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@htecgroup.com>
> ---
> 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@gmail.com/
>
> ---
> 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