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riscv: Include riscv_set_icache_flush_ctx prctl

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Support new prctl with key PR_RISCV_SET_ICACHE_FLUSH_CTX to enable
optimization of cross modifying code. This prctl enables userspace code
to use icache flushing instructions such as fence.i with the guarantee
that the icache will continue to be clean after thread migration.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20240312-fencei-v13-2-4b6bdc2bbf32@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Charlie Jenkins
2024-03-12 16:53:41 -07:00
committed by Palmer Dabbelt
parent bebc345413
commit 6b9391b581
7 changed files with 171 additions and 8 deletions
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6
include/uapi/linux/prctl.h
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@@ -306,4 +306,10 @@ struct prctl_mm_map {
# define PR_RISCV_V_VSTATE_CTRL_NEXT_MASK 0xc
# define PR_RISCV_V_VSTATE_CTRL_MASK 0x1f
#define PR_RISCV_SET_ICACHE_FLUSH_CTX 71
# define PR_RISCV_CTX_SW_FENCEI_ON 0
# define PR_RISCV_CTX_SW_FENCEI_OFF 1
# define PR_RISCV_SCOPE_PER_PROCESS 0
# define PR_RISCV_SCOPE_PER_THREAD 1
#endif /* _LINUX_PRCTL_H */