From patchwork Fri Jan 6 06:05:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sia Jee Heng X-Patchwork-Id: 13090957 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 10882C3DA7A for ; Fri, 6 Jan 2023 06:06:58 +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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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:In-Reply-To:References: List-Owner; bh=Q13HcRpHwI7jU2nlI+wg/okKyKvSfmYLwvdIzgFpS9Q=; b=JgYKS0Io2boo9w UtEI95s7o9kZlwKfeHfSJkJjwwKyirBvknsREaK8RpYB17OR2D6byHm+aonmlCAEbaL+76GYSsibx hSF+1zIlszk3a+9OnR8XYJoF2fyv0W8ewmIYer+l49ktZZbwXbGE0ja+w15/SpJ/wPmtRGnroluxS 2Cm4dc126dfooq+PLhxKXmxYjSYlIAPCWWJ53f94aie4k5SXBzkdoUG+/SRMIOQt78nsJ72T7qbRz fma1VHmMHrZBvQKBi14MhZkEW9V5cNEbkWGSTtocxK6t1AU/uY0wqcKNeKqmXO5tGNMgHGuqRm913 gfl7x6pa6TFXxwTIh/hw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pDfsI-002uXI-F9; Fri, 06 Jan 2023 06:06:42 +0000 Received: from fd01.gateway.ufhost.com ([61.152.239.71]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pDfs4-002pPY-EU for linux-riscv@lists.infradead.org; Fri, 06 Jan 2023 06:06:38 +0000 Received: from EXMBX166.cuchost.com (unknown [175.102.18.54]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "EXMBX166", Issuer "EXMBX166" (not verified)) by fd01.gateway.ufhost.com (Postfix) with ESMTP id 7583424E035; Fri, 6 Jan 2023 14:05:45 +0800 (CST) Received: from EXMBX066.cuchost.com (172.16.7.66) by EXMBX166.cuchost.com (172.16.6.76) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Fri, 6 Jan 2023 14:05:45 +0800 Received: from jsia-virtual-machine.localdomain (202.188.176.82) by EXMBX066.cuchost.com (172.16.6.66) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Fri, 6 Jan 2023 14:05:41 +0800 From: Sia Jee Heng To: , , CC: , , , , Subject: [PATCH 0/3] RISC-V Hibernation Support Date: Fri, 6 Jan 2023 14:05:32 +0800 Message-ID: <20230106060535.104321-1-jeeheng.sia@starfivetech.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [202.188.176.82] X-ClientProxiedBy: EXCAS061.cuchost.com (172.16.6.21) To EXMBX066.cuchost.com (172.16.6.66) X-YovoleRuleAgent: yovoleflag X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230105_220633_434086_14105F98 X-CRM114-Status: GOOD ( 13.98 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org This series adds RISC-V Hibernation/suspend to disk support. Low level Arch functions were created to support hibernation. swsusp_arch_suspend() relies code from __cpu_suspend_enter() to write cpu state onto the stack, then calling swsusp_save() to save the memory image. arch_hibernation_header_restore() and arch_hibernation_header_save() functions are implemented to prevent kernel crash when resume, the kernel built version is saved into the hibernation image header to making sure only the same kernel is restore when resume. swsusp_arch_resume() creates a temporary page table that covering only the linear map, copies the restore code to a 'safe' page, then start to restore the memory image. Once completed, it restores the original kernel's page table. It then calls into __hibernate_cpu_resume() to restore the CPU context. Finally, it follows the normal hibernation path back to the hibernation core. To enable hibernation/suspend to disk into RISCV, the below config need to be enabled: - CONFIG_ARCH_HIBERNATION_HEADER - CONFIG_ARCH_HIBERNATION_POSSIBLE At high-level, this series includes the following changes: 1) Change suspend_save_csrs() and suspend_restore_csrs() to public function as these functions are common to suspend/hibernation. (patch 1) 2) Enhance kernel_page_present() function to support huge page. (patch 2) 3) Add arch/riscv low level functions to support hibernation/suspend to disk. (patch 3) The above patches are based on kernel v6.2-rc2 and are tested on Starfive VF2 SBC board. Sia Jee Heng (3): RISC-V: Change suspend_save_csrs and suspend_restore_csrs to public function RISC-V: mm: Enable huge page support to kernel_page_present() function RISC-V: Add arch functions to support hibernation/suspend-to-disk arch/riscv/Kconfig | 7 + arch/riscv/include/asm/suspend.h | 23 ++ arch/riscv/kernel/Makefile | 2 +- arch/riscv/kernel/asm-offsets.c | 5 + arch/riscv/kernel/hibernate-asm.S | 123 +++++++++++ arch/riscv/kernel/hibernate.c | 353 ++++++++++++++++++++++++++++++ arch/riscv/kernel/suspend.c | 4 +- arch/riscv/mm/pageattr.c | 6 + 8 files changed, 520 insertions(+), 3 deletions(-) create mode 100644 arch/riscv/kernel/hibernate-asm.S create mode 100644 arch/riscv/kernel/hibernate.c base-commit: 1f5abbd77e2c1787e74b7c2caffac97def78ba52