summaryrefslogtreecommitdiffstats
path: root/drivers/message/i2o/i2o_scsi.c
blob: 1d31d7284cbd0b3e0de425ff5c56dd22677fb24a (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
/*
 * 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.
 *
 * For the avoidance of doubt the "preferred form" of this code is one which
 * is in an open non patent encumbered format. Where cryptographic key signing
 * forms part of the process of creating an executable the information
 * including keys needed to generate an equivalently functional executable
 * are deemed to be part of the source code.
 *
 *  Complications for I2O scsi
 *
 *	o	Each (bus,lun) is a logical device in I2O. We keep a map
 *		table. We spoof failed selection for unmapped units
 *	o	Request sense buffers can come back for free.
 *	o	Scatter gather is a bit dynamic. We have to investigate at
 *		setup time.
 *	o	Some of our resources are dynamically shared. The i2o core
 *		needs a message reservation protocol to avoid swap v net
 *		deadlocking. We need to back off queue requests.
 *
 *	In general the firmware wants to help. Where its help isn't performance
 *	useful we just ignore the aid. Its not worth the code in truth.
 *
 * Fixes/additions:
 *	Steve Ralston:
 *		Scatter gather now works
 *	Markus Lidel <Markus.Lidel@shadowconnect.com>:
 *		Minor fixes for 2.6.
 *
 * To Do:
 *	64bit cleanups
 *	Fix the resource management problems.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/i2o.h>
#include <linux/scatterlist.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <linux/atomic.h>

#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/sg.h>

#define OSM_NAME	"scsi-osm"
#define OSM_VERSION	"1.316"
#define OSM_DESCRIPTION	"I2O SCSI Peripheral OSM"

static struct i2o_driver i2o_scsi_driver;

static unsigned int i2o_scsi_max_id = 16;
static unsigned int i2o_scsi_max_lun = 255;

struct i2o_scsi_host {
	struct Scsi_Host *scsi_host;	/* pointer to the SCSI host */
	struct i2o_controller *iop;	/* pointer to the I2O controller */
	unsigned int lun;	/* lun's used for block devices */
	struct i2o_device *channel[0];	/* channel->i2o_dev mapping table */
};

static struct scsi_host_template i2o_scsi_host_template;

#define I2O_SCSI_CAN_QUEUE	4

/* SCSI OSM class handling definition */
static struct i2o_class_id i2o_scsi_class_id[] = {
	{I2O_CLASS_SCSI_PERIPHERAL},
	{I2O_CLASS_END}
};

static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
{
	struct i2o_scsi_host *i2o_shost;
	struct i2o_device *i2o_dev;
	struct Scsi_Host *scsi_host;
	int max_channel = 0;
	u8 type;
	int i;
	size_t size;
	u16 body_size = 6;

#ifdef CONFIG_I2O_EXT_ADAPTEC
	if (c->adaptec)
		body_size = 8;
#endif

	list_for_each_entry(i2o_dev, &c->devices, list)
	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
		if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
		    && (type == 0x01))	/* SCSI bus */
			max_channel++;
	}

	if (!max_channel) {
		osm_warn("no channels found on %s\n", c->name);
		return ERR_PTR(-EFAULT);
	}

	size = max_channel * sizeof(struct i2o_device *)
	    + sizeof(struct i2o_scsi_host);

	scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
	if (!scsi_host) {
		osm_warn("Could not allocate SCSI host\n");
		return ERR_PTR(-ENOMEM);
	}

	scsi_host->max_channel = max_channel - 1;
	scsi_host->max_id = i2o_scsi_max_id;
	scsi_host->max_lun = i2o_scsi_max_lun;
	scsi_host->this_id = c->unit;
	scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size);

	i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
	i2o_shost->scsi_host = scsi_host;
	i2o_shost->iop = c;
	i2o_shost->lun = 1;

	i = 0;
	list_for_each_entry(i2o_dev, &c->devices, list)
	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
		if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
		    && (type == 0x01))	/* only SCSI bus */
			i2o_shost->channel[i++] = i2o_dev;

		if (i >= max_channel)
			break;
	}

	return i2o_shost;
};

/**
 *	i2o_scsi_get_host - Get an I2O SCSI host
 *	@c: I2O controller to for which to get the SCSI host
 *
 *	If the I2O controller already exists as SCSI host, the SCSI host
 *	is returned, otherwise the I2O controller is added to the SCSI
 *	core.
 *
 *	Returns pointer to the I2O SCSI host on success or NULL on failure.
 */
static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
{
	return c->driver_data[i2o_scsi_driver.context];
};

/**
 *	i2o_scsi_remove - Remove I2O device from SCSI core
 *	@dev: device which should be removed
 *
 *	Removes the I2O device from the SCSI core again.
 *
 *	Returns 0 on success.
 */
static int i2o_scsi_remove(struct device *dev)
{
	struct i2o_device *i2o_dev = to_i2o_device(dev);
	struct i2o_controller *c = i2o_dev->iop;
	struct i2o_scsi_host *i2o_shost;
	struct scsi_device *scsi_dev;

	osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);

	i2o_shost = i2o_scsi_get_host(c);

	shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
	    if (scsi_dev->hostdata == i2o_dev) {
		sysfs_remove_link(&i2o_dev->device.kobj, "scsi");
		scsi_remove_device(scsi_dev);
		scsi_device_put(scsi_dev);
		break;
	}

	return 0;
};

/**
 *	i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
 *	@dev: device to verify if it is a I2O SCSI device
 *
 *	Retrieve channel, id and lun for I2O device. If everything goes well
 *	register the I2O device as SCSI device on the I2O SCSI controller.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static int i2o_scsi_probe(struct device *dev)
{
	struct i2o_device *i2o_dev = to_i2o_device(dev);
	struct i2o_controller *c = i2o_dev->iop;
	struct i2o_scsi_host *i2o_shost;
	struct Scsi_Host *scsi_host;
	struct i2o_device *parent;
	struct scsi_device *scsi_dev;
	u32 id = -1;
	u64 lun = -1;
	int channel = -1;
	int i, rc;

	i2o_shost = i2o_scsi_get_host(c);
	if (!i2o_shost)
		return -EFAULT;

	scsi_host = i2o_shost->scsi_host;

	switch (i2o_dev->lct_data.class_id) {
	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
	case I2O_CLASS_EXECUTIVE:
#ifdef CONFIG_I2O_EXT_ADAPTEC
		if (c->adaptec) {
			u8 type;
			struct i2o_device *d = i2o_shost->channel[0];

			if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1)
			    && (type == 0x01))	/* SCSI bus */
				if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) {
					channel = 0;
					if (i2o_dev->lct_data.class_id ==
					    I2O_CLASS_RANDOM_BLOCK_STORAGE)
						lun =
						    cpu_to_le64(i2o_shost->
								lun++);
					else
						lun = 0;
				}
		}
#endif
		break;

	case I2O_CLASS_SCSI_PERIPHERAL:
		if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4))
			return -EFAULT;

		if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8))
			return -EFAULT;

		parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
		if (!parent) {
			osm_warn("can not find parent of device %03x\n",
				 i2o_dev->lct_data.tid);
			return -EFAULT;
		}

		for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
			if (i2o_shost->channel[i] == parent)
				channel = i;
		break;

	default:
		return -EFAULT;
	}

	if (channel == -1) {
		osm_warn("can not find channel of device %03x\n",
			 i2o_dev->lct_data.tid);
		return -EFAULT;
	}

	if (le32_to_cpu(id) >= scsi_host->max_id) {
		osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)",
			 le32_to_cpu(id), scsi_host->max_id);
		return -EFAULT;
	}

	if (le64_to_cpu(lun) >= scsi_host->max_lun) {
		osm_warn("SCSI device lun (%lu) >= max_lun of I2O host (%d)",
			 (long unsigned int)le64_to_cpu(lun),
			 scsi_host->max_lun);
		return -EFAULT;
	}

	scsi_dev =
	    __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id),
			      le64_to_cpu(lun), i2o_dev);

	if (IS_ERR(scsi_dev)) {
		osm_warn("can not add SCSI device %03x\n",
			 i2o_dev->lct_data.tid);
		return PTR_ERR(scsi_dev);
	}

	rc = sysfs_create_link(&i2o_dev->device.kobj,
			       &scsi_dev->sdev_gendev.kobj, "scsi");
	if (rc)
		goto err;

	osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n",
		 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
		 (long unsigned int)le64_to_cpu(lun));

	return 0;

err:
	scsi_remove_device(scsi_dev);
	return rc;
};

static const char *i2o_scsi_info(struct Scsi_Host *SChost)
{
	struct i2o_scsi_host *hostdata;
	hostdata = (struct i2o_scsi_host *)SChost->hostdata;
	return hostdata->iop->name;
}

