From: Michael Walle <michael@walle.cc>
To: linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Jiri Slaby <jslaby@suse.com>, Peng Fan <peng.fan@nxp.com>,
Vabhav Sharma <vabhav.sharma@nxp.com>,
Michael Walle <michael@walle.cc>
Subject: [PATCH v2 4/9] tty: serial: fsl_lpuart: fix DMA mapping
Date: Fri, 21 Feb 2020 18:47:49 +0100 [thread overview]
Message-ID: <20200221174754.5295-5-michael@walle.cc> (raw)
In-Reply-To: <20200221174754.5295-1-michael@walle.cc>
Use the correct device to request the DMA mapping. Otherwise the IOMMU
doesn't get the mapping and it will generate a page fault.
The error messages look like:
[ 19.012140] arm-smmu 5000000.iommu: Unhandled context fault: fsr=0x402, iova=0xbbfff800, fsynr=0x3e0021, cbfrsynra=0x828, cb=9
[ 19.023593] arm-smmu 5000000.iommu: Unhandled context fault: fsr=0x402, iova=0xbbfff800, fsynr=0x3e0021, cbfrsynra=0x828, cb=9
This was tested on a custom board with a LS1028A SoC.
Signed-off-by: Michael Walle <michael@walle.cc>
---
drivers/tty/serial/fsl_lpuart.c | 47 +++++++++++++++++++--------------
1 file changed, 27 insertions(+), 20 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index fd9f60d0817a..b65db29a1cd0 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -409,6 +409,7 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
struct circ_buf *xmit = &sport->port.state->xmit;
struct scatterlist *sgl = sport->tx_sgl;
struct device *dev = sport->port.dev;
+ struct dma_chan *chan = sport->dma_tx_chan;
int ret;
if (sport->dma_tx_in_progress)
@@ -427,17 +428,18 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
sg_set_buf(sgl + 1, xmit->buf, xmit->head);
}
- ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ ret = dma_map_sg(chan->device->dev, sgl, sport->dma_tx_nents,
+ DMA_TO_DEVICE);
if (!ret) {
dev_err(dev, "DMA mapping error for TX.\n");
return;
}
- sport->dma_tx_desc = dmaengine_prep_slave_sg(sport->dma_tx_chan, sgl,
+ sport->dma_tx_desc = dmaengine_prep_slave_sg(chan, sgl,
ret, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
if (!sport->dma_tx_desc) {
- dma_unmap_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ dma_unmap_sg(chan->device->dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
dev_err(dev, "Cannot prepare TX slave DMA!\n");
return;
}
@@ -446,7 +448,7 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
sport->dma_tx_desc->callback_param = sport;
sport->dma_tx_in_progress = true;
sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
- dma_async_issue_pending(sport->dma_tx_chan);
+ dma_async_issue_pending(chan);
}
static bool lpuart_stopped_or_empty(struct uart_port *port)
@@ -459,11 +461,13 @@ static void lpuart_dma_tx_complete(void *arg)
struct lpuart_port *sport = arg;
struct scatterlist *sgl = &sport->tx_sgl[0];
struct circ_buf *xmit = &sport->port.state->xmit;
+ struct dma_chan *chan = sport->dma_tx_chan;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
- dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
+ dma_unmap_sg(chan->device->dev, sgl, sport->dma_tx_nents,
+ DMA_TO_DEVICE);
xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1);
@@ -529,15 +533,16 @@ static bool lpuart_is_32(struct lpuart_port *sport)
static void lpuart_flush_buffer(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+ struct dma_chan *chan = sport->dma_tx_chan;
u32 val;
if (sport->lpuart_dma_tx_use) {
if (sport->dma_tx_in_progress) {
- dma_unmap_sg(sport->port.dev, &sport->tx_sgl[0],
+ dma_unmap_sg(chan->device->dev, &sport->tx_sgl[0],
sport->dma_tx_nents, DMA_TO_DEVICE);
sport->dma_tx_in_progress = false;
}
- dmaengine_terminate_all(sport->dma_tx_chan);
+ dmaengine_terminate_all(chan);
}
if (lpuart_is_32(sport)) {
@@ -993,6 +998,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
struct tty_port *port = &sport->port.state->port;
struct dma_tx_state state;
enum dma_status dmastat;
+ struct dma_chan *chan = sport->dma_rx_chan;
struct circ_buf *ring = &sport->rx_ring;
unsigned long flags;
int count = 0;
@@ -1053,10 +1059,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
spin_lock_irqsave(&sport->port.lock, flags);
- dmastat = dmaengine_tx_status(sport->dma_rx_chan,
- sport->dma_rx_cookie,
- &state);
-
+ dmastat = dmaengine_tx_status(chan, sport->dma_rx_cookie, &state);
if (dmastat == DMA_ERROR) {
dev_err(sport->port.dev, "Rx DMA transfer failed!\n");
spin_unlock_irqrestore(&sport->port.lock, flags);
@@ -1064,7 +1067,8 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
}
/* CPU claims ownership of RX DMA buffer */
- dma_sync_sg_for_cpu(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+ dma_sync_sg_for_cpu(chan->device->dev, &sport->rx_sgl, 1,
+ DMA_FROM_DEVICE);
/*
* ring->head points to the end of data already written by the DMA.
@@ -1106,7 +1110,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
sport->port.icount.rx += count;
}
- dma_sync_sg_for_device(sport->port.dev, &sport->rx_sgl, 1,
+ dma_sync_sg_for_device(chan->device->dev, &sport->rx_sgl, 1,
DMA_FROM_DEVICE);
spin_unlock_irqrestore(&sport->port.lock, flags);
@@ -1138,6 +1142,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
struct tty_port *port = &sport->port.state->port;
struct tty_struct *tty = port->tty;
struct ktermios *termios = &tty->termios;
+ struct dma_chan *chan = sport->dma_rx_chan;
baud = tty_get_baud_rate(tty);
@@ -1159,7 +1164,8 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
return -ENOMEM;
sg_init_one(&sport->rx_sgl, ring->buf, sport->rx_dma_rng_buf_len);
- nent = dma_map_sg(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+ nent = dma_map_sg(chan->device->dev, &sport->rx_sgl, 1,
+ DMA_FROM_DEVICE);
if (!nent) {
dev_err(sport->port.dev, "DMA Rx mapping error\n");
@@ -1170,7 +1176,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_rx_sconfig.src_maxburst = 1;
dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
- ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
+ ret = dmaengine_slave_config(chan, &dma_rx_sconfig);
if (ret < 0) {
dev_err(sport->port.dev,
@@ -1178,7 +1184,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
return ret;
}
- sport->dma_rx_desc = dmaengine_prep_dma_cyclic(sport->dma_rx_chan,
+ sport->dma_rx_desc = dmaengine_prep_dma_cyclic(chan,
sg_dma_address(&sport->rx_sgl),
sport->rx_sgl.length,
sport->rx_sgl.length / 2,
@@ -1192,7 +1198,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
sport->dma_rx_desc->callback_param = sport;
sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
- dma_async_issue_pending(sport->dma_rx_chan);
+ dma_async_issue_pending(chan);
if (lpuart_is_32(sport)) {
unsigned long temp = lpuart32_read(&sport->port, UARTBAUD);
@@ -1210,11 +1216,12 @@ static void lpuart_dma_rx_free(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
+ struct dma_chan *chan = sport->dma_rx_chan;
- if (sport->dma_rx_chan)
- dmaengine_terminate_all(sport->dma_rx_chan);
+ if (chan)
+ dmaengine_terminate_all(chan);
- dma_unmap_sg(sport->port.dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
+ dma_unmap_sg(chan->device->dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
kfree(sport->rx_ring.buf);
sport->rx_ring.tail = 0;
sport->rx_ring.head = 0;
--
2.20.1
next prev parent reply other threads:[~2020-02-21 17:48 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-21 17:47 [PATCH v2 0/9] tty: serial: fsl_lpuart various fixes and LS1028A support Michael Walle
2020-02-21 17:47 ` [PATCH v2 1/9] Revert "tty: serial: fsl_lpuart: drop EARLYCON_DECLARE" Michael Walle
2020-02-21 17:47 ` [PATCH v2 2/9] tty: serial: fsl_lpuart: free IDs allocated by IDA Michael Walle
2020-02-21 17:47 ` [PATCH v2 3/9] tty: serial: fsl_lpuart: handle EPROBE_DEFER for DMA Michael Walle
2020-02-27 22:34 ` Rob Herring
2020-02-27 22:48 ` Li Yang
2020-02-27 23:03 ` Rob Herring
2020-02-28 11:46 ` Michael Walle
2020-02-28 21:50 ` Michael Walle
2020-02-28 21:53 ` Li Yang
2020-02-21 17:47 ` Michael Walle [this message]
2020-02-21 17:47 ` [PATCH v2 5/9] dt-bindings: serial: lpuart: add ls1028a compatibility Michael Walle
2020-02-26 21:37 ` Rob Herring
2020-02-21 17:47 ` [PATCH v2 6/9] tty: serial: fsl_lpuart: add LS1028A support Michael Walle
2020-02-21 17:47 ` [PATCH v2 7/9] tty: serial: fsl_lpuart: add LS1028A earlycon support Michael Walle
2020-02-21 17:47 ` [PATCH v2 8/9] arm64: dts: ls1028a: add "fsl,vf610-edma" compatible Michael Walle
2020-02-21 17:47 ` [PATCH v2 9/9] arm64: dts: ls1028a: add missing LPUART nodes Michael Walle
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