[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <5b6fdf65-b354-94a9-f883-be820157efad@amd.com>
Date: Mon, 19 Jun 2023 13:12:52 -0500
From: "Limonciello, Mario" <mario.limonciello@....com>
To: Sui Jingfeng <15330273260@....cn>,
Alex Deucher <alexander.deucher@....com>,
Christian Konig <christian.koenig@....com>,
Pan Xinhui <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Ben Skeggs <bskeggs@...hat.com>,
Karol Herbst <kherbst@...hat.com>,
Lyude Paul <lyude@...hat.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Alex Williamson <alex.williamson@...hat.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Hawking Zhang <Hawking.Zhang@....com>,
Lijo Lazar <lijo.lazar@....com>,
YiPeng Chai <YiPeng.Chai@....com>,
Andrey Grodzovsky <andrey.grodzovsky@....com>,
Somalapuram Amaranath <Amaranath.Somalapuram@....com>,
Bokun Zhang <Bokun.Zhang@....com>,
Ville Syrjala <ville.syrjala@...ux.intel.com>,
Li Yi <liyi@...ngson.cn>,
Sui Jingfeng <suijingfeng@...ngson.cn>,
Jason Gunthorpe <jgg@...pe.ca>,
Kevin Tian <kevin.tian@...el.com>,
Cornelia Huck <cohuck@...hat.com>,
Yishai Hadas <yishaih@...dia.com>,
Abhishek Sahu <abhsahu@...dia.com>, Yi Liu <yi.l.liu@...el.com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
nouveau@...ts.freedesktop.org, linux-pci@...r.kernel.org,
kvm@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v6 2/8] PCI/VGA: Deal only with VGA class devices
On 6/12/2023 2:25 PM, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>
> Deal only with the VGA devcie(pdev->class == 0x0300), so replace the
> pci_get_subsys() function with pci_get_class(). Filter the non-PCI display
> device(pdev->class != 0x0300) out. There no need to process the non-display
> PCI device.
>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
This also means that deleting a PCI device no longer needs
to walk the list.
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> drivers/pci/vgaarb.c | 22 ++++++++++++----------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
> index c1bc6c983932..22a505e877dc 100644
> --- a/drivers/pci/vgaarb.c
> +++ b/drivers/pci/vgaarb.c
> @@ -754,10 +754,6 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
> struct pci_dev *bridge;
> u16 cmd;
>
> - /* Only deal with VGA class devices */
> - if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
> - return false;
> -
> /* Allocate structure */
> vgadev = kzalloc(sizeof(struct vga_device), GFP_KERNEL);
> if (vgadev == NULL) {
> @@ -1500,7 +1496,9 @@ static int pci_notify(struct notifier_block *nb, unsigned long action,
> struct pci_dev *pdev = to_pci_dev(dev);
> bool notify = false;
>
> - vgaarb_dbg(dev, "%s\n", __func__);
> + /* Only deal with VGA class devices */
> + if (pdev->class != PCI_CLASS_DISPLAY_VGA << 8)
> + return 0;
>
> /* For now we're only intereted in devices added and removed. I didn't
> * test this thing here, so someone needs to double check for the
> @@ -1510,6 +1508,8 @@ static int pci_notify(struct notifier_block *nb, unsigned long action,
> else if (action == BUS_NOTIFY_DEL_DEVICE)
> notify = vga_arbiter_del_pci_device(pdev);
>
> + vgaarb_dbg(dev, "%s: action = %lu\n", __func__, action);
> +
> if (notify)
> vga_arbiter_notify_clients();
> return 0;
> @@ -1534,8 +1534,8 @@ static struct miscdevice vga_arb_device = {
>
> static int __init vga_arb_device_init(void)
> {
> + struct pci_dev *pdev = NULL;
> int rc;
> - struct pci_dev *pdev;
>
> rc = misc_register(&vga_arb_device);
> if (rc < 0)
> @@ -1545,11 +1545,13 @@ static int __init vga_arb_device_init(void)
>
> /* 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)
> + while (1) {
> + pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev);
> + if (!pdev)
> + break;
> +
> vga_arbiter_add_pci_device(pdev);
> + }
>
> pr_info("loaded\n");
> return rc;
Powered by blists - more mailing lists