[PATCH] powerpc/mm: Add _PAGE_DEVMAP pte bit for ppc64.
From: Aneesh Kumar K.V <hidden>
Date: 2016-11-07 08:38:37
Signed-off-by: Aneesh Kumar K.V <redacted> --- NOTE: We need other patches to enable pmem on ppc64. I am waiting for dax pmd fault handling cleanup to hit upstream before I send the changes. Meanwhile reserve the pte bit. arch/powerpc/include/asm/book3s/64/pgtable.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 9eed9d66d24f..af9e1a150ae7 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h@@ -32,6 +32,8 @@ #define _PAGE_SOFT_DIRTY 0x00000 #endif #define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */ +#define _PAGE_DEVMAP _RPAGE_SW1 +#define __HAVE_ARCH_PTE_DEVMAP #define _PAGE_PTE (1ul << 62) /* distinguishes PTEs from pointers */
@@ -485,6 +487,16 @@ static inline pte_t pte_mkhuge(pte_t pte) return pte; } +static inline pte_t pte_mkdevmap(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SPECIAL|_PAGE_DEVMAP); +} + +static inline int pte_devmap(pte_t pte) +{ + return !!(pte_raw(pte) & cpu_to_be64(_PAGE_DEVMAP)); +} + static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { /* FIXME!! check whether this need to be a conditional */
@@ -1030,6 +1042,18 @@ static inline bool arch_needs_pgtable_deposit(void) return true; } +static inline pmd_t pmd_mkdevmap(pmd_t pmd) +{ + /* + * No special ptes at pmd level. + */ + return __pmd(pmd_val(pmd) | _PAGE_DEVMAP); +} + +static inline int pmd_devmap(pmd_t pmd) +{ + return pte_devmap(pmd_pte(pmd)); +} #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */
--
2.10.2