lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CADnq5_PCHZtmGN4Frknz+10xVMypwpDuW7_kYbTmvihcayCPew@mail.gmail.com>
Date: Mon, 14 Oct 2024 11:45:34 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Mario Limonciello <superm1@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, 
	"open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, 
	dri-devel@...ts.freedesktop.org, 
	Mario Limonciello <mario.limonciello@....com>, Alex Deucher <alexander.deucher@....com>, 
	"Luke D . Jones" <luke@...nes.dev>
Subject: Re: [PATCH] PCI/VGA: Don't assume only VGA device found is the boot
 VGA device

On Mon, Oct 14, 2024 at 11:25 AM Mario Limonciello <superm1@...nel.org> wrote:
>
> From: Mario Limonciello <mario.limonciello@....com>
>
> The ASUS GA605W has a NVIDIA PCI VGA device and an AMD PCI display device.
>
> ```
> 65:00.0 VGA compatible controller: NVIDIA Corporation AD106M [GeForce RTX 4070 Max-Q / Mobile] (rev a1)
> 66:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Strix [Radeon 880M / 890M] (rev c1)
> ```

For clarity, the iGPU is not a VGA class device.  The "primary" should
not have any dependency on the VGA PCI class, but I'm not sure how
exactly the kernel handles this case.  In this case, the primary
should be the iGPU which is not a VGA PCI class device.

Alex

>
> The fallback logic in vga_is_boot_device() flags the NVIDIA dGPU as the
> boot VGA device, but really the eDP is connected to the AMD PCI display
> device.
>
> Drop this case to avoid marking the NVIDIA dGPU as the boot VGA device.
>
> Suggested-by: Alex Deucher <alexander.deucher@....com>
> Reported-by: Luke D. Jones <luke@...nes.dev>
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3673
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/pci/vgaarb.c | 7 -------
>  1 file changed, 7 deletions(-)
>
> diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
> index 78748e8d2dba..05ac2b672d4b 100644
> --- a/drivers/pci/vgaarb.c
> +++ b/drivers/pci/vgaarb.c
> @@ -675,13 +675,6 @@ 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;
>  }
>
> --
> 2.43.0
>

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