From patchwork Fri Oct 13 03:47:29 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 10003439 X-Patchwork-Delegate: bhelgaas@google.com 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 9C49860216 for ; Fri, 13 Oct 2017 03:47:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9022228E87 for ; Fri, 13 Oct 2017 03:47:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 84AA228F4A; Fri, 13 Oct 2017 03:47:33 +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=-6.9 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2591B28E87 for ; Fri, 13 Oct 2017 03:47:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753576AbdJMDrc (ORCPT ); Thu, 12 Oct 2017 23:47:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:44362 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753427AbdJMDrc (ORCPT ); Thu, 12 Oct 2017 23:47:32 -0400 Received: from localhost (unknown [69.71.4.159]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0D1CB21914; Fri, 13 Oct 2017 03:47:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D1CB21914 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=helgaas@kernel.org Subject: [PATCH v2 2/2] vgaarb: Factor out EFI and fallback default device selection From: Bjorn Helgaas To: Daniel Vetter Cc: Lorenzo Pieralisi , Gabriele Paoloni , Ard Biesheuvel , linux-pci@vger.kernel.org, Catalin Marinas , Will Deacon , dri-devel@lists.freedesktop.org, Xinliang Liu , Alex Williamson , Lukas Wunner , Benjamin Herrenschmidt , Rongrong Zou , Dave Airlie , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, Daniel Axtens Date: Thu, 12 Oct 2017 22:47:29 -0500 Message-ID: <20171013034729.14630.30419.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <20171013034338.14630.4766.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <20171013034338.14630.4766.stgit@bhelgaas-glaptop.roam.corp.google.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The default VGA device is normally set in vga_arbiter_add_pci_device() when we call it for the first enabled device that can be accessed with the legacy VGA resources ([mem 0xa0000-0xbffff], etc.) That default device can be overridden by an EFI device that owns the boot framebuffer. As a fallback, we can also select a VGA device that can't be accessed via legacy VGA resources, or a VGA device that isn't even enabled. Factor out this EFI and fallback selection from vga_arb_device_init() into a separate vga_arb_select_default_device() function. This doesn't change any behavior, but it untangles the "bridge control possible" checking and messages from the default device selection. Tested-by: Zhou Wang # D05 Hisi Hip07, Hip08 Signed-off-by: Bjorn Helgaas Reviewed-by: Daniel Axtens Acked-by: Ard Biesheuvel Reviewed-by: Daniel Axtens --- drivers/gpu/vga/vgaarb.c | 57 ++++++++++++++++++++++++++++------------------ 1 file changed, 35 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c index 8035e38d5110..d35d6d271f3f 100644 --- a/drivers/gpu/vga/vgaarb.c +++ b/drivers/gpu/vga/vgaarb.c @@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = { MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops }; -static int __init vga_arb_device_init(void) +static void __init vga_arb_select_default_device(void) { - int rc; struct pci_dev *pdev; struct vga_device *vgadev; - rc = misc_register(&vga_arb_device); - if (rc < 0) - pr_err("error %d registering device\n", rc); - - bus_register_notifier(&pci_bus_type, &pci_notifier); - - /* We add all pci devices satisfying vga class in the arbiter by - * default */ - pdev = NULL; - while ((pdev = - pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, - PCI_ANY_ID, pdev)) != NULL) - vga_arbiter_add_pci_device(pdev); - +#if defined(CONFIG_X86) || defined(CONFIG_IA64) list_for_each_entry(vgadev, &vga_list, list) { struct device *dev = &vgadev->pdev->dev; -#if defined(CONFIG_X86) || defined(CONFIG_IA64) /* * Override vga_arbiter_add_pci_device()'s I/O based detection * as it may take the wrong device (e.g. on Apple system under @@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void) vgaarb_info(dev, "overriding boot device\n"); vga_set_default_device(vgadev->pdev); } -#endif - if (vgadev->bridge_has_one_vga) - vgaarb_info(dev, "bridge control possible\n"); - else - vgaarb_info(dev, "no bridge control possible\n"); } +#endif if (!vga_default_device()) { list_for_each_entry(vgadev, &vga_list, list) { @@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void) vga_set_default_device(vgadev->pdev); } } +} + +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) + pr_err("error %d registering device\n", rc); + + bus_register_notifier(&pci_bus_type, &pci_notifier); + + /* We add all PCI devices satisfying VGA class in the arbiter by + * default */ + pdev = NULL; + while ((pdev = + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, + 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"); return rc;