ps3vram.c

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/*
 * 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 <[email protected]>
 * Added support RSX DMA Vivien Chappelier <[email protected]>
 */

#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 *ctrl;
    void *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 *ps3vram_get_notifier(void *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 *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 = ps3_system_bus_get_drvdata(dev);
    u32 *notify = ps3vram_get_notifier(priv->reports, NOTIFIER);
    unsigned long timeout;

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

    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 = ps3_system_bus_get_drvdata(dev);

    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 = ps3_system_bus_get_drvdata(dev);
    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 = ps3_system_bus_get_drvdata(dev);
    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_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);

    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_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 = 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 = ps3_system_bus_get_drvdata(dev);

    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 = 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 -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;

        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 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 = ps3_system_bus_get_drvdata(dev);
    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;

        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 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 = ps3_system_bus_get_drvdata(dev);
    struct proc_dir_entry *pde;

    pde = proc_create_data(DEVICE_NAME, 0444, NULL, &ps3vram_proc_fops,
                   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_sector << 9;
    int error = 0;
    struct bio_vec *bvec;
    unsigned int i;
    struct bio *next;

    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);
            error = -EIO;
            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_endio(bio, error);
    return next;
}

static void 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__);

    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;

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

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_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;
    }

    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_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;
    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_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);