From patchwork Thu Jan 6 00:06:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 12704903 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id B2489C4332F for ; Thu, 6 Jan 2022 00:07:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 76F2410E53B; Thu, 6 Jan 2022 00:07:26 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7CC9510E537 for ; Thu, 6 Jan 2022 00:07:25 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 550E7619BA; Thu, 6 Jan 2022 00:07:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8AA8C36AEB; Thu, 6 Jan 2022 00:07:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641427643; bh=QvBYfgQFxgIJLEsygEejf0q/8P2zDm4EbtVDmjAMLW4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LlUfS4cfTK2DaHGYqFx6o8so6vN+0fRCV5y4uLSZ8ipPoWXwIHfT6g2Uq/Aa7JI3N ckeVQHF3Kp/alUYxddkIvdl3CctNqrOS3RN0Z6AnelJGaDOnG1Tgg4LaHUzjL3FTfK 3uED0M4WulPkCegDsEvFSN/whg8m/dj2srcZSXXCBsLBLWOBoUw+Uicd/ukQa71EJQ cCQZVtZ8KTXGS2rLFxETKWGB+gxq/Kkh7ASJclhl/a1xBrFhjIxej11+b9eTKD+0R+ u35LpEaNXaKyGezkwnw1SQAeymPHeoIIxNdC55Tdr8S4IDonSupOp+Xx6kIbZygQ0z yZK17rcvPi4+w== From: Bjorn Helgaas To: David Airlie , Daniel Vetter Subject: [PATCH v8 06/10] vgaarb: Move disabled VGA device detection to ADD_DEVICE path Date: Wed, 5 Jan 2022 18:06:54 -0600 Message-Id: <20220106000658.243509-7-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220106000658.243509-1-helgaas@kernel.org> References: <20220106000658.243509-1-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: linux-pci@vger.kernel.org, Huacai Chen , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Zhou Wang , Bjorn Helgaas , Daniel Axtens , Xuefeng Li , Huacai Chen Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Bjorn Helgaas a37c0f48950b ("vgaarb: Select a default VGA device even if there's no legacy VGA") extended the vga_arb_device_init() subsys_initcall so that if there are no other eligible devices, it could select a disabled VGA device as the default. Move this detection from vga_arb_select_default_device() to vga_arbiter_add_pci_device() so every device, even those hot-added or enumerated after vga_arb_device_init() is eligible for selection as the default VGA device. Link: https://lore.kernel.org/r/20211015061512.2941859-5-chenhuacai@loongson.cn Based-on-patch-by: Huacai Chen Signed-off-by: Bjorn Helgaas Cc: Daniel Axtens Cc: Zhou Wang --- drivers/gpu/vga/vgaarb.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c index 123b81628061..ad548917e602 100644 --- a/drivers/gpu/vga/vgaarb.c +++ b/drivers/gpu/vga/vgaarb.c @@ -656,7 +656,8 @@ static bool vga_is_boot_device(struct vga_device *vgadev) * We use the first one we find, so if we've already found one, * vgadev is no better. */ - if (boot_vga) + if (boot_vga && + (boot_vga->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK) return false; if ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK) @@ -693,6 +694,13 @@ static bool vga_is_boot_device(struct vga_device *vgadev) return true; } + /* + * vgadev has neither IO nor MEM enabled. If we haven't found any + * other VGA devices, it is the best candidate so far. + */ + if (!boot_vga) + return true; + return false; } @@ -1559,21 +1567,6 @@ static struct miscdevice vga_arb_device = { MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops }; -static void __init vga_arb_select_default_device(void) -{ - struct vga_device *vgadev; - - if (!vga_default_device()) { - vgadev = list_first_entry_or_null(&vga_list, - struct vga_device, list); - if (vgadev) { - struct device *dev = &vgadev->pdev->dev; - vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n"); - vga_set_default_device(vgadev->pdev); - } - } -} - static int __init vga_arb_device_init(void) { int rc; @@ -1603,8 +1596,6 @@ static int __init vga_arb_device_init(void) vgaarb_info(dev, "no bridge control possible\n"); } - vga_arb_select_default_device(); - pr_info("loaded\n"); return rc; }