From nobody Fri Sep 19 03:51:02 2025 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 AFEDEC433FE for ; Wed, 30 Nov 2022 03:44:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233149AbiK3DoC (ORCPT ); Tue, 29 Nov 2022 22:44:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233147AbiK3Dnj (ORCPT ); Tue, 29 Nov 2022 22:43:39 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 597D674ABD; Tue, 29 Nov 2022 19:43:02 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id DA4D5B80B57; Wed, 30 Nov 2022 03:43:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FC79C433D7; Wed, 30 Nov 2022 03:42:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669779779; bh=LkmHPwyg5AHgsnlnySZigQWgA50amndJsxUL70mm6Oc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j30TQDDrhpuHNiOp7vSJZapkItKWEkMy4nD1ayO6InfFSwiubyjcvBhjO7iX/bXC7 vwdbZT8DEnxZRM5FK0YEVrA7AuQSLAv5sDCTl627jgbmoJilplqp+ee7scQRfJAsTQ MzNxPjMPhPMCTC22dQHJ+5o8c9YeTss2Ns7DuOwvK50Naz1GFECszcmRvwymMaxob9 JTGrYLwNEbPOC3BMpqXU0kgaiFbGmsrwc8hwpBrhsxCh8RO0qd04hbTI4vi10Ivm7t 1xMbWouFbGyPZOZqS1uMn+Nuu2O2xlPoTQw4RvUoHPtRQ1binklq6XPz/YbxSfYjfK qyb261txv3UnQ== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, lazyparser@gmail.com, falcon@tinylab.org, chenhuacai@kernel.org, apatel@ventanamicro.com, atishp@atishpatra.org, palmer@dabbelt.com, paul.walmsley@sifive.com, mark.rutland@arm.com, zouyipeng@huawei.com, bigeasy@linutronix.de, David.Laight@aculab.com, chenzhongjin@huawei.com, greentime.hu@sifive.com, andy.chiu@sifive.com, ben@decadent.org.uk Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH -next V9 08/14] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK Date: Tue, 29 Nov 2022 22:40:53 -0500 Message-Id: <20221130034059.826599-9-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221130034059.826599-1-guoren@kernel.org> References: <20221130034059.826599-1-guoren@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Guo Ren Add the HAVE_SOFTIRQ_ON_OWN_STACK feature for the IRQ_STACKS config. The irq and softirq use the same independent irq_stack of percpu by time division multiplexing. Tested-by: Jisheng Zhang Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 7 ++++--- arch/riscv/kernel/irq.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+), 3 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 2653a381cc62..85241415a935 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -446,12 +446,13 @@ config FPU If you don't know what to do here, say Y. =20 config IRQ_STACKS - bool "Independent irq stacks" if EXPERT + bool "Independent irq & softirq stacks" if EXPERT default y select HAVE_IRQ_EXIT_ON_IRQ_STACK + select HAVE_SOFTIRQ_ON_OWN_STACK help - Add independent irq stacks for percpu to prevent kernel stack overflows. - We may save some memory footprint by disabling IRQ_STACKS. + Add independent irq & softirq stacks for percpu to prevent kernel stack + overflows. We may save some memory footprint by disabling IRQ_STACKS. =20 endmenu # "Platform type" =20 diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c index 5d77f692b198..a6406da34937 100644 --- a/arch/riscv/kernel/irq.c +++ b/arch/riscv/kernel/irq.c @@ -11,6 +11,7 @@ #include #include #include +#include =20 #ifdef CONFIG_IRQ_STACKS static DEFINE_PER_CPU(ulong *, irq_stack_ptr); @@ -38,6 +39,38 @@ static void init_irq_stacks(void) per_cpu(irq_stack_ptr, cpu) =3D per_cpu(irq_stack, cpu); } #endif /* CONFIG_VMAP_STACK */ + +#ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK +void do_softirq_own_stack(void) +{ +#ifdef CONFIG_IRQ_STACKS + if (on_thread_stack()) { + ulong *sp =3D per_cpu(irq_stack_ptr, smp_processor_id()) + + IRQ_STACK_SIZE/sizeof(ulong); + __asm__ __volatile( + "addi sp, sp, -"RISCV_SZPTR "\n" + REG_S" ra, (sp) \n" + "addi sp, sp, -"RISCV_SZPTR "\n" + REG_S" s0, (sp) \n" + "addi s0, sp, 2*"RISCV_SZPTR "\n" + "move sp, %[sp] \n" + "call __do_softirq \n" + "addi sp, s0, -2*"RISCV_SZPTR"\n" + REG_L" s0, (sp) \n" + "addi sp, sp, "RISCV_SZPTR "\n" + REG_L" ra, (sp) \n" + "addi sp, sp, "RISCV_SZPTR "\n" + : + : [sp] "r" (sp) + : "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", + "t0", "t1", "t2", "t3", "t4", "t5", "t6", + "memory"); + } else +#endif + __do_softirq(); +} +#endif /* CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK */ + #else static void init_irq_stacks(void) {} #endif /* CONFIG_IRQ_STACKS */ --=20 2.36.1