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powerpc/mm/hugetlb: Add flush_hugetlb_tlb_range

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Some archs like ppc64 need to do special things when flushing tlb for
hugepage. Add a new helper to flush hugetlb tlb range. This helps us to
avoid flushing the entire tlb mapping for the pid.

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 2016-07-13 15:06:43 +05:30 committed by Michael Ellerman
parent fbfa26d854
commit 5491ae7b6f
4 changed files with 31 additions and 1 deletions
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2
arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
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@ -10,6 +10,8 @@ static inline int mmu_get_ap(int psize)
return mmu_psize_defs[psize].ap;
}
extern void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long end, int psize);
extern void radix__flush_pmd_tlb_range(struct vm_area_struct *vma,

10
arch/powerpc/include/asm/book3s/64/tlbflush.h
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@ -16,6 +16,16 @@ static inline void flush_pmd_tlb_range(struct vm_area_struct *vma,
return hash__flush_tlb_range(vma, start, end);
}
#define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
unsigned long start,
unsigned long end)
{
if (radix_enabled())
return radix__flush_hugetlb_tlb_range(vma, start, end);
return hash__flush_tlb_range(vma, start, end);
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{

10
arch/powerpc/mm/hugetlbpage-radix.c
View File

@ -25,6 +25,16 @@ void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long v
radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
}
void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
int psize;
struct hstate *hstate = hstate_file(vma->vm_file);
psize = hstate_get_psize(hstate);
radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
}
/*
* A vairant of hugetlb_get_unmapped_area doing topdown search
* FIXME!! should we do as x86 does or non hugetlb area does ?

10
mm/hugetlb.c
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@ -3938,6 +3938,14 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
return i ? i : -EFAULT;
}
#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
/*
* ARCHes with special requirements for evicting HUGETLB backing TLB entries can
* implement this.
*/
#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
#endif
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot)
{
@ -3998,7 +4006,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* once we release i_mmap_rwsem, another task can do the final put_page
* and that page table be reused and filled with junk.
*/
flush_tlb_range(vma, start, end);
flush_hugetlb_tlb_range(vma, start, end);
mmu_notifier_invalidate_range(mm, start, end);
i_mmap_unlock_write(vma->vm_file->f_mapping);
mmu_notifier_invalidate_range_end(mm, start, end);