From patchwork Mon Jan 16 13:50:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 13103223 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 63965C54EBE for ; Mon, 16 Jan 2023 13:51:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231570AbjAPNvA (ORCPT ); Mon, 16 Jan 2023 08:51:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231540AbjAPNup (ORCPT ); Mon, 16 Jan 2023 08:50:45 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F51D2197D; Mon, 16 Jan 2023 05:50:43 -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 07588B80F02; Mon, 16 Jan 2023 13:50:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F863C433F0; Mon, 16 Jan 2023 13:50:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673877040; bh=WEDOJyVivaqZHP8mDzZn1TPqLohEFKgOiUS27FM0USs=; h=From:To:Cc:Subject:Date:From; b=XaAh4QOUuZU9HHz/bKg792uJ2CncCl7t1R7gY2Q5l256Q//MOsuZRWVyPofv03ow1 Hoh4QKTRVrIeGiC75IUbOnpT8zFxP/FiJx+1BeeDrSbXQ+EJJXrOKwsh4kBi+RLA8e V97XeDPe06j9AsslBLEWK9x4jvQx2D9E9t6y4FgVZ1orGnxP8WsLhNnZn6wE1ru7Ix kXpcbjOrTCjMmWA8RHtPy1G0rJzhaxZfMMzPzTqyU/tZ0Y74w+3LBbVWUKmbx+NNkn 9GDe0VIXSInL31BVma2GrXpIGoYmVM8cnqYwXpOgnKnp9pXlO1V3E0llE4BB1sHatW bAHNhGLOFhlUQ== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pHPt4-0003ui-PH; Mon, 16 Jan 2023 14:50:59 +0100 From: Johan Hovold To: Marc Zyngier , Thomas Gleixner Cc: x86@kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH v4 00/19] irqdomain: fix mapping race and clean up locking Date: Mon, 16 Jan 2023 14:50:25 +0100 Message-Id: <20230116135044.14998-1-johan+linaro@kernel.org> X-Mailer: git-send-email 2.38.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Parallel probing (e.g. due to asynchronous probing) of devices that share interrupts can currently result in two mappings for the same hardware interrupt to be created. This series fixes this mapping race and clean up the irqdomain locking so that in the end the global irq_domain_mutex is only used for managing the likewise global irq_domain_list, while domain operations (e.g. IRQ allocations) use per-domain (hierarchy) locking. Johan Changes in v4 - add a comment to __irq_domain_add() as further documentation of the domain lock and root pointer (19/19) - add a comment documenting that the lockdep assertion in irq_domain_set_mapping() also verifies that the domains in a hierarchy point to the same root (19/19) Changes in v3 - drop dead and bogus code (1--3/19, new) - fix racy mapcount accesses (5/19, new) - drop revmap mutex (6/19, new) - use irq_domain_mutex to address mapping race (9/19) - clean up irq_domain_push/pop_irq() (10/19, new) - use irq_domain_create_hierarchy() to construct hierarchies (11--18/19, new) - switch to per-domain locking (19/19, new) Changes in v2 - split out redundant-lookup cleanup (1/4) - use a per-domain mutex to address mapping race (2/4) - move kernel-doc to exported function (2/4) - fix association race (3/4, new) - use per-domain mutex for associations (4/4, new) Johan Hovold (19): irqdomain: Drop bogus fwspec-mapping error handling irqdomain: Drop dead domain-name assignment irqdomain: Drop leftover brackets irqdomain: Fix association race irqdomain: Fix disassociation race irqdomain: Drop revmap mutex irqdomain: Look for existing mapping only once irqdomain: Refactor __irq_domain_alloc_irqs() irqdomain: Fix mapping-creation race irqdomain: Clean up irq_domain_push/pop_irq() x86/ioapic: Use irq_domain_create_hierarchy() x86/apic: Use irq_domain_create_hierarchy() irqchip/alpine-msi: Use irq_domain_add_hierarchy() irqchip/gic-v2m: Use irq_domain_create_hierarchy() irqchip/gic-v3-its: Use irq_domain_create_hierarchy() irqchip/gic-v3-mbi: Use irq_domain_create_hierarchy() irqchip/loongson-pch-msi: Use irq_domain_create_hierarchy() irqchip/mvebu-odmi: Use irq_domain_create_hierarchy() irqdomain: Switch to per-domain locking arch/x86/kernel/apic/io_apic.c | 8 +- arch/x86/platform/uv/uv_irq.c | 7 +- drivers/irqchip/irq-alpine-msi.c | 8 +- drivers/irqchip/irq-gic-v2m.c | 5 +- drivers/irqchip/irq-gic-v3-its.c | 13 +- drivers/irqchip/irq-gic-v3-mbi.c | 5 +- drivers/irqchip/irq-loongson-pch-msi.c | 9 +- drivers/irqchip/irq-mvebu-odmi.c | 13 +- include/linux/irqdomain.h | 6 +- kernel/irq/irqdomain.c | 341 ++++++++++++++----------- 10 files changed, 233 insertions(+), 182 deletions(-)