ps3/block: Replace mtd/ps3vram by block/ps3vram

Convert the PS3 Video RAM Storage Driver from an MTD driver to a plain block
device driver.

The ps3vram driver exposes unused video RAM on the PS3 as a block device
suitable for storage or swap.  Fast data transfer is achieved using a local
cache in system RAM and DMA transfers via the GPU.

The new driver is ca. 50% faster for reading, and ca. 10% for writing.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 866 insertions, 0 deletions

diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 204332b29578..87e120e0a79c 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_MAC_FLOPPY)	+= swim3.o
 obj-$(CONFIG_BLK_DEV_FD)	+= floppy.o
 obj-$(CONFIG_AMIGA_FLOPPY)	+= amiflop.o
 obj-$(CONFIG_PS3_DISK)		+= ps3disk.o
+obj-$(CONFIG_PS3_VRAM)		+= ps3vram.o
 obj-$(CONFIG_ATARI_FLOPPY)	+= ataflop.o
 obj-$(CONFIG_AMIGA_Z2RAM)	+= z2ram.o
 obj-$(CONFIG_BLK_DEV_RAM)	+= brd.o
diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c
new file mode 100644
index 000000000000..393ed6760d78
--- /dev/null
+++ b/drivers/block/ps3vram.c
@@ -0,0 +1,865 @@
+/*
+ * ps3vram - Use extra PS3 video ram as MTD 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/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <asm/firmware.h>
+#include <asm/lv1call.h>
+#include <asm/ps3.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 L1GPU_CONTEXT_ATTRIBUTE_FB_BLIT 0x601
+
+#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 *ctrl;
+	u32 *reports;
+	u8 __iomem *ddr_base;
+	u8 *xdr_buf;
+
+	u32 *fifo_base;
+	u32 *fifo_ptr;
+
+	struct ps3vram_cache cache;
+
+	/* Used to serialize cache/DMA operations */
+	struct mutex lock;
+};
+
+
+static int ps3vram_major;
+
+
+static 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 *ps3vram_get_notifier(u32 *reports, int notifier)
+{
+	return (void *)reports + DMA_NOTIFIER_OFFSET_BASE +
+	       DMA_NOTIFIER_SIZE * notifier;
+}
+
+static void ps3vram_notifier_reset(struct ps3_system_bus_device *dev)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+	u32 *notify = ps3vram_get_notifier(priv->reports, NOTIFIER);
+	int i;
+
+	for (i = 0; i < 4; i++)
+		notify[i] = 0xffffffff;
+}
+
+static int ps3vram_notifier_wait(struct ps3_system_bus_device *dev,
+				 unsigned int timeout_ms)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+	u32 *notify = ps3vram_get_notifier(priv->reports, NOTIFIER);
+	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
+
+	do {
+		if (!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 = dev->core.driver_data;
+
+	priv->ctrl[CTRL_PUT] = FIFO_BASE + FIFO_OFFSET;
+	priv->ctrl[CTRL_GET] = FIFO_BASE + FIFO_OFFSET;
+}
+
+static int ps3vram_wait_ring(struct ps3_system_bus_device *dev,
+			     unsigned int timeout_ms)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
+
+	do {
+		if (priv->ctrl[CTRL_PUT] == priv->ctrl[CTRL_GET])
+			return 0;
+		msleep(1);
+	} while (time_before(jiffies, timeout));
+
+	dev_warn(&dev->core, "FIFO timeout (%08x/%08x/%08x)\n",
+		 priv->ctrl[CTRL_PUT], priv->ctrl[CTRL_GET],
+		 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 = dev->core.driver_data;
+	int status;
+
+	ps3vram_out_ring(priv, 0x20000000 | (FIFO_BASE + FIFO_OFFSET));
+
+	priv->ctrl[CTRL_PUT] = FIFO_BASE + FIFO_OFFSET;
+
+	/* asking the HV for a blit will kick the FIFO */
+	status = lv1_gpu_context_attribute(priv->context_handle,
+					   L1GPU_CONTEXT_ATTRIBUTE_FB_BLIT, 0,
+					   0, 0, 0);
+	if (status)
+		dev_err(&dev->core,
+			"%s: lv1_gpu_context_attribute 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 = dev->core.driver_data;
+	int status;
+
+	mutex_lock(&ps3_gpu_mutex);
+
+	priv->ctrl[CTRL_PUT] = FIFO_BASE + FIFO_OFFSET +
+			       (priv->fifo_ptr - priv->fifo_base) * sizeof(u32);
+
+	/* asking the HV for a blit will kick the FIFO */
+	status = lv1_gpu_context_attribute(priv->context_handle,
+					   L1GPU_CONTEXT_ATTRIBUTE_FB_BLIT, 0,
+					   0, 0, 0);
+	if (status)
+		dev_err(&dev->core,
+			"%s: lv1_gpu_context_attribute 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 = dev->core.driver_data;
+
+	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 = dev->core.driver_data;
+
+	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 = dev->core.driver_data;
+
+	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 = dev->core.driver_data;
+	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 = dev->core.driver_data;
+	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 = dev->core.driver_data;
+	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 = dev->core.driver_data;
+	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 = dev->core.driver_data;
+
+	priv->cache.page_count = CACHE_PAGE_COUNT;
+	priv->cache.page_size = CACHE_PAGE_SIZE;
+	priv->cache.tags = kzalloc(sizeof(struct ps3vram_tag) *
