[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250626204347.GA1638339@bhelgaas>
Date: Thu, 26 Jun 2025 15:43:47 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Mario Limonciello <superm1@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Lukas Wunner <lukas@...ner.de>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Woodhouse <dwmw2@...radead.org>,
Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
Alex Williamson <alex.williamson@...hat.com>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux.dev>,
"open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
"open list:VFIO DRIVER" <kvm@...r.kernel.org>,
"open list:SOUND" <linux-sound@...r.kernel.org>,
Daniel Dadap <ddadap@...dia.com>,
Mario Limonciello <mario.limonciello@....com>,
Simona Vetter <simona.vetter@...ll.ch>
Subject: Re: [PATCH v5 1/9] PCI: Add helper for checking if a PCI device is a
display controller
On Tue, Jun 24, 2025 at 03:30:34PM -0500, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
>
> 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.
>
> Reviewed-by: Daniel Dadap <ddadap@...dia.com>
> Reviewed-by: Simona Vetter <simona.vetter@...ll.ch>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Not sure how this should be merged, let me know if you want me to do
something with it.
> ---
> 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;
> }
>
> +/**
> + * 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) == 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
> --
> 2.43.0
>
Powered by blists - more mailing lists