From patchwork Fri Jul 14 00:14:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 13312804 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 29AE3C001DE for ; Fri, 14 Jul 2023 00:15:10 +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=p9DGfU2LAYi9xUmWGZBVnkyQNplSZ1iMF81G6Jng2Fs=; b=HGPIDwq7JnJOYU i0coSgnd+Li//So9yI75u/Uc65vJKSYsKmv24S5AXei24rpM8oIMHw821Z8+ZBDOFdgGXtNKWAXHl Qeq6jGwsBJaCp5eIWIaFMlK6M36RmC7qmKuFDoDSy36XVrx2ksdXrDuS9vfT0+qDcG1qRQF5bX1cE ztaxzTE7kMeiqZRBvC2mT2B/r5XEt0iC5jUlLGM7xu3ybIJNWZaOgEz1gIBCSfIE73PEN8oO1mLFw cz5quP2JbLv5vEOg0V4365/8zPBueiVGdCBupxBgHdgd9iFixpsjYDFTsbcVPteXHasbw+kh3g4xL cZtRb/3tS/qn6MmxYvdA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qK6Se-004cVH-2a; Fri, 14 Jul 2023 00:15:04 +0000 Received: from mail-pf1-x42f.google.com ([2607:f8b0:4864:20::42f]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qK6Sb-004cSe-0r for linux-riscv@lists.infradead.org; Fri, 14 Jul 2023 00:15:02 +0000 Received: by mail-pf1-x42f.google.com with SMTP id d2e1a72fcca58-668704a5b5bso1339710b3a.0 for ; Thu, 13 Jul 2023 17:15:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1689293700; x=1689898500; 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=WogNqZmM5qIDEUwvyRv9RC9FRo2r68Wx4DIsyw3FtoM=; b=scmvmusinfT3X+K4TbCSiNrHD6GpfF3g/xu+9lahYYjU4ktFpp9PuohAB7wYjo2/7I /Mw7Dgl25dGudOqR4ayvcdQwHPhIOUDVymcob+uLiwh7kXLYl9glDGllZn9xoAMoP1is JCHFj5AIY7Nq6ca/fp7M1KmHBu5NUIQcKKnZx+xUDj2awa23VFRB8c4lTb/leJGEhfER 4S0RS8ULwsXWaVxCTPqOQTgpYI4hHeBp8dZ5ZB4/0RGM+X4cJLHMcheFvejUGBiL9t9M gCwPO8pH+w5DPvkfsvoLXokFvSLh0QIFcQB6sb4P+NguJuj4IrWxEgEI6vt33bo0OBbj FTzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689293700; x=1689898500; 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=WogNqZmM5qIDEUwvyRv9RC9FRo2r68Wx4DIsyw3FtoM=; b=bZPf0ZQ3gNr2F1Y97xqlRgjdfNvV+UjmmWoKa3wgCHYnIUt5RaWNV4YDsePWYyH55E uPK8Cp+uCy60/YOIoww+K832uXwhMETQi90AW+T1UshtpmiSaxT5l3gnwxShiebsujyo I1T7khoZD6hKKaMuhFfrt6pqb+QCuUp34qobM+qjngufaRJh8gDkruTiGjmvP3Pp5BxT nIJwOZ+1lGQIypH7flg8pEnh+lFPz3y3c+W5SfgNx2bfGJfRdSM/Rco/5v80tRPXW+9y Gm7DDtxwosH4gDBsBQgaK0u+aSEtC2IerhllfLDTrGATbzJ52CYf1bBlHEqK8TYohnrS G4Kg== X-Gm-Message-State: ABy/qLYHAn03RUIepVoDxGuPdlPwb0fZcywdyBiti2ovLRhiu/mA2FfI ldwopGQKcA1XbCNFFdly03E9JQ== X-Google-Smtp-Source: APBJJlF99rw3p+D/V7h80wItL1ogt7q2SWOZln6YuZpHDidkN54eC97ZWfBnsDKm67js+3dBZPQKGw== X-Received: by 2002:a05:6a20:1445:b0:130:52c5:5123 with SMTP id a5-20020a056a20144500b0013052c55123mr3737553pzi.3.1689293699862; Thu, 13 Jul 2023 17:14:59 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id x25-20020aa793b9000000b00673e652985esm5938107pff.44.2023.07.13.17.14.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 17:14:59 -0700 (PDT) From: Charlie Jenkins To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.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 v5 3/4] RISC-V: mm: Update pgtable comment documentation Date: Thu, 13 Jul 2023 17:14:02 -0700 Message-ID: <20230714001430.75798-4-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230714001430.75798-1-charlie@rivosinc.com> References: <20230714001430.75798-1-charlie@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230713_171501_305519_A1090665 X-CRM114-Status: UNSURE ( 9.21 ) 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 --- 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 e13f5872bfe9..28660bab754c 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -840,14 +840,16 @@ 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)