diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 208 |
1 files changed, 158 insertions, 50 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index f9a97320e1de..ac0d7bbc0692 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; @@ -3212,23 +3212,41 @@ static int __init hugetlb_init(void) { int i; - if (!hugepages_supported()) + if (!hugepages_supported()) { + if (hugetlb_max_hstate || default_hstate_max_huge_pages) + pr_warn("HugeTLB: huge pages not supported, ignoring associated command-line parameters\n"); 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; - if (!size_to_hstate(default_hstate_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(); @@ -3256,10 +3274,10 @@ static int __init hugetlb_init(void) } subsys_initcall(hugetlb_init); -/* Should be called on processing a hugepagesz=... option */ -void __init hugetlb_bad_size(void) +/* Overwritten by architectures with more huge page sizes */ +bool __init __attribute((weak)) arch_hugetlb_valid_size(unsigned long size) { - parsed_valid_hugepagesz = false; + return size == HPAGE_SIZE; } void __init hugetlb_add_hstate(unsigned int order) @@ -3268,7 +3286,6 @@ 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); @@ -3289,20 +3306,29 @@ 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 (!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; @@ -3310,8 +3336,8 @@ 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) @@ -3329,14 +3355,102 @@ static int __init hugetlb_nrpages_setup(char *s) return 1; } -__setup("hugepages=", hugetlb_nrpages_setup); +__setup("hugepages=", hugepages_setup); -static int __init hugetlb_default_setup(char *s) +/* + * 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) { - default_hstate_size = memparse(s, &s); + unsigned long size; + struct hstate *h; + + parsed_valid_hugepagesz = false; + size = (unsigned long)memparse(s, NULL); + + if (!arch_hugetlb_valid_size(size)) { + pr_err("HugeTLB: unsupported hugepagesz=%s\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("default_hugepagesz=", hugetlb_default_setup); +__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 (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); + return 0; + } + + 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); static unsigned int cpuset_mems_nr(unsigned int *array) { @@ -5354,8 +5468,8 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, * huge_pte_offset() - Walk the page table to resolve the hugepage * entry at address @addr * - * Return: Pointer to page table or swap entry (PUD or PMD) for - * address @addr, or NULL if a p*d_none() entry is encountered and the + * Return: Pointer to page table entry (PUD or PMD) for + * address @addr, or NULL if a !p*d_present() entry is encountered and the * size @sz doesn't match the hugepage size at this level of the page * table. */ @@ -5364,8 +5478,8 @@ pte_t *huge_pte_offset(struct mm_struct *mm, { pgd_t *pgd; p4d_t *p4d; - pud_t *pud, pud_entry; - pmd_t *pmd, pmd_entry; + pud_t *pud; + pmd_t *pmd; pgd = pgd_offset(mm, addr); if (!pgd_present(*pgd)) @@ -5375,22 +5489,16 @@ pte_t *huge_pte_offset(struct mm_struct *mm, return NULL; pud = pud_offset(p4d, addr); - pud_entry = READ_ONCE(*pud); - if (sz != PUD_SIZE && pud_none(pud_entry)) - return NULL; - /* hugepage or swap? */ - if (pud_huge(pud_entry) || !pud_present(pud_entry)) + if (sz == PUD_SIZE) + /* must be pud huge, non-present or none */ return (pte_t *)pud; - - pmd = pmd_offset(pud, addr); - pmd_entry = READ_ONCE(*pmd); - if (sz != PMD_SIZE && pmd_none(pmd_entry)) + if (!pud_present(*pud)) return NULL; - /* hugepage or swap? */ - if (pmd_huge(pmd_entry) || !pmd_present(pmd_entry)) - return (pte_t *)pmd; + /* must have a valid entry and size to go further */ - return NULL; + pmd = pmd_offset(pud, addr); + /* must be pmd huge, non-present or none */ + return (pte_t *)pmd; } #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ |