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authorSteve Capper <steve.capper@linaro.org>2014-02-18 12:06:39 +0000
committerSteve Capper <steve.capper@linaro.org>2014-04-16 12:21:48 +0100
commit439630445959e6d907c24e165e169d5154a79c5e (patch)
tree3913fda65bba7f3a908d8a13d777acbfd39dee40
parent456f28cc9213507f02009f7e2c8543a7b1c5924b (diff)
downloadlinux-hugepages-3.15-short-respin.tar.gz
arm: mm: Add Transparent HugePage support for non-LPAEhugepages-3.15-short-respin
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>
-rw-r--r--arch/arm/Kconfig2
-rw-r--r--arch/arm/include/asm/pgtable-2level.h32
-rw-r--r--arch/arm/include/asm/pgtable-3level.h1
-rw-r--r--arch/arm/include/asm/pgtable.h2
-rw-r--r--arch/arm/include/asm/tlb.h3
5 files changed, 37 insertions, 3 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5e80fadec0b..f5d4354d9b8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1836,7 +1836,7 @@ 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
diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
index 323e19f3ec4..bc1a7b8ecb6 100644
--- a/arch/arm/include/asm/pgtable-2level.h
+++ b/arch/arm/include/asm/pgtable-2level.h
@@ -212,6 +212,7 @@ 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; }
@@ -232,6 +233,16 @@ 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_thp_or_huge(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);
@@ -239,6 +250,8 @@ 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(mkyoung, |= PMD_DSECT_AF);
+PMD_BIT_FUNC(mkold, &= ~PMD_DSECT_AF);
+PMD_BIT_FUNC(mksplitting, |= PMD_DSECT_SPLITTING);
#define pmd_young(pmd) (pmd_val(pmd) & PMD_DSECT_AF)
#define pmd_write(pmd) (pmd_val(pmd) & PMD_SECT_AP_WRITE)
@@ -279,6 +292,25 @@ 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 */
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index a4b71c10453..82c61d6a6dd 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -214,6 +214,7 @@ 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_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
+#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))
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 576511f2d59..95f190938ca 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -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)
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index b2498e6664d..77037d99812 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -218,6 +218,9 @@ static inline void
tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
{
tlb_add_flush(tlb, addr);
+#ifndef CONFIG_ARM_LPAE
+ tlb_add_flush(tlb, addr + SZ_1M);
+#endif
}
#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)