[PATCH v13 0/4] riscv: Create and document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl

[Charlie Jenkins]

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@rivosinc.com

Signed-off-by: Charlie Jenkins <charlie at rivosinc.com>
---
Changes in v13:
- Properly unset thread.force_icache_flush (Samuel)
- Add ctx value checking when SMP=n (Samuel)
- Remove duplicate bit set (Samuel)
- Link to v12: https://lore.kernel.org/r/20240312-fencei-v12-0-0f340f004ce7@rivosinc.com

Changes in v12:
- Use context.icache_stale_mask instead of thread.icache_stale_mask in
  PR_RISCV_CTX_SW_FENCEI_OFF (Samuel)
- Link to v11: https://lore.kernel.org/r/20240212-fencei-v11-0-e1327f25fe10@rivosinc.com

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@rivosinc.com

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@rivosinc.com

Changes in v9:
- Remove prev_cpu from mm (Alex)
- Link to v8: https://lore.kernel.org/r/20240116-fencei-v8-0-43a42134f021@rivosinc.com

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 (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 |  10 ++++
 arch/riscv/include/asm/switch_to.h |  23 ++++++++
 arch/riscv/mm/cacheflush.c         | 111 +++++++++++++++++++++++++++++++++++++
 arch/riscv/mm/context.c            |  19 ++++---
 include/linux/cpumask.h            |  16 ++++++
 include/uapi/linux/prctl.h         |   6 ++
 kernel/sys.c                       |   6 ++
 11 files changed, 284 insertions(+), 9 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20231117-fencei-f9f60d784fa0
-- 
- Charlie