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From: Christoph Hellwig <hch@lst.de>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Nicolas Pitre <nico@fluxnic.net>,
	Aaro Koskinen <aaro.koskinen@iki.fi>,
	Ben Dooks <ben-linux@fluff.org>,
	linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-omap@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 04/11] mmc: omap: handle chained sglists
Date: Mon, 14 Jan 2019 10:57:57 +0100	[thread overview]
Message-ID: <20190114095804.27978-5-hch@lst.de> (raw)
In-Reply-To: <20190114095804.27978-1-hch@lst.de>

Use the proper sg_next() helper to move to the next scatterlist element
to support chained scatterlists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/mmc/host/omap.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 0377ac6194a0..248707aba2df 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -148,7 +148,7 @@ struct mmc_omap_host {
 	struct mmc_data		*stop_data;
 
 	unsigned int		sg_len;
-	int			sg_idx;
+	struct scatterlist	*cur_sg;
 	u32			buffer_offset;
 	u32			buffer_bytes_left;
 	u32			total_bytes_left;
@@ -646,11 +646,8 @@ mmc_omap_cmd_timer(struct timer_list *t)
 static void
 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 {
-	struct scatterlist *sg;
-
-	sg = host->data->sg + host->sg_idx;
-	host->buffer_bytes_left = sg->length;
-	host->buffer_offset = sg->offset;
+	host->buffer_bytes_left = host->cur_sg->length;
+	host->buffer_offset = host->cur_sg->offset;
 	if (host->buffer_bytes_left > host->total_bytes_left)
 		host->buffer_bytes_left = host->total_bytes_left;
 }
@@ -667,13 +664,12 @@ mmc_omap_clk_timer(struct timer_list *t)
 static void
 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 {
-	struct scatterlist *sg = host->data->sg + host->sg_idx;
+	struct scatterlist *sg = host->cur_sg;
 	int n, nwords;
 	void *p;
 
 	if (host->buffer_bytes_left == 0) {
-		host->sg_idx++;
-		BUG_ON(host->sg_idx == host->sg_len);
+		host->cur_sg = sg_next(host->cur_sg);
 		mmc_omap_sg_to_buf(host);
 	}
 	n = 64;
@@ -985,7 +981,7 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 		}
 	}
 
-	host->sg_idx = 0;
+	host->cur_sg = host->data->sg;
 	if (use_dma) {
 		enum dma_data_direction dma_data_dir;
 		struct dma_async_tx_descriptor *tx;
-- 
2.20.1


WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>,
	Nicolas Pitre <nico@fluxnic.net>,
	linux-mmc@vger.kernel.org, Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Ben Dooks <ben-linux@fluff.org>,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 04/11] mmc: omap: handle chained sglists
Date: Mon, 14 Jan 2019 10:57:57 +0100	[thread overview]
Message-ID: <20190114095804.27978-5-hch@lst.de> (raw)
In-Reply-To: <20190114095804.27978-1-hch@lst.de>

Use the proper sg_next() helper to move to the next scatterlist element
to support chained scatterlists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/mmc/host/omap.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 0377ac6194a0..248707aba2df 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -148,7 +148,7 @@ struct mmc_omap_host {
 	struct mmc_data		*stop_data;
 
 	unsigned int		sg_len;
-	int			sg_idx;
+	struct scatterlist	*cur_sg;
 	u32			buffer_offset;
 	u32			buffer_bytes_left;
 	u32			total_bytes_left;
@@ -646,11 +646,8 @@ mmc_omap_cmd_timer(struct timer_list *t)
 static void
 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 {
-	struct scatterlist *sg;
-
-	sg = host->data->sg + host->sg_idx;
-	host->buffer_bytes_left = sg->length;
-	host->buffer_offset = sg->offset;
+	host->buffer_bytes_left = host->cur_sg->length;
+	host->buffer_offset = host->cur_sg->offset;
 	if (host->buffer_bytes_left > host->total_bytes_left)
 		host->buffer_bytes_left = host->total_bytes_left;
 }
@@ -667,13 +664,12 @@ mmc_omap_clk_timer(struct timer_list *t)
 static void
 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 {
-	struct scatterlist *sg = host->data->sg + host->sg_idx;
+	struct scatterlist *sg = host->cur_sg;
 	int n, nwords;
 	void *p;
 
 	if (host->buffer_bytes_left == 0) {
-		host->sg_idx++;
-		BUG_ON(host->sg_idx == host->sg_len);
+		host->cur_sg = sg_next(host->cur_sg);
 		mmc_omap_sg_to_buf(host);
 	}
 	n = 64;
@@ -985,7 +981,7 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 		}
 	}
 
-	host->sg_idx = 0;
+	host->cur_sg = host->data->sg;
 	if (use_dma) {
 		enum dma_data_direction dma_data_dir;
 		struct dma_async_tx_descriptor *tx;
-- 
2.20.1


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  parent reply	other threads:[~2019-01-14  9:58 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14  9:57 remove block layer bounce buffering for MMC Christoph Hellwig
2019-01-14  9:57 ` Christoph Hellwig
2019-01-14  9:57 ` Christoph Hellwig
2019-01-14  9:57 ` [PATCH 01/11] mmc: davinci: handle highmem pages Christoph Hellwig
2019-01-14  9:57   ` Christoph Hellwig
2019-01-14  9:57 ` [PATCH 02/11] mmc: moxart: " Christoph Hellwig
2019-01-14  9:57   ` Christoph Hellwig
2019-01-14  9:57 ` [PATCH 03/11] mmc: omap: " Christoph Hellwig
2019-01-14  9:57   ` Christoph Hellwig
2019-01-14  9:57 ` Christoph Hellwig [this message]
2019-01-14  9:57   ` [PATCH 04/11] mmc: omap: handle chained sglists Christoph Hellwig
2019-01-14  9:57 ` [PATCH 05/11] mmc: s3cmci: handle highmem pages Christoph Hellwig
2019-01-14  9:57   ` Christoph Hellwig
2019-01-30  7:57   ` Ulf Hansson
2019-01-30  7:57     ` Ulf Hansson
2019-01-30  8:04     ` Christoph Hellwig
2019-01-30  8:04       ` Christoph Hellwig
2019-01-30  8:16       ` Ulf Hansson
2019-01-30  8:16         ` Ulf Hansson
2019-01-14  9:57 ` [PATCH 06/11] mmc: s3cmci: handle chained sglists Christoph Hellwig
2019-01-14  9:57   ` Christoph Hellwig
2019-01-14  9:58 ` [PATCH 07/11] mmc: mvsdio: handle highmem pages Christoph Hellwig
2019-01-14  9:58   ` Christoph Hellwig
2019-01-14 16:29   ` Nicolas Pitre
2019-01-14 16:29     ` Nicolas Pitre
2019-01-30  7:55   ` Ulf Hansson
2019-01-30  7:55     ` Ulf Hansson
2019-01-14  9:58 ` [PATCH 08/11] mmc: sh_mmcif: " Christoph Hellwig
2019-01-14  9:58   ` Christoph Hellwig
2019-01-14  9:58 ` [PATCH 09/11] mmc: sh_mmcif: handle chained sglists Christoph Hellwig
2019-01-14  9:58   ` Christoph Hellwig
2019-01-14  9:58 ` [PATCH 10/11] mmc: core: don't use block layer bounce buffers Christoph Hellwig
2019-01-14  9:58   ` Christoph Hellwig
2019-01-14  9:58 ` [PATCH 11/11] dma-mapping: remove dma_max_pfn Christoph Hellwig
2019-01-14  9:58   ` Christoph Hellwig
2019-01-14 10:26 ` remove block layer bounce buffering for MMC Ulf Hansson
2019-01-14 10:26   ` Ulf Hansson
2019-01-16 10:24   ` Arnd Bergmann
2019-01-16 10:24     ` Arnd Bergmann
2019-01-16 13:51     ` Linus Walleij
2019-01-16 13:51       ` Linus Walleij
2019-01-16 13:54       ` Arnd Bergmann
2019-01-16 13:54         ` Arnd Bergmann
2019-01-14 16:52 ` Robin Murphy
2019-01-14 16:52   ` Robin Murphy
2019-01-14 16:57   ` Christoph Hellwig
2019-01-14 16:57     ` Christoph Hellwig

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