+				   CACHE_PAGE_COUNT, GFP_KERNEL);
+	if (priv->cache.tags == NULL) {
+		dev_err(&dev->core, "Could not allocate cache tags\n");
+		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 = dev->core.driver_data;
+
+	ps3vram_cache_flush(dev);
+	kfree(priv->cache.tags);
+}
+
+static int ps3vram_read(struct ps3_system_bus_device *dev, loff_t from,
+			size_t len, size_t *retlen, u_char *buf)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+	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 -EIO;
+
+	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;
+
+		mutex_lock(&priv->lock);
+
+		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);
+
+		mutex_unlock(&priv->lock);
+
+		buf += avail;
+		count -= avail;
+		from += avail;
+	}
+
+	*retlen = len;
+	return 0;
+}
+
+static int 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 = dev->core.driver_data;
+	unsigned int cached, count;
+
+	if (to >= priv->size)
+		return -EIO;
+
+	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;
+
+		mutex_lock(&priv->lock);
+
+		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;
+
+		mutex_unlock(&priv->lock);
+
+		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 int ps3vram_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ps3vram_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations ps3vram_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ps3vram_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static void __devinit ps3vram_proc_init(struct ps3_system_bus_device *dev)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+	struct proc_dir_entry *pde;
+
+	pde = proc_create(DEVICE_NAME, 0444, NULL, &ps3vram_proc_fops);
+	if (!pde) {
+		dev_warn(&dev->core, "failed to create /proc entry\n");
+		return;
+	}
+
+	pde->owner = THIS_MODULE;
+	pde->data = priv;
+}
+
+static int ps3vram_make_request(struct request_queue *q, struct bio *bio)
+{
+	struct ps3_system_bus_device *dev = q->queuedata;
+	int write = bio_data_dir(bio) == WRITE;
+	const char *op = write ? "write" : "read";
+	loff_t offset = bio->bi_sector << 9;
+	int error = 0;
+	struct bio_vec *bvec;
+	unsigned int i;
+
+	dev_dbg(&dev->core, "%s\n", __func__);
+
+	bio_for_each_segment(bvec, bio, i) {
+		/* 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);
+			goto out;
+		}
+
+		offset += len;
+	}
+
+	dev_dbg(&dev->core, "%s completed\n", op);
+
+out:
+	bio_endio(bio, error);
+	return 0;
+}
+
+static int __devinit ps3vram_probe(struct ps3_system_bus_device *dev)
+{
+	struct ps3vram_priv *priv;
+	int error, status;
+	struct request_queue *queue;
+	struct gendisk *gendisk;
+	u64 ddr_lpar, ctrl_lpar, info_lpar, reports_lpar, ddr_size,
+	    reports_size;
+	char *rest;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		error = -ENOMEM;
+		goto fail;
+	}
+
+	mutex_init(&priv->lock);
+	dev->core.driver_data = priv;
+
+	priv = dev->core.driver_data;
+
+	/* 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_close_gpu;
+	}
+
+	/* 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_free_xdr_buf;
+	}
+
+	/* 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 */
+	status = lv1_gpu_context_iomap(priv->context_handle, XDR_IOIF,
+				       ps3_mm_phys_to_lpar(__pa(priv->xdr_buf)),
+				       XDR_BUF_SIZE, 0);
+	if (status) {
+		dev_err(&dev->core, "lv1_gpu_context_iomap failed %d\n",
+			status);
+		error = -ENOMEM;
+		goto out_free_context;
+	}
+
+	priv->ddr_base = ioremap_flags(ddr_lpar, ddr_size, _PAGE_NO_CACHE);
+
+	if (!priv->ddr_base) {
+		dev_err(&dev->core, "ioremap DDR failed\n");
+		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_vram;
+	}
+
+	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;
+	}
+
+	ps3vram_cache_init(dev);
+	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_phys_segments(queue, MAX_PHYS_SEGMENTS);
+	blk_queue_max_hw_segments(queue, MAX_HW_SEGMENTS);
+	blk_queue_max_segment_size(queue, MAX_SEGMENT_SIZE);
+	blk_queue_max_sectors(queue, 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;
+	gendisk->driverfs_dev = &dev->core;
+	strlcpy(gendisk->disk_name, DEVICE_NAME, sizeof(gendisk->disk_name));
+	set_capacity(gendisk, priv->size >> 9);
+
+	dev_info(&dev->core, "%s: Using %lu MiB of GPU memory\n",
+		 gendisk->disk_name, get_capacity(gendisk) >> 11);
+
+	add_disk(gendisk);
+	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_vram:
+	iounmap(priv->ddr_base);
+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);
+	dev->core.driver_data = NULL;
+fail:
+	return error;
+}
+
+static int ps3vram_remove(struct ps3_system_bus_device *dev)
+{
+	struct ps3vram_priv *priv = dev->core.driver_data;
+
+	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);
+	iounmap(priv->ddr_base);
+	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);
+	dev->core.driver_data = 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);