On 8/17/2023 5:46 PM, Ilpo Järvinen wrote:
Hi all, This series adds PCIe bandwidth controller (bwctrl) and associated PCIe cooling driver to the thermal core side for limiting PCIe link speed due to thermal reasons. PCIe bandwidth controller is a PCI express bus port service driver. A cooling device is created for each port the service driver finds if they support changing speeds.
I see we had support for only link speed changes here but we need to add support for
link width change also as bandwidth notification from PCIe supports both link speed and link width.
- KC
bwctrl now is built on top of BW notifications revert. I'm just not sure what is the best practice when re-adding some old functionality in a modified form so please let me know if I need to somehow alter that patch. The series is based on top of the RMW changes in pci/pcie-rmw. Ilpo Järvinen (10): PCI: Protect Link Control 2 Register with RMW locking drm/radeon: Use RMW accessors for changing LNKCTL2 drm/amdgpu: Use RMW accessors for changing LNKCTL2 drm/IB/hfi1: Use RMW accessors for changing LNKCTL2 PCI: Store all PCIe Supported Link Speeds PCI: Cache PCIe device's Supported Speed Vector PCI/LINK: Re-add BW notification portdrv as PCIe BW controller PCI/bwctrl: Add "controller" part into PCIe bwctrl thermal: Add PCIe cooling driver selftests/pcie_bwctrl: Create selftests MAINTAINERS | 8 + drivers/gpu/drm/amd/amdgpu/cik.c | 41 +-- drivers/gpu/drm/amd/amdgpu/si.c | 41 +-- drivers/gpu/drm/radeon/cik.c | 40 +-- drivers/gpu/drm/radeon/si.c | 40 +-- drivers/infiniband/hw/hfi1/pcie.c | 30 +- drivers/pci/pcie/Kconfig | 9 + drivers/pci/pcie/Makefile | 1 + drivers/pci/pcie/bwctrl.c | 309 ++++++++++++++++++ drivers/pci/pcie/portdrv.c | 9 +- drivers/pci/pcie/portdrv.h | 10 +- drivers/pci/probe.c | 38 ++- drivers/pci/remove.c | 2 + drivers/thermal/Kconfig | 10 + drivers/thermal/Makefile | 2 + drivers/thermal/pcie_cooling.c | 107 ++++++ include/linux/pci-bwctrl.h | 33 ++ include/linux/pci.h | 3 + include/uapi/linux/pci_regs.h | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/pcie_bwctrl/Makefile | 2 + .../pcie_bwctrl/set_pcie_cooling_state.sh | 122 +++++++ .../selftests/pcie_bwctrl/set_pcie_speed.sh | 67 ++++ 23 files changed, 795 insertions(+), 131 deletions(-) create mode 100644 drivers/pci/pcie/bwctrl.c create mode 100644 drivers/thermal/pcie_cooling.c create mode 100644 include/linux/pci-bwctrl.h create mode 100644 tools/testing/selftests/pcie_bwctrl/Makefile create mode 100755 tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh create mode 100755 tools/testing/selftests/pcie_bwctrl/set_pcie_speed.sh
