From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0246EC433F5 for ; Wed, 29 Sep 2021 15:02:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7A6461381 for ; Wed, 29 Sep 2021 15:02:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344987AbhI2PDp (ORCPT ); Wed, 29 Sep 2021 11:03:45 -0400 Received: from smtp-relay-internal-1.canonical.com ([185.125.188.123]:55028 "EHLO smtp-relay-internal-1.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344958AbhI2PDn (ORCPT ); Wed, 29 Sep 2021 11:03:43 -0400 Received: from mail-ed1-f69.google.com (mail-ed1-f69.google.com [209.85.208.69]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id B514640255 for ; Wed, 29 Sep 2021 15:02:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1632927721; bh=ZHeeeZbiilEHhtw/jMIzJY6AU5jy7F+74b86hE2E++U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tJJG2yBYFwR+XkeLo1wVe1hytoIJvyDD+v+eCACXdPWUPIzyG8Ra4yVstA95rE015 YgMymNAbmR19qw/TrltwptjUH6pq0X0Olr8hvax5+/FcQUGCaTsI4P7WocbtkGLuRN zPz6d7UBS0oHp6LjkHN7Mj81K6q9jB06TpxO2NOzxRrlbFfo0rnvhbfP1fRHjOxTe+ wFvEgvSdmv7jIPSUu4z7ucsCVnksvd1R3+0X7dZ5T2MnDGGNqlNxAofszWZAcY+XUQ i8D525lICLN50IOwPQEA4c2t+iF+WeX3ViYOh2KLWF6qS29dR1jhzIRJb9K1YoWn3/ WybAowbal4f2w== Received: by mail-ed1-f69.google.com with SMTP id c7-20020a05640227c700b003d27f41f1d4so2690020ede.16 for ; Wed, 29 Sep 2021 08:02:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZHeeeZbiilEHhtw/jMIzJY6AU5jy7F+74b86hE2E++U=; b=VNrtaTe9mN0Al8MWx95g6ijeD4JTM/Irjaz+hdiLHeU9m/Oc7psFz+nDzUWn57Vkzl 4a8mm9YD/HpV8K1l+fiE0f50ATOt4v7MCb5cAjMDzUCRkZO+r4hZrHpHKTWvZTiBLLjW UBEcJZgGgdLvh0qHXL49YObrwBPTSOmf6DtNLWWQrAWpGIUPteg6DvrMJ/iTpq48dYFa KncSsJpR/Wk/eEOzJIgvOp9sFBVmTIBTtuyCe7VDLlTVd9grrKoXRcBteQN2YrtphWz0 1xegIvgQ5y/PkSf0hFoDLOBP/gDn09VStz0a5CWwkv+9wyXVfytgiqSnJRet25eF4M1K e1mw== X-Gm-Message-State: AOAM532qituXK2UW4fNX5UdGdx+PbtI8fkqfRQPKjzJgElbm/cVe8X5A RrUEDR7GiED7fQTanFmnrBzBWdgW2vjZXWwHQGXsk7SzBSI/l0rUYYkHsoctbjUJKE0zEi1uOwc hshkIdfJuIbwBwafBbcvdUdqHqHm4oSGqqH3n0JyLgQ== X-Received: by 2002:a05:6000:2c6:: with SMTP id o6mr377156wry.292.1632927708054; Wed, 29 Sep 2021 08:01:48 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy9V/fnO21N7p3bEFVhHIvHS/0Ily74/OnTsvsnaHKo/n2patag3dfQoebfGKaZ+3ZNnDo6Og== X-Received: by 2002:a05:6000:2c6:: with SMTP id o6mr377109wry.292.1632927707834; Wed, 29 Sep 2021 08:01:47 -0700 (PDT) Received: from alex.home (lfbn-lyo-1-470-249.w2-7.abo.wanadoo.fr. [2.7.60.249]) by smtp.gmail.com with ESMTPSA id h18sm133008wrs.75.2021.09.29.08.01.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Sep 2021 08:01:47 -0700 (PDT) From: Alexandre Ghiti To: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Zong Li , Anup Patel , Atish Patra , Christoph Hellwig , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Ard Biesheuvel , Arnd Bergmann , Kees Cook , Guo Ren , Heinrich Schuchardt , Mayuresh Chitale , linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v2 10/10] riscv: Allow user to downgrade to sv39 when hw supports sv48 Date: Wed, 29 Sep 2021 16:51:13 +0200 Message-Id: <20210929145113.1935778-11-alexandre.ghiti@canonical.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> References: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is made possible by using the mmu-type property of the cpu node of the device tree. By default, the kernel will boot with 4-level page table if the hw supports it but it can be interesting for the user to select 3-level page table as it is less memory consuming and faster since it requires less memory accesses in case of a TLB miss. Signed-off-by: Alexandre Ghiti --- arch/riscv/mm/init.