serial: core: fix sysrq overhead regression
Commit8e20fc3917("serial_core: Move sysrq functions from header file") converted the inline sysrq helpers to exported functions which are now called for every received character, interrupt and break signal also on systems without CONFIG_MAGIC_SYSRQ_SERIAL instead of being optimised away by the compiler. Inlining these helpers again also avoids the function call overhead when CONFIG_MAGIC_SYSRQ_SERIAL is enabled (e.g. when the port is not used as a console). Fixes:8e20fc3917("serial_core: Move sysrq functions from header file") Cc: Dmitry Safonov <0x7f454c46@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org> Cc: stable <stable@vger.kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com> Link: https://lore.kernel.org/r/20200610152232.16925-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
Greg Kroah-Hartman
Родитель
10652a9e9f
Коммит
08d5470308
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@ -41,8 +41,6 @@ static struct lock_class_key port_lock_key;
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#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
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#define SYSRQ_TIMEOUT (HZ * 5)
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static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
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struct ktermios *old_termios);
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static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
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@ -3163,7 +3161,7 @@ static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);
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* Returns false if @ch is out of enabling sequence and should be
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* handled some other way, true if @ch was consumed.
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*/
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static bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
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bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
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{
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int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
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@ -3186,102 +3184,9 @@ static bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
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port->sysrq = 0;
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return true;
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}
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#else
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static inline bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
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{
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return false;
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}
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EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq);
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#endif
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int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
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return 0;
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if (!port->has_sysrq || !port->sysrq)
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return 0;
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if (ch && time_before(jiffies, port->sysrq)) {
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if (sysrq_mask()) {
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handle_sysrq(ch);
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port->sysrq = 0;
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return 1;
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}
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if (uart_try_toggle_sysrq(port, ch))
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return 1;
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}
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port->sysrq = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(uart_handle_sysrq_char);
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int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
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return 0;
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if (!port->has_sysrq || !port->sysrq)
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return 0;
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if (ch && time_before(jiffies, port->sysrq)) {
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if (sysrq_mask()) {
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port->sysrq_ch = ch;
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port->sysrq = 0;
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return 1;
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}
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if (uart_try_toggle_sysrq(port, ch))
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return 1;
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}
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port->sysrq = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char);
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void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
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{
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int sysrq_ch;
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if (!port->has_sysrq) {
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spin_unlock_irqrestore(&port->lock, irqflags);
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return;
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}
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sysrq_ch = port->sysrq_ch;
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port->sysrq_ch = 0;
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spin_unlock_irqrestore(&port->lock, irqflags);
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if (sysrq_ch)
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handle_sysrq(sysrq_ch);
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}
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EXPORT_SYMBOL_GPL(uart_unlock_and_check_sysrq);
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/*
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* We do the SysRQ and SAK checking like this...
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*/
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int uart_handle_break(struct uart_port *port)
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{
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struct uart_state *state = port->state;
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if (port->handle_break)
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port->handle_break(port);
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if (port->has_sysrq && uart_console(port)) {
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if (!port->sysrq) {
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port->sysrq = jiffies + SYSRQ_TIMEOUT;
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return 1;
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}
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port->sysrq = 0;
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}
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if (port->flags & UPF_SAK)
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do_SAK(state->port.tty);
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return 0;
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}
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EXPORT_SYMBOL_GPL(uart_handle_break);
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EXPORT_SYMBOL(uart_write_wakeup);
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EXPORT_SYMBOL(uart_register_driver);
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EXPORT_SYMBOL(uart_unregister_driver);
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@ -462,11 +462,104 @@ extern void uart_handle_cts_change(struct uart_port *uport,
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extern void uart_insert_char(struct uart_port *port, unsigned int status,
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unsigned int overrun, unsigned int ch, unsigned int flag);
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extern int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch);
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extern int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch);
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extern void uart_unlock_and_check_sysrq(struct uart_port *port,
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unsigned long irqflags);
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extern int uart_handle_break(struct uart_port *port);
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#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
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#define SYSRQ_TIMEOUT (HZ * 5)
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bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch);
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static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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if (!port->has_sysrq || !port->sysrq)
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return 0;
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if (ch && time_before(jiffies, port->sysrq)) {
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if (sysrq_mask()) {
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handle_sysrq(ch);
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port->sysrq = 0;
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return 1;
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}
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if (uart_try_toggle_sysrq(port, ch))
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return 1;
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}
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port->sysrq = 0;
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return 0;
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}
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static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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if (!port->has_sysrq || !port->sysrq)
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return 0;
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if (ch && time_before(jiffies, port->sysrq)) {
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if (sysrq_mask()) {
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port->sysrq_ch = ch;
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port->sysrq = 0;
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return 1;
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}
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if (uart_try_toggle_sysrq(port, ch))
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return 1;
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}
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port->sysrq = 0;
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return 0;
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}
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static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
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{
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int sysrq_ch;
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if (!port->has_sysrq) {
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spin_unlock_irqrestore(&port->lock, irqflags);
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return;
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}
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sysrq_ch = port->sysrq_ch;
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port->sysrq_ch = 0;
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spin_unlock_irqrestore(&port->lock, irqflags);
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if (sysrq_ch)
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handle_sysrq(sysrq_ch);
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}
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#else /* CONFIG_MAGIC_SYSRQ_SERIAL */
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static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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return 0;
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}
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static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
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{
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return 0;
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}
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static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
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{
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spin_unlock_irqrestore(&port->lock, irqflags);
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}
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#endif /* CONFIG_MAGIC_SYSRQ_SERIAL */
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/*
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* We do the SysRQ and SAK checking like this...
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*/
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static inline int uart_handle_break(struct uart_port *port)
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{
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struct uart_state *state = port->state;
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if (port->handle_break)
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port->handle_break(port);
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#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
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if (port->has_sysrq && uart_console(port)) {
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if (!port->sysrq) {
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port->sysrq = jiffies + SYSRQ_TIMEOUT;
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return 1;
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}
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port->sysrq = 0;
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}
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#endif
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if (port->flags & UPF_SAK)
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do_SAK(state->port.tty);
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return 0;
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}
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/*
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* UART_ENABLE_MS - determine if port should enable modem status irqs
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