From patchwork Wed Jan 11 09:41:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9509655 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DBD2B60231 for ; Wed, 11 Jan 2017 09:45:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D6DEB27031 for ; Wed, 11 Jan 2017 09:45:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C81952853C; Wed, 11 Jan 2017 09:45:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 76B0727031 for ; Wed, 11 Jan 2017 09:45:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757491AbdAKJnQ (ORCPT ); Wed, 11 Jan 2017 04:43:16 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56130 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754173AbdAKJnO (ORCPT ); Wed, 11 Jan 2017 04:43:14 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id EA03921722; Wed, 11 Jan 2017 09:43:14 +0000 (UTC) Received: from localhost.redhat.com (vpn1-6-103.ams2.redhat.com [10.36.6.103]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v0B9g385030385; Wed, 11 Jan 2017 04:43:10 -0500 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org Cc: kvm@vger.kernel.org, drjones@redhat.com, linux-kernel@vger.kernel.org, pranav.sawargaonkar@gmail.com, iommu@lists.linux-foundation.org, punit.agrawal@arm.com, diana.craciun@nxp.com, gpkulkarni@gmail.com, shankerd@codeaurora.org, bharat.bhushan@nxp.com, geethasowjanya.akula@gmail.com Subject: [PATCH v8 12/18] irqdomain: Add irq domain MSI and MSI_REMAP flags Date: Wed, 11 Jan 2017 09:41:48 +0000 Message-Id: <1484127714-3263-13-git-send-email-eric.auger@redhat.com> In-Reply-To: <1484127714-3263-1-git-send-email-eric.auger@redhat.com> References: <1484127714-3263-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 11 Jan 2017 09:43:15 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We introduce two new enum values for the irq domain flag: - IRQ_DOMAIN_FLAG_MSI indicates the irq domain corresponds to an MSI domain - IRQ_DOMAIN_FLAG_MSI_REMAP indicates the irq domain has MSI remapping capabilities. Those values will be useful to check all MSI irq domains have MSI remapping support when assessing the safety of IRQ assignment to a guest. irq_domain_hierarchical_is_msi_remap() allows to check if an irq domain or any parent implements MSI remapping. Signed-off-by: Eric Auger Reviewed-by: Marc Zyngier Reviewed-by: Tomasz Nowicki --- v7 -> v8: - remove h variable in irq_domain_hierarchical_is_msi_remap - add Marc's R-b v6: - add IRQ_DOMAIN_FLAG_MSI as suggested by Marc - add irq_domain_is_msi, irq_domain_is_msi_remap and irq_domain_hierarchical_is_msi_remap --- include/linux/irqdomain.h | 35 +++++++++++++++++++++++++++++++++++ kernel/irq/irqdomain.c | 14 ++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index ffb8460..bc2f571 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -183,6 +183,12 @@ enum { /* Irq domain is an IPI domain with single virq */ IRQ_DOMAIN_FLAG_IPI_SINGLE = (1 << 3), + /* Irq domain implements MSIs */ + IRQ_DOMAIN_FLAG_MSI = (1 << 4), + + /* Irq domain implements MSI remapping */ + IRQ_DOMAIN_FLAG_MSI_REMAP = (1 << 5), + /* * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved * for implementation specific purposes and ignored by the @@ -446,6 +452,19 @@ static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) { return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE; } + +static inline bool irq_domain_is_msi(struct irq_domain *domain) +{ + return domain->flags & IRQ_DOMAIN_FLAG_MSI; +} + +static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) +{ + return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP; +} + +extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain); + #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ static inline void irq_domain_activate_irq(struct irq_data *data) { } static inline void irq_domain_deactivate_irq(struct irq_data *data) { } @@ -477,6 +496,22 @@ static inline bool irq_domain_is_ipi_single(struct irq_domain *domain) { return false; } + +static inline bool irq_domain_is_msi(struct irq_domain *domain) +{ + return false; +} + +static inline bool irq_domain_is_msi_remap(struct irq_domain *domain) +{ + return false; +} + +static inline bool +irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain) +{ + return false; +} #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ #else /* CONFIG_IRQ_DOMAIN */ diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 8c0a0ae..876e131 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1392,6 +1392,20 @@ static void irq_domain_check_hierarchy(struct irq_domain *domain) if (domain->ops->alloc) domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY; } + +/** + * irq_domain_hierarchical_is_msi_remap - Check if the domain or any + * parent has MSI remapping support + * @domain: domain pointer + */ +bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain) +{ + for (; domain; domain = domain->parent) { + if (irq_domain_is_msi_remap(domain)) + return true; + } + return false; +} #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ /** * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain