From nobody Thu Oct 9 14:42:19 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E38A927703C; Tue, 17 Jun 2025 17:59:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750183161; cv=none; b=SIufsVD4LKMhFyxuZKgnImowMb1we10VtFwMz2jhp60jqrGL2Tg1sQ1caCBFH55sDZAGI1LcBwlktzcDH42ynnoH0OEL+8nUduj2qxKjPbR9ORZPhCvpVd1PhIOGYp3HKHuT+MoSwt/48V07dIjHX3ZqCn++NEKaN+aV2Q0oNms= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750183161; c=relaxed/simple; bh=guzSVFa4kwHai9EZMK8+P7TeBT5zm7vwCIz/+uGdD5o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d5gVOcIkLBnMAVe14zsR1/nXHy1wRoa4K1ZaGmM8S+VbTHzXudna+F30toXiac/M/y05JXrWgOPLVqJG3ZsU/Zyu0yZh0gH4mdx1q4G0rjbHNvXW8cKZ0Un01NKW0ThL/CZRpxGbRBKSDl5UTcHUqtyr0aVlvxXpL//bUs5Ng+4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SMAx7yhu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SMAx7yhu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F19ADC4CEF2; Tue, 17 Jun 2025 17:59:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750183160; bh=guzSVFa4kwHai9EZMK8+P7TeBT5zm7vwCIz/+uGdD5o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SMAx7yhuA28BYQvwArliGoV3yuWcx5cJN5pyKXWKNMXwxMZiLy8mnBJhPKqheazTl WaTD1JZpn4HgNmXP6xrXDqTQ8T2aZOgVG/y15CbZVYG5PpMBdpGy4VocI20M+H8dO7 KFq5sMI7BkgJnwb2xyj8hKh5qAi1nGRLG5RpCouM6aJVvCZRUx2hymsiI9vO41Q8/N DpXuoO0qRis9A38gAAqG40bazMRa5RvuzO8dVGUelKGlwsZHcP+fF2aTkdt8hswZPo VXL0ibNhW+1WKJaqpnCxfk8E1JYsHUyWZ3zRgDMEQm43lQl80XCWfLGtaqUcvc9ZaU /BHuTK+gUkGnQ== From: Mario Limonciello To: Bjorn Helgaas Cc: Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Simona Vetter , Lukas Wunner , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Woodhouse , Lu Baolu , Joerg Roedel , Will Deacon , Robin Murphy , Alex Williamson , Jaroslav Kysela , Takashi Iwai , dri-devel@lists.freedesktop.org (open list:DRM DRIVERS), linux-kernel@vger.kernel.org (open list), iommu@lists.linux.dev (open list:INTEL IOMMU (VT-d)), linux-pci@vger.kernel.org (open list:PCI SUBSYSTEM), kvm@vger.kernel.org (open list:VFIO DRIVER), linux-sound@vger.kernel.org (open list:SOUND), Daniel Dadap , Mario Limonciello Subject: [PATCH v2 1/6] PCI: Add helper for checking if a PCI device is a display controller Date: Tue, 17 Jun 2025 12:59:05 -0500 Message-ID: <20250617175910.1640546-2-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250617175910.1640546-1-superm1@kernel.org> References: <20250617175910.1640546-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mario Limonciello Several places in the kernel do class shifting to match whether a PCI device is display class. Introduce a helper for those places to use. Signed-off-by: Mario Limonciello --- include/linux/pci.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/pci.h b/include/linux/pci.h index 05e68f35f3923..e77754e43c629 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -744,6 +744,21 @@ static inline bool pci_is_vga(struct pci_dev *pdev) return false; } =20 +/** + * pci_is_display - Check if a PCI device is a display controller + * @pdev: Pointer to the PCI device structure + * + * This function determines whether the given PCI device corresponds + * to a display controller. Display controllers are typically used + * for graphical output and are identified based on their class code. + * + * Return: true if the PCI device is a display controller, false otherwise. + */ +static inline bool pci_is_display(struct pci_dev *pdev) +{ + return (pdev->class >> 16) =3D=3D PCI_BASE_CLASS_DISPLAY; +} + #define for_each_pci_bridge(dev, bus) \ list_for_each_entry(dev, &bus->devices, bus_list) \ if (!pci_is_bridge(dev)) {} else --=20 2.43.0