linux/drivers/char/ps3flash.c

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/*
* PS3 FLASH ROM Storage Driver
*
* Copyright (C) 2007 Sony Computer Entertainment Inc.
* Copyright 2007 Sony Corp.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published
* by the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/fs.h>
#include <linux/miscdevice.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <asm/lv1call.h>
#include <asm/ps3stor.h>
#define DEVICE_NAME "ps3flash"
#define FLASH_BLOCK_SIZE (256*1024)
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 int ps3flash_read_write_sectors(struct ps3_storage_device *dev,
u64 start_sector, int write)
{
struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar,
start_sector, priv->chunk_sectors,
write);
if (res) {
dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
__LINE__, write ? "write" : "read", res);
return -EIO;
}
return 0;
}
static int ps3flash_writeback(struct ps3_storage_device *dev)
{
struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
int res;
if (!priv->dirty || priv->tag < 0)
return 0;
res = ps3flash_read_write_sectors(dev, priv->tag, 1);
if (res)
return res;
priv->dirty = false;
return 0;
}
static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)
{
struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
int res;
if (start_sector == priv->tag)
return 0;
res = ps3flash_writeback(dev);
if (res)
return res;
priv->tag = -1;
res = ps3flash_read_write_sectors(dev, start_sector, 0);
if (res)
return res;
priv->tag = start_sector;
return 0;
}
static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
{
struct ps3_storage_device *dev = ps3flash_dev;
loff_t res;
mutex_lock(&file->f_mapping->host->i_mutex);
switch (origin) {
case 1:
offset += file->f_pos;
break;
case 2:
offset += dev->regions[dev->region_idx].size*dev->blk_size;
break;
}
if (offset < 0) {
res = -EINVAL;
goto out;
}
file->f_pos = offset;
res = file->f_pos;
out:
mutex_unlock(&file->f_mapping->host->i_mutex);
return res;
}
static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
size_t count, loff_t *pos)
{
struct ps3_storage_device *dev = ps3flash_dev;
struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
u64 size, sector, offset;
int res;
size_t remaining, n;
const void *src;
dev_dbg(&dev->sbd.core,
"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
__func__, __LINE__, count, *pos, userbuf, kernelbuf);
size = dev->regions[dev->region_idx].size*dev->blk_size;
if (*pos >= size || !count)
return 0;
if (*pos + count > size) {
dev_dbg(&dev->sbd.core,
"%s:%u Truncating count from %zu to %llu\n", __func__,
__LINE__, count, size - *pos);
count = size - *pos;
}
sector = *pos / dev->bounce_size * priv->chunk_sectors;
offset = *pos % dev->bounce_size;
remaining = count;
do {
n = min_t(u64, remaining, dev->bounce_size - offset);
src = dev->bounce_buf + offset;
mutex_lock(&priv->mutex);
res = ps3flash_fetch(dev, sector);
if (res)
goto fail;
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)) {
res = -EFAULT;
goto fail;
}
userbuf += n;
}
if (kernelbuf) {
memcpy(kernelbuf, src, n);
kernelbuf += n;
}
mutex_unlock(&priv->mutex);
*pos += n;
remaining -= n;
sector += priv->chunk_sectors;
offset = 0;
} while (remaining > 0);
return count;
fail:
mutex_unlock(&priv->mutex);
return res;
}
static ssize_t ps3flash_write(const char __user *userbuf,
const void *kernelbuf, size_t count, loff_t *pos)
{
struct ps3_storage_device *dev = ps3flash_dev;
struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
u64 size, sector, offset;
int res = 0;
size_t remaining, n;
void *dst;
dev_dbg(&dev->sbd.core,
"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
__func__, __LINE__, count, *pos, userbuf, kernelbuf);
size = dev->regions[dev->region_idx].size*dev->blk_size;
if (*pos >= size || !count)
return 0;
if (*pos + count > size) {
dev_dbg(&dev->sbd.core,
"%s:%u Truncating count from %zu to %llu\n", __func__,
__LINE__, count, size - *pos);
count = size - *pos;
}
sector = *pos / dev->bounce_size * priv->chunk_sectors;
offset = *pos % dev->bounce_size;
remaining = count;
do {
n = min_t(u64, remaining, dev->bounce_size - offset);
dst = dev->bounce_buf + offset;
mutex_lock(&priv->mutex);
if (n != dev->bounce_size)
res = ps3flash_fetch(dev, sector);
else if (sector != priv->tag)
res = ps3flash_writeback(dev);
if (res)
goto fail;
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);
if (userbuf) {
if (copy_from_user(dst, userbuf, n)) {
res = -EFAULT;
goto fail;
}
userbuf += n;
}
if (kernelbuf) {
memcpy(dst, kernelbuf, n);
kernelbuf += n;
}
priv->tag = sector;
priv->dirty = true;
mutex_unlock(&priv->mutex);
*pos += n;
remaining -= n;
sector += priv->chunk_sectors;
offset = 0;
} while (remaining > 0);
return count;
fail:
mutex_unlock(&priv->mutex);
return res;
}
static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
size_t count, loff_t *pos)
{
return ps3flash_read(buf, NULL, count, pos);
}
static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
return ps3flash_write(buf, NULL, count, pos);
}
static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
{
return ps3flash_read(NULL, buf, count, &pos);
}
static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
loff_t 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, int datasync)
{
return ps3flash_writeback(ps3flash_dev);
}
static irqreturn_t ps3flash_interrupt(int irq, void *data)
{
struct ps3_storage_device *dev = data;
int res;
u64 tag, status;
res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
if (tag != dev->tag)
dev_err(&dev->sbd.core,
"%s:%u: tag mismatch, got %llx, expected %llx\n",
__func__, __LINE__, tag, dev->tag);
if (res) {
dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
__func__, __LINE__, res, status);
} else {
dev->lv1_status = status;
complete(&dev->done);
}
return IRQ_HANDLED;
}
static const struct file_operations ps3flash_fops = {
.owner = THIS_MODULE,
.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 = {
.read = ps3flash_kernel_read,
.write = ps3flash_kernel_write,
};
static struct miscdevice ps3flash_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &ps3flash_fops,
};
static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
{
struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
struct ps3flash_private *priv;
int error;
unsigned long tmp;
tmp = dev->regions[dev->region_idx].start*dev->blk_size;
if (tmp % FLASH_BLOCK_SIZE) {
dev_err(&dev->sbd.core,
"%s:%u region start %lu is not aligned\n", __func__,
__LINE__, tmp);
return -EINVAL;
}
tmp = dev->regions[dev->region_idx].size*dev->blk_size;
if (tmp % FLASH_BLOCK_SIZE) {
dev_err(&dev->sbd.core,
"%s:%u region size %lu is not aligned\n", __func__,
__LINE__, tmp);
return -EINVAL;
}
/* use static buffer, kmalloc cannot allocate 256 KiB */
if (!ps3flash_bounce_buffer.address)
return -ENODEV;
if (ps3flash_dev) {
dev_err(&dev->sbd.core,
"Only one FLASH device is supported\n");
return -EBUSY;
}
ps3flash_dev = dev;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
error = -ENOMEM;
goto fail;
}
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)
goto fail_free_priv;
ps3flash_misc.parent = &dev->sbd.core;
error = misc_register(&ps3flash_misc);
if (error) {
dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
__func__, __LINE__, error);
goto fail_teardown;
}
dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
__func__, __LINE__, ps3flash_misc.minor);
ps3_os_area_flash_register(&ps3flash_kernel_ops);
return 0;
fail_teardown:
ps3stor_teardown(dev);
fail_free_priv:
kfree(priv);
ps3_system_bus_set_drvdata(&dev->sbd, NULL);
fail:
ps3flash_dev = NULL;
return error;
}
static int ps3flash_remove(struct ps3_system_bus_device *_dev)
{
struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
ps3_os_area_flash_register(NULL);
misc_deregister(&ps3flash_misc);
ps3stor_teardown(dev);
kfree(ps3_system_bus_get_drvdata(&dev->sbd));
ps3_system_bus_set_drvdata(&dev->sbd, NULL);
ps3flash_dev = NULL;
return 0;
}
static struct ps3_system_bus_driver ps3flash = {
.match_id = PS3_MATCH_ID_STOR_FLASH,
.core.name = DEVICE_NAME,
.core.owner = THIS_MODULE,
.probe = ps3flash_probe,
.remove = ps3flash_remove,
.shutdown = ps3flash_remove,
};
static int __init ps3flash_init(void)
{
return ps3_system_bus_driver_register(&ps3flash);
}
static void __exit ps3flash_exit(void)
{
ps3_system_bus_driver_unregister(&ps3flash);
}
module_init(ps3flash_init);
module_exit(ps3flash_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);