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nuttx/drivers/mtd/ftl.c
Xiang Xiao 73723dd31c drivers/rwbuffer: Avoid ftl driver allocate the temporary erase buffer 
If the buffer to be flushed isn't multipled by the erase size,
let's pad the buffer proactively to avoid the allocation in ftl.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I6d7904aafab93a7886a594319d65826b81cd3cd1

3Change-Id: I88276149cc7826e7416929ca60b06314e96079a6
2020-08-29 02:57:36 -07:00

712 lines
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/****************************************************************************
* drivers/mtd/ftl.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/mtd/mtd.h>
#include <nuttx/drivers/rwbuffer.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Check if read/write buffer support is needed */
#if defined(CONFIG_FTL_READAHEAD) || defined(CONFIG_FTL_WRITEBUFFER)
# define FTL_HAVE_RWBUFFER 1
#endif
/* The maximum length of the device name paths is the maximum length of a
* name plus 5 for the the length of "/dev/" and a NUL terminator.
*/
#define DEV_NAME_MAX (NAME_MAX + 5)
/****************************************************************************
* Private Types
****************************************************************************/
struct ftl_struct_s
{
FAR struct mtd_dev_s *mtd; /* Contained MTD interface */
struct mtd_geometry_s geo; /* Device geometry */
#ifdef FTL_HAVE_RWBUFFER
struct rwbuffer_s rwb; /* Read-ahead/write buffer support */
#endif
uint16_t blkper; /* R/W blocks per erase block */
uint16_t refs; /* Number of references */
bool unlinked; /* The driver has been unlinked */
FAR uint8_t *eblock; /* One, in-memory erase block */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int ftl_open(FAR struct inode *inode);
static int ftl_close(FAR struct inode *inode);
static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
off_t startblock, size_t nblocks);
static ssize_t ftl_read(FAR struct inode *inode, FAR unsigned char *buffer,
size_t start_sector, unsigned int nsectors);
static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
off_t startblock, size_t nblocks);
static ssize_t ftl_write(FAR struct inode *inode,
FAR const unsigned char *buffer, size_t start_sector,
unsigned int nsectors);
static int ftl_geometry(FAR struct inode *inode,
FAR struct geometry *geometry);
static int ftl_ioctl(FAR struct inode *inode, int cmd,
unsigned long arg);
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
static int ftl_unlink(FAR struct inode *inode);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct block_operations g_bops =
{
ftl_open, /* open */
ftl_close, /* close */
ftl_read, /* read */
ftl_write, /* write */
ftl_geometry, /* geometry */
ftl_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, ftl_unlink /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ftl_open
*
* Description: Open the block device
*
****************************************************************************/
static int ftl_open(FAR struct inode *inode)
{
FAR struct ftl_struct_s *dev;
DEBUGASSERT(inode && inode->i_private);
dev = (FAR struct ftl_struct_s *)inode->i_private;
dev->refs++;
return OK;
}
/****************************************************************************
* Name: ftl_close
*
* Description: close the block device
*
****************************************************************************/
static int ftl_close(FAR struct inode *inode)
{
FAR struct ftl_struct_s *dev;
DEBUGASSERT(inode && inode->i_private);
dev = (FAR struct ftl_struct_s *)inode->i_private;
#ifdef CONFIG_FTL_WRITEBUFFER
rwb_flush(&dev->rwb);
#endif
if (--dev->refs == 0 && dev->unlinked)
{
#ifdef FTL_HAVE_RWBUFFER
rwb_uninitialize(&dev->rwb);
#endif
if (dev->eblock)
{
kmm_free(dev->eblock);
}
kmm_free(dev);
}
return OK;
}
/****************************************************************************
* Name: ftl_reload
*
* Description: Read the specified number of sectors
*
****************************************************************************/
static ssize_t ftl_reload(FAR void *priv, FAR uint8_t *buffer,
off_t startblock, size_t nblocks)
{
struct ftl_struct_s *dev = (struct ftl_struct_s *)priv;
ssize_t nread;
/* Read the full erase block into the buffer */
nread = MTD_BREAD(dev->mtd, startblock, nblocks, buffer);
if (nread != nblocks)
{
ferr("ERROR: Read %d blocks starting at block %d failed: %d\n",
nblocks, startblock, nread);
}
return nread;
}
/****************************************************************************
* Name: ftl_read
*
* Description: Read the specified number of sectors
*
****************************************************************************/
static ssize_t ftl_read(FAR struct inode *inode, unsigned char *buffer,
size_t start_sector, unsigned int nsectors)
{
FAR struct ftl_struct_s *dev;
finfo("sector: %d nsectors: %d\n", start_sector, nsectors);
DEBUGASSERT(inode && inode->i_private);
dev = (FAR struct ftl_struct_s *)inode->i_private;
#ifdef FTL_HAVE_RWBUFFER
return rwb_read(&dev->rwb, start_sector, nsectors, buffer);
#else
return ftl_reload(dev, buffer, start_sector, nsectors);
#endif
}
/****************************************************************************
* Name: ftl_flush
*
* Description: Write the specified number of sectors
*
****************************************************************************/
static int ftl_alloc_eblock(FAR struct ftl_struct_s *dev)
{
if (dev->eblock == NULL)
{
/* Allocate one, in-memory erase block buffer */
dev->eblock = (FAR uint8_t *)kmm_malloc(dev->geo.erasesize);
}
return dev->eblock != NULL ? OK : -ENOMEM;
}
static ssize_t ftl_flush(FAR void *priv, FAR const uint8_t *buffer,
off_t startblock, size_t nblocks)
{
struct ftl_struct_s *dev = (struct ftl_struct_s *)priv;
off_t alignedblock;
off_t mask;
off_t rwblock;
off_t eraseblock;
off_t offset;
size_t remaining;
size_t nxfrd;
int nbytes;
int ret;
/* Get the aligned block. Here is is assumed: (1) The number of R/W blocks
* per erase block is a power of 2, and (2) the erase begins with that same
* alignment.
*/
mask = dev->blkper - 1;
alignedblock = (startblock + mask) & ~mask;
/* Handle partial erase blocks before the first unaligned block */
remaining = nblocks;
if (alignedblock > startblock)
{
/* Check if the write is shorter than to the end of the erase block */
bool short_write = (remaining < (alignedblock - startblock));
ret = ftl_alloc_eblock(dev);
if (ret < 0)
{
ferr("ERROR: Failed to allocate an erase block buffer\n");
return ret;
}
/* Read the full erase block into the buffer */
rwblock = startblock & ~mask;
nxfrd = MTD_BREAD(dev->mtd, rwblock, dev->blkper, dev->eblock);
if (nxfrd != dev->blkper)
{
ferr("ERROR: Read erase block %d failed: %d\n", rwblock, nxfrd);
return -EIO;
}
/* Then erase the erase block */
eraseblock = rwblock / dev->blkper;
ret = MTD_ERASE(dev->mtd, eraseblock, 1);
if (ret < 0)
{
ferr("ERROR: Erase block=%d failed: %d\n", eraseblock, ret);
return ret;
}
/* Copy the user data at the end of the buffered erase block */
offset = (startblock & mask) * dev->geo.blocksize;
if (short_write)
{
nbytes = remaining * dev->geo.blocksize;
}
else
{
nbytes = dev->geo.erasesize - offset;
}
finfo("Copy %d bytes into erase block=%d at offset=%d\n",
nbytes, eraseblock, offset);
memcpy(dev->eblock + offset, buffer, nbytes);
/* And write the erase block back to flash */
nxfrd = MTD_BWRITE(dev->mtd, rwblock, dev->blkper, dev->eblock);
if (nxfrd != dev->blkper)
{
ferr("ERROR: Write erase block %d failed: %d\n", rwblock, nxfrd);
return -EIO;
}
/* Then update for amount written */
if (short_write)
{
remaining = 0;
}
else
{
remaining -= dev->blkper - (startblock & mask);
}
buffer += nbytes;
}
/* How handle full erase pages in the middle */
while (remaining >= dev->blkper)
{
/* Erase the erase block */
eraseblock = alignedblock / dev->blkper;
ret = MTD_ERASE(dev->mtd, eraseblock, 1);
if (ret < 0)
{
ferr("ERROR: Erase block=%d failed: %d\n", eraseblock, ret);
return ret;
}
/* Write a full erase back to flash */
finfo("Write %d bytes into erase block=%d at offset=0\n",
dev->geo.erasesize, alignedblock);
nxfrd = MTD_BWRITE(dev->mtd, alignedblock, dev->blkper, buffer);
if (nxfrd != dev->blkper)
{
ferr("ERROR: Write erase block %d failed: %d\n",
alignedblock, nxfrd);
return -EIO;
}
/* Then update for amount written */
alignedblock += dev->blkper;
remaining -= dev->blkper;
buffer += dev->geo.erasesize;
}
/* Finally, handle any partial blocks after the last full erase block */
if (remaining > 0)
{
ret = ftl_alloc_eblock(dev);
if (ret < 0)
{
ferr("ERROR: Failed to allocate an erase block buffer\n");
return ret;
}
/* Read the full erase block into the buffer */
nxfrd = MTD_BREAD(dev->mtd, alignedblock, dev->blkper, dev->eblock);
if (nxfrd != dev->blkper)
{
ferr("ERROR: Read erase block %d failed: %d\n",
alignedblock, nxfrd);
return -EIO;
}
/* Then erase the erase block */
eraseblock = alignedblock / dev->blkper;
ret = MTD_ERASE(dev->mtd, eraseblock, 1);
if (ret < 0)
{
ferr("ERROR: Erase block=%d failed: %d\n", eraseblock, ret);
return ret;
}
/* Copy the user data at the beginning the buffered erase block */
nbytes = remaining * dev->geo.blocksize;
finfo("Copy %d bytes into erase block=%d at offset=0\n",
nbytes, alignedblock);
memcpy(dev->eblock, buffer, nbytes);
/* And write the erase back to flash */
nxfrd = MTD_BWRITE(dev->mtd, alignedblock, dev->blkper, dev->eblock);
if (nxfrd != dev->blkper)
{
ferr("ERROR: Write erase block %d failed: %d\n",
alignedblock, nxfrd);
return -EIO;
}
}
return nblocks;
}
/****************************************************************************
* Name: ftl_write
*
* Description: Write (or buffer) the specified number of sectors
*
****************************************************************************/
static ssize_t ftl_write(FAR struct inode *inode,
FAR const unsigned char *buffer,
size_t start_sector, unsigned int nsectors)
{
struct ftl_struct_s *dev;
finfo("sector: %d nsectors: %d\n", start_sector, nsectors);
DEBUGASSERT(inode && inode->i_private);
dev = (struct ftl_struct_s *)inode->i_private;
#ifdef FTL_HAVE_RWBUFFER
return rwb_write(&dev->rwb, start_sector, nsectors, buffer);
#else
return ftl_flush(dev, buffer, start_sector, nsectors);
#endif
}
/****************************************************************************
* Name: ftl_geometry
*
* Description: Return device geometry
*
****************************************************************************/
static int ftl_geometry(FAR struct inode *inode,
FAR struct geometry *geometry)
{
FAR struct ftl_struct_s *dev;
finfo("Entry\n");
DEBUGASSERT(inode);
if (geometry)
{
dev = (struct ftl_struct_s *)inode->i_private;
geometry->geo_available = true;
geometry->geo_mediachanged = false;
geometry->geo_writeenabled = true;
geometry->geo_nsectors = dev->geo.neraseblocks * dev->blkper;
geometry->geo_sectorsize = dev->geo.blocksize;
finfo("available: true mediachanged: false writeenabled: %s\n",
geometry->geo_writeenabled ? "true" : "false");
finfo("nsectors: %d sectorsize: %d\n",
geometry->geo_nsectors, geometry->geo_sectorsize);
return OK;
}
return -EINVAL;
}
/****************************************************************************
* Name: ftl_ioctl
*
* Description: Return device geometry
*
****************************************************************************/
static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
{
struct ftl_struct_s *dev ;
int ret;
finfo("Entry\n");
DEBUGASSERT(inode && inode->i_private);
dev = (struct ftl_struct_s *)inode->i_private;
/* Only one block driver ioctl command is supported by this driver (and
* that command is just passed on to the MTD driver in a slightly
* different form).
*/
if (cmd == BIOC_XIPBASE)
{
/* The argument accompanying the BIOC_XIPBASE should be non-NULL. If
* DEBUG is enabled, we will catch it here instead of in the MTD
* driver.
*/
#ifdef CONFIG_DEBUG_FEATURES
if (arg == 0)
{
ferr("ERROR: BIOC_XIPBASE argument is NULL\n");
return -EINVAL;
}
#endif
/* Change the BIOC_XIPBASE command to the MTDIOC_XIPBASE command. */
cmd = MTDIOC_XIPBASE;
}
#ifdef CONFIG_FTL_WRITEBUFFER
else if (cmd == BIOC_FLUSH)
{
return rwb_flush(&dev->rwb);
}
#endif
/* No other block driver ioctl commands are not recognized by this
* driver. Other possible MTD driver ioctl commands are passed through
* to the MTD driver (unchanged).
*/
ret = MTD_IOCTL(dev->mtd, cmd, arg);
if (ret < 0)
{
ferr("ERROR: MTD ioctl(%04x) failed: %d\n", cmd, ret);
}
return ret;
}
/****************************************************************************
* Name: ftl_unlink
*
* Description: Unlink the device
*
****************************************************************************/
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
static int ftl_unlink(FAR struct inode *inode)
{
FAR struct ftl_struct_s *dev;
DEBUGASSERT(inode && inode->i_private);
dev = (FAR struct ftl_struct_s *)inode->i_private;
dev->unlinked = true;
if (dev->refs == 0)
{
#ifdef FTL_HAVE_RWBUFFER
rwb_uninitialize(&dev->rwb);
#endif
if (dev->eblock)
{
kmm_free(dev->eblock);
}
kmm_free(dev);
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ftl_initialize_by_path
*
* Description:
* Initialize to provide a block driver wrapper around an MTD interface
*
* Input Parameters:
* path - The block device path.
* mtd - The MTD device that supports the FLASH interface.
*
****************************************************************************/
int ftl_initialize_by_path(FAR const char *path, FAR struct mtd_dev_s *mtd)
{
struct ftl_struct_s *dev;
int ret = -ENOMEM;
/* Sanity check */
if (path == NULL || mtd == NULL)
{
return -EINVAL;
}
finfo("path=\"%s\"\n", path);
/* Allocate a FTL device structure */
dev = (FAR struct ftl_struct_s *)kmm_zalloc(sizeof(struct ftl_struct_s));
if (dev)
{
/* Initialize the FTL device structure */
dev->mtd = mtd;
/* Get the device geometry. (casting to uintptr_t first eliminates
* complaints on some architectures where the sizeof long is different
* from the size of a pointer).
*/
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY,
(unsigned long)((uintptr_t)&dev->geo));
if (ret < 0)
{
ferr("ERROR: MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", ret);
kmm_free(dev);
return ret;
}
/* Get the number of R/W blocks per erase block */
dev->blkper = dev->geo.erasesize / dev->geo.blocksize;
DEBUGASSERT(dev->blkper * dev->geo.blocksize == dev->geo.erasesize);
/* Configure read-ahead/write buffering */
#ifdef FTL_HAVE_RWBUFFER
dev->rwb.blocksize = dev->geo.blocksize;
dev->rwb.nblocks = dev->geo.neraseblocks * dev->blkper;
dev->rwb.dev = (FAR void *)dev;
dev->rwb.wrflush = ftl_flush;
dev->rwb.rhreload = ftl_reload;
#if defined(CONFIG_FTL_WRITEBUFFER)
dev->rwb.wrmaxblocks = dev->blkper;
dev->rwb.wralignblocks = dev->blkper;
#endif
#ifdef CONFIG_FTL_READAHEAD
dev->rwb.rhmaxblocks = dev->blkper;
#endif
ret = rwb_initialize(&dev->rwb);
if (ret < 0)
{
ferr("ERROR: rwb_initialize failed: %d\n", ret);
kmm_free(dev);
return ret;
}
#endif
/* Inode private data is a reference to the FTL device structure */
ret = register_blockdriver(path, &g_bops, 0, dev);
if (ret < 0)
{
ferr("ERROR: register_blockdriver failed: %d\n", -ret);
#ifdef FTL_HAVE_RWBUFFER
rwb_uninitialize(&dev->rwb);
#endif
kmm_free(dev);
}
}
return ret;
}
/****************************************************************************
* Name: ftl_initialize
*
* Description:
* Initialize to provide a block driver wrapper around an MTD interface
*
* Input Parameters:
* minor - The minor device number. The MTD block device will be
* registered as as /dev/mtdblockN where N is the minor number.
* mtd - The MTD device that supports the FLASH interface.
*
****************************************************************************/
int ftl_initialize(int minor, FAR struct mtd_dev_s *mtd)
{
char path[DEV_NAME_MAX];
#ifdef CONFIG_DEBUG_FEATURES
/* Sanity check */
if (minor < 0 || minor > 255)
{
return -EINVAL;
}
#endif
/* Do the real work by ftl_initialize_by_path */
snprintf(path, DEV_NAME_MAX, "/dev/mtdblock%d", minor);
return ftl_initialize_by_path(path, mtd);
}
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