From patchwork Tue Jul 19 13:02:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9237133 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 6BE286075D for ; Tue, 19 Jul 2016 13:03:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5E31326C2F for ; Tue, 19 Jul 2016 13:03:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5288126E81; Tue, 19 Jul 2016 13:03:39 +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=ham 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 41FFD26C2F for ; Tue, 19 Jul 2016 13:03:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753863AbcGSNDK (ORCPT ); Tue, 19 Jul 2016 09:03:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37445 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753381AbcGSNDH (ORCPT ); Tue, 19 Jul 2016 09:03:07 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (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 E4CAF7F08C; Tue, 19 Jul 2016 13:03:06 +0000 (UTC) Received: from localhost.redhat.com (vpn1-4-201.ams2.redhat.com [10.36.4.201]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u6JD2omR022501; Tue, 19 Jul 2016 09:03:01 -0400 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, marc.zyngier@arm.com, christoffer.dall@linaro.org, andre.przywara@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: drjones@redhat.com, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, pbonzini@redhat.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, pranav.sawargaonkar@gmail.com, p.fedin@samsung.com, iommu@lists.linux-foundation.org, Jean-Philippe.Brucker@arm.com, yehuday@marvell.com, Manish.Jaggi@caviumnetworks.com, robert.richter@caviumnetworks.com Subject: [PATCH v11 02/10] genirq/msi: msi_compose wrapper Date: Tue, 19 Jul 2016 13:02:39 +0000 Message-Id: <1468933367-23159-3-git-send-email-eric.auger@redhat.com> In-Reply-To: <1468933367-23159-1-git-send-email-eric.auger@redhat.com> References: <1468933367-23159-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Tue, 19 Jul 2016 13:03:07 +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 Currently the MSI message is composed by directly calling irq_chip_compose_msi_msg and erased by setting the memory to zero. On some platforms, we will need to complexify this composition to properly handle MSI emission through IOMMU. Also we will need to track when the MSI message is erased. We propose to introduce a common wrapper for actual composition and erasure, msi_compose. Signed-off-by: Eric Auger --- v4 -> v5: - just introduce the msi-compose wrapper without adding new functionalities v3 -> v4: - that code was formely in irq-gic-common.c "irqchip/gicv2m/v3-its-pci-msi: IOMMU map the MSI frame when needed" also the [un]mapping was done in irq_write_msi_msg; now done on compose v2 -> v3: - protect iova/addr manipulation with CONFIG_ARCH_DMA_ADDR_T_64BIT and CONFIG_PHYS_ADDR_T_64BIT - only expose gic_pci_msi_domain_write_msg in case CONFIG_IOMMU_API & CONFIG_PCI_MSI_IRQ_DOMAIN are set. - gic_set/unset_msi_addr duly become static --- kernel/irq/msi.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 9b0ba4a..72bf4d6 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -55,6 +55,19 @@ static inline void irq_chip_write_msi_msg(struct irq_data *data, data->chip->irq_write_msi_msg(data, msg); } +static int msi_compose(struct irq_data *irq_data, + struct msi_msg *msg, bool erase) +{ + int ret = 0; + + if (erase) + memset(msg, 0, sizeof(*msg)); + else + ret = irq_chip_compose_msi_msg(irq_data, msg); + + return ret; +} + /** * msi_domain_set_affinity - Generic affinity setter function for MSI domains * @irq_data: The irq data associated to the interrupt @@ -73,7 +86,7 @@ int msi_domain_set_affinity(struct irq_data *irq_data, ret = parent->chip->irq_set_affinity(parent, mask, force); if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { - BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); + BUG_ON(msi_compose(irq_data, &msg, false)); irq_chip_write_msi_msg(irq_data, &msg); } @@ -85,7 +98,7 @@ static void msi_domain_activate(struct irq_domain *domain, { struct msi_msg msg; - BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); + BUG_ON(msi_compose(irq_data, &msg, false)); irq_chip_write_msi_msg(irq_data, &msg); } @@ -94,7 +107,7 @@ static void msi_domain_deactivate(struct irq_domain *domain, { struct msi_msg msg; - memset(&msg, 0, sizeof(msg)); + msi_compose(irq_data, &msg, true); irq_chip_write_msi_msg(irq_data, &msg); }