From patchwork Wed Feb 19 11:41:34 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nick Hu X-Patchwork-Id: 13982023 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 373E1C021B1 for ; Wed, 19 Feb 2025 11:42:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dyzP7B3+i1arZIN5oLIVE7cA0YoCnTYSlywcqbqoi2Y=; b=omkQbhcR6/0Ns6 S8fOJUGliYLRb5jSL8S9uoHBxlRxH4efKbpk42iitLrJb5lNXUc8CZ5CogEq0GkoaccKddV0uVJ4e 3//5esrQA8T0I/rffDNekgSDJiuAKmddLJCeP72q2vVU2Jyzvte+JlGxxp0MxMN30wSQE2Q4FUIgP 9vFuc7NKpG/TbTCDJEVq/3LydDqO7KcgZsyviCXV4Pa+aVvPYJc+9qVhsFPHDRJek8bY2U9Ca94+7 Usl5rB9vWR9SxkrHgG01c3sGNk1Q9F4etP8qa4PdT277Fkn+i3b/J83dESp/+NC8/Z1Y86BxYBDBl 6s65gcm4MVYTSIIFl44Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tkiSj-0000000CTHk-21HT; Wed, 19 Feb 2025 11:41:57 +0000 Received: from mail-pl1-x630.google.com ([2607:f8b0:4864:20::630]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tkiSg-0000000CTGE-3Wmb for linux-riscv@lists.infradead.org; Wed, 19 Feb 2025 11:41:55 +0000 Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-220ecbdb4c2so138000705ad.3 for ; Wed, 19 Feb 2025 03:41:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1739965314; x=1740570114; darn=lists.infradead.org; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=TvtQB/lGlc+Tk5xjdqGmPEVFQSYg82f1Tgy36DWvKQU=; b=cSGmR5W6yOjqNhoBDZKt164epZVwKQagDLSCPptp2kyK1zq8UX07oQz9GSeGqEIP+b mMLi8QTbRHwCFMHR+mvUaA7S8+uV/x6qRBWwrIfsUaPikl/fIfCWVZCSJTAK9sLfnPOQ Cg5TdaQJp+LqvCDi+xDP4KV7kRq7AtGJo5rE/CP23aSbX/oYNbn8XDOjt289Iy1KqO4r aAD1C7BYzgkwDDj5IX0DjPuN0nq5HuhqAb3FY/oexmxELSrIrbyuQ3Y+kxhXSlGpCq+G Y7dsunyUrvWjnM7wnoR3EDFT/HhoA7+TqWohMD4kVsWy6Iin3axuxGiO9JoVdaOgcnXm gdQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739965314; x=1740570114; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=TvtQB/lGlc+Tk5xjdqGmPEVFQSYg82f1Tgy36DWvKQU=; b=rLoFnHZrfj8HaOVM+nDpiKYCS5pr1p1cS2B1QamTJfgMRBnxnzuUEAERxCZ3A1/q05 nYTfFPj6wNwGZi4XdOtM1omC8V6w39Ml7UxQiRnHk0THBwIjUBgZhHJP28gv/z/0sOfo Wgkiq+H8FxrWAaiy9yNyBeBlWYRoHB4xuoDQY6jjF6GnCuDw+GDxAdhMmE6fT2vX2Dek W/wEooSf+GuHXiZJSC3KoBVhvktVpMzlEmKvPeSRne3Cx07aINiH5rmxIY/EsuXvpTE+ c9/xw5tLBbVeAD/j0H+LjTZgv/pNxD6kPHiAsmSQ5TUdKyxDy4CUPO25l8G6a9eBkh6W bGEA== X-Forwarded-Encrypted: i=1; AJvYcCXTscPoH9gPI1Tkt3rxdXlkZKY4QMrIeTACBR3Vf6H7HfI+C3sSI1z7jTgLlCkw6gKluIcZd2CjllxRRg==@lists.infradead.org X-Gm-Message-State: AOJu0YyjR2DFRDB5AljLWVBquc9ey4Fo3WX2DlhAJesNKVHvFzNYbBP/ 9tSrYVCnySsXRlMDvGNJYQW6jn4cCz8d5g7xPsb5tkNudmAGWGsgkh/ZPxXkYzg= X-Gm-Gg: ASbGnctrKr6TFyBDfbBd/QmahgJEvrjifPjyt/udzBWCb0LmZ1CTt4jFcJ4QfNY7QKe KjYEdZZeIapWHauh0TvkIdTL6f7jFkjq94vebwhdlHahPDR2rzjA+U+7zlzcXHBbxdIs/4Y0nOA qh1CZSyKZ1N8inhI8EhSlmjvq+SfIaSabYJH7S+JT/TPfLtVJdSQxgihD5fCySfsftE1l8JQ/d3 i6K25HameCEzkNSfWPd5rGYBkZFuy7rjatsD4fZiKvCwPB7csc0eeXn7qgPpMZjO81IEWR3pmTu URA7ujkTNcMeb1+jfvzv/uOynOmd2V4OkE3LTg== X-Google-Smtp-Source: AGHT+IE6NLalTRKF906UogoaqA2vkhz8eL3B86SceRlnQGiSoGs39HTOQJs5eyoh/PazNPL54JFJxQ== X-Received: by 2002:a17:902:dac5:b0:21f:507b:9ada with SMTP id d9443c01a7336-2210405cc66mr282536845ad.31.1739965313971; Wed, 19 Feb 2025 03:41:53 -0800 (PST) Received: from hsinchu26.internal.sifive.com ([210.176.154.34]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-220d545d507sm103218545ad.145.2025.02.19.03.41.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Feb 2025 03:41:53 -0800 (PST) From: Nick Hu To: "Rafael J. Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: Nick Hu , linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] riscv: Add stimecmp save and restore Date: Wed, 19 Feb 2025 19:41:34 +0800 Message-Id: <20250219114135.27764-2-nick.hu@sifive.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250219114135.27764-1-nick.hu@sifive.com> References: <20250219114135.27764-1-nick.hu@sifive.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250219_034154_879757_0187E819 X-CRM114-Status: GOOD ( 10.29 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org If the HW support the SSTC extension, we should save and restore the stimecmp register while cpu non retention suspend. Signed-off-by: Nick Hu Reviewed-by: Anup Patel --- arch/riscv/include/asm/suspend.h | 4 ++++ arch/riscv/kernel/suspend.c | 14 ++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/suspend.h index 4ffb022b097f..dc5782b5fbad 100644 --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -18,6 +18,10 @@ struct suspend_context { unsigned long ie; #ifdef CONFIG_MMU unsigned long satp; + unsigned long stimecmp; +#if __riscv_xlen < 64 + unsigned long stimecmph; +#endif #endif }; diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index 9a8a0dc035b2..24b3f57d467f 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -30,6 +30,13 @@ void suspend_save_csrs(struct suspend_context *context) */ #ifdef CONFIG_MMU + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + context->stimecmp = csr_read(CSR_STIMECMP); +#if __riscv_xlen < 64 + context->stimecmph = csr_read(CSR_STIMECMPH); +#endif + } + context->satp = csr_read(CSR_SATP); #endif } @@ -43,6 +50,13 @@ void suspend_restore_csrs(struct suspend_context *context) csr_write(CSR_IE, context->ie); #ifdef CONFIG_MMU + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + csr_write(CSR_STIMECMP, context->stimecmp); +#if __riscv_xlen < 64 + csr_write(CSR_STIMECMPH, context->stimecmph); +#endif + } + csr_write(CSR_SATP, context->satp); #endif }