Date:   Mon, 25 Sep 2017 17:46:05 +0800
From:   Huacai Chen <chenhc@...ote.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fuxin Zhang <zhangfx@...ote.com>, linux-kernel@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...tec.com>,
        linux-mips@...ux-mips.org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, Roland Dreier <rolandd@...co.com>,
        Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ivan Mikhaylov <ivan@...ibm.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Andy Gross <agross@...eaurora.org>,
        "Mark A . Greer" <mgreer@...sta.com>,
        Robert Baldyga <r.baldyga@...sung.com>,
        Huacai Chen <chenhc@...ote.com>, stable@...r.kernel.org
Subject: [PATCH V7 1/2] dma-mapping: Rework dma_get_cache_alignment()

Make dma_get_cache_alignment() to accept a 'dev' argument. As a result,
it can return different alignments due to different devices' I/O cache
coherency.

Currently, MIPS is the only architecture which support coherent & non-
coherent devices co-exist. This may be changed in the future, so add a
new get_cache_alignment() function pointer in 'struct dma_map_ops' as a
generic solution.

For compatibility (always return ARCH_DMA_MINALIGN), make all existing
callers pass a NULL dev argument to dma_get_cache_alignment().

Cc: stable@...r.kernel.org
Signed-off-by: Huacai Chen <chenhc@...ote.com>
---
 arch/mips/cavium-octeon/dma-octeon.c           |  3 ++-
 arch/mips/include/asm/dma-mapping.h            |  2 ++
 arch/mips/loongson64/common/dma-swiotlb.c      |  1 +
 arch/mips/mm/dma-default.c                     | 11 ++++++++++-
 arch/mips/netlogic/common/nlm-dma.c            |  3 ++-
 drivers/infiniband/hw/mthca/mthca_main.c       |  2 +-
 drivers/media/v4l2-core/videobuf2-dma-contig.c |  2 +-
 drivers/net/ethernet/broadcom/b44.c            |  2 +-
 drivers/net/ethernet/ibm/emac/core.h           |  2 +-
 drivers/net/ethernet/mellanox/mlx4/main.c      |  2 +-
 drivers/spi/spi-qup.c                          |  4 ++--
 drivers/tty/serial/mpsc.c                      | 16 ++++++++--------
 drivers/tty/serial/samsung.c                   | 14 +++++++-------
 include/linux/dma-mapping.h                    | 17 ++++++++++++-----
 14 files changed, 51 insertions(+), 30 deletions(-)

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index c64bd87..7978237 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -324,7 +324,8 @@ static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = {
 		.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 		.sync_sg_for_device = octeon_dma_sync_sg_for_device,
 		.mapping_error = swiotlb_dma_mapping_error,
-		.dma_supported = swiotlb_dma_supported
+		.dma_supported = swiotlb_dma_supported,
+		.get_cache_alignment = mips_get_cache_alignment
 	},
 };
 
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index aba7138..e2c5d9e 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -39,4 +39,6 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 #endif
 }
 
+int mips_get_cache_alignment(struct device *dev);
+
 #endif /* _ASM_DMA_MAPPING_H */
diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c
index 34486c1..09cb8a4 100644
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/common/dma-swiotlb.c
@@ -119,6 +119,7 @@ static const struct dma_map_ops loongson_dma_map_ops = {
 	.sync_sg_for_device = loongson_dma_sync_sg_for_device,
 	.mapping_error = swiotlb_dma_mapping_error,
 	.dma_supported = loongson_dma_supported,
+	.get_cache_alignment = mips_get_cache_alignment
 };
 
 void __init plat_swiotlb_setup(void)
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index c01bd20..c49987e 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -394,6 +394,14 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 
 EXPORT_SYMBOL(dma_cache_sync);
 
+int mips_get_cache_alignment(struct device *dev)
+{
+	if (plat_device_is_coherent(dev))
+		return 1;
+	else
+		return ARCH_DMA_MINALIGN;
+}
+
 static const struct dma_map_ops mips_default_dma_map_ops = {
 	.alloc = mips_dma_alloc_coherent,
 	.free = mips_dma_free_coherent,
@@ -407,7 +415,8 @@ static const struct dma_map_ops mips_default_dma_map_ops = {
 	.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
 	.sync_sg_for_device = mips_dma_sync_sg_for_device,
 	.mapping_error = mips_dma_mapping_error,
-	.dma_supported = mips_dma_supported
+	.dma_supported = mips_dma_supported,
+	.get_cache_alignment = mips_get_cache_alignment
 };
 
 const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
index 0ec9d9d..1e107ac 100644
--- a/arch/mips/netlogic/common/nlm-dma.c
+++ b/arch/mips/netlogic/common/nlm-dma.c
@@ -79,7 +79,8 @@ const struct dma_map_ops nlm_swiotlb_dma_ops = {
 	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 	.sync_sg_for_device = swiotlb_sync_sg_for_device,
 	.mapping_error = swiotlb_dma_mapping_error,
-	.dma_supported = swiotlb_dma_supported
+	.dma_supported = swiotlb_dma_supported,
+	.get_cache_alignment = mips_get_cache_alignment
 };
 
 void __init plat_swiotlb_setup(void)
diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index e36a9bc..cac5fac 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -416,7 +416,7 @@ static int mthca_init_icm(struct mthca_dev *mdev,
 
 	/* CPU writes to non-reserved MTTs, while HCA might DMA to reserved mtts */
 	mdev->limits.reserved_mtts = ALIGN(mdev->limits.reserved_mtts * mdev->limits.mtt_seg_size,
-					   dma_get_cache_alignment()) / mdev->limits.mtt_seg_size;
+					   dma_get_cache_alignment(NULL)) / mdev->limits.mtt_seg_size;
 
 	mdev->mr_table.mtt_table = mthca_alloc_icm_table(mdev, init_hca->mtt_base,
 							 mdev->limits.mtt_seg_size,
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 9f389f3..7f54739 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -484,7 +484,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
 	int ret = 0;
 	struct sg_table *sgt;
 	unsigned long contig_size;
-	unsigned long dma_align = dma_get_cache_alignment();
+	unsigned long dma_align = dma_get_cache_alignment(NULL);
 
 	/* Only cache aligned DMA transfers are reliable */
 	if (!IS_ALIGNED(vaddr | size, dma_align)) {
diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index a1125d1..291d6af 100644
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -2587,7 +2587,7 @@ static inline void b44_pci_exit(void)
 
 static int __init b44_init(void)
 {
-	unsigned int dma_desc_align_size = dma_get_cache_alignment();
+	unsigned int dma_desc_align_size = dma_get_cache_alignment(NULL);
 	int err;
 
 	/* Setup paramaters for syncing RX/TX DMA descriptors */
diff --git a/drivers/net/ethernet/ibm/emac/core.h b/drivers/net/ethernet/ibm/emac/core.h
index 369de2c..236bf37 100644
--- a/drivers/net/ethernet/ibm/emac/core.h
+++ b/drivers/net/ethernet/ibm/emac/core.h
@@ -68,7 +68,7 @@ static inline int emac_rx_size(int mtu)
 		return mal_rx_size(ETH_DATA_LEN + EMAC_MTU_OVERHEAD);
 }
 
-#define EMAC_DMA_ALIGN(x)		ALIGN((x), dma_get_cache_alignment())
+#define EMAC_DMA_ALIGN(x)		ALIGN((x), dma_get_cache_alignment(NULL))
 
 #define EMAC_RX_SKB_HEADROOM		\
 	EMAC_DMA_ALIGN(CONFIG_IBM_EMAC_RX_SKB_HEADROOM)
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index e61c99e..56b1449 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1660,7 +1660,7 @@ static int mlx4_init_icm(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap,
 	 */
 	dev->caps.reserved_mtts =
 		ALIGN(dev->caps.reserved_mtts * dev->caps.mtt_entry_sz,
-		      dma_get_cache_alignment()) / dev->caps.mtt_entry_sz;
+		      dma_get_cache_alignment(NULL)) / dev->caps.mtt_entry_sz;
 
 	err = mlx4_init_icm_table(dev, &priv->mr_table.mtt_table,
 				  init_hca->mtt_base,
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 974a8ce..0c698c3 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -862,7 +862,7 @@ static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
 			    struct spi_transfer *xfer)
 {
 	struct spi_qup *qup = spi_master_get_devdata(master);
-	size_t dma_align = dma_get_cache_alignment();
+	size_t dma_align = dma_get_cache_alignment(NULL);
 	int n_words;
 
 	if (xfer->rx_buf) {
@@ -1038,7 +1038,7 @@ static int spi_qup_probe(struct platform_device *pdev)
 	master->transfer_one = spi_qup_transfer_one;
 	master->dev.of_node = pdev->dev.of_node;
 	master->auto_runtime_pm = true;
-	master->dma_alignment = dma_get_cache_alignment();
+	master->dma_alignment = dma_get_cache_alignment(NULL);
 	master->max_dma_len = SPI_MAX_XFER;
 
 	platform_set_drvdata(pdev, master);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 67ffecc..e2f792a 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -81,19 +81,19 @@
  * Number of Tx & Rx descriptors must be powers of 2.
  */
 #define	MPSC_RXR_ENTRIES	32
-#define	MPSC_RXRE_SIZE		dma_get_cache_alignment()
+#define	MPSC_RXRE_SIZE		dma_get_cache_alignment(NULL)
 #define	MPSC_RXR_SIZE		(MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
-#define	MPSC_RXBE_SIZE		dma_get_cache_alignment()
+#define	MPSC_RXBE_SIZE		dma_get_cache_alignment(NULL)
 #define	MPSC_RXB_SIZE		(MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
 
 #define	MPSC_TXR_ENTRIES	32
-#define	MPSC_TXRE_SIZE		dma_get_cache_alignment()
+#define	MPSC_TXRE_SIZE		dma_get_cache_alignment(NULL)
 #define	MPSC_TXR_SIZE		(MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
-#define	MPSC_TXBE_SIZE		dma_get_cache_alignment()
+#define	MPSC_TXBE_SIZE		dma_get_cache_alignment(NULL)
 #define	MPSC_TXB_SIZE		(MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
 
 #define	MPSC_DMA_ALLOC_SIZE	(MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
-		+ MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
+		+ MPSC_TXB_SIZE + dma_get_cache_alignment(NULL) /* for alignment */)
 
 /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
 struct mpsc_rx_desc {
@@ -738,7 +738,7 @@ static void mpsc_init_hw(struct mpsc_port_info *pi)
 
 	mpsc_brg_init(pi, pi->brg_clk_src);
 	mpsc_brg_enable(pi);
-	mpsc_sdma_init(pi, dma_get_cache_alignment());	/* burst a cacheline */
+	mpsc_sdma_init(pi, dma_get_cache_alignment(NULL));	/* burst a cacheline */
 	mpsc_sdma_stop(pi);
 	mpsc_hw_init(pi);
 }
@@ -798,8 +798,8 @@ static void mpsc_init_rings(struct mpsc_port_info *pi)
 	 * Descriptors & buffers are multiples of cacheline size and must be
 	 * cacheline aligned.
 	 */
-	dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
-	dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
+	dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment(NULL));
+	dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment(NULL));
 
 	/*
 	 * Partition dma region into rx ring descriptor, rx buffers,
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 8aca18c..b40a681 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -241,7 +241,7 @@ static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 	/* Enable tx dma mode */
 	ucon = rd_regl(port, S3C2410_UCON);
 	ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
-	ucon |= (dma_get_cache_alignment() >= 16) ?
+	ucon |= (dma_get_cache_alignment(NULL) >= 16) ?
 		S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
 	ucon |= S3C64XX_UCON_TXMODE_DMA;
 	wr_regl(port,  S3C2410_UCON, ucon);
@@ -292,7 +292,7 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 	if (ourport->tx_mode != S3C24XX_TX_DMA)
 		enable_tx_dma(ourport);
 
-	dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
+	dma->tx_size = count & ~(dma_get_cache_alignment(NULL) - 1);
 	dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 
 	dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
@@ -332,7 +332,7 @@ static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 
 	if (!ourport->dma || !ourport->dma->tx_chan ||
 	    count < ourport->min_dma_size ||
-	    xmit->tail & (dma_get_cache_alignment() - 1))
+	    xmit->tail & (dma_get_cache_alignment(NULL) - 1))
 		s3c24xx_serial_start_tx_pio(ourport);
 	else
 		s3c24xx_serial_start_tx_dma(ourport, count);
@@ -718,8 +718,8 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 
 	if (ourport->dma && ourport->dma->tx_chan &&
 	    count >= ourport->min_dma_size) {
-		int align = dma_get_cache_alignment() -
-			(xmit->tail & (dma_get_cache_alignment() - 1));
+		int align = dma_get_cache_alignment(NULL) -
+			(xmit->tail & (dma_get_cache_alignment(NULL) - 1));
 		if (count-align >= ourport->min_dma_size) {
 			dma_count = count-align;
 			count = align;
@@ -870,7 +870,7 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 	dma->tx_conf.direction		= DMA_MEM_TO_DEV;
 	dma->tx_conf.dst_addr_width	= DMA_SLAVE_BUSWIDTH_1_BYTE;
 	dma->tx_conf.dst_addr		= p->port.mapbase + S3C2410_UTXH;
-	if (dma_get_cache_alignment() >= 16)
+	if (dma_get_cache_alignment(NULL) >= 16)
 		dma->tx_conf.dst_maxburst = 16;
 	else
 		dma->tx_conf.dst_maxburst = 1;
@@ -1849,7 +1849,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	 * so find minimal transfer size suitable for DMA mode
 	 */
 	ourport->min_dma_size = max_t(int, ourport->port.fifosize,
-				    dma_get_cache_alignment());
+				    dma_get_cache_alignment(NULL));
 
 	dbg("%s: initialising port %p...\n", __func__, ourport);
 
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 29ce981..1326023 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -131,6 +131,7 @@ struct dma_map_ops {
 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 	u64 (*get_required_mask)(struct device *dev);
 #endif
+	int (*get_cache_alignment)(struct device *dev);
 	int is_phys;
 };
 
@@ -697,12 +698,18 @@ static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 }
 
 #ifdef CONFIG_HAS_DMA
-static inline int dma_get_cache_alignment(void)
-{
-#ifdef ARCH_DMA_MINALIGN
-	return ARCH_DMA_MINALIGN;
+
+#ifndef ARCH_DMA_MINALIGN
+#define ARCH_DMA_MINALIGN 1
 #endif
-	return 1;
+
+static inline int dma_get_cache_alignment(struct device *dev)
+{
+	const struct dma_map_ops *ops = get_dma_ops(dev);
+	if (dev && ops && ops->get_cache_alignment)
+		return ops->get_cache_alignment(dev);
+
+	return ARCH_DMA_MINALIGN; /* compatible behavior */
 }
 #endif
 
-- 
2.7.0

Powered by blists - more mailing lists