From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28DC6C433EF for ; Thu, 21 Oct 2021 18:03:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09FD661994 for ; Thu, 21 Oct 2021 18:03:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232440AbhJUSF0 (ORCPT ); Thu, 21 Oct 2021 14:05:26 -0400 Received: from foss.arm.com ([217.140.110.172]:45950 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232481AbhJUSFU (ORCPT ); Thu, 21 Oct 2021 14:05:20 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 11C74147A; Thu, 21 Oct 2021 11:03:04 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 34BDF3F70D; Thu, 21 Oct 2021 11:03:01 -0700 (PDT) From: Mark Rutland To: linux-kernel@vger.kernel.org Cc: aou@eecs.berkeley.edu, catalin.marinas@arm.com, deanbo422@gmail.com, green.hu@gmail.com, guoren@kernel.org, jonas@southpole.se, kernelfans@gmail.com, linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk, mark.rutland@arm.com, maz@kernel.org, nickhu@andestech.com, palmer@dabbelt.com, paulmck@kernel.org, paul.walmsley@sifive.com, peterz@infradead.org, shorne@gmail.com, stefan.kristiansson@saunalahti.fi, tglx@linutronix.de, torvalds@linux-foundation.org, tsbogend@alpha.franken.de, vgupta@kernel.org, will@kernel.org Subject: [PATCH 05/15] irq: add generic_handle_arch_irq() Date: Thu, 21 Oct 2021 19:02:26 +0100 Message-Id: <20211021180236.37428-6-mark.rutland@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20211021180236.37428-1-mark.rutland@arm.com> References: <20211021180236.37428-1-mark.rutland@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Several architectures select GENERIC_IRQ_MULTI_HANDLER and branch to handle_arch_irq() without performing any entry accounting. Add a generic wrapper to handle the commoon irqentry work when invoking handle_arch_irq(). Where an architecture needs to perform some entry accounting itself, it will need to invoke handle_arch_irq() itself. In subsequent patches it will become the responsibilty of the entry code to set the irq regs when entering an IRQ (rather than deferring this to an irqchip handler), so generic_handle_arch_irq() is made to set the irq regs now. This can be redundant in some cases, but is never harmful as saving/restoring the old regs nests safely. Signed-off-by: Mark Rutland Cc: Marc Zyngier Cc: Thomas Gleixner --- kernel/irq/handle.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 221d80c31e94..27182003b879 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -14,6 +14,8 @@ #include #include +#include + #include #include "internals.h" @@ -226,4 +228,20 @@ int __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) handle_arch_irq = handle_irq; return 0; } + +/** + * generic_handle_arch_irq - root irq handler for architectures which do no + * entry accounting themselves + * @regs: Register file coming from the low-level handling code + */ +asmlinkage void noinstr generic_handle_arch_irq(struct pt_regs *regs) +{ + struct pt_regs *old_regs; + + irq_enter(); + old_regs = set_irq_regs(regs); + handle_arch_irq(regs); + set_irq_regs(old_regs); + irq_exit(); +} #endif -- 2.11.0