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index a304f2b3c178..676635f5d98a 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -641,10 +641,31 @@ static void __init disable_pgtable_l4(void) * then read SATP to see if the configuration was taken into account * meaning sv48 is supported. */ -static __init void set_satp_mode(void) +static __init void set_satp_mode(uintptr_t dtb_pa) { u64 identity_satp, hw_satp; uintptr_t set_satp_mode_pmd; + int cpus_node; + + /* Check if the user asked for sv39 explicitly in the device tree */ + cpus_node = fdt_path_offset((void *)dtb_pa, "/cpus"); + if (cpus_node >= 0) { + int node; + + fdt_for_each_subnode(node, (void *)dtb_pa, cpus_node) { + const char *mmu_type = fdt_getprop((void *)dtb_pa, node, + "mmu-type", NULL); + if (!mmu_type) + continue; + + if (!strcmp(mmu_type, "riscv,sv39")) { + disable_pgtable_l4(); + return; + } + + break; + } + } set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; create_pgd_mapping(early_pg_dir, @@ -802,7 +823,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) #endif #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) - set_satp_mode(); + set_satp_mode(dtb_pa); #endif kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; -- 2.30.2 From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC8C3C433FE for ; Wed, 29 Sep 2021 15:02:19 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9CE3F61381 for ; Wed, 29 Sep 2021 15:02:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9CE3F61381 Authentication-Results: mail.kernel.org; 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[2.7.60.249]) by smtp.gmail.com with ESMTPSA id h18sm133008wrs.75.2021.09.29.08.01.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Sep 2021 08:01:47 -0700 (PDT) From: Alexandre Ghiti To: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Zong Li , Anup Patel , Atish Patra , Christoph Hellwig , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Ard Biesheuvel , Arnd Bergmann , Kees Cook , Guo Ren , Heinrich Schuchardt , Mayuresh Chitale , linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v2 10/10] riscv: Allow user to downgrade to sv39 when hw supports sv48 Date: Wed, 29 Sep 2021 16:51:13 +0200 Message-Id: <20210929145113.1935778-11-alexandre.ghiti@canonical.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> References: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210929_080151_274439_70CBF43D X-CRM114-Status: GOOD ( 17.38 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org This is made possible by using the mmu-type property of the cpu node of the device tree. By default, the kernel will boot with 4-level page table if the hw supports it but it can be interesting for the user to select 3-level page table as it is less memory consuming and faster since it requires less memory accesses in case of a TLB miss. Signed-off-by: Alexandre Ghiti --- arch/riscv/mm/init.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index a304f2b3c178..676635f5d98a 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -641,10 +641,31 @@ static void __init disable_pgtable_l4(void) * then read SATP to see if the configuration was taken into account * meaning sv48 is supported. */ -static __init void set_satp_mode(void) +static __init void set_satp_mode(uintptr_t dtb_pa) { u64 identity_satp, hw_satp; uintptr_t set_satp_mode_pmd; + int cpus_node; + + /* Check if the user asked for sv39 explicitly in the device tree */ + cpus_node = fdt_path_offset((void *)dtb_pa, "/cpus"); + if (cpus_node >= 0) { + int node; + + fdt_for_each_subnode(node, (void *)dtb_pa, cpus_node) { + const char *mmu_type = fdt_getprop((void *)dtb_pa, node, + "mmu-type", NULL); + if (!mmu_type) + continue; + + if (!strcmp(mmu_type, "riscv,sv39")) { + disable_pgtable_l4(); + return; + } + + break; + } + } set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; create_pgd_mapping(early_pg_dir, @@ -802,7 +823,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) #endif #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) - set_satp_mode(); + set_satp_mode(dtb_pa); #endif kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; -- 2.30.2 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv