From patchwork Tue Dec 11 13:06:32 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 13472 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 5097123E1A for ; Tue, 11 Dec 2012 13:29:25 +0000 (UTC) Received: from mail-ie0-f180.google.com (mail-ie0-f180.google.com [209.85.223.180]) by fiordland.canonical.com (Postfix) with ESMTP id D2459A19343 for ; Tue, 11 Dec 2012 13:29:24 +0000 (UTC) Received: by mail-ie0-f180.google.com with SMTP id c10so12589605ieb.11 for ; Tue, 11 Dec 2012 05:29:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-forwarded-to:x-forwarded-for:delivered-to:received-spf:from:to:cc :subject:date:message-id:x-mailer:mime-version:content-type :x-gm-message-state; bh=HbVqAVEsj0R5YDMNkCV9JfKh5GTWrFgWUt6bvaHzolY=; b=OiGkmT5J2ZyMibNN7B9nuiC1EMdHDibmfpXz5iFBcC7CHNcpjXelnaXeLHUnwX638c BxMIW5zcrTJzmcH66+p7CnwXJbr5IvIA8L3CvW+1hd6miRPFUIWYrW3adUHHbN/5XEP5 MRZYR7RfDWowF4SwEsefZDyGg9GQoAPuAWcNXBj6GHvlTHq0kYqzLBF6SCmJ7R4c0WsZ akj3zbVK6xeRGJiIJoSP68tdbOcNBPAf5+7iGV55UDfAKToa9kXlnprYVmAbHRuZKo2l Fj1vrW5xUpmDMEsiGlb3rimvnXj63dehtfiwYLOeOM4cYDPR3r7DGQSSVS0LeB8SAcoq +7+g== Received: by 10.43.49.199 with SMTP id vb7mr14015489icb.6.1355232564244; Tue, 11 Dec 2012 05:29:24 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.50.67.148 with SMTP id n20csp131471igt; Tue, 11 Dec 2012 05:29:23 -0800 (PST) Received: by 10.14.173.69 with SMTP id u45mr60764333eel.21.1355232562935; Tue, 11 Dec 2012 05:29:22 -0800 (PST) Received: from eu1sys200aog110.obsmtp.com (eu1sys200aog110.obsmtp.com [207.126.144.129]) by mx.google.com with SMTP id s8si54862042eeo.139.2012.12.11.05.29.15 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 11 Dec 2012 05:29:22 -0800 (PST) Received-SPF: neutral (google.com: 207.126.144.129 is neither permitted nor denied by best guess record for domain of ulf.hansson@stericsson.com) client-ip=207.126.144.129; Authentication-Results: mx.google.com; spf=neutral (google.com: 207.126.144.129 is neither permitted nor denied by best guess record for domain of ulf.hansson@stericsson.com) smtp.mail=ulf.hansson@stericsson.com Received: from beta.dmz-us.st.com ([167.4.1.35]) (using TLSv1) by eu1sys200aob110.postini.com ([207.126.147.11]) with SMTP ID DSNKUMc1IJYbeEmRp712aFyysMw4qSCBOfl9@postini.com; Tue, 11 Dec 2012 13:29:22 UTC Received: from zeta.dmz-us.st.com (ns4.st.com [167.4.16.71]) by beta.dmz-us.st.com (STMicroelectronics) with ESMTP id CB1B157; Tue, 11 Dec 2012 13:06:30 +0000 (GMT) Received: from relay2.stm.gmessaging.net (unknown [10.230.100.18]) by zeta.dmz-us.st.com (STMicroelectronics) with ESMTP id BE1334E; Tue, 11 Dec 2012 07:57:52 +0000 (GMT) Received: from exdcvycastm003.EQ1STM.local (alteon-source-exch [10.230.100.61]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (Client CN "exdcvycastm003", Issuer "exdcvycastm003" (not verified)) by relay2.stm.gmessaging.net (Postfix) with ESMTPS id C45E6A807E; Tue, 11 Dec 2012 14:07:02 +0100 (CET) Received: from steludxu1397.stericsson.com (10.230.100.153) by smtp.stericsson.com (10.230.100.1) with Microsoft SMTP Server (TLS) id 8.3.83.0; Tue, 11 Dec 2012 14:07:07 +0100 From: Ulf Hansson To: , Chris Ball Cc: , Russell King , Linus Walleij , Ulf Hansson , Per Forlin Subject: [PATCH] mmc: mmci: Fixup and cleanup code for DMA handling Date: Tue, 11 Dec 2012 14:06:32 +0100 Message-ID: <1355231192-4035-1-git-send-email-ulf.hansson@stericsson.com> X-Mailer: git-send-email 1.7.10 MIME-Version: 1.0 X-Gm-Message-State: ALoCoQlKUvDXpHAbjPMIyOHoQMHiBGR0+C6DuRdzEeMjW5tSPPSCK3PfjPToxbD0OSHCOiIwLs75 From: Ulf Hansson The cookie is now used to indicate if dma_unmap_sg shall be done in post_request. At DMA errors, the DMA job is immediately not only terminated but also unmapped. To indicate that this has been done the cookie is reset to zero. post_request will thus only do dma_umap_sg for requests which has a cookie not set to zero. Some corresponding duplicated code could then be removed and moreover some corrections at DMA errors for terminating the same DMA job twice has also been fixed. Signed-off-by: Ulf Hansson Signed-off-by: Per Forlin --- Changes in v2: Rebased patch on top of Linux 3.7 --- drivers/mmc/host/mmci.c | 190 ++++++++++++++++++++++++++--------------------- 1 file changed, 106 insertions(+), 84 deletions(-) diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index aa04b42..cd76793 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -134,6 +134,24 @@ static struct variant_data variant_ux500v2 = { }; /* + * Validate mmc prerequisites + */ +static int mmci_validate_data(struct mmci_host *host, + struct mmc_data *data) +{ + if (!data) + return 0; + + if (!is_power_of_2(data->blksz)) { + dev_err(mmc_dev(host->mmc), + "unsupported block size (%d bytes)\n", data->blksz); + return -EINVAL; + } + + return 0; +} + +/* * This must be called with host->lock held */ static void mmci_write_clkreg(struct mmci_host *host, u32 clk) @@ -352,10 +370,33 @@ static inline void mmci_dma_release(struct mmci_host *host) host->dma_rx_channel = host->dma_tx_channel = NULL; } +static void mmci_dma_data_error(struct mmci_host *host) +{ + dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n"); + dmaengine_terminate_all(host->dma_current); + host->dma_current = NULL; + host->dma_desc_current = NULL; + host->data->host_cookie = 0; +} + static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) { - struct dma_chan *chan = host->dma_current; + struct dma_chan *chan; enum dma_data_direction dir; + + if (data->flags & MMC_DATA_READ) { + dir = DMA_FROM_DEVICE; + chan = host->dma_rx_channel; + } else { + dir = DMA_TO_DEVICE; + chan = host->dma_tx_channel; + } + + dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir); +} + +static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data) +{ u32 status; int i; @@ -374,19 +415,12 @@ static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) * contiguous buffers. On TX, we'll get a FIFO underrun error. */ if (status & MCI_RXDATAAVLBLMASK) { - dmaengine_terminate_all(chan); - if (!data->error) - data->error = -EIO; - } - - if (data->flags & MMC_DATA_WRITE) { - dir = DMA_TO_DEVICE; - } else { - dir = DMA_FROM_DEVICE; + data->error = -EIO; + mmci_dma_data_error(host); } if (!data->host_cookie) - dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir); + mmci_dma_unmap(host, data); /* * Use of DMA with scatter-gather is impossible. @@ -396,16 +430,15 @@ static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n"); mmci_dma_release(host); } -} -static void mmci_dma_data_error(struct mmci_host *host) -{ - dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n"); - dmaengine_terminate_all(host->dma_current); + host->dma_current = NULL; + host->dma_desc_current = NULL; } -static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, - struct mmci_host_next *next) +/* prepares DMA channel and DMA descriptor, returns non-zero on failure */ +static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, + struct dma_chan **dma_chan, + struct dma_async_tx_descriptor **dma_desc) { struct variant_data *variant = host->variant; struct dma_slave_config conf = { @@ -423,16 +456,6 @@ static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, enum dma_data_direction buffer_dirn; int nr_sg; - /* Check if next job is already prepared */ - if (data->host_cookie && !next && - host->dma_current && host->dma_desc_current) - return 0; - - if (!next) { - host->dma_current = NULL; - host->dma_desc_current = NULL; - } - if (data->flags & MMC_DATA_READ) { conf.direction = DMA_DEV_TO_MEM; buffer_dirn = DMA_FROM_DEVICE; @@ -462,29 +485,41 @@ static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, if (!desc) goto unmap_exit; - if (next) { - next->dma_chan = chan; - next->dma_desc = desc; - } else { - host->dma_current = chan; - host->dma_desc_current = desc; - } + *dma_chan = chan; + *dma_desc = desc; return 0; unmap_exit: - if (!next) - dmaengine_terminate_all(chan); dma_unmap_sg(device->dev, data->sg, data->sg_len, buffer_dirn); return -ENOMEM; } +static inline int mmci_dma_prep_data(struct mmci_host *host, + struct mmc_data *data) +{ + /* Check if next job is already prepared. */ + if (host->dma_current && host->dma_desc_current) + return 0; + + /* No job were prepared thus do it now. */ + return __mmci_dma_prep_data(host, data, &host->dma_current, + &host->dma_desc_current); +} + +static inline int mmci_dma_prep_next(struct mmci_host *host, + struct mmc_data *data) +{ + struct mmci_host_next *nd = &host->next_data; + return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc); +} + static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl) { int ret; struct mmc_data *data = host->data; - ret = mmci_dma_prep_data(host, host->data, NULL); + ret = mmci_dma_prep_data(host, host->data); if (ret) return ret; @@ -514,19 +549,11 @@ static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) { struct mmci_host_next *next = &host->next_data; - if (data->host_cookie && data->host_cookie != next->cookie) { - pr_warning("[%s] invalid cookie: data->host_cookie %d" - " host->next_data.cookie %d\n", - __func__, data->host_cookie, host->next_data.cookie); - data->host_cookie = 0; - } - - if (!data->host_cookie) - return; + WARN_ON(data->host_cookie && data->host_cookie != next->cookie); + WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan)); host->dma_desc_current = next->dma_desc; host->dma_current = next->dma_chan; - next->dma_desc = NULL; next->dma_chan = NULL; } @@ -541,19 +568,13 @@ static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq, if (!data) return; - if (data->host_cookie) { - data->host_cookie = 0; + BUG_ON(data->host_cookie); + + if (mmci_validate_data(host, data)) return; - } - /* if config for dma */ - if (((data->flags & MMC_DATA_WRITE) && host->dma_tx_channel) || - ((data->flags & MMC_DATA_READ) && host->dma_rx_channel)) { - if (mmci_dma_prep_data(host, data, nd)) - data->host_cookie = 0; - else - data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie; - } + if (!mmci_dma_prep_next(host, data)) + data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie; } static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq, @@ -561,29 +582,23 @@ static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq, { struct mmci_host *host = mmc_priv(mmc); struct mmc_data *data = mrq->data; - struct dma_chan *chan; - enum dma_data_direction dir; - if (!data) + if (!data || !data->host_cookie) return; - if (data->flags & MMC_DATA_READ) { - dir = DMA_FROM_DEVICE; - chan = host->dma_rx_channel; - } else { - dir = DMA_TO_DEVICE; - chan = host->dma_tx_channel; - } + mmci_dma_unmap(host, data); + if (err) { + struct mmci_host_next *next = &host->next_data; + struct dma_chan *chan; + if (data->flags & MMC_DATA_READ) + chan = host->dma_rx_channel; + else + chan = host->dma_tx_channel; + dmaengine_terminate_all(chan); - /* if config for dma */ - if (chan) { - if (err) - dmaengine_terminate_all(chan); - if (data->host_cookie) - dma_unmap_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, dir); - mrq->data->host_cookie = 0; + next->dma_desc = NULL; + next->dma_chan = NULL; } } @@ -604,6 +619,11 @@ static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) { } +static inline void mmci_dma_finalize(struct mmci_host *host, + struct mmc_data *data) +{ +} + static inline void mmci_dma_data_error(struct mmci_host *host) { } @@ -751,8 +771,10 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, u32 remain, success; /* Terminate the DMA transfer */ - if (dma_inprogress(host)) + if (dma_inprogress(host)) { mmci_dma_data_error(host); + mmci_dma_unmap(host, data); + } /* * Calculate how far we are into the transfer. Note that @@ -791,7 +813,7 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, if (status & MCI_DATAEND || data->error) { if (dma_inprogress(host)) - mmci_dma_unmap(host, data); + mmci_dma_finalize(host, data); mmci_stop_data(host); if (!data->error) @@ -828,8 +850,10 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, if (!cmd->data || cmd->error) { if (host->data) { /* Terminate the DMA transfer */ - if (dma_inprogress(host)) + if (dma_inprogress(host)) { mmci_dma_data_error(host); + mmci_dma_unmap(host, host->data); + } mmci_stop_data(host); } mmci_request_end(host, cmd->mrq); @@ -1055,10 +1079,8 @@ static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq) WARN_ON(host->mrq != NULL); - if (mrq->data && !is_power_of_2(mrq->data->blksz)) { - dev_err(mmc_dev(mmc), "unsupported block size (%d bytes)\n", - mrq->data->blksz); - mrq->cmd->error = -EINVAL; + mrq->cmd->error = mmci_validate_data(host, mrq->data); + if (mrq->cmd->error) { mmc_request_done(mmc, mrq); return; }