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drivers/serial/serial.c: adapt to the iovec-based api #14898

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drivers/serial/serial.c: adapt to the iovec-based api #14898

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2ef0982
Update a few comments after the recent readv/writev changes
yamt Nov 21, 2024
e8e16f8
Make readv/writev implementations update struct uio
yamt Nov 21, 2024
1b1fbc4
rename uio_total_len to uio_resid
yamt Nov 22, 2024
9cd9923
add uio_copyfrom/uio_copyto
yamt Nov 21, 2024
7e31a26
drivers/serial/serial.c: adapt to the iovec-based api
yamt Nov 21, 2024
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105 changes: 83 additions & 22 deletions drivers/serial/serial.c
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,8 @@ static int uart_putxmitchar(FAR uart_dev_t *dev, int ch,
static inline ssize_t uart_irqwrite(FAR uart_dev_t *dev,
FAR const char *buffer,
size_t buflen);
static inline ssize_t uart_irqwritev(FAR uart_dev_t *dev,
FAR struct uio *uio);
static int uart_tcdrain(FAR uart_dev_t *dev,
bool cancelable, clock_t timeout);

Expand All @@ -110,11 +112,8 @@ static int uart_tcsendbreak(FAR uart_dev_t *dev,

static int uart_open(FAR struct file *filep);
static int uart_close(FAR struct file *filep);
static ssize_t uart_read(FAR struct file *filep,
FAR char *buffer, size_t buflen);
static ssize_t uart_write(FAR struct file *filep,
FAR const char *buffer,
size_t buflen);
static ssize_t uart_readv(FAR struct file *filep, FAR struct uio *uio);
static ssize_t uart_writev(FAR struct file *filep, FAR struct uio *uio);
static int uart_ioctl(FAR struct file *filep,
int cmd, unsigned long arg);
static int uart_poll(FAR struct file *filep,
Expand All @@ -141,15 +140,15 @@ static const struct file_operations g_serialops =
{
uart_open, /* open */
uart_close, /* close */
uart_read, /* read */
uart_write, /* write */
NULL, /* read */
NULL, /* write */
NULL, /* seek */
uart_ioctl, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
uart_poll, /* poll */
NULL, /* readv */
NULL /* writev */
uart_readv, /* readv */
uart_writev /* writev */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, uart_unlink /* unlink */
#endif
Expand Down Expand Up @@ -441,6 +440,50 @@ static inline ssize_t uart_irqwrite(FAR uart_dev_t *dev,
return buflen;
}

/****************************************************************************
* Name: uart_irqwritev
****************************************************************************/

static inline ssize_t uart_irqwritev(FAR uart_dev_t *dev,
FAR struct uio *uio)
{
ssize_t error = 0;
ssize_t total = 0;
int iovcnt = uio->uio_iovcnt;
int i;

for (i = 0; i < iovcnt; i++)
{
const struct iovec *iov = &uio->uio_iov[i];
if (iov->iov_len == 0)
{
continue;
}

ssize_t written = uart_irqwrite(dev, iov->iov_base, iov->iov_len);
if (written < 0)
{
error = written;
break;
}

if (SSIZE_MAX - total < written)
{
error = -EOVERFLOW;
break;
}

total += written;
}

if (error != 0 && total == 0)
{
return error;
}

return total;
}

/****************************************************************************
* Name: uart_tcdrain
*
Expand Down Expand Up @@ -847,11 +890,10 @@ static int uart_close(FAR struct file *filep)
}

/****************************************************************************
* Name: uart_read
* Name: uart_readv
****************************************************************************/

static ssize_t uart_read(FAR struct file *filep,
FAR char *buffer, size_t buflen)
static ssize_t uart_readv(FAR struct file *filep, FAR struct uio *uio)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
Expand All @@ -862,11 +904,18 @@ static ssize_t uart_read(FAR struct file *filep,
#endif
irqstate_t flags;
ssize_t recvd = 0;
ssize_t buflen;
bool echoed = false;
int16_t tail;
char ch;
int ret;

buflen = uio_resid(uio);
if (buflen < 0)
{
return buflen;
}

/* Only one user can access rxbuf->tail at a time */

ret = nxmutex_lock(&dev->recv.lock);
Expand All @@ -885,7 +934,7 @@ static ssize_t uart_read(FAR struct file *filep,
* data from the end of the buffer.
*/

while ((size_t)recvd < buflen)
while (recvd < buflen)
{
#ifdef CONFIG_SERIAL_REMOVABLE
/* If the removable device is no longer connected, refuse to read any
Expand Down Expand Up @@ -961,7 +1010,8 @@ static ssize_t uart_read(FAR struct file *filep,
{
if (recvd > 0)
{
*buffer-- = '\0';
static const char zero = '\0';
uio_copyfrom(uio, recvd, &zero, 1);
recvd--;
if (dev->tc_lflag & ECHO)
{
Expand Down Expand Up @@ -990,7 +1040,7 @@ static ssize_t uart_read(FAR struct file *filep,

/* Store the received character */

*buffer++ = ch;
uio_copyfrom(uio, recvd, &ch, 1);
recvd++;

if (dev->tc_lflag & ECHO)
Expand Down Expand Up @@ -1325,19 +1375,24 @@ static ssize_t uart_read(FAR struct file *filep,
#endif

nxmutex_unlock(&dev->recv.lock);
if (recvd >= 0)
{
uio_advance(uio, recvd);
}

return recvd;
}

/****************************************************************************
* Name: uart_write
* Name: uart_writev
****************************************************************************/

static ssize_t uart_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
static ssize_t uart_writev(FAR struct file *filep, FAR struct uio *uio)
{
FAR struct inode *inode = filep->f_inode;
FAR uart_dev_t *dev = inode->i_private;
ssize_t nwritten = buflen;
ssize_t nwritten;
ssize_t buflen;
bool oktoblock;
int ret;
char ch;
Expand All @@ -1363,12 +1418,18 @@ static ssize_t uart_write(FAR struct file *filep, FAR const char *buffer,
#endif

flags = enter_critical_section();
ret = uart_irqwrite(dev, buffer, buflen);
ret = uart_irqwritev(dev, uio);
leave_critical_section(flags);

return ret;
}

buflen = nwritten = uio_resid(uio);
if (nwritten < 0)
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why add the additional check

{
return nwritten;
}

/* Only one user can access dev->xmit.head at a time */

ret = nxmutex_lock(&dev->xmit.lock);
Expand Down Expand Up @@ -1408,9 +1469,9 @@ static ssize_t uart_write(FAR struct file *filep, FAR const char *buffer,
*/

uart_disabletxint(dev);
for (; buflen; buflen--)
for (; buflen; uio_advance(uio, 1), buflen--)
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merge line 1474

{
ch = *buffer++;
uio_copyto(uio, 0, &ch, 1);
ret = OK;

/* Do output post-processing */
Expand Down
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