summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/esas2r/esas2r_io.c
blob: a8df916cd57a53eccc356413e26ffbbcda847f9c (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
/*
 *  linux/drivers/scsi/esas2r/esas2r_io.c
 *      For use with ATTO ExpressSAS R6xx SAS/SATA RAID controllers
 *
 *  Copyright (c) 2001-2013 ATTO Technology, Inc.
 *  (mailto:linuxdrivers@attotech.com)mpt3sas/mpt3sas_trigger_diag.
 *
 * 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
 * of the License, 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.
 *
 * NO WARRANTY
 * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 * solely responsible for determining the appropriateness of using and
 * distributing the Program and assumes all risks associated with its
 * exercise of rights under this Agreement, including but not limited to
 * the risks and costs of program errors, damage to or loss of data,
 * programs or equipment, and unavailability or interruption of operations.
 *
 * DISCLAIMER OF LIABILITY
 * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#include "esas2r.h"

void esas2r_start_request(struct esas2r_adapter *a, struct esas2r_request *rq)
{
	struct esas2r_target *t = NULL;
	struct esas2r_request *startrq = rq;
	unsigned long flags;

	if (unlikely(test_bit(AF_DEGRADED_MODE, &a->flags) ||
		     test_bit(AF_POWER_DOWN, &a->flags))) {
		if (rq->vrq->scsi.function == VDA_FUNC_SCSI)
			rq->req_stat = RS_SEL2;
		else
			rq->req_stat = RS_DEGRADED;
	} else if (likely(rq->vrq->scsi.function == VDA_FUNC_SCSI)) {
		t = a->targetdb + rq->target_id;

		if (unlikely(t >= a->targetdb_end
			     || !(t->flags & TF_USED))) {
			rq->req_stat = RS_SEL;
		} else {
			/* copy in the target ID. */
			rq->vrq->scsi.target_id = cpu_to_le16(t->virt_targ_id);

			/*
			 * Test if we want to report RS_SEL for missing target.
			 * Note that if AF_DISC_PENDING is set than this will
			 * go on the defer queue.
			 */
			if (unlikely(t->target_state != TS_PRESENT &&
				     !test_bit(AF_DISC_PENDING, &a->flags)))
				rq->req_stat = RS_SEL;
		}
	}

	if (unlikely(rq->req_stat != RS_PENDING)) {
		esas2r_complete_request(a, rq);
		return;
	}

	esas2r_trace("rq=%p", rq);
	esas2r_trace("rq->vrq->scsi.handle=%x", rq->vrq->scsi.handle);

	if (rq->vrq->scsi.function == VDA_FUNC_SCSI) {
		esas2r_trace("rq->target_id=%d", rq->target_id);
		esas2r_trace("rq->vrq->scsi.flags=%x", rq->vrq->scsi.flags);
	}

	spin_lock_irqsave(&a->queue_lock, flags);

	if (likely(list_empty(&a->defer_list) &&
		   !test_bit(AF_CHPRST_PENDING, &a->flags) &&
		   !test_bit(AF_FLASHING, &a->flags) &&
		   !test_bit(AF_DISC_PENDING, &a->flags)))
		esas2r_local_start_request(a, startrq);
	else
		list_add_tail(&startrq->req_list, &a->defer_list);

	spin_unlock_irqrestore(&a->queue_lock, flags);
}

/*
 * Starts the specified request.  all requests have RS_PENDING set when this
 * routine is called.  The caller is usually esas2r_start_request, but
 * esas2r_do_deferred_processes will start request that are deferred.
 *
 * The caller must ensure that requests can be started.
 *
 * esas2r_start_request will defer a request if there are already requests
 * waiting or there is a chip reset pending.  once the reset condition clears,
 * esas2r_do_deferred_processes will call this function to start the request.
 *
 * When a request is started, it is placed on the active list and queued to
 * the controller.
 */
void esas2r_local_start_request(struct esas2r_adapter *a,
				struct esas2r_request *rq)
{
	esas2r_trace_enter();
	esas2r_trace("rq=%p", rq);
	esas2r_trace("rq->vrq:%p", rq->vrq);
	esas2r_trace("rq->vrq_md->phys_addr:%x", rq->vrq_md->phys_addr);

	if (unlikely(rq->vrq->scsi.function == VDA_FUNC_FLASH
		     && rq->vrq->flash.sub_func == VDA_FLASH_COMMIT))
		set_bit(AF_FLASHING, &a->flags);

	list_add_tail(&rq->req_list, &a->active_list);
	esas2r_start_vda_request(a, rq);
	esas2r_trace_exit();
	return;
}

void esas2r_start_vda_request(struct esas2r_adapter *a,
			      struct esas2r_request *rq)
{
	struct esas2r_inbound_list_source_entry *element;
	u32 dw;

	rq->req_stat = RS_STARTED;
	/*
	 * Calculate the inbound list entry location and the current state of
	 * toggle bit.
	 */
	a->last_write++;
	if (a->last_write >= a->list_size) {
		a->last_write = 0;
		/* update the toggle bit */
		if (test_bit(AF_COMM_LIST_TOGGLE, &a->flags))
			clear_bit(AF_COMM_LIST_TOGGLE, &a->flags);
		else
			set_bit(AF_COMM_LIST_TOGGLE, &a->flags);
	}

	element =
		(struct esas2r_inbound_list_source_entry *)a->inbound_list_md.
		virt_addr
		+ a->last_write;

	/* Set the VDA request size if it was never modified */
	if (rq->vda_req_sz == RQ_SIZE_DEFAULT)
		rq->vda_req_sz = (u16)(a->max_vdareq_size / sizeof(u32));

	element->address = cpu_to_le64(rq->vrq_md->phys_addr);
	element->length = cpu_to_le32(rq->vda_req_sz);

	/* Update the write pointer */
	dw = a->last_write;

	if (test_bit(AF_COMM_LIST_TOGGLE, &a->flags))
		dw |= MU_ILW_TOGGLE;

	esas2r_trace("rq->vrq->scsi.handle:%x", rq->vrq->scsi.handle);
	esas2r_trace("dw:%x", dw);
	esas2r_trace("rq->vda_req_sz:%x", rq->vda_req_sz);
	esas2r_write_register_dword(a, MU_IN_LIST_WRITE, dw);
}

/*
 * Build the scatter/gather list for an I/O request according to the
 * specifications placed in the s/g context.  The caller must initialize
 * context prior to the initial call by calling esas2r_sgc_init().
 */
bool esas2r_build_sg_list_sge(struct esas2r_adapter *a,
			      struct esas2r_sg_context *sgc)
{
	struct esas2r_request *rq = sgc->first_req;
	union atto_vda_req *vrq = rq->vrq;

	while (sgc->length) {
		u32 rem = 0;
		u64 addr;
		u32 len;

		len = (*sgc->get_phys_addr)(sgc, &addr);

		if (unlikely(len == 0))
			return false;

		/* if current length is more than what's left, stop there */
		if (unlikely(len > sgc->length))
			len = sgc->length;

another_entry:
		/* limit to a round number less than the maximum length */
		if (len > SGE_LEN_MAX) {
			/*
			 * Save the remainder of the split.  Whenever we limit
			 * an entry we come back around to build entries out
			 * of the leftover.  We do this to prevent multiple
			 * calls to the get_phys_addr() function for an SGE
			 * that is too large.
			 */
			rem = len - SGE_LEN_MAX;
			len = SGE_LEN_MAX;
		}

		/* See if we need to allocate a new SGL */
		if (unlikely(sgc->sge.a64.curr > sgc->sge.a64.limit)) {
			u8 sgelen;
			struct esas2r_mem_desc *sgl;

			/*
			 * If no SGls are available, return failure.  The
			 * caller can call us later with the current context
			 * to pick up here.
			 */
			sgl = esas2r_alloc_sgl(a);

			if (unlikely(sgl == NULL))
				return false;

			/* Calculate the length of the last SGE filled in */
			sgelen = (u8)((u8 *)sgc->sge.a64.curr
				      - (u8 *)sgc->sge.a64.last);

