linux-kernel - [PATCH bpf-next 06/10] riscv, bpf: Add Zacas instructions

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Message-Id: <20250719091730.2660197-7-pulehui@huaweicloud.com>
Date: Sat, 19 Jul 2025 09:17:26 +0000
From: Pu Lehui <pulehui@...weicloud.com>
To: bpf@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Björn Töpel <bjorn@...nel.org>,
	Puranjay Mohan <puranjay@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Pu Lehui <pulehui@...wei.com>
Subject: [PATCH bpf-next 06/10] riscv, bpf: Add Zacas instructions

From: Pu Lehui <pulehui@...wei.com>

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 <pulehui@...wei.com>
---
 arch/riscv/net/bpf_jit.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/net/bpf_jit.h b/arch/riscv/net/bpf_jit.h
index 0964df48c25e..2351fba5d3e7 100644
--- a/arch/riscv/net/bpf_jit.h
+++ b/arch/riscv/net/bpf_jit.h
@@ -751,6 +751,17 @@ static inline u16 rvc_swsp(u32 imm8, u8 rs2)
 	return rv_css_insn(0x6, imm, rs2, 0x2);
 }
 
+/* RVZACAS instructions. */
+static inline u32 rvzacas_amocas_w(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl)
+{
+	return rv_amo_insn(0x5, aq, rl, rs2, rs1, 2, rd, 0x2f);
+}
+
+static inline u32 rvzacas_amocas_d(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl)
+{
+	return rv_amo_insn(0x5, aq, rl, rs2, rs1, 3, rd, 0x2f);
+}
+
 /* RVZBA instructions. */
 static inline u32 rvzba_sh2add(u8 rd, u8 rs1, u8 rs2)
 {
-- 
2.34.1