[PATCH v11 0/3] riscv, mm: detect svnapot cpu support at runtime
Qinglin Pan
panqinglin2020 at iscas.ac.cn
Fri Jan 13 20:54:45 PST 2023
Hi Palmer,
a friendly ping?
Thanks,
Qinglin
On 2022/12/16 14:21, panqinglin2020 at iscas.ac.cn wrote:
> From: Qinglin Pan <panqinglin2020 at iscas.ac.cn>
>
> Svnapot is a RISC-V extension for marking contiguous 4K pages as a non-4K
> page. This patch set is for using Svnapot in hugetlb fs and huge vmap.
>
> This patchset adds a Kconfig item for using Svnapot in
> "Platform type"->"SVNAPOT extension support". Its default value is on,
> and people can set it off if they don't allow kernel to detect Svnapot
> hardware support and leverage it.
>
> Tested on:
> - qemu rv64 with "Svnapot support" off and svnapot=true.
> - qemu rv64 with "Svnapot support" on and svnapot=true.
> - qemu rv64 with "Svnapot support" off and svnapot=false.
> - qemu rv64 with "Svnapot support" on and svnapot=false.
>
>
> Changes in v2:
> - detect Svnapot hardware support at boot time.
> Changes in v3:
> - do linear mapping again if has_svnapot
> Changes in v4:
> - fix some errors/warns reported by checkpatch.pl, thanks @Conor
> Changes in v5:
> - modify code according to @Conor and @Heiko
> Changes in v6:
> - use static key insead of alternative errata
> Changes in v7:
> - add napot_cont_order for possible more napot order in the future
> - remove linear mapping related code from this patchset to another patch
> - refactor hugetlb code for svnapot according to thanks @Andrew @Conor
> - use tools/testing/selftests/vm/map_hugetlb as hugetlb testing program
> - support svnapot in huge vmap on newer for-next branch
> Changes in v8:
> - fix compilation errors in rv32_defconfig
> - insert some lines of whitespace according to @Conor's suggestion
> Changes in v9:
> - use alternative to avoid using static branches inside heavily used
> inline functions
> - change napot_cont_mask definition
> - post test_vmalloc modification about testing vmalloc_huge
> Changes in v10:
> - fix some nits caught by @Andrew
> - collect Reviewed-by/Acked-by
> - add memory leak warning in KConfig text
> - replace test_vmalloc patch link with the standard one
> Changes in v11:
> - add more detailed warning about HUGETLBFS and SVNAPOT in KConfig text
> - fix missing reverse-xmas tree
>
>
> Qinglin Pan (3):
> riscv: mm: modify pte format for Svnapot
> riscv: mm: support Svnapot in hugetlb page
> riscv: mm: support Svnapot in huge vmap
>
> arch/riscv/Kconfig | 21 +-
> arch/riscv/include/asm/errata_list.h | 15 +-
> arch/riscv/include/asm/hugetlb.h | 34 ++-
> arch/riscv/include/asm/hwcap.h | 2 +-
> arch/riscv/include/asm/page.h | 5 -
> arch/riscv/include/asm/pgtable-64.h | 34 +++
> arch/riscv/include/asm/pgtable.h | 43 +++-
> arch/riscv/include/asm/vmalloc.h | 61 +++++-
> arch/riscv/kernel/cpu.c | 1 +
> arch/riscv/kernel/cpufeature.c | 15 ++
> arch/riscv/mm/hugetlbpage.c | 301 +++++++++++++++++++++++++++
> 11 files changed, 519 insertions(+), 13 deletions(-)
>
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