linux-kernel - [PATCH 00/10] Add PCIe Bandwidth Controller

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Date:   Thu, 17 Aug 2023 15:16:58 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Lukas Wunner <lukas@...ner.de>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Alex Deucher <alexdeucher@...il.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 00/10] Add PCIe Bandwidth Controller

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.

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

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2.30.2