[PATCH v14 06/22] powerpc: mm: Add p?d_leaf() definitions

Steven Price
2019-10-28T13:59:40Z

walk_page_range() is going to be allowed to walk page tables other than
those of user space. For this it needs to know when it has reached a
'leaf' entry in the page tables. This information is provided by the
p?d_leaf() functions/macros.

For powerpc pmd_large() already exists and does what we want, so hoist
it out of the CONFIG_TRANSPARENT_HUGEPAGE condition and implement the
other levels. Macros are used to provide the generic p?d_leaf() names.

CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
CC: Michael Ellerman <mpe@ellerman.id.au>
CC: linuxppc-dev@lists.ozlabs.org
CC: kvm-ppc@vger.kernel.org
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 30 ++++++++++++++------
1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index b01624e5c467..3dd7b6f5edd0 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -923,6 +923,12 @@ static inline int pud_present(pud_t pud)
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT));
}

+#define pud_leaf pud_large
+static inline int pud_large(pud_t pud)
+{
+ return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
+}
+
extern struct page *pud_page(pud_t pud);
extern struct page *pmd_page(pmd_t pmd);
static inline pte_t pud_pte(pud_t pud)
@@ -966,6 +972,12 @@ static inline int pgd_present(pgd_t pgd)
return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT));
}

+#define pgd_leaf pgd_large
+static inline int pgd_large(pgd_t pgd)
+{
+ return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE));
+}
+
static inline pte_t pgd_pte(pgd_t pgd)
{
return __pte_raw(pgd_raw(pgd));
@@ -1133,6 +1145,15 @@ static inline bool pmd_access_permitted(pmd_t pmd, bool write)
return pte_access_permitted(pmd_pte(pmd), write);
}

+#define pmd_leaf pmd_large
+/*
+ * returns true for pmd migration entries, THP, devmap, hugetlb
+ */
+static inline int pmd_large(pmd_t pmd)
+{
+ return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
+}
+
#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);
@@ -1159,15 +1180,6 @@ pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
}

-/*
- * returns true for pmd migration entries, THP, devmap, hugetlb
- * But compile time dependent on THP config
- */
-static inline int pmd_large(pmd_t pmd)
-{
- return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
-}
-
static inline pmd_t pmd_mknotpresent(pmd_t pmd)
{
return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
--
2.20.1