Commit 106c992a authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Linus Torvalds

mm/hugetlb: add more arch-defined huge_pte functions

Commit abf09bed ("s390/mm: implement software dirty bits")
introduced another difference in the pte layout vs.  the pmd layout on
s390, thoroughly breaking the s390 support for hugetlbfs.  This requires
replacing some more pte_xxx functions in mm/hugetlbfs.c with a
huge_pte_xxx version.

This patch introduces those huge_pte_xxx functions and their generic
implementation in asm-generic/hugetlb.h, which will now be included on
all architectures supporting hugetlbfs apart from s390.  This change
will be a no-op for those architectures.

[akpm@linux-foundation.org: fix warning]
Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.cz>	[for !s390 parts]
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 146732ce
......@@ -2,6 +2,7 @@
#define _ASM_IA64_HUGETLB_H
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
......
......@@ -10,6 +10,7 @@
#define __ASM_HUGETLB_H
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
static inline int is_hugepage_only_range(struct mm_struct *mm,
......
......@@ -3,6 +3,7 @@
#ifdef CONFIG_HUGETLB_PAGE
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
extern struct kmem_cache *hugepte_cache;
......
......@@ -114,7 +114,7 @@ static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
({ \
pte_t __pte = huge_ptep_get(__ptep); \
if (pte_write(__pte)) { \
if (huge_pte_write(__pte)) { \
huge_ptep_invalidate(__mm, __addr, __ptep); \
set_huge_pte_at(__mm, __addr, __ptep, \
huge_pte_wrprotect(__pte)); \
......@@ -127,4 +127,58 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
huge_ptep_invalidate(vma->vm_mm, address, ptep);
}
static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
{
pte_t pte;
pmd_t pmd;
pmd = mk_pmd_phys(page_to_phys(page), pgprot);
pte_val(pte) = pmd_val(pmd);
return pte;
}
static inline int huge_pte_write(pte_t pte)
{
pmd_t pmd;
pmd_val(pmd) = pte_val(pte);
return pmd_write(pmd);
}
static inline int huge_pte_dirty(pte_t pte)
{
/* No dirty bit in the segment table entry. */
return 0;
}
static inline pte_t huge_pte_mkwrite(pte_t pte)
{
pmd_t pmd;
pmd_val(pmd) = pte_val(pte);
pte_val(pte) = pmd_val(pmd_mkwrite(pmd));
return pte;
}
static inline pte_t huge_pte_mkdirty(pte_t pte)
{
/* No dirty bit in the segment table entry. */
return pte;
}
static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
{
pmd_t pmd;
pmd_val(pmd) = pte_val(pte);
pte_val(pte) = pmd_val(pmd_modify(pmd, newprot));
return pte;
}
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pmd_clear((pmd_t *) ptep);
}
#endif /* _ASM_S390_HUGETLB_H */
......@@ -424,6 +424,13 @@ extern unsigned long MODULES_END;
#define __S110 PAGE_RW
#define __S111 PAGE_RW
/*
* Segment entry (large page) protection definitions.
*/
#define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
#define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
#define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
static inline int mm_exclusive(struct mm_struct *mm)
{
return likely(mm == current->active_mm &&
......@@ -914,26 +921,6 @@ static inline pte_t pte_mkspecial(pte_t pte)
#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte)
{
/*
* PROT_NONE needs to be remapped from the pte type to the ste type.
* The HW invalid bit is also different for pte and ste. The pte
* invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
* bit, so we don't have to clear it.
*/
if (pte_val(pte) & _PAGE_INVALID) {
if (pte_val(pte) & _PAGE_SWT)
pte_val(pte) |= _HPAGE_TYPE_NONE;
pte_val(pte) |= _SEGMENT_ENTRY_INV;
}
/*
* Clear SW pte bits, there are no SW bits in a segment table entry.
*/
pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX | _PAGE_SWC |
_PAGE_SWR | _PAGE_SWW);
/*
* Also set the change-override bit because we don't need dirty bit
* tracking for hugetlbfs pages.
*/
pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
return pte;
}
......@@ -1278,31 +1265,7 @@ static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
}
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
#define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
#define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
#define __HAVE_ARCH_PGTABLE_DEPOSIT
extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
#define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
static inline int pmd_trans_splitting(pmd_t pmd)
{
return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
}
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t entry)
{
if (!(pmd_val(entry) & _SEGMENT_ENTRY_INV) && MACHINE_HAS_EDAT1)
pmd_val(entry) |= _SEGMENT_ENTRY_CO;
*pmdp = entry;
}
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
/*
......@@ -1323,10 +1286,11 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
return pmd;
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
{
pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
return pmd;
pmd_t __pmd;
pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
return __pmd;
}
static inline pmd_t pmd_mkwrite(pmd_t pmd)
......@@ -1336,6 +1300,34 @@ static inline pmd_t pmd_mkwrite(pmd_t pmd)
pmd_val(pmd) &= ~_SEGMENT_ENTRY_RO;
return pmd;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define __HAVE_ARCH_PGTABLE_DEPOSIT
extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
#define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
static inline int pmd_trans_splitting(pmd_t pmd)
{
return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
}
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t entry)
{
if (!(pmd_val(entry) & _SEGMENT_ENTRY_INV) && MACHINE_HAS_EDAT1)
pmd_val(entry) |= _SEGMENT_ENTRY_CO;
*pmdp = entry;
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
return pmd;
}
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
......@@ -1432,13 +1424,6 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
}
}
static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
{
pmd_t __pmd;
pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
return __pmd;
}
#define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
......
......@@ -39,7 +39,7 @@ int arch_prepare_hugepage(struct page *page)
if (!ptep)
return -ENOMEM;
pte = mk_pte(page, PAGE_RW);
pte_val(pte) = addr;
for (i = 0; i < PTRS_PER_PTE; i++) {
set_pte_at(&init_mm, addr + i * PAGE_SIZE, ptep + i, pte);
pte_val(pte) += PAGE_SIZE;
......
......@@ -3,6 +3,7 @@
#include <asm/cacheflush.h>
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
static inline int is_hugepage_only_range(struct mm_struct *mm,
......
......@@ -2,6 +2,7 @@
#define _ASM_SPARC64_HUGETLB_H
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
......
......@@ -16,6 +16,7 @@
#define _ASM_TILE_HUGETLB_H
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
static inline int is_hugepage_only_range(struct mm_struct *mm,
......
......@@ -2,6 +2,7 @@
#define _ASM_X86_HUGETLB_H
#include <asm/page.h>
#include <asm-generic/hugetlb.h>
static inline int is_hugepage_only_range(struct mm_struct *mm,
......
#ifndef _ASM_GENERIC_HUGETLB_H
#define _ASM_GENERIC_HUGETLB_H
static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
{
return mk_pte(page, pgprot);
}
static inline int huge_pte_write(pte_t pte)
{
return pte_write(pte);
}
static inline int huge_pte_dirty(pte_t pte)
{
return pte_dirty(pte);
}
static inline pte_t huge_pte_mkwrite(pte_t pte)
{
return pte_mkwrite(pte);
}
static inline pte_t huge_pte_mkdirty(pte_t pte)
{
return pte_mkdirty(pte);
}
static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
{
return pte_modify(pte, newprot);
}
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_clear(mm, addr, ptep);
}
#endif /* _ASM_GENERIC_HUGETLB_H */
......@@ -2247,10 +2247,11 @@ static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page,
pte_t entry;
if (writable) {
entry =
pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page,
vma->vm_page_prot)));
} else {
entry = huge_pte_wrprotect(mk_pte(page, vma->vm_page_prot));
entry = huge_pte_wrprotect(mk_huge_pte(page,
vma->vm_page_prot));
}
entry = pte_mkyoung(entry);
entry = pte_mkhuge(entry);
......@@ -2264,7 +2265,7 @@ static void set_huge_ptep_writable(struct vm_area_struct *vma,
{
pte_t entry;
entry = pte_mkwrite(pte_mkdirty(huge_ptep_get(ptep)));
entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(ptep)));
if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1))
update_mmu_cache(vma, address, ptep);
}
......@@ -2379,7 +2380,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
* HWPoisoned hugepage is already unmapped and dropped reference
*/
if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
pte_clear(mm, address, ptep);
huge_pte_clear(mm, address, ptep);
continue;
}
......@@ -2403,7 +2404,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
pte = huge_ptep_get_and_clear(mm, address, ptep);
tlb_remove_tlb_entry(tlb, ptep, address);
if (pte_dirty(pte))
if (huge_pte_dirty(pte))
set_page_dirty(page);
page_remove_rmap(page);
......@@ -2856,7 +2857,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* page now as it is used to determine if a reservation has been
* consumed.
*/
if ((flags & FAULT_FLAG_WRITE) && !pte_write(entry)) {
if ((flags & FAULT_FLAG_WRITE) && !huge_pte_write(entry)) {
if (vma_needs_reservation(h, vma, address) < 0) {
ret = VM_FAULT_OOM;
goto out_mutex;
......@@ -2886,12 +2887,12 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (flags & FAULT_FLAG_WRITE) {
if (!pte_write(entry)) {
if (!huge_pte_write(entry)) {
ret = hugetlb_cow(mm, vma, address, ptep, entry,
pagecache_page);
goto out_page_table_lock;
}
entry = pte_mkdirty(entry);
entry = huge_pte_mkdirty(entry);
}
entry = pte_mkyoung(entry);
if (huge_ptep_set_access_flags(vma, address, ptep, entry,
......@@ -2972,7 +2973,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
* directly from any kind of swap entries.
*/
if (absent || is_swap_pte(huge_ptep_get(pte)) ||
((flags & FOLL_WRITE) && !pte_write(huge_ptep_get(pte)))) {
((flags & FOLL_WRITE) &&
!huge_pte_write(huge_ptep_get(pte)))) {
int ret;
spin_unlock(&mm->page_table_lock);
......@@ -3042,7 +3044,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
}
if (!huge_pte_none(huge_ptep_get(ptep))) {
pte = huge_ptep_get_and_clear(mm, address, ptep);
pte = pte_mkhuge(pte_modify(pte, newprot));
pte = pte_mkhuge(huge_pte_modify(pte, newprot));
pte = arch_make_huge_pte(pte, vma, NULL, 0);
set_huge_pte_at(mm, address, ptep, pte);
pages++;
......
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