From patchwork Thu Jul 27 21:26:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 13330793 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 18B6CC001DC for ; Thu, 27 Jul 2023 21:27:09 +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: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=brEcgb8ewc8fC15DQeceXLImdYtsnSvcggm+iRn8JSE=; b=pvQ9DW1MT95C+o bukb3EShVsyEa+pdvAeruRGPMQd1RB9hxyePlc83C6zo5xA1ZbzCrviTXG1H2IQlfk88YU+rTwwCJ rE80J1huOih0fTWpZL1Jza3na8THM1epOV2/rPiRbr2rsMseJufv69LDYai0AmU9ooz2D6HJcmTVV FhEoJPX88eA0TLIApT10eNu87vaHHTlN0ByMvp3lrbj0Z7IP2pUWQTXKRVCnBLLLeHA9z5Vwmk6f/ lFmhyksvKLBT+UlZZ3gGhHbh6b0R5f5q/Zg7ar00sy+zOk12WXpqbeZlwlHubPEwImyJsdfI8bDKl oSgR6wKguxLeOSi0L5Vw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qP8Vk-000c42-1p; Thu, 27 Jul 2023 21:27:04 +0000 Received: from mail-pf1-x42d.google.com ([2607:f8b0:4864:20::42d]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qP8Ve-000bxx-1P for linux-riscv@lists.infradead.org; Thu, 27 Jul 2023 21:27:01 +0000 Received: by mail-pf1-x42d.google.com with SMTP id d2e1a72fcca58-686f1240a22so1205124b3a.0 for ; Thu, 27 Jul 2023 14:26:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1690493215; x=1691098015; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=nxIryN+/nGnN7q5/mJrC1dQ+rinWckKL0IS2jYwlkeI=; b=HH7TEI0FKqELKzYIXsjAzNMOv7EmEk19k49xsmg5JJ2iJpQjJBUsJBektepS7kbqjA Vt/YOabaV+5seRyrTS+nQFfXRu/Rmc0qF/Cmuzi6vbvzfQQ7hYiZSyJOGxFRzI1tA3px fkP0ufFuAla153rOmkqGNp0bHyeGAvpUM3evTA9mfbdGVkW+96ufuS/f54M74SC3GCRo WqzWIVc8ARWe8/mWjw/9xYezMnJhgSJlmpSTw5U4/6ICvlMwjc3VVGpkITduwPQnE0vT zFsh4Tq4pcASeCN6YVhHilpdFEEvWGuxwZ4SH0AQAfZfQIb9FQNxijHErK3RcGa3TLoV 6PHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690493215; x=1691098015; h=content-transfer-encoding:mime-version: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=nxIryN+/nGnN7q5/mJrC1dQ+rinWckKL0IS2jYwlkeI=; b=QgE0SuM9sgKTyXpI9A8PJROMjVtW5tC/xjd8P+HZFO9lznIFmoJJyV/jvEWr/Cv1Vm 3gJ5i22vjN8nVBoDRiziigAp/ROyW8PjsGZ8ay5SfvC0CSmgcdWXw5R2AKH3C5coVp7u El/L1mTyQVJJtv3Q9d6HKYxUzuWXhlOanVBB+98vN34k/qPD2gcV6v0dwZ8+L8Em/8jb MydAHcAsiO0JoyqK7JwX2gz8BSK2G+NNGdx1HtMJ7LE46ywuzjhqrAoK4Socxsvl1lNh RVr8fKu83xfJAYG6/Y/ZaDYhjiNcT3hnNpLoq/V7xpIZNotdNatxEOUgCpZJzxMCO3/S OGdA== X-Gm-Message-State: ABy/qLb7molz4M1xbCHGs/LWWt5LGznPtXLyw1U/gtTes9Y3icwn7fW2 qILJ95jZsv4rr7MDxI0AvYbZBZDorsOuak7gx4U= X-Google-Smtp-Source: APBJJlH69UlfwIWPYbCOxQtQ76ua+pdw1/ixsjQRFRBQgUh0yQ7pLCSXX0UzINbZgQLjLL4GlXZWZw== X-Received: by 2002:a05:6a00:2316:b0:668:82fe:16f1 with SMTP id h22-20020a056a00231600b0066882fe16f1mr369674pfh.1.1690493215262; Thu, 27 Jul 2023 14:26:55 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id c5-20020aa78c05000000b00682562b1549sm1912312pfd.24.2023.07.27.14.26.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 14:26:54 -0700 (PDT) From: Charlie Jenkins To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: charlie@rivosinc.com, conor@kernel.org, paul.walmsley@sifive.com, palmer@rivosinc.com, aou@eecs.berkeley.edu, anup@brainfault.org, konstantin@linuxfoundation.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, mick@ics.forth.gr, jrtc27@jrtc27.com, rdunlap@infradead.org, alexghiti@rivosinc.com Subject: [PATCH v8 3/4] RISC-V: mm: Update pgtable comment documentation Date: Thu, 27 Jul 2023 14:26:28 -0700 Message-ID: <20230727212647.4182407-4-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230727212647.4182407-1-charlie@rivosinc.com> References: <20230727212647.4182407-1-charlie@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230727_142658_473257_B4622800 X-CRM114-Status: UNSURE ( 9.26 ) X-CRM114-Notice: Please train this message. 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 sv57 is supported in the kernel so pgtable.h should reflect that. Signed-off-by: Charlie Jenkins Reviewed-by: Alexandre Ghiti --- arch/riscv/include/asm/pgtable.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index c76a1ef094a4..b551467a1dd8 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -848,14 +848,16 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32. * Note that PGDIR_SIZE must evenly divide TASK_SIZE. * Task size is: - * - 0x9fc00000 (~2.5GB) for RV32. - * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu - * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu + * - 0x9fc00000 (~2.5GB) for RV32. + * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu + * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu + * - 0x100000000000000 ( 64PB) for RV64 using SV57 mmu * * Note that PGDIR_SIZE must evenly divide TASK_SIZE since "RISC-V * Instruction Set Manual Volume II: Privileged Architecture" states that * "load and store effective addresses, which are 64bits, must have bits * 63–48 all equal to bit 47, or else a page-fault exception will occur." + * Similarly for SV57, bits 63–57 must be equal to bit 56. */ #ifdef CONFIG_64BIT #define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2)