From: Charlie Jenkins <charlie@rivosinc.com>
To: "Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Jonathan Corbet" <corbet@lwn.net>,
"Conor Dooley" <conor.dooley@microchip.com>,
"Clément Léger" <cleger@rivosinc.com>,
"Atish Patra" <atishp@atishpatra.org>,
"Randy Dunlap" <rdunlap@infradead.org>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org,
Charlie Jenkins <charlie@rivosinc.com>,
Atish Patra <atishp@rivosinc.com>
Subject: [PATCH v7 0/2] riscv: Create and document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl
Date: Fri, 12 Jan 2024 15:56:19 -0800 [thread overview]
Message-ID: <20240112-fencei-v7-0-78f0614e1db0@rivosinc.com> (raw)
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 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 | 88 ++++++++++++++++++++++++++++++++++++++
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 | 67 +++++++++++++++++++++++++++++
arch/riscv/mm/context.c | 8 ++--
include/uapi/linux/prctl.h | 6 +++
kernel/sys.c | 6 +++
8 files changed, 181 insertions(+), 3 deletions(-)
---
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
change-id: 20231117-fencei-f9f60d784fa0
--
- Charlie
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next reply other threads:[~2024-01-12 23:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-12 23:56 Charlie Jenkins [this message]
2024-01-12 23:56 ` [PATCH v7 1/2] riscv: Include riscv_set_icache_flush_ctx prctl Charlie Jenkins
2024-01-14 16:05 ` Alexandre Ghiti
2024-01-16 18:45 ` Charlie Jenkins
2024-01-12 23:56 ` [PATCH v7 2/2] documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl Charlie Jenkins
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