linux-kernel - Re: [PATCH v3 2/7] drm/radeon: Switch from pci_is_thunderbolt_attached() to dev_is

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Message-ID: <5fa7aab7-3bf9-4491-a822-fd686efa5376@amd.com>
Date:   Wed, 15 Nov 2023 10:27:31 +0100
From:   Christian König <christian.koenig@....com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>
Cc:     Danilo Krummrich <dakr@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Xinhui Pan <Xinhui.Pan@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Pali Rohár <pali@...nel.org>,
        Marek Behún <kabel@...nel.org>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        Manivannan Sadhasivam <mani@...nel.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:RADEON and AMDGPU DRM DRIVERS" 
        <amd-gfx@...ts.freedesktop.org>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v3 2/7] drm/radeon: Switch from
 pci_is_thunderbolt_attached() to dev_is_removable()

Am 14.11.23 um 21:07 schrieb Mario Limonciello:
> pci_is_thunderbolt_attached() looks at the hierarchy of the PCIe device
> to determine if any bridge along the way has the is_thunderbolt bit set.
> This bit will only be set when one of the devices in the hierarchy is an
> Intel Thunderbolt device.
>
> However PCIe devices can be connected to USB4 hubs and routers which won't
> necessarily set the is_thunderbolt bit. These devices will however be
> marked as externally facing which means they are marked removable by
> pci_set_removable().
>
> Look whether the device is marked removable to determine it's
> connected to a Thunderbolt controller or USB4 router.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Acked-by: Christian König <christian.koenig@....com> for this one.

> ---
> v2->v3:
>   * Update commit message
> ---
>   drivers/gpu/drm/radeon/radeon_device.c | 4 ++--
>   drivers/gpu/drm/radeon/radeon_kms.c    | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
> index afbb3a80c0c6..ba0ca0694d18 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -1429,7 +1429,7 @@ int radeon_device_init(struct radeon_device *rdev,
>   
>   	if (rdev->flags & RADEON_IS_PX)
>   		runtime = true;
> -	if (!pci_is_thunderbolt_attached(rdev->pdev))
> +	if (!dev_is_removable(&rdev->pdev->dev))
>   		vga_switcheroo_register_client(rdev->pdev,
>   					       &radeon_switcheroo_ops, runtime);
>   	if (runtime)
> @@ -1519,7 +1519,7 @@ void radeon_device_fini(struct radeon_device *rdev)
>   	radeon_bo_evict_vram(rdev);
>   	radeon_audio_component_fini(rdev);
>   	radeon_fini(rdev);
> -	if (!pci_is_thunderbolt_attached(rdev->pdev))
> +	if (!dev_is_removable(&rdev->pdev->dev))
>   		vga_switcheroo_unregister_client(rdev->pdev);
>   	if (rdev->flags & RADEON_IS_PX)
>   		vga_switcheroo_fini_domain_pm_ops(rdev->dev);
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index a16590c6247f..ead912a58ab8 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -138,7 +138,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
>   	if ((radeon_runtime_pm != 0) &&
>   	    radeon_has_atpx() &&
>   	    ((flags & RADEON_IS_IGP) == 0) &&
> -	    !pci_is_thunderbolt_attached(pdev))
> +	    !dev_is_removable(&pdev->dev))
>   		flags |= RADEON_IS_PX;
>   
>   	/* radeon_device_init should report only fatal error