On Mon, Feb 12, 2024 at 03:36:25PM -0800, Charlie Jenkins wrote: > 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. > > Patch sent to add PR_RISCV_SET_ICACHE_FLUSH_CTX to man-pages [2]. > > [1] https://github.com/riscv/riscv-j-extension > [2] https://lore.kernel.org/linux-man/20240124-fencei_prctl-v1-1-0bddafcef331@xxxxxxxxxxxx > > Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> > --- > Changes in v11: > - Add back PR_RISCV_CTX_SW_FENCEI_OFF (Samuel) > - Fix under nosmp (Samuel) > - Change set_prev_cpu (Samuel) > - Fixup example testcase in docs > - Change wording of documentation slightly (Alejandor Colomar) > - Link to v10: https://lore.kernel.org/r/20240124-fencei-v10-0-a25971f4301d@xxxxxxxxxxxx > > Changes in v10: > - Fix fence.i condition to properly only flush on migration (Alex) > - Fix documentation wording (Alex) > - Link to v9: https://lore.kernel.org/r/20240123-fencei-v9-0-71411bfe8d71@xxxxxxxxxxxx > > Changes in v9: > - Remove prev_cpu from mm (Alex) > - Link to v8: https://lore.kernel.org/r/20240116-fencei-v8-0-43a42134f021@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 (4): > riscv: Remove unnecessary irqflags processor.h include > riscv: Include riscv_set_icache_flush_ctx prctl > documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl > cpumask: Add assign cpu > > Documentation/arch/riscv/cmodx.rst | 98 ++++++++++++++++++++++++++++++++++ > Documentation/arch/riscv/index.rst | 1 + > arch/riscv/include/asm/irqflags.h | 1 - > arch/riscv/include/asm/mmu.h | 2 + > arch/riscv/include/asm/processor.h | 12 +++++ > arch/riscv/include/asm/switch_to.h | 23 ++++++++ > arch/riscv/mm/cacheflush.c | 105 +++++++++++++++++++++++++++++++++++++ > arch/riscv/mm/context.c | 18 +++++-- > include/linux/cpumask.h | 16 ++++++ > include/uapi/linux/prctl.h | 6 +++ > kernel/sys.c | 6 +++ > 11 files changed, 282 insertions(+), 6 deletions(-) > --- > base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d > change-id: 20231117-fencei-f9f60d784fa0 > -- > - Charlie > Copy Samuel Holland on this patch. - Charlie
