linux-kernel - [PATCH v2 2/4] riscv: hwprobe: Report Zicbop presence and block size

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Message-ID: <20251009134318.23040-3-zihong.plct@isrc.iscas.ac.cn>
Date: Thu,  9 Oct 2025 21:41:52 +0800
From: Yao Zihong <zihong.plct@...c.iscas.ac.cn>
To: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: ajones@...tanamicro.com,
	alexghiti@...osinc.com,
	shuah@...nel.org,
	samuel.holland@...ive.com,
	evan@...osinc.com,
	cleger@...osinc.com,
	zihong.plct@...c.iscas.ac.cn,
	zihongyao@...look.com,
	zhangyin2018@...as.ac.cn,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Charlie Jenkins <charlie@...osinc.com>,
	Jesse Taube <jesse@...osinc.com>,
	Inochi Amaoto <inochiama@...il.com>,
	Aleksa Paunovic <aleksa.paunovic@...cgroup.com>,
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Yunhui Cui <cuiyunhui@...edance.com>,
	Nam Cao <namcao@...utronix.de>
Subject: [PATCH v2 2/4] riscv: hwprobe: Report Zicbop presence and block size

Plumb Zicbop into hwprobe. Semantics mirror Zicbom/Zicboz to keep
userspace expectations aligned.

Signed-off-by: Yao Zihong <zihong.plct@...c.iscas.ac.cn>
---
 arch/riscv/kernel/sys_hwprobe.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
index 000f4451a9d8..7a6ae1327504 100644
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -113,6 +113,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZCB);
 		EXT_KEY(ZCMOP);
 		EXT_KEY(ZICBOM);
+		EXT_KEY(ZICBOP);
 		EXT_KEY(ZICBOZ);
 		EXT_KEY(ZICNTR);
 		EXT_KEY(ZICOND);
@@ -293,6 +294,11 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
 		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOM))
 			pair->value = riscv_cbom_block_size;
 		break;
+	case RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE:
+		pair->value = 0;
+		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOP))
+			pair->value = riscv_cbop_block_size;
+		break;
 	case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
 		pair->value = user_max_virt_addr();
 		break;
-- 
2.47.2