Commit | Line | Data |
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cef1cce5 | 1 | /* |
87427da5 | 2 | * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved. |
cef1cce5 BS |
3 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | #include <linux/err.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
cef1cce5 BS |
36 | #include <linux/vmalloc.h> |
37 | ||
38 | #include "ipath_verbs.h" | |
39 | ||
40 | /** | |
41 | * ipath_cq_enter - add a new entry to the completion queue | |
42 | * @cq: completion queue | |
43 | * @entry: work completion entry to add | |
44 | * @sig: true if @entry is a solicitated entry | |
45 | * | |
373d9915 | 46 | * This may be called with qp->s_lock held. |
cef1cce5 BS |
47 | */ |
48 | void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited) | |
49 | { | |
7a26c474 | 50 | struct ipath_cq_wc *wc; |
cef1cce5 | 51 | unsigned long flags; |
373d9915 | 52 | u32 head; |
cef1cce5 BS |
53 | u32 next; |
54 | ||
55 | spin_lock_irqsave(&cq->lock, flags); | |
56 | ||
373d9915 RC |
57 | /* |
58 | * Note that the head pointer might be writable by user processes. | |
59 | * Take care to verify it is a sane value. | |
60 | */ | |
7a26c474 | 61 | wc = cq->queue; |
373d9915 RC |
62 | head = wc->head; |
63 | if (head >= (unsigned) cq->ibcq.cqe) { | |
64 | head = cq->ibcq.cqe; | |
cef1cce5 | 65 | next = 0; |
373d9915 RC |
66 | } else |
67 | next = head + 1; | |
68 | if (unlikely(next == wc->tail)) { | |
cef1cce5 BS |
69 | spin_unlock_irqrestore(&cq->lock, flags); |
70 | if (cq->ibcq.event_handler) { | |
71 | struct ib_event ev; | |
72 | ||
73 | ev.device = cq->ibcq.device; | |
74 | ev.element.cq = &cq->ibcq; | |
75 | ev.event = IB_EVENT_CQ_ERR; | |
76 | cq->ibcq.event_handler(&ev, cq->ibcq.cq_context); | |
77 | } | |
78 | return; | |
79 | } | |
6cff2faa RC |
80 | if (cq->ip) { |
81 | wc->uqueue[head].wr_id = entry->wr_id; | |
82 | wc->uqueue[head].status = entry->status; | |
83 | wc->uqueue[head].opcode = entry->opcode; | |
84 | wc->uqueue[head].vendor_err = entry->vendor_err; | |
85 | wc->uqueue[head].byte_len = entry->byte_len; | |
00f7ec36 | 86 | wc->uqueue[head].ex.imm_data = (__u32 __force) entry->ex.imm_data; |
6cff2faa RC |
87 | wc->uqueue[head].qp_num = entry->qp->qp_num; |
88 | wc->uqueue[head].src_qp = entry->src_qp; | |
89 | wc->uqueue[head].wc_flags = entry->wc_flags; | |
90 | wc->uqueue[head].pkey_index = entry->pkey_index; | |
91 | wc->uqueue[head].slid = entry->slid; | |
92 | wc->uqueue[head].sl = entry->sl; | |
93 | wc->uqueue[head].dlid_path_bits = entry->dlid_path_bits; | |
94 | wc->uqueue[head].port_num = entry->port_num; | |
95 | /* Make sure entry is written before the head index. */ | |
96 | smp_wmb(); | |
97 | } else | |
98 | wc->kqueue[head] = *entry; | |
373d9915 | 99 | wc->head = next; |
cef1cce5 BS |
100 | |
101 | if (cq->notify == IB_CQ_NEXT_COMP || | |
102 | (cq->notify == IB_CQ_SOLICITED && solicited)) { | |
103 | cq->notify = IB_CQ_NONE; | |
104 | cq->triggered++; | |
105 | /* | |
106 | * This will cause send_complete() to be called in | |
107 | * another thread. | |
108 | */ | |
109 | tasklet_hi_schedule(&cq->comptask); | |
110 | } | |
111 | ||
112 | spin_unlock_irqrestore(&cq->lock, flags); | |
113 | ||
114 | if (entry->status != IB_WC_SUCCESS) | |
115 | to_idev(cq->ibcq.device)->n_wqe_errs++; | |
116 | } | |
117 | ||
118 | /** | |
119 | * ipath_poll_cq - poll for work completion entries | |
120 | * @ibcq: the completion queue to poll | |
121 | * @num_entries: the maximum number of entries to return | |
122 | * @entry: pointer to array where work completions are placed | |
123 | * | |
124 | * Returns the number of completion entries polled. | |
125 | * | |
126 | * This may be called from interrupt context. Also called by ib_poll_cq() | |
127 | * in the generic verbs code. | |
128 | */ | |
129 | int ipath_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry) | |
130 | { | |
131 | struct ipath_cq *cq = to_icq(ibcq); | |
7a26c474 | 132 | struct ipath_cq_wc *wc; |
cef1cce5 BS |
133 | unsigned long flags; |
134 | int npolled; | |
7a26c474 | 135 | u32 tail; |
cef1cce5 | 136 | |
6cff2faa RC |
137 | /* The kernel can only poll a kernel completion queue */ |
138 | if (cq->ip) { | |
139 | npolled = -EINVAL; | |
140 | goto bail; | |
141 | } | |
142 | ||
cef1cce5 BS |
143 | spin_lock_irqsave(&cq->lock, flags); |
144 | ||
7a26c474 BS |
145 | wc = cq->queue; |
146 | tail = wc->tail; | |
147 | if (tail > (u32) cq->ibcq.cqe) | |
148 | tail = (u32) cq->ibcq.cqe; | |
cef1cce5 | 149 | for (npolled = 0; npolled < num_entries; ++npolled, ++entry) { |
7a26c474 | 150 | if (tail == wc->head) |
cef1cce5 | 151 | break; |
6cff2faa RC |
152 | /* The kernel doesn't need a RMB since it has the lock. */ |
153 | *entry = wc->kqueue[tail]; | |
7a26c474 BS |
154 | if (tail >= cq->ibcq.cqe) |
155 | tail = 0; | |
cef1cce5 | 156 | else |
7a26c474 | 157 | tail++; |
cef1cce5 | 158 | } |
7a26c474 | 159 | wc->tail = tail; |
cef1cce5 BS |
160 | |
161 | spin_unlock_irqrestore(&cq->lock, flags); | |
162 | ||
6cff2faa | 163 | bail: |
cef1cce5 BS |
164 | return npolled; |
165 | } | |
166 | ||
167 | static void send_complete(unsigned long data) | |
168 | { | |
169 | struct ipath_cq *cq = (struct ipath_cq *)data; | |
170 | ||
171 | /* | |
172 | * The completion handler will most likely rearm the notification | |
173 | * and poll for all pending entries. If a new completion entry | |
174 | * is added while we are in this routine, tasklet_hi_schedule() | |
175 | * won't call us again until we return so we check triggered to | |
176 | * see if we need to call the handler again. | |
177 | */ | |
178 | for (;;) { | |
179 | u8 triggered = cq->triggered; | |
180 | ||
181 | cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context); | |
182 | ||
183 | if (cq->triggered == triggered) | |
184 | return; | |
185 | } | |
186 | } | |
187 | ||
188 | /** | |
189 | * ipath_create_cq - create a completion queue | |
190 | * @ibdev: the device this completion queue is attached to | |
191 | * @entries: the minimum size of the completion queue | |
192 | * @context: unused by the InfiniPath driver | |
193 | * @udata: unused by the InfiniPath driver | |
194 | * | |
195 | * Returns a pointer to the completion queue or negative errno values | |
196 | * for failure. | |
197 | * | |
198 | * Called by ib_create_cq() in the generic verbs code. | |
199 | */ | |
f4fd0b22 | 200 | struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries, int comp_vector, |
cef1cce5 BS |
201 | struct ib_ucontext *context, |
202 | struct ib_udata *udata) | |
203 | { | |
fe62546a | 204 | struct ipath_ibdev *dev = to_idev(ibdev); |
cef1cce5 | 205 | struct ipath_cq *cq; |
373d9915 | 206 | struct ipath_cq_wc *wc; |
cef1cce5 | 207 | struct ib_cq *ret; |
6cff2faa | 208 | u32 sz; |
cef1cce5 | 209 | |
eae33d47 | 210 | if (entries < 1 || entries > ib_ipath_max_cqes) { |
fe62546a | 211 | ret = ERR_PTR(-EINVAL); |
373d9915 | 212 | goto done; |
fe62546a BS |
213 | } |
214 | ||
373d9915 | 215 | /* Allocate the completion queue structure. */ |
cef1cce5 BS |
216 | cq = kmalloc(sizeof(*cq), GFP_KERNEL); |
217 | if (!cq) { | |
218 | ret = ERR_PTR(-ENOMEM); | |
373d9915 | 219 | goto done; |
cef1cce5 BS |
220 | } |
221 | ||
222 | /* | |
373d9915 RC |
223 | * Allocate the completion queue entries and head/tail pointers. |
224 | * This is allocated separately so that it can be resized and | |
225 | * also mapped into user space. | |
226 | * We need to use vmalloc() in order to support mmap and large | |
227 | * numbers of entries. | |
cef1cce5 | 228 | */ |
6cff2faa RC |
229 | sz = sizeof(*wc); |
230 | if (udata && udata->outlen >= sizeof(__u64)) | |
231 | sz += sizeof(struct ib_uverbs_wc) * (entries + 1); | |
232 | else | |
233 | sz += sizeof(struct ib_wc) * (entries + 1); | |
234 | wc = vmalloc_user(sz); | |
cef1cce5 | 235 | if (!wc) { |
cef1cce5 | 236 | ret = ERR_PTR(-ENOMEM); |
373d9915 | 237 | goto bail_cq; |
cef1cce5 | 238 | } |
373d9915 RC |
239 | |
240 | /* | |
241 | * Return the address of the WC as the offset to mmap. | |
242 | * See ipath_mmap() for details. | |
243 | */ | |
244 | if (udata && udata->outlen >= sizeof(__u64)) { | |
373d9915 RC |
245 | int err; |
246 | ||
6cff2faa | 247 | cq->ip = ipath_create_mmap_info(dev, sz, context, wc); |
6b66b2da RW |
248 | if (!cq->ip) { |
249 | ret = ERR_PTR(-ENOMEM); | |
373d9915 RC |
250 | goto bail_wc; |
251 | } | |
252 | ||
6b66b2da RW |
253 | err = ib_copy_to_udata(udata, &cq->ip->offset, |
254 | sizeof(cq->ip->offset)); | |
255 | if (err) { | |
256 | ret = ERR_PTR(err); | |
257 | goto bail_ip; | |
373d9915 | 258 | } |
373d9915 RC |
259 | } else |
260 | cq->ip = NULL; | |
261 | ||
aa4eaed7 BS |
262 | spin_lock(&dev->n_cqs_lock); |
263 | if (dev->n_cqs_allocated == ib_ipath_max_cqs) { | |
264 | spin_unlock(&dev->n_cqs_lock); | |
265 | ret = ERR_PTR(-ENOMEM); | |
6b66b2da | 266 | goto bail_ip; |
aa4eaed7 BS |
267 | } |
268 | ||
269 | dev->n_cqs_allocated++; | |
270 | spin_unlock(&dev->n_cqs_lock); | |
271 | ||
6b66b2da RW |
272 | if (cq->ip) { |
273 | spin_lock_irq(&dev->pending_lock); | |
274 | list_add(&cq->ip->pending_mmaps, &dev->pending_mmaps); | |
275 | spin_unlock_irq(&dev->pending_lock); | |
276 | } | |
277 | ||
cef1cce5 BS |
278 | /* |
279 | * ib_create_cq() will initialize cq->ibcq except for cq->ibcq.cqe. | |
280 | * The number of entries should be >= the number requested or return | |
281 | * an error. | |
282 | */ | |
283 | cq->ibcq.cqe = entries; | |
284 | cq->notify = IB_CQ_NONE; | |
285 | cq->triggered = 0; | |
286 | spin_lock_init(&cq->lock); | |
287 | tasklet_init(&cq->comptask, send_complete, (unsigned long)cq); | |
373d9915 RC |
288 | wc->head = 0; |
289 | wc->tail = 0; | |
cef1cce5 BS |
290 | cq->queue = wc; |
291 | ||
292 | ret = &cq->ibcq; | |
293 | ||
373d9915 | 294 | goto done; |
fe62546a | 295 | |
6b66b2da RW |
296 | bail_ip: |
297 | kfree(cq->ip); | |
373d9915 RC |
298 | bail_wc: |
299 | vfree(wc); | |
373d9915 RC |
300 | bail_cq: |
301 | kfree(cq); | |
373d9915 | 302 | done: |
cef1cce5 BS |
303 | return ret; |
304 | } | |
305 | ||
306 | /** | |
307 | * ipath_destroy_cq - destroy a completion queue | |
308 | * @ibcq: the completion queue to destroy. | |
309 | * | |
310 | * Returns 0 for success. | |
311 | * | |
312 | * Called by ib_destroy_cq() in the generic verbs code. | |
313 | */ | |
314 | int ipath_destroy_cq(struct ib_cq *ibcq) | |
315 | { | |
fe62546a | 316 | struct ipath_ibdev *dev = to_idev(ibcq->device); |
cef1cce5 BS |
317 | struct ipath_cq *cq = to_icq(ibcq); |
318 | ||
319 | tasklet_kill(&cq->comptask); | |
aa4eaed7 | 320 | spin_lock(&dev->n_cqs_lock); |
fe62546a | 321 | dev->n_cqs_allocated--; |
aa4eaed7 | 322 | spin_unlock(&dev->n_cqs_lock); |
373d9915 RC |
323 | if (cq->ip) |
324 | kref_put(&cq->ip->ref, ipath_release_mmap_info); | |
325 | else | |
326 | vfree(cq->queue); | |
cef1cce5 BS |
327 | kfree(cq); |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | /** | |
333 | * ipath_req_notify_cq - change the notification type for a completion queue | |
334 | * @ibcq: the completion queue | |
ed23a727 | 335 | * @notify_flags: the type of notification to request |
cef1cce5 BS |
336 | * |
337 | * Returns 0 for success. | |
338 | * | |
339 | * This may be called from interrupt context. Also called by | |
340 | * ib_req_notify_cq() in the generic verbs code. | |
341 | */ | |
ed23a727 | 342 | int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags) |
cef1cce5 BS |
343 | { |
344 | struct ipath_cq *cq = to_icq(ibcq); | |
345 | unsigned long flags; | |
ed23a727 | 346 | int ret = 0; |
cef1cce5 BS |
347 | |
348 | spin_lock_irqsave(&cq->lock, flags); | |
349 | /* | |
350 | * Don't change IB_CQ_NEXT_COMP to IB_CQ_SOLICITED but allow | |
373d9915 | 351 | * any other transitions (see C11-31 and C11-32 in ch. 11.4.2.2). |
cef1cce5 BS |
352 | */ |
353 | if (cq->notify != IB_CQ_NEXT_COMP) | |
ed23a727 RD |
354 | cq->notify = notify_flags & IB_CQ_SOLICITED_MASK; |
355 | ||
356 | if ((notify_flags & IB_CQ_REPORT_MISSED_EVENTS) && | |
357 | cq->queue->head != cq->queue->tail) | |
358 | ret = 1; | |
359 | ||
cef1cce5 | 360 | spin_unlock_irqrestore(&cq->lock, flags); |
ed23a727 RD |
361 | |
362 | return ret; | |
cef1cce5 BS |
363 | } |
364 | ||
7a26c474 BS |
365 | /** |
366 | * ipath_resize_cq - change the size of the CQ | |
367 | * @ibcq: the completion queue | |
368 | * | |
369 | * Returns 0 for success. | |
370 | */ | |
cef1cce5 BS |
371 | int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata) |
372 | { | |
373 | struct ipath_cq *cq = to_icq(ibcq); | |
7a26c474 | 374 | struct ipath_cq_wc *old_wc; |
373d9915 RC |
375 | struct ipath_cq_wc *wc; |
376 | u32 head, tail, n; | |
cef1cce5 | 377 | int ret; |
6cff2faa | 378 | u32 sz; |
cef1cce5 | 379 | |
eae33d47 BS |
380 | if (cqe < 1 || cqe > ib_ipath_max_cqes) { |
