6.1-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner tglx@linutronix.de
[ Upstream commit 68ca3e72d7463d79d29b6e4961d6028df2a88e25 ]
When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console.
So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress.
All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure.
To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms.
Converted with coccinelle. No functional change.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: John Ogness john.ogness@linutronix.de Link: https://lore.kernel.org/r/20230914183831.587273-18-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 2bcacc1c87ac ("serial: amba-pl011: Fix RX stall when DMA is used") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/tty/serial/amba-pl011.c | 72 ++++++++++++++++----------------- 1 file changed, 36 insertions(+), 36 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 2f0f05259778a..c95351d24f363 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -346,9 +346,9 @@ static int pl011_fifo_to_tty(struct uart_amba_port *uap) flag = TTY_FRAME; }
- spin_unlock(&uap->port.lock); + uart_port_unlock(&uap->port); sysrq = uart_handle_sysrq_char(&uap->port, ch & 255); - spin_lock(&uap->port.lock); + uart_port_lock(&uap->port);
if (!sysrq) uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag); @@ -543,7 +543,7 @@ static void pl011_dma_tx_callback(void *data) unsigned long flags; u16 dmacr;
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags); if (uap->dmatx.queued) dma_unmap_single(dmatx->chan->device->dev, dmatx->dma, dmatx->len, DMA_TO_DEVICE); @@ -564,7 +564,7 @@ static void pl011_dma_tx_callback(void *data) if (!(dmacr & UART011_TXDMAE) || uart_tx_stopped(&uap->port) || uart_circ_empty(&uap->port.state->xmit)) { uap->dmatx.queued = false; - spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags); return; }
@@ -575,7 +575,7 @@ static void pl011_dma_tx_callback(void *data) */ pl011_start_tx_pio(uap);
- spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags); }
/* @@ -1004,7 +1004,7 @@ static void pl011_dma_rx_callback(void *data) * routine to flush out the secondary DMA buffer while * we immediately trigger the next DMA job. */ - spin_lock_irq(&uap->port.lock); + uart_port_lock_irq(&uap->port); /* * Rx data can be taken by the UART interrupts during * the DMA irq handler. So we check the residue here. @@ -1020,7 +1020,7 @@ static void pl011_dma_rx_callback(void *data) ret = pl011_dma_rx_trigger_dma(uap);
pl011_dma_rx_chars(uap, pending, lastbuf, false); - spin_unlock_irq(&uap->port.lock); + uart_port_unlock_irq(&uap->port); /* * Do this check after we picked the DMA chars so we don't * get some IRQ immediately from RX. @@ -1086,11 +1086,11 @@ static void pl011_dma_rx_poll(struct timer_list *t) if (jiffies_to_msecs(jiffies - dmarx->last_jiffies) > uap->dmarx.poll_timeout) {
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags); pl011_dma_rx_stop(uap); uap->im |= UART011_RXIM; pl011_write(uap->im, uap, REG_IMSC); - spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags);
uap->dmarx.running = false; dmaengine_terminate_all(rxchan); @@ -1186,10 +1186,10 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap) while (pl011_read(uap, REG_FR) & uap->vendor->fr_busy) cpu_relax();
- spin_lock_irq(&uap->port.lock); + uart_port_lock_irq(&uap->port); uap->dmacr &= ~(UART011_DMAONERR | UART011_RXDMAE | UART011_TXDMAE); pl011_write(uap->dmacr, uap, REG_DMACR); - spin_unlock_irq(&uap->port.lock); + uart_port_unlock_irq(&uap->port);
if (uap->using_tx_dma) { /* In theory, this should already be done by pl011_dma_flush_buffer */ @@ -1400,9 +1400,9 @@ static void pl011_throttle_rx(struct uart_port *port) { unsigned long flags;
- spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); pl011_stop_rx(port); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); }
static void pl011_enable_ms(struct uart_port *port) @@ -1420,7 +1420,7 @@ __acquires(&uap->port.lock) { pl011_fifo_to_tty(uap);
- spin_unlock(&uap->port.lock); + uart_port_unlock(&uap->port); tty_flip_buffer_push(&uap->port.state->port); /* * If we were temporarily out of DMA mode for a while, @@ -1445,7 +1445,7 @@ __acquires(&uap->port.lock) #endif } } - spin_lock(&uap->port.lock); + uart_port_lock(&uap->port); }
static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c, @@ -1551,7 +1551,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id) unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; int handled = 0;
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags); status = pl011_read(uap, REG_RIS) & uap->im; if (status) { do { @@ -1581,7 +1581,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id) handled = 1; }
- spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags);
return IRQ_RETVAL(handled); } @@ -1653,14 +1653,14 @@ static void pl011_break_ctl(struct uart_port *port, int break_state) unsigned long flags; unsigned int lcr_h;
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags); lcr_h = pl011_read(uap, REG_LCRH_TX); if (break_state == -1) lcr_h |= UART01x_LCRH_BRK; else lcr_h &= ~UART01x_LCRH_BRK; pl011_write(lcr_h, uap, REG_LCRH_TX); - spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags); }
#ifdef CONFIG_CONSOLE_POLL @@ -1799,7 +1799,7 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap) unsigned long flags; unsigned int i;
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags);
/* Clear out any spuriously appearing RX interrupts */ pl011_write(UART011_RTIS | UART011_RXIS, uap, REG_ICR); @@ -1821,7 +1821,7 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap) if (!pl011_dma_rx_running(uap)) uap->im |= UART011_RXIM; pl011_write(uap->im, uap, REG_IMSC); - spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags); }
static void pl011_unthrottle_rx(struct uart_port *port) @@ -1829,7 +1829,7 @@ static void pl011_unthrottle_rx(struct uart_port *port) struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port); unsigned long flags;
- spin_lock_irqsave(&uap->port.lock, flags); + uart_port_lock_irqsave(&uap->port, &flags);
uap->im = UART011_RTIM; if (!pl011_dma_rx_running(uap)) @@ -1837,7 +1837,7 @@ static void pl011_unthrottle_rx(struct uart_port *port)
pl011_write(uap->im, uap, REG_IMSC);
- spin_unlock_irqrestore(&uap->port.lock, flags); + uart_port_unlock_irqrestore(&uap->port, flags); }
static int pl011_startup(struct uart_port *port) @@ -1857,7 +1857,7 @@ static int pl011_startup(struct uart_port *port)
pl011_write(uap->vendor->ifls, uap, REG_IFLS);
- spin_lock_irq(&uap->port.lock); + uart_port_lock_irq(&uap->port);
cr = pl011_read(uap, REG_CR); cr &= UART011_CR_RTS | UART011_CR_DTR; @@ -1868,7 +1868,7 @@ static int pl011_startup(struct uart_port *port)
pl011_write(cr, uap, REG_CR);
- spin_unlock_irq(&uap->port.lock); + uart_port_unlock_irq(&uap->port);
/* * initialise the old status of the modem signals @@ -1929,12 +1929,12 @@ static void pl011_disable_uart(struct uart_amba_port *uap) unsigned int cr;
uap->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS); - spin_lock_irq(&uap->port.lock); + uart_port_lock_irq(&uap->port); cr = pl011_read(uap, REG_CR); cr &= UART011_CR_RTS | UART011_CR_DTR; cr |= UART01x_CR_UARTEN | UART011_CR_TXE; pl011_write(cr, uap, REG_CR); - spin_unlock_irq(&uap->port.lock); + uart_port_unlock_irq(&uap->port);
/* * disable break condition and fifos @@ -1946,14 +1946,14 @@ static void pl011_disable_uart(struct uart_amba_port *uap)
static void pl011_disable_interrupts(struct uart_amba_port *uap) { - spin_lock_irq(&uap->port.lock); + uart_port_lock_irq(&uap->port);
/* mask all interrupts and clear all pending ones */ uap->im = 0; pl011_write(uap->im, uap, REG_IMSC); pl011_write(0xffff, uap, REG_ICR);
- spin_unlock_irq(&uap->port.lock); + uart_port_unlock_irq(&uap->port); }
static void pl011_shutdown(struct uart_port *port) @@ -2098,7 +2098,7 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
bits = tty_get_frame_size(termios->c_cflag);
- spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags);
/* * Update the per-port timeout. @@ -2165,7 +2165,7 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios, pl011_write_lcr_h(uap, lcr_h); pl011_write(old_cr, uap, REG_CR);
- spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); }
static void @@ -2183,10 +2183,10 @@ sbsa_uart_set_termios(struct uart_port *port, struct ktermios *termios, termios->c_cflag &= ~(CMSPAR | CRTSCTS); termios->c_cflag |= CS8 | CLOCAL;
- spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); uart_update_timeout(port, CS8, uap->fixed_baud); pl011_setup_status_masks(port, termios); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); }
static const char *pl011_type(struct uart_port *port) @@ -2325,9 +2325,9 @@ pl011_console_write(struct console *co, const char *s, unsigned int count) if (uap->port.sysrq) locked = 0; else if (oops_in_progress) - locked = spin_trylock(&uap->port.lock); + locked = uart_port_trylock(&uap->port); else - spin_lock(&uap->port.lock); + uart_port_lock(&uap->port);
/* * First save the CR then disable the interrupts @@ -2353,7 +2353,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count) pl011_write(old_cr, uap, REG_CR);
if (locked) - spin_unlock(&uap->port.lock); + uart_port_unlock(&uap->port); local_irq_restore(flags);
clk_disable(uap->clk);