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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/ddi.h>
#include <sys/stat.h>
#include <sys/sunddi.h>
#include <sys/file.h>
#include <sys/open.h>
#include <sys/modctl.h>
#include <sys/ddi_impldefs.h>
#include <sys/sysmacros.h>
#include <sys/ddidevmap.h>
#include <sys/xendev.h>
#include <public/io/protocols.h>
#include <xen/io/blkif_impl.h>
#include "blk_common.h"
/* blk interface status */
enum blk_if_state {
/*
* initial state
*/
BLK_IF_UNKNOWN = 0,
/*
* frontend xenbus state changed to XenbusStateConnected,
* we finally connect
*/
BLK_IF_CONNECTED,
/*
* frontend xenbus state changed to XenbusStateClosed,
* interface disconnected
*/
BLK_IF_DISCONNECTED
};
/* backend device status */
enum blk_be_state {
/* initial state */
BLK_BE_UNKNOWN = 0,
/* backend device is ready (hotplug script finishes successfully) */
BLK_BE_READY
};
/* frontend status */
enum blk_fe_state {
/* initial state */
BLK_FE_UNKNOWN = 0,
/*
* frontend's xenbus state has changed to
* XenbusStateInitialised, is ready for connecting
*/
BLK_FE_READY
};
typedef struct blk_ring_state_s {
kmutex_t rs_mutex;
boolean_t rs_sleeping_on_ring;
boolean_t rs_ring_up;
kcondvar_t rs_cv;
} blk_ring_state_t;
/* Disk Statistics */
static char *blk_stats[] = {
"rd_reqs",
"wr_reqs",
"br_reqs",
"fl_reqs",
"oo_reqs"
};
typedef struct blk_stats_s {
uint64_t bs_req_reads;
uint64_t bs_req_writes;
uint64_t bs_req_barriers;
uint64_t bs_req_flushes;
} blk_stats_t;
struct blk_ring_s {
kmutex_t ri_mutex;
dev_info_t *ri_dip;
kstat_t *ri_kstats;
blk_stats_t ri_stats;
blk_intr_t ri_intr;
caddr_t ri_intr_arg;
blk_ring_cb_t ri_ringup;
caddr_t ri_ringup_arg;
blk_ring_cb_t ri_ringdown;
caddr_t ri_ringdown_arg;
/* blk interface, backend, and frontend status */
enum blk_if_state ri_if_status;
enum blk_be_state ri_be_status;
enum blk_fe_state ri_fe_status;
domid_t ri_fe;
enum blkif_protocol ri_protocol;
size_t ri_nentry;
size_t ri_entrysize;
xendev_ring_t *ri_ring;
blk_ring_state_t ri_state;
};
static void blk_oe_state_change(dev_info_t *dip, ddi_eventcookie_t id,
void *arg, void *impl_data);
static void blk_hp_state_change(dev_info_t *dip, ddi_eventcookie_t id,
void *arg, void *impl_data);
static int blk_check_state_transition(blk_ring_t ring, XenbusState oestate);
static int blk_start_connect(blk_ring_t ring);
static void blk_start_disconnect(blk_ring_t ring);
static void blk_ring_close(blk_ring_t ring);
static int blk_bindto_frontend(blk_ring_t ring);
static void blk_unbindfrom_frontend(blk_ring_t ring);
static uint_t blk_intr(caddr_t arg);
static int blk_kstat_init(blk_ring_t ring);
static void blk_kstat_fini(blk_ring_t ring);
static int blk_kstat_update(kstat_t *ksp, int flag);
static void blk_ring_request_32(blkif_request_t *dst,
blkif_x86_32_request_t *src);
static void blk_ring_request_64(blkif_request_t *dst,
blkif_x86_64_request_t *src);
static void blk_ring_response_32(blkif_x86_32_response_t *dst,
blkif_response_t *src);
static void blk_ring_response_64(blkif_x86_64_response_t *dst,
blkif_response_t *src);
/*
* blk_ring_init()
*/
int
blk_ring_init(blk_ringinit_args_t *args, blk_ring_t *ringp)
{
blk_ring_t ring;
int e;
ring = kmem_zalloc(sizeof (struct blk_ring_s), KM_SLEEP);
mutex_init(&ring->ri_mutex, NULL, MUTEX_DRIVER, NULL);
ring->ri_dip = args->ar_dip;
ring->ri_intr = args->ar_intr;
ring->ri_intr_arg = args->ar_intr_arg;
ring->ri_ringup = args->ar_ringup;
ring->ri_ringup_arg = args->ar_ringup_arg;
ring->ri_ringdown = args->ar_ringdown;
ring->ri_ringdown_arg = args->ar_ringdown_arg;
ring->ri_if_status = BLK_IF_UNKNOWN;
ring->ri_be_status = BLK_BE_UNKNOWN;
ring->ri_fe_status = BLK_FE_UNKNOWN;
ring->ri_state.rs_sleeping_on_ring = B_FALSE;
ring->ri_state.rs_ring_up = B_FALSE;
mutex_init(&ring->ri_state.rs_mutex, NULL, MUTEX_DRIVER, NULL);
cv_init(&ring->ri_state.rs_cv, NULL, CV_DRIVER, NULL);
e = blk_kstat_init(ring);
if (e != DDI_SUCCESS) {
goto ringinitfail_kstat;
}
/* Watch frontend and hotplug state change */
if (xvdi_add_event_handler(ring->ri_dip, XS_OE_STATE,
blk_oe_state_change, ring) != DDI_SUCCESS) {
goto ringinitfail_oestate;
}
if (xvdi_add_event_handler(ring->ri_dip, XS_HP_STATE,
blk_hp_state_change, ring) != DDI_SUCCESS) {
goto ringinitfail_hpstate;
}
/*
* Kick-off hotplug script
*/
if (xvdi_post_event(ring->ri_dip, XEN_HP_ADD) != DDI_SUCCESS) {
cmn_err(CE_WARN, "blk@%s: failed to start hotplug script",
ddi_get_name_addr(ring->ri_dip));
goto ringinitfail_postevent;
}
/*
* start waiting for hotplug event and otherend state event
* mainly for debugging, frontend will not take any op seeing this
*/
(void) xvdi_switch_state(ring->ri_dip, XBT_NULL, XenbusStateInitWait);
*ringp = ring;
return (DDI_SUCCESS);
ringinitfail_postevent:
xvdi_remove_event_handler(ring->ri_dip, XS_HP_STATE);
ringinitfail_hpstate:
xvdi_remove_event_handler(ring->ri_dip, XS_OE_STATE);
ringinitfail_oestate:
blk_kstat_fini(ring);
ringinitfail_kstat:
cv_destroy(&ring->ri_state.rs_cv);
mutex_destroy(&ring->ri_state.rs_mutex);
mutex_destroy(&ring->ri_mutex);
kmem_free(ring, sizeof (struct blk_ring_s));
return (DDI_FAILURE);
}
/*
* blk_ring_fini()
*/
void
blk_ring_fini(blk_ring_t *ringp)
{
blk_ring_t ring;
ring = *ringp;
mutex_enter(&ring->ri_mutex);
if (ring->ri_if_status != BLK_IF_DISCONNECTED) {
blk_ring_close(ring);
}
mutex_exit(&ring->ri_mutex);
xvdi_remove_event_handler(ring->ri_dip, NULL);
blk_kstat_fini(ring);
cv_destroy(&ring->ri_state.rs_cv);
mutex_destroy(&ring->ri_state.rs_mutex);
mutex_destroy(&ring->ri_mutex);
kmem_free(ring, sizeof (struct blk_ring_s));
*ringp = NULL;
}
/*
* blk_kstat_init()
*/
static int
blk_kstat_init(blk_ring_t ring)
{
int nstat = sizeof (blk_stats) / sizeof (blk_stats[0]);
char **cp = blk_stats;
kstat_named_t *knp;
ring->ri_kstats = kstat_create(ddi_get_name(ring->ri_dip),
ddi_get_instance(ring->ri_dip), "req_statistics", "block",
KSTAT_TYPE_NAMED, nstat, 0);
if (ring->ri_kstats == NULL) {
return (DDI_FAILURE);
}
ring->ri_kstats->ks_private = ring;
ring->ri_kstats->ks_update = blk_kstat_update;
knp = ring->ri_kstats->ks_data;
while (nstat > 0) {
kstat_named_init(knp, *cp, KSTAT_DATA_UINT64);
knp++;
cp++;
nstat--;
}
kstat_install(ring->ri_kstats);
return (DDI_SUCCESS);
}
/*
* blk_kstat_fini()
*/
static void
blk_kstat_fini(blk_ring_t ring)
{
kstat_delete(ring->ri_kstats);
}
/*
* blk_kstat_update()
*/
static int
blk_kstat_update(kstat_t *ksp, int flag)
{
kstat_named_t *knp;
blk_stats_t *stats;
blk_ring_t ring;
if (flag != KSTAT_READ) {
return (EACCES);
}
ring = ksp->ks_private;
stats = &ring->ri_stats;
knp = ksp->ks_data;
/*
* Assignment order should match that of the names in
* blk_stats.
*/
(knp++)->value.ui64 = stats->bs_req_reads;
(knp++)->value.ui64 = stats->bs_req_writes;
(knp++)->value.ui64 = stats->bs_req_barriers;
(knp++)->value.ui64 = stats->bs_req_flushes;
(knp++)->value.ui64 = 0; /* oo_req */
return (0);
}
/*
* blk_oe_state_change()
*/
/*ARGSUSED*/
static void
blk_oe_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg,
void *impl_data)
{
XenbusState new_state;
blk_ring_t ring;
ring = (blk_ring_t)arg;
new_state = *(XenbusState *)impl_data;
mutex_enter(&ring->ri_mutex);
if (blk_check_state_transition(ring, new_state) == DDI_FAILURE) {
mutex_exit(&ring->ri_mutex);
return;
}
switch (new_state) {
case XenbusStateInitialised:
ASSERT(ring->ri_if_status == BLK_IF_UNKNOWN);
/* frontend is ready for connecting */
ring->ri_fe_status = BLK_FE_READY;
if (ring->ri_be_status == BLK_BE_READY) {
mutex_exit(&ring->ri_mutex);
if (blk_start_connect(ring) != DDI_SUCCESS)
(void) blk_start_disconnect(ring);
mutex_enter(&ring->ri_mutex);
}
break;
case XenbusStateClosing:
(void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosing);
break;
case XenbusStateClosed:
/* clean up */
(void) xvdi_post_event(ring->ri_dip, XEN_HP_REMOVE);
if (ring->ri_ringdown != NULL) {
(*(ring->ri_ringdown))(ring->ri_ringdown_arg);
}
blk_ring_close(ring);
/* reset state in case of reconnect */
ring->ri_if_status = BLK_IF_UNKNOWN;
ring->ri_be_status = BLK_BE_UNKNOWN;
ring->ri_fe_status = BLK_FE_UNKNOWN;
ring->ri_state.rs_sleeping_on_ring = B_FALSE;
ring->ri_state.rs_ring_up = B_FALSE;
break;
default:
ASSERT(0);
}
mutex_exit(&ring->ri_mutex);
}
/*
* blk_hp_state_change()
*/
/*ARGSUSED*/
static void
blk_hp_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg,
void *impl_data)
{
xendev_hotplug_state_t hpstate;
blk_ring_t ring;
ring = (blk_ring_t)arg;
hpstate = *(xendev_hotplug_state_t *)impl_data;
mutex_enter(&ring->ri_mutex);
if (hpstate == Connected) {
/* Hotplug script has completed successfully */
if (ring->ri_be_status == BLK_BE_UNKNOWN) {
ring->ri_be_status = BLK_BE_READY;
if (ring->ri_fe_status == BLK_FE_READY) {
mutex_exit(&ring->ri_mutex);
/* try to connect to frontend */
if (blk_start_connect(ring) != DDI_SUCCESS)
(void) blk_start_disconnect(ring);
mutex_enter(&ring->ri_mutex);
}
}
}
mutex_exit(&ring->ri_mutex);
}
/*
* blk_check_state_transition()
* check the XenbusState change to see if the change is a valid transition
* or not. The new state is written by frontend domain, or by running
* xenstore-write to change it manually in dom0.
*/
static int
blk_check_state_transition(blk_ring_t ring, XenbusState oestate)
{
switch (ring->ri_if_status) {
case BLK_IF_UNKNOWN:
if (ring->ri_fe_status == BLK_FE_UNKNOWN) {
if ((oestate == XenbusStateUnknown) ||
(oestate == XenbusStateConnected))
goto statechkfail_bug;
else if ((oestate == XenbusStateInitialising) ||
(oestate == XenbusStateInitWait))
goto statechkfail_nop;
} else {
if ((oestate == XenbusStateUnknown) ||
(oestate == XenbusStateInitialising) ||
(oestate == XenbusStateInitWait) ||
(oestate == XenbusStateConnected))
goto statechkfail_bug;
else if (oestate == XenbusStateInitialised)
goto statechkfail_nop;
}
break;
case BLK_IF_CONNECTED:
if ((oestate == XenbusStateUnknown) ||
(oestate == XenbusStateInitialising) ||
(oestate == XenbusStateInitWait) ||
(oestate == XenbusStateInitialised))
goto statechkfail_bug;
else if (oestate == XenbusStateConnected)
goto statechkfail_nop;
break;
case BLK_IF_DISCONNECTED:
default:
goto statechkfail_bug;
}
return (DDI_SUCCESS);
statechkfail_bug:
cmn_err(CE_NOTE, "blk@%s: unexpected otherend "
"state change to %d!, when status is %d",
ddi_get_name_addr(ring->ri_dip), oestate,
ring->ri_if_status);
statechkfail_nop:
return (DDI_FAILURE);
}
/*
* blk_start_connect()
* Kick-off connect process
* If ri_fe_status == BLK_FE_READY and ri_be_status == BLK_BE_READY
* the ri_if_status will be changed to BLK_IF_CONNECTED on success,
* otherwise, ri_if_status will not be changed
*/
static int
blk_start_connect(blk_ring_t ring)
{
xenbus_transaction_t xbt;
dev_info_t *dip;
char *barrier;
char *xsnode;
uint_t len;
int e;
dip = ring->ri_dip;
/*
* Start connect to frontend only when backend device are ready
* and frontend has moved to XenbusStateInitialised, which means
* ready to connect
*/
ASSERT(ring->ri_fe_status == BLK_FE_READY);
ASSERT(ring->ri_be_status == BLK_BE_READY);
xsnode = xvdi_get_xsname(dip);
if (xsnode == NULL) {
goto startconnectfail_get_xsname;
}
ring->ri_fe = xvdi_get_oeid(dip);
if (ring->ri_fe == (domid_t)-1) {
goto startconnectfail_get_oeid;
}
e = xvdi_switch_state(dip, XBT_NULL, XenbusStateInitialised);
if (e > 0) {
goto startconnectfail_switch_init;
}
e = blk_bindto_frontend(ring);
if (e != DDI_SUCCESS) {
goto startconnectfail_bindto_frontend;
}
ring->ri_if_status = BLK_IF_CONNECTED;
e = ddi_add_intr(dip, 0, NULL, NULL, blk_intr, (caddr_t)ring);
if (e != DDI_SUCCESS) {
goto startconnectfail_add_intr;
}
trans_retry:
e = xenbus_transaction_start(&xbt);
if (e != 0) {
xvdi_fatal_error(dip, e, "transaction start");
goto startconnectfail_transaction_start;
}
/* xentop requires the instance in xenstore */
e = xenbus_printf(xbt, xsnode, "instance", "%d",
ddi_get_instance(ring->ri_dip));
if (e != 0) {
cmn_err(CE_WARN, "xdb@%s: failed to write 'instance'",
ddi_get_name_addr(dip));
xvdi_fatal_error(dip, e, "writing 'instance'");
(void) xenbus_transaction_end(xbt, 1);
goto startconnectfail_xenbus_printf;
}
/* If feature-barrier isn't present in xenstore, add it */
