Merge HEAD from ../scsi-misc-2.6-old
[linux-2.6] / drivers / infiniband / hw / mthca / mthca_srq.c
1 /*
2  * Copyright (c) 2005 Cisco Systems. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  * $Id: mthca_srq.c 3047 2005-08-10 03:59:35Z roland $
33  */
34
35 #include "mthca_dev.h"
36 #include "mthca_cmd.h"
37 #include "mthca_memfree.h"
38 #include "mthca_wqe.h"
39
40 enum {
41         MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE
42 };
43
44 struct mthca_tavor_srq_context {
45         __be64 wqe_base_ds;     /* low 6 bits is descriptor size */
46         __be32 state_pd;
47         __be32 lkey;
48         __be32 uar;
49         __be32 wqe_cnt;
50         u32    reserved[2];
51 };
52
53 struct mthca_arbel_srq_context {
54         __be32 state_logsize_srqn;
55         __be32 lkey;
56         __be32 db_index;
57         __be32 logstride_usrpage;
58         __be64 wqe_base;
59         __be32 eq_pd;
60         __be16 limit_watermark;
61         __be16 wqe_cnt;
62         u16    reserved1;
63         __be16 wqe_counter;
64         u32    reserved2[3];
65 };
66
67 static void *get_wqe(struct mthca_srq *srq, int n)
68 {
69         if (srq->is_direct)
70                 return srq->queue.direct.buf + (n << srq->wqe_shift);
71         else
72                 return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf +
73                         ((n << srq->wqe_shift) & (PAGE_SIZE - 1));
74 }
75
76 /*
77  * Return a pointer to the location within a WQE that we're using as a
78  * link when the WQE is in the free list.  We use an offset of 4
79  * because in the Tavor case, posting a WQE may overwrite the first
80  * four bytes of the previous WQE.  The offset avoids corrupting our
81  * free list if the WQE has already completed and been put on the free
82  * list when we post the next WQE.
83  */
84 static inline int *wqe_to_link(void *wqe)
85 {
86         return (int *) (wqe + 4);
87 }
88
89 static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
90                                          struct mthca_pd *pd,
91                                          struct mthca_srq *srq,
92                                          struct mthca_tavor_srq_context *context)
93 {
94         memset(context, 0, sizeof *context);
95
96         context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4));
97         context->state_pd    = cpu_to_be32(pd->pd_num);
98         context->lkey        = cpu_to_be32(srq->mr.ibmr.lkey);
99
100         if (pd->ibpd.uobject)
101                 context->uar =
102                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
103         else
104                 context->uar = cpu_to_be32(dev->driver_uar.index);
105 }
106
107 static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
108                                          struct mthca_pd *pd,
109                                          struct mthca_srq *srq,
110                                          struct mthca_arbel_srq_context *context)
111 {
112         int logsize;
113
114         memset(context, 0, sizeof *context);
115
116         logsize = long_log2(srq->max) + srq->wqe_shift;
117         context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
118         context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
119         context->db_index = cpu_to_be32(srq->db_index);
120         context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29);
121         if (pd->ibpd.uobject)
122                 context->logstride_usrpage |=
123                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
124         else
125                 context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index);
126         context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num);
127 }
128
129 static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq)
130 {
131         mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue,
132                        srq->is_direct, &srq->mr);
133         kfree(srq->wrid);
134 }
135
136 static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
137                                struct mthca_srq *srq)
138 {
139         struct mthca_data_seg *scatter;
140         void *wqe;
141         int err;
142         int i;
143
144         if (pd->ibpd.uobject)
145                 return 0;
146
147         srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
148         if (!srq->wrid)
149                 return -ENOMEM;
150
151         err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift,
152                               MTHCA_MAX_DIRECT_SRQ_SIZE,
153                               &srq->queue, &srq->is_direct, pd, 1, &srq->mr);
154         if (err) {
155                 kfree(srq->wrid);
156                 return err;
157         }
158
159         /*
160          * Now initialize the SRQ buffer so that all of the WQEs are
161          * linked into the list of free WQEs.  In addition, set the
162          * scatter list L_Keys to the sentry value of 0x100.
163          */
164         for (i = 0; i < srq->max; ++i) {
165                 wqe = get_wqe(srq, i);
166
167                 *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1;
168
169                 for (scatter = wqe + sizeof (struct mthca_next_seg);
170                      (void *) scatter < wqe + (1 << srq->wqe_shift);
171                      ++scatter)
172                         scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
173         }
174
175         srq->last = get_wqe(srq, srq->max - 1);
176
177         return 0;
178 }
179
180 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
181                     struct ib_srq_attr *attr, struct mthca_srq *srq)
182 {
183         struct mthca_mailbox *mailbox;
184         u8 status;
185         int ds;
186         int err;
187
188         /* Sanity check SRQ size before proceeding */
189         if (attr->max_wr > 16 << 20 || attr->max_sge > 64)
190                 return -EINVAL;
191
192         srq->max      = attr->max_wr;
193         srq->max_gs   = attr->max_sge;
194         srq->counter  = 0;
195
196         if (mthca_is_memfree(dev))
197                 srq->max = roundup_pow_of_two(srq->max + 1);
198
199         ds = min(64UL,
200                  roundup_pow_of_two(sizeof (struct mthca_next_seg) +
201                                     srq->max_gs * sizeof (struct mthca_data_seg)));
202         srq->wqe_shift = long_log2(ds);
203
204         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
205         if (srq->srqn == -1)
206                 return -ENOMEM;
207
208         if (mthca_is_memfree(dev)) {
209                 err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
210                 if (err)
211                         goto err_out;
212
213                 if (!pd->ibpd.uobject) {
214                         srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
215                                                        srq->srqn, &srq->db);
216                         if (srq->db_index < 0) {
217                                 err = -ENOMEM;
218                                 goto err_out_icm;
219                         }
220                 }
221         }
222
223         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
224         if (IS_ERR(mailbox)) {
225                 err = PTR_ERR(mailbox);
226                 goto err_out_db;
227         }
228
229         err = mthca_alloc_srq_buf(dev, pd, srq);
230         if (err)
231                 goto err_out_mailbox;
232
233         spin_lock_init(&srq->lock);
234         atomic_set(&srq->refcount, 1);
235         init_waitqueue_head(&srq->wait);
236
237         if (mthca_is_memfree(dev))
238                 mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
239         else
240                 mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
241
242         err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status);
243
244         if (err) {
245                 mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
246                 goto err_out_free_buf;
247         }
248         if (status) {
249                 mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n",
250                            status);
251                 err = -EINVAL;
252                 goto err_out_free_buf;
253         }
254
255         spin_lock_irq(&dev->srq_table.lock);
256         if (mthca_array_set(&dev->srq_table.srq,
257                             srq->srqn & (dev->limits.num_srqs - 1),
258                             srq)) {
259                 spin_unlock_irq(&dev->srq_table.lock);
260                 goto err_out_free_srq;
261         }
262         spin_unlock_irq(&dev->srq_table.lock);
263
264         mthca_free_mailbox(dev, mailbox);
265
266         srq->first_free = 0;
267         srq->last_free  = srq->max - 1;
268
269         return 0;
270
271 err_out_free_srq:
272         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
273         if (err)
274                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
275         else if (status)
276                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
277
278 err_out_free_buf:
279         if (!pd->ibpd.uobject)
280                 mthca_free_srq_buf(dev, srq);
281
282 err_out_mailbox:
283         mthca_free_mailbox(dev, mailbox);
284
285 err_out_db:
286         if (!pd->ibpd.uobject && mthca_is_memfree(dev))
287                 mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
288
289 err_out_icm:
290         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
291
292 err_out:
293         mthca_free(&dev->srq_table.alloc, srq->srqn);
294
295         return err;
296 }
297
298 void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
299 {
300         struct mthca_mailbox *mailbox;
301         int err;
302         u8 status;
303
304         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
305         if (IS_ERR(mailbox)) {
306                 mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
307                 return;
308         }
309
310         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
311         if (err)
312                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
313         else if (status)
314                 mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
315
316         spin_lock_irq(&dev->srq_table.lock);
317         mthca_array_clear(&dev->srq_table.srq,
318                           srq->srqn & (dev->limits.num_srqs - 1));
319         spin_unlock_irq(&dev->srq_table.lock);
320
321         atomic_dec(&srq->refcount);
322         wait_event(srq->wait, !atomic_read(&srq->refcount));
323
324         if (!srq->ibsrq.uobject) {
325                 mthca_free_srq_buf(dev, srq);
326                 if (mthca_is_memfree(dev))
327                         mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
328         }
329
330         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
331         mthca_free(&dev->srq_table.alloc, srq->srqn);
332         mthca_free_mailbox(dev, mailbox);
333 }
334
335 void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
336                      enum ib_event_type event_type)
337 {
338         struct mthca_srq *srq;
339         struct ib_event event;
340
341         spin_lock(&dev->srq_table.lock);
342         srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
343         if (srq)
344                 atomic_inc(&srq->refcount);
345         spin_unlock(&dev->srq_table.lock);
346
347         if (!srq) {
348                 mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
349                 return;
350         }
351
352         if (!srq->ibsrq.event_handler)
353                 goto out;
354
355         event.device      = &dev->ib_dev;
356         event.event       = event_type;
357         event.element.srq  = &srq->ibsrq;
358         srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
359
360 out:
361         if (atomic_dec_and_test(&srq->refcount))
362                 wake_up(&srq->wait);
363 }
364
365 /*
366  * This function must be called with IRQs disabled.
367  */
368 void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
369 {
370         int ind;
371
372         ind = wqe_addr >> srq->wqe_shift;
373
374         spin_lock(&srq->lock);
375
376         if (likely(srq->first_free >= 0))
377                 *wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
378         else
379                 srq->first_free = ind;
380
381         *wqe_to_link(get_wqe(srq, ind)) = -1;
382         srq->last_free = ind;
383
384         spin_unlock(&srq->lock);
385 }
386
387 int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
388                               struct ib_recv_wr **bad_wr)
389 {
390         struct mthca_dev *dev = to_mdev(ibsrq->device);
391         struct mthca_srq *srq = to_msrq(ibsrq);
392         unsigned long flags;
393         int err = 0;
394         int first_ind;
395         int ind;
396         int next_ind;
397         int nreq;
398         int i;
399         void *wqe;
400         void *prev_wqe;
401
402         spin_lock_irqsave(&srq->lock, flags);
403
404         first_ind = srq->first_free;
405
406         for (nreq = 0; wr; ++nreq, wr = wr->next) {
407                 ind = srq->first_free;
408
409                 if (ind < 0) {
410                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
411                         err = -ENOMEM;
412                         *bad_wr = wr;
413                         break;
414                 }
415
416                 wqe       = get_wqe(srq, ind);
417                 next_ind  = *wqe_to_link(wqe);
418                 prev_wqe  = srq->last;
419                 srq->last = wqe;
420
421                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
422                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
423                 /* flags field will always remain 0 */
424
425                 wqe += sizeof (struct mthca_next_seg);
426
427                 if (unlikely(wr->num_sge > srq->max_gs)) {
428                         err = -EINVAL;
429                         *bad_wr = wr;
430                         srq->last = prev_wqe;
431                         break;
432                 }
433
434                 for (i = 0; i < wr->num_sge; ++i) {
435                         ((struct mthca_data_seg *) wqe)->byte_count =
436                                 cpu_to_be32(wr->sg_list[i].length);
437                         ((struct mthca_data_seg *) wqe)->lkey =
438                                 cpu_to_be32(wr->sg_list[i].lkey);
439                         ((struct mthca_data_seg *) wqe)->addr =
440                                 cpu_to_be64(wr->sg_list[i].addr);
441                         wqe += sizeof (struct mthca_data_seg);
442                 }
443
444                 if (i < srq->max_gs) {
445                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
446                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
447                         ((struct mthca_data_seg *) wqe)->addr = 0;
448                 }
449
450                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
451                         cpu_to_be32((ind << srq->wqe_shift) | 1);
452                 wmb();
453                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
454                         cpu_to_be32(MTHCA_NEXT_DBD);
455
456                 srq->wrid[ind]  = wr->wr_id;
457                 srq->first_free = next_ind;
458         }
459
460         if (likely(nreq)) {
461                 __be32 doorbell[2];
462
463                 doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
464                 doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);
465
466                 /*
467                  * Make sure that descriptors are written before
468                  * doorbell is rung.
469                  */
470                 wmb();
471
472                 mthca_write64(doorbell,
473                               dev->kar + MTHCA_RECEIVE_DOORBELL,
474                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
475         }
476
477         spin_unlock_irqrestore(&srq->lock, flags);
478         return err;
479 }
480
481 int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
482                               struct ib_recv_wr **bad_wr)
483 {
484         struct mthca_dev *dev = to_mdev(ibsrq->device);
485         struct mthca_srq *srq = to_msrq(ibsrq);
486         unsigned long flags;
487         int err = 0;
488         int ind;
489         int next_ind;
490         int nreq;
491         int i;
492         void *wqe;
493
494         spin_lock_irqsave(&srq->lock, flags);
495
496         for (nreq = 0; wr; ++nreq, wr = wr->next) {
497                 ind = srq->first_free;
498
499                 if (ind < 0) {
500                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
501                         err = -ENOMEM;
502                         *bad_wr = wr;
503                         break;
504                 }
505
506                 wqe       = get_wqe(srq, ind);
507                 next_ind  = *wqe_to_link(wqe);
508
509                 ((struct mthca_next_seg *) wqe)->nda_op =
510                         cpu_to_be32((next_ind << srq->wqe_shift) | 1);
511                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
512                 /* flags field will always remain 0 */
513
514                 wqe += sizeof (struct mthca_next_seg);
515
516                 if (unlikely(wr->num_sge > srq->max_gs)) {
517                         err = -EINVAL;
518                         *bad_wr = wr;
519                         break;
520                 }
521
522                 for (i = 0; i < wr->num_sge; ++i) {
523                         ((struct mthca_data_seg *) wqe)->byte_count =
524                                 cpu_to_be32(wr->sg_list[i].length);
525                         ((struct mthca_data_seg *) wqe)->lkey =
526                                 cpu_to_be32(wr->sg_list[i].lkey);
527                         ((struct mthca_data_seg *) wqe)->addr =
528                                 cpu_to_be64(wr->sg_list[i].addr);
529                         wqe += sizeof (struct mthca_data_seg);
530                 }
531
532                 if (i < srq->max_gs) {
533                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
534                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
535                         ((struct mthca_data_seg *) wqe)->addr = 0;
536                 }
537
538                 srq->wrid[ind]  = wr->wr_id;
539                 srq->first_free = next_ind;
540         }
541
542         if (likely(nreq)) {
543                 srq->counter += nreq;
544
545                 /*
546                  * Make sure that descriptors are written before
547                  * we write doorbell record.
548                  */
549                 wmb();
550                 *srq->db = cpu_to_be32(srq->counter);
551         }
552
553         spin_unlock_irqrestore(&srq->lock, flags);
554         return err;
555 }
556
557 int __devinit mthca_init_srq_table(struct mthca_dev *dev)
558 {
559         int err;
560
561         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
562                 return 0;
563
564         spin_lock_init(&dev->srq_table.lock);
565
566         err = mthca_alloc_init(&dev->srq_table.alloc,
567                                dev->limits.num_srqs,
568                                dev->limits.num_srqs - 1,
569                                dev->limits.reserved_srqs);
570         if (err)
571                 return err;
572
573         err = mthca_array_init(&dev->srq_table.srq,
574                                dev->limits.num_srqs);
575         if (err)
576                 mthca_alloc_cleanup(&dev->srq_table.alloc);
577
578         return err;
579 }
580
581 void __devexit mthca_cleanup_srq_table(struct mthca_dev *dev)
582 {
583         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
584                 return;
585
586         mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
587         mthca_alloc_cleanup(&dev->srq_table.alloc);
588 }