From patchwork Mon Jan 4 19:58:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 357128 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C5489C433E0 for ; Mon, 4 Jan 2021 20:10:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 827B621BE5 for ; Mon, 4 Jan 2021 20:10:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727310AbhADUKH (ORCPT ); Mon, 4 Jan 2021 15:10:07 -0500 Received: from relay8-d.mail.gandi.net ([217.70.183.201]:38227 "EHLO relay8-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726610AbhADUKH (ORCPT ); Mon, 4 Jan 2021 15:10:07 -0500 X-Originating-IP: 90.112.190.212 Received: from debian.home (lfbn-gre-1-231-212.w90-112.abo.wanadoo.fr [90.112.190.212]) (Authenticated sender: alex@ghiti.fr) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 8C6BB1BF204; Mon, 4 Jan 2021 20:09:22 +0000 (UTC) From: Alexandre Ghiti To: Paul Walmsley , Palmer Dabbelt , Zong Li , Anup Patel , Christoph Hellwig , Ard Biesheuvel , Arnd Bergmann , linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexandre Ghiti , Palmer Dabbelt Subject: [RFC PATCH 10/12] riscv: Use pgtable_l4_enabled to output mmu type in cpuinfo Date: Mon, 4 Jan 2021 14:58:38 -0500 Message-Id: <20210104195840.1593-11-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210104195840.1593-1-alex@ghiti.fr> References: <20210104195840.1593-1-alex@ghiti.fr> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Now that the mmu type is determined at runtime using SATP characteristic, use the global variable pgtable_l4_enabled to output mmu type of the processor through /proc/cpuinfo instead of relying on device tree infos. Signed-off-by: Alexandre Ghiti Reviewed-by: Anup Patel Reviewed-by: Palmer Dabbelt --- arch/riscv/include/asm/pgtable.h | 1 + arch/riscv/kernel/cpu.c | 23 ++++++++++++----------- 2 files changed, 13 insertions(+), 11 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index dd27d28f1d9e..95721016049d 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -495,6 +495,7 @@ extern char _start[]; extern void *dtb_early_va; extern uintptr_t dtb_early_pa; extern u64 satp_mode; +extern bool pgtable_l4_enabled; void setup_bootmem(void); void paging_init(void); diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c index 6d59e6906fdd..dea9b1c31889 100644 --- a/arch/riscv/kernel/cpu.c +++ b/arch/riscv/kernel/cpu.c @@ -7,6 +7,7 @@ #include #include #include +#include /* * Returns the hart ID of the given device tree node, or -ENODEV if the node @@ -70,18 +71,19 @@ static void print_isa(struct seq_file *f, const char *isa) seq_puts(f, "\n"); } -static void print_mmu(struct seq_file *f, const char *mmu_type) +static void print_mmu(struct seq_file *f) { + char sv_type[16]; + #if defined(CONFIG_32BIT) - if (strcmp(mmu_type, "riscv,sv32") != 0) - return; + strncpy(sv_type, "sv32", 5); #elif defined(CONFIG_64BIT) - if (strcmp(mmu_type, "riscv,sv39") != 0 && - strcmp(mmu_type, "riscv,sv48") != 0) - return; + if (pgtable_l4_enabled) + strncpy(sv_type, "sv48", 5); + else + strncpy(sv_type, "sv39", 5); #endif - - seq_printf(f, "mmu\t\t: %s\n", mmu_type+6); + seq_printf(f, "mmu\t\t: %s\n", sv_type); } static void *c_start(struct seq_file *m, loff_t *pos) @@ -106,14 +108,13 @@ static int c_show(struct seq_file *m, void *v) { unsigned long cpu_id = (unsigned long)v - 1; struct device_node *node = of_get_cpu_node(cpu_id, NULL); - const char *compat, *isa, *mmu; + const char *compat, *isa; seq_printf(m, "processor\t: %lu\n", cpu_id); seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id)); if (!of_property_read_string(node, "riscv,isa", &isa)) print_isa(m, isa); - if (!of_property_read_string(node, "mmu-type", &mmu)) - print_mmu(m, mmu); + print_mmu(m); if (!of_property_read_string(node, "compatible", &compat) && strcmp(compat, "riscv")) seq_printf(m, "uarch\t\t: %s\n", compat);