summaryrefslogtreecommitdiffstats
path: root/sys/scsi/sd.c
blob: 1ae8533701bcb5679d3f8f4f65743ab7de0db041 (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
/*
 * Written by Julian Elischer (julian@dialix.oz.au)
 * for TRW Financial Systems for use under the MACH(2.5) operating system.
 *
 * TRW Financial Systems, in accordance with their agreement with Carnegie
 * Mellon University, makes this software available to CMU to distribute
 * or use in any manner that they see fit as long as this message is kept with
 * the software. For this reason TFS also grants any other persons or
 * organisations permission to use or modify this software.
 *
 * TFS supplies this software to be publicly redistributed
 * on the understanding that TFS is not responsible for the correct
 * functioning of this software in any circumstances.
 *
 * Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
 *
 *      $Id: sd.c,v 1.64 1995/05/08 16:53:33 bde Exp $
 */

#define SPLSD splbio
#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/dkbad.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/dkstat.h>
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>
#include <vm/vm.h>
#include <sys/devconf.h>
#include <sys/dkstat.h>
#include <machine/md_var.h>
#include <i386/i386/cons.h>		/* XXX */

u_int32 sdstrats, sdqueues;

#define SECSIZE 512
#define	SDOUTSTANDING	4
#define	SD_RETRIES	4
#define	MAXTRANSFER	8		/* 1 page at a time */

#define	PARTITION(dev)	dkpart(dev)
#define	SDUNIT(dev)	dkunit(dev)

/* XXX introduce a dkmodunit() macro for this. */
#define SDSETUNIT(DEV, U) \
 makedev(major(DEV), dkmakeminor((U), dkslice(DEV), dkpart(DEV)))

errval	sd_get_parms __P((int unit, int flags));
static	void	sdstrategy1 __P((struct buf *));

int		sd_sense_handler __P((struct scsi_xfer *));
void    sdstart __P((u_int32, u_int32));

struct scsi_data {
	u_int32 flags;
#define	SDINIT		0x04	/* device has been init'd */
	struct disk_parms {
		u_char  heads;	/* Number of heads */
		u_int16 cyls;	/* Number of cylinders */
		u_char  sectors;	/*dubious *//* Number of sectors/track */
		u_int16 secsiz;	/* Number of bytes/sector */
		u_int32 disksize;	/* total number sectors */
	} params;
	struct diskslices *dk_slices;	/* virtual drives */
	struct buf buf_queue;
	int dkunit;		/* disk stats unit number */
};

static int sdunit(dev_t dev) { return SDUNIT(dev); }
static dev_t sdsetunit(dev_t dev, int unit) { return SDSETUNIT(dev, unit); }

errval sd_open __P((dev_t dev, int mode, int fmt, struct proc *p,
		    struct scsi_link *sc_link));
errval sd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag,
		struct proc *p, struct scsi_link *sc_link);
errval sd_close __P((dev_t dev, int fflag, int fmt, struct proc *p,
		     struct scsi_link *sc_link));
void sd_strategy(struct buf *bp, struct scsi_link *sc_link);

SCSI_DEVICE_ENTRIES(sd)

struct scsi_device sd_switch =
{
    sd_sense_handler,
    sdstart,			/* have a queue, served by this */
    NULL,			/* have no async handler */
    NULL,			/* Use default 'done' routine */
    "sd",
    0,
	{0, 0},
	0,				/* Link flags */
	sdattach,
	"Direct-Access",
	sdopen,
    sizeof(struct scsi_data),
	T_DIRECT,
	sdunit,
	sdsetunit,
	sd_open,
	sd_ioctl,
	sd_close,
	sd_strategy,
};

static struct scsi_xfer sx;

static int
sd_externalize(struct proc *p, struct kern_devconf *kdc, void *userp,
	       size_t len)
{
	return scsi_externalize(SCSI_LINK(&sd_switch, kdc->kdc_unit),
				userp, &len);
}

static struct kern_devconf kdc_sd_template = {
	0, 0, 0,		/* filled in by dev_attach */
	"sd", 0, MDDC_SCSI,
	sd_externalize, 0, scsi_goaway, SCSI_EXTERNALLEN,
	&kdc_scbus0,		/* XXX parent */
	0,			/* parentdata */
	DC_UNKNOWN,		/* not supported */
};

static inline void
sd_registerdev(int unit)
{
	struct kern_devconf *kdc;

	MALLOC(kdc, struct kern_devconf *, sizeof *kdc, M_TEMP, M_NOWAIT);
	if(!kdc) return;
	*kdc = kdc_sd_template;
	kdc->kdc_unit = unit;
	kdc->kdc_description = sd_switch.desc;
	dev_attach(kdc);
	if(dk_ndrive < DK_NDRIVE) {
		sprintf(dk_names[dk_ndrive], "sd%d", unit);
		dk_wpms[dk_ndrive] = (8*1024*1024/2);
		SCSI_DATA(&sd_switch, unit)->dkunit = dk_ndrive++;
	} else {
		SCSI_DATA(&sd_switch, unit)->dkunit = -1;
	}
}


/*
 * The routine called by the low level scsi routine when it discovers
 * a device suitable for this driver.
 */
errval
sdattach(struct scsi_link *sc_link)
{
	u_int32 unit;
	struct disk_parms *dp;

	struct scsi_data *sd = sc_link->sd;

	unit = sc_link->dev_unit;

	dp = &(sd->params);

	if (sc_link->opennings > SDOUTSTANDING)
		sc_link->opennings = SDOUTSTANDING;
	/*
	 * Use the subdriver to request information regarding
	 * the drive. We cannot use interrupts yet, so the
	 * request must specify this.
	 */
	sd_get_parms(unit, SCSI_NOSLEEP | SCSI_NOMASK);
	/*
	 * if we don't have actual parameters, assume 512 bytes/sec
	 * (could happen on removable media - MOD)
	 * -- this avoids the division below from falling over
	 */
	if(dp->secsiz == 0) dp->secsiz = SECSIZE;
	printf("%ldMB (%ld %d byte sectors)",
	    dp->disksize / ((1024L * 1024L) / dp->secsiz),
	    dp->disksize,
	    dp->secsiz);

#ifndef SCSI_REPORT_GEOMETRY
	if ( (sc_link->flags & SDEV_BOOTVERBOSE) )
#endif
	{
		sc_print_addr(sc_link);
		printf("with %d cyls, %d heads, and an average %d sectors/track",
	   	dp->cyls, dp->heads, dp->sectors);
	}

	sd->flags |= SDINIT;
	sd_registerdev(unit);

	return 0;
}

/*
 * open the device. Make sure the partition info is a up-to-date as can be.
 */
errval
sd_open(dev, mode, fmt, p, sc_link)
	dev_t	dev;
	int	mode;
	int	fmt;
	struct proc *p;
	struct scsi_link *sc_link;
{
	errval  errcode = 0;
	u_int32 unit;
	struct disklabel label;
	struct scsi_data *sd;

	unit = SDUNIT(dev);
	sd = sc_link->sd;

	/*
	 * Make sure the disk has been initialised
	 * At some point in the future, get the scsi driver
	 * to look for a new device if we are not initted
	 */
	if ((!sd) || (!(sd->flags & SDINIT))) {
		return (ENXIO);
	}

	SC_DEBUG(sc_link, SDEV_DB1,
	    ("sd_open: dev=0x%lx (unit %ld, partition %d)\n",
		dev, unit, PARTITION(dev)));

	/*
	 * "unit attention" errors should occur here if the
	 * drive has been restarted or the pack changed.
	 * just ingnore the result, it's a decoy instruction
	 * The error code will act on the error though
	 * and invalidate any media information we had.
	 */
	scsi_test_unit_ready(sc_link, 0);

	/*
	 * If it's been invalidated, then forget the label
	 */
	sc_link->flags |= SDEV_OPEN;	/* unit attn becomes an err now */
	if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
		/*
		 * If somebody still has it open, then forbid re-entry.
		 */
		if (dsisopen(sd->dk_slices)) {
			errcode = ENXIO;
			goto bad;
		}

		if (sd->dk_slices == NULL)
			Debugger("sdopen: no slices");
		else
			dsgone(&sd->dk_slices);
	}
	/*
	 * In case it is a funny one, tell it to start
	 * not needed for  most hard drives (ignore failure)
	 */
	scsi_start_unit(sc_link, SCSI_ERR_OK | SCSI_SILENT);

	/*
	 * Check that it is still responding and ok.
	 */
	if (scsi_test_unit_ready(sc_link, 0)) {
		SC_DEBUG(sc_link, SDEV_DB3, ("device not reponding\n"));
		errcode = ENXIO;
		goto bad;
	}
	SC_DEBUG(sc_link, SDEV_DB3, ("device ok\n"));

	/*
	 * Load the physical device parameters
	 */
	sd_get_parms(unit, 0);	/* sets SDEV_MEDIA_LOADED */
	if (sd->params.secsiz != SECSIZE) {	/* XXX One day... */
		printf("sd%ld: Can't deal with %d bytes logical blocks\n",
		    unit, sd->params.secsiz);
		Debugger("sd");
		errcode = ENXIO;
		goto bad;
	}
	SC_DEBUG(sc_link, SDEV_DB3, ("Params loaded "));

	/* Lock the pack in. */
	scsi_prevent(sc_link, PR_PREVENT, SCSI_ERR_OK | SCSI_SILENT);

	/* Build label for whole disk. */
	bzero(&label, sizeof label);
	label.d_secsize = sd->params.secsiz;
	label.d_nsectors = sd->params.sectors;
	label.d_ntracks = sd->params.heads;
	label.d_ncylinders = sd->params.cyls;
	label.d_secpercyl = sd->params.heads * sd->params.sectors;
	if (label.d_secpercyl == 0)
		label.d_secpercyl = 100;
		/* XXX as long as it's not 0 - readdisklabel divides by it (?) */
	label.d_secperunit = sd->params.disksize;

	/* Initialize slice tables. */
	errcode = dsopen("sd", dev, fmt, &sd->dk_slices, &label, sdstrategy1,
			 (ds_setgeom_t *)NULL);
	if (errcode != 0)
		goto bad;
	SC_DEBUG(sc_link, SDEV_DB3, ("Slice tables initialized "));

	SC_DEBUG(sc_link, SDEV_DB3, ("open %ld %ld\n", sdstrats, sdqueues));

	return 0;

bad:
	if (!dsisopen(sd->dk_slices)) {
		scsi_prevent(sc_link, PR_ALLOW, SCSI_ERR_OK | SCSI_SILENT);
		sc_link->flags &= ~SDEV_OPEN;
	}
	return errcode;
}

/*
 * close the device.. only called if we are the LAST occurence of an open
 * device.  Convenient now but usually a pain.
 */
errval
sd_close(dev, fflag, fmt, p, sc_link)
	dev_t	dev;
	int	fflag;
	int	fmt;
	struct proc *p;
	struct scsi_link *sc_link;
{
	struct scsi_data *sd;

	sd = sc_link->sd;
	dsclose(dev, fmt, sd->dk_slices);
	if (!dsisopen(sd->dk_slices)) {
		scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT | SCSI_ERR_OK);
		sc_link->flags &= ~SDEV_OPEN;
	}
	return (0);
}

/*
 * Actually translate the requested transfer into one the physical driver
 * can understand.  The transfer is described by a buf and will include
 * only one physical transfer.
 */
void
sd_strategy(struct buf *bp, struct scsi_link *sc_link)
{
	struct buf *dp;
	u_int32 opri;
	struct scsi_data *sd;
	u_int32 unit;

	sdstrats++;
	unit = SDUNIT((bp->b_dev));
	sd = sc_link->sd;
	/*
	 * If the device has been made invalid, error out
	 */
	if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
		bp->b_error = EIO;
		goto bad;
	}

	/*
	 * Odd number of bytes
	 */
	if (bp->b_bcount % DEV_BSIZE != 0) {
		bp->b_error = EINVAL;
		goto bad;
	}
	/*
	 * Do bounds checking, adjust transfer, set b_cylin and b_pbklno.
	 */
	if (dscheck(bp, sd->dk_slices) <= 0)
		goto done;	/* XXX check b_resid */

	opri = SPLSD();
	dp = &sd->buf_queue;

	/*
	 * Use a bounce buffer if necessary
	 */
#ifdef BOUNCE_BUFFERS
	if (sc_link->flags & SDEV_BOUNCE)
		vm_bounce_alloc(bp);
#endif

	/*
	 * Place it in the queue of disk activities for this disk
	 */
	disksort(dp, bp);

	/*
	 * Tell the device to get going on the transfer if it's
	 * not doing anything, otherwise just wait for completion
	 */
	sdstart(unit, 0);

	splx(opri);
	return /*0*/;
bad:
	bp->b_flags |= B_ERROR;
done:

	/*
	 * Correctly set the buf to indicate a completed xfer
	 */
	bp->b_resid = bp->b_bcount;
	biodone(bp);
	return /*0*/;
}

static void
sdstrategy1(struct buf *bp)
{
	/*
	 * XXX - do something to make sdstrategy() but not this block while
	 * we're doing dsinit() and dsioctl().
	 */
	sdstrategy(bp);
}

/*
 * sdstart looks to see if there is a buf waiting for the device
 * and that the device is not already busy. If both are true,
 * It dequeues the buf and creates a scsi command to perform the
 * transfer in the buf. The transfer request will call scsi_done
 * on completion, which will in turn call this routine again
 * so that the next queued transfer is performed.
 * The bufs are queued by the strategy routine (sdstrategy)
 *
 * This routine is also called after other non-queued requests
 * have been made of the scsi driver, to ensure that the queue
 * continues to be drained.
 *
 * must be called at the correct (highish) spl level
 * sdstart() is called at SPLSD  from sdstrategy and scsi_done
 */
void
sdstart(u_int32 unit, u_int32 flags)
{
	register struct	scsi_link *sc_link = SCSI_LINK(&sd_switch, unit);
	register struct scsi_data *sd = sc_link->sd;
	struct buf *bp = 0;
	struct buf *dp;
	struct scsi_rw_big cmd;
	u_int32 blkno, nblk;

	SC_DEBUG(sc_link, SDEV_DB2, ("sdstart "));
	/*
	 * Check if the device has room for another command
	 */
	while (sc_link->opennings) {

		/*
		 * there is excess capacity, but a special waits
		 * It'll need the adapter as soon as we clear out of the
		 * way and let it run (user level wait).
		 */
		if (sc_link->flags & SDEV_WAITING) {
			return;
		}
		/*
		 * See if there is a buf with work for us to do..
		 */
		dp = &sd->buf_queue;
		if ((bp = dp->b_actf) == NULL) {	/* yes, an assign */
			return;
		}
		dp->b_actf = bp->b_actf;

		/*
		 *  If the device has become invalid, abort all the
		 * reads and writes until all files have been closed and
		 * re-openned
		 */
		if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
			goto bad;
		}
		/*
		 * We have a buf, now we know we are going to go through
		 * With this thing..
		 */
		blkno = bp->b_pblkno;
		if (bp->b_bcount & (SECSIZE - 1))
		{
		    goto bad;
		}
		nblk = bp->b_bcount >> 9;

		/*
		 *  Fill out the scsi command
		 */
		bzero(&cmd, sizeof(cmd));
		cmd.op_code = (bp->b_flags & B_READ)
		    ? READ_BIG : WRITE_BIG;
		cmd.addr_3 = (blkno & 0xff000000UL) >> 24;
		cmd.addr_2 = (blkno & 0xff0000) >> 16;
		cmd.addr_1 = (blkno & 0xff00) >> 8;
		cmd.addr_0 = blkno & 0xff;
		cmd.length2 = (nblk & 0xff00) >> 8;
		cmd.length1 = (nblk & 0xff);
		/*
		 * Call the routine that chats with the adapter.
		 * Note: we cannot sleep as we may be an interrupt
		 */
		if (scsi_scsi_cmd(sc_link,
			(struct scsi_generic *) &cmd,
			sizeof(cmd),
			(u_char *) bp->b_un.b_addr,
			bp->b_bcount,
			SD_RETRIES,
			10000,
			bp,
			flags | ((bp->b_flags & B_READ) ?
			    SCSI_DATA_IN : SCSI_DATA_OUT))
		    == SUCCESSFULLY_QUEUED) {
			sdqueues++;
			if(sd->dkunit >= 0) {
				dk_xfer[sd->dkunit]++;
				dk_seek[sd->dkunit]++; /* don't know */
				dk_wds[sd->dkunit] += bp->b_bcount >> 6;
			}
		} else {
bad:
			printf("sd%ld: oops not queued\n", unit);
			bp->b_error = EIO;
			bp->b_flags |= B_ERROR;
			biodone(bp);
		}
	}
}

/*
 * Perform special action on behalf of the user
 * Knows about the internals of this device
 */
errval
sd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
	 struct scsi_link *sc_link)
{
	/* struct sd_cmd_buf *args; */
	errval  error;
	struct scsi_data *sd;

	/*
	 * Find the device that the user is talking about
	 */
	sd = sc_link->sd;
	SC_DEBUG(sc_link, SDEV_DB1, ("sdioctl (0x%x)", cmd));

#if 0
	/* Wait until we have exclusive access to the device. */
	/* XXX this is how wd does it.  How did we work without this? */
	wdsleep(du->dk_ctrlr, "wdioct");
#endif

	/*
	 * If the device is not valid.. abandon ship
	 */
	if (!(sc_link->flags & SDEV_MEDIA_LOADED))
		return (EIO);

	if (cmd ==  DIOCSBAD)
		return (EINVAL);	/* XXX */
	error = dsioctl("sd", dev, cmd, addr, flag, &sd->dk_slices,
			sdstrategy1, (ds_setgeom_t *)NULL);
	if (error != -1)
		return (error);
	if (PARTITION(dev) != RAW_PART)
		return (ENOTTY);
	return (scsi_do_ioctl(dev, cmd, addr, flag, p, sc_link));
}

/*
 * Find out from the device what it's capacity is
 */
u_int32
sd_size(unit, flags)
	int	unit, flags;
{
	struct scsi_read_cap_data rdcap;
	struct scsi_read_capacity scsi_cmd;
	u_int32 size;
	struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit);

	/*
	 * make up a scsi command and ask the scsi driver to do
	 * it for you.
	 */
	bzero(&scsi_cmd, sizeof(scsi_cmd));
	scsi_cmd.op_code = READ_CAPACITY;

	/*
	 * If the command works, interpret the result as a 4 byte
	 * number of blocks
	 */
	if (scsi_scsi_cmd(sc_link,
		(struct scsi_generic *) &scsi_cmd,
		sizeof(scsi_cmd),
		(u_char *) & rdcap,
		sizeof(rdcap),
		SD_RETRIES,
		2000,
		NULL,
		flags | SCSI_DATA_IN) != 0) {
		printf("sd%d: could not get size\n", unit);
		return (0);
	} else {
		size = rdcap.addr_0 + 1;
		size += rdcap.addr_1 << 8;
		size += rdcap.addr_2 << 16;
		size += rdcap.addr_3 << 24;
	}
	return (size);
}

/*
 * Tell the device to map out a defective block
 */
errval
sd_reassign_blocks(unit, block)
	int	unit, block;
{
	struct scsi_reassign_blocks scsi_cmd;
	struct scsi_reassign_blocks_data rbdata;
	struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit);

	bzero(&scsi_cmd, sizeof(scsi_cmd));
	bzero(&rbdata, sizeof(rbdata));
	scsi_cmd.op_code = REASSIGN_BLOCKS;

	rbdata.length_msb = 0;
	rbdata.length_lsb = sizeof(rbdata.defect_descriptor[0]);
	rbdata.defect_descriptor[0].dlbaddr_3 = ((block >> 24) & 0xff);
	rbdata.defect_descriptor[0].dlbaddr_2 = ((block >> 16) & 0xff);
	rbdata.defect_descriptor[0].dlbaddr_1 = ((block >> 8) & 0xff);
	rbdata.defect_descriptor[0].dlbaddr_0 = ((block) & 0xff);

	return (scsi_scsi_cmd(sc_link,
		(struct scsi_generic *) &scsi_cmd,
		sizeof(scsi_cmd),
		(u_char *) & rbdata,
		sizeof(rbdata),
		SD_RETRIES,
		5000,
		NULL,
		SCSI_DATA_OUT));
}
#define b2tol(a)	(((unsigned)(a##_1) << 8) + (unsigned)a##_0 )

/*
 * Get the scsi driver to send a full inquiry to the
 * device and use the results to fill out the disk
 * parameter structure.
 */
errval
sd_get_parms(unit, flags)
	int	unit, flags;
{
	struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit);
	struct scsi_data *sd = sc_link->sd;
	struct disk_parms *disk_parms = &sd->params;
	struct scsi_mode_sense scsi_cmd;
	struct scsi_mode_sense_data {
		struct scsi_mode_header header;
		struct blk_desc blk_desc;
		union disk_pages pages;
	} scsi_sense;
	u_int32 sectors;

	/*
	 * First check if we have it all loaded
	 */
	if (sc_link->flags & SDEV_MEDIA_LOADED)
		return 0;

	/*
	 * do a "mode sense page 4"
	 */
	bzero(&scsi_cmd, sizeof(scsi_cmd));
	scsi_cmd.op_code = MODE_SENSE;
	scsi_cmd.page = 4;
	scsi_cmd.length = 0x20;
	/*
	 * If the command worked, use the results to fill out
	 * the parameter structure
	 */
	if (scsi_scsi_cmd(sc_link,
		(struct scsi_generic *) &scsi_cmd,
		sizeof(scsi_cmd),
		(u_char *) & scsi_sense,
		sizeof(scsi_sense),
		SD_RETRIES,
		4000,
		NULL,
		flags | SCSI_DATA_IN) != 0) {

		printf("sd%d could not mode sense (4).", unit);
		printf(" Using ficticious geometry\n");
		/*
		 * use adaptec standard ficticious geometry
		 * this depends on which controller (e.g. 1542C is
		 * different. but we have to put SOMETHING here..)
		 */
		sectors = sd_size(unit, flags);
		disk_parms->heads = 64;
		disk_parms->sectors = 32;
		disk_parms->cyls = sectors / (64 * 32);
		disk_parms->secsiz = SECSIZE;
		disk_parms->disksize = sectors;
	} else {

		SC_DEBUG(sc_link, SDEV_DB3,
		    ("%ld cyls, %d heads, %d precomp, %d red_write, %d land_zone\n",
			scsi_3btou(&scsi_sense.pages.rigid_geometry.ncyl_2),
			scsi_sense.pages.rigid_geometry.nheads,
			b2tol(scsi_sense.pages.rigid_geometry.st_cyl_wp),
			b2tol(scsi_sense.pages.rigid_geometry.st_cyl_rwc),
			b2tol(scsi_sense.pages.rigid_geometry.land_zone)));

