From patchwork Tue Jun 7 16:01:21 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9161773 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 37A4260467 for ; Tue, 7 Jun 2016 16:04:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 292C226E1A for ; Tue, 7 Jun 2016 16:04:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1DF6C28179; Tue, 7 Jun 2016 16:04:05 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable 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 A757D26E1A for ; Tue, 7 Jun 2016 16:04:04 +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 1bAJSQ-0006eQ-Gz; Tue, 07 Jun 2016 16:02:22 +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 1bAJS3-0005eR-Po for linux-arm-kernel@lists.infradead.org; Tue, 07 Jun 2016 16:02:01 +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 0AB4E7F083; Tue, 7 Jun 2016 16:01:42 +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 u57G1SMA009908; Tue, 7 Jun 2016 12:01:38 -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 2/9] genirq/msi: msi_compose wrapper Date: Tue, 7 Jun 2016 16:01:21 +0000 Message-Id: <1465315288-5931-3-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 [10.5.110.26]); Tue, 07 Jun 2016 16:01:42 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160607_090200_233034_AC5B85A7 X-CRM114-Status: GOOD ( 13.84 ) 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 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); }