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[RFC,0/2] PCI Data Object Exchange support + CXL CDAT

Message ID 20210310180306.1588376-1-Jonathan.Cameron@huawei.com
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Series PCI Data Object Exchange support + CXL CDAT | expand

Message

Jonathan Cameron March 10, 2021, 6:03 p.m. UTC 
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@intel.com/
[4] https://lore.kernel.org/qemu-devel/1612900760-7361-1-git-send-email-cbrowy@avery-design.com/

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