summaryrefslogtreecommitdiffstats
path: root/drivers/block/ps3vram.c
blob: 4628e1a27a2b7133254f8e6629d5360cd1628319 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * ps3vram - Use extra PS3 video ram as block device.
 *
 * Copyright 2009 Sony Corporation
 *
 * Based on the MTD ps3vram driver, which is
 * Copyright (c) 2007-2008 Jim Paris <jim@jtan.com>
 * Added support RSX DMA Vivien Chappelier <vivien.chappelier@free.fr>
 */

#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#include <asm/cell-regs.h>
#include <asm/firmware.h>
#include <asm/lv1call.h>
#include <asm/ps3.h>
#include <asm/ps3gpu.h>


#define DEVICE_NAME		"ps3vram"


#define XDR_BUF_SIZE (2 * 1024 * 1024) /* XDR buffer (must be 1MiB aligned) */
#define XDR_IOIF 0x0c000000

#define FIFO_BASE XDR_IOIF
#define FIFO_SIZE (64 * 1024)

#define DMA_PAGE_SIZE (4 * 1024)

#define CACHE_PAGE_SIZE (256 * 1024)
#define CACHE_PAGE_COUNT ((XDR_BUF_SIZE - FIFO_SIZE) / CACHE_PAGE_SIZE)

#define CACHE_OFFSET CACHE_PAGE_SIZE
#define FIFO_OFFSET 0

#define CTRL_PUT 0x10
#define CTRL_GET 0x11
#define CTRL_TOP 0x15

#define UPLOAD_SUBCH	1
#define DOWNLOAD_SUBCH	2

#define NV_MEMORY_TO_MEMORY_FORMAT_OFFSET_IN	0x0000030c
#define NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY	0x00000104

#define CACHE_PAGE_PRESENT 1
#define CACHE_PAGE_DIRTY   2

struct ps3vram_tag {
	unsigned int address;
	unsigned int flags;
};

struct ps3vram_cache {
	unsigned int page_count;
	unsigned int page_size;
	struct ps3vram_tag *tags;
	unsigned int hit;
	unsigned int miss;
};

struct ps3vram_priv {
	struct request_queue *queue;
	struct gendisk *gendisk;

	u64 size;

	u64 memory_handle;
	u64 context_handle;
	u32 __iomem *ctrl;
	void __iomem *reports;
	u8 *xdr_buf;

	u32 *fifo_base;
	u32 *fifo_ptr;

	struct ps3vram_cache cache;

	spinlock_t lock;	/* protecting list of bios */
	struct bio_list list;
};


static int ps3vram_major;


static const struct block_device_operations ps3vram_fops = {
	.owner		= THIS_MODULE,
};


#define DMA_NOTIFIER_HANDLE_BASE 0x66604200 /* first DMA notifier handle */
#define DMA_NOTIFIER_OFFSET_BASE 0x1000     /* first DMA notifier offset */
#define DMA_NOTIFIER_SIZE        0x40
#define NOTIFIER 7	/* notifier used for completion report */

static char *size = "256M";
module_param(size, charp, 0);
MODULE_PARM_DESC(size, "memory size");

static u32 __iomem *ps3vram_get_notifier(void __iomem *reports, int notifier)
{
	return reports + DMA_NOTIFIER_OFFSET_BASE +
	       DMA_NOTIFIER_SIZE * notifier;
}

static void ps3vram_notifier_reset(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	u32 __iomem *notify = ps3vram_get_notifier(priv->reports, NOTIFIER);
	int i;

	for (i = 0; i < 4; i++)
		iowrite32be(0xffffffff, notify + i);
}

static int ps3vram_notifier_wait(struct ps3_system_bus_device *dev,
				 unsigned int timeout_ms)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	u32 __iomem *notify = ps3vram_get_notifier(priv->reports, NOTIFIER);
	unsigned long timeout;

	for (timeout = 20; timeout; timeout--) {
		if (!ioread32be(notify + 3))
			return 0;
		udelay(10);
	}

	timeout = jiffies + msecs_to_jiffies(timeout_ms);

	do {
		if (!ioread32be(notify + 3))
			return 0;
		msleep(1);
	} while (time_before(jiffies, timeout));

	return -ETIMEDOUT;
}

static void ps3vram_init_ring(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	iowrite32be(FIFO_BASE + FIFO_OFFSET, priv->ctrl + CTRL_PUT);
	iowrite32be(FIFO_BASE + FIFO_OFFSET, priv->ctrl + CTRL_GET);
}

static int ps3vram_wait_ring(struct ps3_system_bus_device *dev,
			     unsigned int timeout_ms)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

	do {
		if (ioread32be(priv->ctrl + CTRL_PUT) == ioread32be(priv->ctrl + CTRL_GET))
			return 0;
		msleep(1);
	} while (time_before(jiffies, timeout));

	dev_warn(&dev->core, "FIFO timeout (%08x/%08x/%08x)\n",
		 ioread32be(priv->ctrl + CTRL_PUT), ioread32be(priv->ctrl + CTRL_GET),
		 ioread32be(priv->ctrl + CTRL_TOP));

	return -ETIMEDOUT;
}

static void ps3vram_out_ring(struct ps3vram_priv *priv, u32 data)
{
	*(priv->fifo_ptr)++ = data;
}

static void ps3vram_begin_ring(struct ps3vram_priv *priv, u32 chan, u32 tag,
			       u32 size)
{
	ps3vram_out_ring(priv, (size << 18) | (chan << 13) | tag);
}

static void ps3vram_rewind_ring(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	int status;

	ps3vram_out_ring(priv, 0x20000000 | (FIFO_BASE + FIFO_OFFSET));

	iowrite32be(FIFO_BASE + FIFO_OFFSET, priv->ctrl + CTRL_PUT);

	/* asking the HV for a blit will kick the FIFO */
	status = lv1_gpu_fb_blit(priv->context_handle, 0, 0, 0, 0);
	if (status)
		dev_err(&dev->core, "%s: lv1_gpu_fb_blit failed %d\n",
			__func__, status);

	priv->fifo_ptr = priv->fifo_base;
}

static void ps3vram_fire_ring(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	int status;

	mutex_lock(&ps3_gpu_mutex);

	iowrite32be(FIFO_BASE + FIFO_OFFSET + (priv->fifo_ptr - priv->fifo_base)
		* sizeof(u32), priv->ctrl + CTRL_PUT);

	/* asking the HV for a blit will kick the FIFO */
	status = lv1_gpu_fb_blit(priv->context_handle, 0, 0, 0, 0);
	if (status)
		dev_err(&dev->core, "%s: lv1_gpu_fb_blit failed %d\n",
			__func__, status);

	if ((priv->fifo_ptr - priv->fifo_base) * sizeof(u32) >
	    FIFO_SIZE - 1024) {
		dev_dbg(&dev->core, "FIFO full, rewinding\n");
		ps3vram_wait_ring(dev, 200);
		ps3vram_rewind_ring(dev);
	}

	mutex_unlock(&ps3_gpu_mutex);
}

static void ps3vram_bind(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	ps3vram_begin_ring(priv, UPLOAD_SUBCH, 0, 1);
	ps3vram_out_ring(priv, 0x31337303);
	ps3vram_begin_ring(priv, UPLOAD_SUBCH, 0x180, 3);
	ps3vram_out_ring(priv, DMA_NOTIFIER_HANDLE_BASE + NOTIFIER);
	ps3vram_out_ring(priv, 0xfeed0001);	/* DMA system RAM instance */
	ps3vram_out_ring(priv, 0xfeed0000);     /* DMA video RAM instance */

	ps3vram_begin_ring(priv, DOWNLOAD_SUBCH, 0, 1);
	ps3vram_out_ring(priv, 0x3137c0de);
	ps3vram_begin_ring(priv, DOWNLOAD_SUBCH, 0x180, 3);
	ps3vram_out_ring(priv, DMA_NOTIFIER_HANDLE_BASE + NOTIFIER);
	ps3vram_out_ring(priv, 0xfeed0000);	/* DMA video RAM instance */
	ps3vram_out_ring(priv, 0xfeed0001);	/* DMA system RAM instance */

	ps3vram_fire_ring(dev);
}

static int ps3vram_upload(struct ps3_system_bus_device *dev,
			  unsigned int src_offset, unsigned int dst_offset,
			  int len, int count)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	ps3vram_begin_ring(priv, UPLOAD_SUBCH,
			   NV_MEMORY_TO_MEMORY_FORMAT_OFFSET_IN, 8);
	ps3vram_out_ring(priv, XDR_IOIF + src_offset);
	ps3vram_out_ring(priv, dst_offset);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, count);
	ps3vram_out_ring(priv, (1 << 8) | 1);
	ps3vram_out_ring(priv, 0);

	ps3vram_notifier_reset(dev);
	ps3vram_begin_ring(priv, UPLOAD_SUBCH,
			   NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY, 1);
	ps3vram_out_ring(priv, 0);
	ps3vram_begin_ring(priv, UPLOAD_SUBCH, 0x100, 1);
	ps3vram_out_ring(priv, 0);
	ps3vram_fire_ring(dev);
	if (ps3vram_notifier_wait(dev, 200) < 0) {
		dev_warn(&dev->core, "%s: Notifier timeout\n", __func__);
		return -1;
	}

	return 0;
}

static int ps3vram_download(struct ps3_system_bus_device *dev,
			    unsigned int src_offset, unsigned int dst_offset,
			    int len, int count)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	ps3vram_begin_ring(priv, DOWNLOAD_SUBCH,
			   NV_MEMORY_TO_MEMORY_FORMAT_OFFSET_IN, 8);
	ps3vram_out_ring(priv, src_offset);
	ps3vram_out_ring(priv, XDR_IOIF + dst_offset);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, len);
	ps3vram_out_ring(priv, count);
	ps3vram_out_ring(priv, (1 << 8) | 1);
	ps3vram_out_ring(priv, 0);

	ps3vram_notifier_reset(dev);
	ps3vram_begin_ring(priv, DOWNLOAD_SUBCH,
			   NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY, 1);
	ps3vram_out_ring(priv, 0);
	ps3vram_begin_ring(priv, DOWNLOAD_SUBCH, 0x100, 1);
	ps3vram_out_ring(priv, 0);
	ps3vram_fire_ring(dev);
	if (ps3vram_notifier_wait(dev, 200) < 0) {
		dev_warn(&dev->core, "%s: Notifier timeout\n", __func__);
		return -1;
	}

	return 0;
}

static void ps3vram_cache_evict(struct ps3_system_bus_device *dev, int entry)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	struct ps3vram_cache *cache = &priv->cache;

	if (!(cache->tags[entry].flags & CACHE_PAGE_DIRTY))
		return;

	dev_dbg(&dev->core, "Flushing %d: 0x%08x\n", entry,
		cache->tags[entry].address);
	if (ps3vram_upload(dev, CACHE_OFFSET + entry * cache->page_size,
			   cache->tags[entry].address, DMA_PAGE_SIZE,
			   cache->page_size / DMA_PAGE_SIZE) < 0) {
		dev_err(&dev->core,
			"Failed to upload from 0x%x to " "0x%x size 0x%x\n",
			entry * cache->page_size, cache->tags[entry].address,
			cache->page_size);
	}
	cache->tags[entry].flags &= ~CACHE_PAGE_DIRTY;
}

static void ps3vram_cache_load(struct ps3_system_bus_device *dev, int entry,
			       unsigned int address)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	struct ps3vram_cache *cache = &priv->cache;

	dev_dbg(&dev->core, "Fetching %d: 0x%08x\n", entry, address);
	if (ps3vram_download(dev, address,
			     CACHE_OFFSET + entry * cache->page_size,
			     DMA_PAGE_SIZE,
			     cache->page_size / DMA_PAGE_SIZE) < 0) {
		dev_err(&dev->core,
			"Failed to download from 0x%x to 0x%x size 0x%x\n",
			address, entry * cache->page_size, cache->page_size);
	}

	cache->tags[entry].address = address;
	cache->tags[entry].flags |= CACHE_PAGE_PRESENT;
}


static void ps3vram_cache_flush(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	struct ps3vram_cache *cache = &priv->cache;
	int i;

	dev_dbg(&dev->core, "FLUSH\n");
	for (i = 0; i < cache->page_count; i++) {
		ps3vram_cache_evict(dev, i);
		cache->tags[i].flags = 0;
	}
}

static unsigned int ps3vram_cache_match(struct ps3_system_bus_device *dev,
					loff_t address)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	struct ps3vram_cache *cache = &priv->cache;
	unsigned int base;
	unsigned int offset;
	int i;
	static int counter;

	offset = (unsigned int) (address & (cache->page_size - 1));
	base = (unsigned int) (address - offset);

	/* fully associative check */
	for (i = 0; i < cache->page_count; i++) {
		if ((cache->tags[i].flags & CACHE_PAGE_PRESENT) &&
		    cache->tags[i].address == base) {
			cache->hit++;
			dev_dbg(&dev->core, "Found entry %d: 0x%08x\n", i,
				cache->tags[i].address);
			return i;
		}
	}

	/* choose a random entry */
	i = (jiffies + (counter++)) % cache->page_count;
	dev_dbg(&dev->core, "Using entry %d\n", i);

	ps3vram_cache_evict(dev, i);
	ps3vram_cache_load(dev, i, base);

	cache->miss++;
	return i;
}

static int ps3vram_cache_init(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	priv->cache.page_count = CACHE_PAGE_COUNT;
	priv->cache.page_size = CACHE_PAGE_SIZE;
	priv->cache.tags = kcalloc(CACHE_PAGE_COUNT,
				   sizeof(struct ps3vram_tag),
				   GFP_KERNEL);
	if (!priv->cache.tags)
		return -ENOMEM;

	dev_info(&dev->core, "Created ram cache: %d entries, %d KiB each\n",
		CACHE_PAGE_COUNT, CACHE_PAGE_SIZE / 1024);

	return 0;
}

static void ps3vram_cache_cleanup(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	ps3vram_cache_flush(dev);
	kfree(priv->cache.tags);
}

static blk_status_t ps3vram_read(struct ps3_system_bus_device *dev, loff_t from,
			size_t len, size_t *retlen, u_char *buf)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	unsigned int cached, count;

	dev_dbg(&dev->core, "%s: from=0x%08x len=0x%zx\n", __func__,
		(unsigned int)from, len);

	if (from >= priv->size)
		return BLK_STS_IOERR;

	if (len > priv->size - from)
		len = priv->size - from;

	/* Copy from vram to buf */
	count = len;
	while (count) {
		unsigned int offset, avail;
		unsigned int entry;

		offset = (unsigned int) (from & (priv->cache.page_size - 1));
		avail  = priv->cache.page_size - offset;

		entry = ps3vram_cache_match(dev, from);
		cached = CACHE_OFFSET + entry * priv->cache.page_size + offset;

		dev_dbg(&dev->core, "%s: from=%08x cached=%08x offset=%08x "
			"avail=%08x count=%08x\n", __func__,
			(unsigned int)from, cached, offset, avail, count);

		if (avail > count)
			avail = count;
		memcpy(buf, priv->xdr_buf + cached, avail);

		buf += avail;
		count -= avail;
		from += avail;
	}

	*retlen = len;
	return 0;
}

static blk_status_t ps3vram_write(struct ps3_system_bus_device *dev, loff_t to,
			 size_t len, size_t *retlen, const u_char *buf)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	unsigned int cached, count;

	if (to >= priv->size)
		return BLK_STS_IOERR;

	if (len > priv->size - to)
		len = priv->size - to;

	/* Copy from buf to vram */
	count = len;
	while (count) {
		unsigned int offset, avail;
		unsigned int entry;

		offset = (unsigned int) (to & (priv->cache.page_size - 1));
		avail  = priv->cache.page_size - offset;

		entry = ps3vram_cache_match(dev, to);
		cached = CACHE_OFFSET + entry * priv->cache.page_size + offset;

		dev_dbg(&dev->core, "%s: to=%08x cached=%08x offset=%08x "
			"avail=%08x count=%08x\n", __func__, (unsigned int)to,
			cached, offset, avail, count);

		if (avail > count)
			avail = count;
		memcpy(priv->xdr_buf + cached, buf, avail);

		priv->cache.tags[entry].flags |= CACHE_PAGE_DIRTY;

		buf += avail;
		count -= avail;
		to += avail;
	}

	*retlen = len;
	return 0;
}

static int ps3vram_proc_show(struct seq_file *m, void *v)
{
	struct ps3vram_priv *priv = m->private;

	seq_printf(m, "hit:%u\nmiss:%u\n", priv->cache.hit, priv->cache.miss);
	return 0;
}

static void ps3vram_proc_init(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	struct proc_dir_entry *pde;

	pde = proc_create_single_data(DEVICE_NAME, 0444, NULL,
			ps3vram_proc_show, priv);
	if (!pde)
		dev_warn(&dev->core, "failed to create /proc entry\n");
}

static struct bio *ps3vram_do_bio(struct ps3_system_bus_device *dev,
				  struct bio *bio)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	int write = bio_data_dir(bio) == WRITE;
	const char *op = write ? "write" : "read";
	loff_t offset = bio->bi_iter.bi_sector << 9;
	blk_status_t error = 0;
	struct bio_vec bvec;
	struct bvec_iter iter;
	struct bio *next;

	bio_for_each_segment(bvec, bio, iter) {
		/* PS3 is ppc64, so we don't handle highmem */
		char *ptr = page_address(bvec.bv_page) + bvec.bv_offset;
		size_t len = bvec.bv_len, retlen;

		dev_dbg(&dev->core, "    %s %zu bytes at offset %llu\n", op,
			len, offset);
		if (write)
			error = ps3vram_write(dev, offset, len, &retlen, ptr);
		else
			error = ps3vram_read(dev, offset, len, &retlen, ptr);

		if (error) {
			dev_err(&dev->core, "%s failed\n", op);
			goto out;
		}

		if (retlen != len) {
			dev_err(&dev->core, "Short %s\n", op);
			error = BLK_STS_IOERR;
			goto out;
		}

		offset += len;
	}

	dev_dbg(&dev->core, "%s completed\n", op);

out:
	spin_lock_irq(&priv->lock);
	bio_list_pop(&priv->list);
	next = bio_list_peek(&priv->list);
	spin_unlock_irq(&priv->lock);

	bio->bi_status = error;
	bio_endio(bio);
	return next;
}

static blk_qc_t ps3vram_make_request(struct request_queue *q, struct bio *bio)
{
	struct ps3_system_bus_device *dev = q->queuedata;
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
	int busy;

	dev_dbg(&dev->core, "%s\n", __func__);

	blk_queue_split(q, &bio);

	spin_lock_irq(&priv->lock);
	busy = !bio_list_empty(&priv->list);
	bio_list_add(&priv->list, bio);
	spin_unlock_irq(&priv->lock);

	if (busy)
		return BLK_QC_T_NONE;

	do {
		bio = ps3vram_do_bio(dev, bio);
	} while (bio);

	return BLK_QC_T_NONE;
}

static int ps3vram_probe(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv;
	int error, status;
	struct request_queue *queue;
	struct gendisk *gendisk;
	u64 ddr_size, ddr_lpar, ctrl_lpar, info_lpar, reports_lpar,
	    reports_size, xdr_lpar;
	char *rest;

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

	spin_lock_init(&priv->lock);
	bio_list_init(&priv->list);
	ps3_system_bus_set_drvdata(dev, priv);

	/* Allocate XDR buffer (1MiB aligned) */
	priv->xdr_buf = (void *)__get_free_pages(GFP_KERNEL,
		get_order(XDR_BUF_SIZE));
	if (priv->xdr_buf == NULL) {
		dev_err(&dev->core, "Could not allocate XDR buffer\n");
		error = -ENOMEM;
		goto fail_free_priv;
	}

	/* Put FIFO at begginning of XDR buffer */
	priv->fifo_base = (u32 *) (priv->xdr_buf + FIFO_OFFSET);
	priv->fifo_ptr = priv->fifo_base;

	/* XXX: Need to open GPU, in case ps3fb or snd_ps3 aren't loaded */
	if (ps3_open_hv_device(dev)) {
		dev_err(&dev->core, "ps3_open_hv_device failed\n");
		error = -EAGAIN;
		goto out_free_xdr_buf;
	}

	/* Request memory */
	status = -1;
	ddr_size = ALIGN(memparse(size, &rest), 1024*1024);
	if (!ddr_size) {
		dev_err(&dev->core, "Specified size is too small\n");
		error = -EINVAL;
		goto out_close_gpu;
	}

	while (ddr_size > 0) {
		status = lv1_gpu_memory_allocate(ddr_size, 0, 0, 0, 0,
						 &priv->memory_handle,
						 &ddr_lpar);
		if (!status)
			break;
		ddr_size -= 1024*1024;
	}
	if (status) {
		dev_err(&dev->core, "lv1_gpu_memory_allocate failed %d\n",
			status);
		error = -ENOMEM;
		goto out_close_gpu;
	}

	/* Request context */
	status = lv1_gpu_context_allocate(priv->memory_handle, 0,
					  &priv->context_handle, &ctrl_lpar,
					  &info_lpar, &reports_lpar,
					  &reports_size);
	if (status) {
		dev_err(&dev->core, "lv1_gpu_context_allocate failed %d\n",
			status);
		error = -ENOMEM;
		goto out_free_memory;
	}

	/* Map XDR buffer to RSX */
	xdr_lpar = ps3_mm_phys_to_lpar(__pa(priv->xdr_buf));
	status = lv1_gpu_context_iomap(priv->context_handle, XDR_IOIF,
				       xdr_lpar, XDR_BUF_SIZE,
				       CBE_IOPTE_PP_W | CBE_IOPTE_PP_R |
				       CBE_IOPTE_M);
	if (status) {
		dev_err(&dev->core, "lv1_gpu_context_iomap failed %d\n",
			status);
		error = -ENOMEM;
		goto out_free_context;
	}

	priv->ctrl = ioremap(ctrl_lpar, 64 * 1024);
	if (!priv->ctrl) {
		dev_err(&dev->core, "ioremap CTRL failed\n");
		error = -ENOMEM;
		goto out_unmap_context;
	}

	priv->reports = ioremap(reports_lpar, reports_size);
	if (!priv->reports) {
		dev_err(&dev->core, "ioremap REPORTS failed\n");
		error = -ENOMEM;
		goto out_unmap_ctrl;
	}

	mutex_lock(&ps3_gpu_mutex);
	ps3vram_init_ring(dev);
	mutex_unlock(&ps3_gpu_mutex);

	priv->size = ddr_size;

	ps3vram_bind(dev);

	mutex_lock(&ps3_gpu_mutex);
	error = ps3vram_wait_ring(dev, 100);
	mutex_unlock(&ps3_gpu_mutex);
	if (error < 0) {
		dev_err(&dev->core, "Failed to initialize channels\n");
		error = -ETIMEDOUT;
		goto out_unmap_reports;
	}

	error = ps3vram_cache_init(dev);
	if (error < 0) {
		goto out_unmap_reports;
	}

	ps3vram_proc_init(dev);

	queue = blk_alloc_queue(GFP_KERNEL);
	if (!queue) {
		dev_err(&dev->core, "blk_alloc_queue failed\n");
		error = -ENOMEM;
		goto out_cache_cleanup;
	}

	priv->queue = queue;
	queue->queuedata = dev;
	blk_queue_make_request(queue, ps3vram_make_request);
	blk_queue_max_segments(queue, BLK_MAX_SEGMENTS);
	blk_queue_max_segment_size(queue, BLK_MAX_SEGMENT_SIZE);
	blk_queue_max_hw_sectors(queue, BLK_SAFE_MAX_SECTORS);

	gendisk = alloc_disk(1);
	if (!gendisk) {
		dev_err(&dev->core, "alloc_disk failed\n");
		error = -ENOMEM;
		goto fail_cleanup_queue;
	}

	priv->gendisk = gendisk;
	gendisk->major = ps3vram_major;
	gendisk->first_minor = 0;
	gendisk->fops = &ps3vram_fops;
	gendisk->queue = queue;
	gendisk->private_data = dev;
	strlcpy(gendisk->disk_name, DEVICE_NAME, sizeof(gendisk->disk_name));
	set_capacity(gendisk, priv->size >> 9);

	dev_info(&dev->core, "%s: Using %llu MiB of GPU memory\n",
		 gendisk->disk_name, get_capacity(gendisk) >> 11);

	device_add_disk(&dev->core, gendisk, NULL);
	return 0;

fail_cleanup_queue:
	blk_cleanup_queue(queue);
out_cache_cleanup:
	remove_proc_entry(DEVICE_NAME, NULL);
	ps3vram_cache_cleanup(dev);
out_unmap_reports:
	iounmap(priv->reports);
out_unmap_ctrl:
	iounmap(priv->ctrl);
out_unmap_context:
	lv1_gpu_context_iomap(priv->context_handle, XDR_IOIF, xdr_lpar,
			      XDR_BUF_SIZE, CBE_IOPTE_M);
out_free_context:
	lv1_gpu_context_free(priv->context_handle);
out_free_memory:
	lv1_gpu_memory_free(priv->memory_handle);
out_close_gpu:
	ps3_close_hv_device(dev);
out_free_xdr_buf:
	free_pages((unsigned long) priv->xdr_buf, get_order(XDR_BUF_SIZE));
fail_free_priv:
	kfree(priv);
	ps3_system_bus_set_drvdata(dev, NULL);
fail:
	return error;
}

static int ps3vram_remove(struct ps3_system_bus_device *dev)
{
	struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);

	del_gendisk(priv->gendisk);
	put_disk(priv->gendisk);
	blk_cleanup_queue(priv->queue);
	remove_proc_entry(DEVICE_NAME, NULL);
	ps3vram_cache_cleanup(dev);
	iounmap(priv->reports);
	iounmap(priv->ctrl);
	lv1_gpu_context_iomap(priv->context_handle, XDR_IOIF,
			      ps3_mm_phys_to_lpar(__pa(priv->xdr_buf)),
			      XDR_BUF_SIZE, CBE_IOPTE_M);
	lv1_gpu_context_free(priv->context_handle);
	lv1_gpu_memory_free(priv->memory_handle);
	ps3_close_hv_device(dev);
	free_pages((unsigned long) priv->xdr_buf, get_order(XDR_BUF_SIZE));
	kfree(priv);
	ps3_system_bus_set_drvdata(dev, NULL);
	return 0;
}

static struct ps3_system_bus_driver ps3vram = {
	.match_id	= PS3_MATCH_ID_GPU,
	.match_sub_id	= PS3_MATCH_SUB_ID_GPU_RAMDISK,
	.core.name	= DEVICE_NAME,
	.core.owner	= THIS_MODULE,
	.probe		= ps3vram_probe,
	.remove		= ps3vram_remove,
	.shutdown	= ps3vram_remove,
};


static int __init ps3vram_init(void)
{
	int error;

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

	error = register_blkdev(0, DEVICE_NAME);
	if (error <= 0) {
		pr_err("%s: register_blkdev failed %d\n", DEVICE_NAME, error);
		return error;
	}
	ps3vram_major = error;

	pr_info("%s: registered block device major %d\n", DEVICE_NAME,
		ps3vram_major);

	error = ps3_system_bus_driver_register(&ps3vram);
	if (error)
		unregister_blkdev(ps3vram_major, DEVICE_NAME);

	return error;
}

static void __exit ps3vram_exit(void)
{
	ps3_system_bus_driver_unregister(&ps3vram);
	unregister_blkdev(ps3vram_major, DEVICE_NAME);
}

module_init(ps3vram_init);
module_exit(ps3vram_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 Video RAM Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_GPU_RAMDISK);