			/*
			 * Copy the last SGE filled in to the first entry of
			 * the new SGL to make room for the chain entry.
			 */
			memcpy(sgl->virt_addr, sgc->sge.a64.last, sgelen);

			/* Figure out the new curr pointer in the new segment */
			sgc->sge.a64.curr =
				(struct atto_vda_sge *)((u8 *)sgl->virt_addr +
							sgelen);

			/* Set the limit pointer and build the chain entry */
			sgc->sge.a64.limit =
				(struct atto_vda_sge *)((u8 *)sgl->virt_addr
							+ sgl_page_size
							- sizeof(struct
								 atto_vda_sge));
			sgc->sge.a64.last->length = cpu_to_le32(
				SGE_CHAIN | SGE_ADDR_64);
			sgc->sge.a64.last->address =
				cpu_to_le64(sgl->phys_addr);

			/*
			 * Now, if there was a previous chain entry, then
			 * update it to contain the length of this segment
			 * and size of this chain.  otherwise this is the
			 * first SGL, so set the chain_offset in the request.
			 */
			if (sgc->sge.a64.chain) {
				sgc->sge.a64.chain->length |=
					cpu_to_le32(
						((u8 *)(sgc->sge.a64.
							last + 1)
						 - (u8 *)rq->sg_table->
						 virt_addr)
						+ sizeof(struct atto_vda_sge) *
						LOBIT(SGE_CHAIN_SZ));
			} else {
				vrq->scsi.chain_offset = (u8)
							 ((u8 *)sgc->
							  sge.a64.last -
							  (u8 *)vrq);

				/*
				 * This is the first SGL, so set the
				 * chain_offset and the VDA request size in
				 * the request.
				 */
				rq->vda_req_sz =
					(vrq->scsi.chain_offset +
					 sizeof(struct atto_vda_sge) +
					 3)
					/ sizeof(u32);
			}

			/*
			 * Remember this so when we get a new SGL filled in we
			 * can update the length of this chain entry.
			 */
			sgc->sge.a64.chain = sgc->sge.a64.last;

			/* Now link the new SGL onto the primary request. */
			list_add(&sgl->next_desc, &rq->sg_table_head);
		}

		/* Update last one filled in */
		sgc->sge.a64.last = sgc->sge.a64.curr;

		/* Build the new SGE and update the S/G context */
		sgc->sge.a64.curr->length = cpu_to_le32(SGE_ADDR_64 | len);
		sgc->sge.a64.curr->address = cpu_to_le32(addr);
		sgc->sge.a64.curr++;
		sgc->cur_offset += len;
		sgc->length -= len;

		/*
		 * Check if we previously split an entry.  If so we have to
		 * pick up where we left off.
		 */
		if (rem) {
			addr += len;
			len = rem;
			rem = 0;
			goto another_entry;
		}
	}

	/* Mark the end of the SGL */
	sgc->sge.a64.last->length |= cpu_to_le32(SGE_LAST);

	/*
	 * If there was a previous chain entry, update the length to indicate
	 * the length of this last segment.
	 */
	if (sgc->sge.a64.chain) {
		sgc->sge.a64.chain->length |= cpu_to_le32(
			((u8 *)(sgc->sge.a64.curr) -
			 (u8 *)rq->sg_table->virt_addr));
	} else {
		u16 reqsize;

		/*
		 * The entire VDA request was not used so lets
		 * set the size of the VDA request to be DMA'd
		 */
		reqsize =
			((u16)((u8 *)sgc->sge.a64.last - (u8 *)vrq)
			 + sizeof(struct atto_vda_sge) + 3) / sizeof(u32);

		/*
		 * Only update the request size if it is bigger than what is
		 * already there.  We can come in here twice for some management
		 * commands.
		 */
		if (reqsize > rq->vda_req_sz)
			rq->vda_req_sz = reqsize;
	}
	return true;
}


