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Fri, 17 Apr 2020 18:51:09 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 30emerj3e9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 18:51:09 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 03HIox04025273; Fri, 17 Apr 2020 18:50:59 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Apr 2020 11:50:59 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v3 1/4] hugetlbfs: add arch_hugetlb_valid_size Date: Fri, 17 Apr 2020 11:50:46 -0700 Message-Id: <20200417185049.275845-2-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200417185049.275845-1-mike.kravetz@oracle.com> References: <20200417185049.275845-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 clxscore=1011 malwarescore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 phishscore=0 spamscore=0 impostorscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Heiko Carstens , Peter Xu , Paul Mackerras , Will Deacon , Mina Almasry , Jonathan Corbet , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Longpeng , Albert Ou , Vasily Gorbik , Paul Walmsley , Thomas Gleixner , Nitesh Narayan Lal , Randy Dunlap , Palmer Dabbelt , Andrew Morton , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. Signed-off-by: Mike Kravetz --- 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(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index bbeb6a5a6ba6..069b96ee2aec 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -462,17 +462,26 @@ 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; } diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 33b3461d91e8..de54d2a37830 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -558,7 +558,7 @@ unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) 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(unsigned long long size) /* 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; } diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index a6189ed36c5f..da1f516bc451 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/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); diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index f01daddcbc5e..ac25b207624c 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -251,16 +251,24 @@ follow_huge_pud(struct mm_struct *mm, unsigned long address, 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", diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 1cf0d666dea3..2bfe8e22b706 100644 --- a/arch/sparc/mm/init_64.c +++ b/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 *string) 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); diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 5bfd5aef5378..1c4372bfe782 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -181,13 +181,22 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, #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", diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 43a1cef8f0f1..2eb15f5ab01e 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -521,6 +521,7 @@ int __init alloc_bootmem_huge_page(struct hstate *h); 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 diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cd459155d28a..871ac1681f37 100644 --- a/mm/hugetlb.c +++ b/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(char *s) } __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) { From patchwork Fri Apr 17 18:50:47 2020 Content-Type: text/plain; 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Fri, 17 Apr 2020 18:51:09 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3020.oracle.com with ESMTP id 30dn9ks84c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 18:51:09 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 03HIp4un029040; Fri, 17 Apr 2020 18:51:04 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Apr 2020 11:51:03 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v3 2/4] hugetlbfs: move hugepagesz= parsing to arch independent code Date: Fri, 17 Apr 2020 11:50:47 -0700 Message-Id: <20200417185049.275845-3-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200417185049.275845-1-mike.kravetz@oracle.com> References: <20200417185049.275845-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 mlxscore=0 adultscore=0 spamscore=0 phishscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 clxscore=1015 impostorscore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Heiko Carstens , Peter Xu , Paul Mackerras , Will Deacon , Mina Almasry , Jonathan Corbet , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Longpeng , Albert Ou , Vasily Gorbik , Paul Walmsley , Thomas Gleixner , Nitesh Narayan Lal , Randy Dunlap , Palmer Dabbelt , Andrew Morton , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Now that architectures provide arch_hugetlb_valid_size(), parsing of "hugepagesz=" can be done in architecture independent code. Create a single routine to handle hugepagesz= parsing and remove all arch specific routines. We can also remove the interface hugetlb_bad_size() as this is no longer used outside arch independent code. This also provides consistent behavior of hugetlbfs command line options. The hugepagesz= option should only be specified once for a specific size, but some architectures allow multiple instances. This appears to be more of an oversight when code was added by some architectures to set up ALL huge pages sizes. Signed-off-by: Mike Kravetz Acked-by: Mina Almasry Reviewed-by: Peter Xu Signed-off-by: Mike Kravetz Tested-by: Sandipan Das --- arch/arm64/mm/hugetlbpage.c | 15 --------------- arch/powerpc/mm/hugetlbpage.c | 15 --------------- arch/riscv/mm/hugetlbpage.c | 16 ---------------- arch/s390/mm/hugetlbpage.c | 18 ------------------ arch/sparc/mm/init_64.c | 22 ---------------------- arch/x86/mm/hugetlbpage.c | 16 ---------------- include/linux/hugetlb.h | 1 - mm/hugetlb.c | 23 +++++++++++++++++------ 8 files changed, 17 insertions(+), 109 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 069b96ee2aec..f706b821aba6 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -476,18 +476,3 @@ bool __init arch_hugetlb_valid_size(unsigned long size) 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; - } - - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10); - return 0; -} -__setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index de54d2a37830..2c3fa0a7787b 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -589,21 +589,6 @@ static int __init add_huge_page_size(unsigned long long size) return 0; } -static int __init hugepage_setup_sz(char *str) -{ - unsigned long long size; - - size = memparse(str, &str); - - if (add_huge_page_size(size) != 0) { - hugetlb_bad_size(); - pr_err("Invalid huge page size specified(%llu)\n", size); - } - - return 1; -} -__setup("hugepagesz=", hugepage_setup_sz); - static int __init hugetlbpage_init(void) { bool configured = false; diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index da1f516bc451..4e5d7e9f0eef 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -22,22 +22,6 @@ bool __init arch_hugetlb_valid_size(unsigned long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long ps = memparse(opt, &opt); - - if (arch_hugetlb_valid_size(ps)) { - hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); - return 1; - } - - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); - return 0; - -} -__setup("hugepagesz=", setup_hugepagesz); - #ifdef CONFIG_CONTIG_ALLOC static __init int gigantic_pages_init(void) { diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index ac25b207624c..242dfc0d462d 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -261,24 +261,6 @@ bool __init arch_hugetlb_valid_size(unsigned long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long size; - char *string = opt; - - size = memparse(opt, &opt); - 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", - string); - return 0; - } - return 1; -} -__setup("hugepagesz=", setup_hugepagesz); - static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 2bfe8e22b706..4618f96fd30f 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -397,28 +397,6 @@ bool __init arch_hugetlb_valid_size(unsigned long size) 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); - goto out; - } - - add_huge_page_size(hugepage_size); - rc = 1; - -out: - return rc; -} -__setup("hugepagesz=", setup_hugepagesz); #endif /* CONFIG_HUGETLB_PAGE */ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 1c4372bfe782..937d640a89e3 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -191,22 +191,6 @@ bool __init arch_hugetlb_valid_size(unsigned long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long ps = memparse(opt, &opt); - - 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", - ps >> 20); - return 0; - } - return 1; -} -__setup("hugepagesz=", setup_hugepagesz); - #ifdef CONFIG_CONTIG_ALLOC static __init int gigantic_pages_init(void) { diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 2eb15f5ab01e..0c13706054ef 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -519,7 +519,6 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping, int __init __alloc_bootmem_huge_page(struct hstate *h); int __init alloc_bootmem_huge_page(struct hstate *h); -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); diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 871ac1681f37..b2d276408cec 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3262,12 +3262,6 @@ 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) -{ - parsed_valid_hugepagesz = false; -} - void __init hugetlb_add_hstate(unsigned int order) { struct hstate *h; @@ -3337,6 +3331,23 @@ static int __init hugetlb_nrpages_setup(char *s) } __setup("hugepages=", hugetlb_nrpages_setup); +static int __init hugepagesz_setup(char *s) +{ + unsigned long size; + + size = (unsigned long)memparse(s, NULL); + + if (!arch_hugetlb_valid_size(size)) { + parsed_valid_hugepagesz = false; + pr_err("HugeTLB: unsupported hugepagesz %s\n", s); + return 0; + } + + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); + return 1; +} +__setup("hugepagesz=", hugepagesz_setup); + static int __init default_hugepagesz_setup(char *s) { unsigned long size; 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Fri, 17 Apr 2020 18:51:22 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 30dn921b15-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 18:51:22 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 03HIp7Ev029062; Fri, 17 Apr 2020 18:51:07 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Apr 2020 11:51:07 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v3 3/4] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate Date: Fri, 17 Apr 2020 11:50:48 -0700 Message-Id: <20200417185049.275845-4-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200417185049.275845-1-mike.kravetz@oracle.com> References: <20200417185049.275845-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170143 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 clxscore=1015 malwarescore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 phishscore=0 spamscore=0 impostorscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Heiko Carstens , Peter Xu , Paul Mackerras , Will Deacon , Mina Almasry , Jonathan Corbet , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Longpeng , Albert Ou , Vasily Gorbik , Paul Walmsley , Thomas Gleixner , Nitesh Narayan Lal , Randy Dunlap , Palmer Dabbelt , Andrew Morton , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The routine hugetlb_add_hstate prints a warning if the hstate already exists. This was originally done as part of kernel command line parsing. If 'hugepagesz=' was specified more than once, the warning pr_warn("hugepagesz= specified twice, ignoring\n"); would be printed. Some architectures want to enable all huge page sizes. They would call hugetlb_add_hstate for all supported sizes. However, this was done after command line processing and as a result hstates could have already been created for some sizes. To make sure no warning were printed, there would often be code like: if (!size_to_hstate(size) hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT) The only time we want to print the warning is as the result of command line processing. So, remove the warning from hugetlb_add_hstate and add it to the single arch independent routine processing "hugepagesz=". After this, calls to size_to_hstate() in arch specific code can be removed and hugetlb_add_hstate can be called without worrying about warning messages. Signed-off-by: Mike Kravetz Acked-by: Mina Almasry --- arch/arm64/mm/hugetlbpage.c | 16 ++++------------ arch/powerpc/mm/hugetlbpage.c | 3 +-- arch/riscv/mm/hugetlbpage.c | 2 +- arch/sparc/mm/init_64.c | 19 ++++--------------- arch/x86/mm/hugetlbpage.c | 2 +- mm/hugetlb.c | 9 ++++++--- 6 files changed, 17 insertions(+), 34 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index f706b821aba6..21fa98b51e00 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -441,22 +441,14 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma, clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig); } -static void __init add_huge_page_size(unsigned long size) -{ - if (size_to_hstate(size)) - return; - - hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); -} - static int __init hugetlbpage_init(void) { #ifdef CONFIG_ARM64_4K_PAGES - add_huge_page_size(PUD_SIZE); + hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); #endif - add_huge_page_size(CONT_PMD_SIZE); - add_huge_page_size(PMD_SIZE); - add_huge_page_size(CONT_PTE_SIZE); + hugetlb_add_hstate(CONT_PMD_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(CONT_PTE_SHIFT - PAGE_SHIFT); return 0; } diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 2c3fa0a7787b..4d5ed1093615 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -584,8 +584,7 @@ static int __init add_huge_page_size(unsigned long long size) if (!arch_hugetlb_valid_size((unsigned long)size)) return -EINVAL; - if (!size_to_hstate(size)) - hugetlb_add_hstate(shift - PAGE_SHIFT); + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index 4e5d7e9f0eef..932dadfdca54 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -26,7 +26,7 @@ bool __init arch_hugetlb_valid_size(unsigned long size) static __init int gigantic_pages_init(void) { /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ - if (IS_ENABLED(CONFIG_64BIT) && !size_to_hstate(1UL << PUD_SHIFT)) + if (IS_ENABLED(CONFIG_64BIT)) hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); return 0; } diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 4618f96fd30f..ae819a16d07a 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -325,23 +325,12 @@ static void __update_mmu_tsb_insert(struct mm_struct *mm, unsigned long tsb_inde } #ifdef CONFIG_HUGETLB_PAGE -static void __init add_huge_page_size(unsigned long size) -{ - unsigned int order; - - if (size_to_hstate(size)) - return; - - order = ilog2(size) - PAGE_SHIFT; - hugetlb_add_hstate(order); -} - static int __init hugetlbpage_init(void) { - add_huge_page_size(1UL << HPAGE_64K_SHIFT); - add_huge_page_size(1UL << HPAGE_SHIFT); - add_huge_page_size(1UL << HPAGE_256MB_SHIFT); - add_huge_page_size(1UL << HPAGE_2GB_SHIFT); + hugetlb_add_hstate(HPAGE_64K_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_256MB_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_2GB_SHIFT - PAGE_SHIFT); return 0; } diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 937d640a89e3..cf5781142716 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -195,7 +195,7 @@ bool __init arch_hugetlb_valid_size(unsigned long size) static __init int gigantic_pages_init(void) { /* With compaction or CMA we can allocate gigantic pages at runtime */ - if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT)) + if (boot_cpu_has(X86_FEATURE_GBPAGES)) hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); return 0; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index b2d276408cec..0e6eb755ae94 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3222,8 +3222,7 @@ static int __init hugetlb_init(void) } default_hstate_size = HPAGE_SIZE; - if (!size_to_hstate(default_hstate_size)) - hugetlb_add_hstate(HUGETLB_PAGE_ORDER); + hugetlb_add_hstate(HUGETLB_PAGE_ORDER); } default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); if (default_hstate_max_huge_pages) { @@ -3268,7 +3267,6 @@ void __init hugetlb_add_hstate(unsigned int order) unsigned long i; if (size_to_hstate(PAGE_SIZE << order)) { - pr_warn("hugepagesz= specified twice, ignoring\n"); return; } BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); @@ -3343,6 +3341,11 @@ static int __init hugepagesz_setup(char *s) return 0; } + if (size_to_hstate(size)) { + pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", s); + return 0; + } + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); return 1; } From patchwork Fri Apr 17 18:50:49 2020 Content-Type: text/plain; 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Fri, 17 Apr 2020 18:51:12 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 30emerj3gh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Apr 2020 18:51:12 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 03HIpAr9029082; Fri, 17 Apr 2020 18:51:10 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Apr 2020 11:51:10 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v3 4/4] hugetlbfs: clean up command line processing Date: Fri, 17 Apr 2020 11:50:49 -0700 Message-Id: <20200417185049.275845-5-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200417185049.275845-1-mike.kravetz@oracle.com> References: <20200417185049.275845-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9594 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 clxscore=1015 impostorscore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004170142 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Heiko Carstens , Peter Xu , Paul Mackerras , Will Deacon , Mina Almasry , Jonathan Corbet , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Longpeng , Albert Ou , Vasily Gorbik , Paul Walmsley , Thomas Gleixner , Nitesh Narayan Lal , Randy Dunlap , Palmer Dabbelt , Andrew Morton , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" With all hugetlb page processing done in a single file clean up code. - Make code match desired semantics - Update documentation with semantics - Make all warnings and errors messages start with 'HugeTLB:'. - Consistently name command line parsing routines. - Check for hugepages_supported() before processing parameters. - Add comments to code - Describe some of the subtle interactions - Describe semantics of command line arguments This patch also fixes issues with implicitly setting the number of gigantic huge pages to preallocate. Previously on X86 command line, hugepages=2 default_hugepagesz=1G would result in zero 1G pages being preallocated and, # grep HugePages_Total /proc/meminfo HugePages_Total: 0 # sysctl -a | grep nr_hugepages vm.nr_hugepages = 2 vm.nr_hugepages_mempolicy = 2 # cat /proc/sys/vm/nr_hugepages 2 After this patch 2 gigantic pages will be preallocated and all the proc, sysfs, sysctl and meminfo files will accurately reflect this. To address the issue with gigantic pages, a small change in behavior was made to command line processing. Previously the command line, hugepages=128 default_hugepagesz=2M hugepagesz=2M hugepages=256 would result in the allocation of 256 2M huge pages. The value 128 would be ignored without any warning. After this patch, 128 2M pages will be allocated and a warning message will be displayed indicating the value of 256 is ignored. This change in behavior is required because allocation of implicitly specified gigantic pages must be done when the default_hugepagesz= is encountered for gigantic pages. Previously the code waited until later in the boot process (hugetlb_init), to allocate pages of default size. However the bootmem allocator required for gigantic allocations is not available at this time. Signed-off-by: Mike Kravetz --- .../admin-guide/kernel-parameters.txt | 40 +++-- Documentation/admin-guide/mm/hugetlbpage.rst | 35 ++++ mm/hugetlb.c | 159 ++++++++++++++---- 3 files changed, 190 insertions(+), 44 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index f2a93c8679e8..8cd78cc87a1c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -834,12 +834,15 @@ See also Documentation/networking/decnet.txt. default_hugepagesz= - [same as hugepagesz=] The size of the default - HugeTLB page size. This is the size represented by - the legacy /proc/ hugepages APIs, used for SHM, and - default size when mounting hugetlbfs filesystems. - Defaults to the default architecture's huge page size - if not specified. + [HW] The size of the default HugeTLB page. This is + the size represented by the legacy /proc/ hugepages + APIs. In addition, this is the default hugetlb size + used for shmget(), mmap() and mounting hugetlbfs + filesystems. If not specified, defaults to the + architecture's default huge page size. Huge page + sizes are architecture dependent. See also + Documentation/admin-guide/mm/hugetlbpage.rst. + Format: size[KMG] deferred_probe_timeout= [KNL] Debugging option to set a timeout in seconds for @@ -1479,13 +1482,24 @@ hugepages using the cma allocator. If enabled, the boot-time allocation of gigantic hugepages is skipped. - hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot. - hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages. - On x86-64 and powerpc, this option can be specified - multiple times interleaved with hugepages= to reserve - huge pages of different sizes. Valid pages sizes on - x86-64 are 2M (when the CPU supports "pse") and 1G - (when the CPU supports the "pdpe1gb" cpuinfo flag). + hugepages= [HW] Number of HugeTLB pages to allocate at boot. + If this follows hugepagesz (below), it specifies + the number of pages of hugepagesz to be allocated. + If this is the first HugeTLB parameter on the command + line, it specifies the number of pages to allocate for + the default huge page size. See also + Documentation/admin-guide/mm/hugetlbpage.rst. + Format: + + hugepagesz= + [HW] The size of the HugeTLB pages. This is used in + conjunction with hugepages (above) to allocate huge + pages of a specific size at boot. The pair + hugepagesz=X hugepages=Y can be specified once for + each supported huge page size. Huge page sizes are + architecture dependent. See also + Documentation/admin-guide/mm/hugetlbpage.rst. + Format: size[KMG] hung_task_panic= [KNL] Should the hung task detector generate panics. diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst index 1cc0bc78d10e..5026e58826e2 100644 --- a/Documentation/admin-guide/mm/hugetlbpage.rst +++ b/Documentation/admin-guide/mm/hugetlbpage.rst @@ -100,6 +100,41 @@ with a huge page size selection parameter "hugepagesz=". must be specified in bytes with optional scale suffix [kKmMgG]. The default huge page size may be selected with the "default_hugepagesz=" boot parameter. +Hugetlb boot command line parameter semantics +hugepagesz - Specify a huge page size. Used in conjunction with hugepages + parameter to preallocate a number of huge pages of the specified + size. Hence, hugepagesz and hugepages are typically specified in + pairs such as: + hugepagesz=2M hugepages=512 + hugepagesz can only be specified once on the command line for a + specific huge page size. Valid huge page sizes are architecture + dependent. +hugepages - Specify the number of huge pages to preallocate. This typically + follows a valid hugepagesz or default_hugepagesz parameter. However, + if hugepages is the first or only hugetlb command line parameter it + implicitly specifies the number of huge pages of default size to + allocate. If the