This change detects the presence of Zba, Zbb, and Zbs extensions and exports
them per-hart to userspace via the hwprobe mechanism. Glibc can then use
these in setting up hwcaps-based library search paths.
There's a little bit of extra housekeeping here: the first change adds
Zba and Zbs to the set of extensions the kernel recognizes, and the second
change starts tracking ISA features per-hart (in addition to the ANDed
mask of features across all harts which the kernel uses to make
decisions). Now that we track the ISA information per-hart, we could
even fix up /proc/cpuinfo to accurately report extension per-hart,
though I've left that out of this series for now.
Changes in v2:
- Add Zbs as well
- Add blank line before if in riscv_fill_hwcap() (Conor)
- Fixed typo s/supporte/supported/ (Conor)
- Fixed copypasta s/IMA_ZBB/EXT_ZBB/ (Conor)
- Added Zbs
Evan Green (3):
RISC-V: Add Zba, Zbs extension probing
RISC-V: Track ISA extensions per hart
RISC-V: hwprobe: Expose Zba, Zbb, and Zbs
Documentation/riscv/hwprobe.rst | 10 ++++++
arch/riscv/include/asm/cpufeature.h | 10 ++++++
arch/riscv/include/asm/hwcap.h | 2 ++
arch/riscv/include/uapi/asm/hwprobe.h | 3 ++
arch/riscv/kernel/cpu.c | 2 ++
arch/riscv/kernel/cpufeature.c | 20 +++++++----
arch/riscv/kernel/sys_riscv.c | 48 +++++++++++++++++++++++----
7 files changed, 82 insertions(+), 13 deletions(-)
--
2.25.1
On Tue, 09 May 2023 11:25:00 -0700, Evan Green wrote:
> This change detects the presence of Zba, Zbb, and Zbs extensions and exports
> them per-hart to userspace via the hwprobe mechanism. Glibc can then use
> these in setting up hwcaps-based library search paths.
>
> There's a little bit of extra housekeeping here: the first change adds
> Zba and Zbs to the set of extensions the kernel recognizes, and the second
> change starts tracking ISA features per-hart (in addition to the ANDed
> mask of features across all harts which the kernel uses to make
> decisions). Now that we track the ISA information per-hart, we could
> even fix up /proc/cpuinfo to accurately report extension per-hart,
> though I've left that out of this series for now.
>
> [...]
Applied, thanks!
[1/3] RISC-V: Add Zba, Zbs extension probing
https://git.kernel.org/palmer/c/c6699baf1064
[2/3] RISC-V: Track ISA extensions per hart
https://git.kernel.org/palmer/c/82e9c66e81c8
[3/3] RISC-V: hwprobe: Expose Zba, Zbb, and Zbs
https://git.kernel.org/palmer/c/c0baf321038d
Best regards,
--
Palmer Dabbelt <[email protected]>
Hello:
This series was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <[email protected]>:
On Tue, 9 May 2023 11:25:00 -0700 you wrote:
> This change detects the presence of Zba, Zbb, and Zbs extensions and exports
> them per-hart to userspace via the hwprobe mechanism. Glibc can then use
> these in setting up hwcaps-based library search paths.
>
> There's a little bit of extra housekeeping here: the first change adds
> Zba and Zbs to the set of extensions the kernel recognizes, and the second
> change starts tracking ISA features per-hart (in addition to the ANDed
> mask of features across all harts which the kernel uses to make
> decisions). Now that we track the ISA information per-hart, we could
> even fix up /proc/cpuinfo to accurately report extension per-hart,
> though I've left that out of this series for now.
>
> [...]
Here is the summary with links:
- [v2,1/3] RISC-V: Add Zba, Zbs extension probing
https://git.kernel.org/riscv/c/c6699baf1064
- [v2,2/3] RISC-V: Track ISA extensions per hart
https://git.kernel.org/riscv/c/82e9c66e81c8
- [v2,3/3] RISC-V: hwprobe: Expose Zba, Zbb, and Zbs
https://git.kernel.org/riscv/c/c0baf321038d
You are awesome, thank you!
--
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