Major changes since v2: - Clarify encoded region/granularity from raw values - Rename "region" to cxlr everywhere - Kconfig for the region driver - Several small bug fixes https://gitlab.com/bwidawsk/linux/-/tree/cxl_region-v3 Original commit message follows with minor updates for correctness. --- This patch series introduces the CXL region driver as well as associated APIs in CXL core. The region driver enables the creation of "regions" which is a concept defined by the CXL 2.0 specification [1]. Region verification and programming state are owned by the cxl_region driver (implemented in the cxl_region module). It relies on cxl_mem to determine if devices are CXL routed, and cxl_port to actually handle the programming of the HDM decoders. Much of the region driver is an implementation of algorithms described in the CXL Type 3 Memory Device Software Guide [2]. The region driver will be responsible for configuring regions found on persistent capacities in the Label Storage Area (LSA), it will also enumerate regions configured by BIOS, usually volatile capacities, and will allow for dynamic region creation (which can then be stored in the LSA). It is the primary consumer of the CXL Port [3] and CXL Mem drivers introduced previously [4]. The patches for the region driver could be squashed. They're broken out to aid review and because that's the order they were implemented in. My preference is to keep those as they are. Some things are still missing and will be worked on while these are reviewed (in priority order): 1. Volatile regions creation and enumeration (Have a plan) 2. multi-level switches 3. Decoder programming restrictions (No plan). The one know restriction I've missed is to disallow programming HDM decoders that aren't in incremental system physical address ranges. 4. CXL region teardown -> nd_region teardown 5. Stress testing [1]: https://www.computeexpresslink.org/download-the-specification [2]: https://cdrdv2.intel.com/v1/dl/getContent/643805?wapkw=CXL%20memory%20device%20sw%20guide [3]: https://lore.kernel.org/linux-cxl/164298424635.3018233.9356036382052246767.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u [4]: https://lore.kernel.org/linux-cxl/164298429450.3018233.13269591903486669825.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u --- Ben Widawsky (14): cxl/region: Add region creation ABI cxl/region: Introduce concept of region configuration cxl/mem: Cache port created by the mem dev cxl/region: Introduce a cxl_region driver cxl/acpi: Handle address space allocation cxl/region: Address space allocation cxl/region: Implement XHB verification cxl/region: HB port config verification cxl/region: Add infrastructure for decoder programming cxl/region: Collect host bridge decoders cxl/region: Add support for single switch level cxl: Program decoders for regions cxl/pmem: Convert nvdimm bridge API to use dev cxl/region: Create an nd_region .clang-format | 3 + Documentation/ABI/testing/sysfs-bus-cxl | 64 ++ .../driver-api/cxl/memory-devices.rst | 14 + drivers/cxl/Kconfig | 5 + drivers/cxl/Makefile | 2 + drivers/cxl/acpi.c | 30 + drivers/cxl/core/Makefile | 1 + drivers/cxl/core/core.h | 4 + drivers/cxl/core/hdm.c | 209 +++++ drivers/cxl/core/pmem.c | 28 +- drivers/cxl/core/port.c | 105 ++- drivers/cxl/core/region.c | 529 +++++++++++ drivers/cxl/cxl.h | 76 +- drivers/cxl/cxlmem.h | 9 + drivers/cxl/mem.c | 35 +- drivers/cxl/pmem.c | 2 +- drivers/cxl/port.c | 62 +- drivers/cxl/region.c | 866 ++++++++++++++++++ drivers/cxl/region.h | 47 + tools/testing/cxl/Kbuild | 1 + 20 files changed, 2077 insertions(+), 15 deletions(-) create mode 100644 drivers/cxl/core/region.c create mode 100644 drivers/cxl/region.c create mode 100644 drivers/cxl/region.h base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07 prerequisite-patch-id: 90de8aefc2999f55c7534fefa971d95653c4220c prerequisite-patch-id: 32a5b56d83bf3372b6ed4b40f621eafb33a7201b prerequisite-patch-id: f827831bb7a23e0789d16d7b8979b165253c6301 prerequisite-patch-id: 08b8febd42d3ab508b618937473807e553589e36 prerequisite-patch-id: 18049f47c948582c1dc26348d9765c934eb82a75 prerequisite-patch-id: 8f66d52af297449fa007a0ba963c5239b153ef5b prerequisite-patch-id: 3e2e86cbc2631b99c1b5c0179f35799d3df31f91 prerequisite-patch-id: b88becd4997320a34e918cdef1b620e6dea14917 prerequisite-patch-id: c61df81018f2a93b87d10965b418afa659d9d6d6 prerequisite-patch-id: 73b31df62e00bb7af7082e2ca4d40023a7962abd prerequisite-patch-id: 207abfcd5028c41df8875ee795a8ab697cd7c688 prerequisite-patch-id: 26978f021b3b0f4a6734ef8c0100c724dc88742e prerequisite-patch-id: bf229ca5aab5c5dffe69ba5b9380749a66cf20ba prerequisite-patch-id: 20ebefe1acfdecf184d048cb605368e1863646c1 prerequisite-patch-id: f34c26e902dd868dc1c3ef8ba8246cc063cf991a prerequisite-patch-id: bcc59db1c6528244b649ced35eab015699c410fa prerequisite-patch-id: 2f9f6cfbd6b73a563498c6b6d721bbc169a0a414 prerequisite-patch-id: dc8fb216dc8ff4f813bfc689273d9c5f5124e789 prerequisite-patch-id: da83e8074d339426c886c481070366afb189b561 prerequisite-patch-id: 501fe71f19065ba9f31cabd86756fedda853c414 prerequisite-patch-id: ceeef31c2ca85a426d507563b886347d28acc322 prerequisite-patch-id: f876c09942ae5a3223a36329c23262a05b2669f4 prerequisite-patch-id: 44fa61c5569614c8d9df854cde6fedfc2bc78c12 prerequisite-patch-id: 04ad90e1bbb5646125c4633fbe5341f572bc9548 prerequisite-patch-id: f4dbf89d99917f50c30e1ee56bfeff8d8dd6b0f3 prerequisite-patch-id: 2d7c3aacefcb8133897e3256ed6f76952555c2f1 prerequisite-patch-id: 7454df4bdb07381f02717845eb3b17011a89ab18 prerequisite-patch-id: 52ec0dfd506bb6a3f8d11a914cfc7320193a6445 prerequisite-patch-id: 9de14fa54cfba412e09d7b41f392c0f6d55d6a01 prerequisite-patch-id: ae39a482c2067a1f04baee5ce9131901e6d359ec prerequisite-patch-id: 446240d2ed24d9e55ac9edfc65b511495659464a prerequisite-patch-id: ba6bf6450e47df5e95e2fb1780d9edd126bc0eb2 prerequisite-patch-id: 3c0865b6dd062e677ef8e160e14f823622eafb9f prerequisite-patch-id: 4503f5507cbdeb0770b420b4c26d87be2b173813 prerequisite-patch-id: c5a8cbda77c95b052040770eca0dc5b99876dc66 prerequisite-patch-id: e064003a6c48131fac401d9a48d4d6204fea6123 prerequisite-patch-id: b4c7213971c981dd5ca0fda992643a7c61548fef prerequisite-patch-id: 2bd09e27f8a8df144a8ad386822390c87ef46ec5 prerequisite-patch-id: 60b3fafbd3bfa225405a6762bdb6b89c044b0b86 prerequisite-patch-id: 620068ae417bf0784809107e0dae3ec9793632df prerequisite-patch-id: c3415fe92e29cd4afc508f8caf31cb914be09261 prerequisite-patch-id: 4c01f305244036afa9aaa918c8215659327dd0f3 prerequisite-patch-id: 034aeb7e124c5a34785c963bf014aa5380f00a2e prerequisite-patch-id: 26f18c2ca586e6d734cd319e0e7f24398b17217f prerequisite-patch-id: ef97136efb8c077232fe39a0465389565803a7b7 prerequisite-patch-id: 6a63e03117287b748cfec00e2c16a41ed38f4f9a -- 2.35.0
