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=-2.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLACK,URIBL_BLOCKED autolearn=no 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 D151CC433E0 for ; Wed, 3 Jun 2020 23:00:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8228E208C9 for ; Wed, 3 Jun 2020 23:00:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="HDSVHSMR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8228E208C9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2E52D28004B; Wed, 3 Jun 2020 19:00:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 29745280003; Wed, 3 Jun 2020 19:00:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1B34328004B; Wed, 3 Jun 2020 19:00:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0188.hostedemail.com [216.40.44.188]) by kanga.kvack.org (Postfix) with ESMTP id F41C2280003 for ; Wed, 3 Jun 2020 19:00:36 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id B916C33C4 for ; Wed, 3 Jun 2020 23:00:36 +0000 (UTC) X-FDA: 76889421672.08.frogs70_225e80841c52e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin08.hostedemail.com (Postfix) with ESMTP id A078F1819E764 for ; Wed, 3 Jun 2020 23:00:36 +0000 (UTC) X-HE-Tag: frogs70_225e80841c52e X-Filterd-Recvd-Size: 13661 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 3 Jun 2020 23:00:36 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6083F20C56; Wed, 3 Jun 2020 23:00:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591225235; bh=8yt4ZiV71GVzePK5OqF3teFT8lqNshAxEIykCeYaaEA=; h=Date:From:To:Subject:In-Reply-To:From; b=HDSVHSMRKMIBj2pRF2zsbzOGyferVBGVEu3nLd6mtVIZm0oVuDaPvym/ZDuw/97Q7 Lq+BKhKfAR8akwiV/9zRDQQdD/BvUFwXnq6ezfb3npoDRQwqGikAmMqTiOoxGE3dGn SE+CeVTky1OudHdHbAyF48BI9Gik5aHqSGQuQNIg= Date: Wed, 03 Jun 2020 16:00:34 -0700 From: Andrew Morton To: akpm@linux-foundation.org, almasrymina@google.com, anders.roxell@linaro.org, aneesh.kumar@linux.ibm.com, aou@eecs.berkeley.edu, benh@kernel.crashing.org, borntraeger@de.ibm.com, cai@lca.pw, catalin.marinas@arm.com, christophe.leroy@c-s.fr, corbet@lwn.net, dave.hansen@linux.intel.com, davem@davemloft.net, gerald.schaefer@de.ibm.com, gor@linux.ibm.com, heiko.carstens@de.ibm.com, linux-mm@kvack.org, longpeng2@huawei.com, mike.kravetz@oracle.com, mingo@redhat.com, mm-commits@vger.kernel.org, nitesh@redhat.com, palmer@dabbelt.com, paul.walmsley@sifive.com, paulus@samba.org, peterx@redhat.com, rdunlap@infradead.org, sfr@canb.auug.org.au, tglx@linutronix.de, torvalds@linux-foundation.org, will@kernel.org Subject: [patch 069/131] hugetlbfs: add arch_hugetlb_valid_size Message-ID: <20200603230034.71SYLN5lu%akpm@linux-foundation.org> In-Reply-To: <20200603155549.e041363450869eaae4c7f05b@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: A078F1819E764 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Mike Kravetz Subject: hugetlbfs: add arch_hugetlb_valid_size Patch series "Clean up hugetlb boot command line processing", v4. Longpeng(Mike) reported a weird message from hugetlb command line processing and proposed a solution [1]. While the proposed patch does address the specific issue, there are other related issues in command line processing. As hugetlbfs evolved, updates to command line processing have been made to meet immediate needs and not necessarily in a coordinated manner. The result is that some processing is done in arch specific code, some is done in arch independent code and coordination is problematic. Semantics can vary between architectures. The patch series does the following: - Define arch specific arch_hugetlb_valid_size routine used to validate passed huge page sizes. - Move hugepagesz= command line parsing out of arch specific code and into an arch independent routine. - Clean up command line processing to follow desired semantics and document those semantics. [1] https://lore.kernel.org/linux-mm/20200305033014.1152-1-longpeng2@huawei.com This patch (of 3): The architecture independent routine hugetlb_default_setup sets up the default huge pages size. It has no way to verify if the passed value is valid, so it accepts it and attempts to validate at