forked from luck/tmp_suning_uos_patched
a551643895
The goal of this patchset is to support multiple hugetlb page sizes. This is achieved by introducing a new struct hstate structure, which encapsulates the important hugetlb state and constants (eg. huge page size, number of huge pages currently allocated, etc). The hstate structure is then passed around the code which requires these fields, they will do the right thing regardless of the exact hstate they are operating on. This patch adds the hstate structure, with a single global instance of it (default_hstate), and does the basic work of converting hugetlb to use the hstate. Future patches will add more hstate structures to allow for different hugetlbfs mounts to have different page sizes. [akpm@linux-foundation.org: coding-style fixes] Acked-by: Adam Litke <agl@us.ibm.com> Acked-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
185 lines
4.5 KiB
C
185 lines
4.5 KiB
C
/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2008
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#ifndef _ASM_S390_HUGETLB_H
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#define _ASM_S390_HUGETLB_H
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range free_pgd_range
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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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* If the arch doesn't supply something else, assume that hugepage
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* size aligned regions are ok without further preparation.
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*/
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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if (len & ~HPAGE_MASK)
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return -EINVAL;
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if (addr & ~HPAGE_MASK)
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return -EINVAL;
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return 0;
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}
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#define hugetlb_prefault_arch_hook(mm) do { } while (0)
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int arch_prepare_hugepage(struct page *page);
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void arch_release_hugepage(struct page *page);
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static inline pte_t pte_mkhuge(pte_t pte)
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{
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/*
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* PROT_NONE needs to be remapped from the pte type to the ste type.
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* The HW invalid bit is also different for pte and ste. The pte
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* invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
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* bit, so we don't have to clear it.
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*/
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if (pte_val(pte) & _PAGE_INVALID) {
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if (pte_val(pte) & _PAGE_SWT)
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pte_val(pte) |= _HPAGE_TYPE_NONE;
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pte_val(pte) |= _SEGMENT_ENTRY_INV;
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}
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/*
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* Clear SW pte bits SWT and SWX, there are no SW bits in a segment
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* table entry.
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*/
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pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
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/*
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* Also set the change-override bit because we don't need dirty bit
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* tracking for hugetlbfs pages.
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*/
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pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
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return pte;
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}
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static inline pte_t huge_pte_wrprotect(pte_t pte)
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{
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pte_val(pte) |= _PAGE_RO;
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return pte;
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}
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static inline int huge_pte_none(pte_t pte)
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{
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return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
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!(pte_val(pte) & _SEGMENT_ENTRY_RO);
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}
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static inline pte_t huge_ptep_get(pte_t *ptep)
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{
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pte_t pte = *ptep;
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unsigned long mask;
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if (!MACHINE_HAS_HPAGE) {
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ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
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if (ptep) {
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mask = pte_val(pte) &
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(_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
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pte = pte_mkhuge(*ptep);
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pte_val(pte) |= mask;
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}
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}
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return pte;
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}
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static inline 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_clear((pmd_t *) ptep);
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return pte;
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}
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static inline void __pmd_csp(pmd_t *pmdp)
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{
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register unsigned long reg2 asm("2") = pmd_val(*pmdp);
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register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
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_SEGMENT_ENTRY_INV;
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register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
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asm volatile(
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" csp %1,%3"
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: "=m" (*pmdp)
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: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
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pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
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}
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static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
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{
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unsigned long sto = (unsigned long) pmdp -
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pmd_index(address) * sizeof(pmd_t);
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if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
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asm volatile(
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" .insn rrf,0xb98e0000,%2,%3,0,0"
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: "=m" (*pmdp)
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: "m" (*pmdp), "a" (sto),
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"a" ((address & HPAGE_MASK))
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);
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}
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pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
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}
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static inline void huge_ptep_invalidate(struct mm_struct *mm,
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unsigned long address, pte_t *ptep)
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{
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pmd_t *pmdp = (pmd_t *) ptep;
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if (!MACHINE_HAS_IDTE) {
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__pmd_csp(pmdp);
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if (mm->context.noexec) {
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pmdp = get_shadow_table(pmdp);
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__pmd_csp(pmdp);
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}
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return;
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}
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__pmd_idte(address, pmdp);
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if (mm->context.noexec) {
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pmdp = get_shadow_table(pmdp);
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__pmd_idte(address, pmdp);
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}
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return;
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}
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#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
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({ \
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int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
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if (__changed) { \
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huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
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set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
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} \
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__changed; \
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})
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#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
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({ \
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pte_t __pte = huge_ptep_get(__ptep); \
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if (pte_write(__pte)) { \
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if (atomic_read(&(__mm)->mm_users) > 1 || \
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(__mm) != current->active_mm) \
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huge_ptep_invalidate(__mm, __addr, __ptep); \
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set_huge_pte_at(__mm, __addr, __ptep, \
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huge_pte_wrprotect(__pte)); \
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} \
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})
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static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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huge_ptep_invalidate(vma->vm_mm, address, ptep);
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}
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#endif /* _ASM_S390_HUGETLB_H */
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