Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753286AbZCCGhS (ORCPT ); Tue, 3 Mar 2009 01:37:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756877AbZCCGg7 (ORCPT ); Tue, 3 Mar 2009 01:36:59 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:35452 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752182AbZCCGg5 (ORCPT ); Tue, 3 Mar 2009 01:36:57 -0500 Date: Tue, 03 Mar 2009 15:36:18 +0900 From: Kyungmin Park Subject: [PATCH 2/3] [MTD] [OneNAND] Add write-while-program support To: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Cc: ext-adrian.hunter@nokia.com Message-id: <20090303063618.GA30263@july> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-disposition: inline User-Agent: Mutt/1.5.14 (2007-02-12) X-OriginalArrivalTime: 03 Mar 2009 06:36:24.0596 (UTC) FILETIME=[5F935540:01C99BCA] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7668 Lines: 250 It's similar with read-while-program method. but it's write side performance improvement. Here's brief performance results. Note: Measured from OMAP3 with async OneNAND mode. (not sync mode) ================================================================= speedtest: dev = 3 speedtest: Size=16777216 EB size=131072 Write size=2048 EB count=128 Pages per EB=64 Page size=2048 speedtest: scanning for bad blocks speedtest: scanned 0 speedtest: scanned 128, found 0 bad speedtest: erasing speedtest: erased 0 speedtest: erased 128 speedtest: Testing eraseblock write speed eraseblock write speed is 2592 KiB/s speedtest: Testing eraseblock read speed eraseblock read speed is 16786 KiB/s speedtest: Testing page write speed page write speed is 2966 KiB/s speedtest: Testing page read speed page read speed is 13277 KiB/s speedtest: Testing 2 page write speed 2 page write speed is 3182 KiB/s speedtest: Testing 2 page read speed 2 page read speed is 14773 KiB/s speedtest: Testing erase speed erase speed is 192752 KiB/s speedtest: speedtest finished ================================================================= Also it's passed all nand-tests. >From Adrian I have made a couple of tiny changes and tested this. I get a 10% - 25% improvement in write speed when writing more than 1 page. Signed-off-by: Kyungmin Park Signed-off-by: Adrian Hunter --- drivers/mtd/onenand/onenand_base.c | 145 ++++++++++++++++++++++++------------ 1 files changed, 96 insertions(+), 49 deletions(-) diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 4481df7..7af863a 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -1778,7 +1778,8 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) { struct onenand_chip *this = mtd->priv; - int written = 0, column, thislen, subpage; + int written = 0, column, thislen = 0, subpage = 0; + int prev = 0, prevlen = 0, prev_subpage = 0, first = 1; int oobwritten = 0, oobcolumn, thisooblen, oobsize; size_t len = ops->len; size_t ooblen = ops->ooblen; @@ -1805,6 +1806,10 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, return -EINVAL; } + /* Check zero length */ + if (!len) + return 0; + if (ops->mode == MTD_OOB_AUTO) oobsize = this->ecclayout->oobavail; else @@ -1815,79 +1820,121 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, column = to & (mtd->writesize - 1); /* Loop until all data write */ - while (written < len) { - u_char *wbuf = (u_char *) buf; + while (1) { + if (written < len) { + u_char *wbuf = (u_char *) buf; - thislen = min_t(int, mtd->writesize - column, len - written); - thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten); + thislen = min_t(int, mtd->writesize - column, len - written); + thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten); - cond_resched(); + cond_resched(); - this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen); + this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen); - /* Partial page write */ - subpage = thislen < mtd->writesize; - if (subpage) { - memset(this->page_buf, 0xff, mtd->writesize); - memcpy(this->page_buf + column, buf, thislen); - wbuf = this->page_buf; - } + /* Partial page write */ + subpage = thislen < mtd->writesize; + if (subpage) { + memset(this->page_buf, 0xff, mtd->writesize); + memcpy(this->page_buf + column, buf, thislen); + wbuf = this->page_buf; + } - this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize); + this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize); - if (oob) { - oobbuf = this->oob_buf; + if (oob) { + oobbuf = this->oob_buf; - /* We send data to spare ram with oobsize - * to prevent byte access */ - memset(oobbuf, 0xff, mtd->oobsize); - if (ops->mode == MTD_OOB_AUTO) - onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen); - else - memcpy(oobbuf + oobcolumn, oob, thisooblen); + /* We send data to spare ram with oobsize + * to prevent byte access */ + memset(oobbuf, 0xff, mtd->oobsize); + if (ops->mode == MTD_OOB_AUTO) + onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen); + else + memcpy(oobbuf + oobcolumn, oob, thisooblen); - oobwritten += thisooblen; - oob += thisooblen; - oobcolumn = 0; + oobwritten += thisooblen; + oob += thisooblen; + oobcolumn = 0; + } else + oobbuf = (u_char *) ffchars; + + this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize); } else - oobbuf = (u_char *) ffchars; + ONENAND_SET_NEXT_BUFFERRAM(this); - this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize); + /* + * 2 PLANE, MLC, and Flex-OneNAND doesn't support + * write-while-programe feature. + */ + if (!ONENAND_IS_2PLANE(this) && !first) { + ONENAND_SET_PREV_BUFFERRAM(this); - this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize); + ret = this->wait(mtd, FL_WRITING); - ret = this->wait(mtd, FL_WRITING); + /* In partial page write we don't update bufferram */ + onenand_update_bufferram(mtd, prev, !ret && !prev_subpage); + if (ret) { + written -= prevlen; + printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret); + break; + } - /* In partial page write we don't update bufferram */ - onenand_update_bufferram(mtd, to, !ret && !subpage); - if (ONENAND_IS_2PLANE(this)) { - ONENAND_SET_BUFFERRAM1(this); - onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage); - } + if (written == len) { + /* Only check verify write turn on */ + ret = onenand_verify(mtd, buf - len, to - len, len); + if (ret) + printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret); + break; + } - if (ret) { - printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret); - break; + ONENAND_SET_NEXT_BUFFERRAM(this); } - /* Only check verify write turn on */ - ret = onenand_verify(mtd, buf, to, thislen); - if (ret) { - printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret); - break; - } + this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize); - written += thislen; + /* + * 2 PLANE, MLC, and Flex-OneNAND wait here + */ + if (ONENAND_IS_2PLANE(this)) { + ret = this->wait(mtd, FL_WRITING); - if (written == len) - break; + /* In partial page write we don't update bufferram */ + onenand_update_bufferram(mtd, to, !ret && !subpage); + if (ret) { + printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret); + break; + } + + /* Only check verify write turn on */ + ret = onenand_verify(mtd, buf, to, thislen); + if (ret) { + printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret); + break; + } + + written += thislen; + + if (written == len) + break; + + } else + written += thislen; column = 0; + prev_subpage = subpage; + prev = to; + prevlen = thislen; to += thislen; buf += thislen; + first = 0; } + /* In error case, clear all bufferrams */ + if (written != len) + onenand_invalidate_bufferram(mtd, 0, -1); + ops->retlen = written; + ops->oobretlen = oobwritten; return ret; } -- 1.5.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/