a later time. This requires undocumented cooperation between the arch specific and arch independent code. For architectures that support more than one huge page size, provide a routine arch_hugetlb_valid_size to validate a huge page size. hugetlb_default_setup can use this to validate passed values. arch_hugetlb_valid_size will also be used in a subsequent patch to move processing of the "hugepagesz=" in arch specific code to a common routine in arch independent code. Link: http://lkml.kernel.org/r/20200428205614.246260-1-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200428205614.246260-2-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200417185049.275845-1-mike.kravetz@oracle.com Link: http://lkml.kernel.org/r/20200417185049.275845-2-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz Acked-by: Gerald Schaefer [s390] Acked-by: Will Deacon Cc: Catalin Marinas Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: David S. Miller Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Dave Hansen Cc: Jonathan Corbet Cc: Longpeng Cc: Christophe Leroy Cc: Randy Dunlap Cc: Mina Almasry Cc: Peter Xu Cc: Nitesh Narayan Lal Cc: Anders Roxell Cc: "Aneesh Kumar K.V" Cc: Qian Cai Cc: Stephen Rothwell Signed-off-by: Andrew Morton --- arch/arm64/mm/hugetlbpage.c | 17 +++++++++++++---- arch/powerpc/mm/hugetlbpage.c | 20 +++++++++++++------- arch/riscv/mm/hugetlbpage.c | 26 +++++++++++++++++--------- arch/s390/mm/hugetlbpage.c | 16 ++++++++++++---- arch/sparc/mm/init_64.c | 24 ++++++++++++++++-------- arch/x86/mm/hugetlbpage.c | 17 +++++++++++++---- include/linux/hugetlb.h | 1 + mm/hugetlb.c | 21 ++++++++++++++++++--- 8 files changed, 103 insertions(+), 39 deletions(-) --- a/arch/arm64/mm/hugetlbpage.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/arm64/mm/hugetlbpage.c @@ -464,17 +464,26 @@ static int __init hugetlbpage_init(void) } arch_initcall(hugetlbpage_init); -static __init int setup_hugepagesz(char *opt) +bool __init arch_hugetlb_valid_size(unsigned long size) { - unsigned long ps = memparse(opt, &opt); - - switch (ps) { + switch (size) { #ifdef CONFIG_ARM64_4K_PAGES case PUD_SIZE: #endif case CONT_PMD_SIZE: case PMD_SIZE: case CONT_PTE_SIZE: + return true; + } + + return false; +} + +static __init int setup_hugepagesz(char *opt) +{ + unsigned long ps = memparse(opt, &opt); + + if (arch_hugetlb_valid_size(ps)) { add_huge_page_size(ps); return 1; } --- a/arch/powerpc/mm/hugetlbpage.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/powerpc/mm/hugetlbpage.c @@ -558,7 +558,7 @@ unsigned long vma_mmu_pagesize(struct vm return vma_kernel_pagesize(vma); } -static int __init add_huge_page_size(unsigned long long size) +bool __init arch_hugetlb_valid_size(unsigned long size) { int shift = __ffs(size); int mmu_psize; @@ -566,20 +566,26 @@ static int __init add_huge_page_size(uns /* Check that it is a page size supported by the hardware and * that it fits within pagetable and slice limits. */ if (size <= PAGE_SIZE || !is_power_of_2(size)) - return -EINVAL; + return false; mmu_psize = check_and_get_huge_psize(shift); if (mmu_psize < 0) - return -EINVAL; + return false; BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); - /* Return if huge page size has already been setup */ - if (size_to_hstate(size)) - return 0; + return true; +} - hugetlb_add_hstate(shift - PAGE_SHIFT); +static int __init add_huge_page_size(unsigned long long size) +{ + int shift = __ffs(size); + + if (!arch_hugetlb_valid_size((unsigned long)size)) + return -EINVAL; + if (!size_to_hstate(size)) + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } --- a/arch/riscv/mm/hugetlbpage.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/riscv/mm/hugetlbpage.c @@ -12,21 +12,29 @@ int pmd_huge(pmd_t pmd) return pmd_leaf(pmd); } +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (size == HPAGE_SIZE) + return true; + else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long ps = memparse(opt, &opt); - if (ps == HPAGE_SIZE) { - hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); - } else if (IS_ENABLED(CONFIG_64BIT) && ps == PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); - return 0; + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); + return 1; } - return 1; + hugetlb_bad_size(); + pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); + return 0; + } __setup("hugepagesz=", setup_hugepagesz); --- a/arch/s390/mm/hugetlbpage.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/s390/mm/hugetlbpage.c @@ -254,16 +254,24 @@ follow_huge_pud(struct mm_struct *mm, un return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); } +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) + return true; + else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long size; char *string = opt; size = memparse(opt, &opt); - if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + if (arch_hugetlb_valid_size(size)) { + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); } else { hugetlb_bad_size(); pr_err("hugepagesz= specifies an unsupported page size %s\n", --- a/arch/sparc/mm/init_64.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/sparc/mm/init_64.c @@ -360,16 +360,11 @@ static void __init pud_huge_patch(void) __asm__ __volatile__("flush %0" : : "r" (addr)); } -static int __init setup_hugepagesz(char *string) +bool __init arch_hugetlb_valid_size(unsigned long size) { - unsigned long long hugepage_size; - unsigned int hugepage_shift; + unsigned int hugepage_shift = ilog2(size); unsigned short hv_pgsz_idx; unsigned int hv_pgsz_mask; - int rc = 0; - - hugepage_size = memparse(string, &string); - hugepage_shift = ilog2(hugepage_size); switch (hugepage_shift) { case HPAGE_16GB_SHIFT: @@ -397,7 +392,20 @@ static int __init setup_hugepagesz(char hv_pgsz_mask = 0; } - if ((hv_pgsz_mask & cpu_pgsz_mask) == 0U) { + if ((hv_pgsz_mask & cpu_pgsz_mask) == 0U) + return false; + + return true; +} + +static int __init setup_hugepagesz(char *string) +{ + unsigned long long hugepage_size; + int rc = 0; + + hugepage_size = memparse(string, &string); + + if (!arch_hugetlb_valid_size((unsigned long)hugepage_size)) { hugetlb_bad_size(); pr_err("hugepagesz=%llu not supported by MMU.\n", hugepage_size); --- a/arch/x86/mm/hugetlbpage.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/arch/x86/mm/hugetlbpage.c @@ -181,13 +181,22 @@ get_unmapped_area: #endif /* CONFIG_HUGETLB_PAGE */ #ifdef CONFIG_X86_64 +bool __init arch_hugetlb_valid_size(unsigned long size) +{ + if (size == PMD_SIZE) + return true; + else if (size == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { unsigned long ps = memparse(opt, &opt); - if (ps == PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); } else { hugetlb_bad_size(); printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", --- a/include/linux/hugetlb.h~hugetlbfs-add-arch_hugetlb_valid_size +++ a/include/linux/hugetlb.h @@ -521,6 +521,7 @@ int __init alloc_bootmem_huge_page(struc void __init hugetlb_bad_size(void); void __init hugetlb_add_hstate(unsigned order); +bool __init arch_hugetlb_valid_size(unsigned long size); struct hstate *size_to_hstate(unsigned long size); #ifndef HUGE_MAX_HSTATE --- a/mm/hugetlb.c~hugetlbfs-add-arch_hugetlb_valid_size +++ a/mm/hugetlb.c @@ -3256,6 +3256,12 @@ static int __init hugetlb_init(void) } subsys_initcall(hugetlb_init); +/* Overwritten by architectures with more huge page sizes */ +bool __init __attribute((weak)) arch_hugetlb_valid_size(unsigned long size) +{ + return size == HPAGE_SIZE; +} + /* Should be called on processing a hugepagesz=... option */ void __init hugetlb_bad_size(void) { @@ -3331,12 +3337,21 @@ static int __init hugetlb_nrpages_setup( } __setup("hugepages=", hugetlb_nrpages_setup); -static int __init hugetlb_default_setup(char *s) +static int __init default_hugepagesz_setup(char *s) { - default_hstate_size = memparse(s, &s); + unsigned long size; + + size = (unsigned long)memparse(s, NULL); + + if (!arch_hugetlb_valid_size(size)) { + pr_err("HugeTLB: unsupported default_hugepagesz %s\n", s); + return 0; + } + + default_hstate_size = size; return 1; } -__setup("default_hugepagesz=", hugetlb_default_setup); +__setup("default_hugepagesz=", default_hugepagesz_setup); static unsigned int cpuset_mems_nr(unsigned int *array) { _