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serial: samsung: use dma_ops of DMA if attached

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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.

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Tamseel Shams <m.shams@samsung.com>
Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Link: https://lore.kernel.org/r/20210629045902.48912-1-m.shams@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tamseel Shams 2021-06-29 10:29:02 +05:30 committed by Greg Kroah-Hartman
parent b0819465be
commit 4fc2d3cd6d
1 changed files with 25 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/tty/serial/samsung_tty.c
View File

@ -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;
}