powerpc/mm: Move THP headers around

We support THP only with book3s_64 and 64K page size. Move
THP details to hash64-64k.h to clarify the same.

Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 5 insertions, 248 deletions

diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index c24e03f22655..d635a924d652 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -154,6 +154,11 @@ static inline void pmd_clear(pmd_t *pmdp)
         *pmdp = __pmd(0);
 }
 
+static inline pte_t pmd_pte(pmd_t pmd)
+{
+        return __pte(pmd_val(pmd));
+}
+
 #define pmd_none(pmd)           (!pmd_val(pmd))
 #define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
                                  || (pmd_val(pmd) & PMD_BAD_BITS))
@@ -389,252 +394,4 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 void pgtable_cache_init(void);
 #endif /* __ASSEMBLY__ */
 
-/*
- * THP pages can't be special. So use the _PAGE_SPECIAL
- */
-#define _PAGE_SPLITTING _PAGE_SPECIAL
-
-/*
- * We need to differentiate between explicit huge page and THP huge
- * page, since THP huge page also need to track real subpage details
- */
-#define _PAGE_THP_HUGE  _PAGE_4K_PFN
-
-/*
- * set of bits not changed in pmd_modify.
- */
-#define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS |               \
-                         _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPLITTING | \
-                         _PAGE_THP_HUGE)
-
-#ifndef __ASSEMBLY__
-/*
- * The linux hugepage PMD now include the pmd entries followed by the address
- * to the stashed pgtable_t. The stashed pgtable_t contains the hpte bits.
- * [ 1 bit secondary | 3 bit hidx | 1 bit valid | 000]. We use one byte per
- * each HPTE entry. With 16MB hugepage and 64K HPTE we need 256 entries and
- * with 4K HPTE we need 4096 entries. Both will fit in a 4K pgtable_t.
- *
- * The last three bits are intentionally left to zero. This memory location
- * are also used as normal page PTE pointers. So if we have any pointers
- * left around while we collapse a hugepage, we need to make sure
- * _PAGE_PRESENT bit of that is zero when we look at them
- */
-static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
-{
-        return (hpte_slot_array[index] >> 3) & 0x1;
-}
-
-static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
-                                           int index)
-{
-        return hpte_slot_array[index] >> 4;
-}
-
-static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
-                                        unsigned int index, unsigned int hidx)
-{
-        hpte_slot_array[index] = hidx << 4 | 0x1 << 3;
-}
-
-struct page *realmode_pfn_to_page(unsigned long pfn);
-
-static inline char *get_hpte_slot_array(pmd_t *pmdp)
-{
-        /*
-         * The hpte hindex is stored in the pgtable whose address is in the
-         * second half of the PMD
-         *
-         * Order this load with the test for pmd_trans_huge in the caller
-         */
-        smp_rmb();
-        return *(char **)(pmdp + PTRS_PER_PMD);
-
-
-}
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
-                                   pmd_t *pmdp, unsigned long old_pmd);
-extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot);
-extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot);
-extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot);
-extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
-                       pmd_t *pmdp, pmd_t pmd);
-extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
-                                 pmd_t *pmd);
-/*
- *
- * For core kernel code by design pmd_trans_huge is never run on any hugetlbfs
- * page. The hugetlbfs page table walking and mangling paths are totally
- * separated form the core VM paths and they're differentiated by
- *  VM_HUGETLB being set on vm_flags well before any pmd_trans_huge could run.
- *
- * pmd_trans_huge() is defined as false at build time if
- * CONFIG_TRANSPARENT_HUGEPAGE=n to optimize away code blocks at build
- * time in such case.
- *
- * For ppc64 we need to differntiate from explicit hugepages from THP, because
- * for THP we also track the subpage details at the pmd level. We don't do
- * that for explicit huge pages.
- *
- */
-static inline int pmd_trans_huge(pmd_t pmd)
-{
-        /*
-         * leaf pte for huge page, bottom two bits != 00
-         */
-        return (pmd_val(pmd) & 0x3) && (pmd_val(pmd) & _PAGE_THP_HUGE);
-}
-
-static inline int pmd_trans_splitting(pmd_t pmd)
-{
-        if (pmd_trans_huge(pmd))
-                return pmd_val(pmd) & _PAGE_SPLITTING;
-        return 0;
-}
-
-extern int has_transparent_hugepage(void);
-#else
-static inline void hpte_do_hugepage_flush(struct mm_struct *mm,
-                                          unsigned long addr, pmd_t *pmdp,
-                                          unsigned long old_pmd)
-{
-
-        WARN(1, "%s called with THP disabled\n", __func__);
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
-static inline int pmd_large(pmd_t pmd)
-{
-        /*
-         * leaf pte for huge page, bottom two bits != 00
-         */
-        return ((pmd_val(pmd) & 0x3) != 0x0);
-}
-
-static inline pte_t pmd_pte(pmd_t pmd)
-{
-        return __pte(pmd_val(pmd));
-}
-
-static inline pmd_t pte_pmd(pte_t pte)
-{
-        return __pmd(pte_val(pte));
-}
-
-static inline pte_t *pmdp_ptep(pmd_t *pmd)
-{
-        return (pte_t *)pmd;
-}
-
-#define pmd_pfn(pmd)            pte_pfn(pmd_pte(pmd))
-#define pmd_dirty(pmd)          pte_dirty(pmd_pte(pmd))
-#define pmd_young(pmd)          pte_young(pmd_pte(pmd))
-#define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
-#define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
-#define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
-#define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
-#define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
-
-#define __HAVE_ARCH_PMD_WRITE
-#define pmd_write(pmd)          pte_write(pmd_pte(pmd))
-
-static inline pmd_t pmd_mkhuge(pmd_t pmd)
-{
-        /* Do nothing, mk_pmd() does this part.  */
-        return pmd;
-}
-
-static inline pmd_t pmd_mknotpresent(pmd_t pmd)
-{
-        return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
-}
-
-static inline pmd_t pmd_mksplitting(pmd_t pmd)
-{
-        return __pmd(pmd_val(pmd) | _PAGE_SPLITTING);
-}
-
-#define __HAVE_ARCH_PMD_SAME
-static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
-{
-        return (((pmd_val(pmd_a) ^ pmd_val(pmd_b)) & ~_PAGE_HPTEFLAGS) == 0);
-}
-
-#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
-extern int pmdp_set_access_flags(struct vm_area_struct *vma,
-                                 unsigned long address, pmd_t *pmdp,
-                                 pmd_t entry, int dirty);
-
-extern unsigned long pmd_hugepage_update(struct mm_struct *mm,
-                                         unsigned long addr,
-                                         pmd_t *pmdp,
-                                         unsigned long clr,
-                                         unsigned long set);
-
-static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
-                                              unsigned long addr, pmd_t *pmdp)
-{
-        unsigned long old;
-
-        if ((pmd_val(*pmdp) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
-                return 0;
-        old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
-        return ((old & _PAGE_ACCESSED) != 0);
-}
-
-#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-                                     unsigned long address, pmd_t *pmdp);
-#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
-extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
-                                  unsigned long address, pmd_t *pmdp);
-
-#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
-extern pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
-                                     unsigned long addr, pmd_t *pmdp);
-
-#define __HAVE_ARCH_PMDP_SET_WRPROTECT
-static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
-                                      pmd_t *pmdp)
-{
-
-        if ((pmd_val(*pmdp) & _PAGE_RW) == 0)
-                return;
-
-        pmd_hugepage_update(mm, addr, pmdp, _PAGE_RW, 0);
-}
-
-#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
-extern void pmdp_splitting_flush(struct vm_area_struct *vma,
-                                 unsigned long address, pmd_t *pmdp);
-
-extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
-                                 unsigned long address, pmd_t *pmdp);
-#define pmdp_collapse_flush pmdp_collapse_flush
-
-#define __HAVE_ARCH_PGTABLE_DEPOSIT
-extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
-                                       pgtable_t pgtable);
-#define __HAVE_ARCH_PGTABLE_WITHDRAW
-extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
-
-#define __HAVE_ARCH_PMDP_INVALIDATE
-extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
-                            pmd_t *pmdp);
-
-#define pmd_move_must_withdraw pmd_move_must_withdraw
-struct spinlock;
-static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
-                                         struct spinlock *old_pmd_ptl)
-{
-        /*
-         * Archs like ppc64 use pgtable to store per pmd
-         * specific information. So when we switch the pmd,
-         * we should also withdraw and deposit the pgtable
-         */
-        return true;
-}
-#endif /* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */