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Add support arena atomics for RV64 #9329

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Pull request for series with
subject: Add support arena atomics for RV64
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958

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Upstream branch: 42be23e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: 42be23e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: 42be23e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: 95993dc
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: 9ea0691
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: b7b3500
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: b114fce
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

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Upstream branch: e9f545d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

Pu Lehui added 2 commits July 27, 2025 10:29
riscv, bpf: Extract emit_stx() helper
13d41ca 
There's a lot of redundant code related to store from register
operations, let's extract emit_stx() to make code more compact.

Signed-off-by: Pu Lehui <[email protected]>
riscv, bpf: Extract emit_st() helper
496fc46 
There's a lot of redundant code related to store from immediate
operations, let's extract emit_st() to make code more compact.

Signed-off-by: Pu Lehui <[email protected]>
Pu Lehui added 2 commits July 27, 2025 10:29
riscv, bpf: Extract emit_ldx() helper
0244f6d 
There's a lot of redundant code related to load into register
operations, let's extract emit_ldx() to make code more compact.

Signed-off-by: Pu Lehui <[email protected]>
riscv: Separate toolchain support dependency from RISCV_ISA_ZACAS
1b5aae8 
RV64 bpf is going to support ZACAS instructions. Let's separate
toolchain support dependency from RISCV_ISA_ZACAS.

Signed-off-by: Pu Lehui <[email protected]>
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Upstream branch: 5345e64
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983958
version: 1

Pu Lehui added 6 commits July 27, 2025 10:29
riscv, bpf: Add rv_ext_enabled macro for runtime detection extentsion
2874283 
Add rv_ext_enabled macro to check whether the runtime detection
extension is enabled.

Signed-off-by: Pu Lehui <[email protected]>
riscv, bpf: Add Zacas instructions
db60a3c 
Add Zacas instructions introduced by [0] to reduce code size and
improve performance of RV64 JIT.

Link: https://github.com/riscvarchive/riscv-zacas/releases/download/v1.0/riscv-zacas.pdf [0]
Signed-off-by: Pu Lehui <[email protected]>
riscv, bpf: Optimize cmpxchg insn with Zacas support
0cb8d72 
Optimize cmpxchg instruction with amocas.w and amocas.d
Zacas instructions.

Signed-off-by: Pu Lehui <[email protected]>
riscv, bpf: Add ex_insn_off and ex_jmp_off for exception table handling
072954a 
Add ex_insn_off and ex_jmp_off fields to struct rv_jit_context so that
add_exception_handler() does not need to be immediately followed by the
instruction to add the exception table. ex_insn_off indicates the offset
of the instruction to add the exception table, and ex_jmp_off indicates
the offset to jump over the faulting instruction. This is to prepare for
adding the exception table to atomic instructions later, because some
atomic instructions need to perform zext or other operations.

Signed-off-by: Pu Lehui <[email protected]>
riscv, bpf: Add support arena atomics for RV64
9e7871f 
Add arena atomics support for RMW atomics and load-acquire and
store-release instructions. Non-Zacas cmpxchg is implemented via loop,
which is not currently supported because it requires more complex
extable and loop logic.

Signed-off-by: Pu Lehui <[email protected]>
selftests/bpf: Enable arena atomics tests for RV64
3a96cc1 
Enable arena atomics tests for RV64.

Signed-off-by: Pu Lehui <[email protected]>
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