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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBC61C7618A for ; Wed, 15 Mar 2023 12:21:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232053AbjCOMV2 (ORCPT ); Wed, 15 Mar 2023 08:21:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232064AbjCOMVA (ORCPT ); Wed, 15 Mar 2023 08:21:00 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2910224BE6 for ; Wed, 15 Mar 2023 05:20:26 -0700 (PDT) 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 B2A2ECE1986 for ; Wed, 15 Mar 2023 12:20:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9490C433D2; Wed, 15 Mar 2023 12:20:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678882822; bh=Z988REYkg8SerAdj278z5rsfPVWrHg/WSV0fDC2WsyY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XxcqmxMlu2YvVkwTa9g+kPRXxHehXMYA8QtXT5s6qCdXyViyMArbOfNgdfgTBVixD tKBWc9Hs2gZ84iAkcE2d3b9SpLrhhHPqA4MhSNP0arlTglCyzBQyT2gcBbkenmsZpm LopoLP5gDTGrMlC9/VXpNH3VKowOYPqG4D/T/PZ8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hsin-Yi Wang , Mark-PK Tsai , Johan Hovold , Marc Zyngier , Sasha Levin Subject: [PATCH 5.10 015/104] irqdomain: Look for existing mapping only once Date: Wed, 15 Mar 2023 13:11:46 +0100 Message-Id: <20230315115732.683738321@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230315115731.942692602@linuxfoundation.org> References: <20230315115731.942692602@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold [ Upstream commit 6e6f75c9c98d2d246d90411ff2b6f0cd271f4cba ] Avoid looking for an existing mapping twice when creating a new mapping using irq_create_fwspec_mapping() by factoring out the actual allocation which is shared with irq_create_mapping_affinity(). The new helper function will also be used to fix a shared-interrupt mapping race, hence the Fixes tag. Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings") Cc: stable@vger.kernel.org # 4.8 Tested-by: Hsin-Yi Wang Tested-by: Mark-PK Tsai Signed-off-by: Johan Hovold Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230213104302.17307-5-johan+linaro@kernel.org Signed-off-by: Sasha Levin --- kernel/irq/irqdomain.c | 60 +++++++++++++++++++++++------------------- 1 file changed, 33 insertions(+), 27 deletions(-) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index fe07888a7d96a..d18c25a41673f 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -637,6 +637,34 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) } EXPORT_SYMBOL_GPL(irq_create_direct_mapping); +static unsigned int __irq_create_mapping_affinity(struct irq_domain *domain, + irq_hw_number_t hwirq, + const struct irq_affinity_desc *affinity) +{ + struct device_node *of_node = irq_domain_get_of_node(domain); + int virq; + + pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); + + /* Allocate a virtual interrupt number */ + virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), + affinity); + if (virq <= 0) { + pr_debug("-> virq allocation failed\n"); + return 0; + } + + if (irq_domain_associate(domain, virq, hwirq)) { + irq_free_desc(virq); + return 0; + } + + pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", + hwirq, of_node_full_name(of_node), virq); + + return virq; +} + /** * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space * @domain: domain owning this hardware interrupt or NULL for default domain @@ -649,14 +677,11 @@ EXPORT_SYMBOL_GPL(irq_create_direct_mapping); * on the number returned from that call. */ unsigned int irq_create_mapping_affinity(struct irq_domain *domain, - irq_hw_number_t hwirq, - const struct irq_affinity_desc *affinity) + irq_hw_number_t hwirq, + const struct irq_affinity_desc *affinity) { - struct device_node *of_node; int virq; - pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); - /* Look for default domain if necessary */ if (domain == NULL) domain = irq_default_domain; @@ -664,34 +689,15 @@ unsigned int irq_create_mapping_affinity(struct irq_domain *domain, WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq); return 0; } - pr_debug("-> using domain @%p\n", domain); - - of_node = irq_domain_get_of_node(domain); /* Check if mapping already exists */ virq = irq_find_mapping(domain, hwirq); if (virq) { - pr_debug("-> existing mapping on virq %d\n", virq); + pr_debug("existing mapping on virq %d\n", virq); return virq; } - /* Allocate a virtual interrupt number */ - virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), - affinity); - if (virq <= 0) { - pr_debug("-> virq allocation failed\n"); - return 0; - } - - if (irq_domain_associate(domain, virq, hwirq)) { - irq_free_desc(virq); - return 0; - } - - pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", - hwirq, of_node_full_name(of_node), virq); - - return virq; + return __irq_create_mapping_affinity(domain, hwirq, affinity); } EXPORT_SYMBOL_GPL(irq_create_mapping_affinity); @@ -831,7 +837,7 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec) return 0; } else { /* Create mapping */ - virq = irq_create_mapping(domain, hwirq); + virq = __irq_create_mapping_affinity(domain, hwirq, NULL); if (!virq) return virq; } -- 2.39.2