381 | ret = -EINVAL; | |
382 | goto bail; | |
383 | } | |
384 | ||
cef1cce5 BS |
385 | /* |
386 | * Need to use vmalloc() if we want to support large #s of entries. | |
387 | */ | |
6cff2faa RC |
388 | sz = sizeof(*wc); |
389 | if (udata && udata->outlen >= sizeof(__u64)) | |
390 | sz += sizeof(struct ib_uverbs_wc) * (cqe + 1); | |
391 | else | |
392 | sz += sizeof(struct ib_wc) * (cqe + 1); | |
393 | wc = vmalloc_user(sz); | |
cef1cce5 BS |
394 | if (!wc) { |
395 | ret = -ENOMEM; | |
396 | goto bail; | |
397 | } | |
398 | ||
fb74dacb | 399 | /* Check that we can write the offset to mmap. */ |
373d9915 | 400 | if (udata && udata->outlen >= sizeof(__u64)) { |
fb74dacb | 401 | __u64 offset = 0; |
373d9915 RC |
402 | |
403 | ret = ib_copy_to_udata(udata, &offset, sizeof(offset)); | |
404 | if (ret) | |
a6e7550d | 405 | goto bail_free; |
373d9915 RC |
406 | } |
407 | ||
cef1cce5 | 408 | spin_lock_irq(&cq->lock); |
373d9915 RC |
409 | /* |
410 | * Make sure head and tail are sane since they | |
411 | * might be user writable. | |
412 | */ | |
7a26c474 | 413 | old_wc = cq->queue; |
373d9915 RC |
414 | head = old_wc->head; |
415 | if (head > (u32) cq->ibcq.cqe) | |
416 | head = (u32) cq->ibcq.cqe; | |
417 | tail = old_wc->tail; | |
418 | if (tail > (u32) cq->ibcq.cqe) | |
419 | tail = (u32) cq->ibcq.cqe; | |
420 | if (head < tail) | |
421 | n = cq->ibcq.cqe + 1 + head - tail; | |
cef1cce5 | 422 | else |
373d9915 | 423 | n = head - tail; |
cef1cce5 | 424 | if (unlikely((u32)cqe < n)) { |
733d1281 | 425 | ret = -EINVAL; |
a6e7550d | 426 | goto bail_unlock; |
cef1cce5 | 427 | } |
373d9915 | 428 | for (n = 0; tail != head; n++) { |
6cff2faa RC |
429 | if (cq->ip) |
430 | wc->uqueue[n] = old_wc->uqueue[tail]; | |
431 | else | |
432 | wc->kqueue[n] = old_wc->kqueue[tail]; | |
373d9915 RC |
433 | if (tail == (u32) cq->ibcq.cqe) |
434 | tail = 0; | |
cef1cce5 | 435 | else |
373d9915 | 436 | tail++; |
cef1cce5 BS |
437 | } |
438 | cq->ibcq.cqe = cqe; | |
373d9915 RC |
439 | wc->head = n; |
440 | wc->tail = 0; | |
cef1cce5 BS |
441 | cq->queue = wc; |
442 | spin_unlock_irq(&cq->lock); | |
443 | ||
444 | vfree(old_wc); | |
445 | ||
373d9915 RC |
446 | if (cq->ip) { |
447 | struct ipath_ibdev *dev = to_idev(ibcq->device); | |
448 | struct ipath_mmap_info *ip = cq->ip; | |
449 | ||
6cff2faa | 450 | ipath_update_mmap_info(dev, ip, sz, wc); |
fb74dacb RC |
451 | |
452 | /* | |
453 | * Return the offset to mmap. | |
454 | * See ipath_mmap() for details. | |
455 | */ | |
456 | if (udata && udata->outlen >= sizeof(__u64)) { | |
457 | ret = ib_copy_to_udata(udata, &ip->offset, | |
458 | sizeof(ip->offset)); | |
459 | if (ret) | |
460 | goto bail; | |
461 | } | |
462 | ||
373d9915 | 463 | spin_lock_irq(&dev->pending_lock); |
6b66b2da RW |
464 | if (list_empty(&ip->pending_mmaps)) |
465 | list_add(&ip->pending_mmaps, &dev->pending_mmaps); | |
373d9915 RC |
466 | spin_unlock_irq(&dev->pending_lock); |
467 | } | |
468 | ||
cef1cce5 | 469 | ret = 0; |
a6e7550d | 470 | goto bail; |
cef1cce5 | 471 | |
a6e7550d RC |
472 | bail_unlock: |
473 | spin_unlock_irq(&cq->lock); | |
474 | bail_free: | |
475 | vfree(wc); | |
cef1cce5 BS |
476 | bail: |
477 | return ret; | |
478 | } |