From patchwork Thu Sep 26 06:54:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nick Hu X-Patchwork-Id: 13812891 Received: from mail-ot1-f46.google.com (mail-ot1-f46.google.com [209.85.210.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E11718950D for ; Thu, 26 Sep 2024 06:55:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.46 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727333745; cv=none; b=ZwV09pgyzgRlv7sNKxKUB0ohw11D0J51ZuRxoNYcPCYNoYT7DHL6X2YiXyK+ieet9Tl28IWGYLjbtOq5vCTPbPTH72D838lH33/kZBXtEozynj5l2fEq+oDWLaA++/m4beICu/47vE5YH5B/XR9buZHlZhoT96kRiFaZEOPOdCk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727333745; c=relaxed/simple; bh=V5qAw7P+eqzi/1Duiuys4SRbwKIjG57n1EAbl6sKbjA=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=bTz1OinnL35BbkMiSDDbt0mwB4r1p0wWhf9jvl4sGVhdku5zxWCfmayPll1Rhs18bJQrZS0AA8sxwRsB9uYt+1ASdCe0zWieUcts3g3YMeZhJ7v9OeTlxxqs43CaguTBcuS1qMmdWSR5Dw79IK4qNi6EeWTCetMpKW6o1Ox08eI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=sifive.com; spf=pass smtp.mailfrom=sifive.com; dkim=pass (2048-bit key) header.d=sifive.com header.i=@sifive.com header.b=R+wIwy0B; arc=none smtp.client-ip=209.85.210.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=sifive.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sifive.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sifive.com header.i=@sifive.com header.b="R+wIwy0B" Received: by mail-ot1-f46.google.com with SMTP id 46e09a7af769-71100987d1cso364643a34.2 for ; Wed, 25 Sep 2024 23:55:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1727333743; x=1727938543; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=MzHfWrObFTebylfAMReMmx0H/fNyKd6EWjjqrhs5YS8=; b=R+wIwy0BqFZfZ1ot5/7EyBWZ8e1cxDQ3kUYDN+jU6e1K+oKi1rKeSvnhwlcF00/C9r MN9hJJbxH2ETUhzUJyaoMhxTnq8N5FbaFloE6mCw7yryW3y/Vji/quSRtqNllJMIQto0 jWWHPPLa+O3BZiyDYmxBQpz94pzIJx07LudcOy6mqkf+5T4Clk8SpFBSy1TKuKfz63v7 7B7u+BMyS0Jq1ixTXfWuQ2+mPT6b21Xlve8XyrQmJJiYekhEA4dDNRZF3Cz949x8JdFc pAd8SbWYlntCM9JaWUx8imsMZSINYhYxaFzffAZqM0KFFv4lNQlQ5GyX6DjmKnyqvJOX S6iQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727333743; x=1727938543; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=MzHfWrObFTebylfAMReMmx0H/fNyKd6EWjjqrhs5YS8=; b=MG/8ZqcpgLtHjI5fP91LBz9nY91gAbSomCR3HJXh8eLALVNz0cHf9E2mGiduy4Q+2g seLeEH+ylTK3KWhcLz3fHFP6sEO20OYEBUcv2fdfEAbU2U/qHnyHPmskRjcLi2ABRm37 fCHyjZBzcnituWcSF+SIlymLrgDYGaXNk/uyb1REt+nwmnWKl/pEfE1sJDHNk4GSrgGE /TA3X79vJW+PMNE9+0hZpAFvns5iCHlXW6no1JeKSPk8q5dqHPWuPQEtRNlKVaASb6Ha tqSxC1ATIxuWv2wppvOBpvvidfNp0a/PQKbqYXm8UoaXgNFWRH0uv4sGP+wOEX+2CC+v Us7w== X-Forwarded-Encrypted: i=1; AJvYcCUexWu8uvNVzIyW5E26qV03j+XHYkzbGJTTJR7u+kbNhmCfZ/8KLv+eNXDaeTPTFuLtj+2EzH5rFw==@vger.kernel.org X-Gm-Message-State: AOJu0Ywi2YcfGpDZszA/njhiVDaEzVdJ+5BNIgDD2RnNx2I+dV89+Klw WZxQAN4fkhSeH0p7ZITTXGwMBpKqevSutxr9/ps7fMpjpDA4hEdO4hsEywC1p8s= X-Google-Smtp-Source: AGHT+IFJjm9aCyo95+9/VI6IL66etpFOV0OLThx3WyZZ7tnWZyAbNEO+PfCso5aAFQN+3KjsS0OA1A== X-Received: by 2002:a05:6830:6e99:b0:711:c8:1a39 with SMTP id 46e09a7af769-713c7dc1258mr4573597a34.16.1727333743142; Wed, 25 Sep 2024 23:55:43 -0700 (PDT) Received: from hsinchu35-syssw01.internal.sifive.com (59-124-168-89.hinet-ip.hinet.net. [59.124.168.89]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7e6b7c73120sm3592352a12.68.2024.09.25.23.55.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Sep 2024 23:55:42 -0700 (PDT) From: Nick Hu To: greentime.hu@sifive.com, zong.li@sifive.com, Paul Walmsley , Palmer Dabbelt , Albert Ou , "Rafael J. Wysocki" , Pavel Machek , Daniel Lezcano , Thomas Gleixner , Anup Patel , Andrew Jones , Conor Dooley , Mayuresh Chitale , Atish Patra , Samuel Holland , Nick Hu , Samuel Ortiz , Sunil V L , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 0/3] Support SSTC while PM operations Date: Thu, 26 Sep 2024 14:54:15 +0800 Message-Id: <20240926065422.226518-1-nick.hu@sifive.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When the cpu is going to be hotplug, stop the stimecmp to prevent pending interrupt. When the cpu is going to be suspended, save the stimecmp before entering the suspend state and restore it in the resume path. changes in v2: 1. Add csr_read/write_hi_lo operations 2. Apply the suggestion from Anup. link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u Nick Hu (3): riscv: Add csr_read/write_hi_lo support riscv: Add stimecmp save and restore clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug arch/riscv/include/asm/csr.h | 22 ++++++++++++++++++++++ arch/riscv/include/asm/suspend.h | 1 + arch/riscv/kernel/suspend.c | 6 ++++++ drivers/clocksource/timer-riscv.c | 6 ++++++ 4 files changed, 35 insertions(+)