diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/ps3flash.c | 209 |
1 files changed, 104 insertions, 105 deletions
diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c index f7f21f4..d884d31 100644 --- a/drivers/char/ps3flash.c +++ b/drivers/char/ps3flash.c @@ -33,13 +33,16 @@ struct ps3flash_private { struct mutex mutex; /* Bounce buffer mutex */ + u64 chunk_sectors; + int tag; /* Start sector of buffer, -1 if invalid */ + bool dirty; }; static struct ps3_storage_device *ps3flash_dev; -static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev, - u64 lpar, u64 start_sector, - u64 sectors, int write) +static int ps3flash_read_write_sectors(struct ps3_storage_device *dev, + u64 lpar, u64 start_sector, u64 sectors, + int write) { u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors, write); @@ -48,33 +51,55 @@ static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev, __LINE__, write ? "write" : "read", res); return -EIO; } - return sectors; + return 0; } -static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev, - u64 start_sector, u64 sectors, - unsigned int sector_offset) +static int ps3flash_writeback(struct ps3_storage_device *dev) { - u64 max_sectors, lpar; + struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); + int res; - max_sectors = dev->bounce_size / dev->blk_size; - if (sectors > max_sectors) { - dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %llu\n", - __func__, __LINE__, max_sectors); - sectors = max_sectors; - } + if (!priv->dirty || priv->tag < 0) + return 0; + + res = ps3flash_read_write_sectors(dev, dev->bounce_lpar, priv->tag, + priv->chunk_sectors, 1); + if (res) + return res; - lpar = dev->bounce_lpar + sector_offset * dev->blk_size; - return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors, - 0); + priv->dirty = false; + return 0; } -static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev, - u64 start_sector) +static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector, + u64 sectors) { - u64 sectors = dev->bounce_size / dev->blk_size; - return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector, - sectors, 1); + struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); + unsigned int tag, offset; + u64 lpar; + int res; + + offset = start_sector % priv->chunk_sectors; + tag = start_sector - offset; + if (tag == priv->tag) + return 0; + + res = ps3flash_writeback(dev); + if (res) + return res; + + priv->tag = -1; + + lpar = dev->bounce_lpar + offset * dev->blk_size; + res = ps3flash_read_write_sectors(dev, lpar, start_sector, sectors, 0); + if (res) + return res; + + /* We don't bother caching reads smaller than the chunk size */ + if (sectors == priv->chunk_sectors) + priv->tag = tag; + + return 0; } static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin) @@ -109,8 +134,8 @@ static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, { struct ps3_storage_device *dev = ps3flash_dev; struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); - u64 size, start_sector, end_sector, offset; - ssize_t sectors_read; + u64 size, start_sector, end_sector, offset, sectors; + int res; size_t remaining, n; const void *src; @@ -130,30 +155,29 @@ static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, } start_sector = *pos / dev->blk_size; - offset = *pos % dev->blk_size; + offset = *pos % dev->bounce_size; end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size); remaining = count; do { + sectors = min(end_sector - start_sector, + priv->chunk_sectors - + start_sector % priv->chunk_sectors); + mutex_lock(&priv->mutex); - sectors_read = ps3flash_read_sectors(dev, start_sector, - end_sector-start_sector, - 0); - if (sectors_read < 0) { - mutex_unlock(&priv->mutex); + res = ps3flash_fetch(dev, start_sector, sectors); + if (res) goto fail; - } - n = min_t(u64, remaining, sectors_read*dev->blk_size-offset); - src = dev->bounce_buf+offset; + n = min_t(u64, remaining, dev->bounce_size - offset); + src = dev->bounce_buf + offset; dev_dbg(&dev->sbd.core, "%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n", __func__, __LINE__, n, src, userbuf, kernelbuf); if (userbuf) { if (copy_to_user(userbuf, src, n)) { - mutex_unlock(&priv->mutex); - sectors_read = -EFAULT; + res = -EFAULT; goto fail; } userbuf += n; @@ -167,14 +191,15 @@ static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, *pos += n; remaining -= n; - start_sector += sectors_read; + start_sector += sectors; offset = 0; } while (remaining > 0); return count; fail: - return sectors_read; + mutex_unlock(&priv->mutex); + return res; } static ssize_t ps3flash_write(const char __user *userbuf, @@ -182,11 +207,9 @@ static ssize_t ps3flash_write(const char __user *userbuf, { struct ps3_storage_device *dev = ps3flash_dev; struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); - u64 size, chunk_sectors, start_write_sector, end_write_sector, - end_read_sector, start_read_sector, head, tail, offset; - ssize_t res; + u64 size, sector, offset; + int res = 0; size_t remaining, n; - unsigned int sec_off; void *dst; dev_dbg(&dev->sbd.core, @@ -204,71 +227,23 @@ static ssize_t ps3flash_write(const char __user *userbuf, count = size - *pos; } - chunk_sectors = dev->bounce_size / dev->blk_size; - - start_write_sector = *pos / dev->bounce_size * chunk_sectors; + sector = *pos / dev->bounce_size * priv->chunk_sectors; offset = *pos % dev->bounce_size; - end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) * - chunk_sectors; - - end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size); - start_read_sector = (*pos + count) / dev->blk_size; - - /* - * As we have to write in 256 KiB chunks, while we can read in blk_size - * (usually 512 bytes) chunks, we perform the following steps: - * 1. Read from start_write_sector to end_read_sector ("head") - * 2. Read from start_read_sector to end_write_sector ("tail") - * 3. Copy data to buffer - * 4. Write from start_write_sector to end_write_sector - * All of this is complicated by using only one 256 KiB bounce buffer. - */ - - head = end_read_sector - start_write_sector; - tail = end_write_sector - start_read_sector; remaining = count; do { + n = min_t(u64, remaining, dev->bounce_size - offset); + mutex_lock(&priv->mutex); - if (end_read_sector >= start_read_sector) { - /* Merge head and tail */ - dev_dbg(&dev->sbd.core, - "Merged head and tail: %llu sectors at %llu\n", - chunk_sectors, start_write_sector); - res = ps3flash_read_sectors(dev, start_write_sector, - chunk_sectors, 0); - if (res < 0) - goto fail; - } else { - if (head) { - /* Read head */ - dev_dbg(&dev->sbd.core, - "head: %llu sectors at %llu\n", head, - start_write_sector); - res = ps3flash_read_sectors(dev, - start_write_sector, - head, 0); - if (res < 0) - goto fail; - } - if (start_read_sector < - start_write_sector+chunk_sectors) { - /* Read tail */ - dev_dbg(&dev->sbd.core, - "tail: %llu sectors at %llu\n", tail, - start_read_sector); - sec_off = start_read_sector-start_write_sector; - res = ps3flash_read_sectors(dev, - start_read_sector, - tail, sec_off); - if (res < 0) - goto fail; - } - } + if (n != dev->bounce_size) + res = ps3flash_fetch(dev, sector, priv->chunk_sectors); + else if (sector != priv->tag) + res = ps3flash_writeback(dev); + if (res) + goto fail; - n = min_t(u64, remaining, dev->bounce_size-offset); - dst = dev->bounce_buf+offset; + dst = dev->bounce_buf + offset; dev_dbg(&dev->sbd.core, "%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n", __func__, __LINE__, n, userbuf, kernelbuf, dst); @@ -284,16 +259,14 @@ static ssize_t ps3flash_write(const char __user *userbuf, kernelbuf += n; } - res = ps3flash_write_chunk(dev, start_write_sector); - if (res < 0) - goto fail; + priv->tag = sector; + priv->dirty = true; mutex_unlock(&priv->mutex); *pos += n; remaining -= n; - start_write_sector += chunk_sectors; - head = 0; + sector += priv->chunk_sectors; offset = 0; } while (remaining > 0); @@ -324,9 +297,31 @@ static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos) static ssize_t ps3flash_kernel_write(const void *buf, size_t count, loff_t pos) { - return ps3flash_write(NULL, buf, count, &pos); + ssize_t res; + int wb; + + res = ps3flash_write(NULL, buf, count, &pos); + if (res < 0) + return res; + + /* Make kernel writes synchronous */ + wb = ps3flash_writeback(ps3flash_dev); + if (wb) + return wb; + + return res; } +static int ps3flash_flush(struct file *file, fl_owner_t id) +{ + return ps3flash_writeback(ps3flash_dev); +} + +static int ps3flash_fsync(struct file *file, struct dentry *dentry, + int datasync) +{ + return ps3flash_writeback(ps3flash_dev); +} static irqreturn_t ps3flash_interrupt(int irq, void *data) { @@ -356,6 +351,8 @@ static const struct file_operations ps3flash_fops = { .llseek = ps3flash_llseek, .read = ps3flash_user_read, .write = ps3flash_user_write, + .flush = ps3flash_flush, + .fsync = ps3flash_fsync, }; static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = { @@ -411,9 +408,11 @@ static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev) ps3_system_bus_set_drvdata(&dev->sbd, priv); mutex_init(&priv->mutex); + priv->tag = -1; dev->bounce_size = ps3flash_bounce_buffer.size; dev->bounce_buf = ps3flash_bounce_buffer.address; + priv->chunk_sectors = dev->bounce_size / dev->blk_size; error = ps3stor_setup(dev, ps3flash_interrupt); if (error) |
