This driver is the last/only user of NAND_OWN_BUFFERS. Boris suggested
to remove this flag.
Taking a closer look at this driver, it calls dma_alloc_coherent() for
the concatenated area for the DMA bounce buffer + struct nand_buffers,
but the latter does not need to be DMA-coherent; cafe_{write,read}_buf
simply do memcpy() between buffers when usedma==1.
Let's do dma_alloc_coherent() for the DMA bounce buffer in the front,
and leave the nand_buffers allocation to nand_scan_tail(), then rip off
NAND_OWN_BUFFERS.
The magic number, 2112, is still mysterious (hard-coded writesize +
oobsize ?), but this is not our main interest. I am keeping it.
Suggested-by: Boris Brezillon <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>
---
Changes in v2:
- Newly added
drivers/mtd/nand/cafe_nand.c | 24 ++++--------------------
1 file changed, 4 insertions(+), 20 deletions(-)
diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index bc558c4..add4613 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -613,7 +613,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
uint32_t ctrl;
int err = 0;
int old_dma;
- struct nand_buffers *nbuf;
/* Very old versions shared the same PCI ident for all three
functions on the chip. Verify the class too... */
@@ -661,7 +660,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
/* Enable the following for a flash based bad block table */
cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
- cafe->nand.options = NAND_OWN_BUFFERS;
if (skipbbt) {
cafe->nand.options |= NAND_SKIP_BBTSCAN;
@@ -731,15 +729,12 @@ static int cafe_nand_probe(struct pci_dev *pdev,
if (err)
goto out_irq;
- cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev,
- 2112 + sizeof(struct nand_buffers) +
- mtd->writesize + mtd->oobsize,
- &cafe->dmaaddr, GFP_KERNEL);
+ cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
+ &cafe->dmaaddr, GFP_KERNEL);
if (!cafe->dmabuf) {
err = -ENOMEM;
goto out_irq;
}
- cafe->nand.buffers = nbuf = (void *)cafe->dmabuf + 2112;
/* Set up DMA address */
cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
@@ -752,11 +747,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
- /* this driver does not need the @ecccalc and @ecccode */
- nbuf->ecccalc = NULL;
- nbuf->ecccode = NULL;
- nbuf->databuf = (uint8_t *)(nbuf + 1);
-
/* Restore the DMA flag */
usedma = old_dma;
@@ -801,10 +791,7 @@ static int cafe_nand_probe(struct pci_dev *pdev,
goto out;
out_free_dma:
- dma_free_coherent(&cafe->pdev->dev,
- 2112 + sizeof(struct nand_buffers) +
- mtd->writesize + mtd->oobsize,
- cafe->dmabuf, cafe->dmaaddr);
+ dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
out_irq:
/* Disable NAND IRQ in global IRQ mask register */
cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
@@ -829,10 +816,7 @@ static void cafe_nand_remove(struct pci_dev *pdev)
nand_release(mtd);
free_rs(cafe->rs);
pci_iounmap(pdev, cafe->mmio);
- dma_free_coherent(&cafe->pdev->dev,
- 2112 + sizeof(struct nand_buffers) +
- mtd->writesize + mtd->oobsize,
- cafe->dmabuf, cafe->dmaaddr);
+ dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
kfree(cafe);
}
--
2.7.4
The last/only user of NAND_OWN_BUFFERS (cafe_nand.c) has been reworked.
This flag is no longer needed.
Suggested-by: Boris Brezillon <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>
---
Changes in v2:
- Newly added
drivers/mtd/nand/nand_base.c | 45 ++++++++++++++++++++------------------------
include/linux/mtd/rawnand.h | 5 -----
2 files changed, 20 insertions(+), 30 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6135d00..0cc61b1 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4646,35 +4646,30 @@ int nand_scan_tail(struct mtd_info *mtd)
return -EINVAL;
}
- if (!(chip->options & NAND_OWN_BUFFERS)) {
- nbuf = kzalloc(sizeof(*nbuf), GFP_KERNEL);
- if (!nbuf)
- return -ENOMEM;
-
- nbuf->ecccalc = kmalloc(mtd->oobsize, GFP_KERNEL);
- if (!nbuf->ecccalc) {
- ret = -ENOMEM;
- goto err_free_nbuf;
- }
+ nbuf = kzalloc(sizeof(*nbuf), GFP_KERNEL);
+ if (!nbuf)
+ return -ENOMEM;
- nbuf->ecccode = kmalloc(mtd->oobsize, GFP_KERNEL);
- if (!nbuf->ecccode) {
- ret = -ENOMEM;
- goto err_free_nbuf;
- }
+ nbuf->ecccalc = kmalloc(mtd->oobsize, GFP_KERNEL);
+ if (!nbuf->ecccalc) {
+ ret = -ENOMEM;
+ goto err_free_nbuf;
+ }
- nbuf->databuf = kmalloc(mtd->writesize + mtd->oobsize,
- GFP_KERNEL);
- if (!nbuf->databuf) {
- ret = -ENOMEM;
- goto err_free_nbuf;
- }
+ nbuf->ecccode = kmalloc(mtd->oobsize, GFP_KERNEL);
+ if (!nbuf->ecccode) {
+ ret = -ENOMEM;
+ goto err_free_nbuf;
+ }
- chip->buffers = nbuf;
- } else if (!chip->buffers) {
- return -ENOMEM;
+ nbuf->databuf = kmalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
+ if (!nbuf->databuf) {
+ ret = -ENOMEM;
+ goto err_free_nbuf;
}
+ chip->buffers = nbuf;
+
/*
* FIXME: some NAND manufacturer drivers expect the first die to be
* selected when manufacturer->init() is called. They should be fixed
@@ -5032,7 +5027,7 @@ void nand_cleanup(struct nand_chip *chip)
/* Free bad block table memory */
kfree(chip->bbt);
- if (!(chip->options & NAND_OWN_BUFFERS) && chip->buffers) {
+ if (chip->buffers) {
kfree(chip->buffers->databuf);
kfree(chip->buffers->ecccode);
kfree(chip->buffers->ecccalc);
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 749bb08..5b24a8e 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -191,11 +191,6 @@ enum nand_ecc_algo {
/* Non chip related options */
/* This option skips the bbt scan during initialization. */
#define NAND_SKIP_BBTSCAN 0x00010000
-/*
- * This option is defined if the board driver allocates its own buffers
- * (e.g. because it needs them DMA-coherent).
- */
-#define NAND_OWN_BUFFERS 0x00020000
/* Chip may not exist, so silence any errors in scan */
#define NAND_SCAN_SILENT_NODEV 0x00040000
/*
--
2.7.4
struct nand_buffers is malloc'ed in nand_scan_tail() just for
containing three pointers. Squash this struct into nand_chip.
Move and rename as follows:
chip->buffers->ecccalc -> chip->ecc.calc_buf
chip->buffers->ecccode -> chip->ecc.code_buf
chip->buffers->databuf -> chip->data_buf
Signed-off-by: Masahiro Yamada <[email protected]>
---
Changes in v2:
- Rename as Boris suggested
- Based on cafe_nand rework
drivers/mtd/nand/brcmnand/brcmnand.c | 2 +-
drivers/mtd/nand/denali.c | 2 +-
drivers/mtd/nand/fsmc_nand.c | 4 +-
drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 4 +-
drivers/mtd/nand/nand_base.c | 91 ++++++++++++++--------------------
drivers/mtd/nand/nand_bbt.c | 2 +-
drivers/mtd/nand/omap2.c | 10 ++--
drivers/mtd/nand/sunxi_nand.c | 6 +--
include/linux/mtd/rawnand.h | 23 +++------
9 files changed, 59 insertions(+), 85 deletions(-)
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index e0eb51d..cc13c88 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1681,7 +1681,7 @@ static int brcmstb_nand_verify_erased_page(struct mtd_info *mtd,
int ret;
if (!buf) {
- buf = chip->buffers->databuf;
+ buf = chip->data_buf;
/* Invalidate page cache */
chip->pagebuf = -1;
}
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 2fc964b..3e61ac4 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -328,7 +328,7 @@ static int denali_check_erased_page(struct mtd_info *mtd,
unsigned long uncor_ecc_flags,
unsigned int max_bitflips)
{
- uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_code = chip->ecc.code_buf;
int ecc_steps = chip->ecc.steps;
int ecc_size = chip->ecc.size;
int ecc_bytes = chip->ecc.bytes;
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index eac15d9..574b043 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -684,8 +684,8 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
- uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
+ uint8_t *ecc_code = chip->ecc.code_buf;
int off, len, group = 0;
/*
* ecc_oob is intentionally taken as uint16_t. In 16bit devices, we
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 50f8d4a..a760ae7 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1712,7 +1712,7 @@ static int mx23_check_transcription_stamp(struct gpmi_nand_data *this)
unsigned int search_area_size_in_strides;
unsigned int stride;
unsigned int page;
- uint8_t *buffer = chip->buffers->databuf;
+ uint8_t *buffer = chip->data_buf;
int saved_chip_number;
int found_an_ncb_fingerprint = false;
@@ -1771,7 +1771,7 @@ static int mx23_write_transcription_stamp(struct gpmi_nand_data *this)
unsigned int block;
unsigned int stride;
unsigned int page;
- uint8_t *buffer = chip->buffers->databuf;
+ uint8_t *buffer = chip->data_buf;
int saved_chip_number;
int status;
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 0cc61b1..fe583e4 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1456,8 +1456,8 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
- uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
+ uint8_t *ecc_code = chip->ecc.code_buf;
unsigned int max_bitflips = 0;
chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
@@ -1529,7 +1529,7 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
/* Calculate ECC */
for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size)
- chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]);
+ chip->ecc.calculate(mtd, p, &chip->ecc.calc_buf[i]);
/*
* The performance is faster if we position offsets according to
@@ -1563,7 +1563,7 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
}
- ret = mtd_ooblayout_get_eccbytes(mtd, chip->buffers->ecccode,
+ ret = mtd_ooblayout_get_eccbytes(mtd, chip->ecc.code_buf,
chip->oob_poi, index, eccfrag_len);
if (ret)
return ret;
@@ -1572,13 +1572,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
int stat;
- stat = chip->ecc.correct(mtd, p,
- &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]);
+ stat = chip->ecc.correct(mtd, p, &chip->ecc.code_buf[i],
+ &chip->ecc.calc_buf[i]);
if (stat == -EBADMSG &&
(chip->ecc.options & NAND_ECC_GENERIC_ERASED_CHECK)) {
/* check for empty pages with bitflips */
stat = nand_check_erased_ecc_chunk(p, chip->ecc.size,
- &chip->buffers->ecccode[i],
+ &chip->ecc.code_buf[i],
chip->ecc.bytes,
NULL, 0,
chip->ecc.strength);
@@ -1611,8 +1611,8 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
- uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
+ uint8_t *ecc_code = chip->ecc.code_buf;
unsigned int max_bitflips = 0;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -1674,8 +1674,8 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
- uint8_t *ecc_code = chip->buffers->ecccode;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
+ uint8_t *ecc_code = chip->ecc.code_buf;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
unsigned int max_bitflips = 0;
/* Read the OOB area first */
@@ -1894,7 +1894,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
/* Is the current page in the buffer? */
if (realpage != chip->pagebuf || oob) {
- bufpoi = use_bufpoi ? chip->buffers->databuf : buf;
+ bufpoi = use_bufpoi ? chip->data_buf : buf;
if (use_bufpoi && aligned)
pr_debug("%s: using read bounce buffer for buf@%p\n",
@@ -1938,7 +1938,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
/* Invalidate page cache */
chip->pagebuf = -1;
}
- memcpy(buf, chip->buffers->databuf + col, bytes);
+ memcpy(buf, chip->data_buf + col, bytes);
}
if (unlikely(oob)) {
@@ -1979,7 +1979,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
buf += bytes;
max_bitflips = max_t(unsigned int, max_bitflips, ret);
} else {
- memcpy(buf, chip->buffers->databuf + col, bytes);
+ memcpy(buf, chip->data_buf + col, bytes);
buf += bytes;
max_bitflips = max_t(unsigned int, max_bitflips,
chip->pagebuf_bitflips);
@@ -2403,7 +2403,7 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
int i, eccsize = chip->ecc.size, ret;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
const uint8_t *p = buf;
/* Software ECC calculation */
@@ -2433,7 +2433,7 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
int i, eccsize = chip->ecc.size, ret;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
const uint8_t *p = buf;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -2469,7 +2469,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
int oob_required, int page)
{
uint8_t *oob_buf = chip->oob_poi;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
+ uint8_t *ecc_calc = chip->ecc.calc_buf;
int ecc_size = chip->ecc.size;
int ecc_bytes = chip->ecc.bytes;
int ecc_steps = chip->ecc.steps;
@@ -2503,7 +2503,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
/* copy calculated ECC for whole page to chip->buffer->oob */
/* this include masked-value(0xFF) for unwritten subpages */
- ecc_calc = chip->buffers->ecccalc;
+ ecc_calc = chip->ecc.calc_buf;
ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
chip->ecc.total);
if (ret)
@@ -2737,9 +2737,9 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
if (part_pagewr)
bytes = min_t(int, bytes - column, writelen);
chip->pagebuf = -1;
- memset(chip->buffers->databuf, 0xff, mtd->writesize);
- memcpy(&chip->buffers->databuf[column], buf, bytes);
- wbuf = chip->buffers->databuf;
+ memset(chip->data_buf, 0xff, mtd->writesize);
+ memcpy(&chip->data_buf[column], buf, bytes);
+ wbuf = chip->data_buf;
}
if (unlikely(oob)) {
@@ -4632,7 +4632,6 @@ int nand_scan_tail(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct nand_ecc_ctrl *ecc = &chip->ecc;
- struct nand_buffers *nbuf = NULL;
int ret, i;
/* New bad blocks should be marked in OOB, flash-based BBT, or both */
@@ -4646,30 +4645,22 @@ int nand_scan_tail(struct mtd_info *mtd)
return -EINVAL;
}
- nbuf = kzalloc(sizeof(*nbuf), GFP_KERNEL);
- if (!nbuf)
+ ecc->calc_buf = kmalloc(mtd->oobsize, GFP_KERNEL);
+ if (!ecc->calc_buf)
return -ENOMEM;
- nbuf->ecccalc = kmalloc(mtd->oobsize, GFP_KERNEL);
- if (!nbuf->ecccalc) {
+ ecc->code_buf = kmalloc(mtd->oobsize, GFP_KERNEL);
+ if (!ecc->code_buf) {
ret = -ENOMEM;
- goto err_free_nbuf;
+ goto err_free_buf;
}
- nbuf->ecccode = kmalloc(mtd->oobsize, GFP_KERNEL);
- if (!nbuf->ecccode) {
+ chip->data_buf = kmalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
+ if (!chip->data_buf) {
ret = -ENOMEM;
- goto err_free_nbuf;
+ goto err_free_buf;
}
- nbuf->databuf = kmalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
- if (!nbuf->databuf) {
- ret = -ENOMEM;
- goto err_free_nbuf;
- }
-
- chip->buffers = nbuf;
-
/*
* FIXME: some NAND manufacturer drivers expect the first die to be
* selected when manufacturer->init() is called. They should be fixed
@@ -4680,10 +4671,10 @@ int nand_scan_tail(struct mtd_info *mtd)
ret = nand_manufacturer_init(chip);
chip->select_chip(mtd, -1);
if (ret)
- goto err_free_nbuf;
+ goto err_free_buf;
/* Set the internal oob buffer location, just after the page data */
- chip->oob_poi = chip->buffers->databuf + mtd->writesize;
+ chip->oob_poi = chip->data_buf + mtd->writesize;
/*
* If no default placement scheme is given, select an appropriate one.
@@ -4969,13 +4960,10 @@ int nand_scan_tail(struct mtd_info *mtd)
err_nand_manuf_cleanup:
nand_manufacturer_cleanup(chip);
-err_free_nbuf:
- if (nbuf) {
- kfree(nbuf->databuf);
- kfree(nbuf->ecccode);
- kfree(nbuf->ecccalc);
- kfree(nbuf);
- }
+err_free_buf:
+ kfree(chip->data_buf);
+ kfree(ecc->code_buf);
+ kfree(ecc->calc_buf);
return ret;
}
@@ -5027,12 +5015,9 @@ void nand_cleanup(struct nand_chip *chip)
/* Free bad block table memory */
kfree(chip->bbt);
- if (chip->buffers) {
- kfree(chip->buffers->databuf);
- kfree(chip->buffers->ecccode);
- kfree(chip->buffers->ecccalc);
- kfree(chip->buffers);
- }
+ kfree(chip->data_buf);
+ kfree(chip->ecc.code_buf);
+ kfree(chip->ecc.calc_buf);
/* Free bad block descriptor memory */
if (chip->badblock_pattern && chip->badblock_pattern->options
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 2915b67..3609285 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -898,7 +898,7 @@ static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *b
{
struct nand_chip *this = mtd_to_nand(mtd);
- return create_bbt(mtd, this->buffers->databuf, bd, -1);
+ return create_bbt(mtd, this->data_buf, bd, -1);
}
/**
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index dad438c..7870cb1 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1530,7 +1530,7 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int oob_required, int page)
{
int ret;
- uint8_t *ecc_calc = chip->buffers->ecccalc;
+ uint8_t *ecc_calc = chip->ecccalc;
/* Enable GPMC ecc engine */
chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1568,7 +1568,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
u32 data_len, const u8 *buf,
int oob_required, int page)
{
- u8 *ecc_calc = chip->buffers->ecccalc;
+ u8 *ecc_calc = chip->ecccalc;
int ecc_size = chip->ecc.size;
int ecc_bytes = chip->ecc.bytes;
int ecc_steps = chip->ecc.steps;
@@ -1605,7 +1605,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
/* copy calculated ECC for whole page to chip->buffer->oob */
/* this include masked-value(0xFF) for unwritten subpages */
- ecc_calc = chip->buffers->ecccalc;
+ ecc_calc = chip->ecccalc;
ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
chip->ecc.total);
if (ret)
@@ -1635,8 +1635,8 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
- uint8_t *ecc_calc = chip->buffers->ecccalc;
- uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_calc = chip->ecccalc;
+ uint8_t *ecc_code = chip->ecccode;
int stat, ret;
unsigned int max_bitflips = 0;
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 82244be..9fe5994 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -1544,7 +1544,7 @@ static int sunxi_nfc_hw_common_ecc_read_oob(struct mtd_info *mtd,
chip->pagebuf = -1;
- return chip->ecc.read_page(mtd, chip, chip->buffers->databuf, 1, page);
+ return chip->ecc.read_page(mtd, chip, chip->data_buf, 1, page);
}
static int sunxi_nfc_hw_common_ecc_write_oob(struct mtd_info *mtd,
@@ -1557,8 +1557,8 @@ static int sunxi_nfc_hw_common_ecc_write_oob(struct mtd_info *mtd,
chip->pagebuf = -1;
- memset(chip->buffers->databuf, 0xff, mtd->writesize);
- ret = chip->ecc.write_page(mtd, chip, chip->buffers->databuf, 1, page);
+ memset(chip->data_buf, 0xff, mtd->writesize);
+ ret = chip->ecc.write_page(mtd, chip, chip->data_buf, 1, page);
if (ret)
return ret;
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 5b24a8e..254f847 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -520,6 +520,8 @@ static const struct nand_ecc_caps __name = { \
* @postpad: padding information for syndrome based ECC generators
* @options: ECC specific options (see NAND_ECC_XXX flags defined above)
* @priv: pointer to private ECC control data
+ * @calc_buf: buffer for calculated ECC, size is oobsize.
+ * @code_buf: buffer for ECC read from flash, size is oobsize.
* @hwctl: function to control hardware ECC generator. Must only
* be provided if an hardware ECC is available
* @calculate: function for ECC calculation or readback from ECC hardware
@@ -570,6 +572,8 @@ struct nand_ecc_ctrl {
int postpad;
unsigned int options;
void *priv;
+ u8 *calc_buf;
+ u8 *code_buf;
void (*hwctl)(struct mtd_info *mtd, int mode);
int (*calculate)(struct mtd_info *mtd, const uint8_t *dat,
uint8_t *ecc_code);
@@ -603,21 +607,6 @@ static inline int nand_standard_page_accessors(struct nand_ecc_ctrl *ecc)
}
/**
- * struct nand_buffers - buffer structure for read/write
- * @ecccalc: buffer pointer for calculated ECC, size is oobsize.
- * @ecccode: buffer pointer for ECC read from flash, size is oobsize.
- * @databuf: buffer pointer for data, size is (page size + oobsize).
- *
- * Do not change the order of buffers. databuf and oobrbuf must be in
- * consecutive order.
- */
-struct nand_buffers {
- uint8_t *ecccalc;
- uint8_t *ecccode;
- uint8_t *databuf;
-};
-
-/**
* struct nand_sdr_timings - SDR NAND chip timings
*
* This struct defines the timing requirements of a SDR NAND chip.
@@ -785,7 +774,6 @@ struct nand_manufacturer_ops {
* @setup_read_retry: [FLASHSPECIFIC] flash (vendor) specific function for
* setting the read-retry mode. Mostly needed for MLC NAND.
* @ecc: [BOARDSPECIFIC] ECC control structure
- * @buffers: buffer structure for read/write
* @buf_align: minimum buffer alignment required by a platform
* @hwcontrol: platform-specific hardware control structure
* @erase: [REPLACEABLE] erase function
@@ -825,6 +813,7 @@ struct nand_manufacturer_ops {
* @numchips: [INTERN] number of physical chips
* @chipsize: [INTERN] the size of one chip for multichip arrays
* @pagemask: [INTERN] page number mask = number of (pages / chip) - 1
+ * @data_buf: [INTERN] buffer for data, size is (page size + oobsize).
* @pagebuf: [INTERN] holds the pagenumber which is currently in
* data_buf.
* @pagebuf_bitflips: [INTERN] holds the bitflip count for the page which is
@@ -903,6 +892,7 @@ struct nand_chip {
int numchips;
uint64_t chipsize;
int pagemask;
+ u8 *data_buf;
int pagebuf;
unsigned int pagebuf_bitflips;
int subpagesize;
@@ -933,7 +923,6 @@ struct nand_chip {
struct nand_hw_control *controller;
struct nand_ecc_ctrl ecc;
- struct nand_buffers *buffers;
unsigned long buf_align;
struct nand_hw_control hwcontrol;
--
2.7.4
On Tue, 5 Dec 2017 17:47:14 +0900
Masahiro Yamada <[email protected]> wrote:
> This driver is the last/only user of NAND_OWN_BUFFERS. Boris suggested
> to remove this flag.
>
> Taking a closer look at this driver, it calls dma_alloc_coherent() for
> the concatenated area for the DMA bounce buffer + struct nand_buffers,
> but the latter does not need to be DMA-coherent; cafe_{write,read}_buf
> simply do memcpy() between buffers when usedma==1.
>
> Let's do dma_alloc_coherent() for the DMA bounce buffer in the front,
> and leave the nand_buffers allocation to nand_scan_tail(), then rip off
> NAND_OWN_BUFFERS.
>
> The magic number, 2112, is still mysterious (hard-coded writesize +
> oobsize ?),
Yep, 2k pages usually have 64b of OOB, hence the 2112 magic number
(2048 + 64).
> but this is not our main interest. I am keeping it.
Agreed.
>
> Suggested-by: Boris Brezillon <[email protected]>
> Signed-off-by: Masahiro Yamada <[email protected]>
> ---
>
> Changes in v2:
> - Newly added
>
> drivers/mtd/nand/cafe_nand.c | 24 ++++--------------------
> 1 file changed, 4 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
> index bc558c4..add4613 100644
> --- a/drivers/mtd/nand/cafe_nand.c
> +++ b/drivers/mtd/nand/cafe_nand.c
> @@ -613,7 +613,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> uint32_t ctrl;
> int err = 0;
> int old_dma;
> - struct nand_buffers *nbuf;
>
> /* Very old versions shared the same PCI ident for all three
> functions on the chip. Verify the class too... */
> @@ -661,7 +660,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
>
> /* Enable the following for a flash based bad block table */
> cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
> - cafe->nand.options = NAND_OWN_BUFFERS;
>
> if (skipbbt) {
> cafe->nand.options |= NAND_SKIP_BBTSCAN;
> @@ -731,15 +729,12 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> if (err)
> goto out_irq;
>
> - cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - &cafe->dmaaddr, GFP_KERNEL);
> + cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
> + &cafe->dmaaddr, GFP_KERNEL);
> if (!cafe->dmabuf) {
> err = -ENOMEM;
> goto out_irq;
> }
> - cafe->nand.buffers = nbuf = (void *)cafe->dmabuf + 2112;
>
> /* Set up DMA address */
> cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
> @@ -752,11 +747,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
> cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
>
> - /* this driver does not need the @ecccalc and @ecccode */
> - nbuf->ecccalc = NULL;
> - nbuf->ecccode = NULL;
> - nbuf->databuf = (uint8_t *)(nbuf + 1);
> -
> /* Restore the DMA flag */
> usedma = old_dma;
>
> @@ -801,10 +791,7 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> goto out;
>
> out_free_dma:
> - dma_free_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - cafe->dmabuf, cafe->dmaaddr);
> + dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
> out_irq:
> /* Disable NAND IRQ in global IRQ mask register */
> cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
> @@ -829,10 +816,7 @@ static void cafe_nand_remove(struct pci_dev *pdev)
> nand_release(mtd);
> free_rs(cafe->rs);
> pci_iounmap(pdev, cafe->mmio);
> - dma_free_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - cafe->dmabuf, cafe->dmaaddr);
> + dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
> kfree(cafe);
> }
>
2017-12-05 17:47 GMT+09:00 Masahiro Yamada <[email protected]>:
> struct nand_buffers is malloc'ed in nand_scan_tail() just for
> containing three pointers. Squash this struct into nand_chip.
>
> Move and rename as follows:
>
> chip->buffers->ecccalc -> chip->ecc.calc_buf
> chip->buffers->ecccode -> chip->ecc.code_buf
> chip->buffers->databuf -> chip->data_buf
>
> Signed-off-by: Masahiro Yamada <[email protected]>
> ---
>
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index dad438c..7870cb1 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1530,7 +1530,7 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
> const uint8_t *buf, int oob_required, int page)
> {
> int ret;
> - uint8_t *ecc_calc = chip->buffers->ecccalc;
> + uint8_t *ecc_calc = chip->ecccalc;
>
> /* Enable GPMC ecc engine */
> chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
> @@ -1568,7 +1568,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
> u32 data_len, const u8 *buf,
> int oob_required, int page)
> {
> - u8 *ecc_calc = chip->buffers->ecccalc;
> + u8 *ecc_calc = chip->ecccalc;
> int ecc_size = chip->ecc.size;
> int ecc_bytes = chip->ecc.bytes;
> int ecc_steps = chip->ecc.steps;
> @@ -1605,7 +1605,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
>
> /* copy calculated ECC for whole page to chip->buffer->oob */
> /* this include masked-value(0xFF) for unwritten subpages */
> - ecc_calc = chip->buffers->ecccalc;
> + ecc_calc = chip->ecccalc;
> ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
> chip->ecc.total);
> if (ret)
> @@ -1635,8 +1635,8 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
> static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
> uint8_t *buf, int oob_required, int page)
> {
> - uint8_t *ecc_calc = chip->buffers->ecccalc;
> - uint8_t *ecc_code = chip->buffers->ecccode;
> + uint8_t *ecc_calc = chip->ecccalc;
> + uint8_t *ecc_code = chip->ecccode;
> int stat, ret;
> unsigned int max_bitflips = 0;
>
Sorry, I missed to update omap2.c
I will send v3.
On Tue, 5 Dec 2017 20:49:28 +0900
Masahiro Yamada <[email protected]> wrote:
> 2017-12-05 17:47 GMT+09:00 Masahiro Yamada <[email protected]>:
> > struct nand_buffers is malloc'ed in nand_scan_tail() just for
> > containing three pointers. Squash this struct into nand_chip.
> >
> > Move and rename as follows:
> >
> > chip->buffers->ecccalc -> chip->ecc.calc_buf
> > chip->buffers->ecccode -> chip->ecc.code_buf
> > chip->buffers->databuf -> chip->data_buf
> >
> > Signed-off-by: Masahiro Yamada <[email protected]>
> > ---
> >
>
>
>
>
> > diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> > index dad438c..7870cb1 100644
> > --- a/drivers/mtd/nand/omap2.c
> > +++ b/drivers/mtd/nand/omap2.c
> > @@ -1530,7 +1530,7 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
> > const uint8_t *buf, int oob_required, int page)
> > {
> > int ret;
> > - uint8_t *ecc_calc = chip->buffers->ecccalc;
> > + uint8_t *ecc_calc = chip->ecccalc;
> >
> > /* Enable GPMC ecc engine */
> > chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
> > @@ -1568,7 +1568,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
> > u32 data_len, const u8 *buf,
> > int oob_required, int page)
> > {
> > - u8 *ecc_calc = chip->buffers->ecccalc;
> > + u8 *ecc_calc = chip->ecccalc;
> > int ecc_size = chip->ecc.size;
> > int ecc_bytes = chip->ecc.bytes;
> > int ecc_steps = chip->ecc.steps;
> > @@ -1605,7 +1605,7 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
> >
> > /* copy calculated ECC for whole page to chip->buffer->oob */
> > /* this include masked-value(0xFF) for unwritten subpages */
> > - ecc_calc = chip->buffers->ecccalc;
> > + ecc_calc = chip->ecccalc;
> > ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
> > chip->ecc.total);
> > if (ret)
> > @@ -1635,8 +1635,8 @@ static int omap_write_subpage_bch(struct mtd_info *mtd,
> > static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
> > uint8_t *buf, int oob_required, int page)
> > {
> > - uint8_t *ecc_calc = chip->buffers->ecccalc;
> > - uint8_t *ecc_code = chip->buffers->ecccode;
> > + uint8_t *ecc_calc = chip->ecccalc;
> > + uint8_t *ecc_code = chip->ecccode;
> > int stat, ret;
> > unsigned int max_bitflips = 0;
> >
>
>
>
> Sorry, I missed to update omap2.c
>
> I will send v3.
No need to send a v3, I already fixed it when applying [1].
[1]https://github.com/bbrezillon/linux-0day/commit/59a7bfff7103d48713b2125c3844400301a3d028
Hi Boris,
2017-12-05 20:57 GMT+09:00 Boris Brezillon <[email protected]>:
>>
>>
>> Sorry, I missed to update omap2.c
>>
>> I will send v3.
>
> No need to send a v3, I already fixed it when applying [1].
>
> [1]https://github.com/bbrezillon/linux-0day/commit/59a7bfff7103d48713b2125c3844400301a3d028
>
Thank you for your kind help!
--
Best Regards
Masahiro Yamada
Hi Masahiro,
On Tue, 5 Dec 2017 21:28:55 +0900
Masahiro Yamada <[email protected]> wrote:
> Hi Boris,
>
> 2017-12-05 20:57 GMT+09:00 Boris Brezillon <[email protected]>:
> >>
> >>
> >> Sorry, I missed to update omap2.c
> >>
> >> I will send v3.
> >
> > No need to send a v3, I already fixed it when applying [1].
> >
> > [1]https://github.com/bbrezillon/linux-0day/commit/59a7bfff7103d48713b2125c3844400301a3d028
> >
>
> Thank you for your kind help!
>
>
No problem.
Thanks for working on improving the NAND framework, and if you're
looking for other things to cleanup in this area, I have a long TODO
list, so don't hesitate to ask. Just one example: I'd like to
dynamically allocate the onfi/jedec_params [1] struct instead of
embedding them in the nand_chip struct, because this increases the size
of the nand_chip object for everyone, even for those who don't have
ONFI/JEDEC compliant chips.
This should also allow us to get rid of the onfi/jedec_version fields
(if chip->onfi_params or chip->jedec_params are NULL, the NAND is not
ONFI or JEDEC compliant and the version has no meaning, if it's not
NULL, the version can be directly retrieved from the ->onfi/jedec_params
object itself).
Regards,
Boris
[1]http://elixir.free-electrons.com/linux/v4.15-rc2/source/include/linux/mtd/rawnand.h#L922
On Tue, 5 Dec 2017 17:47:14 +0900
Masahiro Yamada <[email protected]> wrote:
> This driver is the last/only user of NAND_OWN_BUFFERS. Boris suggested
> to remove this flag.
>
> Taking a closer look at this driver, it calls dma_alloc_coherent() for
> the concatenated area for the DMA bounce buffer + struct nand_buffers,
> but the latter does not need to be DMA-coherent; cafe_{write,read}_buf
> simply do memcpy() between buffers when usedma==1.
>
> Let's do dma_alloc_coherent() for the DMA bounce buffer in the front,
> and leave the nand_buffers allocation to nand_scan_tail(), then rip off
> NAND_OWN_BUFFERS.
>
> The magic number, 2112, is still mysterious (hard-coded writesize +
> oobsize ?), but this is not our main interest. I am keeping it.
>
> Suggested-by: Boris Brezillon <[email protected]>
> Signed-off-by: Masahiro Yamada <[email protected]>
Applied the whole series.
Thanks,
Boris
> ---
>
> Changes in v2:
> - Newly added
>
> drivers/mtd/nand/cafe_nand.c | 24 ++++--------------------
> 1 file changed, 4 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
> index bc558c4..add4613 100644
> --- a/drivers/mtd/nand/cafe_nand.c
> +++ b/drivers/mtd/nand/cafe_nand.c
> @@ -613,7 +613,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> uint32_t ctrl;
> int err = 0;
> int old_dma;
> - struct nand_buffers *nbuf;
>
> /* Very old versions shared the same PCI ident for all three
> functions on the chip. Verify the class too... */
> @@ -661,7 +660,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
>
> /* Enable the following for a flash based bad block table */
> cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
> - cafe->nand.options = NAND_OWN_BUFFERS;
>
> if (skipbbt) {
> cafe->nand.options |= NAND_SKIP_BBTSCAN;
> @@ -731,15 +729,12 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> if (err)
> goto out_irq;
>
> - cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - &cafe->dmaaddr, GFP_KERNEL);
> + cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
> + &cafe->dmaaddr, GFP_KERNEL);
> if (!cafe->dmabuf) {
> err = -ENOMEM;
> goto out_irq;
> }
> - cafe->nand.buffers = nbuf = (void *)cafe->dmabuf + 2112;
>
> /* Set up DMA address */
> cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
> @@ -752,11 +747,6 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
> cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
>
> - /* this driver does not need the @ecccalc and @ecccode */
> - nbuf->ecccalc = NULL;
> - nbuf->ecccode = NULL;
> - nbuf->databuf = (uint8_t *)(nbuf + 1);
> -
> /* Restore the DMA flag */
> usedma = old_dma;
>
> @@ -801,10 +791,7 @@ static int cafe_nand_probe(struct pci_dev *pdev,
> goto out;
>
> out_free_dma:
> - dma_free_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - cafe->dmabuf, cafe->dmaaddr);
> + dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
> out_irq:
> /* Disable NAND IRQ in global IRQ mask register */
> cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
> @@ -829,10 +816,7 @@ static void cafe_nand_remove(struct pci_dev *pdev)
> nand_release(mtd);
> free_rs(cafe->rs);
> pci_iounmap(pdev, cafe->mmio);
> - dma_free_coherent(&cafe->pdev->dev,
> - 2112 + sizeof(struct nand_buffers) +
> - mtd->writesize + mtd->oobsize,
> - cafe->dmabuf, cafe->dmaaddr);
> + dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
> kfree(cafe);
> }
>