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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 D9925C54E8D for ; Mon, 11 May 2020 11:26:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C19322098B for ; Mon, 11 May 2020 11:26:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729739AbgEKL0p (ORCPT ); Mon, 11 May 2020 07:26:45 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:54291 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729873AbgEKL0K (ORCPT ); Mon, 11 May 2020 07:26:10 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 49LJXS6x2Dz9ty3m; Mon, 11 May 2020 13:26:00 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id IgkSEgs_6jgi; Mon, 11 May 2020 13:26:00 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 49LJXS68rCz9ty3g; Mon, 11 May 2020 13:26:00 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 8EB018B7AE; Mon, 11 May 2020 13:26:07 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 9L0XK6pmeTwo; Mon, 11 May 2020 13:26:07 +0200 (CEST) Received: from pc16570vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 511078B7AD; Mon, 11 May 2020 13:26:07 +0200 (CEST) Received: by pc16570vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 3253565A09; Mon, 11 May 2020 11:26:07 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v3 40/45] powerpc/8xx: Map linear memory with huge pages To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Mon, 11 May 2020 11:26:07 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Map linear memory space with 512k and 8M pages whenever possible. Three mappings are performed: - One for kernel text - One for RO data - One for the rest Separating the mappings is done to be able to update the protection later when using STRICT_KERNEL_RWX. The ITLB miss handler now need to also handle huge TLBs unless kernel text in pinned. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_8xx.S | 4 +-- arch/powerpc/mm/nohash/8xx.c | 50 +++++++++++++++++++++++++++++++++- 2 files changed, 51 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 9a117b9f0998..abb71fad7d6a 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -224,7 +224,7 @@ InstructionTLBMiss: 3: mtcr r11 #endif -#ifdef CONFIG_HUGETLBFS +#if defined(CONFIG_HUGETLBFS) || !defined(CONFIG_PIN_TLB_TEXT) lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r10) /* Get level 1 entry */ mtspr SPRN_MD_TWC, r11 #else @@ -234,7 +234,7 @@ InstructionTLBMiss: #endif mfspr r10, SPRN_MD_TWC lwz r10, 0(r10) /* Get the pte */ -#ifdef CONFIG_HUGETLBFS +#if defined(CONFIG_HUGETLBFS) || !defined(CONFIG_PIN_TLB_TEXT) rlwimi r11, r10, 32 - 9, _PMD_PAGE_512K mtspr SPRN_MI_TWC, r11 #endif diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index fb31a0c1c2a4..c62cab996d4d 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -126,20 +126,68 @@ void __init mmu_mapin_immr(void) PAGE_KERNEL_NCG, MMU_PAGE_512K, true); } +static void __init mmu_mapin_ram_chunk(unsigned long offset, unsigned long top, + pgprot_t prot, bool new) +{ + unsigned long v = PAGE_OFFSET + offset; + unsigned long p = offset; + + WARN_ON(!IS_ALIGNED(offset, SZ_512K) || !IS_ALIGNED(top, SZ_512K)); + + for (; p < ALIGN(p, SZ_8M) && p < top; p += SZ_512K, v += SZ_512K) + __early_map_kernel_hugepage(v, p, prot, MMU_PAGE_512K, new); + for (; p < ALIGN_DOWN(top, SZ_8M) && p < top; p += SZ_8M, v += SZ_8M) + __early_map_kernel_hugepage(v, p, prot, MMU_PAGE_8M, new); + for (; p < ALIGN_DOWN(top, SZ_512K) && p < top; p += SZ_512K, v += SZ_512K) + __early_map_kernel_hugepage(v, p, prot, MMU_PAGE_512K, new); + + if (!new) + flush_tlb_kernel_range(PAGE_OFFSET + v, PAGE_OFFSET + top); +} + unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) { + unsigned long etext8 = ALIGN(__pa(_etext), SZ_8M); + unsigned long sinittext = __pa(_sinittext); + unsigned long boundary = strict_kernel_rwx_enabled() ? sinittext : etext8; + unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); + + WARN_ON(top < einittext8); + mmu_mapin_immr(); - return 0; + if (__map_without_ltlbs) + return 0; + + mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, true); + mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL_TEXT, true); + mmu_mapin_ram_chunk(einittext8, top, PAGE_KERNEL, true); + + if (top > SZ_32M) + memblock_set_current_limit(top); + + block_mapped_ram = top; + + return top; } void mmu_mark_initmem_nx(void) { + unsigned long etext8 = ALIGN(__pa(_etext), SZ_8M); + unsigned long sinittext = __pa(_sinittext); + unsigned long boundary = strict_kernel_rwx_enabled() ? sinittext : etext8; + unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); + + mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, false); + mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false); } #ifdef CONFIG_STRICT_KERNEL_RWX void mmu_mark_rodata_ro(void) { + unsigned long sinittext = __pa(_sinittext); + + mmu_mapin_ram_chunk(0, sinittext, PAGE_KERNEL_ROX, false); } #endif -- 2.25.0