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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED 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 753E1C11F66 for ; Thu, 1 Jul 2021 01:51:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A01A61474 for ; Thu, 1 Jul 2021 01:51:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238473AbhGABxu (ORCPT ); Wed, 30 Jun 2021 21:53:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:43376 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238468AbhGABxu (ORCPT ); Wed, 30 Jun 2021 21:53:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 133346105A; Thu, 1 Jul 2021 01:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1625104280; bh=YYTDxqTLO8oAwMJ92YvzyVaLGdGA6vqLkJ2NZzliz7U=; h=Date:From:To:Subject:In-Reply-To:From; b=xIyumq6JDdZC3dSAHPq+NdsaXjY+RE1BjQWbgDi0eI1mlOYAar3MtcHYSvOFtNrzy BE+Q4r6/50UeWNGRXPgmNjz9rhUbAYcDYCFmfmBNJiUMPoyMx2MOE9I3ShJU/KDi6F IXYwkgpuV4dS6qpoyG4ueNX7wY3bvSKzkMzhAICk= Date: Wed, 30 Jun 2021 18:51:19 -0700 From: Andrew Morton To: akpm@linux-foundation.org, anshuman.khandual@arm.com, ardb@kernel.org, catalin.marinas@arm.com, david@redhat.com, linux-mm@kvack.org, mark.rutland@arm.com, maz@kernel.org, mm-commits@vger.kernel.org, rppt@linux.ibm.com, torvalds@linux-foundation.org, wangkefeng.wang@huawei.com, will@kernel.org Subject: [patch 078/192] arm64: decouple check whether pfn is in linear map from pfn_valid() Message-ID: <20210701015119.-TOEhD-PZ%akpm@linux-foundation.org> In-Reply-To: <20210630184624.9ca1937310b0dd5ce66b30e7@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Mike Rapoport Subject: arm64: decouple check whether pfn is in linear map from pfn_valid() The intended semantics of pfn_valid() is to verify whether there is a struct page for the pfn in question and nothing else. Yet, on arm64 it is used to distinguish memory areas that are mapped in the linear map vs those that require ioremap() to access them. Introduce a dedicated pfn_is_map_memory() wrapper for memblock_is_map_memory() to perform such check and use it where appropriate. Using a wrapper allows to avoid cyclic include dependencies. While here also update style of pfn_valid() so that both pfn_valid() and pfn_is_map_memory() declarations will be consistent. Link: https://lkml.kernel.org/r/20210511100550.28178-4-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: David Hildenbrand Acked-by: Ard Biesheuvel Reviewed-by: Kefeng Wang Cc: Anshuman Khandual Cc: Catalin Marinas Cc: Marc Zyngier Cc: Mark Rutland Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/arm64/include/asm/memory.h | 2 +- arch/arm64/include/asm/page.h | 3 ++- arch/arm64/kvm/mmu.c | 2 +- arch/arm64/mm/init.c | 12 ++++++++++++ arch/arm64/mm/ioremap.c | 4 ++-- arch/arm64/mm/mmu.c | 2 +- 6 files changed, 19 insertions(+), 6 deletions(-) --- a/arch/arm64/include/asm/memory.h~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/include/asm/memory.h @@ -369,7 +369,7 @@ static inline void *phys_to_virt(phys_ad #define virt_addr_valid(addr) ({ \ __typeof__(addr) __addr = __tag_reset(addr); \ - __is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \ + __is_lm_address(__addr) && pfn_is_map_memory(virt_to_pfn(__addr)); \ }) void dump_mem_limit(void); --- a/arch/arm64/include/asm/page.h~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/include/asm/page.h @@ -37,7 +37,8 @@ void copy_highpage(struct page *to, stru typedef struct page *pgtable_t; -extern int pfn_valid(unsigned long); +int pfn_valid(unsigned long pfn); +int pfn_is_map_memory(unsigned long pfn); #include --- a/arch/arm64/kvm/mmu.c~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/kvm/mmu.c @@ -85,7 +85,7 @@ void kvm_flush_remote_tlbs(struct kvm *k static bool kvm_is_device_pfn(unsigned long pfn) { - return !pfn_valid(pfn); + return !pfn_is_map_memory(pfn); } static void *stage2_memcache_zalloc_page(void *arg) --- a/arch/arm64/mm/init.c~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/mm/init.c @@ -256,6 +256,18 @@ int pfn_valid(unsigned long pfn) } EXPORT_SYMBOL(pfn_valid); +int pfn_is_map_memory(unsigned long pfn) +{ + phys_addr_t addr = PFN_PHYS(pfn); + + /* avoid false positives for bogus PFNs, see comment in pfn_valid() */ + if (PHYS_PFN(addr) != pfn) + return 0; + + return memblock_is_map_memory(addr); +} +EXPORT_SYMBOL(pfn_is_map_memory); + static phys_addr_t memory_limit = PHYS_ADDR_MAX; /* --- a/arch/arm64/mm/ioremap.c~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/mm/ioremap.c @@ -43,7 +43,7 @@ static void __iomem *__ioremap_caller(ph /* * Don't allow RAM to be mapped. */ - if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr)))) + if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr)))) return NULL; area = get_vm_area_caller(size, VM_IOREMAP, caller); @@ -84,7 +84,7 @@ EXPORT_SYMBOL(iounmap); void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size) { /* For normal memory we already have a cacheable mapping. */ - if (pfn_valid(__phys_to_pfn(phys_addr))) + if (pfn_is_map_memory(__phys_to_pfn(phys_addr))) return (void __iomem *)__phys_to_virt(phys_addr); return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL), --- a/arch/arm64/mm/mmu.c~arm64-decouple-check-whether-pfn-is-in-linear-map-from-pfn_valid +++ a/arch/arm64/mm/mmu.c @@ -82,7 +82,7 @@ void set_swapper_pgd(pgd_t *pgdp, pgd_t pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot) { - if (!pfn_valid(pfn)) + if (!pfn_is_map_memory(pfn)) return pgprot_noncached(vma_prot); else if (file->f_flags & O_SYNC) return pgprot_writecombine(vma_prot); _