summaryrefslogtreecommitdiff
path: root/drivers/block/ps3disk.c
blob: 4911f9e57bc70e11e782460bd9604721e4f80810 (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
/*
 * PS3 Disk Storage Driver
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2007 Sony Corp.
 *
 * 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; version 2 of the License.
 *
 * 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.
 *
 * 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 <linux/ata.h>
#include <linux/blkdev.h>
#include <linux/slab.h>

#include <asm/lv1call.h>
#include <asm/ps3stor.h>
#include <asm/firmware.h>


#define DEVICE_NAME		"ps3disk"

#define BOUNCE_SIZE		(64*1024)

#define PS3DISK_MAX_DISKS	16
#define PS3DISK_MINORS		16


#define PS3DISK_NAME		"ps3d%c"


struct ps3disk_private {
	spinlock_t lock;		/* Request queue spinlock */
	struct request_queue *queue;
	struct gendisk *gendisk;
	unsigned int blocking_factor;
	struct request *req;
	u64 raw_capacity;
	unsigned char model[ATA_ID_PROD_LEN+1];
};


#define LV1_STORAGE_SEND_ATA_COMMAND	(2)
#define LV1_STORAGE_ATA_HDDOUT		(0x23)

struct lv1_ata_cmnd_block {
	u16	features;
	u16	sector_count;
	u16	LBA_low;
	u16	LBA_mid;
	u16	LBA_high;
	u8	device;
	u8	command;
	u32	is_ext;
	u32	proto;
	u32	in_out;
	u32	size;
	u64	buffer;
	u32	arglen;
};

enum lv1_ata_proto {
	NON_DATA_PROTO     = 0,
	PIO_DATA_IN_PROTO  = 1,
	PIO_DATA_OUT_PROTO = 2,
	DMA_PROTO = 3
};

enum lv1_ata_in_out {
	DIR_WRITE = 0,			/* memory -> device */
	DIR_READ = 1			/* device -> memory */
};

static int ps3disk_major;


static const struct block_device_operations ps3disk_fops = {
	.owner		= THIS_MODULE,
};


static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
				   struct request *req, int gather)
{
	unsigned int offset = 0;
	struct req_iterator iter;
	struct bio_vec *bvec;
	unsigned int i = 0;
	size_t size;
	void *buf;

	rq_for_each_segment(bvec, req, iter) {
		unsigned long flags;
		dev_dbg(&dev->sbd.core,
			"%s:%u: bio %u: %u segs %u sectors from %lu\n",
			__func__, __LINE__, i, bio_segments(iter.bio),
			bio_sectors(iter.bio), iter.bio->bi_sector);

		size = bvec->bv_len;
		buf = bvec_kmap_irq(bvec, &flags);
		if (gather)
			memcpy(dev->bounce_buf+offset, buf, size);
		else
			memcpy(buf, dev->bounce_buf+offset, size);
		offset += size;
		flush_kernel_dcache_page(bvec->bv_page);
		bvec_kunmap_irq(bvec, &flags);
		i++;
	}
}

static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
				     struct request *req)
{
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	int write = rq_data_dir(req), res;
	const char *op = write ? "write" : "read";
	u64 start_sector, sectors;
	unsigned int region_id = dev->regions[dev->region_idx].id;

#ifdef DEBUG
	unsigned int n = 0;
	struct bio_vec *bv;
	struct req_iterator iter;

	rq_for_each_segment(bv, req, iter)
		n++;
	dev_dbg(&dev->sbd.core,
		"%s:%u: %s req has %u bvecs for %u sectors\n",
		__func__, __LINE__, op, n, blk_rq_sectors(req));
#endif

	start_sector = blk_rq_pos(req) * priv->blocking_factor;
	sectors = blk_rq_sectors(req) * priv->blocking_factor;
	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
		__func__, __LINE__, op, sectors, start_sector);

	if (write) {
		ps3disk_scatter_gather(dev, req, 1);

		res = lv1_storage_write(dev->sbd.dev_id, region_id,
					start_sector, sectors, 0,
					dev->bounce_lpar, &dev->tag);
	} else {
		res = lv1_storage_read(dev->sbd.dev_id, region_id,
				       start_sector, sectors, 0,
				       dev->bounce_lpar, &dev->tag);
	}
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
			__LINE__, op, res);
		__blk_end_request_all(req, -EIO);
		return 0;
	}

	priv->req = req;
	return 1;
}

static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
					struct request *req)
{
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);

	res = lv1_storage_send_device_command(dev->sbd.dev_id,
					      LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
					      0, &dev->tag);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
			__func__, __LINE__, res);
		__blk_end_request_all(req, -EIO);
		return 0;
	}

	priv->req = req;
	return 1;
}

static void ps3disk_do_request(struct ps3_storage_device *dev,
			       struct request_queue *q)
{
	struct request *req;

	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);

	while ((req = blk_fetch_request(q))) {
		if (req->cmd_flags & REQ_FLUSH) {
			if (ps3disk_submit_flush_request(dev, req))
				break;
		} else if (req->cmd_type == REQ_TYPE_FS) {
			if (ps3disk_submit_request_sg(dev, req))
				break;
		} else {
			blk_dump_rq_flags(req, DEVICE_NAME " bad request");
			__blk_end_request_all(req, -EIO);
			continue;
		}
	}
}

static void ps3disk_request(struct request_queue *q)
{
	struct ps3_storage_device *dev = q->queuedata;
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

	if (priv->req) {
		dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
		return;
	}

	ps3disk_do_request(dev, q);
}

static irqreturn_t ps3disk_interrupt(int irq, void *data)
{
	struct ps3_storage_device *dev = data;
	struct ps3disk_private *priv;
	struct request *req;
	int res, read, error;
	u64 tag, status;
	const char *op;

	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);

	if (tag != dev->tag)
		dev_err(&dev->sbd.core,
			"%s:%u: tag mismatch, got %llx, expected %llx\n",
			__func__, __LINE__, tag, dev->tag);

	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
			__func__, __LINE__, res, status);
		return IRQ_HANDLED;
	}

	priv = ps3_system_bus_get_drvdata(&dev->sbd);
	req = priv->req;
	if (!req) {
		dev_dbg(&dev->sbd.core,
			"%s:%u non-block layer request completed\n", __func__,
			__LINE__);
		dev->lv1_status = status;
		complete(&dev->done);
		return IRQ_HANDLED;
	}

	if (req->cmd_flags & REQ_FLUSH) {
		read = 0;
		op = "flush";
	} else {
		read = !rq_data_dir(req);
		op = read ? "read" : "write";
	}
	if (status) {
		dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
			__LINE__, op, status);
		error = -EIO;
	} else {
		dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
			__LINE__, op);
		error = 0;
		if (read)
			ps3disk_scatter_gather(dev, req, 0);
	}

	spin_lock(&priv->lock);
	__blk_end_request_all(req, error);
	priv->req = NULL;
	ps3disk_do_request(dev, priv->queue);
	spin_unlock(&priv->lock);

	return IRQ_HANDLED;
}

static int ps3disk_sync_cache(struct ps3_storage_device *dev)
{
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);

	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
			__func__, __LINE__, res);
		return -EIO;
	}
	return 0;
}


/* ATA helpers copied from drivers/ata/libata-core.c */

static void swap_buf_le16(u16 *buf, unsigned int buf_words)
{
#ifdef __BIG_ENDIAN
	unsigned int i;

	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
}

static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
			  unsigned int len)
{
	unsigned int c;

	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

		c = id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}
}

static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
			    unsigned int len)
{
	unsigned char *p;

	WARN_ON(!(len & 1));

	ata_id_string(id, s, ofs, len - 1);

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}

static int ps3disk_identify(struct ps3_storage_device *dev)
{
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	struct lv1_ata_cmnd_block ata_cmnd;
	u16 *id = dev->bounce_buf;
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);

	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	ata_cmnd.command = ATA_CMD_ID_ATA;
	ata_cmnd.sector_count = 1;
	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	ata_cmnd.buffer = dev->bounce_lpar;
	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	ata_cmnd.in_out = DIR_READ;

	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
				   ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
				   sizeof(ata_cmnd), ata_cmnd.buffer,
				   ata_cmnd.arglen);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
			__func__, __LINE__, res);
		return -EIO;
	}

	swap_buf_le16(id, ATA_ID_WORDS);

	/* All we're interested in are raw capacity and model name */
	priv->raw_capacity = ata_id_n_sectors(id);
	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	return 0;
}

static unsigned long ps3disk_mask;

static DEFINE_MUTEX(ps3disk_mask_mutex);

static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3disk_private *priv;
	int error;
	unsigned int devidx;
	struct request_queue *queue;
	struct gendisk *gendisk;

	if (dev->blk_size < 512) {
		dev_err(&dev->sbd.core,
			"%s:%u: cannot handle block size %llu\n", __func__,
			__LINE__, dev->blk_size);
		return -EINVAL;
	}

	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	mutex_lock(&ps3disk_mask_mutex);
	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	if (devidx >= PS3DISK_MAX_DISKS) {
		dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
			__LINE__);
		mutex_unlock(&ps3disk_mask_mutex);
		return -ENOSPC;
	}
	__set_bit(devidx, &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		error = -ENOMEM;
		goto fail;
	}

	ps3_system_bus_set_drvdata(_dev, priv);
	spin_lock_init(&priv->lock);

	dev->bounce_size = BOUNCE_SIZE;
	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	if (!dev->bounce_buf) {
		error = -ENOMEM;
		goto fail_free_priv;
	}

	error = ps3stor_setup(dev, ps3disk_interrupt);
	if (error)
		goto fail_free_bounce;

	ps3disk_identify(dev);

	queue = blk_init_queue(ps3disk_request, &priv->lock);
	if (!queue) {
		dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
			__func__, __LINE__);
		error = -ENOMEM;
		goto fail_teardown;
	}

	priv->queue = queue;
	queue->queuedata = dev;

	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);

	blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
	blk_queue_segment_boundary(queue, -1UL);
	blk_queue_dma_alignment(queue, dev->blk_size-1);
	blk_queue_logical_block_size(queue, dev->blk_size);

	blk_queue_flush(queue, REQ_FLUSH);

	blk_queue_max_segments(queue, -1);
	blk_queue_max_segment_size(queue, dev->bounce_size);

	gendisk = alloc_disk(PS3DISK_MINORS);
	if (!gendisk) {
		dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
			__LINE__);
		error = -ENOMEM;
		goto fail_cleanup_queue;
	}

	priv->gendisk = gendisk;
	gendisk->major = ps3disk_major;
	gendisk->first_minor = devidx * PS3DISK_MINORS;
	gendisk->fops = &ps3disk_fops;
	gendisk->queue = queue;
	gendisk->private_data = dev;
	gendisk->driverfs_dev = &dev->sbd.core;
	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
		 devidx+'a');
	priv->blocking_factor = dev->blk_size >> 9;
	set_capacity(gendisk,
		     dev->regions[dev->region_idx].size*priv->blocking_factor);

	dev_info(&dev->sbd.core,
		 "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
		 gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
		 get_capacity(gendisk) >> 11);

	add_disk(gendisk);
	return 0;

fail_cleanup_queue:
	blk_cleanup_queue(queue);
fail_teardown:
	ps3stor_teardown(dev);
fail_free_bounce:
	kfree(dev->bounce_buf);
fail_free_priv:
	kfree(priv);
	ps3_system_bus_set_drvdata(_dev, NULL);
fail:
	mutex_lock(&ps3disk_mask_mutex);
	__clear_bit(devidx, &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);
	return error;
}

static int ps3disk_remove(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

	mutex_lock(&ps3disk_mask_mutex);
	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
		    &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);
	del_gendisk(priv->gendisk);
	blk_cleanup_queue(priv->queue);
	put_disk(priv->gendisk);
	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	ps3disk_sync_cache(dev);
	ps3stor_teardown(dev);
	kfree(dev->bounce_buf);
	kfree(priv);
	ps3_system_bus_set_drvdata(_dev, NULL);
	return 0;
}

static struct ps3_system_bus_driver ps3disk = {
	.match_id	= PS3_MATCH_ID_STOR_DISK,
	.core.name	= DEVICE_NAME,
	.core.owner	= THIS_MODULE,
	.probe		= ps3disk_probe,
	.remove		= ps3disk_remove,
	.shutdown	= ps3disk_remove,
};


static int __init ps3disk_init(void)
{
	int error;

	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
		return -ENODEV;

	error = register_blkdev(0, DEVICE_NAME);
	if (error <= 0) {
		printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
		       __LINE__, error);
		return error;
	}
	ps3disk_major = error;

	pr_info("%s:%u: registered block device major %d\n", __func__,
		__LINE__, ps3disk_major);

	error = ps3_system_bus_driver_register(&ps3disk);
	if (error)
		unregister_blkdev(ps3disk_major, DEVICE_NAME);

	return error;
}

static void __exit ps3disk_exit(void)
{
	ps3_system_bus_driver_unregister(&ps3disk);
	unregister_blkdev(ps3disk_major, DEVICE_NAME);
}

module_init(ps3disk_init);
module_exit(ps3disk_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 Disk Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);