From patchwork Thu Sep 8 02:25:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12969586 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 34099ECAAD3 for ; Thu, 8 Sep 2022 02:26:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=uAQHj+gijAZrfpOMy2GesSlD1Nb6FPEtUAL1O1a3Jb4=; b=UVEhO2Lrt7KmRr oXn0WgQbhJ/J2t8cXae8onpY9NodN5dz2WgYc9/Mo84UffprbWkUEnBKDPSDViOTv6ePgDj0JWt1i r6OSmFY1SQqwxj4VZ25lniBM52wEXQyBq393ZthvKcsPhbsQgCDBwiT83py9xXvI9puIsqIPB1fsN R+YZ9Oe2e7sAZ42Ca08XUXXW8ZpATos9Nl0IJMIIB2cqAAvv1o7Pei72RF0IkWdSU9qMi3SeQ9SCb MbDfWwem36xvJyhnDUjPXFs38awdd1asfhrrOeK/rIJazO9TsgHqbZQSnRUFoeTRKZH7BmA5G4+aG KfFhzIVaGWutba6FqRiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oW7F6-00Efne-2X; Thu, 08 Sep 2022 02:26:12 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oW7F2-00Efj2-GA for linux-riscv@lists.infradead.org; Thu, 08 Sep 2022 02:26:10 +0000 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 2526BB81E73; Thu, 8 Sep 2022 02:26:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F49CC433B5; Thu, 8 Sep 2022 02:25:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1662603965; bh=zdFYpvuTPe6RpWrIfdMW7NpG1CnfQ2kCKBqmLquyd8U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EGQVKLycZAECil3TKQQyg5hLbOxso7Uejk4eo8lY0c8VF11SsIL+cktLFCL1eK7kP k1F+LyNad6YL6Roa8y82wl0wqkBc9bpl0zoedrSfU27UmLF743m1XiCtfhDlEinOuN QpYjfOAejd09RHdCShzk09AUmZt/rVMK9IH3RZucwzifT8aQ2aDnj3vjn8luFt4KUT Gkw1IUcueyqQp0crLHe0Iup7A6j2wXqpY6baS3709tphRDwCSY0cQvtXyAEk0cA3vz wu75IVj6WtBcdtO/LZSmyUz6pLFTdQSsO4e0GPnaBZn6cym8fugDekBEYtp7Bqw2Vf tQMdNd+mXG5YA== 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, bigeasy@linutronix.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH V4 7/8] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK Date: Wed, 7 Sep 2022 22:25:05 -0400 Message-Id: <20220908022506.1275799-8-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220908022506.1275799-1-guoren@kernel.org> References: <20220908022506.1275799-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220907_192608_720511_7B10981F X-CRM114-Status: GOOD ( 13.34 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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. Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 7 ++++--- arch/riscv/kernel/irq.c | 16 ++++++++++++++++ 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index a8a12b4ba1a9..da548ed7d107 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -434,12 +434,13 @@ config FPU If you don't know what to do here, say Y. config IRQ_STACKS - bool "Independent irq stacks" + bool "Independent irq & softirq stacks" 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. endmenu # "Platform type" diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c index 5ad4952203c5..c09cd4d28308 100644 --- a/arch/riscv/kernel/irq.c +++ b/arch/riscv/kernel/irq.c @@ -11,6 +11,7 @@ #include #include #include +#include #ifdef CONFIG_IRQ_STACKS static DEFINE_PER_CPU(ulong *, irq_stack_ptr); @@ -38,6 +39,21 @@ static void init_irq_stacks(void) per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu); } #endif /* CONFIG_VMAP_STACK */ + +#ifndef CONFIG_PREEMPT_RT +static void do_riscv_softirq(struct pt_regs *regs) +{ + __do_softirq(); +} + +void do_softirq_own_stack(void) +{ + ulong *sp = per_cpu(irq_stack_ptr, smp_processor_id()); + + call_on_stack(NULL, sp, do_riscv_softirq, 0); +} +#endif /* CONFIG_PREEMPT_RT */ + #else static void init_irq_stacks(void) {} #endif /* CONFIG_IRQ_STACKS */