/*
 * Create PRD list for each I-block consumed by the command. This routine
 * determines how much data is required from each I-block being consumed
 * by the command. The first and last I-blocks can be partials and all of
 * the I-blocks in between are for a full I-block of data.
 *
 * The interleave size is used to determine the number of bytes in the 1st
 * I-block and the remaining I-blocks are what remeains.
 */
static bool esas2r_build_prd_iblk(struct esas2r_adapter *a,
				  struct esas2r_sg_context *sgc)
{
	struct esas2r_request *rq = sgc->first_req;
	u64 addr;
	u32 len;
	struct esas2r_mem_desc *sgl;
	u32 numchain = 1;
	u32 rem = 0;

	while (sgc->length) {
		/* Get the next address/length pair */

		len = (*sgc->get_phys_addr)(sgc, &addr);

		if (unlikely(len == 0))
			return false;

		/* If current length is more than what's left, stop there */

		if (unlikely(len > sgc->length))
			len = sgc->length;

another_entry:
		/* Limit to a round number less than the maximum length */

		if (len > PRD_LEN_MAX) {
			/*
			 * Save the remainder of the split.  whenever we limit
			 * an entry we come back around to build entries out
			 * of the leftover.  We do this to prevent multiple
			 * calls to the get_phys_addr() function for an SGE
			 * that is too large.
			 */
			rem = len - PRD_LEN_MAX;
			len = PRD_LEN_MAX;
		}

		/* See if we need to allocate a new SGL */
		if (sgc->sge.prd.sge_cnt == 0) {
			if (len == sgc->length) {
				/*
				 * We only have 1 PRD entry left.
				 * It can be placed where the chain
				 * entry would have gone
				 */

				/* Build the simple SGE */
				sgc->sge.prd.curr->ctl_len = cpu_to_le32(
					PRD_DATA | len);
				sgc->sge.prd.curr->address = cpu_to_le64(addr);

				/* Adjust length related fields */
				sgc->cur_offset += len;
				sgc->length -= len;

				/* We use the reserved chain entry for data */
				numchain = 0;

				break;
			}

			if (sgc->sge.prd.chain) {
				/*
				 * Fill # of entries of current SGL in previous
				 * chain the length of this current SGL may not
				 * full.
				 */

				sgc->sge.prd.chain->ctl_len |= cpu_to_le32(
					sgc->sge.prd.sgl_max_cnt);
			}

			/*
			 * If no SGls are available, return failure.  The
			 * caller can call us later with the current context
			 * to pick up here.
			 */

			sgl = esas2r_alloc_sgl(a);

			if (unlikely(sgl == NULL))
				return false;

			/*
			 * Link the new SGL onto the chain
			 * They are in reverse order
			 */
			list_add(&sgl->next_desc, &rq->sg_table_head);

			/*
			 * An SGL was just filled in and we are starting
			 * a new SGL. Prime the chain of the ending SGL with
			 * info that points to the new SGL. The length gets
			 * filled in when the new SGL is filled or ended
			 */

			sgc->sge.prd.chain = sgc->sge.prd.curr;

			sgc->sge.prd.chain->ctl_len = cpu_to_le32(PRD_CHAIN);
			sgc->sge.prd.chain->address =
				cpu_to_le64(sgl->phys_addr);

			/*
			 * Start a new segment.
			 * Take one away and save for chain SGE
			 */

			sgc->sge.prd.curr =
				(struct atto_physical_region_description *)sgl
				->
				virt_addr;
			sgc->sge.prd.sge_cnt = sgc->sge.prd.sgl_max_cnt - 1;
		}

		sgc->sge.prd.sge_cnt--;
		/* Build the simple SGE */
		sgc->sge.prd.curr->ctl_len = cpu_to_le32(PRD_DATA | len);
		sgc->sge.prd.curr->address = cpu_to_le64(addr);

		/* Used another element.  Point to the next one */

		sgc->sge.prd.curr++;

		/* Adjust length related fields */

		sgc->cur_offset += len;
		sgc->length -= len;

