From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-188.mta0.migadu.com (out-188.mta0.migadu.com [91.218.175.188]) (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 1904A224AE8 for ; Fri, 12 Dec 2025 03:55:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765511753; cv=none; b=JlG71P28txuhLsfcxb9PuIOCgUmFzms4izmgRb/0KaNL1wm+o/BJeKb4bjjPRbxvB1k+K/dkqcKJfwLOXKuz99R5348PbSp2ZeEwyYX9LRYOTLmM2CyA4HQlXPgOPr3u1wzkUQdDBKlo3Tz0O5++9rZbUG+a1NukhfkYkTnyp5c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765511753; c=relaxed/simple; bh=+BqLR3/i8/FdiIqdrzF+jBGnkYRMM7cabAiMqCdxGAU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=YFa+xjLLvnygDX0/cBpjTfQJltRzWWcyprGgNmr0xM3luWI3yuI1qNvtaawlhfyzqVkSMB8wJydl+y7RapGnBFc7uFm6YhmnnEyFB+xTR1MSFwmMGVVi+yVn5KM/3ff67qNe0yNlrgcCdghh0uM8P1pbp/XTjyOmEgH1ZsqqFOQ= 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=PC8EOnzq; arc=none smtp.client-ip=91.218.175.188 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="PC8EOnzq" 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=1765511748; 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=2NV8ZwW83bzQy1RCyaUHPf+vApGHTLwEI1D2JJxit8E=; b=PC8EOnzqj+anUY7Z3+zZQdFdz/PsDi4AzyiszqiqTWzjQZmI4Q2rSa3B3M2eAtw9+QYMV7 FyaenA84qwMB6ykQz+OexY6WxcQ6ft7xSGjA1Sgb4IezIvnO+u6HYAg8VAhrdy7unkziRp /g9nLRHqx+8o9OAjj96S1y0w4fm2cxY= From: George Guo Date: Fri, 12 Dec 2025 11:55:21 +0800 Subject: [PATCH v5 1/4] LoongArch: Add SCQ support detection Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251212-2-v5-1-704b3af55f7d@linux.dev> References: <20251212-2-v5-0-704b3af55f7d@linux.dev> In-Reply-To: <20251212-2-v5-0-704b3af55f7d@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=1765511741; l=3297; i=dongtai.guo@linux.dev; s=20251103; h=from:subject:message-id; bh=asp3zEGHKQM1Bn/cuBBd7v6/IsNBRe16HsbU8xem4UU=; b=uOvtcHHCxtaO2sSwHFKirjMXKmFZcUUzS9StAcaR2q+L25+rYTDy1aWcSoPneKjW/QBZ8oy6u I/n9cOdikGJCHhuncgYWhsoj3TltXRqIhIL/6gS1NeWc3phMu4vZNNz 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 | 4 ++++ 4 files changed, 8 insertions(+) diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h index bd5f0457ad21d89ab902fb1971cc8b41b1d340ad..860cb58a92ba0c0316a8009d97441043374e7f10 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) #endif /* __ASM_CPU_FEATURES_H */ diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/cpu.h index f3efb00b61414a9b111ade9fe9beb410b927d937..5531039027ec763f21c7a6a88685ec81fa61d3cc 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 */ #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) #endif /* _ASM_CPU_H */ diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h index 3de03cb864b248cd0fb5de9ec5a86b1436ccbdef..be04b3e6f5b0cd6c5d561efcfd99502bc24e5eee 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) #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..47815a55b7b48bbffd4954a9b8bdf7021d7e234d 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -201,6 +201,10 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c) c->options |= LOONGARCH_CPU_PTW; elf_hwcap |= HWCAP_LOONGARCH_PTW; } + if (config & CPUCFG2_SCQ) + c->options |= LOONGARCH_CPU_SCQ; + else + pr_warn_once("CPU does NOT support SCQ\n"); if (config & CPUCFG2_LSPW) { c->options |= LOONGARCH_CPU_LSPW; elf_hwcap |= HWCAP_LOONGARCH_LSPW; -- 2.49.0