@@ -1788,7 +1788,7 @@ config SYS_SUPPORTS_HUGETLBFS
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
def_bool y
- depends on ARM_LPAE
+ depends on SYS_SUPPORTS_HUGETLBFS
config ARCH_WANT_GENERAL_HUGETLB
def_bool y
@@ -211,6 +211,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
*/
#define PMD_DSECT_DIRTY (_AT(pmdval_t, 1) << 5)
#define PMD_DSECT_AF (_AT(pmdval_t, 1) << 6)
+#define PMD_DSECT_SPLITTING (_AT(pmdval_t, 1) << 7)
#define PMD_BIT_FUNC(fn,op) \
static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
@@ -234,12 +235,25 @@ extern pgprot_t get_huge_pgprot(pgprot_t newprot);
#define pfn_pmd(pfn,prot) __pmd(__pfn_to_phys(pfn) | pgprot_val(prot));
#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),get_huge_pgprot(prot));
+#define pmd_mkhuge(pmd) (pmd)
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_DSECT_SPLITTING)
+#define pmd_trans_huge(pmd) (pmd_large(pmd))
+#else
+static inline int pmd_trans_huge(pmd_t pmd);
+#endif
+
+#define pmd_mknotpresent(pmd) (__pmd(0))
PMD_BIT_FUNC(mkdirty, |= PMD_DSECT_DIRTY);
PMD_BIT_FUNC(mkwrite, |= PMD_SECT_AP_WRITE);
PMD_BIT_FUNC(wrprotect, &= ~PMD_SECT_AP_WRITE);
PMD_BIT_FUNC(mknexec, |= PMD_SECT_XN);
PMD_BIT_FUNC(rmprotnone, |= PMD_TYPE_SECT);
+PMD_BIT_FUNC(mkold, &= ~PMD_DSECT_AF);
+PMD_BIT_FUNC(mksplitting, |= PMD_DSECT_SPLITTING);
+PMD_BIT_FUNC(mkyoung, |= PMD_DSECT_AF);
#define pmd_young(pmd) (pmd_val(pmd) & PMD_DSECT_AF)
#define pmd_write(pmd) (pmd_val(pmd) & PMD_SECT_AP_WRITE)
@@ -281,6 +295,26 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
return pmd;
}
+static inline int has_transparent_hugepage(void)
+{
+ return 1;
+}
+
+
+static inline struct page *pmd_page(pmd_t pmd)
+{
+ /*
+ * for a section, we need to mask off more of the pmd
+ * before looking up the page as it is a section descriptor.
+ *
+ * pmd_page only gets sections from the thp code.
+ */
+ if (pmd_trans_huge(pmd))
+ return (phys_to_page(pmd_val(pmd) & HPAGE_MASK));
+
+ return phys_to_page(pmd_val(pmd) & PHYS_MASK);
+}
+
#endif /* __ASSEMBLY__ */
#endif /* _ASM_PGTABLE_2LEVEL_H */
@@ -215,6 +215,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
#define pmd_hugewillfault(pmd) (!pmd_young(pmd) || !pmd_write(pmd))
#define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd))
+#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
@@ -189,8 +189,6 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
}
-#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
-
#ifndef CONFIG_HIGHPTE
#define __pte_map(pmd) pmd_page_vaddr(*(pmd))
#define __pte_unmap(pte) do { } while (0)
Much of the required code for THP has been implemented in the earlier non-LPAE HugeTLB patch. One more domain bit is used (to store whether or not the THP is splitting). Some THP helper functions are defined; and we have to re-define pmd_page such that it distinguishes between page tables and sections. Signed-off-by: Steve Capper <steve.capper@linaro.org> --- arch/arm/Kconfig | 2 +- arch/arm/include/asm/pgtable-2level.h | 34 ++++++++++++++++++++++++++++++++++ arch/arm/include/asm/pgtable-3level.h | 1 + arch/arm/include/asm/pgtable.h | 2 -- 4 files changed, 36 insertions(+), 3 deletions(-)