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 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 CFB20C433F5 for ; Sun, 2 Oct 2022 01:26:32 +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=D7pj0idkla2yT/HCA1UCxipYoT9h6qpfXi3GT52yw3c=; b=IBld4DeCHGHLp1 UbpsJqckJsVPCRIdpVhOJjAJn/okGlIFG6zHf7dDoGiZPZoU7x/F2ocEaWi8LJTKATaClSv5LVq7j ItKqmGNcOGA2o87UbbjKUyzoVJH/+Sz8b42REYL2xqYxdfD+m0BigjcX7lPwAxhqAjRtmXvrGieZd sd/4YE4QhsD/wVwuFsOquXJUx06EEeXu7b8K69Ba9AotxS3IYGeRBYkMYHRohvuVxo/mLIEv5hEiH sevWIEOlcv0BiSbDWJB1WksUJ3o6EZnjkJk/e/jy1uUvwXxoyj4FS8sfM0lehR41zhlzMjToZYbQ3 Lt7fQdBHOWLmEF6F/pfA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oenkO-00Grob-Dj; Sun, 02 Oct 2022 01:26:24 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oenkK-00Gria-E3 for linux-riscv@lists.infradead.org; Sun, 02 Oct 2022 01:26:22 +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 sin.source.kernel.org (Postfix) with ESMTPS id 7A111CE097C; Sun, 2 Oct 2022 01:26:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F01EDC43141; Sun, 2 Oct 2022 01:26:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1664673972; bh=hl8s1JRkC/D72xusdUm2CiUomxUomzsejsqnvIf/elc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kRcDxcl9Th63BDdsYYBWzAnrkTw4Uul2wdFnp7ik/ZrXutz+Mdq8ZT+goDwP+rz4d qWQ7LmMvKbyURg9mv+bga7cQPquL6GVHvVF5bZuSohBiwNK7njZqX17Kawv5n3/pK/ kXBw1FKvm0xzBuTf1O9ISZp3Y3m9oxenJOUp+a7kmHMGXsxSdVpiOWeGPiBZKk2kVu 33ijgKZC0phmGtIzhA95IiXWgXI9znYAZUR1PTrcJsHnHmLIAHU+ib4Ft/Ede+a3dZ rjzUFSkzV1sRXmIQpZRMd7h3FL//eqz0i8bRHUMYm1chsKSwET+I8SVr0aPgDkpcy1 9ajy9Q3f/78xg== 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 Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH V6 08/11] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK Date: Sat, 1 Oct 2022 21:24:48 -0400 Message-Id: <20221002012451.2351127-9-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221002012451.2351127-1-guoren@kernel.org> References: <20221002012451.2351127-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221001_182620_871798_1FB66D0C X-CRM114-Status: GOOD ( 13.65 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 Cc: Sebastian Andrzej Siewior --- 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 75db47a983f2..dfe600f3526c 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" 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. endmenu # "Platform type" 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 #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) = 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 = 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 */ -- 2.36.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv