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powerpc/thp: Handle combo pages in invalidate 

If we changed base page size of the segment, either via sub_page_protect
or via remap_4k_pfn, we do a demote_segment which doesn't flush the hash
table entries. We do a lazy hash page table flush for all mapped pages
in the demoted segment. This happens when we handle hash page fault for
these pages.

We use _PAGE_COMBO bit along with _PAGE_HASHPTE to indicate whether a
pte is backed by 4K hash pte. If we find _PAGE_COMBO not set on the pte,
that implies that we could possibly have older 64K hash pte entries in
the hash page table and we need to invalidate those entries.

Use _PAGE_COMBO to determine the page size with which we should
invalidate the hash table entries on unmap.

CC: <stable@vger.kernel.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
wifi-calibration
Aneesh Kumar K.V 2014-08-13 12:32:00 +05:30 committed by Benjamin Herrenschmidt
parent 629149fae4
commit fc04795575
3 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/pgtable-ppc64.h
View File

@ -413,7 +413,7 @@ static inline char *get_hpte_slot_array(pmd_t *pmdp)
}
extern void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp);
pmd_t *pmdp, unsigned long old_pmd);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot);
extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot);

14
arch/powerpc/mm/pgtable_64.c
View File

@ -538,7 +538,7 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
*pmdp = __pmd((old & ~clr) | set);
#endif
if (old & _PAGE_HASHPTE)
hpte_do_hugepage_flush(mm, addr, pmdp);
hpte_do_hugepage_flush(mm, addr, pmdp, old);
return old;
}
@ -645,7 +645,7 @@ void pmdp_splitting_flush(struct vm_area_struct *vma,
if (!(old & _PAGE_SPLITTING)) {
/* We need to flush the hpte */
if (old & _PAGE_HASHPTE)
hpte_do_hugepage_flush(vma->vm_mm, address, pmdp);
hpte_do_hugepage_flush(vma->vm_mm, address, pmdp, old);
}
/*
* This ensures that generic code that rely on IRQ disabling
@ -723,7 +723,7 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
* neesd to be flushed.
*/
void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp)
pmd_t *pmdp, unsigned long old_pmd)
{
int ssize, i;
unsigned long s_addr;
@ -746,7 +746,15 @@ void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
return;
/* get the base page size,vsid and segment size */
#ifdef CONFIG_DEBUG_VM
psize = get_slice_psize(mm, s_addr);
BUG_ON(psize == MMU_PAGE_16M);
#endif
if (old_pmd & _PAGE_COMBO)
psize = MMU_PAGE_4K;
else
psize = MMU_PAGE_64K;
if (!is_kernel_addr(s_addr)) {
ssize = user_segment_size(s_addr);
vsid = get_vsid(mm->context.id, s_addr, ssize);

2
arch/powerpc/mm/tlb_hash64.c
View File

@ -216,7 +216,7 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
if (!(pte & _PAGE_HASHPTE))
continue;
if (unlikely(hugepage_shift && pmd_trans_huge(*(pmd_t *)pte)))
hpte_do_hugepage_flush(mm, start, (pmd_t *)pte);
hpte_do_hugepage_flush(mm, start, (pmd_t *)ptep, pte);
else
hpte_need_flush(mm, start, ptep, pte, 0);
}