From patchwork Wed May 25 21:57:30 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Per Forlin X-Patchwork-Id: 819102 Received: from canuck.infradead.org (canuck.infradead.org [134.117.69.58]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p4Q1fIt6021407 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 26 May 2011 01:41:44 GMT Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1QPN0E-0000m0-Kv; Wed, 25 May 2011 22:56:34 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QPMye-0000Sh-Q4 for linux-arm-kernel@canuck.infradead.org; Wed, 25 May 2011 22:54:56 +0000 Received: from mail-ey0-f177.google.com ([209.85.215.177]) by casper.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QPMAG-0004mN-Du for linux-arm-kernel@lists.infradead.org; Wed, 25 May 2011 22:02:53 +0000 Received: by eyh6 with SMTP id 6so109561eyh.36 for ; Wed, 25 May 2011 14:58:37 -0700 (PDT) Received: by 10.14.47.131 with SMTP id t3mr27537eeb.205.1306360716790; Wed, 25 May 2011 14:58:36 -0700 (PDT) Received: from localhost.localdomain (c-3c7b71d5.029-82-6c756e10.cust.bredbandsbolaget.se [213.113.123.60]) by mx.google.com with ESMTPS id y6sm66959eem.18.2011.05.25.14.58.35 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 25 May 2011 14:58:36 -0700 (PDT) From: Per Forlin To: linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linaro-dev@lists.linaro.org, David Vrabel Subject: [PATCH v4 09/12] mmc: move error code in mmc_block_issue_rw_rq to a separate function. Date: Wed, 25 May 2011 23:57:30 +0200 Message-Id: <1306360653-6196-10-git-send-email-per.forlin@linaro.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1306360653-6196-1-git-send-email-per.forlin@linaro.org> References: <1306360653-6196-1-git-send-email-per.forlin@linaro.org> X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110525_230252_533277_17CCC628 X-CRM114-Status: GOOD ( 22.47 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2-r929478 on casper.infradead.org summary: Content analysis details: (-2.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.215.177 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Chris Ball , Per Forlin X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.12 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 X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 26 May 2011 01:41:44 +0000 (UTC) Break out code without functional changes. This simplifies the code and makes way for handle two parallel request. Signed-off-by: Per Forlin --- drivers/mmc/card/block.c | 226 +++++++++++++++++++++++++++------------------- 1 files changed, 132 insertions(+), 94 deletions(-) diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index aead2d1..1c0b077 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -79,6 +79,13 @@ struct mmc_blk_data { static DEFINE_MUTEX(open_lock); +enum mmc_blk_status { + MMC_BLK_SUCCESS = 0, + MMC_BLK_RETRY, + MMC_BLK_DATA_ERR, + MMC_BLK_CMD_ERR, +}; + module_param(perdev_minors, int, 0444); MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); @@ -324,6 +331,102 @@ out: return err ? 0 : 1; } +static enum mmc_blk_status mmc_blk_err_check(struct mmc_blk_request *brq, + struct request *req, + struct mmc_card *card, + struct mmc_blk_data *md) +{ + struct mmc_command cmd; + u32 status = 0; + enum mmc_blk_status ret = MMC_BLK_SUCCESS; + + /* + * Check for errors here, but don't jump to cmd_err + * until later as we need to wait for the card to leave + * programming mode even when things go wrong. + */ + if (brq->cmd.error || brq->data.error || brq->stop.error) { + if (brq->data.blocks > 1 && rq_data_dir(req) == READ) { + /* Redo read one sector at a time */ + printk(KERN_WARNING "%s: retrying using single " + "block read, brq %p\n", + req->rq_disk->disk_name, brq); + ret = MMC_BLK_RETRY; + goto out; + } + status = get_card_status(card, req); + } + + if (brq->cmd.error) { + printk(KERN_ERR "%s: error %d sending read/write " + "command, response %#x, card status %#x\n", + req->rq_disk->disk_name, brq->cmd.error, + brq->cmd.resp[0], status); + } + + if (brq->data.error) { + if (brq->data.error == -ETIMEDOUT && brq->mrq.stop) + /* 'Stop' response contains card status */ + status = brq->mrq.stop->resp[0]; + printk(KERN_ERR "%s: error %d transferring data," + " sector %u, nr %u, card status %#x\n", + req->rq_disk->disk_name, brq->data.error, + (unsigned)blk_rq_pos(req), + (unsigned)blk_rq_sectors(req), status); + } + + if (brq->stop.error) { + printk(KERN_ERR "%s: error %d sending stop command, " + "response %#x, card status %#x\n", + req->rq_disk->disk_name, brq->stop.error, + brq->stop.resp[0], status); + } + + if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { + do { + int err; + + cmd.opcode = MMC_SEND_STATUS; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + err = mmc_wait_for_cmd(card->host, &cmd, 5); + if (err) { + printk(KERN_ERR "%s: error %d requesting status\n", + req->rq_disk->disk_name, err); + ret = MMC_BLK_CMD_ERR; + goto out; + } + /* + * Some cards mishandle the status bits, + * so make sure to check both the busy + * indication and the card state. + */ + } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || + (R1_CURRENT_STATE(cmd.resp[0]) == 7)); + +#if 0 + if (cmd.resp[0] & ~0x00000900) + printk(KERN_ERR "%s: status = %08x\n", + req->rq_disk->disk_name, cmd.resp[0]); + if (mmc_decode_status(cmd.resp)) { + ret = MMC_BLK_CMD_ERR; + goto out; + } + +#endif + } + + if (brq->cmd.error || brq->stop.error || brq->data.error) { + if (rq_data_dir(req) == READ) + ret = MMC_BLK_DATA_ERR; + else + ret = MMC_BLK_CMD_ERR; + } + out: + return ret; + +} + static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, struct mmc_card *card, int disable_multi, @@ -419,111 +522,46 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req) struct mmc_card *card = md->queue.card; struct mmc_blk_request *brq = &mq->mqrq_cur->brq; int ret = 1, disable_multi = 0; + enum mmc_blk_status status; mmc_claim_host(card->host); do { - struct mmc_command cmd; - u32 status = 0; - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, disable_multi, mq); mmc_wait_for_req(card->host, &brq->mrq); mmc_queue_bounce_post(mq->mqrq_cur); + status = mmc_blk_err_check(brq, req, card, md); - /* - * Check for errors here, but don't jump to cmd_err - * until later as we need to wait for the card to leave - * programming mode even when things go wrong. - */ - if (brq->cmd.error || brq->data.error || brq->stop.error) { - if (brq->data.blocks > 1 && rq_data_dir(req) == READ) { - /* Redo read one sector at a time */ - printk(KERN_WARNING "%s: retrying using single " - "block read\n", req->rq_disk->disk_name); - disable_multi = 1; - continue; - } - status = get_card_status(card, req); - } - - if (brq->cmd.error) { - printk(KERN_ERR "%s: error %d sending read/write " - "command, response %#x, card status %#x\n", - req->rq_disk->disk_name, brq->cmd.error, - brq->cmd.resp[0], status); - } - - if (brq->data.error) { - if (brq->data.error == -ETIMEDOUT && brq->mrq.stop) - /* 'Stop' response contains card status */ - status = brq->mrq.stop->resp[0]; - printk(KERN_ERR "%s: error %d transferring data," - " sector %u, nr %u, card status %#x\n", - req->rq_disk->disk_name, brq->data.error, - (unsigned)blk_rq_pos(req), - (unsigned)blk_rq_sectors(req), status); - } - - if (brq->stop.error) { - printk(KERN_ERR "%s: error %d sending stop command, " - "response %#x, card status %#x\n", - req->rq_disk->disk_name, brq->stop.error, - brq->stop.resp[0], status); - } - - if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { - do { - int err; - - cmd.opcode = MMC_SEND_STATUS; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - err = mmc_wait_for_cmd(card->host, &cmd, 5); - if (err) { - printk(KERN_ERR "%s: error %d requesting status\n", - req->rq_disk->disk_name, err); - goto cmd_err; - } - /* - * Some cards mishandle the status bits, - * so make sure to check both the busy - * indication and the card state. - */ - } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || - (R1_CURRENT_STATE(cmd.resp[0]) == 7)); - -#if 0 - if (cmd.resp[0] & ~0x00000900) - printk(KERN_ERR "%s: status = %08x\n", - req->rq_disk->disk_name, cmd.resp[0]); - if (mmc_decode_status(cmd.resp)) - goto cmd_err; -#endif - } - - if (brq->cmd.error || brq->stop.error || brq->data.error) { - if (rq_data_dir(req) == READ) { - /* - * After an error, we redo I/O one sector at a - * time, so we only reach here after trying to - * read a single sector. - */ - spin_lock_irq(&md->lock); - ret = __blk_end_request(req, -EIO, - brq->data.blksz); - spin_unlock_irq(&md->lock); - continue; - } + switch (status) { + case MMC_BLK_CMD_ERR: goto cmd_err; - } + break; + case MMC_BLK_RETRY: + disable_multi = 1; + ret = 1; + break; + case MMC_BLK_DATA_ERR: + /* + * After an error, we redo I/O one sector at a + * time, so we only reach here after trying to + * read a single sector. + */ + spin_lock_irq(&md->lock); + ret = __blk_end_request(req, -EIO, + brq->data.blksz); + spin_unlock_irq(&md->lock); - /* - * A block was successfully transferred. - */ - spin_lock_irq(&md->lock); - ret = __blk_end_request(req, 0, brq->data.bytes_xfered); - spin_unlock_irq(&md->lock); + break; + case MMC_BLK_SUCCESS: + /* + * A block was successfully transferred. + */ + spin_lock_irq(&md->lock); + ret = __blk_end_request(req, 0, brq->data.bytes_xfered); + spin_unlock_irq(&md->lock); + break; + } } while (ret); mmc_release_host(card->host);