From nobody Tue Dec 16 06:22:40 2025 Received: from out-181.mta1.migadu.com (out-181.mta1.migadu.com [95.215.58.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A2872E7F17 for ; Mon, 15 Dec 2025 08:12:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765786324; cv=none; b=rEuvTFLXl+mwk8A1KCMsnt1ru+dSTQi8wW3m6iHW2zCgs0P+bBniMvBXco8WeHO0j346LGL3YGtLTRSydqGwCgBL2fDYYmOXLMFIFl4/BZ3mxdB+5GugOxfoS1b6+qST/hSa+yJw1ra7oTtLKL0ld4/994lPx3+SFkLbbpY5Zts= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765786324; c=relaxed/simple; bh=cXc3obyIcw9YvkeOmzuL/bv4CnWdw8pFi4uXyVWqX4c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=hNlAaJqslowC6NPe91FR22QEbS2uyAM0X/7l/A4AsHc4bQCecjghZtHy40/ng/KRRumenyqFtPxdVeQfU8Np78G3eAlNmKGnlmKYmB+Mo42MhqN4XBepGTLCQmTsPGZdQU8aIwOsoE2ufxPBHfbgta8ZGTAIGe6X25MoUyvTaU4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=YPHPN1fv; arc=none smtp.client-ip=95.215.58.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="YPHPN1fv" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1765786319; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OoRCdow/Ti3N0HxisM491xXoQW8jb0KI8KhOldrmjGg=; b=YPHPN1fvwtk449VtEp3a9wb1ZutBKh3ci5qgGicmulBPJlJNN5Wg9PNeE1gosyho8hKyG5 FEPdVqo7nwQnyrXhYmTj75g85/HCSKscqALZ23YKZEFVhSyS9uXScf0/cXUpx9dwWLM/G6 PjjIOkH3b8QJL+5pwmg6BQNWnhqAKO8= From: George Guo Date: Mon, 15 Dec 2025 16:11:39 +0800 Subject: [PATCH v6 1/4] LoongArch: Add SCQ support detection Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251215-2-v6-1-c3ceeb281916@linux.dev> References: <20251215-2-v6-0-c3ceeb281916@linux.dev> In-Reply-To: <20251215-2-v6-0-c3ceeb281916@linux.dev> To: Huacai Chen , WANG Xuerui , hengqi.chen@gmail.com Cc: r@hev.cc, xry111@xry111.site, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, George Guo , George Guo , Yangyang Lian X-Developer-Signature: v=1; a=ed25519-sha256; t=1765786312; l=3909; i=dongtai.guo@linux.dev; s=20251103; h=from:subject:message-id; bh=yhUOO3j3lnIAbGqoY3X9QA4Vqj6Mmpm4lGexeO4WKBg=; b=P/8HzRI+lNDEHfg7S0Q+zzNlCXx8bOJhitCa2/V5VT0iBBOiv4Se+SY7F6lmYWZKC1uSXJUwy A1KE3iKV4ocAlgb32+siWi8AGjoqYJxc0BnIHRTvtN7/jh/Kpt2iYGE X-Developer-Key: i=dongtai.guo@linux.dev; a=ed25519; pk=yHUJPGx/kAXutP/NSHpj7hWW0KQNlv3w9H6ju4qUoTM= X-Migadu-Flow: FLOW_OUT From: George Guo Check CPUCFG2_SCQ bit to determin if the CPU supports SCQ instrction. Co-developed-by: Yangyang Lian Signed-off-by: Yangyang Lian Signed-off-by: George Guo --- arch/loongarch/include/asm/cpu-features.h | 1 + arch/loongarch/include/asm/cpu.h | 2 ++ arch/loongarch/include/asm/loongarch.h | 1 + arch/loongarch/kernel/cpu-probe.c | 2 ++ arch/loongarch/kernel/proc.c | 1 + 5 files changed, 7 insertions(+) diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/inc= lude/asm/cpu-features.h index bd5f0457ad21d89ab902fb1971cc8b41b1d340ad..860cb58a92ba0c0316a8009d974= 41043374e7f10 100644 --- a/arch/loongarch/include/asm/cpu-features.h +++ b/arch/loongarch/include/asm/cpu-features.h @@ -70,5 +70,6 @@ #define cpu_has_msgint cpu_opt(LOONGARCH_CPU_MSGINT) #define cpu_has_avecint cpu_opt(LOONGARCH_CPU_AVECINT) #define cpu_has_redirectint cpu_opt(LOONGARCH_CPU_REDIRECTINT) +#define cpu_has_scq cpu_opt(LOONGARCH_CPU_SCQ) =20 #endif /* __ASM_CPU_FEATURES_H */ diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/= cpu.h index f3efb00b61414a9b111ade9fe9beb410b927d937..5531039027ec763f21c7a6a8868= 5ec81fa61d3cc 100644 --- a/arch/loongarch/include/asm/cpu.h +++ b/arch/loongarch/include/asm/cpu.h @@ -125,6 +125,7 @@ static inline char *id_to_core_name(unsigned int id) #define CPU_FEATURE_MSGINT 29 /* CPU has MSG interrupt */ #define CPU_FEATURE_AVECINT 30 /* CPU has AVEC interrupt */ #define CPU_FEATURE_REDIRECTINT 31 /* CPU has interrupt remapping */ +#define CPU_FEATURE_SCQ 32 /* CPU has SC.Q instruction */ =20 #define LOONGARCH_CPU_CPUCFG BIT_ULL(CPU_FEATURE_CPUCFG) #define LOONGARCH_CPU_LAM BIT_ULL(CPU_FEATURE_LAM) @@ -158,5 +159,6 @@ static inline char *id_to_core_name(unsigned int id) #define LOONGARCH_CPU_MSGINT BIT_ULL(CPU_FEATURE_MSGINT) #define LOONGARCH_CPU_AVECINT BIT_ULL(CPU_FEATURE_AVECINT) #define LOONGARCH_CPU_REDIRECTINT BIT_ULL(CPU_FEATURE_REDIRECTINT) +#define LOONGARCH_CPU_SCQ BIT_ULL(CPU_FEATURE_SCQ) =20 #endif /* _ASM_CPU_H */ diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/includ= e/asm/loongarch.h index 3de03cb864b248cd0fb5de9ec5a86b1436ccbdef..be04b3e6f5b0cd6c5d561efcfd9= 9502bc24e5eee 100644 --- a/arch/loongarch/include/asm/loongarch.h +++ b/arch/loongarch/include/asm/loongarch.h @@ -94,6 +94,7 @@ #define CPUCFG2_LSPW BIT(21) #define CPUCFG2_LAM BIT(22) #define CPUCFG2_PTW BIT(24) +#define CPUCFG2_SCQ BIT(30) =20 #define LOONGARCH_CPUCFG3 0x3 #define CPUCFG3_CCDMA BIT(0) diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-= probe.c index a2060a24b39fd78fa255816fa5518e0ee99b8a8e..5c5ead3eb0895c1a20abba1e19f= 02226a2657b1f 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -201,6 +201,8 @@ static void cpu_probe_common(struct cpuinfo_loongarch *= c) c->options |=3D LOONGARCH_CPU_PTW; elf_hwcap |=3D HWCAP_LOONGARCH_PTW; } + if (config & CPUCFG2_SCQ) + c->options |=3D LOONGARCH_CPU_SCQ; if (config & CPUCFG2_LSPW) { c->options |=3D LOONGARCH_CPU_LSPW; elf_hwcap |=3D HWCAP_LOONGARCH_LSPW; diff --git a/arch/loongarch/kernel/proc.c b/arch/loongarch/kernel/proc.c index 63d2b7e7e844b0647a3e0d988ec2adb6c77b9b14..adfe8a1e3c9dad047bad197bab9= 9fe87ca58b098 100644 --- a/arch/loongarch/kernel/proc.c +++ b/arch/loongarch/kernel/proc.c @@ -75,6 +75,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) if (cpu_has_lbt_x86) seq_printf(m, " lbt_x86"); if (cpu_has_lbt_arm) seq_printf(m, " lbt_arm"); if (cpu_has_lbt_mips) seq_printf(m, " lbt_mips"); + if (cpu_has_scq) seq_printf(m, " scp"); seq_printf(m, "\n"); =20 seq_printf(m, "Hardware Watchpoint\t: %s", str_yes_no(cpu_has_watch)); --=20 2.49.0