e = xenbus_read(xbt, xsnode, "feature-barrier", (void **)&barrier,
&len);
if (e != 0) {
e = xenbus_printf(xbt, xsnode, "feature-barrier", "%d", 1);
if (e != 0) {
cmn_err(CE_WARN, "xdb@%s: failed to write "
"'feature-barrier'", ddi_get_name_addr(dip));
xvdi_fatal_error(dip, e, "writing 'feature-barrier'");
(void) xenbus_transaction_end(xbt, 1);
goto startconnectfail_xenbus_printf;
}
} else {
kmem_free(barrier, len);
}
e = xvdi_switch_state(dip, xbt, XenbusStateConnected);
if (e > 0) {
xvdi_fatal_error(dip, e, "writing 'state'");
(void) xenbus_transaction_end(xbt, 1);
goto startconnectfail_switch_connected;
}
e = xenbus_transaction_end(xbt, 0);
if (e != 0) {
if (e == EAGAIN) {
/* transaction is ended, don't need to abort it */
goto trans_retry;
}
xvdi_fatal_error(dip, e, "completing transaction");
goto startconnectfail_transaction_end;
}
mutex_enter(&ring->ri_state.rs_mutex);
ring->ri_state.rs_ring_up = B_TRUE;
if (ring->ri_state.rs_sleeping_on_ring) {
ring->ri_state.rs_sleeping_on_ring = B_FALSE;
cv_signal(&ring->ri_state.rs_cv);
}
mutex_exit(&ring->ri_state.rs_mutex);
if (ring->ri_ringup != NULL) {
(*(ring->ri_ringup))(ring->ri_ringup_arg);
}
return (DDI_SUCCESS);
startconnectfail_transaction_end:
startconnectfail_switch_connected:
startconnectfail_xenbus_printf:
startconnectfail_transaction_start:
ddi_remove_intr(dip, 0, NULL);
startconnectfail_add_intr:
blk_unbindfrom_frontend(ring);
ring->ri_fe = (domid_t)-1;
startconnectfail_bindto_frontend:
(void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosed);
startconnectfail_switch_init:
startconnectfail_get_oeid:
startconnectfail_get_xsname:
return (DDI_FAILURE);
}
/*
* blk_start_disconnect()
* Kick-off disconnect process. ri_if_status will not be changed
*/
static void
blk_start_disconnect(blk_ring_t ring)
{
/* Kick-off disconnect process */
(void) xvdi_switch_state(ring->ri_dip, XBT_NULL, XenbusStateClosing);
}
/*
* blk_ring_close()
* Disconnect from frontend and close backend device
* ifstatus will be changed to BLK_DISCONNECTED
* Xenbus state will be changed to XenbusStateClosed
*/
static void
blk_ring_close(blk_ring_t ring)
{
dev_info_t *dip;
/* mutex protect ri_if_status only here */
ASSERT(MUTEX_HELD(&ring->ri_mutex));
dip = ring->ri_dip;
if (ring->ri_if_status != BLK_IF_CONNECTED) {
return;
}
ring->ri_if_status = BLK_IF_DISCONNECTED;
mutex_exit(&ring->ri_mutex);
/* stop accepting I/O request from frontend */
ddi_remove_intr(dip, 0, NULL);
blk_unbindfrom_frontend(ring);
ring->ri_fe = (domid_t)-1;
(void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosed);
mutex_enter(&ring->ri_mutex);
}
/*
* blk_bindto_frontend()
*/
static int
blk_bindto_frontend(blk_ring_t ring)
{
evtchn_port_t evtchn;
char protocol[64];
grant_ref_t gref;
dev_info_t *dip;
char *oename;
int e;
dip = ring->ri_dip;
protocol[0] = 0x0;
/*
* Gather info from frontend
*/
oename = xvdi_get_oename(dip);
if (oename == NULL) {
return (DDI_FAILURE);
}
e = xenbus_gather(XBT_NULL, oename, "ring-ref", "%lu", &gref,
"event-channel", "%u", &evtchn, NULL);
if (e != 0) {
xvdi_fatal_error(dip, e,
"Getting ring-ref and evtchn from frontend");
return (DDI_FAILURE);
}
e = xenbus_gather(XBT_NULL, oename, "protocol", "%63s",
protocol, NULL);
if (e != 0) {
(void) strcpy(protocol, "unspecified, assuming native");
} else if (strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) {
ring->ri_protocol = BLKIF_PROTOCOL_NATIVE;
ring->ri_nentry = BLKIF_RING_SIZE;
ring->ri_entrysize = sizeof (union blkif_sring_entry);
} else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
ring->ri_protocol = BLKIF_PROTOCOL_X86_32;
ring->ri_nentry = BLKIF_X86_32_RING_SIZE;
ring->ri_entrysize = sizeof (union blkif_x86_32_sring_entry);
} else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
ring->ri_protocol = BLKIF_PROTOCOL_X86_64;
ring->ri_nentry = BLKIF_X86_64_RING_SIZE;
ring->ri_entrysize = sizeof (union blkif_x86_64_sring_entry);
} else {
xvdi_fatal_error(dip, e, "unknown fe protocol");
return (DDI_FAILURE);
}
/*
* map and init ring
*/
e = xvdi_map_ring(dip, ring->ri_nentry, ring->ri_entrysize, gref,
&ring->ri_ring);
if (e != DDI_SUCCESS) {
return (DDI_FAILURE);
}
/*
* bind event channel
*/
e = xvdi_bind_evtchn(dip, evtchn);
if (e != DDI_SUCCESS) {
xvdi_unmap_ring(ring->ri_ring);
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}
/*
* blk_unbindfrom_frontend()
*/
static void
blk_unbindfrom_frontend(blk_ring_t ring)
{
xvdi_free_evtchn(ring->ri_dip);
xvdi_unmap_ring(ring->ri_ring);
}
/*
* blk_intr()
*/
static uint_t
blk_intr(caddr_t arg)
{
blk_ring_t ring;
ring = (blk_ring_t)arg;
if (ring->ri_if_status != BLK_IF_CONNECTED) {
return (DDI_INTR_CLAIMED);
}
(void) (*ring->ri_intr)(ring->ri_intr_arg);
return (DDI_INTR_CLAIMED);
}
/*
* blk_ring_request_get()
*/
boolean_t
blk_ring_request_get(blk_ring_t ring, blkif_request_t *req)
{
blkif_request_t *src;
blk_stats_t *stats;
mutex_enter(&ring->ri_mutex);
if (ring->ri_if_status != BLK_IF_CONNECTED) {
mutex_exit(&ring->ri_mutex);
return (B_FALSE);
}
src = xvdi_ring_get_request(ring->ri_ring);
if (src == NULL) {
mutex_exit(&ring->ri_mutex);
return (B_FALSE);
}
switch (ring->ri_protocol) {
case BLKIF_PROTOCOL_NATIVE:
bcopy(src, req, sizeof (*req));
break;
case BLKIF_PROTOCOL_X86_32:
blk_ring_request_32(req, (blkif_x86_32_request_t *)src);
break;
case BLKIF_PROTOCOL_X86_64:
blk_ring_request_64(req, (blkif_x86_64_request_t *)src);
break;
default:
cmn_err(CE_WARN, "blkif@%s: unrecognised protocol: %d",
ddi_get_name_addr(ring->ri_dip),
ring->ri_protocol);
}
mutex_exit(&ring->ri_mutex);
stats = &ring->ri_stats;
switch (req->operation) {
case BLKIF_OP_READ:
stats->bs_req_reads++;
break;
case BLKIF_OP_WRITE:
stats->bs_req_writes++;
break;
case BLKIF_OP_WRITE_BARRIER:
stats->bs_req_barriers++;
break;
case BLKIF_OP_FLUSH_DISKCACHE:
stats->bs_req_flushes++;
break;
}
return (B_TRUE);
}
/*
* blk_ring_request_requeue()
* if a request is requeued, caller will have to poll for request
* later.
*/
void
blk_ring_request_requeue(blk_ring_t ring)
{
mutex_enter(&ring->ri_mutex);
if (ring->ri_if_status != BLK_IF_CONNECTED) {
mutex_exit(&ring->ri_mutex);
return;
}
ring->ri_ring->xr_sring.br.req_cons--;
mutex_exit(&ring->ri_mutex);
}
/*
* blk_ring_response_put()
*/
void
blk_ring_response_put(blk_ring_t ring, blkif_response_t *src)
{
blkif_response_t *rsp;
int e;
mutex_enter(&ring->ri_mutex);
if (ring->ri_if_status != BLK_IF_CONNECTED) {
mutex_exit(&ring->ri_mutex);
return;
}
rsp = xvdi_ring_get_response(ring->ri_ring);
ASSERT(rsp);
switch (ring->ri_protocol) {
case BLKIF_PROTOCOL_NATIVE:
bcopy(src, rsp, sizeof (*rsp));
break;
case BLKIF_PROTOCOL_X86_32:
blk_ring_response_32((blkif_x86_32_response_t *)rsp, src);
break;
case BLKIF_PROTOCOL_X86_64:
blk_ring_response_64((blkif_x86_64_response_t *)rsp, src);
break;
default:
cmn_err(CE_WARN, "blk@%s: unrecognised protocol: %d",
ddi_get_name_addr(ring->ri_dip),
ring->ri_protocol);
}
e = xvdi_ring_push_response(ring->ri_ring);
if (e != 0) {
xvdi_notify_oe(ring->ri_dip);
}
mutex_exit(&ring->ri_mutex);
}
/*
* blk_ring_request_32()
*/
static void
blk_ring_request_32(blkif_request_t *dst, blkif_x86_32_request_t *src)
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
dst->operation = src->operation;
dst->nr_segments = src->nr_segments;
dst->handle = src->handle;
dst->id = src->id;
dst->sector_number = src->sector_number;
if (n > src->nr_segments)
n = src->nr_segments;
for (i = 0; i < n; i++)
dst->seg[i] = src->seg[i];
}
/*
* blk_ring_request_64()
*/
static void
blk_ring_request_64(blkif_request_t *dst, blkif_x86_64_request_t *src)
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
dst->operation = src->operation;
dst->nr_segments = src->nr_segments;
dst->handle = src->handle;
dst->id = src->id;
dst->sector_number = src->sector_number;
if (n > src->nr_segments)
n = src->nr_segments;
for (i = 0; i < n; i++)
dst->seg[i] = src->seg[i];
}
/*
* blk_ring_response_32()
*/
static void
blk_ring_response_32(blkif_x86_32_response_t *dst, blkif_response_t *src)
{
dst->id = src->id;
dst->operation = src->operation;
dst->status = src->status;
}
/*
* blk_ring_response_64()
*/
static void
blk_ring_response_64(blkif_x86_64_response_t *dst, blkif_response_t *src)
{
dst->id = src->id;
dst->operation = src->operation;
dst->status = src->status;
}
/*
* blk_ring_request_dump()
*/
void
blk_ring_request_dump(blkif_request_t *req)
{
int i;
/*
* Exploit the public interface definitions for BLKIF_OP_READ
* etc..
*/
char *op_name[] = { "read", "write", "barrier", "flush" };
cmn_err(CE_NOTE, " op=%s", op_name[req->operation]);
cmn_err(CE_NOTE, " num of segments=%d", req->nr_segments);
cmn_err(CE_NOTE, " handle=%d", req->handle);
cmn_err(CE_NOTE, " id=0x%llx", (unsigned long long)req->id);
cmn_err(CE_NOTE, " start sector=%llu",
(unsigned long long)req->sector_number);
for (i = 0; i < req->nr_segments; i++) {
cmn_err(CE_NOTE, " gref=%d, first sec=%d,"
"last sec=%d", req->seg[i].gref, req->seg[i].first_sect,
req->seg[i].last_sect);
}
}
/*
* blk_ring_response_dump()
*/
void
blk_ring_response_dump(blkif_response_t *resp)
{
/*
* Exploit the public interface definitions for BLKIF_OP_READ
* etc..
*/
char *op_name[] = { "read", "write", "barrier", "flush" };
cmn_err(CE_NOTE, " op=%d:%s", resp->operation,
op_name[resp->operation]);
cmn_err(CE_NOTE, " op=%d", resp->operation);
cmn_err(CE_NOTE, " status=%d", resp->status);
}
|