diff options
Diffstat (limited to 'drivers/tty')
37 files changed, 1467 insertions, 1006 deletions
diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile index b95bed92da9f..f02becdb3e33 100644 --- a/drivers/tty/Makefile +++ b/drivers/tty/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_TTY) += tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \ - tty_buffer.o tty_port.o tty_mutex.o tty_ldsem.o + tty_buffer.o tty_port.o tty_mutex.o \ + tty_ldsem.o tty_baudrate.o tty_jobctrl.o obj-$(CONFIG_LEGACY_PTYS) += pty.o obj-$(CONFIG_UNIX98_PTYS) += pty.o obj-$(CONFIG_AUDIT) += tty_audit.o diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c index b19ae36a05ec..a8d399188242 100644 --- a/drivers/tty/hvc/hvc_console.c +++ b/drivers/tty/hvc/hvc_console.c @@ -920,17 +920,17 @@ int hvc_remove(struct hvc_struct *hp) tty = tty_port_tty_get(&hp->port); + console_lock(); spin_lock_irqsave(&hp->lock, flags); if (hp->index < MAX_NR_HVC_CONSOLES) { - console_lock(); vtermnos[hp->index] = -1; cons_ops[hp->index] = NULL; - console_unlock(); } /* Don't whack hp->irq because tty_hangup() will need to free the irq. */ spin_unlock_irqrestore(&hp->lock, flags); + console_unlock(); /* * We 'put' the instance that was grabbed when the kref instance diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c index 7823d6d998cf..99bb875178d7 100644 --- a/drivers/tty/hvc/hvcs.c +++ b/drivers/tty/hvc/hvcs.c @@ -1575,7 +1575,7 @@ static int __init hvcs_module_init(void) */ rc = driver_create_file(&(hvcs_vio_driver.driver), &driver_attr_rescan); if (rc) - pr_warning("HVCS: Failed to create rescan file (err %d)\n", rc); + pr_warn("HVCS: Failed to create rescan file (err %d)\n", rc); return 0; } diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 55577cf9b6a4..2667a205a5ab 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -89,18 +89,14 @@ module_param(debug, int, 0600); /** * struct gsm_mux_net - network interface * @struct gsm_dlci* dlci - * @struct net_device_stats stats; * * Created when net interface is initialized. **/ struct gsm_mux_net { struct kref ref; struct gsm_dlci *dlci; - struct net_device_stats stats; }; -#define STATS(net) (((struct gsm_mux_net *)netdev_priv(net))->stats) - /* * Each block of data we have queued to go out is in the form of * a gsm_msg which holds everything we need in a link layer independent @@ -2613,10 +2609,6 @@ static int gsm_mux_net_close(struct net_device *net) return 0; } -static struct net_device_stats *gsm_mux_net_get_stats(struct net_device *net) -{ - return &((struct gsm_mux_net *)netdev_priv(net))->stats; -} static void dlci_net_free(struct gsm_dlci *dlci) { if (!dlci->net) { @@ -2660,8 +2652,8 @@ static int gsm_mux_net_start_xmit(struct sk_buff *skb, muxnet_get(mux_net); skb_queue_head(&dlci->skb_list, skb); - STATS(net).tx_packets++; - STATS(net).tx_bytes += skb->len; + net->stats.tx_packets++; + net->stats.tx_bytes += skb->len; gsm_dlci_data_kick(dlci); /* And tell the kernel when the last transmit started. */ netif_trans_update(net); @@ -2676,7 +2668,7 @@ static void gsm_mux_net_tx_timeout(struct net_device *net) dev_dbg(&net->dev, "Tx timed out.\n"); /* Update statistics */ - STATS(net).tx_errors++; + net->stats.tx_errors++; } static void gsm_mux_rx_netchar(struct gsm_dlci *dlci, @@ -2691,7 +2683,7 @@ static void gsm_mux_rx_netchar(struct gsm_dlci *dlci, skb = dev_alloc_skb(size + NET_IP_ALIGN); if (!skb) { /* We got no receive buffer. */ - STATS(net).rx_dropped++; + net->stats.rx_dropped++; muxnet_put(mux_net); return; } @@ -2705,8 +2697,8 @@ static void gsm_mux_rx_netchar(struct gsm_dlci *dlci, netif_rx(skb); /* update out statistics */ - STATS(net).rx_packets++; - STATS(net).rx_bytes += size; + net->stats.rx_packets++; + net->stats.rx_bytes += size; muxnet_put(mux_net); return; } @@ -2718,7 +2710,6 @@ static void gsm_mux_net_init(struct net_device *net) .ndo_stop = gsm_mux_net_close, .ndo_start_xmit = gsm_mux_net_start_xmit, .ndo_tx_timeout = gsm_mux_net_tx_timeout, - .ndo_get_stats = gsm_mux_net_get_stats, }; net->netdev_ops = &gsm_netdev_ops; diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 66b59a15780d..65799575c666 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -216,16 +216,11 @@ static int pty_signal(struct tty_struct *tty, int sig) static void pty_flush_buffer(struct tty_struct *tty) { struct tty_struct *to = tty->link; - struct tty_ldisc *ld; if (!to) return; - ld = tty_ldisc_ref(to); - tty_buffer_flush(to, ld); - if (ld) - tty_ldisc_deref(ld); - + tty_buffer_flush(to, NULL); if (to->packet) { spin_lock_irq(&tty->ctrl_lock); tty->ctrl_status |= TIOCPKT_FLUSHWRITE; diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c index 1c4829a56351..433de5ea9b02 100644 --- a/drivers/tty/serdev/core.c +++ b/drivers/tty/serdev/core.c @@ -116,17 +116,41 @@ void serdev_device_close(struct serdev_device *serdev) } EXPORT_SYMBOL_GPL(serdev_device_close); -int serdev_device_write_buf(struct serdev_device *serdev, - const unsigned char *buf, size_t count) +void serdev_device_write_wakeup(struct serdev_device *serdev) +{ + complete(&serdev->write_comp); +} +EXPORT_SYMBOL_GPL(serdev_device_write_wakeup); + +int serdev_device_write(struct serdev_device *serdev, + const unsigned char *buf, size_t count, + unsigned long timeout) { struct serdev_controller *ctrl = serdev->ctrl; + int ret; - if (!ctrl || !ctrl->ops->write_buf) + if (!ctrl || !ctrl->ops->write_buf || + (timeout && !serdev->ops->write_wakeup)) return -EINVAL; - return ctrl->ops->write_buf(ctrl, buf, count); + mutex_lock(&serdev->write_lock); + do { + reinit_completion(&serdev->write_comp); + + ret = ctrl->ops->write_buf(ctrl, buf, count); + if (ret < 0) + break; + + buf += ret; + count -= ret; + + } while (count && + (timeout = wait_for_completion_timeout(&serdev->write_comp, + timeout))); + mutex_unlock(&serdev->write_lock); + return ret < 0 ? ret : (count ? -ETIMEDOUT : 0); } -EXPORT_SYMBOL_GPL(serdev_device_write_buf); +EXPORT_SYMBOL_GPL(serdev_device_write); void serdev_device_write_flush(struct serdev_device *serdev) { @@ -262,6 +286,8 @@ struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl) serdev->dev.parent = &ctrl->dev; serdev->dev.bus = &serdev_bus_type; serdev->dev.type = &serdev_device_type; + init_completion(&serdev->write_comp); + mutex_init(&serdev->write_lock); return serdev; } EXPORT_SYMBOL_GPL(serdev_device_alloc); diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 76e03a7de9cc..48a07e2f617f 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -218,7 +218,7 @@ static int serial_link_irq_chain(struct uart_8250_port *up) spin_unlock_irq(&i->lock); irq_flags |= up->port.irqflags; ret = request_irq(up->port.irq, serial8250_interrupt, - irq_flags, "serial", i); + irq_flags, up->port.name, i); if (ret < 0) serial_do_unlink(i, up); } diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index e65808c482f1..787b1160d3a5 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -530,12 +530,11 @@ static int dw8250_probe(struct platform_device *pdev) } data->rst = devm_reset_control_get_optional(dev, NULL); - if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) { - err = -EPROBE_DEFER; + if (IS_ERR(data->rst)) { + err = PTR_ERR(data->rst); goto err_pclk; } - if (!IS_ERR(data->rst)) - reset_control_deassert(data->rst); + reset_control_deassert(data->rst); dw8250_quirks(p, data); @@ -567,8 +566,7 @@ static int dw8250_probe(struct platform_device *pdev) return 0; err_reset: - if (!IS_ERR(data->rst)) - reset_control_assert(data->rst); + reset_control_assert(data->rst); err_pclk: if (!IS_ERR(data->pclk)) @@ -589,8 +587,7 @@ static int dw8250_remove(struct platform_device *pdev) serial8250_unregister_port(data->line); - if (!IS_ERR(data->rst)) - reset_control_assert(data->rst); + reset_control_assert(data->rst); if (!IS_ERR(data->pclk)) clk_disable_unprepare(data->pclk); diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 85a12f032402..82fc48eca1df 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -39,6 +39,7 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offset) { + int reg_offset = offset; offset <<= port->regshift; switch (port->iotype) { @@ -52,6 +53,8 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse return ioread32be(port->membase + offset); case UPIO_PORT: return inb(port->iobase + offset); + case UPIO_AU: + return port->serial_in(port, reg_offset); default: return 0; } @@ -59,6 +62,7 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse static void __init serial8250_early_out(struct uart_port *port, int offset, int value) { + int reg_offset = offset; offset <<= port->regshift; switch (port->iotype) { @@ -77,6 +81,9 @@ static void __init serial8250_early_out(struct uart_port *port, int offset, int case UPIO_PORT: outb(value, port->iobase + offset); break; + case UPIO_AU: + port->serial_out(port, reg_offset, value); + break; } } @@ -172,3 +179,20 @@ OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup); OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup); #endif + +#ifdef CONFIG_SERIAL_8250_RT288X + +unsigned int au_serial_in(struct uart_port *p, int offset); +void au_serial_out(struct uart_port *p, int offset, int value); + +static int __init early_au_setup(struct earlycon_device *dev, const char *opt) +{ + dev->port.serial_in = au_serial_in; + dev->port.serial_out = au_serial_out; + dev->port.iotype = UPIO_AU; + dev->con->write = early_serial8250_write; + return 0; +} +OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup); + +#endif diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index b89c4ffc0486..1270ff163f63 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -483,5 +483,5 @@ static struct pci_driver exar_pci_driver = { module_pci_driver(exar_pci_driver); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Exar Serial Dricer"); +MODULE_DESCRIPTION("Exar Serial Driver"); MODULE_AUTHOR("Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>"); diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c index b67e7a544935..e500f7dd2470 100644 --- a/drivers/tty/serial/8250/8250_fintek.c +++ b/drivers/tty/serial/8250/8250_fintek.c @@ -61,6 +61,12 @@ * The IRQ setting mode of F81866 is not the same with F81216 series. * Level/Low: IRQ_MODE0:0, IRQ_MODE1:0 * Edge/High: IRQ_MODE0:1, IRQ_MODE1:0 + * + * Clock speeds for UART (register F2h) + * 00: 1.8432MHz. + * 01: 18.432MHz. + * 10: 24MHz. + * 11: 14.769MHz. */ #define F81866_IRQ_MODE 0xf0 #define F81866_IRQ_SHARE BIT(0) @@ -72,6 +78,13 @@ #define F81866_LDN_LOW 0x10 #define F81866_LDN_HIGH 0x16 +#define F81866_UART_CLK 0xF2 +#define F81866_UART_CLK_MASK (BIT(1) | BIT(0)) +#define F81866_UART_CLK_1_8432MHZ 0 +#define F81866_UART_CLK_14_769MHZ (BIT(1) | BIT(0)) +#define F81866_UART_CLK_18_432MHZ BIT(0) +#define F81866_UART_CLK_24MHZ BIT(1) + struct fintek_8250 { u16 pid; u16 base_port; @@ -256,8 +269,26 @@ static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata) } } -static int probe_setup_port(struct fintek_8250 *pdata, u16 io_address, - unsigned int irq) +static void fintek_8250_goto_highspeed(struct uart_8250_port *uart, + struct fintek_8250 *pdata) +{ + sio_write_reg(pdata, LDN, pdata->index); + + switch (pdata->pid) { + case CHIP_ID_F81866: /* set uart clock for high speed serial mode */ + sio_write_mask_reg(pdata, F81866_UART_CLK, + F81866_UART_CLK_MASK, + F81866_UART_CLK_14_769MHZ); + + uart->port.uartclk = 921600 * 16; + break; + default: /* leave clock speed untouched */ + break; + } +} + +static int probe_setup_port(struct fintek_8250 *pdata, + struct uart_8250_port *uart) { static const u16 addr[] = {0x4e, 0x2e}; static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67}; @@ -284,18 +315,20 @@ static int probe_setup_port(struct fintek_8250 *pdata, u16 io_address, sio_write_reg(pdata, LDN, k); aux = sio_read_reg(pdata, IO_ADDR1); aux |= sio_read_reg(pdata, IO_ADDR2) << 8; - if (aux != io_address) + if (aux != uart->port.iobase) continue; pdata->index = k; - irq_data = irq_get_irq_data(irq); + irq_data = irq_get_irq_data(uart->port.irq); if (irq_data) level_mode = irqd_is_level_type(irq_data); fintek_8250_set_irq_mode(pdata, level_mode); fintek_8250_set_max_fifo(pdata); + fintek_8250_goto_highspeed(uart, pdata); + fintek_8250_exit_key(addr[i]); return 0; @@ -330,7 +363,7 @@ int fintek_8250_probe(struct uart_8250_port *uart) struct fintek_8250 *pdata; struct fintek_8250 probe_data; - if (probe_setup_port(&probe_data, uart->port.iobase, uart->port.irq)) + if (probe_setup_port(&probe_data, uart)) return -ENODEV; pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL); diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c index f3ea90f0e411..7dddd7e6a01c 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -183,7 +183,6 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) if (ret) return; - pci_set_master(pdev); pci_try_set_mwi(pdev); /* Special DMA address for UART */ @@ -216,6 +215,8 @@ static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port) struct pci_dev *pdev = to_pci_dev(port->dev); int ret; + pci_set_master(pdev); + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); if (ret < 0) return ret; diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 6119516ef5fc..09a65a3ec7f7 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -328,7 +328,7 @@ static const s8 au_io_out_map[8] = { -1, /* UART_SCR (unmapped) */ }; -static unsigned int au_serial_in(struct uart_port *p, int offset) +unsigned int au_serial_in(struct uart_port *p, int offset) { if (offset >= ARRAY_SIZE(au_io_in_map)) return UINT_MAX; @@ -338,7 +338,7 @@ static unsigned int au_serial_in(struct uart_port *p, int offset) return __raw_readl(p->membase + (offset << p->regshift)); } -static void au_serial_out(struct uart_port *p, int offset, int value) +void au_serial_out(struct uart_port *p, int offset, int value) { if (offset >= ARRAY_SIZE(au_io_out_map)) return; diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 6117ac8da48f..5c8850f7a2a0 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -630,6 +630,15 @@ config SERIAL_UARTLITE_CONSOLE console (the system console is the device which receives all kernel messages and warnings and which allows logins in single user mode). +config SERIAL_UARTLITE_NR_UARTS + int "Maximum number of uartlite serial ports" + depends on SERIAL_UARTLITE + range 1 256 + default 1 + help + Set this to the number of uartlites in your system, or the number + you think you might implement. + config SERIAL_SUNCORE bool depends on SPARC @@ -1343,6 +1352,7 @@ config SERIAL_ALTERA_JTAGUART_CONSOLE bool "Altera JTAG UART console support" depends on SERIAL_ALTERA_JTAGUART=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help Enable a Altera JTAG UART port to be the system console. @@ -1382,6 +1392,7 @@ config SERIAL_ALTERA_UART_CONSOLE bool "Altera UART console support" depends on SERIAL_ALTERA_UART=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help Enable a Altera UART port to be the system console. diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 2d6288bc4554..53c03e005132 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -3,7 +3,6 @@ # obj-$(CONFIG_SERIAL_CORE) += serial_core.o -obj-$(CONFIG_SERIAL_21285) += 21285.o obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o @@ -17,6 +16,8 @@ obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o +obj-$(CONFIG_SERIAL_21285) += 21285.o + # Now bring in any enabled 8250/16450/16550 type drivers. obj-$(CONFIG_SERIAL_8250) += 8250/ diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c index e409d7dac7ab..18e3f8342b85 100644 --- a/drivers/tty/serial/altera_jtaguart.c +++ b/drivers/tty/serial/altera_jtaguart.c @@ -383,6 +383,26 @@ console_initcall(altera_jtaguart_console_init); #define ALTERA_JTAGUART_CONSOLE (&altera_jtaguart_console) +static void altera_jtaguart_earlycon_write(struct console *co, const char *s, + unsigned int count) +{ + struct earlycon_device *dev = co->data; + + uart_console_write(&dev->port, s, count, altera_jtaguart_console_putc); +} + +static int __init altera_jtaguart_earlycon_setup(struct earlycon_device *dev, + const char *options) +{ + if (!dev->port.membase) + return -ENODEV; + + dev->con->write = altera_jtaguart_earlycon_write; + return 0; +} + +OF_EARLYCON_DECLARE(juart, "altr,juart-1.0", altera_jtaguart_earlycon_setup); + #else #define ALTERA_JTAGUART_CONSOLE NULL diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index 820a74208696..46d3438a0d27 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -489,6 +489,38 @@ console_initcall(altera_uart_console_init); #define ALTERA_UART_CONSOLE (&altera_uart_console) +static void altera_uart_earlycon_write(struct console *co, const char *s, + unsigned int count) +{ + struct earlycon_device *dev = co->data; + + uart_console_write(&dev->port, s, count, altera_uart_console_putc); +} + +static int __init altera_uart_earlycon_setup(struct earlycon_device *dev, + const char *options) +{ + struct uart_port *port = &dev->port; + + if (!port->membase) + return -ENODEV; + + /* Enable RX interrupts now */ + writel(ALTERA_UART_CONTROL_RRDY_MSK, + port->membase + ALTERA_UART_CONTROL_REG); + + if (dev->baud) { + unsigned int baudclk = port->uartclk / dev->baud; + + writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG); + } + + dev->con->write = altera_uart_earlycon_write; + return 0; +} + +OF_EARLYCON_DECLARE(uart, "altr,uart-1.0", altera_uart_earlycon_setup); + #else #define ALTERA_UART_CONSOLE NULL diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index b0a377725d63..8a857bb34fbb 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1327,14 +1327,15 @@ static void pl011_stop_tx(struct uart_port *port) pl011_dma_tx_stop(uap); } -static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq); +static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq); /* Start TX with programmed I/O only (no DMA) */ static void pl011_start_tx_pio(struct uart_amba_port *uap) { - uap->im |= UART011_TXIM; - pl011_write(uap->im, uap, REG_IMSC); - pl011_tx_chars(uap, false); + if (pl011_tx_chars(uap, false)) { + uap->im |= UART011_TXIM; + pl011_write(uap->im, uap, REG_IMSC); + } } static void pl011_start_tx(struct uart_port *port) @@ -1414,25 +1415,26 @@ static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c, return true; } -static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) +/* Returns true if tx interrupts have to be (kept) enabled */ +static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) { struct circ_buf *xmit = &uap->port.state->xmit; int count = uap->fifosize >> 1; if (uap->port.x_char) { if (!pl011_tx_char(uap, uap->port.x_char, from_irq)) - return; + return true; uap->port.x_char = 0; --count; } if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { pl011_stop_tx(&uap->port); - return; + return false; } /* If we are using DMA mode, try to send some characters. */ if (pl011_dma_tx_irq(uap)) - return; + return true; do { if (likely(from_irq) && count-- == 0) @@ -1447,8 +1449,11 @@ static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq) if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit)) { pl011_stop_tx(&uap->port); + return false; + } + return true; } static void pl011_modem_status(struct uart_amba_port *uap) @@ -2470,19 +2475,34 @@ static int __init pl011_early_console_setup(struct earlycon_device *device, if (!device->port.membase) return -ENODEV; - /* On QDF2400 SOCs affected by Erratum 44, the "qdf2400_e44" must - * also be specified, e.g. "earlycon=pl011,<address>,qdf2400_e44". - */ - if (!strcmp(device->options, "qdf2400_e44")) - device->con->write = qdf2400_e44_early_write; - else - device->con->write = pl011_early_write; + device->con->write = pl011_early_write; return 0; } OF_EARLYCON_DECLARE(pl011, "arm,pl011", pl011_early_console_setup); OF_EARLYCON_DECLARE(pl011, "arm,sbsa-uart", pl011_early_console_setup); -EARLYCON_DECLARE(qdf2400_e44, pl011_early_console_setup); + +/* + * On Qualcomm Datacenter Technologies QDF2400 SOCs affected by + * Erratum 44, traditional earlycon can be enabled by specifying + * "earlycon=qdf2400_e44,<address>". Any options are ignored. + * + * Alternatively, you can just specify "earlycon", and the early console + * will be enabled with the information from the SPCR table. In this + * case, the SPCR code will detect the need for the E44 work-around, + * and set the console name to "qdf2400_e44". + */ +static int __init +qdf2400_e44_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = qdf2400_e44_early_write; + return 0; +} +EARLYCON_DECLARE(qdf2400_e44, qdf2400_e44_early_console_setup); #else #define AMBA_CONSOLE NULL diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 1f50a83ef958..c355ac9abafc 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -38,7 +38,6 @@ #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/atmel_pdc.h> -#include <linux/atmel_serial.h> #include <linux/uaccess.h> #include <linux/platform_data/atmel.h> #include <linux/timer.h> @@ -71,6 +70,7 @@ #include <linux/serial_core.h> #include "serial_mctrl_gpio.h" +#include "atmel_serial.h" static void atmel_start_rx(struct uart_port *port); static void atmel_stop_rx(struct uart_port *port); @@ -119,8 +119,9 @@ struct atmel_uart_char { /* * at91: 6 USARTs and one DBGU port (SAM9260) * avr32: 4 + * samx7: 3 USARTs and 5 UARTs */ -#define ATMEL_MAX_UART 7 +#define ATMEL_MAX_UART 8 /* * We wrap our port structure around the generic uart_port. @@ -175,6 +176,7 @@ struct atmel_uart_port { unsigned int pending_status; spinlock_t lock_suspended; +#ifdef CONFIG_PM struct { u32 cr; u32 mr; @@ -185,6 +187,7 @@ struct atmel_uart_port { u32 fmr; u32 fimr; } cache; +#endif int (*prepare_rx)(struct uart_port *port); int (*prepare_tx)(struct uart_port *port); diff --git a/drivers/tty/serial/atmel_serial.h b/drivers/tty/serial/atmel_serial.h new file mode 100644 index 000000000000..bd2560502f3c --- /dev/null +++ b/drivers/tty/serial/atmel_serial.h @@ -0,0 +1,169 @@ +/* + * include/linux/atmel_serial.h + * + * Copyright (C) 2005 Ivan Kokshaysky + * Copyright (C) SAN People + * + * USART registers. + * Based on AT91RM9200 datasheet revision E. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef ATMEL_SERIAL_H +#define ATMEL_SERIAL_H + +#define ATMEL_US_CR 0x00 /* Control Register */ +#define ATMEL_US_RSTRX BIT(2) /* Reset Receiver */ +#define ATMEL_US_RSTTX BIT(3) /* Reset Transmitter */ +#define ATMEL_US_RXEN BIT(4) /* Receiver Enable */ +#define ATMEL_US_RXDIS BIT(5) /* Receiver Disable */ +#define ATMEL_US_TXEN BIT(6) /* Transmitter Enable */ +#define ATMEL_US_TXDIS BIT(7) /* Transmitter Disable */ +#define ATMEL_US_RSTSTA BIT(8) /* Reset Status Bits */ +#define ATMEL_US_STTBRK BIT(9) /* Start Break */ +#define ATMEL_US_STPBRK BIT(10) /* Stop Break */ +#define ATMEL_US_STTTO BIT(11) /* Start Time-out */ +#define ATMEL_US_SENDA BIT(12) /* Send Address */ +#define ATMEL_US_RSTIT BIT(13) /* Reset Iterations */ +#define ATMEL_US_RSTNACK BIT(14) /* Reset Non Acknowledge */ +#define ATMEL_US_RETTO BIT(15) /* Rearm Time-out */ +#define ATMEL_US_DTREN BIT(16) /* Data Terminal Ready Enable */ +#define ATMEL_US_DTRDIS BIT(17) /* Data Terminal Ready Disable */ +#define ATMEL_US_RTSEN BIT(18) /* Request To Send Enable */ +#define ATMEL_US_RTSDIS BIT(19) /* Request To Send Disable */ +#define ATMEL_US_TXFCLR BIT(24) /* Transmit FIFO Clear */ +#define ATMEL_US_RXFCLR BIT(25) /* Receive FIFO Clear */ +#define ATMEL_US_TXFLCLR BIT(26) /* Transmit FIFO Lock Clear */ +#define ATMEL_US_FIFOEN BIT(30) /* FIFO enable */ +#define ATMEL_US_FIFODIS BIT(31) /* FIFO disable */ + +#define ATMEL_US_MR 0x04 /* Mode Register */ +#define ATMEL_US_USMODE GENMASK(3, 0) /* Mode of the USART */ +#define ATMEL_US_USMODE_NORMAL 0 +#define ATMEL_US_USMODE_RS485 1 +#define ATMEL_US_USMODE_HWHS 2 +#define ATMEL_US_USMODE_MODEM 3 +#define ATMEL_US_USMODE_ISO7816_T0 4 +#define ATMEL_US_USMODE_ISO7816_T1 6 +#define ATMEL_US_USMODE_IRDA 8 +#define ATMEL_US_USCLKS GENMASK(5, 4) /* Clock Selection */ +#define ATMEL_US_USCLKS_MCK (0 << 4) +#define ATMEL_US_USCLKS_MCK_DIV8 (1 << 4) +#define ATMEL_US_USCLKS_SCK (3 << 4) +#define ATMEL_US_CHRL GENMASK(7, 6) /* Character Length */ +#define ATMEL_US_CHRL_5 (0 << 6) +#define ATMEL_US_CHRL_6 (1 << 6) +#define ATMEL_US_CHRL_7 (2 << 6) +#define ATMEL_US_CHRL_8 (3 << 6) +#define ATMEL_US_SYNC BIT(8) /* Synchronous Mode Select */ +#define ATMEL_US_PAR GENMASK(11, 9) /* Parity Type */ +#define ATMEL_US_PAR_EVEN (0 << 9) +#define ATMEL_US_PAR_ODD (1 << 9) +#define ATMEL_US_PAR_SPACE (2 << 9) +#define ATMEL_US_PAR_MARK (3 << 9) +#define ATMEL_US_PAR_NONE (4 << 9) +#define ATMEL_US_PAR_MULTI_DROP (6 << 9) +#define ATMEL_US_NBSTOP GENMASK(13, 12) /* Number of Stop Bits */ +#define ATMEL_US_NBSTOP_1 (0 << 12) +#define ATMEL_US_NBSTOP_1_5 (1 << 12) +#define ATMEL_US_NBSTOP_2 (2 << 12) +#define ATMEL_US_CHMODE GENMASK(15, 14) /* Channel Mode */ +#define ATMEL_US_CHMODE_NORMAL (0 << 14) +#define ATMEL_US_CHMODE_ECHO (1 << 14) +#define ATMEL_US_CHMODE_LOC_LOOP (2 << 14) +#define ATMEL_US_CHMODE_REM_LOOP (3 << 14) +#define ATMEL_US_MSBF BIT(16) /* Bit Order */ +#define ATMEL_US_MODE9 BIT(17) /* 9-bit Character Length */ +#define ATMEL_US_CLKO BIT(18) /* Clock Output Select */ +#define ATMEL_US_OVER BIT(19) /* Oversampling Mode */ +#define ATMEL_US_INACK BIT(20) /* Inhibit Non Acknowledge */ +#define ATMEL_US_DSNACK BIT(21) /* Disable Successive NACK */ +#define ATMEL_US_MAX_ITER GENMASK(26, 24) /* Max Iterations */ +#define ATMEL_US_FILTER BIT(28) /* Infrared Receive Line Filter */ + +#define ATMEL_US_IER 0x08 /* Interrupt Enable Register */ +#define ATMEL_US_RXRDY BIT(0) /* Receiver Ready */ +#define ATMEL_US_TXRDY BIT(1) /* Transmitter Ready */ +#define ATMEL_US_RXBRK BIT(2) /* Break Received / End of Break */ +#define ATMEL_US_ENDRX BIT(3) /* End of Receiver Transfer */ +#define ATMEL_US_ENDTX BIT(4) /* End of Transmitter Transfer */ +#define ATMEL_US_OVRE BIT(5) /* Overrun Error */ +#define ATMEL_US_FRAME BIT(6) /* Framing Error */ +#define ATMEL_US_PARE BIT(7) /* Parity Error */ +#define ATMEL_US_TIMEOUT BIT(8) /* Receiver Time-out */ +#define ATMEL_US_TXEMPTY BIT(9) /* Transmitter Empty */ +#define ATMEL_US_ITERATION BIT(10) /* Max number of Repetitions Reached */ +#define ATMEL_US_TXBUFE BIT(11) /* Transmission Buffer Empty */ +#define ATMEL_US_RXBUFF BIT(12) /* Reception Buffer Full */ +#define ATMEL_US_NACK BIT(13) /* Non Acknowledge */ +#define ATMEL_US_RIIC BIT(16) /* Ring Indicator Input Change */ +#define ATMEL_US_DSRIC BIT(17) /* Data Set Ready Input Change */ +#define ATMEL_US_DCDIC BIT(18) /* Data Carrier Detect Input Change */ +#define ATMEL_US_CTSIC BIT(19) /* Clear to Send Input Change */ +#define ATMEL_US_RI BIT(20) /* RI */ +#define ATMEL_US_DSR BIT(21) /* DSR */ +#define ATMEL_US_DCD BIT(22) /* DCD */ +#define ATMEL_US_CTS BIT(23) /* CTS */ + +#define ATMEL_US_IDR 0x0c /* Interrupt Disable Register */ +#define ATMEL_US_IMR 0x10 /* Interrupt Mask Register */ +#define ATMEL_US_CSR 0x14 /* Channel Status Register */ +#define ATMEL_US_RHR 0x18 /* Receiver Holding Register */ +#define ATMEL_US_THR 0x1c /* Transmitter Holding Register */ +#define ATMEL_US_SYNH BIT(15) /* Transmit/Receive Sync */ + +#define ATMEL_US_BRGR 0x20 /* Baud Rate Generator Register */ +#define ATMEL_US_CD GENMASK(15, 0) /* Clock Divider */ +#define ATMEL_US_FP_OFFSET 16 /* Fractional Part */ +#define ATMEL_US_FP_MASK 0x7 + +#define ATMEL_US_RTOR 0x24 /* Receiver Time-out Register for USART */ +#define ATMEL_UA_RTOR 0x28 /* Receiver Time-out Register for UART */ +#define ATMEL_US_TO GENMASK(15, 0) /* Time-out Value */ + +#define ATMEL_US_TTGR 0x28 /* Transmitter Timeguard Register */ +#define ATMEL_US_TG GENMASK(7, 0) /* Timeguard Value */ + +#define ATMEL_US_FIDI 0x40 /* FI DI Ratio Register */ +#define ATMEL_US_NER 0x44 /* Number of Errors Register */ +#define ATMEL_US_IF 0x4c /* IrDA Filter Register */ + +#define ATMEL_US_CMPR 0x90 /* Comparaison Register */ +#define ATMEL_US_FMR 0xa0 /* FIFO Mode Register */ +#define ATMEL_US_TXRDYM(data) (((data) & 0x3) << 0) /* TX Ready Mode */ +#define ATMEL_US_RXRDYM(data) (((data) & 0x3) << 4) /* RX Ready Mode */ +#define ATMEL_US_ONE_DATA 0x0 +#define ATMEL_US_TWO_DATA 0x1 +#define ATMEL_US_FOUR_DATA 0x2 +#define ATMEL_US_FRTSC BIT(7) /* FIFO RTS pin Control */ +#define ATMEL_US_TXFTHRES(thr) (((thr) & 0x3f) << 8) /* TX FIFO Threshold */ +#define ATMEL_US_RXFTHRES(thr) (((thr) & 0x3f) << 16) /* RX FIFO Threshold */ +#define ATMEL_US_RXFTHRES2(thr) (((thr) & 0x3f) << 24) /* RX FIFO Threshold2 */ + +#define ATMEL_US_FLR 0xa4 /* FIFO Level Register */ +#define ATMEL_US_TXFL(reg) (((reg) >> 0) & 0x3f) /* TX FIFO Level */ +#define ATMEL_US_RXFL(reg) (((reg) >> 16) & 0x3f) /* RX FIFO Level */ + +#define ATMEL_US_FIER 0xa8 /* FIFO Interrupt Enable Register */ +#define ATMEL_US_FIDR 0xac /* FIFO Interrupt Disable Register */ +#define ATMEL_US_FIMR 0xb0 /* FIFO Interrupt Mask Register */ +#define ATMEL_US_FESR 0xb4 /* FIFO Event Status Register */ +#define ATMEL_US_TXFEF BIT(0) /* Transmit FIFO Empty Flag */ +#define ATMEL_US_TXFFF BIT(1) /* Transmit FIFO Full Flag */ +#define ATMEL_US_TXFTHF BIT(2) /* Transmit FIFO Threshold Flag */ +#define ATMEL_US_RXFEF BIT(3) /* Receive FIFO Empty Flag */ +#define ATMEL_US_RXFFF BIT(4) /* Receive FIFO Full Flag */ +#define ATMEL_US_RXFTHF BIT(5) /* Receive FIFO Threshold Flag */ +#define ATMEL_US_TXFPTEF BIT(6) /* Transmit FIFO Pointer Error Flag */ +#define ATMEL_US_RXFPTEF BIT(7) /* Receive FIFO Pointer Error Flag */ +#define ATMEL_US_TXFLOCK BIT(8) /* Transmit FIFO Lock (FESR only) */ +#define ATMEL_US_RXFTHF2 BIT(9) /* Receive FIFO Threshold Flag 2 */ + +#define ATMEL_US_NAME 0xf0 /* Ip Name */ +#define ATMEL_US_VERSION 0xfc /* Ip Version */ + +#endif diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index f02934ffb329..15df1ba78095 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1705,6 +1705,13 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count) { struct lpuart_port *sport = lpuart_ports[co->index]; unsigned char old_cr2, cr2; + unsigned long flags; + int locked = 1; + + if (sport->port.sysrq || oops_in_progress) + locked = spin_trylock_irqsave(&sport->port.lock, flags); + else + spin_lock_irqsave(&sport->port.lock, flags); /* first save CR2 and then disable interrupts */ cr2 = old_cr2 = readb(sport->port.membase + UARTCR2); @@ -1719,6 +1726,9 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count) barrier(); writeb(old_cr2, sport->port.membase + UARTCR2); + + if (locked) + spin_unlock_irqrestore(&sport->port.lock, flags); } static void @@ -1726,6 +1736,13 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count) { struct lpuart_port *sport = lpuart_ports[co->index]; unsigned long old_cr, cr; + unsigned long flags; + int locked = 1; + + if (sport->port.sysrq || oops_in_progress) + locked = spin_trylock_irqsave(&sport->port.lock, flags); + else + spin_lock_irqsave(&sport->port.lock, flags); /* first save CR2 and then disable interrupts */ cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL); @@ -1740,6 +1757,9 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count) barrier(); lpuart32_write(old_cr, sport->port.membase + UARTCTRL); + + if (locked) + spin_unlock_irqrestore(&sport->port.lock, flags); } /* diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index e3e152cbc75e..33509b4beaec 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -719,6 +719,27 @@ out: return IRQ_HANDLED; } +static void imx_disable_rx_int(struct imx_port *sport) +{ + unsigned long temp; + + sport->dma_is_rxing = 1; + + /* disable the receiver ready and aging timer interrupts */ + temp = readl(sport->port.membase + UCR1); + temp &= ~(UCR1_RRDYEN); + writel(temp, sport->port.membase + UCR1); + + temp = readl(sport->port.membase + UCR2); + temp &= ~(UCR2_ATEN); + writel(temp, sport->port.membase + UCR2); + + /* disable the rx errors interrupts */ + temp = readl(sport->port.membase + UCR4); + temp &= ~UCR4_OREN; + writel(temp, sport->port.membase + UCR4); +} + static void clear_rx_errors(struct imx_port *sport); static int start_rx_dma(struct imx_port *sport); /* @@ -734,21 +755,8 @@ static void imx_dma_rxint(struct imx_port *sport) temp = readl(sport->port.membase + USR2); if ((temp & USR2_RDR) && !sport->dma_is_rxing) { - sport->dma_is_rxing = 1; - /* disable the receiver ready and aging timer interrupts */ - temp = readl(sport->port.membase + UCR1); - temp &= ~(UCR1_RRDYEN); - writel(temp, sport->port.membase + UCR1); - - temp = readl(sport->port.membase + UCR2); - temp &= ~(UCR2_ATEN); - writel(temp, sport->port.membase + UCR2); - - /* disable the rx errors interrupts */ - temp = readl(sport->port.membase + UCR4); - temp &= ~UCR4_OREN; - writel(temp, sport->port.membase + UCR4); + imx_disable_rx_int(sport); /* tell the DMA to receive the data. */ start_rx_dma(sport); @@ -1317,19 +1325,10 @@ static int imx_startup(struct uart_port *port) if (!is_imx1_uart(sport)) { temp = readl(sport->port.membase + UCR3); - /* - * The effect of RI and DCD differs depending on the UFCR_DCEDTE - * bit. In DCE mode they control the outputs, in DTE mode they - * enable the respective irqs. At least the DCD irq cannot be - * cleared on i.MX25 at least, so it's not usable and must be - * disabled. I don't have test hardware to check if RI has the - * same problem but I consider this likely so it's disabled for - * now, too. - */ - temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP | - UCR3_DTRDEN | UCR3_RI | UCR3_DCD; + temp |= UCR3_DTRDEN | UCR3_RI | UCR3_DCD; if (sport->dte_mode) + /* disable broken interrupts */ temp &= ~(UCR3_RI | UCR3_DCD); writel(temp, sport->port.membase + UCR3); @@ -1339,6 +1338,33 @@ static int imx_startup(struct uart_port *port) * Enable modem status interrupts */ imx_enable_ms(&sport->port); + + /* + * If the serial port is opened for reading start RX DMA immediately + * instead of waiting for RX FIFO interrupts. In our iMX53 the average + * delay for the first reception dropped from approximately 35000 + * microseconds to 1000 microseconds. + */ + if (sport->dma_is_enabled) { + struct tty_struct *tty = sport->port.state->port.tty; + struct tty_file_private *file_priv; + int readcnt = 0; + + spin_lock(&tty->files_lock); + + if (!list_empty(&tty->tty_files)) + list_for_each_entry(file_priv, &tty->tty_files, list) + if (!(file_priv->file->f_flags & O_WRONLY)) + readcnt++; + + spin_unlock(&tty->files_lock); + + if (readcnt > 0) { + imx_disable_rx_int(sport); + start_rx_dma(sport); + } + } + spin_unlock_irqrestore(&sport->port.lock, flags); return 0; @@ -1584,8 +1610,6 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, ufcr = readl(sport->port.membase + UFCR); ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); - if (sport->dte_mode) - ufcr |= UFCR_DCEDTE; writel(ufcr, sport->port.membase + UFCR); writel(num, sport->port.membase + UBIR); @@ -2153,6 +2177,27 @@ static int serial_imx_probe(struct platform_device *pdev) UCR1_TXMPTYEN | UCR1_RTSDEN); writel_relaxed(reg, sport->port.membase + UCR1); + if (!is_imx1_uart(sport) && sport->dte_mode) { + /* + * The DCEDTE bit changes the direction of DSR, DCD, DTR and RI + * and influences if UCR3_RI and UCR3_DCD changes the level of RI + * and DCD (when they are outputs) or enables the respective + * irqs. So set this bit early, i.e. before requesting irqs. + */ + writel(UFCR_DCEDTE, sport->port.membase + UFCR); + + /* + * Disable UCR3_RI and UCR3_DCD irqs. They are also not + * enabled later because they cannot be cleared + * (confirmed on i.MX25) which makes them unusable. + */ + writel(IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP | UCR3_DSR, + sport->port.membase + UCR3); + + } else { + writel(0, sport->port.membase + UFCR); + } + clk_disable_unprepare(sport->clk_ipg); /* diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index a4734649a0f0..1ea05ac57aa7 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1770,7 +1770,8 @@ static int serial_omap_probe(struct platform_device *pdev) return 0; err_add_port: - pm_runtime_put(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_qos_remove_request(&up->pm_qos_request); device_init_wakeup(up->dev, false); @@ -1783,9 +1784,13 @@ static int serial_omap_remove(struct platform_device *dev) { struct uart_omap_port *up = platform_get_drvdata(dev); + pm_runtime_get_sync(up->dev); + + uart_remove_one_port(&serial_omap_reg, &up->port); + + pm_runtime_dont_use_autosuspend(up->dev); pm_runtime_put_sync(up->dev); pm_runtime_disable(up->dev); - uart_remove_one_port(&serial_omap_reg, &up->port); pm_qos_remove_request(&up->pm_qos_request); device_init_wakeup(&dev->dev, false); diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 7a17aedbf902..8aca18c4cdea 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -859,7 +859,7 @@ static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) { struct s3c24xx_uart_dma *dma = p->dma; - unsigned long flags; + int ret; /* Default slave configuration parameters */ dma->rx_conf.direction = DMA_DEV_TO_MEM; @@ -884,8 +884,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) dma->tx_chan = dma_request_chan(p->port.dev, "tx"); if (IS_ERR(dma->tx_chan)) { - dma_release_channel(dma->rx_chan); - return PTR_ERR(dma->tx_chan); + ret = PTR_ERR(dma->tx_chan); + goto err_release_rx; } dmaengine_slave_config(dma->tx_chan, &dma->tx_conf); @@ -894,26 +894,38 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) dma->rx_size = PAGE_SIZE; dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL); - if (!dma->rx_buf) { - dma_release_channel(dma->rx_chan); - dma_release_channel(dma->tx_chan); - return -ENOMEM; + ret = -ENOMEM; + goto err_release_tx; } - dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf, + dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf, dma->rx_size, DMA_FROM_DEVICE); - - spin_lock_irqsave(&p->port.lock, flags); + if (dma_mapping_error(p->port.dev, dma->rx_addr)) { + ret = -EIO; + goto err_free_rx; + } /* TX buffer */ - dma->tx_addr = dma_map_single(dma->tx_chan->device->dev, - p->port.state->xmit.buf, + dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, UART_XMIT_SIZE, DMA_TO_DEVICE); - - spin_unlock_irqrestore(&p->port.lock, flags); + if (dma_mapping_error(p->port.dev, dma->tx_addr)) { + ret = -EIO; + goto err_unmap_rx; + } return 0; + +err_unmap_rx: + dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, + DMA_FROM_DEVICE); +err_free_rx: + kfree(dma->rx_buf); +err_release_tx: + dma_release_channel(dma->tx_chan); +err_release_rx: + dma_release_channel(dma->rx_chan); + return ret; } static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p) @@ -922,7 +934,7 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p) if (dma->rx_chan) { dmaengine_terminate_all(dma->rx_chan); - dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr, + dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, DMA_FROM_DEVICE); kfree(dma->rx_buf); dma_release_channel(dma->rx_chan); @@ -931,7 +943,7 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p) if (dma->tx_chan) { dmaengine_terminate_all(dma->tx_chan); - dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr, + dma_unmap_single(p->port.dev, dma->tx_addr, UART_XMIT_SIZE, DMA_TO_DEVICE); dma_release_channel(dma->tx_chan); dma->tx_chan = NULL; diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c index 771f361c47ea..041625cc24bb 100644 --- a/drivers/tty/serial/sb1250-duart.c +++ b/drivers/tty/serial/sb1250-duart.c @@ -41,7 +41,7 @@ #include <linux/tty_flip.h> #include <linux/types.h> -#include <linux/atomic.h> +#include <linux/refcount.h> #include <asm/io.h> #include <asm/war.h> @@ -103,7 +103,7 @@ struct sbd_port { struct sbd_duart { struct sbd_port sport[2]; unsigned long mapctrl; - atomic_t map_guard; + refcount_t map_guard; }; #define to_sport(uport) container_of(uport, struct sbd_port, port) @@ -654,15 +654,13 @@ static void sbd_release_port(struct uart_port *uport) { struct sbd_port *sport = to_sport(uport); struct sbd_duart *duart = sport->duart; - int map_guard; iounmap(sport->memctrl); sport->memctrl = NULL; iounmap(uport->membase); uport->membase = NULL; - map_guard = atomic_add_return(-1, &duart->map_guard); - if (!map_guard) + if(refcount_dec_and_test(&duart->map_guard)) release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING); release_mem_region(uport->mapbase, DUART_CHANREG_SPACING); } @@ -698,7 +696,6 @@ static int sbd_request_port(struct uart_port *uport) { const char *err = KERN_ERR "sbd: Unable to reserve MMIO resource\n"; struct sbd_duart *duart = to_sport(uport)->duart; - int map_guard; int ret = 0; if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING, @@ -706,11 +703,11 @@ static int sbd_request_port(struct uart_port *uport) printk(err); return -EBUSY; } - map_guard = atomic_add_return(1, &duart->map_guard); - if (map_guard == 1) { + refcount_inc(&duart->map_guard); + if (refcount_read(&duart->map_guard) == 1) { if (!request_mem_region(duart->mapctrl, DUART_CHANREG_SPACING, "sb1250-duart")) { - atomic_add(-1, &duart->map_guard); + refcount_dec(&duart->map_guard); printk(err); ret = -EBUSY; } @@ -718,8 +715,7 @@ static int sbd_request_port(struct uart_port *uport) if (!ret) { ret = sbd_map_port(uport); if (ret) { - map_guard = atomic_add_return(-1, &duart->map_guard); - if (!map_guard) + if (refcount_dec_and_test(&duart->map_guard)) release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING); } diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 3fe56894974a..0f45b7884a2c 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2117,9 +2117,8 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) for (tries = 3; !ops->tx_empty(uport) && tries; tries--) msleep(10); if (!tries) - dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", - drv->dev_name, - drv->tty_driver->name_base + uport->line); + dev_err(uport->dev, "%s: Unable to drain transmitter\n", + uport->name); ops->shutdown(uport); } @@ -2248,11 +2247,10 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port) break; } - printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", + pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", port->dev ? dev_name(port->dev) : "", port->dev ? ": " : "", - drv->dev_name, - drv->tty_driver->name_base + port->line, + port->name, address, port->irq, port->uartclk / 16, uart_type(port)); } @@ -2331,9 +2329,6 @@ static int uart_poll_init(struct tty_driver *driver, int line, char *options) int flow = 'n'; int ret = 0; - if (!state) - return -1; - tport = &state->port; mutex_lock(&tport->mutex); @@ -2368,13 +2363,12 @@ static int uart_poll_get_char(struct tty_driver *driver, int line) struct uart_port *port; int ret = -1; - if (state) { - port = uart_port_ref(state); - if (port) { - ret = port->ops->poll_get_char(port); - uart_port_deref(port); - } + port = uart_port_ref(state); + if (port) { + ret = port->ops->poll_get_char(port); + uart_port_deref(port); } + return ret; } @@ -2384,9 +2378,6 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) struct uart_state *state = drv->state + line; struct uart_port *port; - if (!state) - return; - port = uart_port_ref(state); if (!port) return; @@ -2751,6 +2742,12 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) state->pm_state = UART_PM_STATE_UNDEFINED; uport->cons = drv->cons; uport->minor = drv->tty_driver->minor_start + uport->line; + uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, + drv->tty_driver->name_base + uport->line); + if (!uport->name) { + ret = -ENOMEM; + goto out; + } /* * If this port is a console, then the spinlock is already @@ -2868,6 +2865,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) if (uport->type != PORT_UNKNOWN && uport->ops->release_port) uport->ops->release_port(uport); kfree(uport->tty_groups); + kfree(uport->name); /* * Indicate that there isn't a port here anymore. diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 9a47cc4f16a2..71707e8e6e3f 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -683,24 +683,37 @@ static void sci_init_pins(struct uart_port *port, unsigned int cflag) } if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { + u16 data = serial_port_in(port, SCPDR); u16 ctrl = serial_port_in(port, SCPCR); /* Enable RXD and TXD pin functions */ ctrl &= ~(SCPCR_RXDC | SCPCR_TXDC); if (to_sci_port(port)->has_rtscts) { - /* RTS# is output, driven 1 */ - ctrl |= SCPCR_RTSC; - serial_port_out(port, SCPDR, - serial_port_in(port, SCPDR) | SCPDR_RTSD); + /* RTS# is output, active low, unless autorts */ + if (!(port->mctrl & TIOCM_RTS)) { + ctrl |= SCPCR_RTSC; + data |= SCPDR_RTSD; + } else if (!s->autorts) { + ctrl |= SCPCR_RTSC; + data &= ~SCPDR_RTSD; + } else { + /* Enable RTS# pin function */ + ctrl &= ~SCPCR_RTSC; + } /* Enable CTS# pin function */ ctrl &= ~SCPCR_CTSC; } + serial_port_out(port, SCPDR, data); serial_port_out(port, SCPCR, ctrl); } else if (sci_getreg(port, SCSPTR)->size) { u16 status = serial_port_in(port, SCSPTR); - /* RTS# is output, driven 1 */ - status |= SCSPTR_RTSIO | SCSPTR_RTSDT; + /* RTS# is always output; and active low, unless autorts */ + status |= SCSPTR_RTSIO; + if (!(port->mctrl & TIOCM_RTS)) + status |= SCSPTR_RTSDT; + else if (!s->autorts) + status &= ~SCSPTR_RTSDT; /* CTS# and SCK are inputs */ status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO); serial_port_out(port, SCSPTR, status); @@ -1985,11 +1998,13 @@ static int sci_startup(struct uart_port *port) dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); + sci_request_dma(port); + ret = sci_request_irq(s); - if (unlikely(ret < 0)) + if (unlikely(ret < 0)) { + sci_free_dma(port); return ret; - - sci_request_dma(port); + } return 0; } @@ -2021,8 +2036,8 @@ static void sci_shutdown(struct uart_port *port) } #endif - sci_free_dma(port); sci_free_irq(s); + sci_free_dma(port); } static int sci_sck_calc(struct sci_port *s, unsigned int bps, @@ -2157,10 +2172,6 @@ static void sci_reset(struct uart_port *port) unsigned int status; struct sci_port *s = to_sci_port(port); - do { - status = serial_port_in(port, SCxSR); - } while (!(status & SCxSR_TEND(port))); - serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ reg = sci_getreg(port, SCFCR); @@ -2374,6 +2385,10 @@ done: serial_port_out(port, SCFCR, ctrl); } + if (port->flags & UPF_HARD_FLOW) { + /* Refresh (Auto) RTS */ + sci_set_mctrl(port, port->mctrl); + } scr_val |= SCSCR_RE | SCSCR_TE | (s->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0)); diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index d98e3dc4838e..90996ad97b37 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -36,7 +36,7 @@ #define SPRD_FIFO_SIZE 128 #define SPRD_DEF_RATE 26000000 #define SPRD_BAUD_IO_LIMIT 3000000 -#define SPRD_TIMEOUT 256 +#define SPRD_TIMEOUT 256000 /* the offset of serial registers and BITs for them */ /* data registers */ diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index a93a3167a9c6..f5335be344f6 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -887,13 +887,12 @@ static void asc_console_write(struct console *co, const char *s, unsigned count) int locked = 1; u32 intenable; - local_irq_save(flags); if (port->sysrq) locked = 0; /* asc_interrupt has already claimed the lock */ else if (oops_in_progress) - locked = spin_trylock(&port->lock); + locked = spin_trylock_irqsave(&port->lock, flags); else - spin_lock(&port->lock); + spin_lock_irqsave(&port->lock, flags); /* * Disable interrupts so we don't get the IRQ line bouncing @@ -911,14 +910,13 @@ static void asc_console_write(struct console *co, const char *s, unsigned count) asc_out(port, ASC_INTEN, intenable); if (locked) - spin_unlock(&port->lock); - local_irq_restore(flags); + spin_unlock_irqrestore(&port->lock, flags); } static int asc_console_setup(struct console *co, char *options) { struct asc_port *ascport; - int baud = 9600; + int baud = 115200; int bits = 8; int parity = 'n'; int flow = 'n'; diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index 817bb0d3f326..c9b8d702dadc 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -28,7 +28,7 @@ #define ULITE_NAME "ttyUL" #define ULITE_MAJOR 204 #define ULITE_MINOR 187 -#define ULITE_NR_UARTS 16 +#define ULITE_NR_UARTS CONFIG_SERIAL_UARTLITE_NR_UARTS /* --------------------------------------------------------------------- * Register definitions diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index ad77d0ed0c46..c0539950f8d7 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -30,6 +30,7 @@ #include <linux/io.h> #include <linux/of.h> #include <linux/module.h> +#include <linux/pm_runtime.h> #define CDNS_UART_TTY_NAME "ttyPS" #define CDNS_UART_NAME "xuartps" @@ -176,6 +177,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); #define CDNS_UART_BDIV_MIN 4 #define CDNS_UART_BDIV_MAX 255 #define CDNS_UART_CD_MAX 65535 +#define UART_AUTOSUSPEND_TIMEOUT 3000 /** * struct cdns_uart - device data @@ -1065,16 +1067,13 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c) static void cdns_uart_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) { - struct cdns_uart *cdns_uart = port->private_data; - switch (state) { case UART_PM_STATE_OFF: - clk_disable(cdns_uart->uartclk); - clk_disable(cdns_uart->pclk); + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); break; default: - clk_enable(cdns_uart->pclk); - clk_enable(cdns_uart->uartclk); + pm_runtime_get_sync(port->dev); break; } } @@ -1353,12 +1352,7 @@ static int cdns_uart_suspend(struct device *device) * the suspend. */ uart_suspend_port(&cdns_uart_uart_driver, port); - if (console_suspend_enabled && !may_wake) { - struct cdns_uart *cdns_uart = port->private_data; - - clk_disable(cdns_uart->uartclk); - clk_disable(cdns_uart->pclk); - } else { + if (!(console_suspend_enabled && !may_wake)) { unsigned long flags = 0; spin_lock_irqsave(&port->lock, flags); @@ -1423,6 +1417,8 @@ static int cdns_uart_resume(struct device *device) ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN; writel(ctrl_reg, port->membase + CDNS_UART_CR); + clk_disable(cdns_uart->uartclk); + clk_disable(cdns_uart->pclk); spin_unlock_irqrestore(&port->lock, flags); } else { spin_lock_irqsave(&port->lock, flags); @@ -1436,9 +1432,33 @@ static int cdns_uart_resume(struct device *device) return uart_resume_port(&cdns_uart_uart_driver, port); } #endif /* ! CONFIG_PM_SLEEP */ +static int __maybe_unused cdns_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct uart_port *port = platform_get_drvdata(pdev); + struct cdns_uart *cdns_uart = port->private_data; + + clk_disable(cdns_uart->uartclk); + clk_disable(cdns_uart->pclk); + return 0; +}; + +static int __maybe_unused cdns_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct uart_port *port = platform_get_drvdata(pdev); + struct cdns_uart *cdns_uart = port->private_data; -static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend, - cdns_uart_resume); + clk_enable(cdns_uart->pclk); + clk_enable(cdns_uart->uartclk); + return 0; +}; + +static const struct dev_pm_ops cdns_uart_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(cdns_uart_suspend, cdns_uart_resume) + SET_RUNTIME_PM_OPS(cdns_runtime_suspend, + cdns_runtime_resume, NULL) +}; static const struct cdns_platform_data zynqmp_uart_def = { .quirks = CDNS_UART_RXBS_SUPPORT, }; @@ -1501,12 +1521,12 @@ static int cdns_uart_probe(struct platform_device *pdev) return PTR_ERR(cdns_uart_data->uartclk); } - rc = clk_prepare(cdns_uart_data->pclk); + rc = clk_prepare_enable(cdns_uart_data->pclk); if (rc) { dev_err(&pdev->dev, "Unable to enable pclk clock.