aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/ehea/ehea_qmr.c
blob: 9d006878f0459db1dfe30c079639638ae2025fcf (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
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
/*
 *  linux/drivers/net/ehea/ehea_qmr.c
 *
 *  eHEA ethernet device driver for IBM eServer System p
 *
 *  (C) Copyright IBM Corp. 2006
 *
 *  Authors:
 *       Christoph Raisch <raisch@de.ibm.com>
 *       Jan-Bernd Themann <themann@de.ibm.com>
 *       Thomas Klein <tklein@de.ibm.com>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/mm.h>
#include "ehea.h"
#include "ehea_phyp.h"
#include "ehea_qmr.h"

struct ehea_bmap *ehea_bmap = NULL;



static void *hw_qpageit_get_inc(struct hw_queue *queue)
{
	void *retvalue = hw_qeit_get(queue);

	queue->current_q_offset += queue->pagesize;
	if (queue->current_q_offset > queue->queue_length) {
		queue->current_q_offset -= queue->pagesize;
		retvalue = NULL;
	} else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
		ehea_error("not on pageboundary");
		retvalue = NULL;
	}
	return retvalue;
}

static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
			  const u32 pagesize, const u32 qe_size)
{
	int pages_per_kpage = PAGE_SIZE / pagesize;
	int i, k;

	if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
		ehea_error("pagesize conflict! kernel pagesize=%d, "
			   "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
		return -EINVAL;
	}

	queue->queue_length = nr_of_pages * pagesize;
	queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
	if (!queue->queue_pages) {
		ehea_error("no mem for queue_pages");
		return -ENOMEM;
	}

	/*
	 * allocate pages for queue:
	 * outer loop allocates whole kernel pages (page aligned) and
	 * inner loop divides a kernel page into smaller hea queue pages
	 */
	i = 0;
	while (i < nr_of_pages) {
		u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
		if (!kpage)
			goto out_nomem;
		for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
			(queue->queue_pages)[i] = (struct ehea_page *)kpage;
			kpage += pagesize;
			i++;
		}
	}

	queue->current_q_offset = 0;
	queue->qe_size = qe_size;
	queue->pagesize = pagesize;
	queue->toggle_state = 1;

	return 0;
out_nomem:
	for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
		if (!(queue->queue_pages)[i])
			break;
		free_page((unsigned long)(queue->queue_pages)[i]);
	}
	return -ENOMEM;
}

static void hw_queue_dtor(struct hw_queue *queue)
{
	int pages_per_kpage = PAGE_SIZE / queue->pagesize;
	int i, nr_pages;

	if (!queue || !queue->queue_pages)
		return;

	nr_pages = queue->queue_length / queue->pagesize;

	for (i = 0; i < nr_pages; i += pages_per_kpage)
		free_page((unsigned long)(queue->queue_pages)[i]);

	kfree(queue->queue_pages);
}

struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
			       int nr_of_cqe, u64 eq_handle, u32 cq_token)
{
	struct ehea_cq *cq;
	struct h_epa epa;
	u64 *cq_handle_ref, hret, rpage;
	u32 act_nr_of_entries, act_pages, counter;
	int ret;
	void *vpage;

	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
	if (!cq) {
		ehea_error("no mem for cq");
		goto out_nomem;
	}

	cq->attr.max_nr_of_cqes = nr_of_cqe;
	cq->attr.cq_token = cq_token;
	cq->attr.eq_handle = eq_handle;

	cq->adapter = adapter;

	cq_handle_ref = &cq->fw_handle;
	act_nr_of_entries = 0;
	act_pages = 0;

	hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
					&cq->fw_handle, &cq->epas);
	if (hret != H_SUCCESS) {
		ehea_error("alloc_resource_cq failed");
		goto out_freemem;
	}

	ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
			    EHEA_PAGESIZE, sizeof(struct ehea_cqe));
	if (ret)
		goto out_freeres;

	for (counter = 0; counter < cq->attr.nr_pages; counter++) {
		vpage = hw_qpageit_get_inc(&cq->hw_queue);
		if (!vpage) {
			ehea_error("hw_qpageit_get_inc failed");
			goto out_kill_hwq;
		}

		rpage = virt_to_abs(vpage);
		hret = ehea_h_register_rpage(adapter->handle,
					     0, EHEA_CQ_REGISTER_ORIG,
					     cq->fw_handle, rpage, 1);
		if (hret < H_SUCCESS) {
			ehea_error("register_rpage_cq failed ehea_cq=%p "
				   "hret=%lx counter=%i act_pages=%i",
				   cq, hret, counter, cq->attr.nr_pages);
			goto out_kill_hwq;
		}

		if (counter == (cq->attr.nr_pages - 1)) {
			vpage = hw_qpageit_get_inc(&cq->hw_queue);

			if ((hret != H_SUCCESS) || (vpage)) {
				ehea_error("registration of pages not "
					   "complete hret=%lx\n", hret);
				goto out_kill_hwq;
			}
		} else {
			if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
				ehea_error("CQ: registration of page failed "
					   "hret=%lx\n", hret);
				goto out_kill_hwq;
			}
		}
	}

	hw_qeit_reset(&cq->hw_queue);
	epa = cq->epas.kernel;
	ehea_reset_cq_ep(cq);
	ehea_reset_cq_n1(cq);

	return cq;

out_kill_hwq:
	hw_queue_dtor(&cq->hw_queue);

out_freeres:
	ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);

out_freemem:
	kfree(cq);

out_nomem:
	return NULL;
}

u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
{
	u64 hret;
	u64 adapter_handle = cq->adapter->handle;

	/* deregister all previous registered pages */
	hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
	if (hret != H_SUCCESS)
		return hret;

	hw_queue_dtor(&cq->hw_queue);
	kfree(cq);

	return hret;
}

int ehea_destroy_cq(struct ehea_cq *cq)
{
	u64 hret;
	if (!cq)
		return 0;

	hcp_epas_dtor(&cq->epas);
	hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
	if (hret == H_R_STATE) {
		ehea_error_data(cq->adapter, cq->fw_handle);
		hret = ehea_destroy_cq_res(cq, FORCE_FREE);
	}

	if (hret != H_SUCCESS) {
		ehea_error("destroy CQ failed");
		return -EIO;
	}

	return 0;
}

struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
			       const enum ehea_eq_type type,
			       const u32 max_nr_of_eqes, const u8 eqe_gen)
{
	int ret, i;
	u64 hret, rpage;
	void *vpage;
	struct ehea_eq *eq;

	eq = kzalloc(sizeof(*eq), GFP_KERNEL);
	if (!eq) {
		ehea_error("no mem for eq");
		return NULL;
	}

	eq->adapter = adapter;
	eq->attr.type = type;
	eq->attr.max_nr_of_eqes = max_nr_of_eqes;
	eq->attr.eqe_gen = eqe_gen;
	spin_lock_init(&eq->spinlock);

	hret = ehea_h_alloc_resource_eq(adapter->handle,
					&eq->attr, &eq->fw_handle);
	if (hret != H_SUCCESS) {
		ehea_error("alloc_resource_eq failed");
		goto out_freemem;
	}

	ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
			    EHEA_PAGESIZE, sizeof(struct ehea_eqe));
	if (ret) {
		ehea_error("can't allocate eq pages");
		goto out_freeres;
	}

	for (i = 0; i < eq->attr.nr_pages; i++) {
		vpage = hw_qpageit_get_inc(&eq->hw_queue);
		if (!vpage) {
			ehea_error("hw_qpageit_get_inc failed");
			hret = H_RESOURCE;
			goto out_kill_hwq;
		}

		rpage = virt_to_abs(vpage);

		hret = ehea_h_register_rpage(adapter->handle, 0,
					     EHEA_EQ_REGISTER_ORIG,
					     eq->fw_handle, rpage, 1);

		if (i == (eq->attr.nr_pages - 1)) {
			/* last page */
			vpage = hw_qpageit_get_inc(&eq->hw_queue);
			if ((hret != H_SUCCESS) || (vpage))
				goto out_kill_hwq;

		} else {
			if ((hret != H_PAGE_REGISTERED) || (!vpage))
				goto out_kill_hwq;

		}
	}

	hw_qeit_reset(&eq->hw_queue);
	return eq;

out_kill_hwq:
	hw_queue_dtor(&eq->hw_queue);

out_freeres:
	ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);

out_freemem:
	kfree(eq);
	return NULL;
}

struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
{
	struct ehea_eqe *eqe;
	unsigned long flags;

	spin_lock_irqsave(&eq->spinlock, flags);
	eqe = (struct ehea_eqe *)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
	spin_unlock_irqrestore(&eq->spinlock, flags);

	return eqe;
}

u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
{
	u64 hret;
	unsigned long flags;

	spin_lock_irqsave(&eq->spinlock, flags);

	hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
	spin_unlock_irqrestore(&eq->spinlock, flags);

	if (hret != H_SUCCESS)
		return hret;

	hw_queue_dtor(&eq->hw_queue);
	kfree(eq);

	return hret;
}

int ehea_destroy_eq(struct ehea_eq *eq)
{
	u64 hret;
	if (!eq)
		return 0;

	hcp_epas_dtor(&eq->epas);

	hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
	if (hret == H_R_STATE) {
		ehea_error_data(eq->adapter, eq->fw_handle);
		hret = ehea_destroy_eq_res(eq, FORCE_FREE);
	}

	if (hret != H_SUCCESS) {
		ehea_error("destroy EQ failed");
		return -EIO;
	}

	return 0;
}

/**
 * allocates memory for a queue and registers pages in phyp
 */
int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
			   int nr_pages, int wqe_size, int act_nr_sges,
			   struct ehea_adapter *adapter, int h_call_q_selector)
{
	u64 hret, rpage;
	int ret, cnt;
	void *vpage;

	ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
	if (ret)
		return ret;

	for (cnt = 0; cnt < nr_pages; cnt++) {
		vpage = hw_qpageit_get_inc(hw_queue);
		if (!vpage) {
			ehea_error("hw_qpageit_get_inc failed");
			goto out_kill_hwq;
		}
		rpage = virt_to_abs(vpage);
		hret = ehea_h_register_rpage(adapter->handle,
					     0, h_call_q_selector,
					     qp->fw_handle, rpage, 1);
		if (hret < H_SUCCESS) {
			ehea_error("register_rpage_qp failed");
			goto out_kill_hwq;
		}
	}
	hw_qeit_reset(hw_queue);
	return 0;

out_kill_hwq:
	hw_queue_dtor(hw_queue);
	return -EIO;
}

static inline u32 map_wqe_size(u8 wqe_enc_size)
{
	return 128 << wqe_enc_size;
}

struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
			       u32 pd, struct ehea_qp_init_attr *init_attr)
{
	int ret;
	u64 hret;
	struct ehea_qp *qp;
	u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
	u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;


	qp = kzalloc(sizeof(*qp), GFP_KERNEL);
	if (!qp) {
		ehea_error("no mem for qp");
		return NULL;
	}

	qp->adapter = adapter;

	hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
					&qp->fw_handle, &qp->epas);
	if (hret != H_SUCCESS) {
		ehea_error("ehea_h_alloc_resource_qp failed");
		goto out_freemem;
	}

	wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
	wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
	wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
	wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);

	ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
				     wqe_size_in_bytes_sq,
				     init_attr->act_wqe_size_enc_sq, adapter,
				     0);
	if (ret) {
		ehea_error("can't register for sq ret=%x", ret);
		goto out_freeres;
	}

	ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
				     init_attr->nr_rq1_pages,
				     wqe_size_in_bytes_rq1,
				     init_attr->act_wqe_size_enc_rq1,
				     adapter, 1);
	if (ret) {
		ehea_error("can't register for rq1 ret=%x", ret);
		goto out_kill_hwsq;
	}

	if (init_attr->rq_count > 1) {
		ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
					     init_attr->nr_rq2_pages,
					     wqe_size_in_bytes_rq2,
					     init_attr->act_wqe_size_enc_rq2,
					     adapter, 2);
		if (ret) {
			ehea_error("can't register for rq2 ret=%x", ret);
			goto out_kill_hwr1q;
		}
	}

	if (init_attr->rq_count > 2) {
		ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
					     init_attr->nr_rq3_pages,
					     wqe_size_in_bytes_rq3,
					     init_attr->act_wqe_size_enc_rq3,
					     adapter, 3);
		if (ret) {
			ehea_error("can't register for rq3 ret=%x", ret);
			goto out_kill_hwr2q;
		}
	}

	qp->init_attr = *init_attr;

	return qp;

out_kill_hwr2q:
	hw_queue_dtor(&qp->hw_rqueue2);

out_kill_hwr1q:
	hw_queue_dtor(&qp->hw_rqueue1);

out_kill_hwsq:
	hw_queue_dtor(&qp->hw_squeue);

out_freeres:
	ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
	ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);

out_freemem:
	kfree(qp);
	return NULL;
}

u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
{
	u64 hret;
	struct ehea_qp_init_attr *qp_attr = &qp->init_attr;


	ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
	hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
	if (hret != H_SUCCESS)
		return hret;

	hw_queue_dtor(&qp->hw_squeue);
	hw_queue_dtor(&qp->hw_rqueue1);

	if (qp_attr->rq_count > 1)
		hw_queue_dtor(&qp->hw_rqueue2);
	if (qp_attr->rq_count > 2)
		hw_queue_dtor(&qp->hw_rqueue3);
	kfree(qp);

	return hret;
}

int ehea_destroy_qp(struct ehea_qp *qp)
{
	u64 hret;
	if (!qp)
		return 0;

	hcp_epas_dtor(&qp->epas);

	hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
	if (hret == H_R_STATE) {
		ehea_error_data(qp->adapter, qp->fw_handle);
		hret = ehea_destroy_qp_res(qp, FORCE_FREE);
	}

	if (hret != H_SUCCESS) {
		ehea_error("destroy QP failed");
		return -EIO;
	}

	return 0;
}

static inline int ehea_calc_index(unsigned long i, unsigned long s)
{
	return (i >> s) & EHEA_INDEX_MASK;
}

static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
				     int dir)
{
	if (!ehea_top_bmap->dir[dir]) {
		ehea_top_bmap->dir[dir] =
			kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
		if (!ehea_top_bmap->dir[dir])
			return -ENOMEM;
	}
	return 0;
}

static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
{
	if (!ehea_bmap->top[top]) {
		ehea_bmap->top[top] =
			kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
		if (!ehea_bmap->top[top])
			return -ENOMEM;
	}
	return ehea_init_top_bmap(ehea_bmap->top[top], dir);
}

static DEFINE_MUTEX(ehea_busmap_mutex);
static unsigned long ehea_mr_len;

#define EHEA_BUSMAP_ADD_SECT 1
#define EHEA_BUSMAP_REM_SECT 0

static void ehea_rebuild_busmap(void)
{
	u64 vaddr = EHEA_BUSMAP_START;
	int top, dir, idx;

	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
		struct ehea_top_bmap *ehea_top;
		int valid_dir_entries = 0;

		if (!ehea_bmap->top[top])
			continue;
		ehea_top = ehea_bmap->top[top];
		for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
			struct ehea_dir_bmap *ehea_dir;
			int valid_entries = 0;

			if (!ehea_top->dir[dir])
				continue;
			valid_dir_entries++;
			ehea_dir = ehea_top->dir[dir];
			for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
				if (!ehea_dir->ent[idx])
					continue;
				valid_entries++;
				ehea_dir->ent[idx] = vaddr;
				vaddr += EHEA_SECTSIZE;
			}
			if (!valid_entries) {
				ehea_top->dir[dir] = NULL;
				kfree(ehea_dir);
			}
		}
		if (!valid_dir_entries) {
			ehea_bmap->top[top] = NULL;
			kfree(ehea_top);
		}
	}
}

static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
{
	unsigned long i, start_section, end_section;

	if (!nr_pages)
		return 0;

	if (!ehea_bmap) {
		ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
		if (!ehea_bmap)
			return -ENOMEM;
	}

	start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
	end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
	/* Mark entries as valid or invalid only; address is assigned later */
	for (i = start_section; i < end_section; i++) {
		u64 flag;
		int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
		int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
		int idx = i & EHEA_INDEX_MASK;
		
		if (add) {
			int ret = ehea_init_bmap(ehea_bmap, top, dir);
			if (ret)
				return ret;
			flag = 1; /* valid */
			ehea_mr_len += EHEA_SECTSIZE;
		} else {
			if (!ehea_bmap->top[top])
				continue;
			if (!ehea_bmap->top[top]->dir[dir])
				continue;
			flag = 0; /* invalid */
			ehea_mr_len -= EHEA_SECTSIZE;
		}

		ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
	}
	ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
	return 0;
}

int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
{
	int ret;

	mutex_lock(&ehea_busmap_mutex);
	ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
	mutex_unlock(&ehea_busmap_mutex);
	return ret;
}

int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
{
	int ret;

	mutex_lock(&ehea_busmap_mutex);
	ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
	mutex_unlock(&ehea_busmap_mutex);
	return ret;
}

static int ehea_is_hugepage(unsigned long pfn)
{
	int page_order;

	if (pfn & EHEA_HUGEPAGE_PFN_MASK)
		return 0;

	page_order = compound_order(pfn_to_page(pfn));
	if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
		return 0;

	return 1;
}

static int ehea_create_busmap_callback(unsigned long initial_pfn,
				       unsigned long total_nr_pages, void *arg)
{
	int ret;
	unsigned long pfn, start_pfn, end_pfn, nr_pages;

	if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
		return ehea_update_busmap(initial_pfn, total_nr_pages,
					  EHEA_BUSMAP_ADD_SECT);

	/* Given chunk is >= 16GB -> check for hugepages */
	start_pfn = initial_pfn;
	end_pfn = initial_pfn + total_nr_pages;
	pfn = start_pfn;

	while (pfn < end_pfn) {
		if (ehea_is_hugepage(pfn)) {
			/* Add mem found in front of the hugepage */
			nr_pages = pfn - start_pfn;
			ret = ehea_update_busmap(start_pfn, nr_pages,
						 EHEA_BUSMAP_ADD_SECT);
			if (ret)
				return ret;

			/* Skip the hugepage */
			pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
			start_pfn = pfn;
		} else
			pfn += (EHEA_SECTSIZE / PAGE_SIZE);
	}

	/* Add mem found behind the hugepage(s)  */
	nr_pages = pfn - start_pfn;
	return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
}

int ehea_create_busmap(void)
{
	int ret;

	mutex_lock(&ehea_busmap_mutex);
	ehea_mr_len = 0;
	ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
				   ehea_create_busmap_callback);
	mutex_unlock(&ehea_busmap_mutex);
	return ret;
}

void ehea_destroy_busmap(void)
{
	int top, dir;
	mutex_lock(&ehea_busmap_mutex);
	if (!ehea_bmap)
		goto out_destroy;

	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
		if (!ehea_bmap->top[top])
			continue;

		for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
			if (!ehea_bmap->top[top]->dir[dir])
				continue;

			kfree(ehea_bmap->top[top]->dir[dir]);
		}

		kfree(ehea_bmap->top[top]);
	}

	kfree(ehea_bmap);
	ehea_bmap = NULL;
out_destroy:	
	mutex_unlock(&ehea_busmap_mutex);
}

u64 ehea_map_vaddr(void *caddr)
{
	int top, dir, idx;
	unsigned long index, offset;

	if (!ehea_bmap)
		return EHEA_INVAL_ADDR;

	index = virt_to_abs(caddr) >> SECTION_SIZE_BITS;
	top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
	if (!ehea_bmap->top[top])
		return EHEA_INVAL_ADDR;

	dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
	if (!ehea_bmap->top[top]->dir[dir])
		return EHEA_INVAL_ADDR;

	idx = index & EHEA_INDEX_MASK;
	if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
		return EHEA_INVAL_ADDR;

	offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
	return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
}

static inline void *ehea_calc_sectbase(int top, int dir, int idx)
{
	unsigned long ret = idx;
	ret |= dir << EHEA_DIR_INDEX_SHIFT;
	ret |= top << EHEA_TOP_INDEX_SHIFT;
	return abs_to_virt(ret << SECTION_SIZE_BITS);
}

static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
			       struct ehea_adapter *adapter,
			       struct ehea_mr *mr)
{
	void *pg;
	u64 j, m, hret;
	unsigned long k = 0;
	u64 pt_abs = virt_to_abs(pt);

	void *sectbase = ehea_calc_sectbase(top, dir, idx);

	for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {

		for (m = 0; m < EHEA_MAX_RPAGE; m++) {
			pg = sectbase + ((k++) * EHEA_PAGESIZE);
			pt[m] = virt_to_abs(pg);
		}
		hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
						0, pt_abs, EHEA_MAX_RPAGE);

		if ((hret != H_SUCCESS)
		    && (hret != H_PAGE_REGISTERED)) {
			ehea_h_free_resource(adapter->handle, mr->handle,
					     FORCE_FREE);
			ehea_error("register_rpage_mr failed");
			return hret;
		}
	}
	return hret;
}

static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
				struct ehea_adapter *adapter,
				struct ehea_mr *mr)
{
	u64 hret = H_SUCCESS;
	int idx;

	for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
		if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
			continue;
		
		hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
			    	return hret;
	}
	return hret;
}

static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
				    struct ehea_adapter *adapter,
				    struct ehea_mr *mr)
{
	u64 hret = H_SUCCESS;
	int dir;

	for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
		if (!ehea_bmap->top[top]->dir[dir])
			continue;

		hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
			    	return hret;
	}
	return hret;
}

int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
{
	int ret;
	u64 *pt;
	u64 hret;
	u32 acc_ctrl = EHEA_MR_ACC_CTRL;

	unsigned long top;

	pt = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (!pt) {
		ehea_error("no mem");
		ret = -ENOMEM;
		goto out;
	}

	hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
					ehea_mr_len, acc_ctrl, adapter->pd,
					&mr->handle, &mr->lkey);

	if (hret != H_SUCCESS) {
		ehea_error("alloc_resource_mr failed");
		ret = -EIO;
		goto out;
	}

	if (!ehea_bmap) {
		ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
		ehea_error("no busmap available");
		ret = -EIO;
		goto out;
	}

	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
		if (!ehea_bmap->top[top])
			continue;

		hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
		if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
			break;
	}

	if (hret != H_SUCCESS) {
		ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
		ehea_error("registering mr failed");
		ret = -EIO;
		goto out;
	}

	mr->vaddr = EHEA_BUSMAP_START;
	mr->adapter = adapter;
	ret = 0;
out:
	kfree(pt);
	return ret;
}

int ehea_rem_mr(struct ehea_mr *mr)
{
	u64 hret;

	if (!mr || !mr->adapter)
		return -EINVAL;

	hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
				    FORCE_FREE);
	if (hret != H_SUCCESS) {
		ehea_error("destroy MR failed");
		return -EIO;
	}

	return 0;
}

int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
		 struct ehea_mr *shared_mr)
{
	u64 hret;

	hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
				   old_mr->vaddr, EHEA_MR_ACC_CTRL,
				   adapter->pd, shared_mr);
	if (hret != H_SUCCESS)
		return -EIO;

	shared_mr->adapter = adapter;

	return 0;
}

void print_error_data(u64 *data)
{
	int length;
	u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
	u64 resource = data[1];

	length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);

	if (length > EHEA_PAGESIZE)
		length = EHEA_PAGESIZE;

	if (type == 0x8) /* Queue Pair */
		ehea_error("QP (resource=%lX) state: AER=0x%lX, AERR=0x%lX, "
			   "port=%lX", resource, data[6], data[12], data[22]);

	if (type == 0x4) /* Completion Queue */
		ehea_error("CQ (resource=%lX) state: AER=0x%lX", resource,
			   data[6]);

	if (type == 0x3) /* Event Queue */
		ehea_error("EQ (resource=%lX) state: AER=0x%lX", resource,
			   data[6]);

	ehea_dump(data, length, "error data");
}

void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle)
{
	unsigned long ret;
	u64 *rblock;

	rblock = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (!rblock) {
		ehea_error("Cannot allocate rblock memory.");
		return;
	}

	ret = ehea_h_error_data(adapter->handle,
				res_handle,
				rblock);

	if (ret == H_R_STATE)
		ehea_error("No error data is available: %lX.", res_handle);
	else if (ret == H_SUCCESS)
		print_error_data(rblock);
	else
		ehea_error("Error data could not be fetched: %lX", res_handle);

	kfree(rblock);
}