From patchwork Sat Sep 11 09:30:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 12486269 X-Patchwork-Delegate: bhelgaas@google.com 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,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 2AB3DC433EF for ; Sat, 11 Sep 2021 09:37:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08491611BF for ; Sat, 11 Sep 2021 09:37:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235571AbhIKJiZ (ORCPT ); Sat, 11 Sep 2021 05:38:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:45102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235568AbhIKJiZ (ORCPT ); Sat, 11 Sep 2021 05:38:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D0DC2610F8; Sat, 11 Sep 2021 09:37:09 +0000 (UTC) From: Huacai Chen To: David Airlie , Daniel Vetter , Bjorn Helgaas Cc: linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, Xuefeng Li , Huacai Chen , Huacai Chen Subject: [PATCH V5 09/11] PCI/VGA: Log bridge control messages when adding devices Date: Sat, 11 Sep 2021 17:30:54 +0800 Message-Id: <20210911093056.1555274-10-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210911093056.1555274-1-chenhuacai@loongson.cn> References: <20210911093056.1555274-1-chenhuacai@loongson.cn> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Previously vga_arb_device_init() iterated through all VGA devices and indicated whether legacy VGA routing to each could be controlled by an upstream bridge. But we determine that information in vga_arbiter_add_pci_device(), which we call for every device, so we can log it there without iterating through the VGA devices again. Note that we call vga_arbiter_check_bridge_sharing() before adding the device to vga_list, so we have to handle the very first device separately. Signed-off-by: Huacai Chen Signed-off-by: Bjorn Helgaas --- drivers/pci/vgaarb.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c index 1a829cbacbc8..5a042f9ac82c 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -672,8 +672,10 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev) vgadev->bridge_has_one_vga = true; - if (list_empty(&vga_list)) + if (list_empty(&vga_list)) { + vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n"); return; + } /* okay iterate the new devices bridge hierarachy */ new_bus = vgadev->pdev->bus; @@ -712,6 +714,11 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev) } new_bus = new_bus->parent; } + + if (vgadev->bridge_has_one_vga) + vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n"); + else + vgaarb_info(&vgadev->pdev->dev, "no bridge control possible\n"); } /* @@ -1504,7 +1511,6 @@ static int __init vga_arb_device_init(void) { int rc; struct pci_dev *pdev; - struct vga_device *vgadev; rc = misc_register(&vga_arb_device); if (rc < 0) @@ -1520,15 +1526,6 @@ static int __init vga_arb_device_init(void) PCI_ANY_ID, pdev)) != NULL) vga_arbiter_add_pci_device(pdev); - list_for_each_entry(vgadev, &vga_list, list) { - struct device *dev = &vgadev->pdev->dev; - - if (vgadev->bridge_has_one_vga) - vgaarb_info(dev, "bridge control possible\n"); - else - vgaarb_info(dev, "no bridge control possible\n"); - } - return rc; } subsys_initcall(vga_arb_device_init);