From patchwork Thu Jul 22 21:29:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 12394891 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,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 1CCC6C4338F for ; Thu, 22 Jul 2021 21:29:55 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 D956360EB6 for ; Thu, 22 Jul 2021 21:29:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D956360EB6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 571E16F404; Thu, 22 Jul 2021 21:29:54 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 91B296F384 for ; Thu, 22 Jul 2021 21:29:44 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 2208F60EB4; Thu, 22 Jul 2021 21:29:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1626989384; bh=rWA9U1DI5ZDX+nTcAKFLpU/M8BW7KefHvlzjEfOZ7/E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S1cg5xOweBpPMYAg1YSSjPtL04jR9dkL0cezMFBmBkIWHAo5EFQxpZwY8qDsz9cZG q92L71BIPsEIH+hcGFvoAd9BBxii1w3WHy4SdzCm6q4gG0Av/jaw/z3h0n+e2qF3Qw n9SpL7o6iz9pf5ch+ZEDcX4hd1o9Hct/DN2mbeCzhrjKkgpkrc70xX1a1y+6aenNjf tCxcZ5syzqnmOFR3btXb59G/GP1WiyIxlSBLF7aI8jRvcpNuqTq8vjsZ+eU5r5k9q7 gqVNe6ovdHyG6npARaW8lyrVsph3WWkGG6pjXA97qeVXCTDATy9j2A+Yj8zO+I1eKa FY/Ktn2tLiI8A== From: Bjorn Helgaas To: Huacai Chen Subject: [PATCH v2 8/9] PCI/VGA: Log bridge control messages when adding devices Date: Thu, 22 Jul 2021 16:29:19 -0500 Message-Id: <20210722212920.347118-9-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210722212920.347118-1-helgaas@kernel.org> References: <20210722212920.347118-1-helgaas@kernel.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , dri-devel@lists.freedesktop.org, linux-pci@vger.kernel.org, Bjorn Helgaas , Xuefeng Li Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Huacai Chen 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. [bhelgaas: commit log, split another piece to separate patch, fix list_empty() issue] Link: https://lore.kernel.org/r/20210705100503.1120643-1-chenhuacai@loongson.cn 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 4cecb599f5ed..dd07b1c3205f 100644 --- a/drivers/pci/vgaarb.c +++ b/drivers/pci/vgaarb.c @@ -609,8 +609,10 @@ 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; @@ -649,6 +651,11 @@ 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"); } /* @@ -1527,7 +1534,6 @@ 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) @@ -1543,15 +1549,6 @@ 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"); - } - vga_arb_select_default_device(); pr_info("loaded\n");