On 6/25/25 16:20, Aleksa Paunovic via B4 Relay wrote:
This patch series adds support for the xmipsexectl vendor extension. A new hardware probe key has also been added to allow userspace to probe for MIPS vendor extensions. Additionally, since the standard Zihintpause PAUSE instruction encoding is not supported on some MIPS CPUs, an errata was implemented for replacing this instruction with the xmipsexectl MIPS.PAUSE alternative encoding. Signed-off-by: Aleksa Paunovic <aleksa.paunovic@xxxxxxxxxxxxx> --- This is a continuation of a previous series, which did not implement the full xmipsexectl vendor extension. The title was updated accordingly. Changes in v4: - Add support for the xmipsexectl vendor extension - Remove the ifdef/else from errata_list.h - Replace the ifdef/else with a hwprobe call in the userspace code. Link to v3: https://lore.kernel.org/linux-riscv/20250129131703.733098-1-arikalo@xxxxxxxxx/ --- Aleksa Paunovic (6): dt-bindings: riscv: Add xmipsexectl ISA extension description riscv: Add xmipsexectl as a vendor extension riscv: Add xmipsexectl PAUSE instruction riscv: hwprobe: Add MIPS vendor extension probing riscv: hwprobe: Document MIPS xmipsexectl vendor extension riscv: Add tools support for xmipsexectl Djordje Todorovic (1): riscv: errata: Fix the PAUSE Opcode for MIPS P8700 Documentation/arch/riscv/hwprobe.rst | 9 +++ .../devicetree/bindings/riscv/extensions.yaml | 6 ++ arch/riscv/Kconfig.errata | 23 ++++++++ arch/riscv/Kconfig.vendor | 13 +++++ arch/riscv/errata/Makefile | 1 + arch/riscv/errata/mips/Makefile | 5 ++ arch/riscv/errata/mips/errata.c | 67 ++++++++++++++++++++++ arch/riscv/include/asm/alternative.h | 3 + arch/riscv/include/asm/cmpxchg.h | 3 +- arch/riscv/include/asm/errata_list.h | 17 +++++- arch/riscv/include/asm/hwprobe.h | 3 +- arch/riscv/include/asm/vdso/processor.h | 4 +- arch/riscv/include/asm/vendor_extensions/mips.h | 23 ++++++++ .../include/asm/vendor_extensions/mips_hwprobe.h | 23 ++++++++ arch/riscv/include/asm/vendorid_list.h | 1 + arch/riscv/include/uapi/asm/hwprobe.h | 1 + arch/riscv/include/uapi/asm/vendor/mips.h | 3 + arch/riscv/kernel/alternative.c | 5 ++ arch/riscv/kernel/entry.S | 2 + arch/riscv/kernel/sys_hwprobe.c | 4 ++ arch/riscv/kernel/vendor_extensions.c | 10 ++++ arch/riscv/kernel/vendor_extensions/Makefile | 2 + arch/riscv/kernel/vendor_extensions/mips.c | 22 +++++++ arch/riscv/kernel/vendor_extensions/mips_hwprobe.c | 22 +++++++ arch/riscv/mm/init.c | 1 + tools/arch/riscv/include/asm/vdso/processor.h | 27 +++++---- 26 files changed, 286 insertions(+), 14 deletions(-) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250424-p8700-pause-dcb649968e24 Best regards,
I tried to fix all the small comments I added, but there are quite a few (and using MIPS_PAUSE triggered a new header nightmare) so can you send another version rebased on top of this branch https://git.kernel.org/pub/scm/linux/kernel/git/alexghiti/linux.git/log/?h=alex-for-next ?
Thanks, Alex
