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Default value of adma_table_num is set to (SDHCI_MAX_SEGS * 2 + 1). Signed-off-by: Jisheng Zhang --- drivers/mmc/host/sdhci.c | 17 +++++++++-------- drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index a7b5602ef6f7..14dd4a49e03b 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3316,6 +3316,13 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev, host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG; + /* + * The DMA descriptor table number is calculated as the maximum + * number of segments times 2, to allow for an alignment + * descriptor for each segment, plus 1 for a nop end descriptor. + */ + host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1; + return host; } @@ -3561,18 +3568,12 @@ int sdhci_setup_host(struct sdhci_host *host) dma_addr_t dma; void *buf; - /* - * The DMA descriptor table size is calculated as the maximum - * number of segments times 2, to allow for an alignment - * descriptor for each segment, plus 1 for a nop end descriptor, - * all multipled by the descriptor size. - */ if (host->flags & SDHCI_USE_64_BIT_DMA) { - host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * + host->adma_table_sz = host->adma_table_num * SDHCI_ADMA2_64_DESC_SZ; host->desc_sz = SDHCI_ADMA2_64_DESC_SZ; } else { - host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * + host->adma_table_sz = host->adma_table_num * SDHCI_ADMA2_32_DESC_SZ; host->desc_sz = SDHCI_ADMA2_32_DESC_SZ; } diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 23966f887da6..d55fd7033e93 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -563,6 +563,8 @@ struct sdhci_host { /* Host SDMA buffer boundary. */ u32 sdma_boundary; + u32 adma_table_num; + u64 data_timeout; unsigned long private[0] ____cacheline_aligned; From patchwork Wed Jul 25 09:46:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 10543777 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 56941112E for ; Wed, 25 Jul 2018 09:48:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4175C29B44 for ; 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We also rename the original sdhci_adma_write_desc() to _sdhci_adma_write_desc() and export it, so that it could be reused by driver's specific implementations. Signed-off-by: Jisheng Zhang --- drivers/mmc/host/sdhci.c | 31 +++++++++++++++++++++++-------- drivers/mmc/host/sdhci.h | 6 ++++++ 2 files changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 14dd4a49e03b..50c846d99182 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -554,8 +554,8 @@ static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags) local_irq_restore(*flags); } -static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc, - dma_addr_t addr, int len, unsigned cmd) +unsigned int _sdhci_adma_write_desc(struct sdhci_host *host, void *desc, + dma_addr_t addr, int len, unsigned int cmd) { struct sdhci_adma2_64_desc *dma_desc = desc; @@ -566,6 +566,19 @@ static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc, if (host->flags & SDHCI_USE_64_BIT_DMA) dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32); + + return host->desc_sz; +} +EXPORT_SYMBOL_GPL(_sdhci_adma_write_desc); + +static unsigned int sdhci_adma_write_desc(struct sdhci_host *host, void *desc, + dma_addr_t addr, int len, + unsigned int cmd) +{ + if (host->ops->adma_write_desc) + return host->ops->adma_write_desc(host, desc, addr, len, cmd); + + return _sdhci_adma_write_desc(host, desc, addr, len, cmd); } static void sdhci_adma_mark_end(void *desc) @@ -585,6 +598,7 @@ static void sdhci_adma_table_pre(struct sdhci_host *host, void *desc, *align; char *buffer; int len, offset, i; + unsigned int desc_sz; /* * The spec does not specify endianness of descriptor table. @@ -618,15 +632,16 @@ static void sdhci_adma_table_pre(struct sdhci_host *host, } /* tran, valid */ - sdhci_adma_write_desc(host, desc, align_addr, offset, - ADMA2_TRAN_VALID); + desc_sz = sdhci_adma_write_desc(host, desc, + align_addr, offset, + ADMA2_TRAN_VALID); BUG_ON(offset > 65536); align += SDHCI_ADMA2_ALIGN; align_addr += SDHCI_ADMA2_ALIGN; - desc += host->desc_sz; + desc += desc_sz; addr += offset; len -= offset; @@ -636,9 +651,9 @@ static void sdhci_adma_table_pre(struct sdhci_host *host, if (len) { /* tran, valid */ - sdhci_adma_write_desc(host, desc, addr, len, - ADMA2_TRAN_VALID); - desc += host->desc_sz; + desc_sz = sdhci_adma_write_desc(host, desc, addr, len, + ADMA2_TRAN_VALID); + desc += desc_sz; } /* diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index d55fd7033e93..0aad0ee8f63b 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -605,6 +605,9 @@ struct sdhci_ops { void (*adma_workaround)(struct sdhci_host *host, u32 intmask); void (*card_event)(struct sdhci_host *host); void (*voltage_switch)(struct sdhci_host *host); + unsigned int (*adma_write_desc)(struct sdhci_host *host, void *desc, + dma_addr_t addr, int len, + unsigned int cmd); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS @@ -735,6 +738,9 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios); void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable); +unsigned int _sdhci_adma_write_desc(struct sdhci_host *host, void *desc, + dma_addr_t addr, int len, + unsigned int cmd); 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Wed, 25 Jul 2018 09:50:04 +0000 Date: Wed, 25 Jul 2018 17:47:49 +0800 From: Jisheng Zhang To: Adrian Hunter , Ulf Hansson Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH mmc-next 3/3] mmc: sdhci-of-dwcmshc: solve 128MB DMA boundary limitation Message-ID: <20180725174749.6fc97d4d@xhacker.debian> In-Reply-To: <20180725174235.1ca764cf@xhacker.debian> References: <20180725174235.1ca764cf@xhacker.debian> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-Originating-IP: [124.74.246.114] X-ClientProxiedBy: TY1PR01CA0146.jpnprd01.prod.outlook.com (2603:1096:402:1::22) To BY2PR0301MB1576.namprd03.prod.outlook.com (2a01:111:e400:526e::18) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 80c3348e-8b89-463c-0266-08d5f2140001 X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989117)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(5600073)(711020)(2017052603328)(7153060)(7193020);SRVR:BY2PR0301MB1576; 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Signed-off-by: Jisheng Zhang --- drivers/mmc/host/sdhci-of-dwcmshc.c | 41 +++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index 1b7cd144fb01..01b5cb772554 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -13,16 +13,45 @@ #include "sdhci-pltfm.h" +#define BOUNDARY_OK(addr, len) \ + ((addr | (SZ_128M - 1)) == ((addr + len) | (SZ_128M - 1))) + struct dwcmshc_priv { struct clk *bus_clk; }; +/* + * if DMA addr spans 128MB boundary, we split the DMA transfer into two + * so that the DMA transfer doesn't exceed the boundary. + */ +static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host, + void *desc, dma_addr_t addr, + int len, unsigned int cmd) +{ + int tmplen, offset; + + if (BOUNDARY_OK(addr, len)) + return _sdhci_adma_write_desc(host, desc, addr, len, cmd); + + offset = addr & (SZ_128M - 1); + tmplen = SZ_128M - offset; + _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); + + addr += tmplen; + len -= tmplen; + desc += host->desc_sz; + _sdhci_adma_write_desc(host, desc, addr, len, cmd); + + return host->desc_sz * 2; +} + static const struct sdhci_ops sdhci_dwcmshc_ops = { .set_clock = sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, .set_uhs_signaling = sdhci_set_uhs_signaling, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .reset = sdhci_reset, + .adma_write_desc = dwcmshc_adma_write_desc, }; static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { @@ -36,12 +65,24 @@ static int dwcmshc_probe(struct platform_device *pdev) struct sdhci_host *host; struct dwcmshc_priv *priv; int err; + u32 extra; host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata, sizeof(struct dwcmshc_priv)); if (IS_ERR(host)) return PTR_ERR(host); + /* + * The DMA descriptor table number is calculated as the maximum + * number of segments times 2, to allow for an alignment + * descriptor for each segment, plus 1 for a nop end descriptor, + * plus extra number for cross 128M boundary handling. + */ + extra = totalram_pages / (SZ_128M / PAGE_SIZE) + 1; + if (extra > SDHCI_MAX_SEGS) + extra = SDHCI_MAX_SEGS; + host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra; + pltfm_host = sdhci_priv(host); priv = sdhci_pltfm_priv(pltfm_host);