/**
 *	i2o_scsi_reply - SCSI OSM message reply handler
 *	@c: controller issuing the reply
 *	@m: message id for flushing
 *	@msg: the message from the controller
 *
 *	Process reply messages (interrupts in normal scsi controller think).
 *	We can get a variety of messages to process. The normal path is
 *	scsi command completions. We must also deal with IOP failures,
 *	the reply to a bus reset and the reply to a LUN query.
 *
 *	Returns 0 on success and if the reply should not be flushed or > 0
 *	on success and if the reply should be flushed. Returns negative error
 *	code on failure and if the reply should be flushed.
 */
static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
			  struct i2o_message *msg)
{
	struct scsi_cmnd *cmd;
	u32 error;
	struct device *dev;

	cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
	if (unlikely(!cmd)) {
		osm_err("NULL reply received!\n");
		return -1;
	}

	/*
	 *      Low byte is device status, next is adapter status,
	 *      (then one byte reserved), then request status.
	 */
	error = le32_to_cpu(msg->body[0]);

	osm_debug("Completed %0x%p\n", cmd);

	cmd->result = error & 0xff;
	/*
	 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
	 * the SCSI layer handle the error
	 */
	if (cmd->result)
		memcpy(cmd->sense_buffer, &msg->body[3],
		       min(SCSI_SENSE_BUFFERSIZE, 40));

	/* only output error code if AdapterStatus is not HBA_SUCCESS */
	if ((error >> 8) & 0xff)
		osm_err("SCSI error %08x\n", error);

	dev = &c->pdev->dev;

	scsi_dma_unmap(cmd);

	cmd->scsi_done(cmd);

	return 1;
};

/**
 *	i2o_scsi_notify_device_add - Retrieve notifications of added devices
 *	@i2o_dev: the I2O device which was added
 *
 *	If a I2O device is added we catch the notification, because I2O classes
 *	other than SCSI peripheral will not be received through
 *	i2o_scsi_probe().
 */
static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
{
	switch (i2o_dev->lct_data.class_id) {
	case I2O_CLASS_EXECUTIVE:
	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
		i2o_scsi_probe(&i2o_dev->device);
		break;

	default:
		break;
	}
};

/**
 *	i2o_scsi_notify_device_remove - Retrieve notifications of removed devices
 *	@i2o_dev: the I2O device which was removed
 *
 *	If a I2O device is removed, we catch the notification to remove the
 *	corresponding SCSI device.
 */
static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
{
	switch (i2o_dev->lct_data.class_id) {
	case I2O_CLASS_EXECUTIVE:
	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
		i2o_scsi_remove(&i2o_dev->device);
		break;

	default:
		break;
	}
};

/**
 *	i2o_scsi_notify_controller_add - Retrieve notifications of added controllers
 *	@c: the controller which was added
 *
 *	If a I2O controller is added, we catch the notification to add a
 *	corresponding Scsi_Host.
 */
static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
{
	struct i2o_scsi_host *i2o_shost;
	int rc;

	i2o_shost = i2o_scsi_host_alloc(c);
	if (IS_ERR(i2o_shost)) {
		osm_err("Could not initialize SCSI host\n");
		return;
	}

	rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
	if (rc) {
		osm_err("Could not add SCSI host\n");
		scsi_host_put(i2o_shost->scsi_host);
		return;
	}

	c->driver_data[i2o_scsi_driver.context] = i2o_shost;

	osm_debug("new I2O SCSI host added\n");
};

/**
 *	i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers
 *	@c: the controller which was removed
 *
 *	If a I2O controller is removed, we catch the notification to remove the
 *	corresponding Scsi_Host.
 */
static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
{
	struct i2o_scsi_host *i2o_shost;
	i2o_shost = i2o_scsi_get_host(c);
	if (!i2o_shost)
		return;

	c->driver_data[i2o_scsi_driver.context] = NULL;

	scsi_remove_host(i2o_shost->scsi_host);
	scsi_host_put(i2o_shost->scsi_host);
	osm_debug("I2O SCSI host removed\n");
};

/* SCSI OSM driver struct */
static struct i2o_driver i2o_scsi_driver = {
	.name = OSM_NAME,
	.reply = i2o_scsi_reply,
	.classes = i2o_scsi_class_id,
	.notify_device_add = i2o_scsi_notify_device_add,
	.notify_device_remove = i2o_scsi_notify_device_remove,
	.notify_controller_add = i2o_scsi_notify_controller_add,
	.notify_controller_remove = i2o_scsi_notify_controller_remove,
	.driver = {
		   .probe = i2o_scsi_probe,
		   .remove = i2o_scsi_remove,
		   },
};

/**
 *	i2o_scsi_queuecommand - queue a SCSI command
 *	@SCpnt: scsi command pointer
 *	@done: callback for completion
 *
 *	Issue a scsi command asynchronously. Return 0 on success or 1 if
 *	we hit an error (normally message queue congestion). The only
 *	minor complication here is that I2O deals with the device addressing
 *	so we have to map the bus/dev/lun back to an I2O handle as well
 *	as faking absent devices ourself.
 *
 *	Locks: takes the controller lock on error path only
 */

static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt,
				 void (*done) (struct scsi_cmnd *))
{
	struct i2o_controller *c;
	struct i2o_device *i2o_dev;
	int tid;
	struct i2o_message *msg;
	/*
	 * ENABLE_DISCONNECT
	 * SIMPLE_TAG
	 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
	 */
	u32 scsi_flags = 0x20a00000;
	u32 sgl_offset;
	u32 *mptr;
	u32 cmd = I2O_CMD_SCSI_EXEC << 24;
	int rc = 0;

	/*
	 *      Do the incoming paperwork
	 */
	i2o_dev = SCpnt->device->hostdata;

	SCpnt->scsi_done = done;

	if (unlikely(!i2o_dev)) {
		osm_warn("no I2O device in request\n");
		SCpnt->result = DID_NO_CONNECT << 16;
		done(SCpnt);
		goto exit;
	}
	c = i2o_dev->iop;
	tid = i2o_dev->lct_data.tid;

	osm_debug("qcmd: Tid = %03x\n", tid);
	osm_debug("Real scsi messages.\n");

	/*
	 *      Put together a scsi execscb message
	 */
	switch (SCpnt->sc_data_direction) {
	case PCI_DMA_NONE:
		/* DATA NO XFER */
		sgl_offset = SGL_OFFSET_0;
		break;

	case PCI_DMA_TODEVICE:
		/* DATA OUT (iop-->dev) */
		scsi_flags |= 0x80000000;
		sgl_offset = SGL_OFFSET_10;
		break;

	case PCI_DMA_FROMDEVICE:
		/* DATA IN  (iop<--dev) */
		scsi_flags |= 0x40000000;
		sgl_offset = SGL_OFFSET_10;
		break;

	default:
		/* Unknown - kill the command */
		SCpnt->result = DID_NO_CONNECT << 16;
		done(SCpnt);
		goto exit;
	}

	/*
	 *      Obtain an I2O message. If there are none free then
	 *      throw it back to the scsi layer
	 */

	msg = i2o_msg_get(c);
	if (IS_ERR(msg)) {
		rc = SCSI_MLQUEUE_HOST_BUSY;
		goto exit;
	}

	mptr = &msg->body[0];

#if 0 /* this code can't work */
#ifdef CONFIG_I2O_EXT_ADAPTEC
	if (c->adaptec) {
		u32 adpt_flags = 0;

		if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
			i2o_sg_io_hdr_t __user *usr_ptr =
			    ((Sg_request *) (SCpnt->sc_request->
					     upper_private_data))->header.
			    usr_ptr;

			if (usr_ptr)
				get_user(adpt_flags, &usr_ptr->flags);
		}

		switch (i2o_dev->lct_data.class_id) {
		case I2O_CLASS_EXECUTIVE:
		case I2O_CLASS_RANDOM_BLOCK_STORAGE:
			/* interpret flag has to be set for executive */
			adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
			break;

		default:
			break;
		}

		/*
		 * for Adaptec controllers we use the PRIVATE command, because
		 * the normal SCSI EXEC doesn't support all SCSI commands on
		 * all controllers (for example READ CAPACITY).
		 */
		if (sgl_offset == SGL_OFFSET_10)
			sgl_offset = SGL_OFFSET_12;
		cmd = I2O_CMD_PRIVATE << 24;
		*mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
		*mptr++ = cpu_to_le32(adpt_flags | tid);
	}
#endif
#endif

	msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
	msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context);

	/* We want the SCSI control block back */
	msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt));

	/* LSI_920_PCI_QUIRK
	 *
	 *      Intermittant observations of msg frame word data corruption
	 *      observed on msg[4] after:
	 *        WRITE, READ-MODIFY-WRITE
	 *      operations.  19990606 -sralston
	 *
	 *      (Hence we build this word via tag. Its good practice anyway
	 *       we don't want fetches over PCI needlessly)
	 */

	/* Attach tags to the devices */
	/* FIXME: implement
	   if(SCpnt->device->tagged_supported) {
	   if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
	   scsi_flags |= 0x01000000;
	   else if(SCpnt->tag == ORDERED_QUEUE_TAG)
	   scsi_flags |= 0x01800000;
	   }
	 */

	*mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len);

	/* Write SCSI command into the message - always 16 byte block */
	memcpy(mptr, SCpnt->cmnd, 16);
	mptr += 4;

	if (sgl_offset != SGL_OFFSET_0) {
		/* write size of data addressed by SGL */
		*mptr++ = cpu_to_le32(scsi_bufflen(SCpnt));

		/* Now fill in the SGList and command */

		if (scsi_sg_count(SCpnt)) {
			if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt),
					    scsi_sg_count(SCpnt),
					    SCpnt->sc_data_direction, &mptr))
				goto nomem;
		}
	}

	/* Stick the headers on */
	msg->u.head[0] =
	    cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);

	/* Queue the message */
	i2o_msg_post(c, msg);

	osm_debug("Issued %0x%p\n", SCpnt);

	return 0;

      nomem:
	rc = -ENOMEM;
	i2o_msg_nop(c, msg);

      exit:
	return rc;
}

static DEF_SCSI_QCMD(i2o_scsi_queuecommand)

/**
 *	i2o_scsi_abort - abort a running command
 *	@SCpnt: command to abort
 *
 *	Ask the I2O controller to abort a command. This is an asynchrnous
 *	process and our callback handler will see the command complete with an
 *	aborted message if it succeeds.
 *
 *	Returns 0 if the command is successfully aborted or negative error code
 *	on failure.
 */
static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
{
	struct i2o_device *i2o_dev;
	struct i2o_controller *c;
	struct i2o_message *msg;
	int tid;
	int status = FAILED;

	osm_warn("Aborting command block.\n");

	i2o_dev = SCpnt->device->hostdata;
	c = i2o_dev->iop;
	tid = i2o_dev->lct_data.tid;

	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
	if (IS_ERR(msg))
		return SCSI_MLQUEUE_HOST_BUSY;

	msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
	msg->u.head[1] =
	    cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid);
	msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt));

	if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT))
		status = SUCCESS;

	return status;
}

/**
 *	i2o_scsi_bios_param	-	Invent disk geometry
 *	@sdev: scsi device
 *	@dev: block layer device
 *	@capacity: size in sectors
 *	@ip: geometry array
 *
 *	This is anyone's guess quite frankly. We use the same rules everyone
 *	else appears to and hope. It seems to work.
 */

static int i2o_scsi_bios_param(struct scsi_device *sdev,
			       struct block_device *dev, sector_t capacity,
			       int *ip)
{
	int size;

	size = capacity;
	ip[0] = 64;		/* heads                        */
	ip[1] = 32;		/* sectors                      */
	if ((ip[2] = size >> 11) > 1024) {	/* cylinders, test for big disk */
		ip[0] = 255;	/* heads                        */
		ip[1] = 63;	/* sectors                      */
		ip[2] = size / (255 * 63);	/* cylinders                    */
	}
	return 0;
}

static struct scsi_host_template i2o_scsi_host_template = {
	.proc_name = OSM_NAME,
	.name = OSM_DESCRIPTION,
	.info = i2o_scsi_info,
	.queuecommand = i2o_scsi_queuecommand,
	.eh_abort_handler = i2o_scsi_abort,
	.bios_param = i2o_scsi_bios_param,
	.can_queue = I2O_SCSI_CAN_QUEUE,
	.sg_tablesize = 8,
	.cmd_per_lun = 6,
	.use_clustering = ENABLE_CLUSTERING,
};

/**
 *	i2o_scsi_init - SCSI OSM initialization function
 *
 *	Register SCSI OSM into I2O core.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static int __init i2o_scsi_init(void)
{
	int rc;

	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");

	/* Register SCSI OSM into I2O core */
	rc = i2o_driver_register(&i2o_scsi_driver);
	if (rc) {
		osm_err("Could not register SCSI driver\n");
		return rc;
	}

	return 0;
};

/**
 *	i2o_scsi_exit - SCSI OSM exit function
 *
 *	Unregisters SCSI OSM from I2O core.
 */
static void __exit i2o_scsi_exit(void)
{
	/* Unregister I2O SCSI OSM from I2O core */
	i2o_driver_unregister(&i2o_scsi_driver);
};

MODULE_AUTHOR("Red Hat Software");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(OSM_DESCRIPTION);
MODULE_VERSION(OSM_VERSION);

module_init(i2o_scsi_init);
module_exit(i2o_scsi_exit);
OpenPOWER on IntegriCloud