From patchwork Thu Sep 14 18:38:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Ogness X-Patchwork-Id: 723002 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93566EEAA62 for ; Thu, 14 Sep 2023 18:43:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242109AbjINSnb (ORCPT ); Thu, 14 Sep 2023 14:43:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242020AbjINSla (ORCPT ); Thu, 14 Sep 2023 14:41:30 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17E992D6A; Thu, 14 Sep 2023 11:39:09 -0700 (PDT) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1694716747; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6rrbJT9gAkuxqhBetlwX4STkcn6NRVLcBqG1WOPdKag=; b=Hy4pmQwrWiTg/Sk0lCuQa1kxE8/nB3RMmlGgMlxSI4lXcb0kwyeuXW11S9xZyynbrGkP2i Kq157hQUg26F3mY45MSuS3gyTKwdGM+jOio00+H3bLYvmtG+KVEAuOsqaTaU9oloO/9SoT SCJYc97+M10VosKuPvrsTUISMdLr8tHwQWTBvEZhR+nJJvPgLsCK4EHWOXX4bn+cL3FGkL nkok45hZinNMFOON6+PzIsZ5/KAr0WUiF9nIVBoLFbxOj2oFhnvxc4lVAAkdIKq2fwUGgA DDd2T+3IkSyjLZAMwmLxpwZNWvytbf8ep+qgUcriMPH/X0jWRW9TgOeRHv2VXQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1694716747; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6rrbJT9gAkuxqhBetlwX4STkcn6NRVLcBqG1WOPdKag=; b=ufFE+TzqR1c1IghPpzdGrNrWlVOJW647t33n4zmoZiZkEaPOPWGTffgRmUipOkFmFsuWv2 iFh50QKCm7tCSWAw== To: Greg Kroah-Hartman Cc: Jiri Slaby , linux-serial@vger.kernel.org, Petr Mladek , Thomas Gleixner , linux-kernel@vger.kernel.org, Hammer Hsieh Subject: [PATCH tty v1 66/74] serial: sunplus-uart: Use port lock wrappers Date: Thu, 14 Sep 2023 20:44:23 +0206 Message-Id: <20230914183831.587273-67-john.ogness@linutronix.de> In-Reply-To: <20230914183831.587273-1-john.ogness@linutronix.de> References: <20230914183831.587273-1-john.ogness@linutronix.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Thomas Gleixner When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner --- drivers/tty/serial/sunplus-uart.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/tty/serial/sunplus-uart.c b/drivers/tty/serial/sunplus-uart.c index 3aacd5eb414c..4251f4e1ba99 100644 --- a/drivers/tty/serial/sunplus-uart.c +++ b/drivers/tty/serial/sunplus-uart.c @@ -184,7 +184,7 @@ static void sunplus_break_ctl(struct uart_port *port, int ctl) unsigned long flags; unsigned int lcr; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); lcr = readl(port->membase + SUP_UART_LCR); @@ -195,7 +195,7 @@ static void sunplus_break_ctl(struct uart_port *port, int ctl) writel(lcr, port->membase + SUP_UART_LCR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } static void transmit_chars(struct uart_port *port) @@ -277,7 +277,7 @@ static irqreturn_t sunplus_uart_irq(int irq, void *args) struct uart_port *port = args; unsigned int isc; - spin_lock(&port->lock); + uart_port_lock(port); isc = readl(port->membase + SUP_UART_ISC); @@ -287,7 +287,7 @@ static irqreturn_t sunplus_uart_irq(int irq, void *args) if (isc & SUP_UART_ISC_TX) transmit_chars(port); - spin_unlock(&port->lock); + uart_port_unlock(port); return IRQ_HANDLED; } @@ -302,14 +302,14 @@ static int sunplus_startup(struct uart_port *port) if (ret) return ret; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); /* isc define Bit[7:4] int setting, Bit[3:0] int status * isc register will clean Bit[3:0] int status after read * only do a write to Bit[7:4] int setting */ isc |= SUP_UART_ISC_RXM; writel(isc, port->membase + SUP_UART_ISC); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); return 0; } @@ -318,13 +318,13 @@ static void sunplus_shutdown(struct uart_port *port) { unsigned long flags; - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); /* isc define Bit[7:4] int setting, Bit[3:0] int status * isc register will clean Bit[3:0] int status after read * only do a write to Bit[7:4] int setting */ writel(0, port->membase + SUP_UART_ISC); /* disable all interrupt */ - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); free_irq(port->irq, port); } @@ -372,7 +372,7 @@ static void sunplus_set_termios(struct uart_port *port, lcr |= UART_LCR_EPAR; } - spin_lock_irqsave(&port->lock, flags); + uart_port_lock_irqsave(port, &flags); uart_update_timeout(port, termios->c_cflag, baud); @@ -407,7 +407,7 @@ static void sunplus_set_termios(struct uart_port *port, writel(div_l, port->membase + SUP_UART_DIV_L); writel(lcr, port->membase + SUP_UART_LCR); - spin_unlock_irqrestore(&port->lock, flags); + uart_port_unlock_irqrestore(port, flags); } static void sunplus_set_ldisc(struct uart_port *port, struct ktermios *termios) @@ -517,15 +517,15 @@ static void sunplus_console_write(struct console *co, if (sunplus_console_ports[co->index]->port.sysrq) locked = 0; else if (oops_in_progress) - locked = spin_trylock(&sunplus_console_ports[co->index]->port.lock); + locked = uart_port_trylock(&sunplus_console_ports[co->index]->port); else - spin_lock(&sunplus_console_ports[co->index]->port.lock); + uart_port_lock(&sunplus_console_ports[co->index]->port); uart_console_write(&sunplus_console_ports[co->index]->port, s, count, sunplus_uart_console_putchar); if (locked) - spin_unlock(&sunplus_console_ports[co->index]->port.lock); + uart_port_unlock(&sunplus_console_ports[co->index]->port); local_irq_restore(flags); }