From patchwork Sat Aug 11 15:50:31 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huang Shijie X-Patchwork-Id: 1307671 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 07C25DF27F for ; Sat, 11 Aug 2012 03:53:27 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T02i0-0004NC-Lw; Sat, 11 Aug 2012 03:49:52 +0000 Received: from mail-pb0-f49.google.com ([209.85.160.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T02ht-0004Me-U6; Sat, 11 Aug 2012 03:49:46 +0000 Received: by pbbrq8 with SMTP id rq8so2431398pbb.36 for ; Fri, 10 Aug 2012 20:49:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer; bh=zLEal5r0YbrtqUbsgnETB6C3VTH2muDaqr0NrGFQthA=; b=dSOY8e+cZ3g3BRm/pvlFankrJfzRwgj3vn75HZpnX6j27JUDg8Wh1mytIfr5ikes5a Z3vjHlY7jGa7zJbVrK4xyICDzGrKeadW10NFmxOX6Vc9rD0Dm0JYLXrWtXydW46DM/R+ wwE8UBBkuAgIsWQNXZGtgDFUFWXgUmdjyxmlhNw703KOpv19TzubMddiZLC4fGz9/lz2 QiDKVBt5NrKjNOvQmuEguSBKgvqKPwbAnZuqDrYdoulAvjDvAWFw3TMngjXwWQ1IzugP 6UCXQ7krm4+nj65vfs7fhWCjG+98/n0LFVk1WBI/NQwcJPrbjZON5rlh/eCMTlZ53CEt RH3Q== Received: by 10.68.221.72 with SMTP id qc8mr2595637pbc.63.1344656984207; Fri, 10 Aug 2012 20:49:44 -0700 (PDT) Received: from localhost.localdomain.Home ([180.155.110.28]) by mx.google.com with ESMTPS id gv1sm557777pbc.38.2012.08.10.20.49.39 (version=SSLv3 cipher=OTHER); Fri, 10 Aug 2012 20:49:43 -0700 (PDT) From: Huang Shijie To: dwmw2@infradead.org Subject: [PATCH v3] mtd: gpmi: add NAND write verify support Date: Sat, 11 Aug 2012 11:50:31 -0400 Message-Id: <1344700231-12624-1-git-send-email-shijie8@gmail.com> X-Mailer: git-send-email 1.7.4.4 X-Spam-Note: CRM114 invocation failed X-Spam-Score: 0.7 (/) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.160.49 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (shijie8[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 3.2 DATE_IN_FUTURE_12_24 Date: is 12 to 24 hours after Received: date 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (shijie8[at]gmail.com) -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature Cc: marex@denx.de, fabio.estevam@freescale.com, dedekind1@gmail.com, stable@vger.kernel.org, linux-mtd@lists.infradead.org, shawn.guo@linaro.org, Huang Shijie , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add NAND write verify support in gpmi-nand driver. This patch fixes a kernel crash when we select CONFIG_MTD_NAND_VERIFY_WRITE=y, and do some write tests: root@freescale /$ dd if=/dev/zero of=/dev/mtd0 bs=128k count=1 [ 41.070000] Unable to handle kernel NULL pointer dereference at virtual addr0 [ 41.080000] pgd = c77ac000 [ 41.080000] [00000000] *pgd=4773c831, *pte=00000000, *ppte=00000000 [ 41.090000] Internal error: Oops: 17 [#1] ARM [ 41.090000] Modules linked in: [ 41.090000] CPU: 0 Not tainted (3.6.0-rc1-next-20120809-00002-ga25d017-d) [ 41.090000] PC is at nand_verify_buf+0x18/0x5c [ 41.090000] LR is at nand_write_page+0xc0/0x140 [ 41.090000] pc : [] lr : [] psr: 20000013 [ 41.090000] sp : c7779de4 ip : 00000000 fp : c6e60000 [ 41.090000] r10: 00000000 r9 : 00020000 r8 : 00000000 [ 41.090000] r7 : 00000000 r6 : c6e60000 r5 : c762cb10 r4 : 00000000 [ 41.090000] r3 : c762c8a8 r2 : 00000800 r1 : c6e60000 r0 : 00000000 [ 41.090000] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 41.090000] Control: 0005317f Table: 477ac000 DAC: 00000015 [ 41.090000] Process dd (pid: 427, stack limit = 0xc7778270) [ 41.090000] Stack: (0xc7779de4 to 0xc777a000) ... Cc: Signed-off-by: Huang Shijie --- v2 --> v3: [1] free the verify_buf when we exit. v1 --> v2: [1] use the mtd->writesize to allocate the verify buffer. [2] add new field `verify_buf` in gpmi_nand_data{} tested this patch on imx6q-arm2 board. --- drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 25 +++++++++++++++++++++++++ drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 1 + 2 files changed, 26 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c index 8c0d2f0..e1e4c51 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c @@ -1512,12 +1512,34 @@ static int gpmi_pre_bbt_scan(struct gpmi_nand_data *this) return nand_boot_init(this); } +static int gpmi_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len) +{ + struct nand_chip *chip = mtd->priv; + struct gpmi_nand_data *this = chip->priv; + int ret; + + ret = chip->ecc.read_page(mtd, chip, this->verify_buf, 0, 0); + if (ret) + return -EFAULT; + if (memcmp(buf, this->verify_buf, len)) + return -EFAULT; + return 0; +} + static int gpmi_scan_bbt(struct mtd_info *mtd) { struct nand_chip *chip = mtd->priv; struct gpmi_nand_data *this = chip->priv; int ret; + /* + * We have gotten the right page size now, use it to allocate + * the proper verify buffer. + */ + this->verify_buf = kzalloc(mtd->writesize, GFP_KERNEL); + if (!this->verify_buf) + return -ENOMEM; + /* Prepare for the BBT scan. */ ret = gpmi_pre_bbt_scan(this); if (ret) @@ -1531,6 +1553,8 @@ void gpmi_nfc_exit(struct gpmi_nand_data *this) { nand_release(&this->mtd); gpmi_free_dma_buffer(this); + kfree(this->verify_buf); + this->verify_buf = NULL; } static int __devinit gpmi_nfc_init(struct gpmi_nand_data *this) @@ -1556,6 +1580,7 @@ static int __devinit gpmi_nfc_init(struct gpmi_nand_data *this) chip->read_byte = gpmi_read_byte; chip->read_buf = gpmi_read_buf; chip->write_buf = gpmi_write_buf; + chip->verify_buf = gpmi_verify_buf; chip->ecc.read_page = gpmi_ecc_read_page; chip->ecc.write_page = gpmi_ecc_write_page; chip->ecc.read_oob = gpmi_ecc_read_oob; diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h index 1547a60..8ddf115 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h @@ -144,6 +144,7 @@ struct gpmi_nand_data { /* MTD / NAND */ struct nand_chip nand; struct mtd_info mtd; + uint8_t *verify_buf; /* General-use Variables */ int current_chip;