v1 -> v2: - Move the code of new bridge to hw/pci-host/cxl.c - Fix and simplify some logic on handling the different bridge types
Background ========== Currently the base CXL support for arm platforms is only on Jonathan's patches[1]. Some platform like SBSA-REF can be more like a real machine, thus the support of cxl could be meaningful. However, the pxb-cxl-host realization on this platform seems not satisfying their requirements[2]. New CXL HOST design =================== This work defines a new cxl host bridge type (TYPE_CXL_HOST). This could be considered as a prototype of an independent cxl host bridge which combines gpex features (ecam, mmio windows & irq) and CXL features. The root bus path of CXL_HOST is "0001:00", that would not affect the original pcie host topology. In the previous, the pxb-cxl-host with any cxl root ports and cxl endpoint devices would occupy the BDF number of the original pcie domain. This new type provide a solution to resolve the problem. Remaining problems ================== I tried to use 'object_resolve_path' but it could not work in 'cxl_fmws_link_targets', so I used 'TYPE_DEVICE' to match that. Yuquan Wang (2): hw/pxb-cxl: Rename the pxb cxl host bridge pci-host/cxl: Support creation of a new CXL Host Bridge hw/cxl/cxl-host-stubs.c | 2 + hw/cxl/cxl-host.c | 66 +++++++++--- hw/pci-bridge/pci_expander_bridge.c | 8 +- hw/pci-host/cxl.c | 145 ++++++++++++++++++++++++++ hw/pci-host/meson.build | 1 + include/hw/cxl/cxl.h | 7 +- include/hw/cxl/cxl_host.h | 2 + include/hw/pci-host/cxl_host_bridge.h | 25 +++++ 8 files changed, 234 insertions(+), 22 deletions(-) create mode 100644 hw/pci-host/cxl.c create mode 100644 include/hw/pci-host/cxl_host_bridge.h -- 2.34.1
