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sparc64: Support huge PUD case in get_user_pages 

get_user_pages() is used to do direct IO. It already
handles the case where the address range is backed
by PMD huge pages. This patch now adds the case where
the range could be backed by PUD huge pages.

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nitin Gupta 2017-08-11 16:46:49 -07:00 committed by David S. Miller
parent 91752a9c7b
commit 44382b0195
2 changed files with 57 additions and 3 deletions
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15
arch/sparc/include/asm/pgtable_64.h
View File

@ -687,6 +687,8 @@ static inline unsigned long pmd_write(pmd_t pmd)
return pte_write(pte);
}
#define pud_write(pud) pte_write(__pte(pud_val(pud)))
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline unsigned long pmd_dirty(pmd_t pmd)
{
@ -823,9 +825,18 @@ static inline unsigned long __pmd_page(pmd_t pmd)
return ((unsigned long) __va(pfn << PAGE_SHIFT));
}
static inline unsigned long pud_page_vaddr(pud_t pud)
{
pte_t pte = __pte(pud_val(pud));
unsigned long pfn;
pfn = pte_pfn(pte);
return ((unsigned long) __va(pfn << PAGE_SHIFT));
}
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud) \
((unsigned long) __va(pud_val(pud)))
#define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
#define pud_present(pud) (pud_val(pud) != 0U)

45
arch/sparc/mm/gup.c
View File

@ -103,6 +103,45 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
return 1;
}
static int gup_huge_pud(pud_t *pudp, pud_t pud, unsigned long addr,
unsigned long end, int write, struct page **pages,
int *nr)
{
struct page *head, *page;
int refs;
if (!(pud_val(pud) & _PAGE_VALID))
return 0;
if (write && !pud_write(pud))
return 0;
refs = 0;
page = pud_page(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
head = compound_head(page);
do {
VM_BUG_ON(compound_head(page) != head);
pages[*nr] = page;
(*nr)++;
page++;
refs++;
} while (addr += PAGE_SIZE, addr != end);
if (!page_cache_add_speculative(head, refs)) {
*nr -= refs;
return 0;
}
if (unlikely(pud_val(pud) != pud_val(*pudp))) {
*nr -= refs;
while (refs--)
put_page(head);
return 0;
}
return 1;
}
static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
int write, struct page **pages, int *nr)
{
@ -141,7 +180,11 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
next = pud_addr_end(addr, end);
if (pud_none(pud))
return 0;
if (!gup_pmd_range(pud, addr, next, write, pages, nr))
if (unlikely(pud_large(pud))) {
if (!gup_huge_pud(pudp, pud, addr, next,
write, pages, nr))
return 0;
} else if (!gup_pmd_range(pud, addr, next, write, pages, nr))
return 0;
} while (pudp++, addr = next, addr != end);