From patchwork Tue Aug 2 17:23:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9259393 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 DA1396077C for ; Tue, 2 Aug 2016 17:28:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C81A8283E0 for ; Tue, 2 Aug 2016 17:28:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BCA5328489; Tue, 2 Aug 2016 17:28:20 +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 49302283E0 for ; Tue, 2 Aug 2016 17:28:20 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bUdSR-0000cz-AQ; Tue, 02 Aug 2016 17:26:23 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bUdQk-0006OU-Um for linux-arm-kernel@lists.infradead.org; Tue, 02 Aug 2016 17:24:43 +0000 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (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 4264985367; Tue, 2 Aug 2016 17:24:18 +0000 (UTC) Received: from localhost.redhat.com (vpn1-7-179.ams2.redhat.com [10.36.7.179]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u72HNgIR017433; Tue, 2 Aug 2016 13:24:13 -0400 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 Subject: [PATCH v12 06/11] genirq/msi: msi_doorbell_safe Date: Tue, 2 Aug 2016 17:23:32 +0000 Message-Id: <1470158617-7022-7-git-send-email-eric.auger@redhat.com> In-Reply-To: <1470158617-7022-1-git-send-email-eric.auger@redhat.com> References: <1470158617-7022-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 02 Aug 2016 17:24:18 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160802_102439_428460_419C9D5B X-CRM114-Status: GOOD ( 10.99 ) 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: drjones@redhat.com, kvm@vger.kernel.org, Jean-Philippe.Brucker@arm.com, Manish.Jaggi@caviumnetworks.com, p.fedin@samsung.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, dennis.chen@arm.com, robert.richter@caviumnetworks.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. IRQ remapping is the x86 terminology (IRQ translation used on ARM). The MSI controller topology is safe if all the registered doorbells implement IRQ remapping. This safety notion is used on ARM when assigning PCIe devices. If any of the MSI doorbell is unsafe, the MSI assignment gets considered unsafe. Signed-off-by: Eric Auger --- v11 -> v12: - reword the commit message --- include/linux/msi-doorbell.h | 13 +++++++++++++ kernel/irq/msi-doorbell.c | 6 ++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/msi-doorbell.h b/include/linux/msi-doorbell.h index bbedb3b..696e0bd 100644 --- a/include/linux/msi-doorbell.h +++ b/include/linux/msi-doorbell.h @@ -47,6 +47,14 @@ void msi_doorbell_unregister_global(struct msi_doorbell_info *db); */ int msi_doorbell_calc_pages(unsigned int order); +/** + * msi_doorbell_safe - return whether all registered doorbells are safe + * + * Safe doorbells are those which implement irq remapping + * Return: true if all doorbells are safe, false otherwise + */ +bool msi_doorbell_safe(void); + #else static inline struct msi_doorbell_info * @@ -64,6 +72,11 @@ static inline int msi_doorbell_calc_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 5c6c2aa..f8f0d24 100644 --- a/kernel/irq/msi-doorbell.c +++ b/kernel/irq/msi-doorbell.c @@ -130,3 +130,9 @@ int msi_doorbell_calc_pages(unsigned int order) return ret; } EXPORT_SYMBOL_GPL(msi_doorbell_calc_pages); + +bool msi_doorbell_safe(void) +{ + return !nb_unsafe_doorbells; +} +EXPORT_SYMBOL_GPL(msi_doorbell_safe);