number of huge pages of default size is implicitly + specified, it can not be overwritten by a hugepagesz,hugepages + parameter pair for the default size. + For example, on an architecture with 2M default huge page size: + hugepages=256 hugepagesz=2M hugepages=512 + will result in 256 2M huge pages being allocated and a warning message + indicating that the hugepages=512 parameter is ignored. If a hugepages + parameter is preceded by an invalid hugepagesz parameter, it will + be ignored. +default_hugepagesz - Specify the default huge page size. This parameter can + only be specified once on the command line. default_hugepagesz can + optionally be followed by the hugepages parameter to preallocate a + specific number of huge pages of default size. The number of default + sized huge pages to preallocate can also be implicitly specified as + mentioned in the hugepages section above. Therefore, on an + architecture with 2M default huge page size: + hugepages=256 + default_hugepagesz=2M hugepages=256 + hugepages=256 default_hugepagesz=2M + will all result in 256 2M huge pages being allocated. Valid default + huge page size is architecture dependent. + When multiple huge page sizes are supported, ``/proc/sys/vm/nr_hugepages`` indicates the current number of pre-allocated huge pages of the default size. Thus, one can use the following command to dynamically allocate/deallocate diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 0e6eb755ae94..e272ebc2b5cb 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -59,8 +59,8 @@ __initdata LIST_HEAD(huge_boot_pages); /* for command line parsing */ static struct hstate * __initdata parsed_hstate; static unsigned long __initdata default_hstate_max_huge_pages; -static unsigned long __initdata default_hstate_size; static bool __initdata parsed_valid_hugepagesz = true; +static bool __initdata parsed_default_hugepagesz; /* * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages, @@ -3060,7 +3060,7 @@ static void __init hugetlb_sysfs_init(void) err = hugetlb_sysfs_add_hstate(h, hugepages_kobj, hstate_kobjs, &hstate_attr_group); if (err) - pr_err("Hugetlb: Unable to add hstate %s", h->name); + pr_err("HugeTLB: Unable to add hstate %s", h->name); } } @@ -3164,7 +3164,7 @@ static void hugetlb_register_node(struct node *node) nhs->hstate_kobjs, &per_node_hstate_attr_group); if (err) { - pr_err("Hugetlb: Unable to add hstate %s for node %d\n", + pr_err("HugeTLB: Unable to add hstate %s for node %d\n", h->name, node->dev.id); hugetlb_unregister_node(node); break; @@ -3215,19 +3215,35 @@ static int __init hugetlb_init(void) if (!hugepages_supported()) return 0; - if (!size_to_hstate(default_hstate_size)) { - if (default_hstate_size != 0) { - pr_err("HugeTLB: unsupported default_hugepagesz %lu. Reverting to %lu\n", - default_hstate_size, HPAGE_SIZE); + /* + * Make sure HPAGE_SIZE (HUGETLB_PAGE_ORDER) hstate exists. Some + * architectures depend on setup being done here. + */ + hugetlb_add_hstate(HUGETLB_PAGE_ORDER); + if (!parsed_default_hugepagesz) { + /* + * If we did not parse a default huge page size, set + * default_hstate_idx to HPAGE_SIZE hstate. And, if the + * number of huge pages for this default size was implicitly + * specified, set that here as well. + * Note that the implicit setting will overwrite an explicit + * setting. A warning will be printed in this case. + */ + default_hstate_idx = hstate_index(size_to_hstate(HPAGE_SIZE)); + if (default_hstate_max_huge_pages) { + if (default_hstate.max_huge_pages) { + char buf[32]; + + string_get_size(huge_page_size(&default_hstate), + 1, STRING_UNITS_2, buf, 32); + pr_warn("HugeTLB: Ignoring hugepages=%lu associated with %s page size\n", + default_hstate.max_huge_pages, buf); + pr_warn("HugeTLB: Using hugepages=%lu for number of default huge pages\n", + default_hstate_max_huge_pages); + } + default_hstate.max_huge_pages = + default_hstate_max_huge_pages; } - - default_hstate_size = HPAGE_SIZE; - hugetlb_add_hstate(HUGETLB_PAGE_ORDER); - } - default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); - if (default_hstate_max_huge_pages) { - if (!default_hstate.max_huge_pages) - default_hstate.max_huge_pages = default_hstate_max_huge_pages; } hugetlb_cma_check(); @@ -3287,20 +3303,34 @@ void __init hugetlb_add_hstate(unsigned int order) parsed_hstate = h; } -static int __init hugetlb_nrpages_setup(char *s) +/* + * hugepages command line processing + * hugepages normally follows a valid hugepagsz or default_hugepagsz + * specification. If not, ignore the hugepages value. hugepages can also + * be the first huge page command line option in which case it implicitly + * specifies the number of huge pages for the default size. + */ +static int __init hugepages_setup(char *s) { unsigned