		/*
		 * Check if we previously split an entry.  If so we have to
		 * pick up where we left off.
		 */

		if (rem) {
			addr += len;
			len = rem;
			rem = 0;
			goto another_entry;
		}
	}

	if (!list_empty(&rq->sg_table_head)) {
		if (sgc->sge.prd.chain) {
			sgc->sge.prd.chain->ctl_len |=
				cpu_to_le32(sgc->sge.prd.sgl_max_cnt
					    - sgc->sge.prd.sge_cnt
					    - numchain);
		}
	}

	return true;
}

bool esas2r_build_sg_list_prd(struct esas2r_adapter *a,
			      struct esas2r_sg_context *sgc)
{
	struct esas2r_request *rq = sgc->first_req;
	u32 len = sgc->length;
	struct esas2r_target *t = a->targetdb + rq->target_id;
	u8 is_i_o = 0;
	u16 reqsize;
	struct atto_physical_region_description *curr_iblk_chn;
	u8 *cdb = (u8 *)&rq->vrq->scsi.cdb[0];

	/*
	 * extract LBA from command so we can determine
	 * the I-Block boundary
	 */

	if (rq->vrq->scsi.function == VDA_FUNC_SCSI
	    && t->target_state == TS_PRESENT
	    && !(t->flags & TF_PASS_THRU)) {
		u32 lbalo = 0;

		switch (rq->vrq->scsi.cdb[0]) {
		case    READ_16:
		case    WRITE_16:
		{
			lbalo =
				MAKEDWORD(MAKEWORD(cdb[9],
						   cdb[8]),
					  MAKEWORD(cdb[7],
						   cdb[6]));
			is_i_o = 1;
			break;
		}

		case    READ_12:
		case    WRITE_12:
		case    READ_10:
		case    WRITE_10:
		{
			lbalo =
				MAKEDWORD(MAKEWORD(cdb[5],
						   cdb[4]),
					  MAKEWORD(cdb[3],
						   cdb[2]));
			is_i_o = 1;
			break;
		}

		case    READ_6:
		case    WRITE_6:
		{
			lbalo =
				MAKEDWORD(MAKEWORD(cdb[3],
						   cdb[2]),
					  MAKEWORD(cdb[1] & 0x1F,
						   0));
			is_i_o = 1;
			break;
		}

		default:
			break;
		}

		if (is_i_o) {
			u32 startlba;

			rq->vrq->scsi.iblk_cnt_prd = 0;

			/* Determine size of 1st I-block PRD list       */
			startlba = t->inter_block - (lbalo & (t->inter_block -
							      1));
			sgc->length = startlba * t->block_size;

			/* Chk if the 1st iblk chain starts at base of Iblock */
			if ((lbalo & (t->inter_block - 1)) == 0)
				rq->flags |= RF_1ST_IBLK_BASE;

			if (sgc->length > len)
				sgc->length = len;
		} else {
			sgc->length = len;
		}
	} else {
		sgc->length = len;
	}

	/* get our starting chain address   */

	curr_iblk_chn =
		(struct atto_physical_region_description *)sgc->sge.a64.curr;

	sgc->sge.prd.sgl_max_cnt = sgl_page_size /
				   sizeof(struct
					  atto_physical_region_description);

	/* create all of the I-block PRD lists          */

	while (len) {
		sgc->sge.prd.sge_cnt = 0;
		sgc->sge.prd.chain = NULL;
		sgc->sge.prd.curr = curr_iblk_chn;

		/* increment to next I-Block    */

		len -= sgc->length;

		/* go build the next I-Block PRD list   */

		if (unlikely(!esas2r_build_prd_iblk(a, sgc)))
			return false;

		curr_iblk_chn++;

		if (is_i_o) {
			rq->vrq->scsi.iblk_cnt_prd++;

			if (len > t->inter_byte)
				sgc->length = t->inter_byte;
			else
				sgc->length = len;
		}
	}

	/* figure out the size used of the VDA request */

	reqsize = ((u16)((u8 *)curr_iblk_chn - (u8 *)rq->vrq))
		  / sizeof(u32);

	/*
	 * only update the request size if it is bigger than what is
	 * already there.  we can come in here twice for some management
	 * commands.
	 */

	if (reqsize > rq->vda_req_sz)
		rq->vda_req_sz = reqsize;

	return true;
}

static void esas2r_handle_pending_reset(struct esas2r_adapter *a, u32 currtime)
{
	u32 delta = currtime - a->chip_init_time;

	if (delta <= ESAS2R_CHPRST_WAIT_TIME) {
		/* Wait before accessing registers */
	} else if (delta >= ESAS2R_CHPRST_TIME) {
		/*
		 * The last reset failed so try again. Reset
		 * processing will give up after three tries.
		 */
		esas2r_local_reset_adapter(a);
	} else {
		/* We can now see if the firmware is ready */
		u32 doorbell;

		doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
		if (doorbell == 0xFFFFFFFF || !(doorbell & DRBL_FORCE_INT)) {
			esas2r_force_interrupt(a);
		} else {
			u32 ver = (doorbell & DRBL_FW_VER_MSK);

			/* Driver supports API version 0 and 1 */
			esas2r_write_register_dword(a, MU_DOORBELL_OUT,
						    doorbell);
			if (ver == DRBL_FW_VER_0) {
				set_bit(AF_CHPRST_DETECTED, &a->flags);
				set_bit(AF_LEGACY_SGE_MODE, &a->flags);

				a->max_vdareq_size = 128;
				a->build_sgl = esas2r_build_sg_list_sge;
			} else if (ver == DRBL_FW_VER_1) {
				set_bit(AF_CHPRST_DETECTED, &a->flags);
				clear_bit(AF_LEGACY_SGE_MODE, &a->flags);

				a->max_vdareq_size = 1024;
				a->build_sgl = esas2r_build_sg_list_prd;
			} else {
				esas2r_local_reset_adapter(a);
			}
		}
	}
}


/* This function must be called once per timer tick */
void esas2r_timer_tick(struct esas2r_adapter *a)
{
	u32 currtime = jiffies_to_msecs(jiffies);
	u32 deltatime = currtime - a->last_tick_time;

	a->last_tick_time = currtime;

	/* count down the uptime */
	if (a->chip_uptime &&
	    !test_bit(AF_CHPRST_PENDING, &a->flags) &&
	    !test_bit(AF_DISC_PENDING, &a->flags)) {
		if (deltatime >= a->chip_uptime)
			a->chip_uptime = 0;
		else
			a->chip_uptime -= deltatime;
	}

	if (test_bit(AF_CHPRST_PENDING, &a->flags)) {
		if (!test_bit(AF_CHPRST_NEEDED, &a->flags) &&
		    !test_bit(AF_CHPRST_DETECTED, &a->flags))
			esas2r_handle_pending_reset(a, currtime);
	} else {
		if (test_bit(AF_DISC_PENDING, &a->flags))
			esas2r_disc_check_complete(a);
		if (test_bit(AF_HEARTBEAT_ENB, &a->flags)) {
			if (test_bit(AF_HEARTBEAT, &a->flags)) {
				if ((currtime - a->heartbeat_time) >=
				    ESAS2R_HEARTBEAT_TIME) {
					clear_bit(AF_HEARTBEAT, &a->flags);
					esas2r_hdebug("heartbeat failed");
					esas2r_log(ESAS2R_LOG_CRIT,
						   "heartbeat failed");
					esas2r_bugon();
					esas2r_local_reset_adapter(a);
				}
			} else {
				set_bit(AF_HEARTBEAT, &a->flags);
				a->heartbeat_time = currtime;
				esas2r_force_interrupt(a);
			}
		}
	}

	if (atomic_read(&a->disable_cnt) == 0)
		esas2r_do_deferred_processes(a);
}

/*
 * Send the specified task management function to the target and LUN
 * specified in rqaux.  in addition, immediately abort any commands that
 * are queued but not sent to the device according to the rules specified
 * by the task management function.
 */
bool esas2r_send_task_mgmt(struct esas2r_adapter *a,
			   struct esas2r_request *rqaux, u8 task_mgt_func)
{
	u16 targetid = rqaux->target_id;
	u8 lun = (u8)le32_to_cpu(rqaux->vrq->scsi.flags);
	bool ret = false;
	struct esas2r_request *rq;
	struct list_head *next, *element;
	unsigned long flags;

	LIST_HEAD(comp_list);

	esas2r_trace_enter();
	esas2r_trace("rqaux:%p", rqaux);
	esas2r_trace("task_mgt_func:%x", task_mgt_func);
	spin_lock_irqsave(&a->queue_lock, flags);

	/* search the defer queue looking for requests for the device */
	list_for_each_safe(element, next, &a->defer_list) {
		rq = list_entry(element, struct esas2r_request, req_list);

		if (rq->vrq->scsi.function == VDA_FUNC_SCSI
		    && rq->target_id == targetid
		    && (((u8)le32_to_cpu(rq->vrq->scsi.flags)) == lun
			|| task_mgt_func == 0x20)) { /* target reset */
			/* Found a request affected by the task management */
			if (rq->req_stat == RS_PENDING) {
				/*
				 * The request is pending or waiting.  We can
				 * safelycomplete the request now.
				 */
				if (esas2r_ioreq_aborted(a, rq, RS_ABORTED))
					list_add_tail(&rq->comp_list,
						      &comp_list);
			}
		}
	}

	/* Send the task management request to the firmware */
	rqaux->sense_len = 0;
	rqaux->vrq->scsi.length = 0;
	rqaux->target_id = targetid;
	rqaux->vrq->scsi.flags |= cpu_to_le32(lun);
	memset(rqaux->vrq->scsi.cdb, 0, sizeof(rqaux->vrq->scsi.cdb));
	rqaux->vrq->scsi.flags |=
		cpu_to_le16(task_mgt_func * LOBIT(FCP_CMND_TM_MASK));

	if (test_bit(AF_FLASHING, &a->flags)) {
		/* Assume success.  if there are active requests, return busy */
		rqaux->req_stat = RS_SUCCESS;

		list_for_each_safe(element, next, &a->active_list) {
			rq = list_entry(element, struct esas2r_request,
					req_list);
			if (rq->vrq->scsi.function == VDA_FUNC_SCSI
			    && rq->target_id == targetid
			    && (((u8)le32_to_cpu(rq->vrq->scsi.flags)) == lun
				|| task_mgt_func == 0x20))  /* target reset */
				rqaux->req_stat = RS_BUSY;
		}

		ret = true;
	}

	spin_unlock_irqrestore(&a->queue_lock, flags);

	if (!test_bit(AF_FLASHING, &a->flags))
		esas2r_start_request(a, rqaux);

	esas2r_comp_list_drain(a, &comp_list);

	if (atomic_read(&a->disable_cnt) == 0)
		esas2r_do_deferred_processes(a);

	esas2r_trace_exit();

	return ret;
}

void esas2r_reset_bus(struct esas2r_adapter *a)
{
	esas2r_log(ESAS2R_LOG_INFO, "performing a bus reset");

	if (!test_bit(AF_DEGRADED_MODE, &a->flags) &&
	    !test_bit(AF_CHPRST_PENDING, &a->flags) &&
	    !test_bit(AF_DISC_PENDING, &a->flags)) {
		set_bit(AF_BUSRST_NEEDED, &a->flags);
		set_bit(AF_BUSRST_PENDING, &a->flags);
		set_bit(AF_OS_RESET, &a->flags);

		esas2r_schedule_tasklet(a);
	}
}

bool esas2r_ioreq_aborted(struct esas2r_adapter *a, struct esas2r_request *rq,
			  u8 status)
{
	esas2r_trace_enter();
	esas2r_trace("rq:%p", rq);
	list_del_init(&rq->req_list);
	if (rq->timeout > RQ_MAX_TIMEOUT) {
		/*
		 * The request timed out, but we could not abort it because a
		 * chip reset occurred.  Return busy status.
		 */
		rq->req_stat = RS_BUSY;
		esas2r_trace_exit();
		return true;
	}

	rq->req_stat = status;
	esas2r_trace_exit();
	return true;
}
OpenPOWER on IntegriCloud