From patchwork Sat Sep 3 16:38:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12965014 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 8A4A7ECAAD4 for ; Sat, 3 Sep 2022 16:38:51 +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=AumpImu/YLBg/D02TXaS4zDH251qRrKIImwwlu8f1wo=; b=Rv/d+u1Gfeweqz p+mT0iLW8PrU5vhyvMwlls7+8HYur56MGh4unG+Ppz4atwyteGwdhCCKR1vXy5zj7WaNIGs3Ifcce VSod9NlCryMZSBdulTGBt8Hl8kuMeSzA1LR+b8PDeFVBzXit/y3Kuhrp+AUp5L9gl/8VrzI8hsimj T9PwDF3vWs/F5pAMjRsl5iDXhkPa1FAB1IZX7+Fomi5a30uQVuJ3srN1H33MzYvxlfLeZCSbxe6kY a5WkuNtRUqK1TohlJG4+lQ/+l39/bKYHaUllYYPFKy6smJoWFxinNxMNCTmxngI3E9HyAqKjdAnIi t7Kpp7wFcZJpIcfnjmag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oUWAK-00DjsY-TU; Sat, 03 Sep 2022 16:38:40 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oUWAH-00DjqB-MO for linux-riscv@lists.infradead.org; Sat, 03 Sep 2022 16:38:38 +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 dfw.source.kernel.org (Postfix) with ESMTPS id 3363460A47; Sat, 3 Sep 2022 16:38:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71876C433D7; Sat, 3 Sep 2022 16:38:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1662223113; bh=kkU88ruHZB/3z5MRfFsNgiX+HAQDk+V3gAcd/JsO0+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V8XnIC0r0bcarId5VzdVbkRlr7RFqTBlvRUb9R09OAvUMk1XTmuCvbHwLTOuS+3oF rs9SeRyzFpg3OCeFLZX2mZaVLrdc/Ru/apJanGXXUMlpIDMxNj0ZPQqXelszDS3525 Kh1tYFpmuVZImtQlWHFwyGKggSKQajtbX8YXCTBMxHkyiIxIktzMqhutTv8ivWQP9U 4spvQz+be7CzBZ2dZg/fm2YZrgnY2tNSyPAtWJ7tEtRYNYibmI4KbvFEMvU/Y1yNil 7WGMpVn3h1EBFdzrkU3B8jrK2QB2I0vtvvhUYCLlbCoUNZx5ACYwSFk0qAeOh8d0EE vUleH5KCQK3Dg== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH 3/3] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK Date: Sat, 3 Sep 2022 12:38:08 -0400 Message-Id: <20220903163808.1954131-4-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220903163808.1954131-1-guoren@kernel.org> References: <20220903163808.1954131-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220903_093837_793518_0798A043 X-CRM114-Status: GOOD ( 12.22 ) 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 Reported-by: kernel test robot --- arch/riscv/Kconfig | 7 ++++--- arch/riscv/kernel/irq.c | 15 +++++++++++++++ 2 files changed, 19 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 eec5c38100b6..282acfee7304 100644 --- a/arch/riscv/kernel/irq.c +++ b/arch/riscv/kernel/irq.c @@ -38,6 +38,21 @@ 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 */