Message ID | 20231213-fencei-v3-0-b75158238eb7@rivosinc.com |
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Series |
riscv: Create and document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl
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Message
Charlie Jenkins
Dec. 13, 2023, 10:47 p.m. UTC
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@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 | 98 ++++++++++++++++++++++++++++++++++++++
Documentation/arch/riscv/index.rst | 1 +
arch/riscv/include/asm/mmu.h | 2 +
arch/riscv/include/asm/processor.h | 6 +++
arch/riscv/mm/cacheflush.c | 37 ++++++++++++++
arch/riscv/mm/context.c | 8 ++--
include/uapi/linux/prctl.h | 3 ++
kernel/sys.c | 6 +++
8 files changed, 158 insertions(+), 3 deletions(-)
---
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
change-id: 20231117-fencei-f9f60d784fa0