long *mhp; static unsigned long *last_mhp; + if (!hugepages_supported()) { + pr_warn("HugeTLB: huge pages not supported, ignoring hugepages = %s\n", s); + return 0; + } + if (!parsed_valid_hugepagesz) { - pr_warn("hugepages = %s preceded by " - "an unsupported hugepagesz, ignoring\n", s); + pr_warn("HugeTLB: hugepages=%s does not follow a valid hugepagesz, ignoring\n", s); parsed_valid_hugepagesz = true; - return 1; + return 0; } + /* - * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet, - * so this hugepages= parameter goes to the "default hstate". + * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter + * yet, so this hugepages= parameter goes to the "default hstate". + * Otherwise, it goes with the previously parsed hugepagesz or + * default_hugepagesz. */ else if (!hugetlb_max_hstate) mhp = &default_hstate_max_huge_pages; @@ -3308,8 +3338,8 @@ static int __init hugetlb_nrpages_setup(char *s) mhp = &parsed_hstate->max_huge_pages; if (mhp == last_mhp) { - pr_warn("hugepages= specified twice without interleaving hugepagesz=, ignoring\n"); - return 1; + pr_warn("HugeTLB: hugepages= specified twice without interleaving hugepagesz=, ignoring hugepages=%s\n", s); + return 0; } if (sscanf(s, "%lu", mhp) <= 0) @@ -3327,42 +3357,109 @@ static int __init hugetlb_nrpages_setup(char *s) return 1; } -__setup("hugepages=", hugetlb_nrpages_setup); +__setup("hugepages=", hugepages_setup); +/* + * hugepagesz command line processing + * A specific huge page size can only be specified once with hugepagesz. + * hugepagesz is followed by hugepages on the command line. The global + * variable 'parsed_valid_hugepagesz' is used to determine if prior + * hugepagesz argument was valid. + */ static int __init hugepagesz_setup(char *s) { unsigned long size; + struct hstate *h; + + parsed_valid_hugepagesz = false; + if (!hugepages_supported()) { + pr_warn("HugeTLB: huge pages not supported, ignoring hugepagesz = %s\n", s); + return 0; + } size = (unsigned long)memparse(s, NULL); if (!arch_hugetlb_valid_size(size)) { - parsed_valid_hugepagesz = false; - pr_err("HugeTLB: unsupported hugepagesz %s\n", s); + pr_err("HugeTLB: unsupported hugepagesz=%s\n", s); return 0; } - if (size_to_hstate(size)) { - pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", s); - return 0; + h = size_to_hstate(size); + if (h) { + /* + * hstate for this size already exists. This is normally + * an error, but is allowed if the existing hstate is the + * default hstate. More specifically, it is only allowed if + * the number of huge pages for the default hstate was not + * previously specified. + */ + if (!parsed_default_hugepagesz || h != &default_hstate || + default_hstate.max_huge_pages) { + pr_warn("HugeTLB: hugepagesz=%s specified twice, ignoring\n", s); + return 0; + } + + /* + * No need to call hugetlb_add_hstate() as hstate already + * exists. But, do set parsed_hstate so that a following + * hugepages= parameter will be applied to this hstate. + */ + parsed_hstate = h; + parsed_valid_hugepagesz = true; + return 1; } hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); + parsed_valid_hugepagesz = true; return 1; } __setup("hugepagesz=", hugepagesz_setup); +/* + * default_hugepagesz command line input + * Only one instance of default_hugepagesz allowed on command line. + */ static int __init default_hugepagesz_setup(char *s) { unsigned long size; + parsed_valid_hugepagesz = false; + if (!hugepages_supported()) { + pr_warn("HugeTLB: huge pages not supported, ignoring default_hugepagesz = %s\n", s); + return 0; + } + + if (parsed_default_hugepagesz) { + pr_err("HugeTLB: default_hugepagesz previously specified, ignoring %s\n", s); + return 0; + } + size = (unsigned long)memparse(s, NULL); if (!arch_hugetlb_valid_size(size)) { - pr_err("HugeTLB: unsupported default_hugepagesz %s\n", s); + pr_err("HugeTLB: unsupported default_hugepagesz=%s\n", s); return 0; } - default_hstate_size = size; + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); + parsed_valid_hugepagesz = true; + parsed_default_hugepagesz = true; + default_hstate_idx = hstate_index(size_to_hstate(size)); + + /* + * The number of default huge pages (for this size) could have been + * specified as the first hugetlb parameter: hugepages=X. If so, + * then default_hstate_max_huge_pages is set. If the default huge + * page size is gigantic (>= MAX_ORDER), then the pages must be + * allocated here from bootmem allocator. + */ + if (default_hstate_max_huge_pages) { + default_hstate.max_huge_pages = default_hstate_max_huge_pages; + if (hstate_is_gigantic(&default_hstate)) + hugetlb_hstate_alloc_pages(&default_hstate); + default_hstate_max_huge_pages = 0; + } + return 1; } __setup("default_hugepagesz=", default_hugepagesz_setup);