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[xburst] Improve mounttime

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This patchset optimizes nand read access and reduces the ubi attach time by ~2/3
Credits go to dvdk for having the idea.
This commit is contained in:
Xiangfu Liu 2011-04-26 11:16:09 +08:00 committed by kyak
parent 463d311b40
commit 06082c3b5a
4 changed files with 218 additions and 0 deletions
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11
target/linux/xburst/patches-2.6.37/901-ubi-Read-only-the-vid-header-instead-of-the-whole-pa.patch Normal file
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@ -0,0 +1,11 @@
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -995,7 +995,7 @@ int ubi_io_read_vid_hdr(struct ubi_devic
p = (char *)vid_hdr - ubi->vid_hdr_shift;
read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
- ubi->vid_hdr_alsize);
+ UBI_VID_HDR_SIZE + ubi->vid_hdr_shift);
if (read_err && read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
return read_err;

30
target/linux/xburst/patches-2.6.37/902-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch Normal file
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@ -0,0 +1,30 @@
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1313,9 +1313,15 @@ static int nand_read_page_hwecc_oob_firs
uint8_t *ecc_calc = chip->buffers->ecccalc;
/* Read the OOB area first */
- chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
- chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
- chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+ if (mtd->writesize > 512) {
+ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
+ } else {
+ chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+ }
for (i = 0; i < chip->ecc.total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
@@ -1485,7 +1491,7 @@ static int nand_do_read_ops(struct mtd_i
if (realpage != chip->pagebuf || oob) {
bufpoi = aligned ? buf : chip->buffers->databuf;
- if (likely(sndcmd)) {
+ if (likely(sndcmd) && chip->ecc.mode != NAND_ECC_HW_OOB_FIRST) {
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
sndcmd = 0;
}

133
target/linux/xburst/patches-2.6.37/903-NAND-Add-support-for-subpage-reads-for-NAND_ECC_HW_O.patch Normal file
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@ -0,0 +1,133 @@
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1164,7 +1164,7 @@ static int nand_read_page_swecc(struct m
* @bufpoi: buffer to store read data
*/
static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
- uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi)
+ uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi, int page)
{
int start_step, end_step, num_steps;
uint32_t *eccpos = chip->ecc.layout->eccpos;
@@ -1342,6 +1342,75 @@ static int nand_read_page_hwecc_oob_firs
return 0;
}
+ /**
+ * nand_read_subpage_hwecc_oob_first - [REPLACABLE] hw ecc based sub-page read function
+ * @mtd: mtd info structure
+ * @chip: nand chip info structure
+ * @data_offs: offset of requested data within the page
+ * @readlen: data length
+ * @bufpoi: buffer to store read data
+ * @page: page number to read
+ *
+ * Hardware ECC for large page chips, require OOB to be read first.
+ * For this ECC mode, the write_page method is re-used from ECC_HW.
+ * These methods read/write ECC from the OOB area, unlike the
+ * ECC_HW_SYNDROME support with multiple ECC steps, follows the
+ * "infix ECC" scheme and reads/writes ECC from the data area, by
+ * overwriting the NAND manufacturer bad block markings.
+ */
+static int nand_read_subpage_hwecc_oob_first(struct mtd_info *mtd, struct nand_chip *chip,
+ uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi, int page)
+{
+ int start_step, end_step, num_steps;
+ uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint8_t *p;
+ int data_col_addr;
+ int eccsize = chip->ecc.size;
+ int eccbytes = chip->ecc.bytes;
+ uint8_t *ecc_code = chip->buffers->ecccode;
+ uint8_t *ecc_calc = chip->buffers->ecccalc;
+ int i;
+
+ /* Column address wihin the page aligned to ECC size */
+ start_step = data_offs / chip->ecc.size;
+ end_step = (data_offs + readlen - 1) / chip->ecc.size;
+ num_steps = end_step - start_step + 1;
+
+ data_col_addr = start_step * chip->ecc.size;
+
+ /* Read the OOB area first */
+ if (mtd->writesize > 512) {
+ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
+ } else {
+ chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_READ0, data_col_addr, page);
+ }
+
+ for (i = 0; i < chip->ecc.total; i++)
+ ecc_code[i] = chip->oob_poi[eccpos[i]];
+
+ p = bufpoi + data_col_addr;
+
+ for (i = eccbytes * start_step; num_steps; num_steps--, i += eccbytes, p += eccsize) {
+ int stat;
+
+ chip->ecc.hwctl(mtd, NAND_ECC_READ);
+ chip->read_buf(mtd, p, eccsize);
+ chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+
+ stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL);
+ if (stat < 0)
+ mtd->ecc_stats.failed++;
+ else
+ mtd->ecc_stats.corrected += stat;
+ }
+
+ return 0;
+}
+
/**
* nand_read_page_syndrome - [REPLACABLE] hardware ecc syndrom based page read
* @mtd: mtd info structure
@@ -1502,7 +1571,7 @@ static int nand_do_read_ops(struct mtd_i
bufpoi, page);
else if (!aligned && NAND_SUBPAGE_READ(chip) && !oob)
ret = chip->ecc.read_subpage(mtd, chip,
- col, bytes, bufpoi);
+ col, bytes, bufpoi, page);
else
ret = chip->ecc.read_page(mtd, chip, bufpoi,
page);
@@ -3288,8 +3357,11 @@ int nand_scan_tail(struct mtd_info *mtd)
"Hardware ECC not possible\n");
BUG();
}
- if (!chip->ecc.read_page)
+ if (!chip->ecc.read_page) {
chip->ecc.read_page = nand_read_page_hwecc_oob_first;
+ if (!chip->ecc.read_subpage)
+ chip->ecc.read_subpage = nand_read_subpage_hwecc_oob_first;
+ }
case NAND_ECC_HW:
/* Use standard hwecc read page function ? */
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -210,9 +210,9 @@ typedef enum {
#define NAND_MUST_PAD(chip) (!(chip->options & NAND_NO_PADDING))
#define NAND_HAS_CACHEPROG(chip) ((chip->options & NAND_CACHEPRG))
#define NAND_HAS_COPYBACK(chip) ((chip->options & NAND_COPYBACK))
-/* Large page NAND with SOFT_ECC should support subpage reads */
-#define NAND_SUBPAGE_READ(chip) ((chip->ecc.mode == NAND_ECC_SOFT) \
- && (chip->page_shift > 9))
+/* Large page NAND with read_subpage should support subpage reads */
+#define NAND_SUBPAGE_READ(chip) (((chip)->ecc.read_subpage) \
+ && ((chip)->page_shift > 9))
/* Mask to zero out the chip options, which come from the id table */
#define NAND_CHIPOPTIONS_MSK (0x0000ffff & ~NAND_NO_AUTOINCR)
@@ -374,7 +374,7 @@ struct nand_ecc_ctrl {
int (*read_page)(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int page);
int (*read_subpage)(struct mtd_info *mtd, struct nand_chip *chip,
- uint32_t offs, uint32_t len, uint8_t *buf);
+ uint32_t offs, uint32_t len, uint8_t *buf, int page);
void (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf);
int (*read_oob)(struct mtd_info *mtd, struct nand_chip *chip, int page,

44
target/linux/xburst/patches-2.6.37/904-NAND-Optimize-reading-the-eec-data-for-the-JZ4740-ev.patch Normal file
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@ -0,0 +1,44 @@
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1314,8 +1314,8 @@ static int nand_read_page_hwecc_oob_firs
/* Read the OOB area first */
if (mtd->writesize > 512) {
- chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
- chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize + eccpos[0], page);
+ chip->read_buf(mtd, ecc_code, chip->ecc.total);
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
@@ -1323,9 +1323,6 @@ static int nand_read_page_hwecc_oob_firs
chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
}
- for (i = 0; i < chip->ecc.total; i++)
- ecc_code[i] = chip->oob_poi[eccpos[i]];
-
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
@@ -1380,8 +1377,8 @@ static int nand_read_subpage_hwecc_oob_f
/* Read the OOB area first */
if (mtd->writesize > 512) {
- chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
- chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize + eccpos[0], page);
+ chip->read_buf(mtd, ecc_code, chip->ecc.total);
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
@@ -1389,9 +1386,6 @@ static int nand_read_subpage_hwecc_oob_f
chip->cmdfunc(mtd, NAND_CMD_READ0, data_col_addr, page);
}
- for (i = 0; i < chip->ecc.total; i++)
- ecc_code[i] = chip->oob_poi[eccpos[i]];
-
p = bufpoi + data_col_addr;
for (i = eccbytes * start_step; num_steps; num_steps--, i += eccbytes, p += eccsize) {