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 67B45C61DA4 for ; Thu, 9 Feb 2023 13:33:08 +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=BRol7OY9SJKT1i+/6fwiR0HiOD85YKXkkCmyQoU5GME=; b=pFyO/ag+oHRgNY 4LG5RUq2li/OoM1niYshdYYDkrmUeEzaubJXZNOzGg5PzhjAJDjg1erwKqco3jnAlBoQ6u1OhDP9T uclYCovwl15fVToPgxRmu2YB6nlPt9nIrZgehInqG7P1EN9HHePWd7TGAXOpKUaXHJpsYmP9uwkHo avvsV2DwMKzHW6Ia7PBXQ2PTHJYJlodr7i+L3LRbV1MbMkAKqLdsSbQ8191mvAcCdk6tEkPdS7Obd 4eVglx5HpWkn0lFcfSteoEIO2PoZjdD3+ABJJxC9mMEI5j7/zFT5uANl9jEOHznFfDBc1miKdmrPk x20Gh30pbG3skSlwYPmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pQ71y-001hDZ-Ar; Thu, 09 Feb 2023 13:32:06 +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 1pQ70g-001gQe-Gl for linux-arm-kernel@lists.infradead.org; Thu, 09 Feb 2023 13:30:50 +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 A7C9561AA9; Thu, 9 Feb 2023 13:30:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA2F4C43445; Thu, 9 Feb 2023 13:30:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675949442; bh=sXzV5Iaq24naECB8eaIVtLUk0+3eItKCLxiskY8fyFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vn3pVq4XnDvmnCBCEkblxubZpXRJ9z4jB3Xe3em9LxRpz9DAuH2buE0z6oRW1sfpa DfEbFxY2iUHNMW8mBBIAabzIWS0Ia/zPv15VwGlEeD10yMkrm8HVOlZechnk8oMkEa xu8ymYko/YXbtSdBlCJYU0ZsR9NjRNi3pO6apw0pPSjjNZjSsWcZLwsmzS5xrh1qpW B8Xab+iGcsPINYAK1F1K6VJ5a2VuVR8015Vf9E9lrm1iPPfnpXcGQ20jrRutoloqh0 JtN0Xpfl+MStmsit4SrvRRhht/CgJW0XxaSen0dUMe8D6s1ymuTOif9cOFF6YZDtNa 1I8jxK/JZaLfA== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pQ71G-0001Ko-ED; Thu, 09 Feb 2023 14:31:22 +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 , stable@vger.kernel.org, Hsin-Yi Wang , Mark-PK Tsai Subject: [PATCH v5 04/19] irqdomain: Look for existing mapping only once Date: Thu, 9 Feb 2023 14:23:08 +0100 Message-Id: <20230209132323.4599-5-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230209132323.4599-1-johan+linaro@kernel.org> References: <20230209132323.4599-1-johan+linaro@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230209_053046_721567_1506C6DB X-CRM114-Status: GOOD ( 17.63 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 b4326c364ae7..3d6a14efae62 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -682,6 +682,34 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) EXPORT_SYMBOL_GPL(irq_create_direct_mapping); #endif +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 @@ -694,14 +722,11 @@ 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; @@ -709,34 +734,15 @@ 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); @@ -841,7 +847,7 @@ 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; } -- 2.39.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel