ | |
738 | xhci->devs[slot_id]->cmd_status = | |
739 | GET_COMP_CODE(event->status); | |
740 | complete(&xhci->devs[slot_id]->cmd_completion); | |
741 | break; | |
742 | } | |
63a0d9ab | 743 | ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state; |
ac9d8fe7 SS |
744 | xhci_dbg(xhci, "Completed config ep cmd - last ep index = %d, " |
745 | "state = %d\n", ep_index, ep_state); | |
746 | if (xhci->quirks & XHCI_RESET_EP_QUIRK && | |
747 | ep_state & EP_HALTED) { | |
748 | /* Clear our internal halted state and restart ring */ | |
63a0d9ab | 749 | xhci->devs[slot_id]->eps[ep_index].ep_state &= |
ac9d8fe7 SS |
750 | ~EP_HALTED; |
751 | ring_ep_doorbell(xhci, slot_id, ep_index); | |
752 | } else { | |
753 | xhci->devs[slot_id]->cmd_status = | |
754 | GET_COMP_CODE(event->status); | |
755 | complete(&xhci->devs[slot_id]->cmd_completion); | |
756 | } | |
f94e0186 | 757 | break; |
2d3f1fac SS |
758 | case TRB_TYPE(TRB_EVAL_CONTEXT): |
759 | xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status); | |
760 | complete(&xhci->devs[slot_id]->cmd_completion); | |
761 | break; | |
3ffbba95 SS |
762 | case TRB_TYPE(TRB_ADDR_DEV): |
763 | xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status); | |
764 | complete(&xhci->addr_dev); | |
765 | break; | |
ae636747 SS |
766 | case TRB_TYPE(TRB_STOP_RING): |
767 | handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue); | |
768 | break; | |
769 | case TRB_TYPE(TRB_SET_DEQ): | |
770 | handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue); | |
771 | break; | |
7f84eef0 SS |
772 | case TRB_TYPE(TRB_CMD_NOOP): |
773 | ++xhci->noops_handled; | |
774 | break; | |
a1587d97 SS |
775 | case TRB_TYPE(TRB_RESET_EP): |
776 | handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue); | |
777 | break; | |
7f84eef0 SS |
778 | default: |
779 | /* Skip over unknown commands on the event ring */ | |
780 | xhci->error_bitmask |= 1 << 6; | |
781 | break; | |
782 | } | |
783 | inc_deq(xhci, xhci->cmd_ring, false); | |
784 | } | |
785 | ||
0f2a7930 SS |
786 | static void handle_port_status(struct xhci_hcd *xhci, |
787 | union xhci_trb *event) | |
788 | { | |
789 | u32 port_id; | |
790 | ||
791 | /* Port status change events always have a successful completion code */ | |
792 | if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) { | |
793 | xhci_warn(xhci, "WARN: xHC returned failed port status event\n"); | |
794 | xhci->error_bitmask |= 1 << 8; | |
795 | } | |
796 | /* FIXME: core doesn't care about all port link state changes yet */ | |
797 | port_id = GET_PORT_ID(event->generic.field[0]); | |
798 | xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id); | |
799 | ||
800 | /* Update event ring dequeue pointer before dropping the lock */ | |
801 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 802 | xhci_set_hc_event_deq(xhci); |
0f2a7930 SS |
803 | |
804 | spin_unlock(&xhci->lock); | |
805 | /* Pass this up to the core */ | |
806 | usb_hcd_poll_rh_status(xhci_to_hcd(xhci)); | |
807 | spin_lock(&xhci->lock); | |
808 | } | |
809 | ||
d0e96f5a SS |
810 | /* |
811 | * This TD is defined by the TRBs starting at start_trb in start_seg and ending | |
812 | * at end_trb, which may be in another segment. If the suspect DMA address is a | |
813 | * TRB in this TD, this function returns that TRB's segment. Otherwise it | |
814 | * returns 0. | |
815 | */ | |
816 | static struct xhci_segment *trb_in_td( | |
817 | struct xhci_segment *start_seg, | |
818 | union xhci_trb *start_trb, | |
819 | union xhci_trb *end_trb, | |
820 | dma_addr_t suspect_dma) | |
821 | { | |
822 | dma_addr_t start_dma; | |
823 | dma_addr_t end_seg_dma; | |
824 | dma_addr_t end_trb_dma; | |
825 | struct xhci_segment *cur_seg; | |
826 | ||
23e3be11 | 827 | start_dma = xhci_trb_virt_to_dma(start_seg, start_trb); |
d0e96f5a SS |
828 | cur_seg = start_seg; |
829 | ||
830 | do { | |
ae636747 | 831 | /* We may get an event for a Link TRB in the middle of a TD */ |
23e3be11 | 832 | end_seg_dma = xhci_trb_virt_to_dma(cur_seg, |
ae636747 | 833 | &start_seg->trbs[TRBS_PER_SEGMENT - 1]); |
d0e96f5a | 834 | /* If the end TRB isn't in this segment, this is set to 0 */ |
23e3be11 | 835 | end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb); |
d0e96f5a SS |
836 | |
837 | if (end_trb_dma > 0) { | |
838 | /* The end TRB is in this segment, so suspect should be here */ | |
839 | if (start_dma <= end_trb_dma) { | |
840 | if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma) | |
841 | return cur_seg; | |
842 | } else { | |
843 | /* Case for one segment with | |
844 | * a TD wrapped around to the top | |
845 | */ | |
846 | if ((suspect_dma >= start_dma && | |
847 | suspect_dma <= end_seg_dma) || | |
848 | (suspect_dma >= cur_seg->dma && | |
849 | suspect_dma <= end_trb_dma)) | |
850 | return cur_seg; | |
851 | } | |
852 | return 0; | |
853 | } else { | |
854 | /* Might still be somewhere in this segment */ | |
855 | if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma) | |
856 | return cur_seg; | |
857 | } | |
858 | cur_seg = cur_seg->next; | |
23e3be11 | 859 | start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]); |
d0e96f5a SS |
860 | } while (1); |
861 | ||
862 | } | |
863 | ||
864 | /* | |
865 | * If this function returns an error condition, it means it got a Transfer | |
866 | * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address. | |
867 | * At this point, the host controller is probably hosed and should be reset. | |
868 | */ | |
869 | static int handle_tx_event(struct xhci_hcd *xhci, | |
870 | struct xhci_transfer_event *event) | |
871 | { | |
872 | struct xhci_virt_device *xdev; | |
63a0d9ab | 873 | struct xhci_virt_ep *ep; |
d0e96f5a | 874 | struct xhci_ring *ep_ring; |
82d1009f | 875 | unsigned int slot_id; |
d0e96f5a SS |
876 | int ep_index; |
877 | struct xhci_td *td = 0; | |
878 | dma_addr_t event_dma; | |
879 | struct xhci_segment *event_seg; | |
880 | union xhci_trb *event_trb; | |
ae636747 | 881 | struct urb *urb = 0; |
d0e96f5a | 882 | int status = -EINPROGRESS; |
d115b048 | 883 | struct xhci_ep_ctx *ep_ctx; |
66d1eebc | 884 | u32 trb_comp_code; |
d0e96f5a | 885 | |
66e49d87 | 886 | xhci_dbg(xhci, "In %s\n", __func__); |
82d1009f SS |
887 | slot_id = TRB_TO_SLOT_ID(event->flags); |
888 | xdev = xhci->devs[slot_id]; | |
d0e96f5a SS |
889 | if (!xdev) { |
890 | xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n"); | |
891 | return -ENODEV; | |
892 | } | |
893 | ||
894 | /* Endpoint ID is 1 based, our index is zero based */ | |
895 | ep_index = TRB_TO_EP_ID(event->flags) - 1; | |
66e49d87 | 896 | xhci_dbg(xhci, "%s - ep index = %d\n", __func__, ep_index); |
63a0d9ab SS |
897 | ep = &xdev->eps[ep_index]; |
898 | ep_ring = ep->ring; | |
d115b048 JY |
899 | ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
900 | if (!ep_ring || (ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) { | |
d0e96f5a SS |
901 | xhci_err(xhci, "ERROR Transfer event pointed to disabled endpoint\n"); |
902 | return -ENODEV; | |
903 | } | |
904 | ||
8e595a5d | 905 | event_dma = event->buffer; |
d0e96f5a | 906 | /* This TRB should be in the TD at the head of this ring's TD list */ |
66e49d87 | 907 | xhci_dbg(xhci, "%s - checking for list empty\n", __func__); |
d0e96f5a SS |
908 | if (list_empty(&ep_ring->td_list)) { |
909 | xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n", | |
910 | TRB_TO_SLOT_ID(event->flags), ep_index); | |
911 | xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", | |
912 | (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10); | |
913 | xhci_print_trb_offsets(xhci, (union xhci_trb *) event); | |
914 | urb = NULL; | |
915 | goto cleanup; | |
916 | } | |
66e49d87 | 917 | xhci_dbg(xhci, "%s - getting list entry\n", __func__); |
d0e96f5a SS |
918 | td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list); |
919 | ||
920 | /* Is this a TRB in the currently executing TD? */ | |
66e49d87 | 921 | xhci_dbg(xhci, "%s - looking for TD\n", __func__); |
d0e96f5a SS |
922 | event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue, |
923 | td->last_trb, event_dma); | |
66e49d87 | 924 | xhci_dbg(xhci, "%s - found event_seg = %p\n", __func__, event_seg); |
d0e96f5a SS |
925 | if (!event_seg) { |
926 | /* HC is busted, give up! */ | |
927 | xhci_err(xhci, "ERROR Transfer event TRB DMA ptr not part of current TD\n"); | |
928 | return -ESHUTDOWN; | |
929 | } | |
930 | event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / sizeof(*event_trb)]; | |
b10de142 SS |
931 | xhci_dbg(xhci, "Event TRB with TRB type ID %u\n", |
932 | (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10); | |
8e595a5d SS |
933 | xhci_dbg(xhci, "Offset 0x00 (buffer lo) = 0x%x\n", |
934 | lower_32_bits(event->buffer)); | |
935 | xhci_dbg(xhci, "Offset 0x04 (buffer hi) = 0x%x\n", | |
936 | upper_32_bits(event->buffer)); | |
b10de142 SS |
937 | xhci_dbg(xhci, "Offset 0x08 (transfer length) = 0x%x\n", |
938 | (unsigned int) event->transfer_len); | |
939 | xhci_dbg(xhci, "Offset 0x0C (flags) = 0x%x\n", | |
940 | (unsigned int) event->flags); | |
941 | ||
942 | /* Look for common error cases */ | |
66d1eebc SS |
943 | trb_comp_code = GET_COMP_CODE(event->transfer_len); |
944 | switch (trb_comp_code) { | |
b10de142 SS |
945 | /* Skip codes that require special handling depending on |
946 | * transfer type | |
947 | */ | |
948 | case COMP_SUCCESS: | |
949 | case COMP_SHORT_TX: | |
950 | break; | |
ae636747 SS |
951 | case COMP_STOP: |
952 | xhci_dbg(xhci, "Stopped on Transfer TRB\n"); | |
953 | break; | |
954 | case COMP_STOP_INVAL: | |
955 | xhci_dbg(xhci, "Stopped on No-op or Link TRB\n"); | |
956 | break; | |
b10de142 SS |
957 | case COMP_STALL: |
958 | xhci_warn(xhci, "WARN: Stalled endpoint\n"); | |
63a0d9ab | 959 | ep->ep_state |= EP_HALTED; |
b10de142 SS |
960 | status = -EPIPE; |
961 | break; | |
962 | case COMP_TRB_ERR: | |
963 | xhci_warn(xhci, "WARN: TRB error on endpoint\n"); | |
964 | status = -EILSEQ; | |
965 | break; | |
966 | case COMP_TX_ERR: | |
967 | xhci_warn(xhci, "WARN: transfer error on endpoint\n"); | |
968 | status = -EPROTO; | |
969 | break; | |
4a73143c SS |
970 | case COMP_BABBLE: |
971 | xhci_warn(xhci, "WARN: babble error on endpoint\n"); | |
972 | status = -EOVERFLOW; | |
973 | break; | |
b10de142 SS |
974 | case COMP_DB_ERR: |
975 | xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n"); | |
976 | status = -ENOSR; | |
977 | break; | |
978 | default: | |
979 | xhci_warn(xhci, "ERROR Unknown event condition, HC probably busted\n"); | |
980 | urb = NULL; | |
981 | goto cleanup; | |
982 | } | |
d0e96f5a SS |
983 | /* Now update the urb's actual_length and give back to the core */ |
984 | /* Was this a control transfer? */ | |
985 | if (usb_endpoint_xfer_control(&td->urb->ep->desc)) { | |
986 | xhci_debug_trb(xhci, xhci->event_ring->dequeue); | |
66d1eebc | 987 | switch (trb_comp_code) { |
d0e96f5a SS |
988 | case COMP_SUCCESS: |
989 | if (event_trb == ep_ring->dequeue) { | |
990 | xhci_warn(xhci, "WARN: Success on ctrl setup TRB without IOC set??\n"); | |
991 | status = -ESHUTDOWN; | |
992 | } else if (event_trb != td->last_trb) { | |
993 | xhci_warn(xhci, "WARN: Success on ctrl data TRB without IOC set??\n"); | |
994 | status = -ESHUTDOWN; | |
995 | } else { | |
996 | xhci_dbg(xhci, "Successful control transfer!\n"); | |
997 | status = 0; | |
998 | } | |
999 | break; | |
1000 | case COMP_SHORT_TX: | |
1001 | xhci_warn(xhci, "WARN: short transfer on control ep\n"); | |
204970a4 SS |
1002 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
1003 | status = -EREMOTEIO; | |
1004 | else | |
1005 | status = 0; | |
d0e96f5a | 1006 | break; |
83fbcdcc SS |
1007 | case COMP_BABBLE: |
1008 | /* The 0.96 spec says a babbling control endpoint | |
1009 | * is not halted. The 0.96 spec says it is. Some HW | |
1010 | * claims to be 0.95 compliant, but it halts the control | |
1011 | * endpoint anyway. Check if a babble halted the | |
1012 | * endpoint. | |
1013 | */ | |
1014 | if (ep_ctx->ep_info != EP_STATE_HALTED) | |
1015 | break; | |
1016 | /* else fall through */ | |
82d1009f SS |
1017 | case COMP_STALL: |
1018 | /* Did we transfer part of the data (middle) phase? */ | |
1019 | if (event_trb != ep_ring->dequeue && | |
1020 | event_trb != td->last_trb) | |
1021 | td->urb->actual_length = | |
1022 | td->urb->transfer_buffer_length | |
1023 | - TRB_LEN(event->transfer_len); | |
1024 | else | |
1025 | td->urb->actual_length = 0; | |
1026 | ||
63a0d9ab SS |
1027 | ep->stopped_td = td; |
1028 | ep->stopped_trb = event_trb; | |
82d1009f | 1029 | xhci_queue_reset_ep(xhci, slot_id, ep_index); |
63a0d9ab | 1030 | xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index); |
82d1009f SS |
1031 | xhci_ring_cmd_db(xhci); |
1032 | goto td_cleanup; | |
d0e96f5a | 1033 | default: |
b10de142 SS |
1034 | /* Others already handled above */ |
1035 | break; | |
d0e96f5a SS |
1036 | } |
1037 | /* | |
1038 | * Did we transfer any data, despite the errors that might have | |
1039 | * happened? I.e. did we get past the setup stage? | |
1040 | */ | |
1041 | if (event_trb != ep_ring->dequeue) { | |
1042 | /* The event was for the status stage */ | |
1043 | if (event_trb == td->last_trb) { | |
c92bcfa7 SS |
1044 | if (td->urb->actual_length != 0) { |
1045 | /* Don't overwrite a previously set error code */ | |
204970a4 SS |
1046 | if ((status == -EINPROGRESS || |
1047 | status == 0) && | |
1048 | (td->urb->transfer_flags | |
1049 | & URB_SHORT_NOT_OK)) | |
c92bcfa7 SS |
1050 | /* Did we already see a short data stage? */ |
1051 | status = -EREMOTEIO; | |
1052 | } else { | |
62889610 SS |
1053 | td->urb->actual_length = |
1054 | td->urb->transfer_buffer_length; | |
c92bcfa7 | 1055 | } |
d0e96f5a | 1056 | } else { |
ae636747 | 1057 | /* Maybe the event was for the data stage? */ |
66d1eebc | 1058 | if (trb_comp_code != COMP_STOP_INVAL) { |
ae636747 SS |
1059 | /* We didn't stop on a link TRB in the middle */ |
1060 | td->urb->actual_length = | |
1061 | td->urb->transfer_buffer_length - | |
1062 | TRB_LEN(event->transfer_len); | |
62889610 SS |
1063 | xhci_dbg(xhci, "Waiting for status stage event\n"); |
1064 | urb = NULL; | |
1065 | goto cleanup; | |
1066 | } | |
d0e96f5a SS |
1067 | } |
1068 | } | |
d0e96f5a | 1069 | } else { |
66d1eebc | 1070 | switch (trb_comp_code) { |
b10de142 SS |
1071 | case COMP_SUCCESS: |
1072 | /* Double check that the HW transferred everything. */ | |
1073 | if (event_trb != td->last_trb) { | |
1074 | xhci_warn(xhci, "WARN Successful completion " | |
1075 | "on short TX\n"); | |
1076 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
1077 | status = -EREMOTEIO; | |
1078 | else | |
1079 | status = 0; | |
1080 | } else { | |
624defa1 SS |
1081 | if (usb_endpoint_xfer_bulk(&td->urb->ep->desc)) |
1082 | xhci_dbg(xhci, "Successful bulk " | |
1083 | "transfer!\n"); | |
1084 | else | |
1085 | xhci_dbg(xhci, "Successful interrupt " | |
1086 | "transfer!\n"); | |
b10de142 SS |
1087 | status = 0; |
1088 | } | |
1089 | break; | |
1090 | case COMP_SHORT_TX: | |
1091 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
1092 | status = -EREMOTEIO; | |
1093 | else | |
1094 | status = 0; | |
1095 | break; | |
1096 | default: | |
1097 | /* Others already handled above */ | |
1098 | break; | |
1099 | } | |
1100 | dev_dbg(&td->urb->dev->dev, | |
1101 | "ep %#x - asked for %d bytes, " | |
1102 | "%d bytes untransferred\n", | |
1103 | td->urb->ep->desc.bEndpointAddress, | |
1104 | td->urb->transfer_buffer_length, | |
1105 | TRB_LEN(event->transfer_len)); | |
1106 | /* Fast path - was this the last TRB in the TD for this URB? */ | |
1107 | if (event_trb == td->last_trb) { | |
1108 | if (TRB_LEN(event->transfer_len) != 0) { | |
1109 | td->urb->actual_length = | |
1110 | td->urb->transfer_buffer_length - | |
1111 | TRB_LEN(event->transfer_len); | |
99eb32db SS |
1112 | if (td->urb->transfer_buffer_length < |
1113 | td->urb->actual_length) { | |
b10de142 SS |
1114 | xhci_warn(xhci, "HC gave bad length " |
1115 | "of %d bytes left\n", | |
1116 | TRB_LEN(event->transfer_len)); | |
1117 | td->urb->actual_length = 0; | |
2f697f6c SS |
1118 | if (td->urb->transfer_flags & |
1119 | URB_SHORT_NOT_OK) | |
1120 | status = -EREMOTEIO; | |
1121 | else | |
1122 | status = 0; | |
b10de142 | 1123 | } |
c92bcfa7 SS |
1124 | /* Don't overwrite a previously set error code */ |
1125 | if (status == -EINPROGRESS) { | |
1126 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) | |
1127 | status = -EREMOTEIO; | |
1128 | else | |
1129 | status = 0; | |
1130 | } | |
b10de142 SS |
1131 | } else { |
1132 | td->urb->actual_length = td->urb->transfer_buffer_length; | |
1133 | /* Ignore a short packet completion if the | |
1134 | * untransferred length was zero. | |
1135 | */ | |
c92bcfa7 SS |
1136 | if (status == -EREMOTEIO) |
1137 | status = 0; | |
b10de142 SS |
1138 | } |
1139 | } else { | |
ae636747 SS |
1140 | /* Slow path - walk the list, starting from the dequeue |
1141 | * pointer, to get the actual length transferred. | |
b10de142 | 1142 | */ |
ae636747 SS |
1143 | union xhci_trb *cur_trb; |
1144 | struct xhci_segment *cur_seg; | |
1145 | ||
b10de142 | 1146 | td->urb->actual_length = 0; |
ae636747 SS |
1147 | for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg; |
1148 | cur_trb != event_trb; | |
1149 | next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { | |
1150 | if (TRB_TYPE(cur_trb->generic.field[3]) != TRB_TR_NOOP && | |
1151 | TRB_TYPE(cur_trb->generic.field[3]) != TRB_LINK) | |
1152 | td->urb->actual_length += | |
1153 | TRB_LEN(cur_trb->generic.field[2]); | |
b10de142 | 1154 | } |
ae636747 SS |
1155 | /* If the ring didn't stop on a Link or No-op TRB, add |
1156 | * in the actual bytes transferred from the Normal TRB | |
1157 | */ | |
66d1eebc | 1158 | if (trb_comp_code != COMP_STOP_INVAL) |
ae636747 SS |
1159 | td->urb->actual_length += |
1160 | TRB_LEN(cur_trb->generic.field[2]) - | |
1161 | TRB_LEN(event->transfer_len); | |
b10de142 | 1162 | } |
d0e96f5a | 1163 | } |
66d1eebc SS |
1164 | if (trb_comp_code == COMP_STOP_INVAL || |
1165 | trb_comp_code == COMP_STOP) { | |
c92bcfa7 SS |
1166 | /* The Endpoint Stop Command completion will take care of any |
1167 | * stopped TDs. A stopped TD may be restarted, so don't update | |
1168 | * the ring dequeue pointer or take this TD off any lists yet. | |
1169 | */ | |
63a0d9ab SS |
1170 | ep->stopped_td = td; |
1171 | ep->stopped_trb = event_trb; | |
ae636747 | 1172 | } else { |
83fbcdcc SS |
1173 | if (trb_comp_code == COMP_STALL || |
1174 | trb_comp_code == COMP_BABBLE) { | |
c92bcfa7 SS |
1175 | /* The transfer is completed from the driver's |
1176 | * perspective, but we need to issue a set dequeue | |
1177 | * command for this stalled endpoint to move the dequeue | |
1178 | * pointer past the TD. We can't do that here because | |
1179 | * the halt condition must be cleared first. | |
1180 | */ | |
63a0d9ab SS |
1181 | ep->stopped_td = td; |
1182 | ep->stopped_trb = event_trb; | |
c92bcfa7 SS |
1183 | } else { |
1184 | /* Update ring dequeue pointer */ | |
1185 | while (ep_ring->dequeue != td->last_trb) | |
1186 | inc_deq(xhci, ep_ring, false); | |
ae636747 | 1187 | inc_deq(xhci, ep_ring, false); |
c92bcfa7 | 1188 | } |
b10de142 | 1189 | |
82d1009f | 1190 | td_cleanup: |
ae636747 SS |
1191 | /* Clean up the endpoint's TD list */ |
1192 | urb = td->urb; | |
99eb32db SS |
1193 | /* Do one last check of the actual transfer length. |
1194 | * If the host controller said we transferred more data than | |
1195 | * the buffer length, urb->actual_length will be a very big | |
1196 | * number (since it's unsigned). Play it safe and say we didn't | |
1197 | * transfer anything. | |
1198 | */ | |
1199 | if (urb->actual_length > urb->transfer_buffer_length) { | |
1200 | xhci_warn(xhci, "URB transfer length is wrong, " | |
1201 | "xHC issue? req. len = %u, " | |
1202 | "act. len = %u\n", | |
1203 | urb->transfer_buffer_length, | |
1204 | urb->actual_length); | |
1205 | urb->actual_length = 0; | |
2f697f6c SS |
1206 | if (td->urb->transfer_flags & URB_SHORT_NOT_OK) |
1207 | status = -EREMOTEIO; | |
1208 | else | |
1209 | status = 0; | |
99eb32db | 1210 | } |
ae636747 SS |
1211 | list_del(&td->td_list); |
1212 | /* Was this TD slated to be cancelled but completed anyway? */ | |
1213 | if (!list_empty(&td->cancelled_td_list)) { | |
1214 | list_del(&td->cancelled_td_list); | |
63a0d9ab | 1215 | ep->cancels_pending--; |
ae636747 | 1216 | } |
82d1009f SS |
1217 | /* Leave the TD around for the reset endpoint function to use |
1218 | * (but only if it's not a control endpoint, since we already | |
1219 | * queued the Set TR dequeue pointer command for stalled | |
1220 | * control endpoints). | |
1221 | */ | |
1222 | if (usb_endpoint_xfer_control(&urb->ep->desc) || | |
83fbcdcc SS |
1223 | (trb_comp_code != COMP_STALL && |
1224 | trb_comp_code != COMP_BABBLE)) { | |
c92bcfa7 SS |
1225 | kfree(td); |
1226 | } | |
ae636747 SS |
1227 | urb->hcpriv = NULL; |
1228 | } | |
d0e96f5a SS |
1229 | cleanup: |
1230 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 1231 | xhci_set_hc_event_deq(xhci); |
d0e96f5a | 1232 | |
b10de142 | 1233 | /* FIXME for multi-TD URBs (who have buffers bigger than 64MB) */ |
d0e96f5a SS |
1234 | if (urb) { |
1235 | usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), urb); | |
66e49d87 | 1236 | xhci_dbg(xhci, "Giveback URB %p, len = %d, status = %d\n", |
9191eee7 | 1237 | urb, urb->actual_length, status); |
d0e96f5a SS |
1238 | spin_unlock(&xhci->lock); |
1239 | usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, status); | |
1240 | spin_lock(&xhci->lock); | |
1241 | } | |
1242 | return 0; | |
1243 | } | |
1244 | ||
0f2a7930 SS |
1245 | /* |
1246 | * This function handles all OS-owned events on the event ring. It may drop | |
1247 | * xhci->lock between event processing (e.g. to pass up port status changes). | |
1248 | */ | |
b7258a4a | 1249 | void xhci_handle_event(struct xhci_hcd *xhci) |
7f84eef0 SS |
1250 | { |
1251 | union xhci_trb *event; | |
0f2a7930 | 1252 | int update_ptrs = 1; |
d0e96f5a | 1253 | int ret; |
7f84eef0 | 1254 | |
66e49d87 | 1255 | xhci_dbg(xhci, "In %s\n", __func__); |
7f84eef0 SS |
1256 | if (!xhci->event_ring || !xhci->event_ring->dequeue) { |
1257 | xhci->error_bitmask |= 1 << 1; | |
1258 | return; | |
1259 | } | |
1260 | ||
1261 | event = xhci->event_ring->dequeue; | |
1262 | /* Does the HC or OS own the TRB? */ | |
1263 | if ((event->event_cmd.flags & TRB_CYCLE) != | |
1264 | xhci->event_ring->cycle_state) { | |
1265 | xhci->error_bitmask |= 1 << 2; | |
1266 | return; | |
1267 | } | |
66e49d87 | 1268 | xhci_dbg(xhci, "%s - OS owns TRB\n", __func__); |
7f84eef0 | 1269 | |
0f2a7930 | 1270 | /* FIXME: Handle more event types. */ |
7f84eef0 SS |
1271 | switch ((event->event_cmd.flags & TRB_TYPE_BITMASK)) { |
1272 | case TRB_TYPE(TRB_COMPLETION): | |
66e49d87 | 1273 | xhci_dbg(xhci, "%s - calling handle_cmd_completion\n", __func__); |
7f84eef0 | 1274 | handle_cmd_completion(xhci, &event->event_cmd); |
66e49d87 | 1275 | xhci_dbg(xhci, "%s - returned from handle_cmd_completion\n", __func__); |
7f84eef0 | 1276 | break; |
0f2a7930 | 1277 | case TRB_TYPE(TRB_PORT_STATUS): |
66e49d87 | 1278 | xhci_dbg(xhci, "%s - calling handle_port_status\n", __func__); |
0f2a7930 | 1279 | handle_port_status(xhci, event); |
66e49d87 | 1280 | xhci_dbg(xhci, "%s - returned from handle_port_status\n", __func__); |
0f2a7930 SS |
1281 | update_ptrs = 0; |
1282 | break; | |
d0e96f5a | 1283 | case TRB_TYPE(TRB_TRANSFER): |
66e49d87 | 1284 | xhci_dbg(xhci, "%s - calling handle_tx_event\n", __func__); |
d0e96f5a | 1285 | ret = handle_tx_event(xhci, &event->trans_event); |
66e49d87 | 1286 | xhci_dbg(xhci, "%s - returned from handle_tx_event\n", __func__); |
d0e96f5a SS |
1287 | if (ret < 0) |
1288 | xhci->error_bitmask |= 1 << 9; | |
1289 | else | |
1290 | update_ptrs = 0; | |
1291 | break; | |
7f84eef0 SS |
1292 | default: |
1293 | xhci->error_bitmask |= 1 << 3; | |
1294 | } | |
1295 | ||
0f2a7930 SS |
1296 | if (update_ptrs) { |
1297 | /* Update SW and HC event ring dequeue pointer */ | |
1298 | inc_deq(xhci, xhci->event_ring, true); | |
23e3be11 | 1299 | xhci_set_hc_event_deq(xhci); |
0f2a7930 | 1300 | } |
7f84eef0 | 1301 | /* Are there more items on the event ring? */ |
b7258a4a | 1302 | xhci_handle_event(xhci); |
7f84eef0 SS |
1303 | } |
1304 | ||
d0e96f5a SS |
1305 | /**** Endpoint Ring Operations ****/ |
1306 | ||
7f84eef0 SS |
1307 | /* |
1308 | * Generic function for queueing a TRB on a ring. | |
1309 | * The caller must have checked to make sure there's room on the ring. | |
1310 | */ | |
1311 | static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring, | |
1312 | bool consumer, | |
1313 | u32 field1, u32 field2, u32 field3, u32 field4) | |
1314 | { | |
1315 | struct xhci_generic_trb *trb; | |
1316 | ||
1317 | trb = &ring->enqueue->generic; | |
1318 | trb->field[0] = field1; | |
1319 | trb->field[1] = field2; | |
1320 | trb->field[2] = field3; | |
1321 | trb->field[3] = field4; | |
1322 | inc_enq(xhci, ring, consumer); | |
1323 | } | |
1324 | ||
d0e96f5a SS |
1325 | /* |
1326 | * Does various checks on the endpoint ring, and makes it ready to queue num_trbs. | |
1327 | * FIXME allocate segments if the ring is full. | |
1328 | */ | |
1329 | static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, | |
1330 | u32 ep_state, unsigned int num_trbs, gfp_t mem_flags) | |
1331 | { | |
1332 | /* Make sure the endpoint has been added to xHC schedule */ | |
1333 | xhci_dbg(xhci, "Endpoint state = 0x%x\n", ep_state); | |
1334 | switch (ep_state) { | |
1335 | case EP_STATE_DISABLED: | |
1336 | /* | |
1337 | * USB core changed config/interfaces without notifying us, | |
1338 | * or hardware is reporting the wrong state. | |
1339 | */ | |
1340 | xhci_warn(xhci, "WARN urb submitted to disabled ep\n"); | |
1341 | return -ENOENT; | |
d0e96f5a | 1342 | case EP_STATE_ERROR: |
c92bcfa7 | 1343 | xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n"); |
d0e96f5a SS |
1344 | /* FIXME event handling code for error needs to clear it */ |
1345 | /* XXX not sure if this should be -ENOENT or not */ | |
1346 | return -EINVAL; | |
c92bcfa7 SS |
1347 | case EP_STATE_HALTED: |
1348 | xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n"); | |
d0e96f5a SS |
1349 | case EP_STATE_STOPPED: |
1350 | case EP_STATE_RUNNING: | |
1351 | break; | |
1352 | default: | |
1353 | xhci_err(xhci, "ERROR unknown endpoint state for ep\n"); | |
1354 | /* | |
1355 | * FIXME issue Configure Endpoint command to try to get the HC | |
1356 | * back into a known state. | |
1357 | */ | |
1358 | return -EINVAL; | |
1359 | } | |
1360 | if (!room_on_ring(xhci, ep_ring, num_trbs)) { | |
1361 | /* FIXME allocate more room */ | |
1362 | xhci_err(xhci, "ERROR no room on ep ring\n"); | |
1363 | return -ENOMEM; | |
1364 | } | |
1365 | return 0; | |
1366 | } | |
1367 | ||
23e3be11 | 1368 | static int prepare_transfer(struct xhci_hcd *xhci, |
d0e96f5a SS |
1369 | struct xhci_virt_device *xdev, |
1370 | unsigned int ep_index, | |
1371 | unsigned int num_trbs, | |
1372 | struct urb *urb, | |
1373 | struct xhci_td **td, | |
1374 | gfp_t mem_flags) | |
1375 | { | |
1376 | int ret; | |
d115b048 | 1377 | struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); |
63a0d9ab | 1378 | ret = prepare_ring(xhci, xdev->eps[ep_index].ring, |
d115b048 | 1379 | ep_ctx->ep_info & EP_STATE_MASK, |
d0e96f5a SS |
1380 | num_trbs, mem_flags); |
1381 | if (ret) | |
1382 | return ret; | |
1383 | *td = kzalloc(sizeof(struct xhci_td), mem_flags); | |
1384 | if (!*td) | |
1385 | return -ENOMEM; | |
1386 | INIT_LIST_HEAD(&(*td)->td_list); | |
ae636747 | 1387 | INIT_LIST_HEAD(&(*td)->cancelled_td_list); |
d0e96f5a SS |
1388 | |
1389 | ret = usb_hcd_link_urb_to_ep(xhci_to_hcd(xhci), urb); | |
1390 | if (unlikely(ret)) { | |
1391 | kfree(*td); | |
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | (*td)->urb = urb; | |
1396 | urb->hcpriv = (void *) (*td); | |
1397 | /* Add this TD to the tail of the endpoint ring's TD list */ | |
63a0d9ab SS |
1398 | list_add_tail(&(*td)->td_list, &xdev->eps[ep_index].ring->td_list); |
1399 | (*td)->start_seg = xdev->eps[ep_index].ring->enq_seg; | |
1400 | (*td)->first_trb = xdev->eps[ep_index].ring->enqueue; | |
d0e96f5a SS |
1401 | |
1402 | return 0; | |
1403 | } | |
1404 | ||
23e3be11 | 1405 | static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb) |
8a96c052 SS |
1406 | { |
1407 | int num_sgs, num_trbs, running_total, temp, i; | |
1408 | struct scatterlist *sg; | |
1409 | ||
1410 | sg = NULL; | |
1411 | num_sgs = urb->num_sgs; | |
1412 | temp = urb->transfer_buffer_length; | |
1413 | ||
1414 | xhci_dbg(xhci, "count sg list trbs: \n"); | |
1415 | num_trbs = 0; | |
1416 | for_each_sg(urb->sg->sg, sg, num_sgs, i) { | |
1417 | unsigned int previous_total_trbs = num_trbs; | |
1418 | unsigned int len = sg_dma_len(sg); | |
1419 | ||
1420 | /* Scatter gather list entries may cross 64KB boundaries */ | |
1421 | running_total = TRB_MAX_BUFF_SIZE - | |
1422 | (sg_dma_address(sg) & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1423 | if (running_total != 0) | |
1424 | num_trbs++; | |
1425 | ||
1426 | /* How many more 64KB chunks to transfer, how many more TRBs? */ | |
1427 | while (running_total < sg_dma_len(sg)) { | |
1428 | num_trbs++; | |
1429 | running_total += TRB_MAX_BUFF_SIZE; | |
1430 | } | |
700e2052 GKH |
1431 | xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n", |
1432 | i, (unsigned long long)sg_dma_address(sg), | |
1433 | len, len, num_trbs - previous_total_trbs); | |
8a96c052 SS |
1434 | |
1435 | len = min_t(int, len, temp); | |
1436 | temp -= len; | |
1437 | if (temp == 0) | |
1438 | break; | |
1439 | } | |
1440 | xhci_dbg(xhci, "\n"); | |
1441 | if (!in_interrupt()) | |
1442 | dev_dbg(&urb->dev->dev, "ep %#x - urb len = %d, sglist used, num_trbs = %d\n", | |
1443 | urb->ep->desc.bEndpointAddress, | |
1444 | urb->transfer_buffer_length, | |
1445 | num_trbs); | |
1446 | return num_trbs; | |
1447 | } | |
1448 | ||
23e3be11 | 1449 | static void check_trb_math(struct urb *urb, int num_trbs, int running_total) |
8a96c052 SS |
1450 | { |
1451 | if (num_trbs != 0) | |
1452 | dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated number of " | |
1453 | "TRBs, %d left\n", __func__, | |
1454 | urb->ep->desc.bEndpointAddress, num_trbs); | |
1455 | if (running_total != urb->transfer_buffer_length) | |
1456 | dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, " | |
1457 | "queued %#x (%d), asked for %#x (%d)\n", | |
1458 | __func__, | |
1459 | urb->ep->desc.bEndpointAddress, | |
1460 | running_total, running_total, | |
1461 | urb->transfer_buffer_length, | |
1462 | urb->transfer_buffer_length); | |
1463 | } | |
1464 | ||
23e3be11 | 1465 | static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id, |
8a96c052 SS |
1466 | unsigned int ep_index, int start_cycle, |
1467 | struct xhci_generic_trb *start_trb, struct xhci_td *td) | |
1468 | { | |
8a96c052 SS |
1469 | /* |
1470 | * Pass all the TRBs to the hardware at once and make sure this write | |
1471 | * isn't reordered. | |
1472 | */ | |
1473 | wmb(); | |
1474 | start_trb->field[3] |= start_cycle; | |
ae636747 | 1475 | ring_ep_doorbell(xhci, slot_id, ep_index); |
8a96c052 SS |
1476 | } |
1477 | ||
624defa1 SS |
1478 | /* |
1479 | * xHCI uses normal TRBs for both bulk and interrupt. When the interrupt | |
1480 | * endpoint is to be serviced, the xHC will consume (at most) one TD. A TD | |
1481 | * (comprised of sg list entries) can take several service intervals to | |
1482 | * transmit. | |
1483 | */ | |
1484 | int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, | |
1485 | struct urb *urb, int slot_id, unsigned int ep_index) | |
1486 | { | |
1487 | struct xhci_ep_ctx *ep_ctx = xhci_get_ep_ctx(xhci, | |
1488 | xhci->devs[slot_id]->out_ctx, ep_index); | |
1489 | int xhci_interval; | |
1490 | int ep_interval; | |
1491 | ||
1492 | xhci_interval = EP_INTERVAL_TO_UFRAMES(ep_ctx->ep_info); | |
1493 | ep_interval = urb->interval; | |
1494 | /* Convert to microframes */ | |
1495 | if (urb->dev->speed == USB_SPEED_LOW || | |
1496 | urb->dev->speed == USB_SPEED_FULL) | |
1497 | ep_interval *= 8; | |
1498 | /* FIXME change this to a warning and a suggestion to use the new API | |
1499 | * to set the polling interval (once the API is added). | |
1500 | */ | |
1501 | if (xhci_interval != ep_interval) { | |
1502 | if (!printk_ratelimit()) | |
1503 | dev_dbg(&urb->dev->dev, "Driver uses different interval" | |
1504 | " (%d microframe%s) than xHCI " | |
1505 | "(%d microframe%s)\n", | |
1506 | ep_interval, | |
1507 | ep_interval == 1 ? "" : "s", | |
1508 | xhci_interval, | |
1509 | xhci_interval == 1 ? "" : "s"); | |
1510 | urb->interval = xhci_interval; | |
1511 | /* Convert back to frames for LS/FS devices */ | |
1512 | if (urb->dev->speed == USB_SPEED_LOW || | |
1513 | urb->dev->speed == USB_SPEED_FULL) | |
1514 | urb->interval /= 8; | |
1515 | } | |
1516 | return xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb, slot_id, ep_index); | |
1517 | } | |
1518 | ||
23e3be11 | 1519 | static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
8a96c052 SS |
1520 | struct urb *urb, int slot_id, unsigned int ep_index) |
1521 | { | |
1522 | struct xhci_ring *ep_ring; | |
1523 | unsigned int num_trbs; | |
1524 | struct xhci_td *td; | |
1525 | struct scatterlist *sg; | |
1526 | int num_sgs; | |
1527 | int trb_buff_len, this_sg_len, running_total; | |
1528 | bool first_trb; | |
1529 | u64 addr; | |
1530 | ||
1531 | struct xhci_generic_trb *start_trb; | |
1532 | int start_cycle; | |
1533 | ||
63a0d9ab | 1534 | ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
8a96c052 SS |
1535 | num_trbs = count_sg_trbs_needed(xhci, urb); |
1536 | num_sgs = urb->num_sgs; | |
1537 | ||
23e3be11 | 1538 | trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id], |
8a96c052 SS |
1539 | ep_index, num_trbs, urb, &td, mem_flags); |
1540 | if (trb_buff_len < 0) | |
1541 | return trb_buff_len; | |
1542 | /* | |
1543 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1544 | * until we've finished creating all the other TRBs. The ring's cycle | |
1545 | * state may change as we enqueue the other TRBs, so save it too. | |
1546 | */ | |
1547 | start_trb = &ep_ring->enqueue->generic; | |
1548 | start_cycle = ep_ring->cycle_state; | |
1549 | ||
1550 | running_total = 0; | |
1551 | /* | |
1552 | * How much data is in the first TRB? | |
1553 | * | |
1554 | * There are three forces at work for TRB buffer pointers and lengths: | |
1555 | * 1. We don't want to walk off the end of this sg-list entry buffer. | |
1556 | * 2. The transfer length that the driver requested may be smaller than | |
1557 | * the amount of memory allocated for this scatter-gather list. | |
1558 | * 3. TRBs buffers can't cross 64KB boundaries. | |
1559 | */ | |
1560 | sg = urb->sg->sg; | |
1561 | addr = (u64) sg_dma_address(sg); | |
1562 | this_sg_len = sg_dma_len(sg); | |
1563 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1564 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1565 | trb_buff_len = min_t(int, trb_buff_len, this_sg_len); | |
1566 | if (trb_buff_len > urb->transfer_buffer_length) | |
1567 | trb_buff_len = urb->transfer_buffer_length; | |
1568 | xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n", | |
1569 | trb_buff_len); | |
1570 | ||
1571 | first_trb = true; | |
1572 | /* Queue the first TRB, even if it's zero-length */ | |
1573 | do { | |
1574 | u32 field = 0; | |
f9dc68fe | 1575 | u32 length_field = 0; |
8a96c052 SS |
1576 | |
1577 | /* Don't change the cycle bit of the first TRB until later */ | |
1578 | if (first_trb) | |
1579 | first_trb = false; | |
1580 | else | |
1581 | field |= ep_ring->cycle_state; | |
1582 | ||
1583 | /* Chain all the TRBs together; clear the chain bit in the last | |
1584 | * TRB to indicate it's the last TRB in the chain. | |
1585 | */ | |
1586 | if (num_trbs > 1) { | |
1587 | field |= TRB_CHAIN; | |
1588 | } else { | |
1589 | /* FIXME - add check for ZERO_PACKET flag before this */ | |
1590 | td->last_trb = ep_ring->enqueue; | |
1591 | field |= TRB_IOC; | |
1592 | } | |
1593 | xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), " | |
1594 | "64KB boundary at %#x, end dma = %#x\n", | |
1595 | (unsigned int) addr, trb_buff_len, trb_buff_len, | |
1596 | (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), | |
1597 | (unsigned int) addr + trb_buff_len); | |
1598 | if (TRB_MAX_BUFF_SIZE - | |
1599 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)) < trb_buff_len) { | |
1600 | xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n"); | |
1601 | xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n", | |
1602 | (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), | |
1603 | (unsigned int) addr + trb_buff_len); | |
1604 | } | |
f9dc68fe SS |
1605 | length_field = TRB_LEN(trb_buff_len) | |
1606 | TD_REMAINDER(urb->transfer_buffer_length - running_total) | | |
1607 | TRB_INTR_TARGET(0); | |
8a96c052 | 1608 | queue_trb(xhci, ep_ring, false, |
8e595a5d SS |
1609 | lower_32_bits(addr), |
1610 | upper_32_bits(addr), | |
f9dc68fe | 1611 | length_field, |
8a96c052 SS |
1612 | /* We always want to know if the TRB was short, |
1613 | * or we won't get an event when it completes. | |
1614 | * (Unless we use event data TRBs, which are a | |
1615 | * waste of space and HC resources.) | |
1616 | */ | |
1617 | field | TRB_ISP | TRB_TYPE(TRB_NORMAL)); | |
1618 | --num_trbs; | |
1619 | running_total += trb_buff_len; | |
1620 | ||
1621 | /* Calculate length for next transfer -- | |
1622 | * Are we done queueing all the TRBs for this sg entry? | |
1623 | */ | |
1624 | this_sg_len -= trb_buff_len; | |
1625 | if (this_sg_len == 0) { | |
1626 | --num_sgs; | |
1627 | if (num_sgs == 0) | |
1628 | break; | |
1629 | sg = sg_next(sg); | |
1630 | addr = (u64) sg_dma_address(sg); | |
1631 | this_sg_len = sg_dma_len(sg); | |
1632 | } else { | |
1633 | addr += trb_buff_len; | |
1634 | } | |
1635 | ||
1636 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1637 | (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1638 | trb_buff_len = min_t(int, trb_buff_len, this_sg_len); | |
1639 | if (running_total + trb_buff_len > urb->transfer_buffer_length) | |
1640 | trb_buff_len = | |
1641 | urb->transfer_buffer_length - running_total; | |
1642 | } while (running_total < urb->transfer_buffer_length); | |
1643 | ||
1644 | check_trb_math(urb, num_trbs, running_total); | |
1645 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); | |
1646 | return 0; | |
1647 | } | |
1648 | ||
b10de142 | 1649 | /* This is very similar to what ehci-q.c qtd_fill() does */ |
23e3be11 | 1650 | int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
b10de142 SS |
1651 | struct urb *urb, int slot_id, unsigned int ep_index) |
1652 | { | |
1653 | struct xhci_ring *ep_ring; | |
1654 | struct xhci_td *td; | |
1655 | int num_trbs; | |
1656 | struct xhci_generic_trb *start_trb; | |
1657 | bool first_trb; | |
1658 | int start_cycle; | |
f9dc68fe | 1659 | u32 field, length_field; |
b10de142 SS |
1660 | |
1661 | int running_total, trb_buff_len, ret; | |
1662 | u64 addr; | |
1663 | ||
8a96c052 SS |
1664 | if (urb->sg) |
1665 | return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index); | |
1666 | ||
63a0d9ab | 1667 | ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
b10de142 SS |
1668 | |
1669 | num_trbs = 0; | |
1670 | /* How much data is (potentially) left before the 64KB boundary? */ | |
1671 | running_total = TRB_MAX_BUFF_SIZE - | |
1672 | (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1673 | ||
1674 | /* If there's some data on this 64KB chunk, or we have to send a | |
1675 | * zero-length transfer, we need at least one TRB | |
1676 | */ | |
1677 | if (running_total != 0 || urb->transfer_buffer_length == 0) | |
1678 | num_trbs++; | |
1679 | /* How many more 64KB chunks to transfer, how many more TRBs? */ | |
1680 | while (running_total < urb->transfer_buffer_length) { | |
1681 | num_trbs++; | |
1682 | running_total += TRB_MAX_BUFF_SIZE; | |
1683 | } | |
1684 | /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */ | |
1685 | ||
1686 | if (!in_interrupt()) | |
700e2052 | 1687 | dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d), addr = %#llx, num_trbs = %d\n", |
b10de142 | 1688 | urb->ep->desc.bEndpointAddress, |
8a96c052 SS |
1689 | urb->transfer_buffer_length, |
1690 | urb->transfer_buffer_length, | |
700e2052 | 1691 | (unsigned long long)urb->transfer_dma, |
b10de142 | 1692 | num_trbs); |
8a96c052 | 1693 | |
23e3be11 | 1694 | ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, |
b10de142 SS |
1695 | num_trbs, urb, &td, mem_flags); |
1696 | if (ret < 0) | |
1697 | return ret; | |
1698 | ||
1699 | /* | |
1700 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1701 | * until we've finished creating all the other TRBs. The ring's cycle | |
1702 | * state may change as we enqueue the other TRBs, so save it too. | |
1703 | */ | |
1704 | start_trb = &ep_ring->enqueue->generic; | |
1705 | start_cycle = ep_ring->cycle_state; | |
1706 | ||
1707 | running_total = 0; | |
1708 | /* How much data is in the first TRB? */ | |
1709 | addr = (u64) urb->transfer_dma; | |
1710 | trb_buff_len = TRB_MAX_BUFF_SIZE - | |
1711 | (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); | |
1712 | if (urb->transfer_buffer_length < trb_buff_len) | |
1713 | trb_buff_len = urb->transfer_buffer_length; | |
1714 | ||
1715 | first_trb = true; | |
1716 | ||
1717 | /* Queue the first TRB, even if it's zero-length */ | |
1718 | do { | |
1719 | field = 0; | |
1720 | ||
1721 | /* Don't change the cycle bit of the first TRB until later */ | |
1722 | if (first_trb) | |
1723 | first_trb = false; | |
1724 | else | |
1725 | field |= ep_ring->cycle_state; | |
1726 | ||
1727 | /* Chain all the TRBs together; clear the chain bit in the last | |
1728 | * TRB to indicate it's the last TRB in the chain. | |
1729 | */ | |
1730 | if (num_trbs > 1) { | |
1731 | field |= TRB_CHAIN; | |
1732 | } else { | |
1733 | /* FIXME - add check for ZERO_PACKET flag before this */ | |
1734 | td->last_trb = ep_ring->enqueue; | |
1735 | field |= TRB_IOC; | |
1736 | } | |
f9dc68fe SS |
1737 | length_field = TRB_LEN(trb_buff_len) | |
1738 | TD_REMAINDER(urb->transfer_buffer_length - running_total) | | |
1739 | TRB_INTR_TARGET(0); | |
b10de142 | 1740 | queue_trb(xhci, ep_ring, false, |
8e595a5d SS |
1741 | lower_32_bits(addr), |
1742 | upper_32_bits(addr), | |
f9dc68fe | 1743 | length_field, |
b10de142 SS |
1744 | /* We always want to know if the TRB was short, |
1745 | * or we won't get an event when it completes. | |
1746 | * (Unless we use event data TRBs, which are a | |
1747 | * waste of space and HC resources.) | |
1748 | */ | |
1749 | field | TRB_ISP | TRB_TYPE(TRB_NORMAL)); | |
1750 | --num_trbs; | |
1751 | running_total += trb_buff_len; | |
1752 | ||
1753 | /* Calculate length for next transfer */ | |
1754 | addr += trb_buff_len; | |
1755 | trb_buff_len = urb->transfer_buffer_length - running_total; | |
1756 | if (trb_buff_len > TRB_MAX_BUFF_SIZE) | |
1757 | trb_buff_len = TRB_MAX_BUFF_SIZE; | |
1758 | } while (running_total < urb->transfer_buffer_length); | |
1759 | ||
8a96c052 SS |
1760 | check_trb_math(urb, num_trbs, running_total); |
1761 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); | |
b10de142 SS |
1762 | return 0; |
1763 | } | |
1764 | ||
d0e96f5a | 1765 | /* Caller must have locked xhci->lock */ |
23e3be11 | 1766 | int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, |
d0e96f5a SS |
1767 | struct urb *urb, int slot_id, unsigned int ep_index) |
1768 | { | |
1769 | struct xhci_ring *ep_ring; | |
1770 | int num_trbs; | |
1771 | int ret; | |
1772 | struct usb_ctrlrequest *setup; | |
1773 | struct xhci_generic_trb *start_trb; | |
1774 | int start_cycle; | |
f9dc68fe | 1775 | u32 field, length_field; |
d0e96f5a SS |
1776 | struct xhci_td *td; |
1777 | ||
63a0d9ab | 1778 | ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; |
d0e96f5a SS |
1779 | |
1780 | /* | |
1781 | * Need to copy setup packet into setup TRB, so we can't use the setup | |
1782 | * DMA address. | |
1783 | */ | |
1784 | if (!urb->setup_packet) | |
1785 | return -EINVAL; | |
1786 | ||
1787 | if (!in_interrupt()) | |
1788 | xhci_dbg(xhci, "Queueing ctrl tx for slot id %d, ep %d\n", | |
1789 | slot_id, ep_index); | |
1790 | /* 1 TRB for setup, 1 for status */ | |
1791 | num_trbs = 2; | |
1792 | /* | |
1793 | * Don't need to check if we need additional event data and normal TRBs, | |
1794 | * since data in control transfers will never get bigger than 16MB | |
1795 | * XXX: can we get a buffer that crosses 64KB boundaries? | |
1796 | */ | |
1797 | if (urb->transfer_buffer_length > 0) | |
1798 | num_trbs++; | |
23e3be11 | 1799 | ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, num_trbs, |
d0e96f5a SS |
1800 | urb, &td, mem_flags); |
1801 | if (ret < 0) | |
1802 | return ret; | |
1803 | ||
1804 | /* | |
1805 | * Don't give the first TRB to the hardware (by toggling the cycle bit) | |
1806 | * until we've finished creating all the other TRBs. The ring's cycle | |
1807 | * state may change as we enqueue the other TRBs, so save it too. | |
1808 | */ | |
1809 | start_trb = &ep_ring->enqueue->generic; | |
1810 | start_cycle = ep_ring->cycle_state; | |
1811 | ||
1812 | /* Queue setup TRB - see section 6.4.1.2.1 */ | |
1813 | /* FIXME better way to translate setup_packet into two u32 fields? */ | |
1814 | setup = (struct usb_ctrlrequest *) urb->setup_packet; | |
1815 | queue_trb(xhci, ep_ring, false, | |
1816 | /* FIXME endianness is probably going to bite my ass here. */ | |
1817 | setup->bRequestType | setup->bRequest << 8 | setup->wValue << 16, | |
1818 | setup->wIndex | setup->wLength << 16, | |
1819 | TRB_LEN(8) | TRB_INTR_TARGET(0), | |
1820 | /* Immediate data in pointer */ | |
1821 | TRB_IDT | TRB_TYPE(TRB_SETUP)); | |
1822 | ||
1823 | /* If there's data, queue data TRBs */ | |
1824 | field = 0; | |
f9dc68fe SS |
1825 | length_field = TRB_LEN(urb->transfer_buffer_length) | |
1826 | TD_REMAINDER(urb->transfer_buffer_length) | | |
1827 | TRB_INTR_TARGET(0); | |
d0e96f5a SS |
1828 | if (urb->transfer_buffer_length > 0) { |
1829 | if (setup->bRequestType & USB_DIR_IN) | |
1830 | field |= TRB_DIR_IN; | |
1831 | queue_trb(xhci, ep_ring, false, | |
1832 | lower_32_bits(urb->transfer_dma), | |
1833 | upper_32_bits(urb->transfer_dma), | |
f9dc68fe | 1834 | length_field, |
d0e96f5a SS |
1835 | /* Event on short tx */ |
1836 | field | TRB_ISP | TRB_TYPE(TRB_DATA) | ep_ring->cycle_state); | |
1837 | } | |
1838 | ||
1839 | /* Save the DMA address of the last TRB in the TD */ | |
1840 | td->last_trb = ep_ring->enqueue; | |
1841 | ||
1842 | /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */ | |
1843 | /* If the device sent data, the status stage is an OUT transfer */ | |
1844 | if (urb->transfer_buffer_length > 0 && setup->bRequestType & USB_DIR_IN) | |
1845 | field = 0; | |
1846 | else | |
1847 | field = TRB_DIR_IN; | |
1848 | queue_trb(xhci, ep_ring, false, | |
1849 | 0, | |
1850 | 0, | |
1851 | TRB_INTR_TARGET(0), | |
1852 | /* Event on completion */ | |
1853 | field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state); | |
1854 | ||
8a96c052 | 1855 | giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td); |
d0e96f5a SS |
1856 | return 0; |
1857 | } | |
1858 | ||
1859 | /**** Command Ring Operations ****/ | |
1860 | ||
7f84eef0 SS |
1861 | /* Generic function for queueing a command TRB on the command ring */ |
1862 | static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2, u32 field3, u32 field4) | |
1863 | { | |
1864 | if (!room_on_ring(xhci, xhci->cmd_ring, 1)) { | |
1865 | if (!in_interrupt()) | |
1866 | xhci_err(xhci, "ERR: No room for command on command ring\n"); | |
1867 | return -ENOMEM; | |
1868 | } | |
1869 | queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3, | |
1870 | field4 | xhci->cmd_ring->cycle_state); | |
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | /* Queue a no-op command on the command ring */ | |
1875 | static int queue_cmd_noop(struct xhci_hcd *xhci) | |
1876 | { | |
1877 | return queue_command(xhci, 0, 0, 0, TRB_TYPE(TRB_CMD_NOOP)); | |
1878 | } | |
1879 | ||
1880 | /* | |
1881 | * Place a no-op command on the command ring to test the command and | |
1882 | * event ring. | |
1883 | */ | |
23e3be11 | 1884 | void *xhci_setup_one_noop(struct xhci_hcd *xhci) |
7f84eef0 SS |
1885 | { |
1886 | if (queue_cmd_noop(xhci) < 0) | |
1887 | return NULL; | |
1888 | xhci->noops_submitted++; | |
23e3be11 | 1889 | return xhci_ring_cmd_db; |
7f84eef0 | 1890 | } |
3ffbba95 SS |
1891 | |
1892 | /* Queue a slot enable or disable request on the command ring */ | |
23e3be11 | 1893 | int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id) |
3ffbba95 SS |
1894 | { |
1895 | return queue_command(xhci, 0, 0, 0, | |
1896 | TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id)); | |
1897 | } | |
1898 | ||
1899 | /* Queue an address device command TRB */ | |
23e3be11 SS |
1900 | int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, |
1901 | u32 slot_id) | |
3ffbba95 | 1902 | { |
8e595a5d SS |
1903 | return queue_command(xhci, lower_32_bits(in_ctx_ptr), |
1904 | upper_32_bits(in_ctx_ptr), 0, | |
3ffbba95 SS |
1905 | TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id)); |
1906 | } | |
f94e0186 SS |
1907 | |
1908 | /* Queue a configure endpoint command TRB */ | |
23e3be11 SS |
1909 | int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, |
1910 | u32 slot_id) | |
f94e0186 | 1911 | { |
8e595a5d SS |
1912 | return queue_command(xhci, lower_32_bits(in_ctx_ptr), |
1913 | upper_32_bits(in_ctx_ptr), 0, | |
f94e0186 SS |
1914 | TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id)); |
1915 | } | |
ae636747 | 1916 | |
f2217e8e SS |
1917 | /* Queue an evaluate context command TRB */ |
1918 | int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, | |
1919 | u32 slot_id) | |
1920 | { | |
1921 | return queue_command(xhci, lower_32_bits(in_ctx_ptr), | |
1922 | upper_32_bits(in_ctx_ptr), 0, | |
1923 | TRB_TYPE(TRB_EVAL_CONTEXT) | SLOT_ID_FOR_TRB(slot_id)); | |
1924 | } | |
1925 | ||
23e3be11 | 1926 | int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id, |
ae636747 SS |
1927 | unsigned int ep_index) |
1928 | { | |
1929 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1930 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1931 | u32 type = TRB_TYPE(TRB_STOP_RING); | |
1932 | ||
1933 | return queue_command(xhci, 0, 0, 0, | |
1934 | trb_slot_id | trb_ep_index | type); | |
1935 | } | |
1936 | ||
1937 | /* Set Transfer Ring Dequeue Pointer command. | |
1938 | * This should not be used for endpoints that have streams enabled. | |
1939 | */ | |
1940 | static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id, | |
1941 | unsigned int ep_index, struct xhci_segment *deq_seg, | |
1942 | union xhci_trb *deq_ptr, u32 cycle_state) | |
1943 | { | |
1944 | dma_addr_t addr; | |
1945 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1946 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1947 | u32 type = TRB_TYPE(TRB_SET_DEQ); | |
1948 | ||
23e3be11 | 1949 | addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr); |
c92bcfa7 | 1950 | if (addr == 0) { |
ae636747 | 1951 | xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n"); |
700e2052 GKH |
1952 | xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n", |
1953 | deq_seg, deq_ptr); | |
c92bcfa7 SS |
1954 | return 0; |
1955 | } | |
8e595a5d SS |
1956 | return queue_command(xhci, lower_32_bits(addr) | cycle_state, |
1957 | upper_32_bits(addr), 0, | |
ae636747 SS |
1958 | trb_slot_id | trb_ep_index | type); |
1959 | } | |
a1587d97 SS |
1960 | |
1961 | int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id, | |
1962 | unsigned int ep_index) | |
1963 | { | |
1964 | u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id); | |
1965 | u32 trb_ep_index = EP_ID_FOR_TRB(ep_index); | |
1966 | u32 type = TRB_TYPE(TRB_RESET_EP); | |
1967 | ||
1968 | return queue_command(xhci, 0, 0, 0, trb_slot_id | trb_ep_index | type); | |
1969 | } |