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b=H4sIAGNBp2UC/23QTU7DMBAF4KtUXhM0M/4NK+6BWMT2mHpBUjnIA lW5O05F0whl+Sx/bzy+iplL5lm8nK6icM1znsYW3NNJhPMwfnCXY8uCgCQi2i7xGDh3qU8GonU qDSDa5UvhlL9vRW/vLZ/z/DWVn1tvxfX0r4LoXlGxg85zAIcYPCG9llynOY/hOUyfYm2ptJMSN klNUvCG5ODRYzqQ8iEJ5SblOtNq1I6kY28PpLpLBQjbwlU1GVVIlHwPOsoDqffSbVI3OQzIGqM loqPXmr3sN2maBIVomlVKhwNpdxIff2ubtC6BQcUYPfyTy7L8AiWfKZ37AQAA To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Jonathan Corbet , Conor Dooley , =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Atish Patra , Randy Dunlap , Alexandre Ghiti Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Charlie Jenkins , Atish Patra X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1705460071; l=2486; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=Pat7RCigSa5r0JFjA0wxBgqZn7nz7o/oQLmsEgnHH2c=; b=j+zlsJvLP6gWKyP33srwPabTq27bJGfwwrXSeGvgu7PyZtodOZyZclbdcb5Xf0rPgpm+Ku3Fd e3QfmvR1XObDnJcLkrWu3JZD090iqBz1sSMQcYDA6RcR13e0Wu+Jq5v X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788304534508187313 X-GMAIL-MSGID: 1788304534508187313 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 --- 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@rivosinc.com 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@rivosinc.com Changes in v6: - Fixup documentation formatting - Link to v5: https://lore.kernel.org/r/20240108-fencei-v5-0-aa1e51d7222f@rivosinc.com Changes in v5: - Minor documentation changes (Randy) - Link to v4: https://lore.kernel.org/r/20240107-fencei-v4-0-d4cf2fb905d3@rivosinc.com 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@rivosinc.com 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@rivosinc.com Changes in v2: - Fix kernel-doc comment (Conor) - Link to v1: https://lore.kernel.org/r/20231122-fencei-v1-0-bec0811cb212@rivosinc.com --- 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