Hey, Based on my latest iteration of deprecating riscv,isa [1], here's an implementation of the new properties for Linux. The first few patches, up to "RISC-V: split riscv_fill_hwcap() in 3", are all prep work that further tames some of the extension related code, on top of my already applied series that cleans up the ISA string parser. Perhaps "RISC-V: shunt isa_ext_arr to cpufeature.c" is a bit gratuitous, but I figured a bit of coalescing of extension related data structures would be a good idea. Note that riscv,isa will still be used in the absence of the new properties. Palmer suggested adding a Kconfig option to turn off the fallback for DT, which I have gone and done. It's locked behind the NONPORTABLE option for good reason. In v2, I've also come up with a more reasonable name for the new function I added & fixed up various comments from Drew and Evan. In v3, there's the new commandline option that Drew suggested. I have Also picked up a patch from Palmer that adds more helpful prints where harts fail the checks in riscv_early_of_processor_id(), and I've sprinkled a few more of those prints in my new additions to the function. Cheers, Conor. [1] https://lore.kernel.org/all/20230702-eats-scorebook-c951f170d29f@spud CC: Rob Herring <robh+dt@xxxxxxxxxx> CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx> CC: Paul Walmsley <paul.walmsley@xxxxxxxxxx> CC: Palmer Dabbelt <palmer@xxxxxxxxxxx> CC: Albert Ou <aou@xxxxxxxxxxxxxxxxx> CC: Jonathan Corbet <corbet@xxxxxxx> CC: Andrew Jones <ajones@xxxxxxxxxxxxxxxx> CC: Heiko Stuebner <heiko.stuebner@xxxxxxxx> CC: Evan Green <evan@xxxxxxxxxxxx> CC: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx> CC: linux-doc@xxxxxxxxxxxxxxx CC: linux-riscv@xxxxxxxxxxxxxxxxxxx CC: devicetree@xxxxxxxxxxxxxxx CC: linux-kernel@xxxxxxxxxxxxxxx Conor Dooley (9): RISC-V: drop a needless check in print_isa_ext() RISC-V: shunt isa_ext_arr to cpufeature.c RISC-V: repurpose riscv_isa_ext array in riscv_fill_hwcap() RISC-V: add missing single letter extension definitions RISC-V: add single letter extensions to riscv_isa_ext RISC-V: split riscv_fill_hwcap() in 3 RISC-V: enable extension detection from new properties RISC-V: try new extension properties in of_early_processor_hartid() RISC-V: provide Kconfig & commandline options to control parsing "riscv,isa" Heiko Stuebner (1): RISC-V: don't parse dt/acpi isa string to get rv32/rv64 Palmer Dabbelt (1): RISC-V: Provide a more helpful error message on invalid ISA strings .../admin-guide/kernel-parameters.txt | 7 + arch/riscv/Kconfig | 18 + arch/riscv/include/asm/hwcap.h | 17 +- arch/riscv/kernel/cpu.c | 177 ++---- arch/riscv/kernel/cpufeature.c | 519 ++++++++++++------ 5 files changed, 436 insertions(+), 302 deletions(-) -- 2.40.1
