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powerpc/mm/thp: Abstraction for THP functions

Browse source 
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-29 23:26:29 +10:00 committed by Michael Ellerman
parent 6a1ea36260
commit 3df33f12be
6 changed files with 227 additions and 180 deletions
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23
arch/powerpc/include/asm/book3s/64/hash-64k.h
View file

@ -119,11 +119,6 @@ static inline int hash__remap_4k_pfn(struct vm_area_struct *vma, unsigned long a
#define H_PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern unsigned long pmd_hugepage_update(struct mm_struct *mm,
unsigned long addr,
pmd_t *pmdp,
unsigned long clr,
unsigned long set);
static inline char *get_hpte_slot_array(pmd_t *pmdp)
{
/*
@ -193,6 +188,24 @@ static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
return (((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) & ~cpu_to_be64(_PAGE_HPTEFLAGS)) == 0);
}
static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
{
return __pmd(pmd_val(pmd) | (_PAGE_PTE | H_PAGE_THP_HUGE));
}
extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp,
unsigned long clr, unsigned long set);
extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable);
extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
extern void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp);
extern int hash__has_transparent_hugepage(void);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif /* __ASSEMBLY__ */

42
arch/powerpc/include/asm/book3s/64/pgtable-64k.h
View file

@ -54,41 +54,6 @@ static inline int hugepd_ok(hugepd_t hpd)
#endif /* CONFIG_HUGETLB_PAGE */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pmd_large(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_PTE);
}
static inline pmd_t pmd_mknotpresent(pmd_t pmd)
{
return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
}
/*
* For radix we should always find H_PAGE_HASHPTE zero. Hence
* the below will work for radix too
*/
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 | H_PAGE_HASHPTE)) == 0)
return 0;
old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
return ((old & _PAGE_ACCESSED) != 0);
}
#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_WRITE) == 0)
return;
pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
}
static inline int pmd_trans_huge(pmd_t pmd)
{
if (radix_enabled())
@ -103,6 +68,12 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
return radix__pmd_same(pmd_a, pmd_b);
return hash__pmd_same(pmd_a, pmd_b);
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
return hash__pmd_mkhuge(pmd);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
@ -111,7 +82,6 @@ static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
if (radix_enabled())
BUG();
return hash__remap_4k_pfn(vma, addr, pfn, prot);
}
#endif /* __ASSEMBLY__ */
#endif /*_ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H */

85
arch/powerpc/include/asm/book3s/64/pgtable.h
View file

@ -769,7 +769,6 @@ static inline int __meminit vmemmap_create_mapping(unsigned long start,
static inline void vmemmap_remove_mapping(unsigned long start,
unsigned long page_size)
{
if (radix_enabled())
return radix__vmemmap_remove_mapping(start, page_size);
return hash__vmemmap_remove_mapping(start, page_size);
@ -825,11 +824,52 @@ 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);
extern int has_transparent_hugepage(void);
static inline pmd_t pmd_mkhuge(pmd_t pmd)
extern int hash__has_transparent_hugepage(void);
static inline int has_transparent_hugepage(void)
{
return __pmd(pmd_val(pmd) | (_PAGE_PTE | H_PAGE_THP_HUGE));
return hash__has_transparent_hugepage();
}
static inline unsigned long
pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
unsigned long clr, unsigned long set)
{
return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
}
static inline int pmd_large(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_PTE);
}
static inline pmd_t pmd_mknotpresent(pmd_t pmd)
{
return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
}
/*
* For radix we should always find H_PAGE_HASHPTE zero. Hence
* the below will work for radix too
*/
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 | H_PAGE_HASHPTE)) == 0)
return 0;
old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
return ((old & _PAGE_ACCESSED) != 0);
}
#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_WRITE) == 0)
return;
pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
}
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
@ -842,26 +882,43 @@ extern int pmdp_test_and_clear_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);
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp)
{
return hash__pmdp_huge_get_and_clear(mm, addr, pmdp);
}
extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
return hash__pmdp_collapse_flush(vma, address, 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);
static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
pmd_t *pmdp, pgtable_t pgtable)
{
return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
}
#define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm,
pmd_t *pmdp)
{
return hash__pgtable_trans_huge_withdraw(mm, pmdp);
}
#define __HAVE_ARCH_PMDP_INVALIDATE
extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp);
#define __HAVE_ARCH_PMDP_HUGE_SPLIT_PREPARE
extern void pmdp_huge_split_prepare(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
return hash__pmdp_huge_split_prepare(vma, address, pmdp);
}
#define pmd_move_must_withdraw pmd_move_must_withdraw
struct spinlock;

2
arch/powerpc/mm/Makefile
View file

@ -14,7 +14,7 @@ obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \
obj-$(CONFIG_PPC_BOOK3E) += tlb_low_$(CONFIG_WORD_SIZE)e.o
hash64-$(CONFIG_PPC_NATIVE) := hash_native_64.o
obj-$(CONFIG_PPC_BOOK3E_64) += pgtable-book3e.o
obj-$(CONFIG_PPC_STD_MMU_64) += pgtable-hash64.o hash_utils_64.o slb_low.o slb.o $(hash64-y) mmu_context_book3s64.o
obj-$(CONFIG_PPC_STD_MMU_64) += pgtable-hash64.o hash_utils_64.o slb_low.o slb.o $(hash64-y) mmu_context_book3s64.o pgtable-book3s64.o
obj-$(CONFIG_PPC_RADIX_MMU) += pgtable-radix.o tlb-radix.o
obj-$(CONFIG_PPC_STD_MMU_32) += ppc_mmu_32.o hash_low_32.o mmu_context_hash32.o
obj-$(CONFIG_PPC_STD_MMU) += tlb_hash$(CONFIG_WORD_SIZE).o

118
arch/powerpc/mm/pgtable-book3s64.c Normal file
View file

@ -0,0 +1,118 @@
/*
* Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include "mmu_decl.h"
#include <trace/events/thp.h>
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* This is called when relaxing access to a hugepage. It's also called in the page
* fault path when we don't hit any of the major fault cases, ie, a minor
* update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
* handled those two for us, we additionally deal with missing execute
* permission here on some processors
*/
int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp, pmd_t entry, int dirty)
{
int changed;
#ifdef CONFIG_DEBUG_VM
WARN_ON(!pmd_trans_huge(*pmdp));
assert_spin_locked(&vma->vm_mm->page_table_lock);
#endif
changed = !pmd_same(*(pmdp), entry);
if (changed) {
__ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry));
/*
* Since we are not supporting SW TLB systems, we don't
* have any thing similar to flush_tlb_page_nohash()
*/
}
return changed;
}
int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
}
/*
* set a new huge pmd. We should not be called for updating
* an existing pmd entry. That should go via pmd_hugepage_update.
*/
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
#ifdef CONFIG_DEBUG_VM
WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
assert_spin_locked(&mm->page_table_lock);
WARN_ON(!pmd_trans_huge(pmd));
#endif
trace_hugepage_set_pmd(addr, pmd_val(pmd));
return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
}
/*
* We use this to invalidate a pmdp entry before switching from a
* hugepte to regular pmd entry.
*/
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
/*
* This ensures that generic code that rely on IRQ disabling
* to prevent a parallel THP split work as expected.
*/
kick_all_cpus_sync();
}
static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
{
return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
}
pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
{
unsigned long pmdv;
pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
return pmd_set_protbits(__pmd(pmdv), pgprot);
}
pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
{
return pfn_pmd(page_to_pfn(page), pgprot);
}
pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
unsigned long pmdv;
pmdv = pmd_val(pmd);
pmdv &= _HPAGE_CHG_MASK;
return pmd_set_protbits(__pmd(pmdv), newprot);
}
/*
* This is called at the end of handling a user page fault, when the
* fault has been handled by updating a HUGE PMD entry in the linux page tables.
* We use it to preload an HPTE into the hash table corresponding to
* the updated linux HUGE PMD entry.
*/
void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd)
{
return;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

137
arch/powerpc/mm/pgtable-hash64.c
View file

@ -99,35 +99,9 @@ int hash__map_kernel_page(unsigned long ea, unsigned long pa, unsigned long flag
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* This is called when relaxing access to a hugepage. It's also called in the page
* fault path when we don't hit any of the major fault cases, ie, a minor
* update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
* handled those two for us, we additionally deal with missing execute
* permission here on some processors
*/
int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp, pmd_t entry, int dirty)
{
int changed;
#ifdef CONFIG_DEBUG_VM
WARN_ON(!pmd_trans_huge(*pmdp));
assert_spin_locked(&vma->vm_mm->page_table_lock);
#endif
changed = !pmd_same(*(pmdp), entry);
if (changed) {
__ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry));
/*
* Since we are not supporting SW TLB systems, we don't
* have any thing similar to flush_tlb_page_nohash()
*/
}
return changed;
}
unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, unsigned long clr,
unsigned long set)
unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, unsigned long clr,
unsigned long set)
{
__be64 old_be, tmp;
unsigned long old;
@ -158,8 +132,8 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
return old;
}
pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
pmd_t pmd;
@ -197,25 +171,12 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
return pmd;
}
/*
* We currently remove entries from the hashtable regardless of whether
* the entry was young or dirty.
*
* We should be more intelligent about this but for the moment we override
* these functions and force a tlb flush unconditionally
*/
int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
}
/*
* We want to put the pgtable in pmd and use pgtable for tracking
* the base page size hptes
*/
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable)
void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable)
{
pgtable_t *pgtable_slot;
assert_spin_locked(&mm->page_table_lock);
@ -233,7 +194,7 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
smp_wmb();
}
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
{
pgtable_t pgtable;
pgtable_t *pgtable_slot;
@ -253,8 +214,8 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
return pgtable;
}
void pmdp_huge_split_prepare(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
VM_BUG_ON(REGION_ID(address) != USER_REGION_ID);
@ -274,39 +235,6 @@ void pmdp_huge_split_prepare(struct vm_area_struct *vma,
pmd_hugepage_update(vma->vm_mm, address, pmdp, 0, _PAGE_PRIVILEGED);
}
/*
* set a new huge pmd. We should not be called for updating
* an existing pmd entry. That should go via pmd_hugepage_update.
*/
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
#ifdef CONFIG_DEBUG_VM
WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
assert_spin_locked(&mm->page_table_lock);
WARN_ON(!pmd_trans_huge(pmd));
#endif
trace_hugepage_set_pmd(addr, pmd_val(pmd));
return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
}
/*
* We use this to invalidate a pmdp entry before switching from a
* hugepte to regular pmd entry.
*/
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
/*
* This ensures that generic code that rely on IRQ disabling
* to prevent a parallel THP split work as expected.
*/
kick_all_cpus_sync();
}
/*
* A linux hugepage PMD was changed and the corresponding hash table entries
* neesd to be flushed.
@ -346,47 +274,8 @@ void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
return flush_hash_hugepage(vsid, addr, pmdp, psize, ssize, flags);
}
static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
{
return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
}
pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
{
unsigned long pmdv;
pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
return pmd_set_protbits(__pmd(pmdv), pgprot);
}
pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
{
return pfn_pmd(page_to_pfn(page), pgprot);
}
pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
unsigned long pmdv;
pmdv = pmd_val(pmd);
pmdv &= _HPAGE_CHG_MASK;
return pmd_set_protbits(__pmd(pmdv), newprot);
}
/*
* This is called at the end of handling a user page fault, when the
* fault has been handled by updating a HUGE PMD entry in the linux page tables.
* We use it to preload an HPTE into the hash table corresponding to
* the updated linux HUGE PMD entry.
*/
void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd)
{
return;
}
pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp)
pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp)
{
pmd_t old_pmd;
pgtable_t pgtable;
@ -421,7 +310,7 @@ pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
return old_pmd;
}
int has_transparent_hugepage(void)
int hash__has_transparent_hugepage(void)
{
if (!mmu_has_feature(MMU_FTR_16M_PAGE))