summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/mthca/mthca_mr.c
blob: dc3c2346045c205e2a8acd0ff4844a924fb161c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/slab.h>
#include <linux/errno.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"
#include "mthca_memfree.h"

struct mthca_mtt {
	struct mthca_buddy *buddy;
	int                 order;
	u32                 first_seg;
};

/*
 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
 */
struct mthca_mpt_entry {
	__be32 flags;
	__be32 page_size;
	__be32 key;
	__be32 pd;
	__be64 start;
	__be64 length;
	__be32 lkey;
	__be32 window_count;
	__be32 window_count_limit;
	__be64 mtt_seg;
	__be32 mtt_sz;		/* Arbel only */
	u32    reserved[2];
} __attribute__((packed));

#define MTHCA_MPT_FLAG_SW_OWNS       (0xfUL << 28)
#define MTHCA_MPT_FLAG_MIO           (1 << 17)
#define MTHCA_MPT_FLAG_BIND_ENABLE   (1 << 15)
#define MTHCA_MPT_FLAG_PHYSICAL      (1 <<  9)
#define MTHCA_MPT_FLAG_REGION        (1 <<  8)

#define MTHCA_MTT_FLAG_PRESENT       1

#define MTHCA_MPT_STATUS_SW 0xF0
#define MTHCA_MPT_STATUS_HW 0x00

#define SINAI_FMR_KEY_INC 0x1000000

/*
 * Buddy allocator for MTT segments (currently not very efficient
 * since it doesn't keep a free list and just searches linearly
 * through the bitmaps)
 */

static u32 mthca_buddy_alloc(struct mthca_buddy *buddy, int order)
{
	int o;
	int m;
	u32 seg;

	spin_lock(&buddy->lock);

	for (o = order; o <= buddy->max_order; ++o)
		if (buddy->num_free[o]) {
			m = 1 << (buddy->max_order - o);
			seg = find_first_bit(buddy->bits[o], m);
			if (seg < m)
				goto found;
		}

	spin_unlock(&buddy->lock);
	return -1;

 found:
	clear_bit(seg, buddy->bits[o]);
	--buddy->num_free[o];

	while (o > order) {
		--o;
		seg <<= 1;
		set_bit(seg ^ 1, buddy->bits[o]);
		++buddy->num_free[o];
	}

	spin_unlock(&buddy->lock);

	seg <<= order;

	return seg;
}

static void mthca_buddy_free(struct mthca_buddy *buddy, u32 seg, int order)
{
	seg >>= order;

	spin_lock(&buddy->lock);

	while (test_bit(seg ^ 1, buddy->bits[order])) {
		clear_bit(seg ^ 1, buddy->bits[order]);
		--buddy->num_free[order];
		seg >>= 1;
		++order;
	}

	set_bit(seg, buddy->bits[order]);
	++buddy->num_free[order];

	spin_unlock(&buddy->lock);
}

static int mthca_buddy_init(struct mthca_buddy *buddy, int max_order)
{
	int i, s;

	buddy->max_order = max_order;
	spin_lock_init(&buddy->lock);

	buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
			      GFP_KERNEL);
	buddy->num_free = kcalloc((buddy->max_order + 1), sizeof *buddy->num_free,
				  GFP_KERNEL);
	if (!buddy->bits || !buddy->num_free)
		goto err_out;

	for (i = 0; i <= buddy->max_order; ++i) {
		s = BITS_TO_LONGS(1 << (buddy->max_order - i));
		buddy->bits[i] = kmalloc_array(s, sizeof(long), GFP_KERNEL);
		if (!buddy->bits[i])
			goto err_out_free;
		bitmap_zero(buddy->bits[i],
			    1 << (buddy->max_order - i));
	}

	set_bit(0, buddy->bits[buddy->max_order]);
	buddy->num_free[buddy->max_order] = 1;

	return 0;

err_out_free:
	for (i = 0; i <= buddy->max_order; ++i)
		kfree(buddy->bits[i]);

err_out:
	kfree(buddy->bits);
	kfree(buddy->num_free);

	return -ENOMEM;
}

static void mthca_buddy_cleanup(struct mthca_buddy *buddy)
{
	int i;

	for (i = 0; i <= buddy->max_order; ++i)
		kfree(buddy->bits[i]);

	kfree(buddy->bits);
	kfree(buddy->num_free);
}

static u32 mthca_alloc_mtt_range(struct mthca_dev *dev, int order,
				 struct mthca_buddy *buddy)
{
	u32 seg = mthca_buddy_alloc(buddy, order);

	if (seg == -1)
		return -1;

	if (mthca_is_memfree(dev))
		if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
					  seg + (1 << order) - 1)) {
			mthca_buddy_free(buddy, seg, order);
			seg = -1;
		}

	return seg;
}

static struct mthca_mtt *__mthca_alloc_mtt(struct mthca_dev *dev, int size,
					   struct mthca_buddy *buddy)
{
	struct mthca_mtt *mtt;
	int i;

	if (size <= 0)
		return ERR_PTR(-EINVAL);

	mtt = kmalloc(sizeof *mtt, GFP_KERNEL);
	if (!mtt)
		return ERR_PTR(-ENOMEM);

	mtt->buddy = buddy;
	mtt->order = 0;
	for (i = dev->limits.mtt_seg_size / 8; i < size; i <<= 1)
		++mtt->order;

	mtt->first_seg = mthca_alloc_mtt_range(dev, mtt->order, buddy);
	if (mtt->first_seg == -1) {
		kfree(mtt);
		return ERR_PTR(-ENOMEM);
	}

	return mtt;
}

struct mthca_mtt *mthca_alloc_mtt(struct mthca_dev *dev, int size)
{
	return __mthca_alloc_mtt(dev, size, &dev->mr_table.mtt_buddy);
}

void mthca_free_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt)
{
	if (!mtt)
		return;

	mthca_buddy_free(mtt->buddy, mtt->first_seg, mtt->order);

	mthca_table_put_range(dev, dev->mr_table.mtt_table,
			      mtt->first_seg,
			      mtt->first_seg + (1 << mtt->order) - 1);

	kfree(mtt);
}

static int __mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
			     int start_index, u64 *buffer_list, int list_len)
{
	struct mthca_mailbox *mailbox;
	__be64 *mtt_entry;
	int err = 0;
	int i;

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	mtt_entry = mailbox->buf;

	while (list_len > 0) {
		mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
					   mtt->first_seg * dev->limits.mtt_seg_size +
					   start_index * 8);
		mtt_entry[1] = 0;
		for (i = 0; i < list_len && i < MTHCA_MAILBOX_SIZE / 8 - 2; ++i)
			mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
						       MTHCA_MTT_FLAG_PRESENT);

		/*
		 * If we have an odd number of entries to write, add
		 * one more dummy entry for firmware efficiency.
		 */
		if (i & 1)
			mtt_entry[i + 2] = 0;

		err = mthca_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
		if (err) {
			mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
			goto out;
		}

		list_len    -= i;
		start_index += i;
		buffer_list += i;
	}

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_write_mtt_size(struct mthca_dev *dev)
{
	if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
	    !(dev->mthca_flags & MTHCA_FLAG_FMR))
		/*
		 * Be friendly to WRITE_MTT command
		 * and leave two empty slots for the
		 * index and reserved fields of the
		 * mailbox.
		 */
		return PAGE_SIZE / sizeof (u64) - 2;

	/* For Arbel, all MTTs must fit in the same page. */
	return mthca_is_memfree(dev) ? (PAGE_SIZE / sizeof (u64)) : 0x7ffffff;
}

static void mthca_tavor_write_mtt_seg(struct mthca_dev *dev,
				      struct mthca_mtt *mtt, int start_index,
				      u64 *buffer_list, int list_len)
{
	u64 __iomem *mtts;
	int i;

	mtts = dev->mr_table.tavor_fmr.mtt_base + mtt->first_seg * dev->limits.mtt_seg_size +
		start_index * sizeof (u64);
	for (i = 0; i < list_len; ++i)
		mthca_write64_raw(cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT),
				  mtts + i);
}

static void mthca_arbel_write_mtt_seg(struct mthca_dev *dev,
				      struct mthca_mtt *mtt, int start_index,
				      u64 *buffer_list, int list_len)
{
	__be64 *mtts;
	dma_addr_t dma_handle;
	int i;
	int s = start_index * sizeof (u64);

	/* For Arbel, all MTTs must fit in the same page. */
	BUG_ON(s / PAGE_SIZE != (s + list_len * sizeof(u64) - 1) / PAGE_SIZE);
	/* Require full segments */
	BUG_ON(s % dev->limits.mtt_seg_size);

	mtts = mthca_table_find(dev->mr_table.mtt_table, mtt->first_seg +
				s / dev->limits.mtt_seg_size, &dma_handle);

	BUG_ON(!mtts);

	dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
				list_len * sizeof (u64), DMA_TO_DEVICE);

	for (i = 0; i < list_len; ++i)
		mtts[i] = cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT);

	dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
				   list_len * sizeof (u64), DMA_TO_DEVICE);
}

int mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
		    int start_index, u64 *buffer_list, int list_len)
{
	int size = mthca_write_mtt_size(dev);
	int chunk;

	if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
	    !(dev->mthca_flags & MTHCA_FLAG_FMR))
		return __mthca_write_mtt(dev, mtt, start_index, buffer_list, list_len);

	while (list_len > 0) {
		chunk = min(size, list_len);
		if (mthca_is_memfree(dev))
			mthca_arbel_write_mtt_seg(dev, mtt, start_index,
						  buffer_list, chunk);
		else
			mthca_tavor_write_mtt_seg(dev, mtt, start_index,
						  buffer_list, chunk);

		list_len    -= chunk;
		start_index += chunk;
		buffer_list += chunk;
	}

	return 0;
}

static inline u32 tavor_hw_index_to_key(u32 ind)
{
	return ind;
}

static inline u32 tavor_key_to_hw_index(u32 key)
{
	return key;
}

static inline u32 arbel_hw_index_to_key(u32 ind)
{
	return (ind >> 24) | (ind << 8);
}

static inline u32 arbel_key_to_hw_index(u32 key)
{
	return (key << 24) | (key >> 8);
}

static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
{
	if (mthca_is_memfree(dev))
		return arbel_hw_index_to_key(ind);
	else
		return tavor_hw_index_to_key(ind);
}

static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
{
	if (mthca_is_memfree(dev))
		return arbel_key_to_hw_index(key);
	else
		return tavor_key_to_hw_index(key);
}

static inline u32 adjust_key(struct mthca_dev *dev, u32 key)
{
	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
		return ((key << 20) & 0x800000) | (key & 0x7fffff);
	else
		return key;
}

int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift,
		   u64 iova, u64 total_size, u32 access, struct mthca_mr *mr)
{
	struct mthca_mailbox *mailbox;
	struct mthca_mpt_entry *mpt_entry;
	u32 key;
	int i;
	int err;

	WARN_ON(buffer_size_shift >= 32);

	key = mthca_alloc(&dev->mr_table.mpt_alloc);
	if (key == -1)
		return -ENOMEM;
	key = adjust_key(dev, key);
	mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

	if (mthca_is_memfree(dev)) {
		err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
		if (err)
			goto err_out_mpt_free;
	}

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox)) {
		err = PTR_ERR(mailbox);
		goto err_out_table;
	}
	mpt_entry = mailbox->buf;

	mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
				       MTHCA_MPT_FLAG_MIO         |
				       MTHCA_MPT_FLAG_REGION      |
				       access);
	if (!mr->mtt)
		mpt_entry->flags |= cpu_to_be32(MTHCA_MPT_FLAG_PHYSICAL);

	mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
	mpt_entry->key       = cpu_to_be32(key);
	mpt_entry->pd        = cpu_to_be32(pd);
	mpt_entry->start     = cpu_to_be64(iova);
	mpt_entry->length    = cpu_to_be64(total_size);

	memset(&mpt_entry->lkey, 0,
	       sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));

	if (mr->mtt)
		mpt_entry->mtt_seg =
			cpu_to_be64(dev->mr_table.mtt_base +
				    mr->mtt->first_seg * dev->limits.mtt_seg_size);

	if (0) {
		mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
		for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
			if (i % 4 == 0)
				printk("[%02x] ", i * 4);
			printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
			if ((i + 1) % 4 == 0)
				printk("\n");
		}
	}

	err = mthca_SW2HW_MPT(dev, mailbox,
			      key & (dev->limits.num_mpts - 1));
	if (err) {
		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
		goto err_out_mailbox;
	}

	mthca_free_mailbox(dev, mailbox);
	return err;

err_out_mailbox:
	mthca_free_mailbox(dev, mailbox);

err_out_table:
	mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
	mthca_free(&dev->mr_table.mpt_alloc, key);
	return err;
}

int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
			   u32 access, struct mthca_mr *mr)
{
	mr->mtt = NULL;
	return mthca_mr_alloc(dev, pd, 12, 0, ~0ULL, access, mr);
}

int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
			u64 *buffer_list, int buffer_size_shift,
			int list_len, u64 iova, u64 total_size,
			u32 access, struct mthca_mr *mr)
{
	int err;

	mr->mtt = mthca_alloc_mtt(dev, list_len);
	if (IS_ERR(mr->mtt))
		return PTR_ERR(mr->mtt);

	err = mthca_write_mtt(dev, mr->mtt, 0, buffer_list, list_len);
	if (err) {
		mthca_free_mtt(dev, mr->mtt);
		return err;
	}

	err = mthca_mr_alloc(dev, pd, buffer_size_shift, iova,
			     total_size, access, mr);
	if (err)
		mthca_free_mtt(dev, mr->mtt);

	return err;
}

/* Free mr or fmr */
static void mthca_free_region(struct mthca_dev *dev, u32 lkey)
{
	mthca_table_put(dev, dev->mr_table.mpt_table,
			key_to_hw_index(dev, lkey));

	mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, lkey));
}

void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
{
	int err;

	err = mthca_HW2SW_MPT(dev, NULL,
			      key_to_hw_index(dev, mr->ibmr.lkey) &
			      (dev->limits.num_mpts - 1));
	if (err)
		mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);

	mthca_free_region(dev, mr->ibmr.lkey);
	mthca_free_mtt(dev, mr->mtt);
}

int mthca_fmr_alloc(struct mthca_dev *dev, u32 pd,
		    u32 access, struct mthca_fmr *mr)
{
	struct mthca_mpt_entry *mpt_entry;
	struct mthca_mailbox *mailbox;
	u64 mtt_seg;
	u32 key, idx;
	int list_len = mr->attr.max_pages;
	int err = -ENOMEM;
	int i;

	if (mr->attr.page_shift < 12 || mr->attr.page_shift >= 32)
		return -EINVAL;

	/* For Arbel, all MTTs must fit in the same page. */
	if (mthca_is_memfree(dev) &&
	    mr->attr.max_pages * sizeof *mr->mem.arbel.mtts > PAGE_SIZE)
		return -EINVAL;

	mr->maps = 0;

	key = mthca_alloc(&dev->mr_table.mpt_alloc);
	if (key == -1)
		return -ENOMEM;
	key = adjust_key(dev, key);

	idx = key & (dev->limits.num_mpts - 1);
	mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

	if (mthca_is_memfree(dev)) {
		err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
		if (err)
			goto err_out_mpt_free;

		mr->mem.arbel.mpt = mthca_table_find(dev->mr_table.mpt_table, key, NULL);
		BUG_ON(!mr->mem.arbel.mpt);
	} else
		mr->mem.tavor.mpt = dev->mr_table.tavor_fmr.mpt_base +
			sizeof *(mr->mem.tavor.mpt) * idx;

	mr->mtt = __mthca_alloc_mtt(dev, list_len, dev->mr_table.fmr_mtt_buddy);
	if (IS_ERR(mr->mtt)) {
		err = PTR_ERR(mr->mtt);
		goto err_out_table;
	}

	mtt_seg = mr->mtt->first_seg * dev->limits.mtt_seg_size;

	if (mthca_is_memfree(dev)) {
		mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
						      mr->mtt->first_seg,
						      &mr->mem.arbel.dma_handle);
		BUG_ON(!mr->mem.arbel.mtts);
	} else
		mr->mem.tavor.mtts = dev->mr_table.tavor_fmr.mtt_base + mtt_seg;

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox)) {
		err = PTR_ERR(mailbox);
		goto err_out_free_mtt;
	}

	mpt_entry = mailbox->buf;

	mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
				       MTHCA_MPT_FLAG_MIO         |
				       MTHCA_MPT_FLAG_REGION      |
				       access);

	mpt_entry->page_size = cpu_to_be32(mr->attr.page_shift - 12);
	mpt_entry->key       = cpu_to_be32(key);
	mpt_entry->pd        = cpu_to_be32(pd);
	memset(&mpt_entry->start, 0,
	       sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, start));
	mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base + mtt_seg);

	if (0) {
		mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
		for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
			if (i % 4 == 0)
				printk("[%02x] ", i * 4);
			printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
			if ((i + 1) % 4 == 0)
				printk("\n");
		}
	}

	err = mthca_SW2HW_MPT(dev, mailbox,
			      key & (dev->limits.num_mpts - 1));
	if (err) {
		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
		goto err_out_mailbox_free;
	}

	mthca_free_mailbox(dev, mailbox);
	return 0;

err_out_mailbox_free:
	mthca_free_mailbox(dev, mailbox);

err_out_free_mtt:
	mthca_free_mtt(dev, mr->mtt);

err_out_table:
	mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
	mthca_free(&dev->mr_table.mpt_alloc, key);
	return err;
}

int mthca_free_fmr(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	if (fmr->maps)
		return -EBUSY;

	mthca_free_region(dev, fmr->ibmr.lkey);
	mthca_free_mtt(dev, fmr->mtt);

	return 0;
}

static inline int mthca_check_fmr(struct mthca_fmr *fmr, u64 *page_list,
				  int list_len, u64 iova)
{
	int i, page_mask;

	if (list_len > fmr->attr.max_pages)
		return -EINVAL;

	page_mask = (1 << fmr->attr.page_shift) - 1;

	/* We are getting page lists, so va must be page aligned. */
	if (iova & page_mask)
		return -EINVAL;

	/* Trust the user not to pass misaligned data in page_list */
	if (0)
		for (i = 0; i < list_len; ++i) {
			if (page_list[i] & ~page_mask)
				return -EINVAL;
		}

	if (fmr->maps >= fmr->attr.max_maps)
		return -EINVAL;

	return 0;
}


int mthca_tavor_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
			     int list_len, u64 iova)
{
	struct mthca_fmr *fmr = to_mfmr(ibfmr);
	struct mthca_dev *dev = to_mdev(ibfmr->device);
	struct mthca_mpt_entry mpt_entry;
	u32 key;
	int i, err;

	err = mthca_check_fmr(fmr, page_list, list_len, iova);
	if (err)
		return err;

	++fmr->maps;

	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
	key += dev->limits.num_mpts;
	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);

	for (i = 0; i < list_len; ++i) {
		__be64 mtt_entry = cpu_to_be64(page_list[i] |
					       MTHCA_MTT_FLAG_PRESENT);
		mthca_write64_raw(mtt_entry, fmr->mem.tavor.mtts + i);
	}

	mpt_entry.lkey   = cpu_to_be32(key);
	mpt_entry.length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
	mpt_entry.start  = cpu_to_be64(iova);

	__raw_writel((__force u32) mpt_entry.lkey, &fmr->mem.tavor.mpt->key);
	memcpy_toio(&fmr->mem.tavor.mpt->start, &mpt_entry.start,
		    offsetof(struct mthca_mpt_entry, window_count) -
		    offsetof(struct mthca_mpt_entry, start));

	writeb(MTHCA_MPT_STATUS_HW, fmr->mem.tavor.mpt);

	return 0;
}

int mthca_arbel_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
			     int list_len, u64 iova)
{
	struct mthca_fmr *fmr = to_mfmr(ibfmr);
	struct mthca_dev *dev = to_mdev(ibfmr->device);
	u32 key;
	int i, err;

	err = mthca_check_fmr(fmr, page_list, list_len, iova);
	if (err)
		return err;

	++fmr->maps;

	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
		key += SINAI_FMR_KEY_INC;
	else
		key += dev->limits.num_mpts;
	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;

	wmb();

	dma_sync_single_for_cpu(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
				list_len * sizeof(u64), DMA_TO_DEVICE);

	for (i = 0; i < list_len; ++i)
		fmr->mem.arbel.mtts[i] = cpu_to_be64(page_list[i] |
						     MTHCA_MTT_FLAG_PRESENT);

	dma_sync_single_for_device(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
				   list_len * sizeof(u64), DMA_TO_DEVICE);

	fmr->mem.arbel.mpt->key    = cpu_to_be32(key);
	fmr->mem.arbel.mpt->lkey   = cpu_to_be32(key);
	fmr->mem.arbel.mpt->length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
	fmr->mem.arbel.mpt->start  = cpu_to_be64(iova);

	wmb();

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_HW;

	wmb();

	return 0;
}

void mthca_tavor_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	if (!fmr->maps)
		return;

	fmr->maps = 0;

	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
}

void mthca_arbel_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	if (!fmr->maps)
		return;

	fmr->maps = 0;

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
}

int mthca_init_mr_table(struct mthca_dev *dev)
{
	phys_addr_t addr;
	int mpts, mtts, err, i;

	err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
			       dev->limits.num_mpts,
			       ~0, dev->limits.reserved_mrws);
	if (err)
		return err;

	if (!mthca_is_memfree(dev) &&
	    (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN))
		dev->limits.fmr_reserved_mtts = 0;
	else
		dev->mthca_flags |= MTHCA_FLAG_FMR;

	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
		mthca_dbg(dev, "Memory key throughput optimization activated.\n");

	err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
			       fls(dev->limits.num_mtt_segs - 1));

	if (err)
		goto err_mtt_buddy;

	dev->mr_table.tavor_fmr.mpt_base = NULL;
	dev->mr_table.tavor_fmr.mtt_base = NULL;

	if (dev->limits.fmr_reserved_mtts) {
		i = fls(dev->limits.fmr_reserved_mtts - 1);

		if (i >= 31) {
			mthca_warn(dev, "Unable to reserve 2^31 FMR MTTs.\n");
			err = -EINVAL;
			goto err_fmr_mpt;
		}
		mpts = mtts = 1 << i;
	} else {
		mtts = dev->limits.num_mtt_segs;
		mpts = dev->limits.num_mpts;
	}

	if (!mthca_is_memfree(dev) &&
	    (dev->mthca_flags & MTHCA_FLAG_FMR)) {

		addr = pci_resource_start(dev->pdev, 4) +
			((pci_resource_len(dev->pdev, 4) - 1) &
			 dev->mr_table.mpt_base);

		dev->mr_table.tavor_fmr.mpt_base =
			ioremap(addr, mpts * sizeof(struct mthca_mpt_entry));

		if (!dev->mr_table.tavor_fmr.mpt_base) {
			mthca_warn(dev, "MPT ioremap for FMR failed.\n");
			err = -ENOMEM;
			goto err_fmr_mpt;
		}

		addr = pci_resource_start(dev->pdev, 4) +
			((pci_resource_len(dev->pdev, 4) - 1) &
			 dev->mr_table.mtt_base);

		dev->mr_table.tavor_fmr.mtt_base =
			ioremap(addr, mtts * dev->limits.mtt_seg_size);
		if (!dev->mr_table.tavor_fmr.mtt_base) {
			mthca_warn(dev, "MTT ioremap for FMR failed.\n");
			err = -ENOMEM;
			goto err_fmr_mtt;
		}
	}

	if (dev->limits.fmr_reserved_mtts) {
		err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, fls(mtts - 1));
		if (err)
			goto err_fmr_mtt_buddy;

		/* Prevent regular MRs from using FMR keys */
		err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, fls(mtts - 1));
		if (err)
			goto err_reserve_fmr;

		dev->mr_table.fmr_mtt_buddy =
			&dev->mr_table.tavor_fmr.mtt_buddy;
	} else
		dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;

	/* FMR table is always the first, take reserved MTTs out of there */
	if (dev->limits.reserved_mtts) {
		i = fls(dev->limits.reserved_mtts - 1);

		if (mthca_alloc_mtt_range(dev, i,
					  dev->mr_table.fmr_mtt_buddy) == -1) {
			mthca_warn(dev, "MTT table of order %d is too small.\n",
				  dev->mr_table.fmr_mtt_buddy->max_order);
			err = -ENOMEM;
			goto err_reserve_mtts;
		}
	}

	return 0;

err_reserve_mtts:
err_reserve_fmr:
	if (dev->limits.fmr_reserved_mtts)
		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

err_fmr_mtt_buddy:
	if (dev->mr_table.tavor_fmr.mtt_base)
		iounmap(dev->mr_table.tavor_fmr.mtt_base);

err_fmr_mtt:
	if (dev->mr_table.tavor_fmr.mpt_base)
		iounmap(dev->mr_table.tavor_fmr.mpt_base);

err_fmr_mpt:
	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

err_mtt_buddy:
	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);

	return err;
}

void mthca_cleanup_mr_table(struct mthca_dev *dev)
{
	/* XXX check if any MRs are still allocated? */
	if (dev->limits.fmr_reserved_mtts)
		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

	if (dev->mr_table.tavor_fmr.mtt_base)
		iounmap(dev->mr_table.tavor_fmr.mtt_base);
	if (dev->mr_table.tavor_fmr.mpt_base)
		iounmap(dev->mr_table.tavor_fmr.mpt_base);

	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
}