[PATCH/RFC] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device
Benjamin Herrenschmidt
benh at kernel.crashing.org
Thu Mar 5 10:27:35 EST 2009
On Wed, 2009-03-04 at 14:57 +0100, Geert Uytterhoeven wrote:
> Hi,
>
> Below is the rewrite of the PS3 Video RAM Storage Driver as a plain block
> device, as requested by Arnd Bergmann.
>
> The MTD-based PS3 Video RAM Storage Driver was integrated into the mainline
> kernel in 2.6.29-rc1.
>
> Ideally, we think it would be best if the existing MTD-based ps3vram driver
> would be replaced by the new block-based ps3vram driver before 2.6.29 is
> released. This would relieve the burden of supporting two different swap space
> schemes on PS3 (swap on /dev/mtdblock0 vs. /dev/ps3vram) from the distro
> maintainer's shoulders, as in that case there would never have been a stable
> kernel version containing the MTD-based ps3vram driver.
This is very very very late ... we are at rc7, probably one rc before
final... as much as I like integrating drivers later, I'll ask Linus
opinion on this one.
Linus ? What do you reckon ? Maybe a better option is just to remove
ps3nvram from .29 and merge the new one in .30 ?
Cheers,
Ben.
> What do you think? If this is accepted, I'll submit a patch to remove the MTD
> ps3vram and add the new driver as ps3vram (instead of ps3vram-ng).
>
> Thanks for your (review and other) comments!
>
> ---
> >From e19ce619675bc150cd82701e7b272f7018c36527 Mon Sep 17 00:00:00 2001
> From: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>
> Date: Wed, 25 Feb 2009 18:32:10 +0100
> Subject: [PATCH] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device
>
> Add ps3vram-ng driver, which 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.
>
> Notes:
> - As both the existing MTD ps3vram and ps3vram-ng bind to the same PS3 system
> bus device, the driver which is loaded first by udev wins. However, you can
> unload ps3vram, and load ps3vram-ng later.
> - ps3vram-ng is faster than ps3vram:
> o 1 MiB blocks: +50% (read), +5% (write)
> o 4 KiB blocks: +50% (read), +5% (write)
> o 512 B blocks: +10% (read), +10% (write)
>
> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>
> Cc: Jim Paris <jim at jtan.com>
> Cc: Vivien Chappelier <vivien.chappelier at free.fr>
> ---
> arch/powerpc/platforms/ps3/Kconfig | 7 +
> drivers/block/Makefile | 1 +
> drivers/block/ps3vram_ng.c | 916 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 924 insertions(+), 0 deletions(-)
> create mode 100644 drivers/block/ps3vram_ng.c
>
> diff --git a/arch/powerpc/platforms/ps3/Kconfig b/arch/powerpc/platforms/ps3/Kconfig
> index 920cf7a..b3b7a20 100644
> --- a/arch/powerpc/platforms/ps3/Kconfig
> +++ b/arch/powerpc/platforms/ps3/Kconfig
> @@ -128,6 +128,13 @@ config PS3_FLASH
> be disabled on the kernel command line using "ps3flash=off", to
> not allocate this fixed buffer.
>
> +config PS3_VRAM
> + tristate "PS3 Video RAM Storage Driver"
> + depends on PPC_PS3 && BLOCK
> + help
> + This driver allows you to use excess PS3 video RAM as volatile
> + storage or system swap.
> +
> config PS3_LPM
> tristate "PS3 Logical Performance Monitor support"
> depends on PPC_PS3
> diff --git a/drivers/block/Makefile b/drivers/block/Makefile
> index 204332b..ad3e45e 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-$(CONFIG_PS3_VRAM) += ps3vram_ng.o
> obj-$(CONFIG_ATARI_FLOPPY) += ataflop.o
> obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o
> obj-$(CONFIG_BLK_DEV_RAM) += brd.o
> diff --git a/drivers/block/ps3vram_ng.c b/drivers/block/ps3vram_ng.c
> new file mode 100644
> index 0000000..fa24a17
> --- /dev/null
> +++ b/drivers/block/ps3vram_ng.c
> @@ -0,0 +1,916 @@
> +/*
> + * 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 at jtan.com>
> + * Added support RSX DMA Vivien Chappelier <vivien.chappelier at free.fr>
> + */
> +
> +#include <linux/blkdev.h>
> +#include <linux/delay.h>
> +#include <linux/kthread.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 {
> + spinlock_t lock; /* Request queue spinlock */
> + struct task_struct *thread;
> + 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;
> +};
> +
> +
> +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 */
> +
> +/* A trailing '-' means to subtract off ps3fb_videomemory.size */
> +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_dbg(&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;
> + u64 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 %llu\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;
> + u64 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 %llu\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_dbg(&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_dbg(&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 -EINVAL;
> +
> + 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 = dev->core.driver_data;
> + unsigned int cached, count;
> +
> + if (to >= priv->size)
> + return -EINVAL;
> +
> + 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 = 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 void ps3vram_do_request(struct ps3_system_bus_device *dev,
> + struct request *req)
> +{
> + struct ps3vram_priv *priv = dev->core.driver_data;
> + int write, res, uptodate = 0;
> + const char *op;
> + sector_t start_sector;
> + unsigned int sectors;
> + loff_t offset;
> + size_t len, retlen;
> +
> + write = rq_data_dir(req);
> + op = write ? "write" : "read";
> +
> + start_sector = req->sector;
> + sectors = req->current_nr_sectors;
> + dev_dbg(&dev->core, "%s %u sectors starting at %lu\n", op, sectors,
> + start_sector);
> +
> + offset = start_sector << 9;
> + len = sectors << 9;
> +
> + if (write)
> + res = ps3vram_write(dev, offset, len, &retlen, req->buffer);
> + else
> + res = ps3vram_read(dev, offset, len, &retlen, req->buffer);
> +
> + if (res) {
> + dev_err(&dev->core, "%s failed\n", op);
> + goto out;
> + }
> +
> + if (retlen != len) {
> + dev_err(&dev->core, "Short %s\n", op);
> + goto out;
> + }
> +
> + dev_dbg(&dev->core, "%s completed\n", op);
> +
> + uptodate = 1;
> +
> +out:
> + spin_lock_irq(&priv->lock);
> + end_request(req, uptodate);
> + spin_unlock_irq(&priv->lock);
> +}
> +
> +static int ps3vram_thread(void *data)
> +{
> + struct ps3_system_bus_device *dev = data;
> + struct ps3vram_priv *priv = dev->core.driver_data;
> + struct request_queue *q = priv->queue;
> + struct request *req;
> +
> + dev_dbg(&dev->core, "%s init\n", __func__);
> +
> + current->flags |= PF_NOFREEZE;
> +
> + while (!kthread_should_stop()) {
> + spin_lock_irq(&priv->lock);
> + set_current_state(TASK_INTERRUPTIBLE);
> + req = elv_next_request(q);
> + if (!req) {
> + spin_unlock_irq(&priv->lock);
> + schedule();
> + continue;
> + }
> + if (!blk_fs_request(req)) {
> + blk_dump_rq_flags(req, DEVICE_NAME " bad request");
> + end_request(req, 0);
> + spin_unlock_irq(&priv->lock);
> + continue;
> + }
> + spin_unlock_irq(&priv->lock);
> + ps3vram_do_request(dev, req);
> + }
> +
> + dev_dbg(&dev->core, "%s exit\n", __func__);
> + return 0;
> +}
> +
> +static void ps3vram_request(struct request_queue *q)
> +{
> + struct ps3_system_bus_device *dev = q->queuedata;
> + struct ps3vram_priv *priv = dev->core.driver_data;
> +
> + dev_dbg(&dev->core, "Waking up thread\n");
> + wake_up_process(priv->thread);
> +}
> +
> +
> +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;
> + struct task_struct *task;
> +
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + error = -ENOMEM;
> + goto fail;
> + }
> +
> + dev->core.driver_data = priv;
> + spin_lock_init(&priv->lock);
> +
> + 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_dbg(&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 = memparse(size, &rest);
> + if (*rest == '-')
> + ddr_size -= ps3fb_videomemory.size;
> + ddr_size = ALIGN(ddr_size, 1024*1024);
> + if (ddr_size <= 0) {
> + 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 || ddr_size <= 0) {
> + 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_init_queue(ps3vram_request, &priv->lock);
> + if (!queue) {
> + dev_err(&dev->core, "blk_init_queue failed\n");
> + error = -ENOMEM;
> + goto out_cache_cleanup;
> + }
> +
> + priv->queue = queue;
> + queue->queuedata = dev;
> +
> + 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);
> +
> + task = kthread_run(ps3vram_thread, dev, DEVICE_NAME);
> + if (IS_ERR(task)) {
> + error = PTR_ERR(task);
> + goto fail_free_disk;
> + }
> + priv->thread = task;
> +
> + 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_free_disk:
> + put_disk(priv->gendisk);
> +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;
> +
> + BUG_ON(!elv_queue_empty(priv->queue));
> +
> + kthread_stop(priv->thread);
> + del_gendisk(priv->gendisk);
> + blk_cleanup_queue(priv->queue);
> + put_disk(priv->gendisk);
> + 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);
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