Changes since v2 [1]: - Provide comment about what PCI_CXL_LOCK does. - Use "cxl" in place of "pos" where appropriate to make code more descriptive. - Remove unnecessary extra check for pci_is_pcie(dev). - Remove reshuffling of pci_read_config_word() and put them in the right place when first added. - Make inline stubs consistent in format locally. (Bjorn Helgaas) - Add return to inline stubs to fix warning. - Refreshed David's patch (V2) [1] https://lore.kernel.org/linux-pci/20200518163523.1225643-1-sean.v.kelley@xxxxxxxxxxxxxxx/ This patch series implements basic Designated Vendor-Specific Extended Capabilities (DVSEC) decode for Compute eXpress Link devices, a new CPU interconnect building upon PCIe. As a basis for the CXL support it provides PCI init handling for detection, decode, and caching of CXL device capabilities. Moreover, it makes use of the DVSEC Vendor ID and DVSEC ID so as to identify a CXL capable device. (PCIe r5.0, sec 7.9.6.2) DocLink: https://www.computeexpresslink.org/ For your reference, a parallel series of patches have been submitted to enable lspci decode of CXL DVSEC and may be tracked. Link: https://lore.kernel.org/linux-pci/20200511174618.10589-1-sean.v.kelley@xxxxxxxxxxxxxxx/ This patch makes use of pending DVSEC related header additions and the first patch of that series is included here. It can be sorted out when the upstream merge is done. Link: https://lore.kernel.org/linux-pci/20200508021844.6911-2-david.e.box@xxxxxxxxxxxxxxx/ Sample dmesg output of a CXL Type 3 device (CXL.io, CXL.mem): [ 2.997177] pci 0000:6b:00.0: CXL: Cache- IO+ Mem+ Viral- HDMCount 1 [ 2.997188] pci 0000:6b:00.0: CXL: cap ctrl status ctrl2 status2 lock [ 2.997201] pci 0000:6b:00.0: CXL: 001e 0002 0000 0000 0000 0000 David E. Box (1): PCI: Add defines for Designated Vendor-Specific Capability Sean V Kelley (2): PCI: Add basic Compute eXpress Link DVSEC decode PCI: Add helpers to enable/disable CXL.mem and CXL.cache drivers/pci/Kconfig | 9 ++ drivers/pci/Makefile | 1 + drivers/pci/cxl.c | 176 ++++++++++++++++++++++++++++++++++ drivers/pci/pci.h | 15 +++ drivers/pci/probe.c | 1 + include/linux/pci.h | 3 + include/uapi/linux/pci_regs.h | 5 + 7 files changed, 210 insertions(+) create mode 100644 drivers/pci/cxl.c -- 2.26.2
