Re: [PATCH v2 0/9] Improvements to pcie_bandwidth_available() for eGPUs

[Bjorn Helgaas]

On Fri, Nov 03, 2023 at 02:07:49PM -0500, Mario Limonciello wrote:
> Downstream drivers are getting the wrong values from
> pcie_bandwidth_available() which is causing problems for performance
> of eGPUs.
> 
> This series overhauls Thunderbolt related device detection and uses
> the changes to change the behavior of pcie_bandwidth_available().
> 
> NOTE: This series is currently based on top of v6.6 + this change that
>       will be merged for 6.7:
> Link: https://patchwork.freedesktop.org/patch/564738/

Thanks, Mario, I'll look at this soon after v6.7-rc1 (probably Nov
12), so the amdgpu patch should be in mainline by then.

> v1->v2:
>  * Rename is_thunderbolt
>  * Look for _DSD instead of link
>  * Drop pci_is_thunderbolt_attached() from all drivers
>  * Adjust links
>  * Adjust commit messages
>  * Add quirk for Tiger Lake
> 
> Mario Limonciello (9):
>   drm/nouveau: Switch from pci_is_thunderbolt_attached() to
>     dev_is_removable()
>   drm/radeon: Switch from pci_is_thunderbolt_attached() to
>     dev_is_removable()
>   PCI: Drop pci_is_thunderbolt_attached()
>   PCI: Move the `PCI_CLASS_SERIAL_USB_USB4` definition to common header
>   PCI: pciehp: Move check for is_thunderbolt into a quirk
>   PCI: Rename is_thunderbolt to is_tunneled
>   PCI: ACPI: Detect PCIe root ports that are used for tunneling
>   PCI: Exclude PCIe ports used for tunneling in
>     pcie_bandwidth_available()
>   PCI: Add a quirk to mark 0x8086 : 0x9a23 as supporting PCIe tunneling
> 
>  drivers/gpu/drm/nouveau/nouveau_vga.c  |  6 +-
>  drivers/gpu/drm/radeon/radeon_device.c |  4 +-
>  drivers/gpu/drm/radeon/radeon_kms.c    |  2 +-
>  drivers/pci/hotplug/pciehp_hpc.c       |  6 +-
>  drivers/pci/pci-acpi.c                 | 16 ++++++
>  drivers/pci/pci.c                      | 76 +++++++++++++++++---------
>  drivers/pci/probe.c                    |  2 +-
>  drivers/pci/quirks.c                   | 31 +++++++++++
>  drivers/platform/x86/apple-gmux.c      |  2 +-
>  drivers/thunderbolt/nhi.h              |  2 -
>  include/linux/pci.h                    | 25 +--------
>  include/linux/pci_ids.h                |  1 +
>  12 files changed, 109 insertions(+), 64 deletions(-)
> 
> -- 
> 2.34.1
>