Improve the performance of icache flushing by creating a new prctl flag PR_RISCV_SET_ICACHE_FLUSH_CTX. The interface is left generic to allow for future expansions such as with the proposed J extension [1]. Documentation is also provided to explain the use case. [1] https://github.com/riscv/riscv-j-extension Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> --- Changes in v8: - Only flush icache if migrated to different cpu (Alex) - Move flushing to switch_to to catch per-thread flushing properly - Link to v7: https://lore.kernel.org/r/20240112-fencei-v7-0-78f0614e1db0@xxxxxxxxxxxx Changes in v7: - Change "per_thread" parameter to "scope" and provide constants for the parameter. - Link to v6: https://lore.kernel.org/r/20240109-fencei-v6-0-04116e51445c@xxxxxxxxxxxx Changes in v6: - Fixup documentation formatting - Link to v5: https://lore.kernel.org/r/20240108-fencei-v5-0-aa1e51d7222f@xxxxxxxxxxxx Changes in v5: - Minor documentation changes (Randy) - Link to v4: https://lore.kernel.org/r/20240107-fencei-v4-0-d4cf2fb905d3@xxxxxxxxxxxx Changes in v4: - Add OFF flag to disallow fence.i in userspace (Atish) - Fix documentation issues (Atish) - Link to v3: https://lore.kernel.org/r/20231213-fencei-v3-0-b75158238eb7@xxxxxxxxxxxx Changes in v3: - Check if value force_icache_flush set on thread, rather than in mm twice (Clément) - Link to v2: https://lore.kernel.org/r/20231130-fencei-v2-0-2cb623ab1b1f@xxxxxxxxxxxx Changes in v2: - Fix kernel-doc comment (Conor) - Link to v1: https://lore.kernel.org/r/20231122-fencei-v1-0-bec0811cb212@xxxxxxxxxxxx --- Charlie Jenkins (2): riscv: Include riscv_set_icache_flush_ctx prctl documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl Documentation/arch/riscv/cmodx.rst | 96 ++++++++++++++++++++++++++++++++++++ Documentation/arch/riscv/index.rst | 1 + arch/riscv/include/asm/mmu.h | 4 ++ arch/riscv/include/asm/mmu_context.h | 3 ++ arch/riscv/include/asm/processor.h | 7 +++ arch/riscv/include/asm/switch_to.h | 17 +++++++ arch/riscv/mm/cacheflush.c | 67 +++++++++++++++++++++++++ arch/riscv/mm/context.c | 14 ++++-- include/uapi/linux/prctl.h | 6 +++ kernel/sys.c | 6 +++ 10 files changed, 218 insertions(+), 3 deletions(-) --- base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86 change-id: 20231117-fencei-f9f60d784fa0 -- - Charlie
