From patchwork Tue Jun 7 16:01:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9161793 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 EFFE360467 for ; Tue, 7 Jun 2016 16:04:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E14B52723E for ; Tue, 7 Jun 2016 16:04:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D5E3F28179; Tue, 7 Jun 2016 16:04:42 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9AE862723E for ; Tue, 7 Jun 2016 16:04:42 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bAJTB-0007mD-CN; Tue, 07 Jun 2016 16:03:09 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1bAJSI-000612-P4 for linux-arm-kernel@lists.infradead.org; Tue, 07 Jun 2016 16:02:15 +0000 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (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 DE98C63141; Tue, 7 Jun 2016 16:01:54 +0000 (UTC) Received: from localhost.redhat.com (vpn1-5-152.ams2.redhat.com [10.36.5.152]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u57G1SMD009908; Tue, 7 Jun 2016 12:01:50 -0400 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v10 5/9] genirq/msi-doorbell: msi_doorbell_safe Date: Tue, 7 Jun 2016 16:01:24 +0000 Message-Id: <1465315288-5931-6-git-send-email-eric.auger@redhat.com> In-Reply-To: <1465315288-5931-1-git-send-email-eric.auger@redhat.com> References: <1465315288-5931-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 07 Jun 2016 16:01:55 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160607_090215_025377_AE19F40E X-CRM114-Status: GOOD ( 12.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: julien.grall@arm.com, Jean-Philippe.Brucker@arm.com, p.fedin@samsung.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, yehuday@marvell.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP msi_doorbell_safe returns whether all the registered doorbells implement irq_remapping. When assigning a PCIe device whose host controller is upstream to an IOMMU, we currently do not know whether the MSI controller is upstream or downstream to the IOMMU. Signed-off-by: Eric Auger --- include/linux/msi-doorbell.h | 12 ++++++++++++ kernel/irq/msi-doorbell.c | 14 ++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/msi-doorbell.h b/include/linux/msi-doorbell.h index abdaaa0..648f239 100644 --- a/include/linux/msi-doorbell.h +++ b/include/linux/msi-doorbell.h @@ -65,6 +65,13 @@ msi_doorbell_lookup(void *chip_data); */ int msi_doorbell_pages(unsigned int order); +/** + * msi_doorbell_safe: return whether all registered doorbells + * do implement irq_remapping and are safe to assign (coarse safety + * assessment) + */ +bool msi_doorbell_safe(void); + #else static inline int @@ -88,6 +95,11 @@ msi_doorbell_pages(unsigned int order) return 0; } +static inline bool +msi_doorbell_safe(void) +{ + return true; +} #endif /* CONFIG_MSI_DOORBELL */ #endif diff --git a/kernel/irq/msi-doorbell.c b/kernel/irq/msi-doorbell.c index 65ca9292..69121c8 100644 --- a/kernel/irq/msi-doorbell.c +++ b/kernel/irq/msi-doorbell.c @@ -132,3 +132,17 @@ int msi_doorbell_pages(unsigned int order) } EXPORT_SYMBOL_GPL(msi_doorbell_pages); +bool msi_doorbell_safe(void) +{ + struct irqchip_doorbell *db; + bool irq_remapping = true; + + mutex_lock(&irqchip_doorbell_mutex); + list_for_each_entry(db, &irqchip_doorbell_list, next) { + irq_remapping &= db->info.irq_remapping; + } + mutex_unlock(&irqchip_doorbell_mutex); + + return irq_remapping; +} +EXPORT_SYMBOL_GPL(msi_doorbell_safe);