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MPSC serial driver tx locking 

The MPSC serial driver assumes that interrupt is always on to pick up the
DMA transmit ops that aren't submitted while the DMA engine is active.
However when irqs are off for a period of time such as operations under
kernel crash dump console messages do not show up due to additional DMA ops
are being dropped.  This makes console writes to process through all the tx
DMAs queued up before submitting a new request.

Also, the current locking mechanism does not protect the hardware registers
and ring buffer when a printk is done during the serial write operations.
The additional per port transmit lock provides a finer granular locking and
protects registers being clobbered while printks are nested within UART
writes.

Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Jiang 2007-05-06 14:48:50 -07:00 committed by Linus Torvalds
parent abb4a23907
commit 1733310bb7
1 changed files with 24 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/serial/mpsc.c
View File

@ -183,6 +183,7 @@ struct mpsc_port_info {
u8 *txb_p; /* Phys addr of txb */
int txr_head; /* Where new data goes */
int txr_tail; /* Where sent data comes off */
spinlock_t tx_lock; /* transmit lock */
/* Mirrored values of regs we can't read (if 'mirror_regs' set) */
u32 MPSC_MPCR_m;
@ -1212,6 +1213,9 @@ mpsc_tx_intr(struct mpsc_port_info *pi)
{
struct mpsc_tx_desc *txre;
int rc = 0;
unsigned long iflags;
spin_lock_irqsave(&pi->tx_lock, iflags);
if (!mpsc_sdma_tx_active(pi)) {
txre = (struct mpsc_tx_desc *)(pi->txr +
@ -1248,6 +1252,7 @@ mpsc_tx_intr(struct mpsc_port_info *pi)
mpsc_sdma_start_tx(pi); /* start next desc if ready */
}
spin_unlock_irqrestore(&pi->tx_lock, iflags);
return rc;
}
@ -1338,11 +1343,16 @@ static void
mpsc_start_tx(struct uart_port *port)
{
struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
unsigned long iflags;
spin_lock_irqsave(&pi->tx_lock, iflags);
mpsc_unfreeze(pi);
mpsc_copy_tx_data(pi);
mpsc_sdma_start_tx(pi);
spin_unlock_irqrestore(&pi->tx_lock, iflags);
pr_debug("mpsc_start_tx[%d]\n", port->line);
return;
}
@ -1625,6 +1635,16 @@ mpsc_console_write(struct console *co, const char *s, uint count)
struct mpsc_port_info *pi = &mpsc_ports[co->index];
u8 *bp, *dp, add_cr = 0;
int i;
unsigned long iflags;
spin_lock_irqsave(&pi->tx_lock, iflags);
while (pi->txr_head != pi->txr_tail) {
while (mpsc_sdma_tx_active(pi))
udelay(100);
mpsc_sdma_intr_ack(pi);
mpsc_tx_intr(pi);
}
while (mpsc_sdma_tx_active(pi))
udelay(100);
@ -1668,6 +1688,7 @@ mpsc_console_write(struct console *co, const char *s, uint count)
pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
}
spin_unlock_irqrestore(&pi->tx_lock, iflags);
return;
}
@ -2005,7 +2026,8 @@ mpsc_drv_probe(struct platform_device *dev)
if (!(rc = mpsc_drv_map_regs(pi, dev))) {
mpsc_drv_get_platform_data(pi, dev, dev->id);
if (!(rc = mpsc_make_ready(pi)))
if (!(rc = mpsc_make_ready(pi))) {
spin_lock_init(&pi->tx_lock);
if (!(rc = uart_add_one_port(&mpsc_reg,
&pi->port)))
rc = 0;
@ -2014,6 +2036,7 @@ mpsc_drv_probe(struct platform_device *dev)
(struct uart_port *)pi);
mpsc_drv_unmap_regs(pi);
}
}
else
mpsc_drv_unmap_regs(pi);
}