From patchwork Mon Mar 22 18:46:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 12155921 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=-17.2 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 C78D2C433DB for ; Mon, 22 Mar 2021 18:55:18 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 3EB4B619A0 for ; Mon, 22 Mar 2021 18:55:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3EB4B619A0 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=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=hCmKjQxj4ayUdxc0RVt3n6S8Fa/fkQVgGNjdrS+ROTM=; b=bWPaLhSymxBniVumZtHROVbOv fzUYvM0cd0JicoXLbpLwnRRIp1UDUDoGpT2NcEU+sZ9eESpe2Tyz3JrXPlC0+lVnZizJRc+taCVFv k+5oMw+gkox9A7srWBVAG7GZ3iDCl+FRd8jPAosiGNpUB75tdTgq+MUm0Y9ynmzMM2jSPow8HQuup 8WBpT12IOxPAr69I6bDr+tOwL8j+dqyK0lzGrmAqoKcz8/V6/p4oSQ4JLTR8TbqHZiw57UqjmVUay Yip4wBJGkaK0937r87PCvMyP/XNWeTp4XRDUQ35U+D4AOGLU+OLfA3KeZdsmNcfo6ByvTid/5nXM5 P+deMK9YQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lOPhg-00CLMe-Rv; Mon, 22 Mar 2021 18:55:05 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lOPgR-00CKuV-EL; Mon, 22 Mar 2021 18:53:50 +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 1C6B161998; Mon, 22 Mar 2021 18:53:46 +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 1lOPZR-0038p5-66; Mon, 22 Mar 2021 18:46:33 +0000 From: Marc Zyngier To: Lorenzo Pieralisi , Bjorn Helgaas Cc: Frank Wunderlich , Thierry Reding , Thomas Gleixner , Rob Herring , Will Deacon , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Michael Kelley , Wei Liu , Thierry Reding , Jonathan Hunter , Ryder Lee , Marek Vasut , Yoshihiro Shimoda , Michal Simek , Paul Walmsley , 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, kernel-team@android.com Subject: [PATCH v2 10/15] PCI/MSI: Let PCI host bridges declare their lack of MSI handling Date: Mon, 22 Mar 2021 18:46:09 +0000 Message-Id: <20210322184614.802565-11-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210322184614.802565-1-maz@kernel.org> References: <20210322184614.802565-1-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, mikelley@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, kernel-team@android.com 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-20210322_185348_472175_D3F5FB96 X-CRM114-Status: GOOD ( 14.01 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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. Acked-by: Bjorn Helgaas 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 ebf557e59d87..48605cca82ae 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,