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    SubjectRe: [PATCH/RFC] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device
    From
    Date
    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@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@sonycom.com>
    > Cc: Jim Paris <jim@jtan.com>
    > Cc: Vivien Chappelier <vivien.chappelier@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@jtan.com>
    > + * Added support RSX DMA Vivien Chappelier <vivien.chappelier@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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      Last update: 2009-03-05 00:31    [W:0.101 / U:30.576 seconds]
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