		/*
		 * KLUDGE!!(for zone recorded disks)
		 * give a number of sectors so that sec * trks * cyls
		 * is <= disk_size
		 * can lead to wasted space! THINK ABOUT THIS !
		 */
		disk_parms->heads = scsi_sense.pages.rigid_geometry.nheads;
		disk_parms->cyls = scsi_3btou(&scsi_sense.pages.rigid_geometry.ncyl_2);
		disk_parms->secsiz = scsi_3btou(scsi_sense.blk_desc.blklen);

		sectors = sd_size(unit, flags);
		disk_parms->disksize = sectors;
		/* Check if none of these values are zero */
		if(disk_parms->heads && disk_parms->cyls) {
			sectors /= (disk_parms->heads * disk_parms->cyls);
		}
		else {
			/* set it to something reasonable */
			disk_parms->heads = 64;
			disk_parms->cyls = sectors / (64 * 32);
			sectors = 32;
		}
		/* keep secsiz sane too - we may divide by it later */
		if(disk_parms->secsiz == 0)
			disk_parms->secsiz = SECSIZE;
		disk_parms->sectors = sectors;	/* dubious on SCSI *//*XXX */
	}
	sc_link->flags |= SDEV_MEDIA_LOADED;
	return 0;
}

int
sdsize(dev_t dev)
{
	struct scsi_data *sd;

	sd = SCSI_DATA(&sd_switch, (u_int32) SDUNIT(dev));
	if (sd == NULL)
		return (-1);
	return (dssize(dev, &sd->dk_slices, sdopen, sdclose));
}

/*
 * sense handler: Called to determine what to do when the
 * device returns a CHECK CONDITION.
 *
 * This will issue a retry when the device returns a
 * non-media hardware failure.  The CDC-WREN IV does this
 * when you access it during thermal calibrarion, so the drive
 * is pretty useless without this.
 *
 * In general, you probably almost always would like to issue a retry
 * for your disk I/O.  It can't hurt too much (the caller only retries
 * so many times) and it may save your butt.
 */

int sd_sense_handler(struct scsi_xfer *xs)
{
	struct scsi_sense_data *sense;
	struct scsi_inquiry_data *inqbuf;

	sense = &(xs->sense);

	/* I don't know what the heck to do with a deferred error,
	 * so I'll just kick it back to the caller.
	 */
	if ((sense->error_code & SSD_ERRCODE) == 0x71)
		return SCSIRET_CONTINUE;

	if (((sense->error_code & SSD_ERRCODE) == 0x70) &&
		((sense->ext.extended.flags & SSD_KEY) == 0x05))
		/* No point in retrying Illegal Requests */
			return SCSIRET_CONTINUE;

	inqbuf = &(xs->sc_link->inqbuf);

	/* It is dangerous to retry on removable drives without
	 * looking carefully at the additional sense code
	 * and sense code qualifier and ensuring the disk hasn't changed:
	 */
	if (inqbuf->dev_qual2 & SID_REMOVABLE)
		return SCSIRET_CONTINUE;

	/* Retry all disk errors.
	 */
	scsi_sense_print(xs);
	if (xs->retries)
		printf(", retries:%d\n", xs->retries);
	else
		printf(", FAILURE\n");

	return SCSIRET_DO_RETRY;
}

/*
 * dump all of physical memory into the partition specified, starting
 * at offset 'dumplo' into the partition.
 */
errval
sddump(dev_t dev)
{				/* dump core after a system crash */
	struct disklabel *lp;
	register struct scsi_data *sd;	/* disk unit to do the IO */
	struct scsi_link *sc_link;
	int32	num;		/* number of sectors to write */
	u_int32	unit, part;
	int32	blkoff, blknum, blkcnt = MAXTRANSFER;
	int32	nblocks;
	char	*addr;
	struct	scsi_rw_big cmd;
	static	int sddoingadump = 0;
	struct	scsi_xfer *xs = &sx;
	errval	retval;

	addr = (char *) 0;	/* starting address */

	/* toss any characters present prior to dump */
	while (cncheckc())
		;

	/* size of memory to dump */
	num = Maxmem;
	unit = SDUNIT(dev);	/* eventually support floppies? */
	part = PARTITION(dev);	/* file system */

	sc_link = SCSI_LINK(&sd_switch, unit);

	if (!sc_link)
		return ENXIO;

	sd = sc_link->sd;

	/* was it ever initialized etc. ? */
	if (!(sd->flags & SDINIT))
		return (ENXIO);
	if ((sc_link->flags & SDEV_MEDIA_LOADED) != SDEV_MEDIA_LOADED)
		return (ENXIO);
	if (sd->dk_slices == NULL)
		Debugger("sddump: no slices");
	if ((lp = dsgetlabel(dev, sd->dk_slices)) == NULL)
		return (ENXIO);

	/* Convert to disk sectors */
	num = (u_int32) num * NBPG / sd->params.secsiz;	/* XXX it must be 512 */

	/* check if controller active */
	if (sddoingadump)
		return (EFAULT);

	nblocks = lp->d_partitions[part].p_size;
	blkoff = lp->d_partitions[part].p_offset;
	/* XXX */
	blkoff += sd->dk_slices->dss_slices[dkslice(dev)].ds_offset;

	/* check transfer bounds against partition size */
	if ((dumplo < 0) || ((dumplo + num) > nblocks))
		return (EINVAL);

	sddoingadump = 1;

	blknum = dumplo + blkoff;
	while (num > 0) {
                *(int *)CMAP1 =		/* XXX use pmap_enter() */
			PG_V | PG_KW | trunc_page(addr);
                pmap_update();
		/*
		 *  Fill out the scsi command
		 */
		bzero(&cmd, sizeof(cmd));
		cmd.op_code = WRITE_BIG;
		cmd.addr_3 = (blknum & 0xff000000) >> 24;
		cmd.addr_2 = (blknum & 0xff0000) >> 16;
		cmd.addr_1 = (blknum & 0xff00) >> 8;
		cmd.addr_0 = blknum & 0xff;
		cmd.length2 = (blkcnt & 0xff00) >> 8;
		cmd.length1 = (blkcnt & 0xff);
		/*
		 * Fill out the scsi_xfer structure
		 *    Note: we cannot sleep as we may be an interrupt
		 * don't use scsi_scsi_cmd() as it may want
		 * to wait for an xs.
		 */
		bzero(xs, sizeof(sx));
		xs->flags |= SCSI_NOMASK | SCSI_NOSLEEP | INUSE | SCSI_DATA_OUT;
		xs->sc_link = sc_link;
		xs->retries = SD_RETRIES;
		xs->timeout = 10000;	/* 10000 millisecs for a disk ! */
		xs->cmd = (struct scsi_generic *) &cmd;
		xs->cmdlen = sizeof(cmd);
		xs->resid = 0;
		xs->error = XS_NOERROR;
		xs->bp = 0;
		xs->data = (u_char *) CADDR1;	/* XXX use pmap_enter() */
		xs->datalen = blkcnt * SECSIZE;

		/*
		 * Pass all this info to the scsi driver.
		 */
		retval = (*(sc_link->adapter->scsi_cmd)) (xs);
		switch (retval) {
		case SUCCESSFULLY_QUEUED:
		case HAD_ERROR:
			return (ENXIO);		/* we said not to sleep! */
		case COMPLETE:
			break;
		default:
			return (ENXIO);		/* we said not to sleep! */
		}

		if ((unsigned) addr % (1024 * 1024) == 0)
			printf("%ld ", num / 2048);
		/* update block count */
		num -= blkcnt;
		blknum += blkcnt;
		(int) addr += SECSIZE * blkcnt;

		/* operator aborting dump? */
		if (cncheckc())
			return (EINTR);
	}
	return (0);
}
OpenPOWER on IntegriCloud