\n"); return rc; } - rc = clk_prepare(cdns_uart_data->uartclk); + rc = clk_prepare_enable(cdns_uart_data->uartclk); if (rc) { dev_err(&pdev->dev, "Unable to enable device clock.\n"); goto err_out_clk_dis_pclk; @@ -1558,6 +1578,11 @@ static int cdns_uart_probe(struct platform_device *pdev) cdns_uart_data->port = port; platform_set_drvdata(pdev, port); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + rc = uart_add_one_port(&cdns_uart_uart_driver, port); if (rc) { dev_err(&pdev->dev, @@ -1573,9 +1598,12 @@ err_out_notif_unreg: &cdns_uart_data->clk_rate_change_nb); #endif err_out_clk_disable: - clk_unprepare(cdns_uart_data->uartclk); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + clk_disable_unprepare(cdns_uart_data->uartclk); err_out_clk_dis_pclk: - clk_unprepare(cdns_uart_data->pclk); + clk_disable_unprepare(cdns_uart_data->pclk); return rc; } @@ -1599,8 +1627,11 @@ static int cdns_uart_remove(struct platform_device *pdev) #endif rc = uart_remove_one_port(&cdns_uart_uart_driver, port); port->mapbase = 0; - clk_unprepare(cdns_uart_data->uartclk); - clk_unprepare(cdns_uart_data->pclk); + clk_disable_unprepare(cdns_uart_data->uartclk); + clk_disable_unprepare(cdns_uart_data->pclk); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); return rc; } diff --git a/drivers/tty/tty_baudrate.c b/drivers/tty/tty_baudrate.c new file mode 100644 index 000000000000..5c33fd25676d --- /dev/null +++ b/drivers/tty/tty_baudrate.c @@ -0,0 +1,232 @@ +/* + * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/termios.h> +#include <linux/tty.h> +#include <linux/export.h> + + +/* + * Routine which returns the baud rate of the tty + * + * Note that the baud_table needs to be kept in sync with the + * include/asm/termbits.h file. + */ +static const speed_t baud_table[] = { + 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, + 9600, 19200, 38400, 57600, 115200, 230400, 460800, +#ifdef __sparc__ + 76800, 153600, 307200, 614400, 921600 +#else + 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, + 2500000, 3000000, 3500000, 4000000 +#endif +}; + +#ifndef __sparc__ +static const tcflag_t baud_bits[] = { + B0, B50, B75, B110, B134, B150, B200, B300, B600, + B1200, B1800, B2400, B4800, B9600, B19200, B38400, + B57600, B115200, B230400, B460800, B500000, B576000, + B921600, B1000000, B1152000, B1500000, B2000000, B2500000, + B3000000, B3500000, B4000000 +}; +#else +static const tcflag_t baud_bits[] = { + B0, B50, B75, B110, B134, B150, B200, B300, B600, + B1200, B1800, B2400, B4800, B9600, B19200, B38400, + B57600, B115200, B230400, B460800, B76800, B153600, + B307200, B614400, B921600 +}; +#endif + +static int n_baud_table = ARRAY_SIZE(baud_table); + +/** + * tty_termios_baud_rate + * @termios: termios structure + * + * Convert termios baud rate data into a speed. This should be called + * with the termios lock held if this termios is a terminal termios + * structure. May change the termios data. Device drivers can call this + * function but should use ->c_[io]speed directly as they are updated. + * + * Locking: none + */ + +speed_t tty_termios_baud_rate(struct ktermios *termios) +{ + unsigned int cbaud; + + cbaud = termios->c_cflag & CBAUD; + +#ifdef BOTHER + /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ + if (cbaud == BOTHER) + return termios->c_ospeed; +#endif + if (cbaud & CBAUDEX) { + cbaud &= ~CBAUDEX; + + if (cbaud < 1 || cbaud + 15 > n_baud_table) + termios->c_cflag &= ~CBAUDEX; + else + cbaud += 15; + } + return baud_table[cbaud]; +} +EXPORT_SYMBOL(tty_termios_baud_rate); + +/** + * tty_termios_input_baud_rate + * @termios: termios structure + * + * Convert termios baud rate data into a speed. This should be called + * with the termios lock held if this termios is a terminal termios + * structure. May change the termios data. Device drivers can call this + * function but should use ->c_[io]speed directly as they are updated. + * + * Locking: none + */ + +speed_t tty_termios_input_baud_rate(struct ktermios *termios) +{ +#ifdef IBSHIFT + unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; + + if (cbaud == B0) + return tty_termios_baud_rate(termios); + + /* Magic token for arbitrary speed via c_ispeed*/ + if (cbaud == BOTHER) + return termios->c_ispeed; + + if (cbaud & CBAUDEX) { + cbaud &= ~CBAUDEX; + + if (cbaud < 1 || cbaud + 15 > n_baud_table) + termios->c_cflag &= ~(CBAUDEX << IBSHIFT); + else + cbaud += 15; + } + return baud_table[cbaud]; +#else + return tty_termios_baud_rate(termios); +#endif +} +EXPORT_SYMBOL(tty_termios_input_baud_rate); + +/** + * tty_termios_encode_baud_rate + * @termios: ktermios structure holding user requested state + * @ispeed: input speed + * @ospeed: output speed + * + * Encode the speeds set into the passed termios structure. This is + * used as a library helper for drivers so that they can report back + * the actual speed selected when it differs from the speed requested + * + * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour + * we need to carefully set the bits when the user does not get the + * desired speed. We allow small margins and preserve as much of possible + * of the input intent to keep compatibility. + * + * Locking: Caller should hold termios lock. This is already held + * when calling this function from the driver termios handler. + * + * The ifdefs deal with platforms whose owners have yet to update them + * and will all go away once this is done. + */ + +void tty_termios_encode_baud_rate(struct ktermios *termios, + speed_t ibaud, speed_t obaud) +{ + int i = 0; + int ifound = -1, ofound = -1; + int iclose = ibaud/50, oclose = obaud/50; + int ibinput = 0; + + if (obaud == 0) /* CD dropped */ + ibaud = 0; /* Clear ibaud to be sure */ + + termios->c_ispeed = ibaud; + termios->c_ospeed = obaud; + +#ifdef BOTHER + /* If the user asked for a precise weird speed give a precise weird + answer. If they asked for a Bfoo speed they may have problems + digesting non-exact replies so fuzz a bit */ + + if ((termios->c_cflag & CBAUD) == BOTHER) + oclose = 0; + if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) + iclose = 0; + if ((termios->c_cflag >> IBSHIFT) & CBAUD) + ibinput = 1; /* An input speed was specified */ +#endif + termios->c_cflag &= ~CBAUD; + + /* + * Our goal is to find a close match to the standard baud rate + * returned. Walk the baud rate table and if we get a very close + * match then report back the speed as a POSIX Bxxxx value by + * preference + */ + + do { + if (obaud - oclose <= baud_table[i] && + obaud + oclose >= baud_table[i]) { + termios->c_cflag |= baud_bits[i]; + ofound = i; + } + if (ibaud - iclose <= baud_table[i] && + ibaud + iclose >= baud_table[i]) { + /* For the case input == output don't set IBAUD bits + if the user didn't do so */ + if (ofound == i && !ibinput) + ifound = i; +#ifdef IBSHIFT + else { + ifound = i; + termios->c_cflag |= (baud_bits[i] << IBSHIFT); + } +#endif + } + } while (++i < n_baud_table); + + /* + * If we found no match then use BOTHER if provided or warn + * the user their platform maintainer needs to wake up if not. + */ +#ifdef BOTHER + if (ofound == -1) + termios->c_cflag |= BOTHER; + /* Set exact input bits only if the input and output differ or the + user already did */ + if (ifound == -1 && (ibaud != obaud || ibinput)) + termios->c_cflag |= (BOTHER << IBSHIFT); +#else + if (ifound == -1 || ofound == -1) + pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n"); +#endif +} +EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); + +/** + * tty_encode_baud_rate - set baud rate of the tty + * @ibaud: input baud rate + * @obad: output baud rate + * + * Update the current termios data for the tty with the new speed + * settings. The caller must hold the termios_rwsem for the tty in + * question. + */ + +void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) +{ + tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud); +} +EXPORT_SYMBOL_GPL(tty_encode_baud_rate); diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 309d25065bb6..0c150b5a9dd6 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -377,65 +377,6 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line) EXPORT_SYMBOL_GPL(tty_find_polling_driver); #endif -static int is_ignored(int sig) -{ - return (sigismember(¤t->blocked, sig) || - current->sighand->action[sig-1].sa.sa_handler == SIG_IGN); -} - -/** - * tty_check_change - check for POSIX terminal changes - * @tty: tty to check - * - * If we try to write to, or set the state of, a terminal and we're - * not in the foreground, send a SIGTTOU. If the signal is blocked or - * ignored, go ahead and perform the operation. (POSIX 7.2) - * - * Locking: ctrl_lock - */ - -int __tty_check_change(struct tty_struct *tty, int sig) -{ - unsigned long flags; - struct pid *pgrp, *tty_pgrp; - int ret = 0; - - if (current->signal->tty != tty) - return 0; - - rcu_read_lock(); - pgrp = task_pgrp(current); - - spin_lock_irqsave(&tty->ctrl_lock, flags); - tty_pgrp = tty->pgrp; - spin_unlock_irqrestore(&tty->ctrl_lock, flags); - - if (tty_pgrp && pgrp != tty->pgrp) { - if (is_ignored(sig)) { - if (sig == SIGTTIN) - ret = -EIO; - } else if (is_current_pgrp_orphaned()) - ret = -EIO; - else { - kill_pgrp(pgrp, sig, 1); - set_thread_flag(TIF_SIGPENDING); - ret = -ERESTARTSYS; - } - } - rcu_read_unlock(); - - if (!tty_pgrp) - tty_warn(tty, "sig=%d, tty->pgrp == NULL!\n", sig); - - return ret; -} - -int tty_check_change(struct tty_struct *tty) -{ - return __tty_check_change(tty, SIGTTOU); -} -EXPORT_SYMBOL(tty_check_change); - static ssize_t hung_up_tty_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -509,79 +450,6 @@ static const struct file_operations hung_up_tty_fops = { static DEFINE_SPINLOCK(redirect_lock); static struct file *redirect; - -void proc_clear_tty(struct task_struct *p) -{ - unsigned long flags; - struct tty_struct *tty; - spin_lock_irqsave(&p->sighand->siglock, flags); - tty = p->signal->tty; - p->signal->tty = NULL; - spin_unlock_irqrestore(&p->sighand->siglock, flags); - tty_kref_put(tty); -} - -/** - * proc_set_tty - set the controlling terminal - * - * Only callable by the session leader and only if it does not already have - * a controlling terminal. - * - * Caller must hold: tty_lock() - * a readlock on tasklist_lock - * sighand lock - */ -static void __proc_set_tty(struct tty_struct *tty) -{ - unsigned long flags; - - spin_lock_irqsave(&tty->ctrl_lock, flags); - /* - * The session and fg pgrp references will be non-NULL if - * tiocsctty() is stealing the controlling tty - */ - put_pid(tty->session); - put_pid(tty->pgrp); - tty->pgrp = get_pid(task_pgrp(current)); - spin_unlock_irqrestore(&tty->ctrl_lock, flags); - tty->session = get_pid(task_session(current)); - if (current->signal->tty) { - tty_debug(tty, "current tty %s not NULL!!\n", - current->signal->tty->name); - tty_kref_put(current->signal->tty); - } - put_pid(current->signal->tty_old_pgrp); - current->signal->tty = tty_kref_get(tty); - current->signal->tty_old_pgrp = NULL; -} - -static void proc_set_tty(struct tty_struct *tty) -{ - spin_lock_irq(¤t->sighand->siglock); - __proc_set_tty(tty); - spin_unlock_irq(¤t->sighand->siglock); -} - -struct tty_struct *get_current_tty(void) -{ - struct tty_struct *tty; - unsigned long flags; - - spin_lock_irqsave(¤t->sighand->siglock, flags); - tty = tty_kref_get(current->signal->tty); - spin_unlock_irqrestore(¤t->sighand->siglock, flags); - return tty; -} -EXPORT_SYMBOL_GPL(get_current_tty); - -static void session_clear_tty(struct pid *session) -{ - struct task_struct *p; - do_each_pid_task(session, PIDTYPE_SID, p) { - proc_clear_tty(p); - } while_each_pid_task(session, PIDTYPE_SID, p); -} - /** * tty_wakeup - request more data * @tty: terminal @@ -609,60 +477,6 @@ void tty_wakeup(struct tty_struct *tty) EXPORT_SYMBOL_GPL(tty_wakeup); /** - * tty_signal_session_leader - sends SIGHUP to session leader - * @tty controlling tty - * @exit_session if non-zero, signal all foreground group processes - * - * Send SIGHUP and SIGCONT to the session leader and its process group. - * Optionally, signal all processes in the foreground process group. - * - * Returns the number of processes in the session with this tty - * as their controlling terminal. This value is used to drop - * tty references for those processes. - */ -static int tty_signal_session_leader(struct tty_struct *tty, int exit_session) -{ - struct task_struct *p; - int refs = 0; - struct pid *tty_pgrp = NULL; - - read_lock(&tasklist_lock); - if (tty->session) { - do_each_pid_task(tty->session, PIDTYPE_SID, p) { - spin_lock_irq(&p->sighand->siglock); - if (p->signal->tty == tty) { - p->signal->tty = NULL; - /* We defer the dereferences outside fo - the tasklist lock */ - refs++; - } - if (!p->signal->leader) { - spin_unlock_irq(&p->sighand->siglock); - continue; - } - __group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p); - __group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p); - put_pid(p->signal->tty_old_pgrp); /* A noop */ - spin_lock(&tty->ctrl_lock); - tty_pgrp = get_pid(tty->pgrp); - if (tty->pgrp) - p->signal->tty_old_pgrp = get_pid(tty->pgrp); - spin_unlock(&tty->ctrl_lock); - spin_unlock_irq(&p->sighand->siglock); - } while_each_pid_task(tty->session, PIDTYPE_SID, p); - } - read_unlock(&tasklist_lock); - - if (tty_pgrp) { - if (exit_session) - kill_pgrp(tty_pgrp, SIGHUP, exit_session); - put_pid(tty_pgrp); - } - - return refs; -} - -/** * __tty_hangup - actual handler for hangup events * @work: tty device * @@ -840,7 +654,7 @@ void tty_vhangup_self(void) * is complete. That guarantee is necessary for security reasons. */ -static void tty_vhangup_session(struct tty_struct *tty) +void tty_vhangup_session(struct tty_struct *tty) { tty_debug_hangup(tty, "session hangup\n"); __tty_hangup(tty, 1); @@ -862,106 +676,6 @@ int tty_hung_up_p(struct file *filp) EXPORT_SYMBOL(tty_hung_up_p); /** - * disassociate_ctty - disconnect controlling tty - * @on_exit: true if exiting so need to "hang up" the session - * - * This function is typically called only by the session leader, when - * it wants to disassociate itself from its controlling tty. - * - * It performs the following functions: - * (1) Sends a SIGHUP and SIGCONT to the foreground process group - * (2) Clears the tty from being controlling the session - * (3) Clears the controlling tty for all processes in the - * session group. - * - * The argument on_exit is set to 1 if called when a process is - * exiting; it is 0 if called by the ioctl TIOCNOTTY. - * - * Locking: - * BTM is taken for hysterical raisins, and held when - * called from no_tty(). - * tty_mutex is taken to protect tty - * ->siglock is taken to protect ->signal/->sighand - * tasklist_lock is taken to walk process list for sessions - * ->siglock is taken to protect ->signal/->sighand - */ - -void disassociate_ctty(int on_exit) -{ - struct tty_struct *tty; - - if (!current->signal->leader) - return; - - tty = get_current_tty(); - if (tty) { - if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY) { - tty_vhangup_session(tty); - } else { - struct pid *tty_pgrp = tty_get_pgrp(tty); - if (tty_pgrp) { - kill_pgrp(tty_pgrp, SIGHUP, on_exit); - if (!on_exit) - kill_pgrp(tty_pgrp, SIGCONT, on_exit); - put_pid(tty_pgrp); - } - } - tty_kref_put(tty); - - } else if (on_exit) { - struct pid *old_pgrp; - spin_lock_irq(¤t->sighand->siglock); - old_pgrp = current->signal->tty_old_pgrp; - current->signal->tty_old_pgrp = NULL; - spin_unlock_irq(¤t->sighand->siglock); - if (old_pgrp) { - kill_pgrp(old_pgrp, SIGHUP, on_exit); - kill_pgrp(old_pgrp, SIGCONT, on_exit); - put_pid(old_pgrp); - } - return; - } - - spin_lock_irq(¤t->sighand->siglock); - put_pid(current->signal->tty_old_pgrp); - current->signal->tty_old_pgrp = NULL; - - tty = tty_kref_get(current->signal->tty); - if (tty) { - unsigned long flags; - spin_lock_irqsave(&tty->ctrl_lock, flags); - put_pid(tty->session); - put_pid(tty->pgrp); - tty->session = NULL; - tty->pgrp = NULL; - spin_unlock_irqrestore(&tty->ctrl_lock, flags); - tty_kref_put(tty); - } else - tty_debug_hangup(tty, "no current tty\n"); - - spin_unlock_irq(¤t->sighand->siglock); - /* Now clear signal->tty under the lock */ - read_lock(&tasklist_lock); - session_clear_tty(task_session(current)); - read_unlock(&tasklist_lock); -} - -/** - * - * no_tty - Ensure the current process does not have a controlling tty - */ -void no_tty(void) -{ - /* FIXME: Review locking here. The tty_lock never covered any race - between a new association and proc_clear_tty but possible we need - to protect against this anyway */ - struct task_struct *tsk = current; - disassociate_ctty(0); - proc_clear_tty(tsk); -} - - -/** * stop_tty - propagate flow control * @tty: tty to stop * @@ -1520,7 +1234,7 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx) * This code guarantees that either everything succeeds and the * TTY is ready for operation, or else the table slots are vacated * and the allocated memory released. (Except that the termios - * and locked termios may be retained.) + * may be retained.) */ if (!try_module_get(driver->owner)) @@ -2163,38 +1877,13 @@ retry_open: } clear_bit(TTY_HUPPED, &tty->flags); - - read_lock(&tasklist_lock); - spin_lock_irq(¤t->sighand->siglock); noctty = (filp->f_flags & O_NOCTTY) || - (IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) || - device == MKDEV(TTYAUX_MAJOR, 1) || - (tty->driver->type == TTY_DRIVER_TYPE_PTY && - tty->driver->subtype == PTY_TYPE_MASTER); - - if (!noctty && - current->signal->leader && - !current->signal->tty && - tty->session == NULL) { - /* - * Don't let a process that only has write access to the tty - * obtain the privileges associated with having a tty as - * controlling terminal (being able to reopen it with full - * access through /dev/tty, being able to perform pushback). - * Many distributions set the group of all ttys to "tty" and - * grant write-only access to all terminals for setgid tty - * binaries, which should not imply full privileges on all ttys. - * - * This could theoretically break old code that performs open() - * on a write-only file descriptor. In that case, it might be - * necessary to also permit this if - * inode_permission(inode, MAY_READ) == 0. - */ - if (filp->f_mode & FMODE_READ) - __proc_set_tty(tty); - } - spin_unlock_irq(¤t->sighand->siglock); - read_unlock(&tasklist_lock); + (IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) || + device == MKDEV(TTYAUX_MAJOR, 1) || + (tty->driver->type == TTY_DRIVER_TYPE_PTY && + tty->driver->subtype == PTY_TYPE_MASTER); + if (!noctty) + tty_open_proc_set_tty(filp, tty); tty_unlock(tty); return 0; } @@ -2457,211 +2146,6 @@ static int fionbio(struct file *file, int __user *p) } /** - * tiocsctty - set controlling tty - * @tty: tty structure - * @arg: user argument - * - * This ioctl is used to manage job control. It permits a session - * leader to set this tty as the controlling tty for the session. - * - * Locking: - * Takes tty_lock() to serialize proc_set_tty() for this tty - * Takes tasklist_lock internally to walk sessions - * Takes ->siglock() when updating signal->tty - */ - -static int tiocsctty(struct tty_struct *tty, struct file *file, int arg) -{ - int ret = 0; - - tty_lock(tty); - read_lock(&tasklist_lock); - - if (current->signal->leader && (task_session(current) == tty->session)) - goto unlock; - - /* - * The process must be a session leader and - * not have a controlling tty already. - */ - if (!current->signal->leader || current->signal->tty) { - ret = -EPERM; - goto unlock; - } - - if (tty->session) { - /* - * This tty is already the controlling - * tty for another session group! - */ - if (arg == 1 && capable(CAP_SYS_ADMIN)) { - /* - * Steal it away - */ - session_clear_tty(tty->session); - } else { - ret = -EPERM; - goto unlock; - } - } - - /* See the comment in tty_open(). */ - if ((file->f_mode & FMODE_READ) == 0 && !capable(CAP_SYS_ADMIN)) { - ret = -EPERM; - goto unlock; - } - - proc_set_tty(tty); -unlock: - read_unlock(&tasklist_lock); - tty_unlock(tty); - return ret; -} - -/** - * tty_get_pgrp - return a ref counted pgrp pid - * @tty: tty to read - * - * Returns a refcounted instance of the pid struct for the process - * group controlling the tty. - */ - -struct pid *tty_get_pgrp(struct tty_struct *tty) -{ - unsigned long flags; - struct pid *pgrp; - - spin_lock_irqsave(&tty->ctrl_lock, flags); - pgrp = get_pid(tty->pgrp); - spin_unlock_irqrestore(&tty->ctrl_lock, flags); - - return pgrp; -} -EXPORT_SYMBOL_GPL(tty_get_pgrp); - -/* - * This checks not only the pgrp, but falls back on the pid if no - * satisfactory pgrp is found. I dunno - gdb doesn't work correctly - * without this... - * - * The caller must hold rcu lock or the tasklist lock. - */ -static struct pid *session_of_pgrp(struct pid *pgrp) -{ - struct task_struct *p; - struct pid *sid = NULL; - - p = pid_task(pgrp, PIDTYPE_PGID); - if (p == NULL) - p = pid_task(pgrp, PIDTYPE_PID); - if (p != NULL) - sid = task_session(p); - - return sid; -} - -/** - * tiocgpgrp - get process group - * @tty: tty passed by user - * @real_tty: tty side of the tty passed by the user if a pty else the tty - * @p: returned pid - * - * Obtain the process group of the tty. If there is no process group - * return an error. - * - * Locking: none. Reference to current->signal->tty is safe. - */ - -static int tiocgpgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) -{ - struct pid *pid; - int ret; - /* - * (tty == real_tty) is a cheap way of - * testing if the tty is NOT a master pty. - */ - if (tty == real_tty && current->signal->tty != real_tty) - return -ENOTTY; - pid = tty_get_pgrp(real_tty); - ret = put_user(pid_vnr(pid), p); - put_pid(pid); - return ret; -} - -/** - * tiocspgrp - attempt to set process group - * @tty: tty passed by user - * @real_tty: tty side device matching tty passed by user - * @p: pid pointer - * - * Set the process group of the tty to the session passed. Only - * permitted where the tty session is our session. - * - * Locking: RCU, ctrl lock - */ - -static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) -{ - struct pid *pgrp; - pid_t pgrp_nr; - int retval = tty_check_change(real_tty); - - if (retval == -EIO) - return -ENOTTY; - if (retval) - return retval; - if (!current->signal->tty || - (current->signal->tty != real_tty) || - (real_tty->session != task_session(current))) - return -ENOTTY; - if (get_user(pgrp_nr, p)) - return -EFAULT; - if (pgrp_nr < 0) - return -EINVAL; - rcu_read_lock(); - pgrp = find_vpid(pgrp_nr); - retval = -ESRCH; - if (!pgrp) - goto out_unlock; - retval = -EPERM; - if (session_of_pgrp(pgrp) != task_session(current)) - goto out_unlock; - retval = 0; - spin_lock_irq(&tty->ctrl_lock); - put_pid(real_tty->pgrp); - real_tty->pgrp = get_pid(pgrp); - spin_unlock_irq(&tty->ctrl_lock); -out_unlock: - rcu_read_unlock(); - return retval; -} - -/** - * tiocgsid - get session id - * @tty: tty passed by user - * @real_tty: tty side of the tty passed by the user if a pty else the tty - * @p: pointer to returned session id - * - * Obtain the session id of the tty. If there is no session - * return an error. - * - * Locking: none. Reference to current->signal->tty is safe. - */ - -static int tiocgsid(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) -{ - /* - * (tty == real_tty) is a cheap way of - * testing if the tty is NOT a master pty. - */ - if (tty == real_tty && current->signal->tty != real_tty) - return -ENOTTY; - if (!real_tty->session) - return -ENOTTY; - return put_user(pid_vnr(real_tty->session), p); -} - -/** * tiocsetd - set line discipline * @tty: tty device * @p: pointer to user data @@ -2843,8 +2327,8 @@ static void tty_warn_deprecated_flags(struct serial_struct __user *ss) flags &= ASYNC_DEPRECATED; if (flags && __ratelimit(&depr_flags)) - pr_warning("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", - __func__, get_task_comm(comm, current), flags); + pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", + __func__, get_task_comm(comm, current), flags); } /* @@ -2920,19 +2404,6 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) int excl = test_bit(TTY_EXCLUSIVE, &tty->flags); return put_user(excl, (int __user *)p); } - case TIOCNOTTY: - if (current->signal->tty != tty) - return -ENOTTY; - no_tty(); - return 0; - case TIOCSCTTY: - return tiocsctty(real_tty, file, arg); - case TIOCGPGRP: - return tiocgpgrp(tty, real_tty, p); - case TIOCSPGRP: - return tiocspgrp(tty, real_tty, p); - case TIOCGSID: - return tiocgsid(tty, real_tty, p); case TIOCGETD: return tiocgetd(tty, p); case TIOCSETD: @@ -2993,6 +2464,10 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case TIOCSSERIAL: tty_warn_deprecated_flags(p); break; + default: + retval = tty_jobctrl_ioctl(tty, real_tty, file, cmd, arg); + if (retval != -ENOIOCTLCMD) + return retval; } if (tty->ops->ioctl) { retval = tty->ops->ioctl(tty, cmd, arg); @@ -3293,9 +2768,9 @@ struct device *tty_register_device_attr(struct tty_driver *driver, { char name[64]; dev_t devt = MKDEV(driver->major, driver->minor_start) + index; - struct device *dev = NULL; - int retval = -ENODEV; - bool cdev = false; + struct ktermios *tp; + struct device *dev; + int retval; if (index >= driver->num) { pr_err("%s: Attempt to register invalid tty line number (%d)\n", @@ -3308,18 +2783,9 @@ struct device *tty_register_device_attr(struct tty_driver *driver, else tty_line_name(driver, index, name); - if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { - retval = tty_cdev_add(driver, devt, index, 1); - if (retval) - goto error; - cdev = true; - } - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (!dev) { - retval = -ENOMEM; - goto error; - } + if (!dev) + return ERR_PTR(-ENOMEM); dev->devt = devt; dev->class = tty_class; @@ -3329,18 +2795,38 @@ struct device *tty_register_device_attr(struct tty_driver *driver, dev->groups = attr_grp; dev_set_drvdata(dev, drvdata); + dev_set_uevent_suppress(dev, 1); + retval = device_register(dev); if (retval) - goto error; + goto err_put; + + if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { + /* + * Free any saved termios data so that the termios state is + * reset when reusing a minor number. + */ + tp = driver->termios[index]; + if (tp) { + driver->termios[index] = NULL; + kfree(tp); + } + + retval = tty_cdev_add(driver, devt, index, 1); + if (retval) + goto err_del; + } + + dev_set_uevent_suppress(dev, 0); + kobject_uevent(&dev->kobj, KOBJ_ADD); return dev; -error: +err_del: + device_del(dev); +err_put: put_device(dev); - if (cdev) { - cdev_del(driver->cdevs[index]); - driver->cdevs[index] = NULL; - } + return ERR_PTR(retval); } EXPORT_SYMBOL_GPL(tty_register_device_attr); @@ -3441,11 +2927,6 @@ static void destruct_tty_driver(struct kref *kref) struct ktermios *tp; if (driver->flags & TTY_DRIVER_INSTALLED) { - /* - * Free the termios and termios_locked structures because - * we don't want to get memory leaks when modular tty - * drivers are removed from the kernel. - */ for (i = 0; i < driver->num; i++) { tp = driver->termios[i]; if (tp) { @@ -3578,30 +3059,6 @@ void tty_default_fops(struct file_operations *fops) *fops = tty_fops; } -/* - * Initialize the console device. This is called *early*, so - * we can't necessarily depend on lots of kernel help here. - * Just do some early initializations, and do the complex setup - * later. - */ -void __init console_init(void) -{ - initcall_t *call; - - /* Setup the default TTY line discipline. */ - n_tty_init(); - - /* - * set up the console device so that later boot sequences can - * inform about problems etc.. - */ - call = __con_initcall_start; - while (call < __con_initcall_end) { - (*call)(); - call++; - } -} - static char *tty_devnode(struct device *dev, umode_t *mode) { if (!mode) diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index a9a978731c5b..efa96e6c4c1b 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -258,228 +258,6 @@ static void unset_locked_termios(struct tty_struct *tty, struct ktermios *old) /* FIXME: What should we do for i/ospeed */ } -/* - * Routine which returns the baud rate of the tty - * - * Note that the baud_table needs to be kept in sync with the - * include/asm/termbits.h file. - */ -static const speed_t baud_table[] = { - 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, - 9600, 19200, 38400, 57600, 115200, 230400, 460800, -#ifdef __sparc__ - 76800, 153600, 307200, 614400, 921600 -#else - 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, - 2500000, 3000000, 3500000, 4000000 -#endif -}; - -#ifndef __sparc__ -static const tcflag_t baud_bits[] = { - B0, B50, B75, B110, B134, B150, B200, B300, B600, - B1200, B1800, B2400, B4800, B9600, B19200, B38400, - B57600, B115200, B230400, B460800, B500000, B576000, - B921600, B1000000, B1152000, B1500000, B2000000, B2500000, - B3000000, B3500000, B4000000 -}; -#else -static const tcflag_t baud_bits[] = { - B0, B50, B75, B110, B134, B150, B200, B300, B600, - B1200, B1800, B2400, B4800, B9600, B19200, B38400, - B57600, B115200, B230400, B460800, B76800, B153600, - B307200, B614400, B921600 -}; -#endif - -static int n_baud_table = ARRAY_SIZE(baud_table); - -/** - * tty_termios_baud_rate - * @termios: termios structure - * - * Convert termios baud rate data into a speed. This should be called - * with the termios lock held if this termios is a terminal termios - * structure. May change the termios data. Device drivers can call this - * function but should use ->c_[io]speed directly as they are updated. - * - * Locking: none - */ - -speed_t tty_termios_baud_rate(struct ktermios *termios) -{ - unsigned int cbaud; - - cbaud = termios->c_cflag & CBAUD; - -#ifdef BOTHER - /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ - if (cbaud == BOTHER) - return termios->c_ospeed; -#endif - if (cbaud & CBAUDEX) { - cbaud &= ~CBAUDEX; - - if (cbaud < 1 || cbaud + 15 > n_baud_table) - termios->c_cflag &= ~CBAUDEX; - else - cbaud += 15; - } - return baud_table[cbaud]; -} -EXPORT_SYMBOL(tty_termios_baud_rate); - -/** - * tty_termios_input_baud_rate - * @termios: termios structure - * - * Convert termios baud rate data into a speed. This should be called - * with the termios lock held if this termios is a terminal termios - * structure. May change the termios data. Device drivers can call this - * function but should use ->c_[io]speed directly as they are updated. - * - * Locking: none - */ - -speed_t tty_termios_input_baud_rate(struct ktermios *termios) -{ -#ifdef IBSHIFT - unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; - - if (cbaud == B0) - return tty_termios_baud_rate(termios); - - /* Magic token for arbitrary speed via c_ispeed*/ - if (cbaud == BOTHER) - return termios->c_ispeed; - - if (cbaud & CBAUDEX) { - cbaud &= ~CBAUDEX; - - if (cbaud < 1 || cbaud + 15 > n_baud_table) - termios->c_cflag &= ~(CBAUDEX << IBSHIFT); - else - cbaud += 15; - } - return baud_table[cbaud]; -#else - return tty_termios_baud_rate(termios); -#endif -} -EXPORT_SYMBOL(tty_termios_input_baud_rate); - -/** - * tty_termios_encode_baud_rate - * @termios: ktermios structure holding user requested state - * @ispeed: input speed - * @ospeed: output speed - * - * Encode the speeds set into the passed termios structure. This is - * used as a library helper for drivers so that they can report back - * the actual speed selected when it differs from the speed requested - * - * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour - * we need to carefully set the bits when the user does not get the - * desired speed. We allow small margins and preserve as much of possible - * of the input intent to keep compatibility. - * - * Locking: Caller should hold termios lock. This is already held - * when calling this function from the driver termios handler. - * - * The ifdefs deal with platforms whose owners have yet to update them - * and will all go away once this is done. - */ - -void tty_termios_encode_baud_rate(struct ktermios *termios, - speed_t ibaud, speed_t obaud) -{ - int i = 0; - int ifound = -1, ofound = -1; - int iclose = ibaud/50, oclose = obaud/50; - int ibinput = 0; - - if (obaud == 0) /* CD dropped */ - ibaud = 0; /* Clear ibaud to be sure */ - - termios->c_ispeed = ibaud; - termios->c_ospeed = obaud; - -#ifdef BOTHER - /* If the user asked for a precise weird speed give a precise weird - answer. If they asked for a Bfoo speed they may have problems - digesting non-exact replies so fuzz a bit */ - - if ((termios->c_cflag & CBAUD) == BOTHER) - oclose = 0; - if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) - iclose = 0; - if ((termios->c_cflag >> IBSHIFT) & CBAUD) - ibinput = 1; /* An input speed was specified */ -#endif - termios->c_cflag &= ~CBAUD; - - /* - * Our goal is to find a close match to the standard baud rate - * returned. Walk the baud rate table and if we get a very close - * match then report back the speed as a POSIX Bxxxx value by - * preference - */ - - do { - if (obaud - oclose <= baud_table[i] && - obaud + oclose >= baud_table[i]) { - termios->c_cflag |= baud_bits[i]; - ofound = i; - } - if (ibaud - iclose <= baud_table[i] && - ibaud + iclose >= baud_table[i]) { - /* For the case input == output don't set IBAUD bits - if the user didn't do so */ - if (ofound == i && !ibinput) - ifound = i; -#ifdef IBSHIFT - else { - ifound = i; - termios->c_cflag |= (baud_bits[i] << IBSHIFT); - } -#endif - } - } while (++i < n_baud_table); - - /* - * If we found no match then use BOTHER if provided or warn - * the user their platform maintainer needs to wake up if not. - */ -#ifdef BOTHER - if (ofound == -1) - termios->c_cflag |= BOTHER; - /* Set exact input bits only if the input and output differ or the - user already did */ - if (ifound == -1 && (ibaud != obaud || ibinput)) - termios->c_cflag |= (BOTHER << IBSHIFT); -#else - if (ifound == -1 || ofound == -1) - pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n"); -#endif -} -EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); - -/** - * tty_encode_baud_rate - set baud rate of the tty - * @ibaud: input baud rate - * @obad: output baud rate - * - * Update the current termios data for the tty with the new speed - * settings. The caller must hold the termios_rwsem for the tty in - * question. - */ - -void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) -{ - tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud); -} -EXPORT_SYMBOL_GPL(tty_encode_baud_rate); - /** * tty_termios_copy_hw - copy hardware settings * @new: New termios diff --git a/drivers/tty/tty_jobctrl.c b/drivers/tty/tty_jobctrl.c new file mode 100644 index 000000000000..e7032309ee87 --- /dev/null +++ b/drivers/tty/tty_jobctrl.c @@ -0,0 +1,554 @@ +/* + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/signal.h> +#include <linux/sched/signal.h> +#include <linux/sched/task.h> +#include <linux/tty.h> +#include <linux/fcntl.h> +#include <linux/uaccess.h> + +static int is_ignored(int sig) +{ + return (sigismember(¤t->blocked, sig) || + current->sighand->action[sig-1].sa.sa_handler == SIG_IGN); +} + +/** + * tty_check_change - check for POSIX terminal changes + * @tty: tty to check + * + * If we try to write to, or set the state of, a terminal and we're + * not in the foreground, send a SIGTTOU. If the signal is blocked or + * ignored, go ahead and perform the operation. (POSIX 7.2) + * + * Locking: ctrl_lock + */ +int __tty_check_change(struct tty_struct *tty, int sig) +{ + unsigned long flags; + struct pid *pgrp, *tty_pgrp; + int ret = 0; + + if (current->signal->tty != tty) + return 0; + + rcu_read_lock(); + pgrp = task_pgrp(current); + + spin_lock_irqsave(&tty->ctrl_lock, flags); + tty_pgrp = tty->pgrp; + spin_unlock_irqrestore(&tty->ctrl_lock, flags); + + if (tty_pgrp && pgrp != tty->pgrp) { + if (is_ignored(sig)) { + if (sig == SIGTTIN) + ret = -EIO; + } else if (is_current_pgrp_orphaned()) + ret = -EIO; + else { + kill_pgrp(pgrp, sig, 1); + set_thread_flag(TIF_SIGPENDING); + ret = -ERESTARTSYS; + } + } + rcu_read_unlock(); + + if (!tty_pgrp) + tty_warn(tty, "sig=%d, tty->pgrp == NULL!\n", sig); + + return ret; +} + +int tty_check_change(struct tty_struct *tty) +{ + return __tty_check_change(tty, SIGTTOU); +} +EXPORT_SYMBOL(tty_check_change); + +void proc_clear_tty(struct task_struct *p) +{ + unsigned long flags; + struct tty_struct *tty; + spin_lock_irqsave(&p->sighand->siglock, flags); + tty = p->signal->tty; + p->signal->tty = NULL; + spin_unlock_irqrestore(&p->sighand->siglock, flags); + tty_kref_put(tty); +} + +/** + * proc_set_tty - set the controlling terminal + * + * Only callable by the session leader and only if it does not already have + * a controlling terminal. + * + * Caller must hold: tty_lock() + * a readlock on tasklist_lock + * sighand lock + */ +static void __proc_set_tty(struct tty_struct *tty) +{ + unsigned long flags; + + spin_lock_irqsave(&tty->ctrl_lock, flags); + /* + * The session and fg pgrp references will be non-NULL if + * tiocsctty() is stealing the controlling tty + */ + put_pid(tty->session); + put_pid(tty->pgrp); + tty->pgrp = get_pid(task_pgrp(current)); + spin_unlock_irqrestore(&tty->ctrl_lock, flags); + tty->session = get_pid(task_session(current)); + if (current->signal->tty) { + tty_debug(tty, "current tty %s not NULL!!\n", + current->signal->tty->name); + tty_kref_put(current->signal->tty); + } + put_pid(current->signal->tty_old_pgrp); + current->signal->tty = tty_kref_get(tty); + current->signal->tty_old_pgrp = NULL; +} + +static void proc_set_tty(struct tty_struct *tty) +{ + spin_lock_irq(¤t->sighand->siglock); + __proc_set_tty(tty); + spin_unlock_irq(¤t->sighand->siglock); +} + +/* + * Called by tty_open() to set the controlling tty if applicable. + */ +void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty) +{ + read_lock(&tasklist_lock); + spin_lock_irq(¤t->sighand->siglock); + if (current->signal->leader && + !current->signal->tty && + tty->session == NULL) { + /* + * Don't let a process that only has write access to the tty + * obtain the privileges associated with having a tty as + * controlling terminal (being able to reopen it with full + * access through /dev/tty, being able to perform pushback). + * Many distributions set the group of all ttys to "tty" and + * grant write-only access to all terminals for setgid tty + * binaries, which should not imply full privileges on all ttys. + * + * This could theoretically break old code that performs open() + * on a write-only file descriptor. In that case, it might be + * necessary to also permit this if + * inode_permission(inode, MAY_READ) == 0. + */ + if (filp->f_mode & FMODE_READ) + __proc_set_tty(tty); + } + spin_unlock_irq(¤t->sighand->siglock); + read_unlock(&tasklist_lock); +} + +struct tty_struct *get_current_tty(void) +{ + struct tty_struct *tty; + unsigned long flags; + + spin_lock_irqsave(¤t->sighand->siglock, flags); + tty = tty_kref_get(current->signal->tty); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); + return tty; +} +EXPORT_SYMBOL_GPL(get_current_tty); + +/* + * Called from tty_release(). + */ +void session_clear_tty(struct pid *session) +{ + struct task_struct *p; + do_each_pid_task(session, PIDTYPE_SID, p) { + proc_clear_tty(p); + } while_each_pid_task(session, PIDTYPE_SID, p); +} + +/** + * tty_signal_session_leader - sends SIGHUP to session leader + * @tty controlling tty + * @exit_session if non-zero, signal all foreground group processes + * + * Send SIGHUP and SIGCONT to the session leader and its process group. + * Optionally, signal all processes in the foreground process group. + * + * Returns the number of processes in the session with this tty + * as their controlling terminal. This value is used to drop + * tty references for those processes. + */ +int tty_signal_session_leader(struct tty_struct *tty, int exit_session) +{ + struct task_struct *p; + int refs = 0; + struct pid *tty_pgrp = NULL; + + read_lock(&tasklist_lock); + if (tty->session) { + do_each_pid_task(tty->session, PIDTYPE_SID, p) { + spin_lock_irq(&p->sighand->siglock); + if (p->signal->tty == tty) { + p->signal->tty = NULL; + /* We defer the dereferences outside fo + the tasklist lock */ + refs++; + } + if (!p->signal->leader) { + spin_unlock_irq(&p->sighand->siglock); + continue; + } + __group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p); + __group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p); + put_pid(p->signal->tty_old_pgrp); /* A noop */ + spin_lock(&tty->ctrl_lock); + tty_pgrp = get_pid(tty->pgrp); + if (tty->pgrp) + p->signal->tty_old_pgrp = get_pid(tty->pgrp); + spin_unlock(&tty->ctrl_lock); + spin_unlock_irq(&p->sighand->siglock); + } while_each_pid_task(tty->session, PIDTYPE_SID, p); + } + read_unlock(&tasklist_lock); + + if (tty_pgrp) { + if (exit_session) + kill_pgrp(tty_pgrp, SIGHUP, exit_session); + put_pid(tty_pgrp); + } + + return refs; +} + +/** + * disassociate_ctty - disconnect controlling tty + * @on_exit: true if exiting so need to "hang up" the session + * + * This function is typically called only by the session leader, when + * it wants to disassociate itself from its controlling tty. + * + * It performs the following functions: + * (1) Sends a SIGHUP and SIGCONT to the foreground process group + * (2) Clears the tty from being controlling the session + * (3) Clears the controlling tty for all processes in the + * session group. + * + * The argument on_exit is set to 1 if called when a process is + * exiting; it is 0 if called by the ioctl TIOCNOTTY. + * + * Locking: + * BTM is taken for hysterical raisons, and held when + * called from no_tty(). + * tty_mutex is taken to protect tty + * ->siglock is taken to protect ->signal/->sighand + * tasklist_lock is taken to walk process list for sessions + * ->siglock is taken to protect ->signal/->sighand + */ +void disassociate_ctty(int on_exit) +{ + struct tty_struct *tty; + + if (!current->signal->leader) + return; + + tty = get_current_tty(); + if (tty) { + if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY) { + tty_vhangup_session(tty); + } else { + struct pid *tty_pgrp = tty_get_pgrp(tty); + if (tty_pgrp) { + kill_pgrp(tty_pgrp, SIGHUP, on_exit); + if (!on_exit) + kill_pgrp(tty_pgrp, SIGCONT, on_exit); + put_pid(tty_pgrp); + } + } + tty_kref_put(tty); + + } else if (on_exit) { + struct pid *old_pgrp; + spin_lock_irq(¤t->sighand->siglock); + old_pgrp = current->signal->tty_old_pgrp; + current->signal->tty_old_pgrp = NULL; + spin_unlock_irq(¤t->sighand->siglock); + if (old_pgrp) { + kill_pgrp(old_pgrp, SIGHUP, on_exit); + kill_pgrp(old_pgrp, SIGCONT, on_exit); + put_pid(old_pgrp); + } + return; + } + + spin_lock_irq(¤t->sighand->siglock); + put_pid(current->signal->tty_old_pgrp); + current->signal->tty_old_pgrp = NULL; + + tty = tty_kref_get(current->signal->tty); + if (tty) { + unsigned long flags; + spin_lock_irqsave(&tty->ctrl_lock, flags); + put_pid(tty->session); + put_pid(tty->pgrp); + tty->session = NULL; + tty->pgrp = NULL; + spin_unlock_irqrestore(&tty->ctrl_lock, flags); + tty_kref_put(tty); + } + + spin_unlock_irq(¤t->sighand->siglock); + /* Now clear signal->tty under the lock */ + read_lock(&tasklist_lock); + session_clear_tty(task_session(current)); + read_unlock(&tasklist_lock); +} + +/** + * + * no_tty - Ensure the current process does not have a controlling tty + */ +void no_tty(void) +{ + /* FIXME: Review locking here. The tty_lock never covered any race + between a new association and proc_clear_tty but possible we need + to protect against this anyway */ + struct task_struct *tsk = current; + disassociate_ctty(0); + proc_clear_tty(tsk); +} + +/** + * tiocsctty - set controlling tty + * @tty: tty structure + * @arg: user argument + * + * This ioctl is used to manage job control. It permits a session + * leader to set this tty as the controlling tty for the session. + * + * Locking: + * Takes tty_lock() to serialize proc_set_tty() for this tty + * Takes tasklist_lock internally to walk sessions + * Takes ->siglock() when updating signal->tty + */ +static int tiocsctty(struct tty_struct *tty, struct file *file, int arg) +{ + int ret = 0; + + tty_lock(tty); + read_lock(&tasklist_lock); + + if (current->signal->leader && (task_session(current) == tty->session)) + goto unlock; + + /* + * The process must be a session leader and + * not have a controlling tty already. + */ + if (!current->signal->leader || current->signal->tty) { + ret = -EPERM; + goto unlock; + } + + if (tty->session) { + /* + * This tty is already the controlling + * tty for another session group! + */ + if (arg == 1 && capable(CAP_SYS_ADMIN)) { + /* + * Steal it away + */ + session_clear_tty(tty->session); + } else { + ret = -EPERM; + goto unlock; + } + } + + /* See the comment in tty_open_proc_set_tty(). */ + if ((file->f_mode & FMODE_READ) == 0 && !capable(CAP_SYS_ADMIN)) { + ret = -EPERM; + goto unlock; + } + + proc_set_tty(tty); +unlock: + read_unlock(&tasklist_lock); + tty_unlock(tty); + return ret; +} + +/** + * tty_get_pgrp - return a ref counted pgrp pid + * @tty: tty to read + * + * Returns a refcounted instance of the pid struct for the process + * group controlling the tty. + */ +struct pid *tty_get_pgrp(struct tty_struct *tty) +{ + unsigned long flags; + struct pid *pgrp; + + spin_lock_irqsave(&tty->ctrl_lock, flags); + pgrp = get_pid(tty->pgrp); + spin_unlock_irqrestore(&tty->ctrl_lock, flags); + + return pgrp; +} +EXPORT_SYMBOL_GPL(tty_get_pgrp); + +/* + * This checks not only the pgrp, but falls back on the pid if no + * satisfactory pgrp is found. I dunno - gdb doesn't work correctly + * without this... + * + * The caller must hold rcu lock or the tasklist lock. + */ +static struct pid *session_of_pgrp(struct pid *pgrp) +{ + struct task_struct *p; + struct pid *sid = NULL; + + p = pid_task(pgrp, PIDTYPE_PGID); + if (p == NULL) + p = pid_task(pgrp, PIDTYPE_PID); + if (p != NULL) + sid = task_session(p); + + return sid; +} + +/** + * tiocgpgrp - get process group + * @tty: tty passed by user + * @real_tty: tty side of the tty passed by the user if a pty else the tty + * @p: returned pid + * + * Obtain the process group of the tty. If there is no process group + * return an error. + * + * Locking: none. Reference to current->signal->tty is safe. + */ +static int tiocgpgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) +{ + struct pid *pid; + int ret; + /* + * (tty == real_tty) is a cheap way of + * testing if the tty is NOT a master pty. + */ + if (tty == real_tty && current->signal->tty != real_tty) + return -ENOTTY; + pid = tty_get_pgrp(real_tty); + ret = put_user(pid_vnr(pid), p); + put_pid(pid); + return ret; +} + +/** + * tiocspgrp - attempt to set process group + * @tty: tty passed by user + * @real_tty: tty side device matching tty passed by user + * @p: pid pointer + * + * Set the process group of the tty to the session passed. Only + * permitted where the tty session is our session. + * + * Locking: RCU, ctrl lock + */ +static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) +{ + struct pid *pgrp; + pid_t pgrp_nr; + int retval = tty_check_change(real_tty); + + if (retval == -EIO) + return -ENOTTY; + if (retval) + return retval; + if (!current->signal->tty || + (current->signal->tty != real_tty) || + (real_tty->session != task_session(current))) + return -ENOTTY; + if (get_user(pgrp_nr, p)) + return -EFAULT; + if (pgrp_nr < 0) + return -EINVAL; + rcu_read_lock(); + pgrp = find_vpid(pgrp_nr); + retval = -ESRCH; + if (!pgrp) + goto out_unlock; + retval = -EPERM; + if (session_of_pgrp(pgrp) != task_session(current)) + goto out_unlock; + retval = 0; + spin_lock_irq(&tty->ctrl_lock); + put_pid(real_tty->pgrp); + real_tty->pgrp = get_pid(pgrp); + spin_unlock_irq(&tty->ctrl_lock); +out_unlock: + rcu_read_unlock(); + return retval; +} + +/** + * tiocgsid - get session id + * @tty: tty passed by user + * @real_tty: tty side of the tty passed by the user if a pty else the tty + * @p: pointer to returned session id + * + * Obtain the session id of the tty. If there is no session + * return an error. + * + * Locking: none. Reference to current->signal->tty is safe. + */ +static int tiocgsid(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p) +{ + /* + * (tty == real_tty) is a cheap way of + * testing if the tty is NOT a master pty. + */ + if (tty == real_tty && current->signal->tty != real_tty) + return -ENOTTY; + if (!real_tty->session) + return -ENOTTY; + return put_user(pid_vnr(real_tty->session), p); +} + +/* + * Called from tty_ioctl(). If tty is a pty then real_tty is the slave side, + * if not then tty == real_tty. + */ +long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty, + struct file *file, unsigned int cmd, unsigned long arg) +{ + void __user *p = (void __user *)arg; + + switch (cmd) { + case TIOCNOTTY: + if (current->signal->tty != tty) + return -ENOTTY; + no_tty(); + return 0; + case TIOCSCTTY: + return tiocsctty(real_tty, file, arg); + case TIOCGPGRP: + return tiocgpgrp(tty, real_tty, p); + case TIOCSPGRP: + return tiocspgrp(tty, real_tty, p); + case TIOCGSID: + return tiocgsid(tty, real_tty, p); + } + return -ENOIOCTLCMD; +} diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 36e1b8c7680f..accbd1257bc4 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -80,21 +80,17 @@ void clear_selection(void) /* * User settable table: what characters are to be considered alphabetic? - * 256 bits. Locked by the console lock. + * 128 bits. Locked by the console lock. */ -static u32 inwordLut[8]={ +static u32 inwordLut[]={ 0x00000000, /* control chars */ - 0x03FF0000, /* digits */ + 0x03FFE000, /* digits and "-./" */ 0x87FFFFFE, /* uppercase and '_' */ 0x07FFFFFE, /* lowercase */ - 0x00000000, - 0x00000000, - 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */ - 0xFF7FFFFF /* latin-1 accented letters, not division sign */ }; static inline int inword(const u16 c) { - return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); + return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); } /** @@ -106,10 +102,10 @@ static inline int inword(const u16 c) { */ int sel_loadlut(char __user *p) { - u32 tmplut[8]; - if (copy_from_user(tmplut, (u32 __user *)(p+4), 32)) + u32 tmplut[ARRAY_SIZE(inwordLut)]; + if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut))) return -EFAULT; - memcpy(inwordLut, tmplut, 32); + memcpy(inwordLut, tmplut, sizeof(inwordLut)); return 0; } diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 5c4933bb4b53..9c9945284bcf 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -181,7 +181,7 @@ int console_blanked; static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */ static int vesa_off_interval; -static int blankinterval = 10*60; +static int blankinterval; core_param(consoleblank, blankinterval, int, 0444); static DECLARE_WORK(console_work, console_callback); |
