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s390/mm: add support for 2GB hugepages
This adds support for 2GB hugetlbfs pages on s390. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
Martin Schwidefsky
parent
46210c440c
commit
d08de8e2d8
@ -41,7 +41,10 @@ static inline int prepare_hugepage_range(struct file *file,
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static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
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else
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pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
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}
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static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
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@ -21,6 +21,7 @@
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define HUGE_MAX_HSTATE 2
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#define ARCH_HAS_SETCLEAR_HUGE_PTE
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#define ARCH_HAS_HUGE_PTE_TYPE
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@ -306,6 +306,9 @@ static inline int is_module_addr(void *addr)
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#define _REGION3_ENTRY_SOFT_DIRTY 0x0000 /* SW region soft dirty bit */
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#endif
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#define _REGION_ENTRY_BITS 0xfffffffffffff227UL
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#define _REGION_ENTRY_BITS_LARGE 0xffffffff8000fe27UL
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/* Bits in the segment table entry */
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#define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL
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#define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff0ff33UL
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@ -573,7 +576,7 @@ static inline int pud_none(pud_t pud)
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{
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if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
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return 0;
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return (pud_val(pud) & _REGION_ENTRY_INVALID) != 0UL;
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return pud_val(pud) == _REGION3_ENTRY_EMPTY;
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}
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static inline int pud_large(pud_t pud)
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@ -593,17 +596,25 @@ static inline unsigned long pud_pfn(pud_t pud)
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return (pud_val(pud) & origin_mask) >> PAGE_SHIFT;
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}
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static inline int pmd_large(pmd_t pmd)
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{
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return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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if (pmd_large(pmd))
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS_LARGE) != 0;
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
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}
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static inline int pud_bad(pud_t pud)
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{
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/*
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* With dynamic page table levels the pud can be a region table
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* entry or a segment table entry. Check for the bit that are
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* invalid for either table entry.
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*/
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unsigned long mask =
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~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INVALID &
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~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
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return (pud_val(pud) & mask) != 0;
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if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
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return pmd_bad(__pmd(pud_val(pud)));
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if (pud_large(pud))
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return (pud_val(pud) & ~_REGION_ENTRY_BITS_LARGE) != 0;
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return (pud_val(pud) & ~_REGION_ENTRY_BITS) != 0;
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}
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static inline int pmd_present(pmd_t pmd)
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@ -616,11 +627,6 @@ static inline int pmd_none(pmd_t pmd)
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return pmd_val(pmd) == _SEGMENT_ENTRY_INVALID;
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}
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static inline int pmd_large(pmd_t pmd)
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{
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return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
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}
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static inline unsigned long pmd_pfn(pmd_t pmd)
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{
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unsigned long origin_mask;
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@ -631,13 +637,6 @@ static inline unsigned long pmd_pfn(pmd_t pmd)
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return (pmd_val(pmd) & origin_mask) >> PAGE_SHIFT;
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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if (pmd_large(pmd))
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS_LARGE) != 0;
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
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}
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#define __HAVE_ARCH_PMD_WRITE
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static inline int pmd_write(pmd_t pmd)
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{
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@ -1081,6 +1080,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
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#define pud_page(pud) pfn_to_page(pud_pfn(pud))
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/* Find an entry in the lowest level page table.. */
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#define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
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@ -1238,6 +1238,19 @@ static inline void __pmdp_idte(unsigned long address, pmd_t *pmdp)
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: "cc" );
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}
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static inline void __pudp_idte(unsigned long address, pud_t *pudp)
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{
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unsigned long r3o;
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r3o = (unsigned long) pudp - pud_index(address) * sizeof(pud_t);
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r3o |= _ASCE_TYPE_REGION3;
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asm volatile(
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" .insn rrf,0xb98e0000,%2,%3,0,0"
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: "=m" (*pudp)
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: "m" (*pudp), "a" (r3o), "a" ((address & PUD_MASK))
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: "cc");
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}
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static inline void __pmdp_idte_local(unsigned long address, pmd_t *pmdp)
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{
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unsigned long sto;
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@ -1250,8 +1263,22 @@ static inline void __pmdp_idte_local(unsigned long address, pmd_t *pmdp)
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: "cc" );
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}
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static inline void __pudp_idte_local(unsigned long address, pud_t *pudp)
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{
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unsigned long r3o;
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r3o = (unsigned long) pudp - pud_index(address) * sizeof(pud_t);
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r3o |= _ASCE_TYPE_REGION3;
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asm volatile(
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" .insn rrf,0xb98e0000,%2,%3,0,1"
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: "=m" (*pudp)
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: "m" (*pudp), "a" (r3o), "a" ((address & PUD_MASK))
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: "cc");
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}
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pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
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pmd_t pmdp_xchg_lazy(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
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pud_t pudp_xchg_direct(struct mm_struct *, unsigned long, pud_t *, pud_t);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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@ -430,6 +430,9 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
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VM_BUG_ON(pgd_none(*pgd));
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pud = pud_offset(pgd, vmaddr);
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VM_BUG_ON(pud_none(*pud));
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/* large puds cannot yet be handled */
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if (pud_large(*pud))
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return -EFAULT;
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pmd = pmd_offset(pud, vmaddr);
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VM_BUG_ON(pmd_none(*pmd));
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/* large pmds cannot yet be handled */
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@ -128,6 +128,44 @@ static inline int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr,
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return 1;
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}
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static int gup_huge_pud(pud_t *pudp, pud_t pud, unsigned long addr,
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unsigned long end, int write, struct page **pages, int *nr)
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{
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struct page *head, *page;
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unsigned long mask;
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int refs;
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mask = (write ? _REGION_ENTRY_PROTECT : 0) | _REGION_ENTRY_INVALID;
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if ((pud_val(pud) & mask) != 0)
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return 0;
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VM_BUG_ON(!pfn_valid(pud_pfn(pud)));
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refs = 0;
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head = pud_page(pud);
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page = head + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
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do {
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VM_BUG_ON_PAGE(compound_head(page) != head, page);
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pages[*nr] = page;
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(*nr)++;
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page++;
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refs++;
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} while (addr += PAGE_SIZE, addr != end);
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if (!page_cache_add_speculative(head, refs)) {
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*nr -= refs;
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return 0;
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}
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if (unlikely(pud_val(pud) != pud_val(*pudp))) {
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*nr -= refs;
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while (refs--)
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put_page(head);
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return 0;
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}
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return 1;
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}
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static inline int gup_pud_range(pgd_t *pgdp, pgd_t pgd, unsigned long addr,
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unsigned long end, int write, struct page **pages, int *nr)
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{
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@ -144,7 +182,12 @@ static inline int gup_pud_range(pgd_t *pgdp, pgd_t pgd, unsigned long addr,
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next = pud_addr_end(addr, end);
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if (pud_none(pud))
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return 0;
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if (!gup_pmd_range(pudp, pud, addr, next, write, pages, nr))
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if (unlikely(pud_large(pud))) {
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if (!gup_huge_pud(pudp, pud, addr, next, write, pages,
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nr))
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return 0;
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} else if (!gup_pmd_range(pudp, pud, addr, next, write, pages,
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nr))
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return 0;
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} while (pudp++, addr = next, addr != end);
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@ -1,19 +1,22 @@
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/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2007
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* Copyright IBM Corp. 2007,2016
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#define KMSG_COMPONENT "hugetlb"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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static inline pmd_t __pte_to_pmd(pte_t pte)
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static inline unsigned long __pte_to_rste(pte_t pte)
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{
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pmd_t pmd;
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unsigned long rste;
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/*
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* Convert encoding pte bits pmd bits
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* Convert encoding pte bits pmd / pud bits
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* lIR.uswrdy.p dy..R...I...wr
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* empty 010.000000.0 -> 00..0...1...00
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* prot-none, clean, old 111.000000.1 -> 00..1...1...00
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@ -33,25 +36,31 @@ static inline pmd_t __pte_to_pmd(pte_t pte)
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* u unused, l large
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*/
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if (pte_present(pte)) {
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pmd_val(pmd) = pte_val(pte) & PAGE_MASK;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_READ) >> 4;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_WRITE) >> 4;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_INVALID) >> 5;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_PROTECT);
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10;
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pmd_val(pmd) |= (pte_val(pte) & _PAGE_SOFT_DIRTY) << 13;
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rste = pte_val(pte) & PAGE_MASK;
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rste |= (pte_val(pte) & _PAGE_READ) >> 4;
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rste |= (pte_val(pte) & _PAGE_WRITE) >> 4;
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rste |= (pte_val(pte) & _PAGE_INVALID) >> 5;
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rste |= (pte_val(pte) & _PAGE_PROTECT);
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rste |= (pte_val(pte) & _PAGE_DIRTY) << 10;
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rste |= (pte_val(pte) & _PAGE_YOUNG) << 10;
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rste |= (pte_val(pte) & _PAGE_SOFT_DIRTY) << 13;
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} else
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pmd_val(pmd) = _SEGMENT_ENTRY_INVALID;
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return pmd;
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rste = _SEGMENT_ENTRY_INVALID;
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return rste;
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}
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static inline pte_t __pmd_to_pte(pmd_t pmd)
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static inline pte_t __rste_to_pte(unsigned long rste)
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{
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int present;
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pte_t pte;
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if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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present = pud_present(__pud(rste));
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else
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present = pmd_present(__pmd(rste));
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/*
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* Convert encoding pmd bits pte bits
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* Convert encoding pmd / pud bits pte bits
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* dy..R...I...wr lIR.uswrdy.p
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* empty 00..0...1...00 -> 010.000000.0
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* prot-none, clean, old 00..1...1...00 -> 111.000000.1
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@ -70,16 +79,16 @@ static inline pte_t __pmd_to_pte(pmd_t pmd)
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* SW-bits: p present, y young, d dirty, r read, w write, s special,
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* u unused, l large
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*/
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if (pmd_present(pmd)) {
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pte_val(pte) = pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN_LARGE;
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if (present) {
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pte_val(pte) = rste & _SEGMENT_ENTRY_ORIGIN_LARGE;
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pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_READ) << 4;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) << 4;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) << 5;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT);
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) >> 10;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) >> 10;
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pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY) >> 13;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_READ) << 4;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_WRITE) << 4;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_INVALID) << 5;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_PROTECT);
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_DIRTY) >> 10;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_YOUNG) >> 10;
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pte_val(pte) |= (rste & _SEGMENT_ENTRY_SOFT_DIRTY) >> 13;
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} else
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pte_val(pte) = _PAGE_INVALID;
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return pte;
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@ -88,27 +97,33 @@ static inline pte_t __pmd_to_pte(pmd_t pmd)
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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pmd_t pmd = __pte_to_pmd(pte);
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unsigned long rste = __pte_to_rste(pte);
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pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
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*(pmd_t *) ptep = pmd;
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/* Set correct table type for 2G hugepages */
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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rste |= _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE;
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else
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rste |= _SEGMENT_ENTRY_LARGE;
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pte_val(*ptep) = rste;
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}
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pte_t huge_ptep_get(pte_t *ptep)
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{
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pmd_t pmd = *(pmd_t *) ptep;
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return __pmd_to_pte(pmd);
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return __rste_to_pte(pte_val(*ptep));
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte = huge_ptep_get(ptep);
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pmd_t *pmdp = (pmd_t *) ptep;
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pmd_t old;
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pud_t *pudp = (pud_t *) ptep;
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old = pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
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return __pmd_to_pte(old);
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY));
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else
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pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
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return pte;
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}
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pte_t *huge_pte_alloc(struct mm_struct *mm,
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@ -120,8 +135,12 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
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pgdp = pgd_offset(mm, addr);
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pudp = pud_alloc(mm, pgdp, addr);
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if (pudp)
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pmdp = pmd_alloc(mm, pudp, addr);
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if (pudp) {
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if (sz == PUD_SIZE)
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return (pte_t *) pudp;
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else if (sz == PMD_SIZE)
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pmdp = pmd_alloc(mm, pudp, addr);
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}
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return (pte_t *) pmdp;
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}
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@ -134,8 +153,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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pgdp = pgd_offset(mm, addr);
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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);
|
||||
|
||||
@ -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)
|
||||
|
||||
@ -1022,7 +1022,9 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
|
||||
((node = hstate_next_node_to_free(hs, mask)) || 1); \
|
||||
nr_nodes--)
|
||||
|
||||
#if defined(CONFIG_X86_64) && ((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA))
|
||||
#if (defined(CONFIG_X86_64) || defined(CONFIG_S390)) && \
|
||||
((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || \
|
||||
defined(CONFIG_CMA))
|
||||
static void destroy_compound_gigantic_page(struct page *page,
|
||||
unsigned int order)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user