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* [PATCH v5] serial: samsung: use dma_ops of DMA if attached
       [not found] <CGME20210629045610epcas5p4fa9d2a217b351a950899073d6b7d3dfd@epcas5p4.samsung.com>
@ 2021-06-29  4:59 ` Tamseel Shams
  2021-06-29  8:31   ` Marek Szyprowski
  2021-06-29  9:44   ` Krzysztof Kozlowski
  0 siblings, 2 replies; 3+ messages in thread
From: Tamseel Shams @ 2021-06-29  4:59 UTC (permalink / raw)
  To: krzysztof.kozlowski, gregkh, jirislaby
  Cc: linux-arm-kernel, linux-samsung-soc, linux-serial, linux-kernel,
	alim.akhtar, ajaykumar.rs, robin.murphy, Tamseel Shams

When DMA is used for TX and RX by serial driver, it should
pass the DMA device pointer to DMA API instead of UART device
pointer. DMA device should be used for DMA API because only
the DMA device is aware of how the device connects to the memory.
There might be an extra level of address translation due to a
SMMU attached to the DMA device. When serial device is used for
DMA API, the DMA API will have no clue of the SMMU attached to
the DMA device.

This patch is necessary to fix the SMMU page faults
which is observed when a DMA(with SMMU enabled) is attached
to UART for transfer.

Signed-off-by: Tamseel Shams <m.shams@samsung.com>
Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
---
Changes since v1:
1. Rebased the patch on "tty-next" branch of TTY driver tree

Changes since v2:
1. Updated the commit message.
2. Changed the comment description

Changes since v3:
1. Removed the null pointer check for "dma", "dma->tx_chan" and
"dma->rx_chan" and instead sending DMA device pointer while calling
DMA API.

Changes since v4:
1. Fixed the alignments of arguments.

 drivers/tty/serial/samsung_tty.c | 46 +++++++++++++++++---------------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 9fbc61151c2e..0cf4dfe77c32 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -305,8 +305,9 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
 		dmaengine_pause(dma->tx_chan);
 		dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 		dmaengine_terminate_all(dma->tx_chan);
-		dma_sync_single_for_cpu(ourport->port.dev,
-			dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
+		dma_sync_single_for_cpu(dma->tx_chan->device->dev,
+					dma->tx_transfer_addr, dma->tx_size,
+					DMA_TO_DEVICE);
 		async_tx_ack(dma->tx_desc);
 		count = dma->tx_bytes_requested - state.residue;
 		xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
@@ -338,8 +339,9 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
 	count = dma->tx_bytes_requested - state.residue;
 	async_tx_ack(dma->tx_desc);
 
-	dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
-				dma->tx_size, DMA_TO_DEVICE);
+	dma_sync_single_for_cpu(dma->tx_chan->device->dev,
+				dma->tx_transfer_addr, dma->tx_size,
+				DMA_TO_DEVICE);
 
 	spin_lock_irqsave(&port->lock, flags);
 
@@ -443,8 +445,9 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 	dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 	dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 
-	dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
-				dma->tx_size, DMA_TO_DEVICE);
+	dma_sync_single_for_device(dma->tx_chan->device->dev,
+				   dma->tx_transfer_addr, dma->tx_size,
+				   DMA_TO_DEVICE);
 
 	dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
 				dma->tx_transfer_addr, dma->tx_size,
@@ -515,7 +518,7 @@ static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 	if (!count)
 		return;
 
-	dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
+	dma_sync_single_for_cpu(dma->rx_chan->device->dev, dma->rx_addr,
 				dma->rx_size, DMA_FROM_DEVICE);
 
 	ourport->port.icount.rx += count;
@@ -636,8 +639,8 @@ static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
 {
 	struct s3c24xx_uart_dma *dma = ourport->dma;
 
-	dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
-				dma->rx_size, DMA_FROM_DEVICE);
+	dma_sync_single_for_device(dma->rx_chan->device->dev, dma->rx_addr,
+				   dma->rx_size, DMA_FROM_DEVICE);
 
 	dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
 				dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
@@ -1102,18 +1105,19 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 		goto err_release_tx;
 	}
 
-	dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
-				dma->rx_size, DMA_FROM_DEVICE);
-	if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
+	dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
+				      dma->rx_size, DMA_FROM_DEVICE);
+	if (dma_mapping_error(dma->rx_chan->device->dev, dma->rx_addr)) {
 		reason = "DMA mapping error for RX buffer";
 		ret = -EIO;
 		goto err_free_rx;
 	}
 
 	/* TX buffer */
-	dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
-				UART_XMIT_SIZE, DMA_TO_DEVICE);
-	if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
+	dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
+				      p->port.state->xmit.buf, UART_XMIT_SIZE,
+				      DMA_TO_DEVICE);
+	if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
 		reason = "DMA mapping error for TX buffer";
 		ret = -EIO;
 		goto err_unmap_rx;
@@ -1122,8 +1126,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 	return 0;
 
 err_unmap_rx:
-	dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
-			 DMA_FROM_DEVICE);
+	dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+			 dma->rx_size, DMA_FROM_DEVICE);
 err_free_rx:
 	kfree(dma->rx_buf);
 err_release_tx:
@@ -1142,8 +1146,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 
 	if (dma->rx_chan) {
 		dmaengine_terminate_all(dma->rx_chan);
-		dma_unmap_single(p->port.dev, dma->rx_addr,
-				dma->rx_size, DMA_FROM_DEVICE);
+		dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+				 dma->rx_size, DMA_FROM_DEVICE);
 		kfree(dma->rx_buf);
 		dma_release_channel(dma->rx_chan);
 		dma->rx_chan = NULL;
@@ -1151,8 +1155,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 
 	if (dma->tx_chan) {
 		dmaengine_terminate_all(dma->tx_chan);
-		dma_unmap_single(p->port.dev, dma->tx_addr,
-				UART_XMIT_SIZE, DMA_TO_DEVICE);
+		dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
+				 UART_XMIT_SIZE, DMA_TO_DEVICE);
 		dma_release_channel(dma->tx_chan);
 		dma->tx_chan = NULL;
 	}
-- 
2.17.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v5] serial: samsung: use dma_ops of DMA if attached
  2021-06-29  4:59 ` [PATCH v5] serial: samsung: use dma_ops of DMA if attached Tamseel Shams
@ 2021-06-29  8:31   ` Marek Szyprowski
  2021-06-29  9:44   ` Krzysztof Kozlowski
  1 sibling, 0 replies; 3+ messages in thread
From: Marek Szyprowski @ 2021-06-29  8:31 UTC (permalink / raw)
  To: Tamseel Shams, krzysztof.kozlowski, gregkh, jirislaby
  Cc: linux-arm-kernel, linux-samsung-soc, linux-serial, linux-kernel,
	alim.akhtar, ajaykumar.rs, robin.murphy

On 29.06.2021 06:59, Tamseel Shams wrote:
> When DMA is used for TX and RX by serial driver, it should
> pass the DMA device pointer to DMA API instead of UART device
> pointer. DMA device should be used for DMA API because only
> the DMA device is aware of how the device connects to the memory.
> There might be an extra level of address translation due to a
> SMMU attached to the DMA device. When serial device is used for
> DMA API, the DMA API will have no clue of the SMMU attached to
> the DMA device.
>
> This patch is necessary to fix the SMMU page faults
> which is observed when a DMA(with SMMU enabled) is attached
> to UART for transfer.
>
> Signed-off-by: Tamseel Shams <m.shams@samsung.com>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
> Changes since v1:
> 1. Rebased the patch on "tty-next" branch of TTY driver tree
>
> Changes since v2:
> 1. Updated the commit message.
> 2. Changed the comment description
>
> Changes since v3:
> 1. Removed the null pointer check for "dma", "dma->tx_chan" and
> "dma->rx_chan" and instead sending DMA device pointer while calling
> DMA API.
>
> Changes since v4:
> 1. Fixed the alignments of arguments.
>
>   drivers/tty/serial/samsung_tty.c | 46 +++++++++++++++++---------------
>   1 file changed, 25 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 9fbc61151c2e..0cf4dfe77c32 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -305,8 +305,9 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
>   		dmaengine_pause(dma->tx_chan);
>   		dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
>   		dmaengine_terminate_all(dma->tx_chan);
> -		dma_sync_single_for_cpu(ourport->port.dev,
> -			dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
> +		dma_sync_single_for_cpu(dma->tx_chan->device->dev,
> +					dma->tx_transfer_addr, dma->tx_size,
> +					DMA_TO_DEVICE);
>   		async_tx_ack(dma->tx_desc);
>   		count = dma->tx_bytes_requested - state.residue;
>   		xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
> @@ -338,8 +339,9 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
>   	count = dma->tx_bytes_requested - state.residue;
>   	async_tx_ack(dma->tx_desc);
>   
> -	dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
> -				dma->tx_size, DMA_TO_DEVICE);
> +	dma_sync_single_for_cpu(dma->tx_chan->device->dev,
> +				dma->tx_transfer_addr, dma->tx_size,
> +				DMA_TO_DEVICE);
>   
>   	spin_lock_irqsave(&port->lock, flags);
>   
> @@ -443,8 +445,9 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
>   	dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
>   	dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
>   
> -	dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
> -				dma->tx_size, DMA_TO_DEVICE);
> +	dma_sync_single_for_device(dma->tx_chan->device->dev,
> +				   dma->tx_transfer_addr, dma->tx_size,
> +				   DMA_TO_DEVICE);
>   
>   	dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
>   				dma->tx_transfer_addr, dma->tx_size,
> @@ -515,7 +518,7 @@ static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
>   	if (!count)
>   		return;
>   
> -	dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
> +	dma_sync_single_for_cpu(dma->rx_chan->device->dev, dma->rx_addr,
>   				dma->rx_size, DMA_FROM_DEVICE);
>   
>   	ourport->port.icount.rx += count;
> @@ -636,8 +639,8 @@ static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
>   {
>   	struct s3c24xx_uart_dma *dma = ourport->dma;
>   
> -	dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
> -				dma->rx_size, DMA_FROM_DEVICE);
> +	dma_sync_single_for_device(dma->rx_chan->device->dev, dma->rx_addr,
> +				   dma->rx_size, DMA_FROM_DEVICE);
>   
>   	dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
>   				dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
> @@ -1102,18 +1105,19 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
>   		goto err_release_tx;
>   	}
>   
> -	dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
> -				dma->rx_size, DMA_FROM_DEVICE);
> -	if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
> +	dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
> +				      dma->rx_size, DMA_FROM_DEVICE);
> +	if (dma_mapping_error(dma->rx_chan->device->dev, dma->rx_addr)) {
>   		reason = "DMA mapping error for RX buffer";
>   		ret = -EIO;
>   		goto err_free_rx;
>   	}
>   
>   	/* TX buffer */
> -	dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
> -				UART_XMIT_SIZE, DMA_TO_DEVICE);
> -	if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
> +	dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
> +				      p->port.state->xmit.buf, UART_XMIT_SIZE,
> +				      DMA_TO_DEVICE);
> +	if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
>   		reason = "DMA mapping error for TX buffer";
>   		ret = -EIO;
>   		goto err_unmap_rx;
> @@ -1122,8 +1126,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
>   	return 0;
>   
>   err_unmap_rx:
> -	dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
> -			 DMA_FROM_DEVICE);
> +	dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
> +			 dma->rx_size, DMA_FROM_DEVICE);
>   err_free_rx:
>   	kfree(dma->rx_buf);
>   err_release_tx:
> @@ -1142,8 +1146,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
>   
>   	if (dma->rx_chan) {
>   		dmaengine_terminate_all(dma->rx_chan);
> -		dma_unmap_single(p->port.dev, dma->rx_addr,
> -				dma->rx_size, DMA_FROM_DEVICE);
> +		dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
> +				 dma->rx_size, DMA_FROM_DEVICE);
>   		kfree(dma->rx_buf);
>   		dma_release_channel(dma->rx_chan);
>   		dma->rx_chan = NULL;
> @@ -1151,8 +1155,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
>   
>   	if (dma->tx_chan) {
>   		dmaengine_terminate_all(dma->tx_chan);
> -		dma_unmap_single(p->port.dev, dma->tx_addr,
> -				UART_XMIT_SIZE, DMA_TO_DEVICE);
> +		dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
> +				 UART_XMIT_SIZE, DMA_TO_DEVICE);
>   		dma_release_channel(dma->tx_chan);
>   		dma->tx_chan = NULL;
>   	}

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v5] serial: samsung: use dma_ops of DMA if attached
  2021-06-29  4:59 ` [PATCH v5] serial: samsung: use dma_ops of DMA if attached Tamseel Shams
  2021-06-29  8:31   ` Marek Szyprowski
@ 2021-06-29  9:44   ` Krzysztof Kozlowski
  1 sibling, 0 replies; 3+ messages in thread
From: Krzysztof Kozlowski @ 2021-06-29  9:44 UTC (permalink / raw)
  To: Tamseel Shams, gregkh, jirislaby
  Cc: linux-arm-kernel, linux-samsung-soc, linux-serial, linux-kernel,
	alim.akhtar, ajaykumar.rs, robin.murphy

On 29/06/2021 06:59, Tamseel Shams wrote:
> When DMA is used for TX and RX by serial driver, it should
> pass the DMA device pointer to DMA API instead of UART device
> pointer. DMA device should be used for DMA API because only
> the DMA device is aware of how the device connects to the memory.
> There might be an extra level of address translation due to a
> SMMU attached to the DMA device. When serial device is used for
> DMA API, the DMA API will have no clue of the SMMU attached to
> the DMA device.
> 
> This patch is necessary to fix the SMMU page faults
> which is observed when a DMA(with SMMU enabled) is attached
> to UART for transfer.
> 
> Signed-off-by: Tamseel Shams <m.shams@samsung.com>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
> ---
> Changes since v1:
> 1. Rebased the patch on "tty-next" branch of TTY driver tree
> 
> Changes since v2:
> 1. Updated the commit message.
> 2. Changed the comment description
> 
> Changes since v3:
> 1. Removed the null pointer check for "dma", "dma->tx_chan" and
> "dma->rx_chan" and instead sending DMA device pointer while calling
> DMA API.
> 
> Changes since v4:
> 1. Fixed the alignments of arguments.
> 
>  drivers/tty/serial/samsung_tty.c | 46 +++++++++++++++++---------------
>  1 file changed, 25 insertions(+), 21 deletions(-)
> 


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>


Best regards,
Krzysztof

^ permalink raw reply	[flat|nested] 3+ messages in thread

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Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-29  4:59 ` [PATCH v5] serial: samsung: use dma_ops of DMA if attached Tamseel Shams
2021-06-29  8:31   ` Marek Szyprowski
2021-06-29  9:44   ` Krzysztof Kozlowski

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