From patchwork Thu Feb 25 15:10:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 12104337 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18D29C433DB for ; Thu, 25 Feb 2021 15:12:32 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A66D964F10 for ; Thu, 25 Feb 2021 15:12:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A66D964F10 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rmDqNnlFXg0xl9eKUiyHH8GHXjU2OJTSScC4Nvf091g=; b=lnrd/TpXLG1PFU8tNcaoyxlWB jYS7CavG+JqotGhgkdcCwAaobkoZR1SNx8/zzn+VO1Xo4Q44vEmBkJ3535C7mTTtp1YLUhS2Aou07 J3l13NwsOyLiNWKIydas16P4r2tGK2Pg6MM13KKNiYpuJFzh7rKvdHSFXkzD+W6ceFm01SUhnJcUV 5nIug2jFgRjlUZXtqNDziwOlvSYsmuc/N6+RMYt6z39yk09LKu8xoUj5/b2bX/J42w4qwQGyhPPNZ vjvC09ruy7eNpuCn5BKk72L5HWspE+ZDs175zToRcd/5G2yDjw0DSMnWpmVSGrqAx+LHRN02IOC7t Tu9pSXGtw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lFIJM-0005FP-RD; Thu, 25 Feb 2021 15:12:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lFIIG-0004m6-SV; Thu, 25 Feb 2021 15:11:11 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0DCE864F1D; Thu, 25 Feb 2021 15:11:08 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lFIIE-00Fscv-8c; Thu, 25 Feb 2021 15:11:06 +0000 From: Marc Zyngier To: Lorenzo Pieralisi , Bjorn Helgaas Subject: [PATCH 08/13] PCI: MSI: Let PCI host bridges declare their lack of MSI handling Date: Thu, 25 Feb 2021 15:10:18 +0000 Message-Id: <20210225151023.3642391-9-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210225151023.3642391-1-maz@kernel.org> References: <20210225151023.3642391-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: lorenzo.pieralisi@arm.com, bhelgaas@google.com, frank-w@public-files.de, treding@nvidia.com, tglx@linutronix.de, robh@kernel.org, will@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, thierry.reding@gmail.com, jonathanh@nvidia.com, ryder.lee@mediatek.com, marek.vasut+renesas@gmail.com, yoshihiro.shimoda.uh@renesas.com, michal.simek@xilinx.com, paul.walmsley@sifive.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-tegra@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210225_101109_142459_E347C3EC X-CRM114-Status: GOOD ( 14.85 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, Thierry Reding , "K. Y. Srinivasan" , Will Deacon , Marek Vasut , Rob Herring , Wei Liu , Ryder Lee , Stephen Hemminger , Michal Simek , Jonathan Hunter , Thierry Reding , Frank Wunderlich , Haiyang Zhang , linux-mediatek@lists.infradead.org, Paul Walmsley , linux-tegra@vger.kernel.org, Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Yoshihiro Shimoda , linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Thomas Gleixner Some PCI host bridges cannot deal with MSIs at all. This has the unfortunate effect of triggering ugly warnings when an end-point driver requests MSIs. Instead, let the bridge advertise such lack of MSIs, so that it can be flagged correctly by the core code. Signed-off-by: Thomas Gleixner [maz: commit message] Signed-off-by: Marc Zyngier --- drivers/pci/probe.c | 2 ++ include/linux/pci.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index fb04fc81a8bd..146bd85c037e 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -925,6 +925,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge) device_enable_async_suspend(bus->bridge); pci_set_bus_of_node(bus); pci_set_bus_msi_domain(bus); + if (bridge->no_msi) + bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; if (!parent) set_dev_node(bus->bridge, pcibus_to_node(bus)); diff --git a/include/linux/pci.h b/include/linux/pci.h index 105ef1a5191e..9db3abf9fd90 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -550,6 +550,7 @@ struct pci_host_bridge { unsigned int native_dpc:1; /* OS may use PCIe DPC */ unsigned int preserve_config:1; /* Preserve FW resource setup */ unsigned int size_windows:1; /* Enable root bus sizing */ + unsigned int no_msi:1; /* Bridge has no MSI support */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev,