ide-scsi.c 24 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
3
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
Linus Torvalds's avatar
Linus Torvalds committed
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
 */

/*
 * Emulation of a SCSI host adapter for IDE ATAPI devices.
 *
 * With this driver, one can use the Linux SCSI drivers instead of the
 * native IDE ATAPI drivers.
 *
 * Ver 0.1   Dec  3 96   Initial version.
 * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
 *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
 *                        to Janos Farkas for pointing this out.
 *                       Avoid using bitfields in structures for m68k.
 *                       Added Scatter/Gather and DMA support.
 * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
 *                       Use variable timeout for each command.
 * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
 *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
 * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
 *                        for access through /dev/sg.
 *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
 * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
 *                        detection of devices with CONFIG_SCSI_MULTI_LUN
 * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
 * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
 * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
 * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
 */

#define IDESCSI_VERSION "0.92"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/slab.h>
#include <linux/ide.h>
#include <linux/scatterlist.h>
47
#include <linux/delay.h>
48
#include <linux/mutex.h>
Jiri Slaby's avatar
Jiri Slaby committed
49
#include <linux/bitops.h>
Linus Torvalds's avatar
Linus Torvalds committed
50
51
52
53
54
55
56
57
58
59
60
61
62

#include <asm/io.h>
#include <asm/uaccess.h>

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

#define IDESCSI_DEBUG_LOG		0

63
64
65
66
67
68
69
#if IDESCSI_DEBUG_LOG
#define debug_log(fmt, args...) \
	printk(KERN_INFO "ide-scsi: " fmt, ## args)
#else
#define debug_log(fmt, args...) do {} while (0)
#endif

Linus Torvalds's avatar
Linus Torvalds committed
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/*
 *	SCSI command transformation layer
 */
#define IDESCSI_SG_TRANSFORM		1	/* /dev/sg transformation */

/*
 *	Log flags
 */
#define IDESCSI_LOG_CMD			0	/* Log SCSI commands */

typedef struct ide_scsi_obj {
	ide_drive_t		*drive;
	ide_driver_t		*driver;
	struct gendisk		*disk;
	struct Scsi_Host	*host;

86
	struct ide_atapi_pc *pc;		/* Current packet command */
Linus Torvalds's avatar
Linus Torvalds committed
87
88
89
90
91
	unsigned long flags;			/* Status/Action flags */
	unsigned long transform;		/* SCSI cmd translation layer */
	unsigned long log;			/* log flags */
} idescsi_scsi_t;

92
static DEFINE_MUTEX(idescsi_ref_mutex);
93
94
/* Set by module param to skip cd */
static int idescsi_nocd;
Linus Torvalds's avatar
Linus Torvalds committed
95
96
97
98
99
100
101
102

#define ide_scsi_g(disk) \
	container_of((disk)->private_data, struct ide_scsi_obj, driver)

static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
{
	struct ide_scsi_obj *scsi = NULL;

103
	mutex_lock(&idescsi_ref_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
104
105
106
	scsi = ide_scsi_g(disk);
	if (scsi)
		scsi_host_get(scsi->host);
107
	mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
108
109
110
111
112
	return scsi;
}

static void ide_scsi_put(struct ide_scsi_obj *scsi)
{
113
	mutex_lock(&idescsi_ref_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
114
	scsi_host_put(scsi->host);
115
	mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
}

static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
{
	return (idescsi_scsi_t*) (&host[1]);
}

static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
{
	return scsihost_to_idescsi(ide_drive->driver_data);
}

/*
 *	Per ATAPI device status bits.
 */
#define IDESCSI_DRQ_INTERRUPT		0	/* DRQ interrupt device */

/*
 *	ide-scsi requests.
 */
#define IDESCSI_PC_RQ			90

/*
139
 *	PIO data transfer routine using the scatter gather table.
Linus Torvalds's avatar
Linus Torvalds committed
140
 */
141
142
static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
				unsigned int bcount, int write)
Linus Torvalds's avatar
Linus Torvalds committed
143
{
144
	ide_hwif_t *hwif = drive->hwif;
145
146
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
Linus Torvalds's avatar
Linus Torvalds committed
147
148
149
150
151
	char *buf;
	int count;

	while (bcount) {
		count = min(pc->sg->length - pc->b_count, bcount);
152
		if (PageHighMem(sg_page(pc->sg))) {
153
154
155
			unsigned long flags;

			local_irq_save(flags);
156
			buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
157
158
					  pc->sg->offset;
			xf(drive, NULL, buf + pc->b_count, count);
159
160
161
			kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
			local_irq_restore(flags);
		} else {
162
			buf = sg_virt(pc->sg);
163
			xf(drive, NULL, buf + pc->b_count, count);
164
165
		}
		bcount -= count; pc->b_count += count;
Linus Torvalds's avatar
Linus Torvalds committed
166
		if (pc->b_count == pc->sg->length) {
167
			if (!--pc->sg_cnt)
Jens Axboe's avatar
Jens Axboe committed
168
169
				break;
			pc->sg = sg_next(pc->sg);
Linus Torvalds's avatar
Linus Torvalds committed
170
171
172
			pc->b_count = 0;
		}
	}
Jens Axboe's avatar
Jens Axboe committed
173
174

	if (bcount) {
175
176
177
178
		printk(KERN_ERR "%s: scatter gather table too small, %s\n",
				drive->name, write ? "padding with zeros"
						   : "discarding data");
		ide_pad_transfer(drive, write, bcount);
Jens Axboe's avatar
Jens Axboe committed
179
	}
Linus Torvalds's avatar
Linus Torvalds committed
180
181
}

182
183
184
185
186
static void ide_scsi_hex_dump(u8 *data, int len)
{
	print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
}

187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
static int idescsi_end_request(ide_drive_t *, int, int);

static void ide_scsi_callback(ide_drive_t *drive)
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
	struct ide_atapi_pc *pc = scsi->pc;

	if (pc->flags & PC_FLAG_TIMEDOUT)
		debug_log("%s: got timed out packet %lu at %lu\n", __func__,
			  pc->scsi_cmd->serial_number, jiffies);
		/* end this request now - scsi should retry it*/
	else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
		printk(KERN_INFO "Packet command completed, %d bytes"
				 " transferred\n", pc->xferred);

	idescsi_end_request(drive, 1, 0);
}

205
206
static int idescsi_check_condition(ide_drive_t *drive,
		struct request *failed_cmd)
Linus Torvalds's avatar
Linus Torvalds committed
207
208
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
209
	struct ide_atapi_pc   *pc;
Linus Torvalds's avatar
Linus Torvalds committed
210
211
212
213
	struct request *rq;
	u8             *buf;

	/* stuff a sense request in front of our current request */
214
	pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
215
216
217
	rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
	buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
	if (!pc || !rq || !buf) {
218
219
220
		kfree(buf);
		kfree(rq);
		kfree(pc);
Linus Torvalds's avatar
Linus Torvalds committed
221
222
		return -ENOMEM;
	}
223
	blk_rq_init(NULL, rq);
Linus Torvalds's avatar
Linus Torvalds committed
224
225
	rq->special = (char *) pc;
	pc->rq = rq;
226
	pc->buf = buf;
Linus Torvalds's avatar
Linus Torvalds committed
227
	pc->c[0] = REQUEST_SENSE;
228
	pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
229
	rq->cmd_type = REQ_TYPE_SENSE;
230
	rq->cmd_flags |= REQ_PREEMPT;
Linus Torvalds's avatar
Linus Torvalds committed
231
232
	pc->timeout = jiffies + WAIT_READY;
	/* NOTE! Save the failed packet command in "rq->buffer" */
233
234
	rq->buffer = (void *) failed_cmd->special;
	pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
Linus Torvalds's avatar
Linus Torvalds committed
235
236
	if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
		printk ("ide-scsi: %s: queue cmd = ", drive->name);
237
		ide_scsi_hex_dump(pc->c, 6);
Linus Torvalds's avatar
Linus Torvalds committed
238
239
	}
	rq->rq_disk = scsi->disk;
240
	memcpy(rq->cmd, pc->c, 12);
241
242
	ide_do_drive_cmd(drive, rq);
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
243
244
245
246
247
}

static ide_startstop_t
idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
{
248
249
	ide_hwif_t *hwif = drive->hwif;

250
	if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
Linus Torvalds's avatar
Linus Torvalds committed
251
		/* force an abort */
252
		hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
Linus Torvalds's avatar
Linus Torvalds committed
253
254
255
256
257
258
259
260
261
262
263
264

	rq->errors++;

	idescsi_end_request(drive, 0, 0);

	return ide_stopped;
}

static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
	struct request *rq = HWGROUP(drive)->rq;
265
	struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
Linus Torvalds's avatar
Linus Torvalds committed
266
267
	int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
	struct Scsi_Host *host;
268
	int errors = rq->errors;
Linus Torvalds's avatar
Linus Torvalds committed
269
270
	unsigned long flags;

271
	if (!blk_special_request(rq) && !blk_sense_request(rq)) {
Linus Torvalds's avatar
Linus Torvalds committed
272
273
274
275
		ide_end_request(drive, uptodate, nrsecs);
		return 0;
	}
	ide_end_drive_cmd (drive, 0, 0);
276
	if (blk_sense_request(rq)) {
277
		struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
Linus Torvalds's avatar
Linus Torvalds committed
278
279
		if (log) {
			printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
280
			ide_scsi_hex_dump(pc->buf, 16);
Linus Torvalds's avatar
Linus Torvalds committed
281
		}
282
283
284
		memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
			SCSI_SENSE_BUFFERSIZE);
		kfree(pc->buf);
Linus Torvalds's avatar
Linus Torvalds committed
285
286
287
288
289
		kfree(pc);
		kfree(rq);
		pc = opc;
		rq = pc->rq;
		pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
290
291
292
293
				(((pc->flags & PC_FLAG_TIMEDOUT) ?
				  DID_TIME_OUT :
				  DID_OK) << 16);
	} else if (pc->flags & PC_FLAG_TIMEDOUT) {
Linus Torvalds's avatar
Linus Torvalds committed
294
295
296
297
		if (log)
			printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
					drive->name, pc->scsi_cmd->serial_number);
		pc->scsi_cmd->result = DID_TIME_OUT << 16;
298
	} else if (errors >= ERROR_MAX) {
Linus Torvalds's avatar
Linus Torvalds committed
299
300
301
		pc->scsi_cmd->result = DID_ERROR << 16;
		if (log)
			printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
302
	} else if (errors) {
Linus Torvalds's avatar
Linus Torvalds committed
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
		if (log)
			printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
		if (!idescsi_check_condition(drive, rq))
			/* we started a request sense, so we'll be back, exit for now */
			return 0;
		pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
	} else {
		pc->scsi_cmd->result = DID_OK << 16;
	}
	host = pc->scsi_cmd->device->host;
	spin_lock_irqsave(host->host_lock, flags);
	pc->done(pc->scsi_cmd);
	spin_unlock_irqrestore(host->host_lock, flags);
	kfree(pc);
	kfree(rq);
	scsi->pc = NULL;
	return 0;
}

322
static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
Linus Torvalds's avatar
Linus Torvalds committed
323
324
325
326
327
328
{
	return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
}

static int idescsi_expiry(ide_drive_t *drive)
{
329
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
330
	struct ide_atapi_pc   *pc   = scsi->pc;
Linus Torvalds's avatar
Linus Torvalds committed
331

332
333
334
	debug_log("%s called for %lu at %lu\n", __func__,
		  pc->scsi_cmd->serial_number, jiffies);

335
	pc->flags |= PC_FLAG_TIMEDOUT;
Linus Torvalds's avatar
Linus Torvalds committed
336
337
338
339
340
341
342
343
344
345

	return 0;					/* we do not want the ide subsystem to retry */
}

/*
 *	Our interrupt handler.
 */
static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
346
	struct ide_atapi_pc *pc = scsi->pc;
Linus Torvalds's avatar
Linus Torvalds committed
347

348
349
350
	return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
			   idescsi_expiry, NULL, NULL, NULL,
			   ide_scsi_io_buffers);
Linus Torvalds's avatar
Linus Torvalds committed
351
352
353
354
355
}

static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);
356

357
358
	return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
			       get_timeout(scsi->pc), idescsi_expiry);
Linus Torvalds's avatar
Linus Torvalds committed
359
360
}

361
static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
Linus Torvalds's avatar
Linus Torvalds committed
362
363
364
{
	switch (pc->c[0]) {
		case READ_6: case READ_10: case READ_12:
365
			pc->flags &= ~PC_FLAG_WRITING;
Linus Torvalds's avatar
Linus Torvalds committed
366
367
			return 0;
		case WRITE_6: case WRITE_10: case WRITE_12:
368
			pc->flags |= PC_FLAG_WRITING;
Linus Torvalds's avatar
Linus Torvalds committed
369
370
371
372
373
374
			return 0;
		default:
			return 1;
	}
}

375
static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
Linus Torvalds's avatar
Linus Torvalds committed
376
377
378
379
380
{
	ide_hwif_t *hwif = drive->hwif;
	struct scatterlist *sg, *scsi_sg;
	int segments;

381
	if (!pc->req_xfer || pc->req_xfer % 1024)
Linus Torvalds's avatar
Linus Torvalds committed
382
383
384
385
386
387
		return 1;

	if (idescsi_set_direction(pc))
		return 1;

	sg = hwif->sg_table;
388
389
	scsi_sg = scsi_sglist(pc->scsi_cmd);
	segments = scsi_sg_count(pc->scsi_cmd);
Linus Torvalds's avatar
Linus Torvalds committed
390
391
392
393

	if (segments > hwif->sg_max_nents)
		return 1;

394
395
	hwif->sg_nents = segments;
	memcpy(sg, scsi_sg, sizeof(*sg) * segments);
Linus Torvalds's avatar
Linus Torvalds committed
396
397
398
399

	return 0;
}

400
401
static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
		struct ide_atapi_pc *pc)
Linus Torvalds's avatar
Linus Torvalds committed
402
403
404
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);

405
406
	/* Set the current packet command */
	scsi->pc = pc;
Linus Torvalds's avatar
Linus Torvalds committed
407

408
409
	return ide_issue_pc(drive, pc, idescsi_transfer_pc,
			    get_timeout(pc), idescsi_expiry);
Linus Torvalds's avatar
Linus Torvalds committed
410
411
412
413
414
415
416
}

/*
 *	idescsi_do_request is our request handling function.
 */
static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
{
417
418
419
420
	debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
		  rq->cmd[0], rq->errors);
	debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
		  rq->sector, rq->nr_sectors, rq->current_nr_sectors);
Linus Torvalds's avatar
Linus Torvalds committed
421

422
	if (blk_sense_request(rq) || blk_special_request(rq)) {
423
		struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
424
425
426
427
		idescsi_scsi_t *scsi = drive_to_idescsi(drive);

		if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags))
			pc->flags |= PC_FLAG_DRQ_INTERRUPT;
428
429
430
431
432

		if (drive->using_dma && !idescsi_map_sg(drive, pc))
			pc->flags |= PC_FLAG_DMA_OK;

		return idescsi_issue_pc(drive, pc);
Linus Torvalds's avatar
Linus Torvalds committed
433
434
435
436
437
438
	}
	blk_dump_rq_flags(rq, "ide-scsi: unsup command");
	idescsi_end_request (drive, 0, 0);
	return ide_stopped;
}

439
#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds's avatar
Linus Torvalds committed
440
441
442
443
444
static void idescsi_add_settings(ide_drive_t *drive)
{
	idescsi_scsi_t *scsi = drive_to_idescsi(drive);

/*
445
 *			drive	setting name	read/write	data type	min	max	mul_factor	div_factor	data pointer		set function
Linus Torvalds's avatar
Linus Torvalds committed
446
 */
447
448
449
450
451
	ide_add_setting(drive,	"bios_cyl",	SETTING_RW,	TYPE_INT,	0,	1023,	1,		1,		&drive->bios_cyl,	NULL);
	ide_add_setting(drive,	"bios_head",	SETTING_RW,	TYPE_BYTE,	0,	255,	1,		1,		&drive->bios_head,	NULL);
	ide_add_setting(drive,	"bios_sect",	SETTING_RW,	TYPE_BYTE,	0,	63,	1,		1,		&drive->bios_sect,	NULL);
	ide_add_setting(drive,	"transform",	SETTING_RW,	TYPE_INT,	0,	3,	1,		1,		&scsi->transform,	NULL);
	ide_add_setting(drive,	"log",		SETTING_RW,	TYPE_INT,	0,	1,	1,		1,		&scsi->log,		NULL);
Linus Torvalds's avatar
Linus Torvalds committed
452
}
453
454
455
#else
static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
#endif
Linus Torvalds's avatar
Linus Torvalds committed
456
457
458
459
460
461
462
463
464
465
466
467

/*
 *	Driver initialization.
 */
static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
{
	if (drive->id && (drive->id->config & 0x0060) == 0x20)
		set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
	clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
#if IDESCSI_DEBUG_LOG
	set_bit(IDESCSI_LOG_CMD, &scsi->log);
#endif /* IDESCSI_DEBUG_LOG */
468
469
470

	drive->pc_callback = ide_scsi_callback;

Linus Torvalds's avatar
Linus Torvalds committed
471
472
473
	idescsi_add_settings(drive);
}

474
static void ide_scsi_remove(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
475
476
477
478
479
{
	struct Scsi_Host *scsihost = drive->driver_data;
	struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
	struct gendisk *g = scsi->disk;

480
	scsi_remove_host(scsihost);
481
	ide_proc_unregister_driver(drive, scsi->driver);
Linus Torvalds's avatar
Linus Torvalds committed
482
483
484
485
486
487
488
489

	ide_unregister_region(g);

	drive->driver_data = NULL;
	g->private_data = NULL;
	put_disk(g);

	ide_scsi_put(scsi);
490
491

	drive->scsi = 0;
Linus Torvalds's avatar
Linus Torvalds committed
492
493
}

494
static int ide_scsi_probe(ide_drive_t *);
Linus Torvalds's avatar
Linus Torvalds committed
495

496
#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds's avatar
Linus Torvalds committed
497
498
499
500
501
502
503
static ide_proc_entry_t idescsi_proc[] = {
	{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
	{ NULL, 0, NULL, NULL }
};
#endif

static ide_driver_t idescsi_driver = {
504
	.gen_driver = {
505
		.owner		= THIS_MODULE,
506
507
508
		.name		= "ide-scsi",
		.bus		= &ide_bus_type,
	},
509
510
	.probe			= ide_scsi_probe,
	.remove			= ide_scsi_remove,
Linus Torvalds's avatar
Linus Torvalds committed
511
512
513
514
515
516
	.version		= IDESCSI_VERSION,
	.media			= ide_scsi,
	.supports_dsc_overlap	= 0,
	.do_request		= idescsi_do_request,
	.end_request		= idescsi_end_request,
	.error                  = idescsi_atapi_error,
517
518
519
#ifdef CONFIG_IDE_PROC_FS
	.proc			= idescsi_proc,
#endif
Linus Torvalds's avatar
Linus Torvalds committed
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
};

static int idescsi_ide_open(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct ide_scsi_obj *scsi;

	if (!(scsi = ide_scsi_get(disk)))
		return -ENXIO;

	return 0;
}

static int idescsi_ide_release(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct ide_scsi_obj *scsi = ide_scsi_g(disk);

	ide_scsi_put(scsi);

	return 0;
}

static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
	return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
}

static struct block_device_operations idescsi_ops = {
	.owner		= THIS_MODULE,
	.open		= idescsi_ide_open,
	.release	= idescsi_ide_release,
	.ioctl		= idescsi_ide_ioctl,
};

static int idescsi_slave_configure(struct scsi_device * sdp)
{
	/* Configure detected device */
561
562
	sdp->use_10_for_rw = 1;
	sdp->use_10_for_ms = 1;
Linus Torvalds's avatar
Linus Torvalds committed
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
	scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
	return 0;
}

static const char *idescsi_info (struct Scsi_Host *host)
{
	return "SCSI host adapter emulation for IDE ATAPI devices";
}

static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
{
	idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);

	if (cmd == SG_SET_TRANSFORM) {
		if (arg)
			set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
		else
			clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
		return 0;
	} else if (cmd == SG_GET_TRANSFORM)
		return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
	return -EINVAL;
}

static int idescsi_queue (struct scsi_cmnd *cmd,
		void (*done)(struct scsi_cmnd *))
{
	struct Scsi_Host *host = cmd->device->host;
	idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
	ide_drive_t *drive = scsi->drive;
	struct request *rq = NULL;
594
	struct ide_atapi_pc *pc = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
595
596

	if (!drive) {
597
		scmd_printk (KERN_ERR, cmd, "drive not present\n");
Linus Torvalds's avatar
Linus Torvalds committed
598
599
600
		goto abort;
	}
	scsi = drive_to_idescsi(drive);
601
602
	pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
	rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
Linus Torvalds's avatar
Linus Torvalds committed
603
604
605
606
607
608
609
	if (rq == NULL || pc == NULL) {
		printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
		goto abort;
	}

	memset (pc->c, 0, 12);
	pc->flags = 0;
610
611
	if (cmd->sc_data_direction == DMA_TO_DEVICE)
		pc->flags |= PC_FLAG_WRITING;
Linus Torvalds's avatar
Linus Torvalds committed
612
613
	pc->rq = rq;
	memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
614
	pc->buf = NULL;
615
	pc->sg = scsi_sglist(cmd);
616
	pc->sg_cnt = scsi_sg_count(cmd);
Linus Torvalds's avatar
Linus Torvalds committed
617
	pc->b_count = 0;
618
	pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
Linus Torvalds's avatar
Linus Torvalds committed
619
620
621
622
623
624
	pc->scsi_cmd = cmd;
	pc->done = done;
	pc->timeout = jiffies + cmd->timeout_per_command;

	if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
		printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
625
		ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
Linus Torvalds's avatar
Linus Torvalds committed
626
627
		if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
			printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
628
			ide_scsi_hex_dump(pc->c, 12);
Linus Torvalds's avatar
Linus Torvalds committed
629
630
631
		}
	}

632
	blk_rq_init(NULL, rq);
Linus Torvalds's avatar
Linus Torvalds committed
633
	rq->special = (char *) pc;
634
	rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds's avatar
Linus Torvalds committed
635
	spin_unlock_irq(host->host_lock);
636
	memcpy(rq->cmd, pc->c, 12);
637
	blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
638
639
640
	spin_lock_irq(host->host_lock);
	return 0;
abort:
641
642
	kfree (pc);
	kfree (rq);
Linus Torvalds's avatar
Linus Torvalds committed
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
	cmd->result = DID_ERROR << 16;
	done(cmd);
	return 0;
}

static int idescsi_eh_abort (struct scsi_cmnd *cmd)
{
	idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
	ide_drive_t    *drive = scsi->drive;
	int		busy;
	int             ret   = FAILED;

	/* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */

	if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
		printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);

	if (!drive) {
		printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
		WARN_ON(1);
		goto no_drive;
	}

	/* First give it some more time, how much is "right" is hard to say :-( */

	busy = ide_wait_not_busy(HWIF(drive), 100);	/* FIXME - uses mdelay which causes latency? */
	if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
		printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");

	spin_lock_irq(&ide_lock);

	/* If there is no pc running we're done (our interrupt took care of it) */
	if (!scsi->pc) {
		ret = SUCCESS;
		goto ide_unlock;
	}

	/* It's somewhere in flight. Does ide subsystem agree? */
	if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
	    elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
		/*
		 * FIXME - not sure this condition can ever occur
		 */
		printk (KERN_ERR "ide-scsi: cmd aborted!\n");

688
		if (blk_sense_request(scsi->pc->rq))
689
			kfree(scsi->pc->buf);
Linus Torvalds's avatar
Linus Torvalds committed
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
		kfree(scsi->pc->rq);
		kfree(scsi->pc);
		scsi->pc = NULL;

		ret = SUCCESS;
	}

ide_unlock:
	spin_unlock_irq(&ide_lock);
no_drive:
	if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
		printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");

	return ret;
}

static int idescsi_eh_reset (struct scsi_cmnd *cmd)
{
	struct request *req;
	idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
	ide_drive_t    *drive = scsi->drive;
	int             ready = 0;
	int             ret   = SUCCESS;

	/* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */

	if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
		printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);

	if (!drive) {
		printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
		WARN_ON(1);
		return FAILED;
	}

725
726
	spin_lock_irq(cmd->device->host->host_lock);
	spin_lock(&ide_lock);
Linus Torvalds's avatar
Linus Torvalds committed
727
728
729
730

	if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
		printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
		spin_unlock(&ide_lock);
731
		spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds's avatar
Linus Torvalds committed
732
733
734
735
		return FAILED;
	}

	/* kill current request */
736
737
	if (__blk_end_request(req, -EIO, 0))
		BUG();
738
	if (blk_sense_request(req))
739
		kfree(scsi->pc->buf);
Linus Torvalds's avatar
Linus Torvalds committed
740
741
742
743
744
745
	kfree(scsi->pc);
	scsi->pc = NULL;
	kfree(req);

	/* now nuke the drive queue */
	while ((req = elv_next_request(drive->queue))) {
746
747
		if (__blk_end_request(req, -EIO, 0))
			BUG();
Linus Torvalds's avatar
Linus Torvalds committed
748
749
750
751
752
	}

	HWGROUP(drive)->rq = NULL;
	HWGROUP(drive)->handler = NULL;
	HWGROUP(drive)->busy = 1;		/* will set this to zero when ide reset finished */
753
	spin_unlock(&ide_lock);
Linus Torvalds's avatar
Linus Torvalds committed
754
755
756
757
758
759
760

	ide_do_reset(drive);

	/* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */

	do {
		spin_unlock_irq(cmd->device->host->host_lock);
761
		msleep(50);
Linus Torvalds's avatar
Linus Torvalds committed
762
763
764
765
766
767
768
769
770
771
		spin_lock_irq(cmd->device->host->host_lock);
	} while ( HWGROUP(drive)->handler );

	ready = drive_is_ready(drive);
	HWGROUP(drive)->busy--;
	if (!ready) {
		printk (KERN_ERR "ide-scsi: reset failed!\n");
		ret = FAILED;
	}

772
	spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds's avatar
Linus Torvalds committed
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
	return ret;
}

static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
		sector_t capacity, int *parm)
{
	idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
	ide_drive_t *drive = idescsi->drive;

	if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
		parm[0] = drive->bios_head;
		parm[1] = drive->bios_sect;
		parm[2] = drive->bios_cyl;
	}
	return 0;
}

static struct scsi_host_template idescsi_template = {
	.module			= THIS_MODULE,
	.name			= "idescsi",
	.info			= idescsi_info,
	.slave_configure        = idescsi_slave_configure,
	.ioctl			= idescsi_ioctl,
	.queuecommand		= idescsi_queue,
	.eh_abort_handler	= idescsi_eh_abort,
	.eh_host_reset_handler  = idescsi_eh_reset,
	.bios_param		= idescsi_bios,
	.can_queue		= 40,
	.this_id		= -1,
	.sg_tablesize		= 256,
	.cmd_per_lun		= 5,
	.max_sectors		= 128,
	.use_clustering		= DISABLE_CLUSTERING,
	.emulated		= 1,
	.proc_name		= "ide-scsi",
};

810
static int ide_scsi_probe(ide_drive_t *drive)
Linus Torvalds's avatar
Linus Torvalds committed
811
812
813
814
815
816
817
818
819
820
821
822
{
	idescsi_scsi_t *idescsi;
	struct Scsi_Host *host;
	struct gendisk *g;
	static int warned;
	int err = -ENOMEM;

	if (!warned && drive->media == ide_cdrom) {
		printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
		warned = 1;
	}

823
824
825
	if (idescsi_nocd && drive->media == ide_cdrom)
		return -ENODEV;

Linus Torvalds's avatar
Linus Torvalds committed
826
827
828
829
	if (!strstr("ide-scsi", drive->driver_req) ||
	    !drive->present ||
	    drive->media == ide_disk ||
	    !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
830
		return -ENODEV;
Linus Torvalds's avatar
Linus Torvalds committed
831

832
833
	drive->scsi = 1;

Linus Torvalds's avatar
Linus Torvalds committed
834
835
836
837
838
839
840
841
842
	g = alloc_disk(1 << PARTN_BITS);
	if (!g)
		goto out_host_put;

	ide_init_disk(g, drive);

	host->max_id = 1;

	if (drive->id->last_lun)
843
844
845
		debug_log("%s: id->last_lun=%u\n", drive->name,
			  drive->id->last_lun);

Linus Torvalds's avatar
Linus Torvalds committed
846
847
848
849
850
851
852
853
854
855
856
857
	if ((drive->id->last_lun & 0x7) != 7)
		host->max_lun = (drive->id->last_lun & 0x7) + 1;
	else
		host->max_lun = 1;

	drive->driver_data = host;
	idescsi = scsihost_to_idescsi(host);
	idescsi->drive = drive;
	idescsi->driver = &idescsi_driver;
	idescsi->host = host;
	idescsi->disk = g;
	g->private_data = &idescsi->driver;
858
	ide_proc_register_driver(drive, &idescsi_driver);
859
860
861
862
863
	err = 0;
	idescsi_setup(drive, idescsi);
	g->fops = &idescsi_ops;
	ide_register_region(g);
	err = scsi_add_host(host, &drive->gendev);
Linus Torvalds's avatar
Linus Torvalds committed
864
	if (!err) {
865
866
		scsi_scan_host(host);
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
867
	}
868
869
	/* fall through on error */
	ide_unregister_region(g);
870
	ide_proc_unregister_driver(drive, &idescsi_driver);
Linus Torvalds's avatar
Linus Torvalds committed
871
872
873

	put_disk(g);
out_host_put:
874
	drive->scsi = 0;
Linus Torvalds's avatar
Linus Torvalds committed
875
876
877
878
879
880
	scsi_host_put(host);
	return err;
}

static int __init init_idescsi_module(void)
{
881
	return driver_register(&idescsi_driver.gen_driver);
Linus Torvalds's avatar
Linus Torvalds committed
882
883
884
885
}

static void __exit exit_idescsi_module(void)
{
886
	driver_unregister(&idescsi_driver.gen_driver);
Linus Torvalds's avatar
Linus Torvalds committed
887
888
}

889
890
module_param(idescsi_nocd, int, 0600);
MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
Linus Torvalds's avatar
Linus Torvalds committed
891
892
893
module_init(init_idescsi_module);
module_exit(exit_idescsi_module);
MODULE_LICENSE("GPL");