Series first introduces generic support for DOE mailboxes as defined in the ECN to the PCI 5.0 specification available from the PCI SIG [0] A user is then introduced in the form of the table access protocol defined in the CXL 2.0 specification [1] used to access the Coherent Device Attribtue Table (CDAT) defined in [2] Various open questions in the individual patches. All testing conducted against QEMU emulation of a CXL type 3 device in conjunction with DOE mailbox patches [3, 4] [0] https://pcisig.com/specifications [1] https://www.computeexpresslink.org/download-the-specification [2] https://uefi.org/node/4093 [3] https://lore.kernel.org/qemu-devel/20210202005948.241655-1-ben.widawsky@xxxxxxxxx/ [4] https://lore.kernel.org/qemu-devel/1612900760-7361-1-git-send-email-cbrowy@xxxxxxxxxxxxxxxx/ Jonathan Cameron (2): PCI/doe: Initial support PCI Data Object Exchange cxl/mem: Add CDAT table reading from DOE drivers/cxl/cdat.h | 79 ++++++++++ drivers/cxl/cxl.h | 13 ++ drivers/cxl/mem.c | 253 +++++++++++++++++++++++++++++- drivers/pci/pcie/Kconfig | 8 + drivers/pci/pcie/Makefile | 1 + drivers/pci/pcie/doe.c | 284 ++++++++++++++++++++++++++++++++++ include/linux/pcie-doe.h | 35 +++++ include/uapi/linux/pci_regs.h | 29 +++- 8 files changed, 700 insertions(+), 2 deletions(-) create mode 100644 drivers/cxl/cdat.h create mode 100644 drivers/pci/pcie/doe.c create mode 100644 include/linux/pcie-doe.h -- 2.19.1
