diff options
author | Steve Capper <steve.capper@arm.com> | 2012-07-19 12:00:10 +0100 |
---|---|---|
committer | Tushar Behera <tushar.behera@linaro.org> | 2013-01-22 11:41:45 +0530 |
commit | 54e3cf7370f83e0749de2ffc90ad5524615e4b2a (patch) | |
tree | a55aff7c48d258ea8631d0372d64990c6c3ea563 | |
parent | 6b6dcfc68f777d34c6197b7881cae5bc78a05b80 (diff) | |
download | linux-topics-54e3cf7370f83e0749de2ffc90ad5524615e4b2a.tar.gz |
ARM: mm: Transparent huge page support for non-LPAE systems.
Much of the required code for THP has been implemented in the earlier non-LPAE
HugeTLB patch.
One more domain bits 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: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steve Capper <steve.capper@arm.com>
-rw-r--r-- | arch/arm/Kconfig | 2 | ||||
-rw-r--r-- | arch/arm/include/asm/pgtable-2level.h | 68 | ||||
-rw-r--r-- | arch/arm/include/asm/pgtable-3level.h | 2 | ||||
-rw-r--r-- | arch/arm/include/asm/pgtable.h | 7 |
4 files changed, 75 insertions, 4 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index d3b2ec39386..dd88fda3ae2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1885,7 +1885,7 @@ config SYS_SUPPORTS_HUGETLBFS config HAVE_ARCH_TRANSPARENT_HUGEPAGE def_bool y - depends on ARM_LPAE + depends on SYS_SUPPORTS_HUGETLBFS source "mm/Kconfig" diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index 3acd1abd2e7..eb1640ed2a5 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -181,6 +181,13 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) clean_pmd_entry(pmdp); \ } while (0) + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define _PMD_HUGE(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) +#else +#define _PMD_HUGE(pmd) (0) +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + /* we don't need complex calculations here as the pmd is folded into the pgd */ #define pmd_addr_end(addr,end) (end) @@ -199,7 +206,6 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) #define HPAGE_SHIFT PMD_SHIFT #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) -#define HPAGE_MASK (~(HPAGE_SIZE - 1)) #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) #define HUGE_LINUX_PTE_COUNT (PAGE_OFFSET >> HPAGE_SHIFT) @@ -211,6 +217,7 @@ 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; } @@ -263,8 +270,67 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) return __pmd(pmdval); } +#else +#define HPAGE_SIZE 0 #endif /* CONFIG_SYS_SUPPORTS_HUGETLBFS */ +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_mkhuge(pmd) (__pmd((pmd_val(pmd) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT)) + +PMD_BIT_FUNC(mkold, &= ~PMD_DSECT_AF); +PMD_BIT_FUNC(mksplitting, |= PMD_DSECT_SPLITTING); +PMD_BIT_FUNC(mkdirty, |= PMD_DSECT_DIRTY); +PMD_BIT_FUNC(mkyoung, |= PMD_DSECT_AF); +PMD_BIT_FUNC(mkwrite, |= PMD_SECT_AP_WRITE); +PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); + +#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_DSECT_SPLITTING) +#define pmd_young(pmd) (pmd_val(pmd) & PMD_DSECT_AF) +#define pmd_write(pmd) (pmd_val(pmd) & PMD_SECT_AP_WRITE) +#define pmd_trans_huge(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) + +static inline unsigned long pmd_pfn(pmd_t pmd) +{ + /* + * for a section, we need to mask off more of the pmd + * before looking up the pfn + */ + if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) + return __phys_to_pfn(pmd_val(pmd) & HPAGE_MASK); + else + return __phys_to_pfn(pmd_val(pmd) & PHYS_MASK); +} + +static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot) +{ + pmd_t pmd = __pmd(__pfn_to_phys(pfn) | PMD_SECT_AP_READ | PMD_SECT_nG); + + return pmd_modify(pmd, prot); +} + +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot); + +static inline int has_transparent_hugepage(void) +{ + return 1; +} + +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + +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. + */ + if (_PMD_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 ddb0a248ba7..3c2432fe5e6 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -199,6 +199,8 @@ PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) +#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) + static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) { const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | PMD_SECT_RDONLY; diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 7a97521ef37..529ceae8d98 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -169,11 +169,14 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; static inline pte_t *pmd_page_vaddr(pmd_t pmd) { +#ifdef SYS_SUPPORTS_HUGETLBFS + if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) + return __va(pmd_val(pmd) & HPAGE_MASK); +#endif + 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) |