diff options
Diffstat (limited to 'arch/s390/mm')
-rw-r--r-- | arch/s390/mm/gmap.c | 3 | ||||
-rw-r--r-- | arch/s390/mm/gup.c | 45 | ||||
-rw-r--r-- | arch/s390/mm/hugetlbpage.c | 129 | ||||
-rw-r--r-- | arch/s390/mm/pgtable.c | 39 |
4 files changed, 176 insertions, 40 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index cace818..69466f6 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -430,6 +430,9 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr) VM_BUG_ON(pgd_none(*pgd)); pud = pud_offset(pgd, vmaddr); VM_BUG_ON(pud_none(*pud)); + /* large puds cannot yet be handled */ + if (pud_large(*pud)) + return -EFAULT; pmd = pmd_offset(pud, vmaddr); VM_BUG_ON(pmd_none(*pmd)); /* large pmds cannot yet be handled */ diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c index a8a6765..adb0c34 100644 --- a/arch/s390/mm/gup.c +++ b/arch/s390/mm/gup.c @@ -128,6 +128,44 @@ static inline int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr, return 1; } +static int gup_huge_pud(pud_t *pudp, pud_t pud, unsigned long addr, + unsigned long end, int write, struct page **pages, int *nr) +{ + struct page *head, *page; + unsigned long mask; + int refs; + + mask = (write ? _REGION_ENTRY_PROTECT : 0) | _REGION_ENTRY_INVALID; + if ((pud_val(pud) & mask) != 0) + return 0; + VM_BUG_ON(!pfn_valid(pud_pfn(pud))); + + refs = 0; + head = pud_page(pud); + page = head + ((addr & ~PUD_MASK) >> PAGE_SHIFT); + do { + VM_BUG_ON_PAGE(compound_head(page) != head, page); + pages[*nr] = page; + (*nr)++; + page++; + refs++; + } while (addr += PAGE_SIZE, addr != end); + + if (!page_cache_add_speculative(head, refs)) { + *nr -= refs; + return 0; + } + + if (unlikely(pud_val(pud) != pud_val(*pudp))) { + *nr -= refs; + while (refs--) + put_page(head); + return 0; + } + + return 1; +} + static inline int gup_pud_range(pgd_t *pgdp, pgd_t pgd, unsigned long addr, unsigned long end, int write, struct page **pages, int *nr) { @@ -144,7 +182,12 @@ static inline int gup_pud_range(pgd_t *pgdp, pgd_t pgd, unsigned long addr, next = pud_addr_end(addr, end); if (pud_none(pud)) return 0; - if (!gup_pmd_range(pudp, pud, addr, next, write, pages, nr)) + if (unlikely(pud_large(pud))) { + if (!gup_huge_pud(pudp, pud, addr, next, write, pages, + nr)) + return 0; + } else if (!gup_pmd_range(pudp, pud, addr, next, write, pages, + nr)) return 0; } while (pudp++, addr = next, addr != end); diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index 1b5e898..e19d853 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -1,19 +1,22 @@ /* * IBM System z Huge TLB Page Support for Kernel. * - * Copyright IBM Corp. 2007 + * Copyright IBM Corp. 2007,2016 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com> */ +#define KMSG_COMPONENT "hugetlb" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + #include <linux/mm.h> #include <linux/hugetlb.h> -static inline pmd_t __pte_to_pmd(pte_t pte) +static inline unsigned long __pte_to_rste(pte_t pte) { - pmd_t pmd; + unsigned long rste; /* - * Convert encoding pte bits pmd bits + * Convert encoding pte bits pmd / pud bits * lIR.uswrdy.p dy..R...I...wr * empty 010.000000.0 -> 00..0...1...00 * prot-none, clean, old 111.000000.1 -> 00..1...1...00 @@ -33,25 +36,31 @@ static inline pmd_t __pte_to_pmd(pte_t pte) * u unused, l large */ if (pte_present(pte)) { - pmd_val(pmd) = pte_val(pte) & PAGE_MASK; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_READ) >> 4; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_WRITE) >> 4; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_INVALID) >> 5; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_PROTECT); - pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10; - pmd_val(pmd) |= (pte_val(pte) & _PAGE_SOFT_DIRTY) << 13; + rste = pte_val(pte) & PAGE_MASK; + rste |= (pte_val(pte) & _PAGE_READ) >> 4; + rste |= (pte_val(pte) & _PAGE_WRITE) >> 4; + rste |= (pte_val(pte) & _PAGE_INVALID) >> 5; + rste |= (pte_val(pte) & _PAGE_PROTECT); + rste |= (pte_val(pte) & _PAGE_DIRTY) << 10; + rste |= (pte_val(pte) & _PAGE_YOUNG) << 10; + rste |= (pte_val(pte) & _PAGE_SOFT_DIRTY) << 13; } else - pmd_val(pmd) = _SEGMENT_ENTRY_INVALID; - return pmd; + rste = _SEGMENT_ENTRY_INVALID; + return rste; } -static inline pte_t __pmd_to_pte(pmd_t pmd) +static inline pte_t __rste_to_pte(unsigned long rste) { + int present; pte_t pte; + if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) + present = pud_present(__pud(rste)); + else + present = pmd_present(__pmd(rste)); + /* - * Convert encoding pmd bits pte bits + * Convert encoding pmd / pud bits pte bits * dy..R...I...wr lIR.uswrdy.p * empty 00..0...1...00 -> 010.000000.0 * prot-none, clean, old 00..1...1...00 -> 111.000000.1 @@ -70,16 +79,16 @@ static inline pte_t __pmd_to_pte(pmd_t pmd) * SW-bits: p present, y young, d dirty, r read, w write, s special, * u unused, l large */ - if (pmd_present(pmd)) { - pte_val(pte) = pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN_LARGE; + if (present) { + pte_val(pte) = rste & _SEGMENT_ENTRY_ORIGIN_LARGE; pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_READ) << 4; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) << 4; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) << 5; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT); - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) >> 10; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) >> 10; - pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY) >> 13; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_READ) << 4; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_WRITE) << 4; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_INVALID) << 5; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_PROTECT); + pte_val(pte) |= (rste & _SEGMENT_ENTRY_DIRTY) >> 10; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_YOUNG) >> 10; + pte_val(pte) |= (rste & _SEGMENT_ENTRY_SOFT_DIRTY) >> 13; } else pte_val(pte) = _PAGE_INVALID; return pte; @@ -88,27 +97,33 @@ static inline pte_t __pmd_to_pte(pmd_t pmd) void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { - pmd_t pmd = __pte_to_pmd(pte); - - pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE; - *(pmd_t *) ptep = pmd; + unsigned long rste = __pte_to_rste(pte); + + /* Set correct table type for 2G hugepages */ + if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) + rste |= _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE; + else + rste |= _SEGMENT_ENTRY_LARGE; + pte_val(*ptep) = rste; } pte_t huge_ptep_get(pte_t *ptep) { - pmd_t pmd = *(pmd_t *) ptep; - - return __pmd_to_pte(pmd); + return __rste_to_pte(pte_val(*ptep)); } pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { + pte_t pte = huge_ptep_get(ptep); pmd_t *pmdp = (pmd_t *) ptep; - pmd_t old; + pud_t *pudp = (pud_t *) ptep; - old = pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); - return __pmd_to_pte(old); + if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) + pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY)); + else + pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); + return pte; } pte_t *huge_pte_alloc(struct mm_struct *mm, @@ -120,8 +135,12 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, pgdp = pgd_offset(mm, addr); pudp = pud_alloc(mm, pgdp, addr); - if (pudp) - pmdp = pmd_alloc(mm, pudp, addr); + if (pudp) { + if (sz == PUD_SIZE) + return (pte_t *) pudp; + else if (sz == PMD_SIZE) + pmdp = pmd_alloc(mm, pudp, addr); + } return (pte_t *) pmdp; } @@ -134,8 +153,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) pgdp = pgd_offset(mm, addr); if (pgd_present(*pgdp)) { pudp = pud_offset(pgdp, addr); - if (pud_present(*pudp)) + if (pud_present(*pudp)) { + if (pud_large(*pudp)) + return (pte_t *) pudp; pmdp = pmd_offset(pudp, addr); + } } return (pte_t *) pmdp; } @@ -147,5 +169,34 @@ int pmd_huge(pmd_t pmd) int pud_huge(pud_t pud) { - return 0; + return pud_large(pud); +} + +struct page * +follow_huge_pud(struct mm_struct *mm, unsigned long address, + pud_t *pud, int flags) +{ + if (flags & FOLL_GET) + return NULL; + + return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); +} + +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); + } else { + pr_err("hugepagesz= specifies an unsupported page size %s\n", + string); + return 0; + } + return 1; } +__setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 74f8f2a..b98d1a1 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -352,6 +352,45 @@ pmd_t pmdp_xchg_lazy(struct mm_struct *mm, unsigned long addr, } EXPORT_SYMBOL(pmdp_xchg_lazy); +static inline pud_t pudp_flush_direct(struct mm_struct *mm, + unsigned long addr, pud_t *pudp) +{ + pud_t old; + + old = *pudp; + if (pud_val(old) & _REGION_ENTRY_INVALID) + return old; + if (!MACHINE_HAS_IDTE) { + /* + * Invalid bit position is the same for pmd and pud, so we can + * re-use _pmd_csp() here + */ + __pmdp_csp((pmd_t *) pudp); + return old; + } + atomic_inc(&mm->context.flush_count); + if (MACHINE_HAS_TLB_LC && + cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) + __pudp_idte_local(addr, pudp); + else + __pudp_idte(addr, pudp); + atomic_dec(&mm->context.flush_count); + return old; +} + +pud_t pudp_xchg_direct(struct mm_struct *mm, unsigned long addr, + pud_t *pudp, pud_t new) +{ + pud_t old; + + preempt_disable(); + old = pudp_flush_direct(mm, addr, pudp); + *pudp = new; + preempt_enable(); + return old; +} +EXPORT_SYMBOL(pudp_xchg_direct); + #ifdef CONFIG_TRANSPARENT_HUGEPAGE void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable) |