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 X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98090C6778A for ; Tue, 24 Jul 2018 11:07:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 54AD3205F4 for ; Tue, 24 Jul 2018 11:07:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 54AD3205F4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388707AbeGXMNR (ORCPT ); Tue, 24 Jul 2018 08:13:17 -0400 Received: from foss.arm.com ([217.140.101.70]:48492 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388585AbeGXMNQ (ORCPT ); Tue, 24 Jul 2018 08:13:16 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7F0E215B2; Tue, 24 Jul 2018 04:07:21 -0700 (PDT) Received: from e112298-lin.Emea.Arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 217963F237; Tue, 24 Jul 2018 04:07:19 -0700 (PDT) From: Julien Thierry To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, marc.zyngier@arm.com, ricardo.neri-calderon@linux.intel.com, mingo@kernel.org, Julien Thierry Subject: [PATCH 3/4] genirq: Provide NMI handlers Date: Tue, 24 Jul 2018 12:07:06 +0100 Message-Id: <1532430427-57151-4-git-send-email-julien.thierry@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1532430427-57151-1-git-send-email-julien.thierry@arm.com> References: <1532430427-57151-1-git-send-email-julien.thierry@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide flow handlers that are NMI safe for interrupts and percpu_devid interrupts. Signed-off-by: Julien Thierry Cc: Thomas Gleixner Cc: Marc Zyngier Cc: Peter Zijlstra --- include/linux/irq.h | 3 +++ kernel/irq/chip.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 0d71f63..88cbad3 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -600,6 +600,9 @@ static inline int irq_set_parent(int irq, int parent_irq) extern void handle_bad_irq(struct irq_desc *desc); extern void handle_nested_irq(unsigned int irq); +extern void handle_fasteoi_nmi(struct irq_desc *desc); +extern void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc); + extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); extern int irq_chip_pm_get(struct irq_data *data); extern int irq_chip_pm_put(struct irq_data *data); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index a2b3d9d..c332c17 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -730,6 +730,37 @@ void handle_fasteoi_irq(struct irq_desc *desc) EXPORT_SYMBOL_GPL(handle_fasteoi_irq); /** + * handle_fasteoi_nmi - irq handler for NMI interrupt lines + * @desc: the interrupt description structure for this irq + * + * A simple NMI-safe handler, considering the restrictions + * from request_nmi. + * + * Only a single callback will be issued to the chip: an ->eoi() + * call when the interrupt has been serviced. This enables support + * for modern forms of interrupt handlers, which handle the flow + * details in hardware, transparently. + */ +void handle_fasteoi_nmi(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irqaction *action = desc->action; + unsigned int irq = irq_desc_get_irq(desc); + irqreturn_t res; + + trace_irq_handler_entry(irq, action); + /* + * NMIs cannot be shared, there is only one action. + */ + res = action->handler(irq, action->dev_id); + trace_irq_handler_exit(irq, action, res); + + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); +} +EXPORT_SYMBOL_GPL(handle_fasteoi_nmi); + +/** * handle_edge_irq - edge type IRQ handler * @desc: the interrupt description structure for this irq * @@ -908,6 +939,29 @@ void handle_percpu_devid_irq(struct irq_desc *desc) chip->irq_eoi(&desc->irq_data); } +/** + * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu + * dev ids + * @desc: the interrupt description structure for this irq + * + * Similar to handle_fasteoi_nmi, but handling the dev_id cookie + * as a percpu pointer. + */ +void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irqaction *action = desc->action; + unsigned int irq = irq_desc_get_irq(desc); + irqreturn_t res; + + trace_irq_handler_entry(irq, action); + res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id)); + trace_irq_handler_exit(irq, action, res); + + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); +} + static void __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle, int is_chained, const char *name) -- 1.9.1