forked from Minki/linux
powerpc/mm: Introduce _PAGE_LARGE software pte bits
This patch adds a new software defined pte bit. We use the reserved fields of ISA 3.0 pte definition since we will only be using this on DD1 code paths. We can possibly look at removing this code later. The software bit will be used to differentiate between 64K/4K and 2M ptes. This helps in finding the page size mapping by a pte so that we can do efficient tlb flush. We don't support 1G hugetlb pages yet. So we add a DEBUG WARN_ON to catch wrong usage. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -30,4 +30,24 @@ static inline int hstate_get_psize(struct hstate *hstate)
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return mmu_virtual_psize;
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}
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}
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#define arch_make_huge_pte arch_make_huge_pte
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static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
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struct page *page, int writable)
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{
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unsigned long page_shift;
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if (!cpu_has_feature(CPU_FTR_POWER9_DD1))
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return entry;
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page_shift = huge_page_shift(hstate_vma(vma));
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/*
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* We don't support 1G hugetlb pages yet.
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*/
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VM_WARN_ON(page_shift == mmu_psize_defs[MMU_PAGE_1G].shift);
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if (page_shift == mmu_psize_defs[MMU_PAGE_2M].shift)
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return __pte(pte_val(entry) | _PAGE_LARGE);
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else
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return entry;
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}
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#endif
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@ -26,6 +26,11 @@
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#define _RPAGE_SW1 0x00800
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#define _RPAGE_SW2 0x00400
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#define _RPAGE_SW3 0x00200
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#define _RPAGE_RSV1 0x1000000000000000UL
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#define _RPAGE_RSV2 0x0800000000000000UL
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#define _RPAGE_RSV3 0x0400000000000000UL
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#define _RPAGE_RSV4 0x0200000000000000UL
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#ifdef CONFIG_MEM_SOFT_DIRTY
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#define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */
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#else
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@ -33,6 +38,11 @@
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#endif
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#define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */
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/*
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* For P9 DD1 only, we need to track whether the pte's huge.
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*/
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#define _PAGE_LARGE _RPAGE_RSV1
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#define _PAGE_PTE (1ul << 62) /* distinguishes PTEs from pointers */
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#define _PAGE_PRESENT (1ul << 63) /* pte contains a translation */
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@ -243,6 +243,8 @@ static inline int radix__pmd_trans_huge(pmd_t pmd)
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static inline pmd_t radix__pmd_mkhuge(pmd_t pmd)
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{
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if (cpu_has_feature(CPU_FTR_POWER9_DD1))
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return __pmd(pmd_val(pmd) | _PAGE_PTE | _PAGE_LARGE);
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return __pmd(pmd_val(pmd) | _PAGE_PTE);
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}
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static inline void radix__pmdp_huge_split_prepare(struct vm_area_struct *vma,
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